Refactored doc generation, add fi fileIndex alias

Fixed updating yaml from other files
update issue template, instruct questions to be raised in disussion
2025-01-18 04:53:17 -08:00 · 2021-01-02 10:49:33 +11:00 · 2021-01-02 10:27:32 +11:00 · 2020-12-31 13:43:44 +11:00 · 2020-12-31 09:33:15 +11:00 · 2020-12-31 09:30:59 +11:00
160 changed files with 1954 additions and 6588 deletions
--- a/.dockerignore
+++ b/.dockerignore
@ -1 +1 @@
-bin/*
+bin
--- a/.github/FUNDING.yml
+++ b/.github/FUNDING.yml
@ -1 +0,0 @@
-github: mikefarah
--- a/.github/workflows/release.yml
+++ b/.github/workflows/release.yml
@ -40,7 +40,17 @@ jobs:
      IMAGE_NAME: mikefarah/yq
    runs-on: ubuntu-latest
    steps:
-      - uses: actions/checkout@v2
+      - name: Get latest release tag      
+        uses: oprypin/find-latest-tag@v1
+        with:
+          repository: mikefarah/yq  # The repository to scan.
+          releases-only: true  # We know that all relevant tags have a GitHub release for them.
+        id: yq  
+        
+      - name: Clone source code
+        uses: actions/checkout@v2
+        with:
+          ref: ${{ steps.yq.outputs.tag }}
      
      - name: Set up QEMU
        uses: docker/setup-qemu-action@v1
--- a/Dockerfile.dev
+++ b/Dockerfile.dev
@ -6,5 +6,26 @@ RUN set -e -x \
    && /opt/devtools.sh
 ENV PATH=/go/bin:$PATH

+# install mkdocs
+RUN set -ex \
+    && buildDeps=' \
+        build-essential \
+        python3-dev \
+    ' \
+    && apt-get update && apt-get install -y --no-install-recommends \
+        $buildDeps \
+        python3 \
+        python3-setuptools \
+        python3-wheel \
+        python3-pip \
+    && pip3 install --upgrade \
+        pip \
+        'Markdown>=2.6.9' \
+        'mkdocs>=0.16.3' \
+        'mkdocs-material>=1.10.1' \
+        'markdown-include>=0.5.1' \
+    && apt-get purge -y --auto-remove $buildDeps \
+    && rm -rf /var/lib/apt/lists/*
+
 ENV CGO_ENABLED 0
 ENV GOPATH /go:/yq
--- a/10
+++ b/10
@ -17,7 +17,6 @@ help:
 	@echo '    make vendor          Install dependencies to vendor directory.'
 	@echo '    make format          Run code formatter.'
 	@echo '    make check           Run static code analysis (lint).'
-	@echo '    make secure          Run gosec.'
 	@echo '    make test            Run tests on project.'
 	@echo '    make cover           Run tests and capture code coverage metrics on project.'
 	@echo '    make clean           Clean the directory tree of produced artifacts.'
@ -85,10 +84,6 @@ format: vendor
 check: format
 	${DOCKRUN} bash ./scripts/check.sh

-.PHONY: secure
-secure: 
-	${DOCKRUN} bash ./scripts/secure.sh
-
 .PHONY: test
 test: check
 	${DOCKRUN} bash ./scripts/test.sh
@ -101,6 +96,11 @@ cover: check
 	@find cover -type d -exec chmod 755 {} \; || :
 	@find cover -type f -exec chmod 644 {} \; || :

+.PHONY: build-docs
+build-docs: prepare mkdocs.yml mkdocs/*
+	${DOCKRUN} mkdocs build
+	@find docs -type d -exec chmod 755 {} \; || :
+	@find docs -type f -exec chmod 644 {} \; || :

 .PHONY: release
 release: xcompile
--- a/README.md
+++ b/README.md
@ -12,8 +12,6 @@ V4 is now officially released, it's quite different from V3 (sorry for the migra

 If you've been using v3 and want/need to upgrade, checkout the [upgrade guide](https://mikefarah.gitbook.io/yq/v/v4.x/upgrading-from-v3).

-Support for v3 will cease August 2021, until then, critical bug and security fixes will still get applied if required.
-
 ## Install

 ### [Download the latest binary](https://github.com/mikefarah/yq/releases/latest)
@ -42,25 +40,11 @@ Using [Homebrew](https://brew.sh/)
 brew install yq
 ```

-or, for the (deprecated) v3 version:
-
-```
-brew install yq@3
-```
-
-Note that for v3, as it is a versioned brew it will not add the `yq` command to your path automatically. Please follow the instructions given by brew upon installation.
-
 ### Linux via snap:
 ```
 snap install yq
 ```

-or, for the (deprecated) v3 version:
-
-```
-snap install yq --channel=v3/stable
-```
-
 #### Snap notes
 `yq` installs with [_strict confinement_](https://docs.snapcraft.io/snap-confinement/6233) in snap, this means it doesn't have direct access to root files. To read root files you can:

@ -90,7 +74,7 @@ docker run --rm -v "${PWD}":/workdir mikefarah/yq <command> [flags] [expression
 #### Run commands interactively:

 ```bash
-docker run --rm -it -v "${PWD}":/workdir --entrypoint sh mikefarah/yq
+docker run --rm -it -v "${PWD}":/workdir mikefarah/yq sh
 ```

 It can be useful to have a bash function to avoid typing the whole docker command:
@ -103,24 +87,14 @@ yq() {

 ### Go Get:
 ```
-GO111MODULE=on go get github.com/mikefarah/yq/v4
+GO111MODULE=on go get github.com/mikefarah/yq
 ```

 ## Community Supported Installation methods
 As these are supported by the community :heart: - however, they may be out of date with the officially supported releases.

-# Webi
-
-```
-webi yq
-```
-
-See [webi](https://webinstall.dev/)
-Supported by @adithyasunil26 (https://github.com/webinstall/webi-installers/tree/master/yq)

 ### Windows:
-[![Chocolatey](https://img.shields.io/chocolatey/v/yq.svg)](https://chocolatey.org/packages/yq)
-[![Chocolatey](https://img.shields.io/chocolatey/dt/yq.svg)](https://chocolatey.org/packages/yq)
 ```
 choco install yq
 ```
@ -153,21 +127,19 @@ sudo apt install yq -y
 Supported by @rmescandon (https://launchpad.net/~rmescandon/+archive/ubuntu/yq)

 ## Features
- [Detailed documentation with many examples](https://mikefarah.gitbook.io/yq/)
 - Written in portable go, so you can download a lovely dependency free binary
 - Uses similar syntax as `jq` but works with YAML and JSON files
 - Fully supports multi document yaml files
 - Colorized yaml output
- [Deeply traverse yaml](https://mikefarah.gitbook.io/yq/operators/traverse-read)
- [Sort yaml by keys](https://mikefarah.gitbook.io/yq/operators/sort-keys)
- Manipulate yaml [comments](https://mikefarah.gitbook.io/yq/operators/comment-operators), [styling](https://mikefarah.gitbook.io/yq/operators/style), [tags](https://mikefarah.gitbook.io/yq/operators/tag) and [anchors and aliases](https://mikefarah.gitbook.io/yq/operators/anchor-and-alias-operators).
+- [Deeply traverse yaml](https://mikefarah.gitbook.io/yq/v/v4.x/traverse)
+- [Sort yaml by keys](https://mikefarah.gitbook.io/yq/v/v4.x/sort-keys)
+- Manipulate yaml [comments](https://mikefarah.gitbook.io/yq/comment-operators), [styling](https://mikefarah.gitbook.io/yq/style), [tags](https://mikefarah.gitbook.io/yq/tag) and [anchors and aliases](https://mikefarah.gitbook.io/yq/anchor-and-alias-operators).
 - [Update yaml inplace](https://mikefarah.gitbook.io/yq/v/v4.x/commands/evaluate#flags)
- [Complex expressions to select and update](https://mikefarah.gitbook.io/yq/operators/select#select-and-update-matching-values-in-map)
+- [Complex expressions to select and update](https://mikefarah.gitbook.io/yq/v/v4.x/select#select-and-update-matching-values-in-map)
 - Keeps yaml formatting and comments when updating (though there are issues with whitespace)
 - [Convert to/from json to yaml](https://mikefarah.gitbook.io/yq/v/v4.x/usage/convert)
 - [Pipe data in by using '-'](https://mikefarah.gitbook.io/yq/v/v4.x/commands/evaluate)
 - [General shell completion scripts (bash/zsh/fish/powershell)](https://mikefarah.gitbook.io/yq/v/v4.x/commands/shell-completion)
- [Reduce](https://mikefarah.gitbook.io/yq/operators/reduce) to merge multiple files or sum an array or other fancy things.

 ## [Usage](https://mikefarah.gitbook.io/yq/)

--- a/cmd/evaluate_all_command.go
+++ b/cmd/evaluate_all_command.go
@ -17,9 +17,6 @@ func createEvaluateAllCommand() *cobra.Command {
 		Example: `
 # merges f2.yml into f1.yml (inplace)
 yq eval-all --inplace 'select(fileIndex == 0) * select(fileIndex == 1)' f1.yml f2.yml		
-
-# use '-' as a filename to read from STDIN
-cat file2.yml | yq ea '.a.b' file1.yml - file3.yml
 `,
 		Long: "Evaluate All:\nUseful when you need to run an expression across several yaml documents or files. Consumes more memory than eval",
 		RunE: evaluateAll,
@ -45,21 +42,14 @@ func evaluateAll(cmd *cobra.Command, args []string) error {
 		colorsEnabled = true
 	}

-	firstFileIndex := -1
-	if !nullInput && len(args) == 1 {
-		firstFileIndex = 0
-	} else if len(args) > 1 {
-		firstFileIndex = 1
-	}
-
-	if writeInplace && (firstFileIndex == -1) {
+	if writeInplace && len(args) < 2 {
 		return fmt.Errorf("Write inplace flag only applicable when giving an expression and at least one file")
 	}

 	if writeInplace {
 		// only use colors if its forced
 		colorsEnabled = forceColor
-		writeInPlaceHandler := yqlib.NewWriteInPlaceHandler(args[firstFileIndex])
+		writeInPlaceHandler := yqlib.NewWriteInPlaceHandler(args[1])
 		out, err = writeInPlaceHandler.CreateTempFile()
 		if err != nil {
 			return err
@ -69,10 +59,6 @@ func evaluateAll(cmd *cobra.Command, args []string) error {
 		defer func() { writeInPlaceHandler.FinishWriteInPlace(completedSuccessfully) }()
 	}

-	if nullInput && len(args) > 1 {
-		return errors.New("Cannot pass files in when using null-input flag")
-	}
-
 	printer := yqlib.NewPrinter(out, outputToJSON, unwrapScalar, colorsEnabled, indent, !noDocSeparators)

 	allAtOnceEvaluator := yqlib.NewAllAtOnceEvaluator()
--- a/cmd/evalute_sequence_command.go
+++ b/cmd/evalute_sequence_command.go
@ -21,9 +21,6 @@ yq e '.a.b | length' f1.yml f2.yml
 # prints out the file
 yq e sample.yaml 

-# use '-' as a filename to read from STDIN
-cat file2.yml | yq e '.a.b' file1.yml - file3.yml
-
 # prints a new yaml document
 yq e -n '.a.b.c = "cat"' 

@ -65,21 +62,14 @@ func evaluateSequence(cmd *cobra.Command, args []string) error {
 		colorsEnabled = true
 	}

-	firstFileIndex := -1
-	if !nullInput && len(args) == 1 {
-		firstFileIndex = 0
-	} else if len(args) > 1 {
-		firstFileIndex = 1
-	}
-
-	if writeInplace && (firstFileIndex == -1) {
+	if writeInplace && len(args) < 2 {
 		return fmt.Errorf("Write inplace flag only applicable when giving an expression and at least one file")
 	}

 	if writeInplace {
 		// only use colors if its forced
 		colorsEnabled = forceColor
-		writeInPlaceHandler := yqlib.NewWriteInPlaceHandler(args[firstFileIndex])
+		writeInPlaceHandler := yqlib.NewWriteInPlaceHandler(args[1])
 		out, err = writeInPlaceHandler.CreateTempFile()
 		if err != nil {
 			return err
@ -93,10 +83,6 @@ func evaluateSequence(cmd *cobra.Command, args []string) error {

 	streamEvaluator := yqlib.NewStreamEvaluator()

-	if nullInput && len(args) > 1 {
-		return errors.New("Cannot pass files in when using null-input flag")
-	}
-
 	switch len(args) {
 	case 0:
 		if pipingStdIn {
@ -112,7 +98,7 @@ func evaluateSequence(cmd *cobra.Command, args []string) error {
 			err = streamEvaluator.EvaluateFiles(processExpression(""), []string{args[0]}, printer)
 		}
 	default:
-		err = streamEvaluator.EvaluateFiles(processExpression(args[0]), args[1:], printer)
+		err = streamEvaluator.EvaluateFiles(args[0], args[1:], printer)
 	}
 	completedSuccessfully = err == nil

--- a/cmd/version.go
+++ b/cmd/version.go
@ -11,7 +11,7 @@ var (
 	GitDescribe string

 	// Version is main version number that is being run at the moment.
-	Version = "4.9.3"
+	Version = "4.2.1"

 	// VersionPrerelease is a pre-release marker for the version. If this is "" (empty string)
 	// then it means that it is a final release. Otherwise, this is a pre-release
--- a/examples/data1.yaml
+++ b/examples/data1.yaml
@ -1,6 +1,4 @@
-a:
-  key1: "value1"
-  key2: 2.6
-  ab:
-    key1: 6
-    key2: "h"
+a: simple # just the best
+b: [1, 2]
+c:
+  test: 1
--- a/github-action/Dockerfile
+++ b/github-action/Dockerfile
@ -1,4 +1,4 @@
-FROM mikefarah/yq:4.9.3
+FROM mikefarah/yq:4.2.1

 COPY entrypoint.sh /entrypoint.sh

--- a/go.mod
+++ b/go.mod
@ -1,16 +1,18 @@
 module github.com/mikefarah/yq/v4

 require (
-	github.com/elliotchance/orderedmap v1.4.0
-	github.com/fatih/color v1.10.0
-	github.com/goccy/go-yaml v1.8.9
-	github.com/jinzhu/copier v0.2.8
-	github.com/spf13/cobra v1.1.3
+	github.com/elliotchance/orderedmap v1.3.0
+	github.com/fatih/color v1.9.0
+	github.com/goccy/go-yaml v1.8.1
+	github.com/jinzhu/copier v0.0.0-20190924061706-b57f9002281a
+	github.com/mattn/go-colorable v0.1.7 // indirect
+	github.com/spf13/cobra v1.1.1
 	github.com/timtadh/data-structures v0.5.3 // indirect
 	github.com/timtadh/lexmachine v0.2.2
-	golang.org/x/sys v0.0.0-20210317225723-c4fcb01b228e // indirect
+	golang.org/x/sys v0.0.0-20200930185726-fdedc70b468f // indirect
+	golang.org/x/xerrors v0.0.0-20200804184101-5ec99f83aff1 // indirect
 	gopkg.in/op/go-logging.v1 v1.0.0-20160211212156-b2cb9fa56473
-	gopkg.in/yaml.v3 v3.0.0-20210107192922-496545a6307b
+	gopkg.in/yaml.v3 v3.0.0-20200615113413-eeeca48fe776
 )

 go 1.15
--- a/go.sum
+++ b/go.sum
@ -36,24 +36,22 @@ github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c
 github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
 github.com/dgrijalva/jwt-go v3.2.0+incompatible/go.mod h1:E3ru+11k8xSBh+hMPgOLZmtrrCbhqsmaPHjLKYnJCaQ=
 github.com/dgryski/go-sip13 v0.0.0-20181026042036-e10d5fee7954/go.mod h1:vAd38F8PWV+bWy6jNmig1y/TA+kYO4g3RSRF0IAv0no=
-github.com/elliotchance/orderedmap v1.4.0 h1:wZtfeEONCbx6in1CZyE6bELEt/vFayMvsxqI5SgsR+A=
-github.com/elliotchance/orderedmap v1.4.0/go.mod h1:wsDwEaX5jEoyhbs7x93zk2H/qv0zwuhg4inXhDkYqys=
+github.com/elliotchance/orderedmap v1.3.0 h1:k6m77/d0zCXTjsk12nX40TkEBkSICq8T4s6R6bpCqU0=
+github.com/elliotchance/orderedmap v1.3.0/go.mod h1:8hdSl6jmveQw8ScByd3AaNHNk51RhbTazdqtTty+NFw=
 github.com/fatih/color v1.7.0/go.mod h1:Zm6kSWBoL9eyXnKyktHP6abPY2pDugNf5KwzbycvMj4=
-github.com/fatih/color v1.10.0 h1:s36xzo75JdqLaaWoiEHk767eHiwo0598uUxyfiPkDsg=
-github.com/fatih/color v1.10.0/go.mod h1:ELkj/draVOlAH/xkhN6mQ50Qd0MPOk5AAr3maGEBuJM=
+github.com/fatih/color v1.9.0 h1:8xPHl4/q1VyqGIPif1F+1V3Y3lSmrq01EabUW3CoW5s=
+github.com/fatih/color v1.9.0/go.mod h1:eQcE1qtQxscV5RaZvpXrrb8Drkc3/DdQ+uUYCNjL+zU=
 github.com/fsnotify/fsnotify v1.4.7/go.mod h1:jwhsz4b93w/PPRr/qN1Yymfu8t87LnFCMoQvtojpjFo=
 github.com/ghodss/yaml v1.0.0/go.mod h1:4dBDuWmgqj2HViK6kFavaiC9ZROes6MMH2rRYeMEF04=
 github.com/go-gl/glfw v0.0.0-20190409004039-e6da0acd62b1/go.mod h1:vR7hzQXu2zJy9AVAgeJqvqgH9Q5CA+iKCZ2gyEVpxRU=
 github.com/go-kit/kit v0.8.0/go.mod h1:xBxKIO96dXMWWy0MnWVtmwkA9/13aqxPnvrjFYMA2as=
 github.com/go-logfmt/logfmt v0.3.0/go.mod h1:Qt1PoO58o5twSAckw1HlFXLmHsOX5/0LbT9GBnD5lWE=
 github.com/go-logfmt/logfmt v0.4.0/go.mod h1:3RMwSq7FuexP4Kalkev3ejPJsZTpXXBr9+V4qmtdjCk=
-github.com/go-playground/assert/v2 v2.0.1/go.mod h1:VDjEfimB/XKnb+ZQfWdccd7VUvScMdVu0Titje2rxJ4=
 github.com/go-playground/locales v0.13.0/go.mod h1:taPMhCMXrRLJO55olJkUXHZBHCxTMfnGwq/HNwmWNS8=
 github.com/go-playground/universal-translator v0.17.0/go.mod h1:UkSxE5sNxxRwHyU+Scu5vgOQjsIJAF8j9muTVoKLVtA=
-github.com/go-playground/validator/v10 v10.4.1/go.mod h1:nlOn6nFhuKACm19sB/8EGNn9GlaMV7XkbRSipzJ0Ii4=
 github.com/go-stack/stack v1.8.0/go.mod h1:v0f6uXyyMGvRgIKkXu+yp6POWl0qKG85gN/melR3HDY=
-github.com/goccy/go-yaml v1.8.9 h1:4AEXg2qx+/w29jXnXpMY6mTckmYu1TMoHteKuMf0HFg=
-github.com/goccy/go-yaml v1.8.9/go.mod h1:U/jl18uSupI5rdI2jmuCswEA2htH9eXfferR3KfscvA=
+github.com/goccy/go-yaml v1.8.1 h1:JuZRFlqLM5cWF6A+waL8AKVuCcqvKOuhJtUQI+L3ez0=
+github.com/goccy/go-yaml v1.8.1/go.mod h1:wS4gNoLalDSJxo/SpngzPQ2BN4uuZVLCmbM4S3vd4+Y=
 github.com/gogo/protobuf v1.1.1/go.mod h1:r8qH/GZQm5c6nD/R0oafs1akxWv10x8SbQlK7atdtwQ=
 github.com/gogo/protobuf v1.2.1/go.mod h1:hp+jE20tsWTFYpLwKvXlhS1hjn+gTNwPg2I6zVXpSg4=
 github.com/golang/glog v0.0.0-20160126235308-23def4e6c14b/go.mod h1:SBH7ygxi8pfUlaOkMMuAQtPIUF8ecWP5IEl/CR7VP2Q=
@ -101,8 +99,8 @@ github.com/hashicorp/memberlist v0.1.3/go.mod h1:ajVTdAv/9Im8oMAAj5G31PhhMCZJV2p
 github.com/hashicorp/serf v0.8.2/go.mod h1:6hOLApaqBFA1NXqRQAsxw9QxuDEvNxSQRwA/JwenrHc=
 github.com/inconshreveable/mousetrap v1.0.0 h1:Z8tu5sraLXCXIcARxBp/8cbvlwVa7Z1NHg9XEKhtSvM=
 github.com/inconshreveable/mousetrap v1.0.0/go.mod h1:PxqpIevigyE2G7u3NXJIT2ANytuPF1OarO4DADm73n8=
-github.com/jinzhu/copier v0.2.8 h1:N8MbL5niMwE3P4dOwurJixz5rMkKfujmMRFmAanSzWE=
-github.com/jinzhu/copier v0.2.8/go.mod h1:24xnZezI2Yqac9J61UC6/dG/k76ttpq0DdJI3QmUvro=
+github.com/jinzhu/copier v0.0.0-20190924061706-b57f9002281a h1:zPPuIq2jAWWPTrGt70eK/BSch+gFAGrNzecsoENgu2o=
+github.com/jinzhu/copier v0.0.0-20190924061706-b57f9002281a/go.mod h1:yL958EeXv8Ylng6IfnvG4oflryUi3vgA3xPs9hmII1s=
 github.com/jonboulle/clockwork v0.1.0/go.mod h1:Ii8DK3G1RaLaWxj9trq07+26W01tbo22gdxWY5EU2bo=
 github.com/json-iterator/go v1.1.6/go.mod h1:+SdeFBvtyEkXs7REEP0seUULqWtbJapLOCVDaaPEHmU=
 github.com/jstemmer/go-junit-report v0.0.0-20190106144839-af01ea7f8024/go.mod h1:6v2b51hI/fHJwM22ozAgKL4VKDeJcHhJFhtBdhmNjmU=
@ -120,9 +118,15 @@ github.com/kr/text v0.1.0/go.mod h1:4Jbv+DJW3UT/LiOwJeYQe1efqtUx/iVham/4vfdArNI=
 github.com/leodido/go-urn v1.2.0/go.mod h1:+8+nEpDfqqsY+g338gtMEUOtuK+4dEMhiQEgxpxOKII=
 github.com/magiconair/properties v1.8.1/go.mod h1:PppfXfuXeibc/6YijjN8zIbojt8czPbwD3XqdrwzmxQ=
 github.com/mattn/go-colorable v0.0.9/go.mod h1:9vuHe8Xs5qXnSaW/c/ABM9alt+Vo+STaOChaDxuIBZU=
-github.com/mattn/go-colorable v0.1.8 h1:c1ghPdyEDarC70ftn0y+A/Ee++9zz8ljHG1b13eJ0s8=
-github.com/mattn/go-colorable v0.1.8/go.mod h1:u6P/XSegPjTcexA+o6vUJrdnUu04hMope9wVRipJSqc=
+github.com/mattn/go-colorable v0.1.4 h1:snbPLB8fVfU9iwbbo30TPtbLRzwWu6aJS6Xh4eaaviA=
+github.com/mattn/go-colorable v0.1.4/go.mod h1:U0ppj6V5qS13XJ6of8GYAs25YV2eR4EVcfRqFIhoBtE=
+github.com/mattn/go-colorable v0.1.7 h1:bQGKb3vps/j0E9GfJQ03JyhRuxsvdAanXlT9BTw3mdw=
+github.com/mattn/go-colorable v0.1.7/go.mod h1:u6P/XSegPjTcexA+o6vUJrdnUu04hMope9wVRipJSqc=
 github.com/mattn/go-isatty v0.0.3/go.mod h1:M+lRXTBqGeGNdLjl/ufCoiOlB5xdOkqRJdNxMWT7Zi4=
+github.com/mattn/go-isatty v0.0.8/go.mod h1:Iq45c/XA43vh69/j3iqttzPXn0bhXyGjM0Hdxcsrc5s=
+github.com/mattn/go-isatty v0.0.10/go.mod h1:qgIWMr58cqv1PHHyhnkY9lrL7etaEgOFcMEpPG5Rm84=
+github.com/mattn/go-isatty v0.0.11 h1:FxPOTFNqGkuDUGi3H/qkUbQO4ZiBa2brKq5r0l8TGeM=
+github.com/mattn/go-isatty v0.0.11/go.mod h1:PhnuNfih5lzO57/f3n+odYbM4JtupLOxQOAqxQCu2WE=
 github.com/mattn/go-isatty v0.0.12 h1:wuysRhFDzyxgEmMf5xjvJ2M9dZoWAXNNr5LSBS7uHXY=
 github.com/mattn/go-isatty v0.0.12/go.mod h1:cbi8OIDigv2wuxKPP5vlRcQ1OAZbq2CE4Kysco4FUpU=
 github.com/matttproud/golang_protobuf_extensions v1.0.1/go.mod h1:D8He9yQNgCq6Z5Ld7szi9bcBfOoFv/3dc6xSMkL2PC0=
@ -168,9 +172,10 @@ github.com/soheilhy/cmux v0.1.4/go.mod h1:IM3LyeVVIOuxMH7sFAkER9+bJ4dT7Ms6E4xg4k
 github.com/spaolacci/murmur3 v0.0.0-20180118202830-f09979ecbc72/go.mod h1:JwIasOWyU6f++ZhiEuf87xNszmSA2myDM2Kzu9HwQUA=
 github.com/spf13/afero v1.1.2/go.mod h1:j4pytiNVoe2o6bmDsKpLACNPDBIoEAkihy7loJ1B0CQ=
 github.com/spf13/cast v1.3.0/go.mod h1:Qx5cxh0v+4UWYiBimWS+eyWzqEqokIECu5etghLkUJE=
-github.com/spf13/cobra v1.1.3 h1:xghbfqPkxzxP3C/f3n5DdpAbdKLj4ZE4BWQI362l53M=
-github.com/spf13/cobra v1.1.3/go.mod h1:pGADOWyqRD/YMrPZigI/zbliZ2wVD/23d+is3pSWzOo=
+github.com/spf13/cobra v1.1.1 h1:KfztREH0tPxJJ+geloSLaAkaPkr4ki2Er5quFV1TDo4=
+github.com/spf13/cobra v1.1.1/go.mod h1:WnodtKOvamDL/PwE2M4iKs8aMDBZ5Q5klgD3qfVJQMI=
 github.com/spf13/jwalterweatherman v1.0.0/go.mod h1:cQK4TGJAtQXfYWX+Ddv3mKDzgVb68N+wFjFa4jdeBTo=
+github.com/spf13/pflag v1.0.3 h1:zPAT6CGy6wXeQ7NtTnaTerfKOsV6V6F8agHXFiazDkg=
 github.com/spf13/pflag v1.0.3/go.mod h1:DYY7MBk1bdzusC3SYhjObp+wFpr4gzcvqqNjLnInEg4=
 github.com/spf13/pflag v1.0.5 h1:iy+VFUOCP1a+8yFto/drg2CJ5u0yRoB7fZw3DKv/JXA=
 github.com/spf13/pflag v1.0.5/go.mod h1:McXfInJRrz4CZXVZOBLb0bTZqETkiAhM9Iw0y3An2Bg=
@ -179,9 +184,8 @@ github.com/stretchr/objx v0.1.0/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+
 github.com/stretchr/objx v0.1.1/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+wExME=
 github.com/stretchr/testify v1.2.2/go.mod h1:a8OnRcib4nhh0OaRAV+Yts87kKdq0PP7pXfy6kDkUVs=
 github.com/stretchr/testify v1.3.0/go.mod h1:M5WIy9Dh21IEIfnGCwXGc5bZfKNJtfHm1UVUgZn+9EI=
+github.com/stretchr/testify v1.4.0 h1:2E4SXV/wtOkTonXsotYi4li6zVWxYlZuYNCXe9XRJyk=
 github.com/stretchr/testify v1.4.0/go.mod h1:j7eGeouHqKxXV5pUuKE4zz7dFj8WfuZ+81PSLYec5m4=
-github.com/stretchr/testify v1.7.0 h1:nwc3DEeHmmLAfoZucVR881uASk0Mfjw8xYJ99tb5CcY=
-github.com/stretchr/testify v1.7.0/go.mod h1:6Fq8oRcR53rry900zMqJjRRixrwX3KX962/h/Wwjteg=
 github.com/subosito/gotenv v1.2.0/go.mod h1:N0PQaV/YGNqwC0u51sEeR/aUtSLEXKX9iv69rRypqCw=
 github.com/timtadh/data-structures v0.5.3 h1:F2tEjoG9qWIyUjbvXVgJqEOGJPMIiYn7U5W5mE+i/vQ=
 github.com/timtadh/data-structures v0.5.3/go.mod h1:9R4XODhJ8JdWFEI8P/HJKqxuJctfBQw6fDibMQny2oU=
@ -200,7 +204,6 @@ golang.org/x/crypto v0.0.0-20181029021203-45a5f77698d3/go.mod h1:6SG95UA2DQfeDnf
 golang.org/x/crypto v0.0.0-20190308221718-c2843e01d9a2/go.mod h1:djNgcEr1/C05ACkg1iLfiJU5Ep61QUkGW8qpdssI0+w=
 golang.org/x/crypto v0.0.0-20190510104115-cbcb75029529/go.mod h1:yigFU9vqHzYiE8UmvKecakEJjdnWj3jj499lnFckfCI=
 golang.org/x/crypto v0.0.0-20190605123033-f99c8df09eb5/go.mod h1:yigFU9vqHzYiE8UmvKecakEJjdnWj3jj499lnFckfCI=
-golang.org/x/crypto v0.0.0-20200622213623-75b288015ac9/go.mod h1:LzIPMQfyMNhhGPhUkYOs5KpL4U8rLKemX1yGLhDgUto=
 golang.org/x/exp v0.0.0-20190121172915-509febef88a4/go.mod h1:CJ0aWSM057203Lf6IL+f9T1iT9GByDxfZKAQTCR3kQA=
 golang.org/x/exp v0.0.0-20190306152737-a1d7652674e8/go.mod h1:CJ0aWSM057203Lf6IL+f9T1iT9GByDxfZKAQTCR3kQA=
 golang.org/x/exp v0.0.0-20190510132918-efd6b22b2522/go.mod h1:ZjyILWgesfNpC6sMxTJOJm9Kp84zZh5NQWvqDGG3Qr8=
@ -248,16 +251,22 @@ golang.org/x/sys v0.0.0-20181026203630-95b1ffbd15a5/go.mod h1:STP8DvDyc/dI5b8T5h
 golang.org/x/sys v0.0.0-20181107165924-66b7b1311ac8/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
 golang.org/x/sys v0.0.0-20181116152217-5ac8a444bdc5/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
 golang.org/x/sys v0.0.0-20190215142949-d0b11bdaac8a/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
+golang.org/x/sys v0.0.0-20190222072716-a9d3bda3a223/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
 golang.org/x/sys v0.0.0-20190312061237-fead79001313/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/sys v0.0.0-20190412213103-97732733099d/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/sys v0.0.0-20190502145724-3ef323f4f1fd/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/sys v0.0.0-20190507160741-ecd444e8653b/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/sys v0.0.0-20190606165138-5da285871e9c/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/sys v0.0.0-20190624142023-c5567b49c5d0/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
+golang.org/x/sys v0.0.0-20191008105621-543471e840be/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
+golang.org/x/sys v0.0.0-20191010194322-b09406accb47/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
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 golang.org/x/sys v0.0.0-20200116001909-b77594299b42/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
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 golang.org/x/sys v0.0.0-20200223170610-d5e6a3e2c0ae/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
-golang.org/x/sys v0.0.0-20210317225723-c4fcb01b228e h1:XNp2Flc/1eWQGk5BLzqTAN7fQIwIbfyVTuVxXxZh73M=
-golang.org/x/sys v0.0.0-20210317225723-c4fcb01b228e/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
+golang.org/x/sys v0.0.0-20200930185726-fdedc70b468f h1:+Nyd8tzPX9R7BWHguqsrbFdRx3WQ/1ib8I44HXV5yTA=
+golang.org/x/sys v0.0.0-20200930185726-fdedc70b468f/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/text v0.3.0/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=
 golang.org/x/text v0.3.1-0.20180807135948-17ff2d5776d2/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=
 golang.org/x/text v0.3.2/go.mod h1:bEr9sfX3Q8Zfm5fL9x+3itogRgK3+ptLWKqgva+5dAk=
@ -267,6 +276,7 @@ golang.org/x/tools v0.0.0-20180221164845-07fd8470d635/go.mod h1:n7NCudcB/nEzxVGm
 golang.org/x/tools v0.0.0-20180917221912-90fa682c2a6e/go.mod h1:n7NCudcB/nEzxVGmLbDWY5pfWTLqBcC2KZ6jyYvM4mQ=
 golang.org/x/tools v0.0.0-20190114222345-bf090417da8b/go.mod h1:n7NCudcB/nEzxVGmLbDWY5pfWTLqBcC2KZ6jyYvM4mQ=
 golang.org/x/tools v0.0.0-20190226205152-f727befe758c/go.mod h1:9Yl7xja0Znq3iFh3HoIrodX9oNMXvdceNzlUR8zjMvY=
+golang.org/x/tools v0.0.0-20190311212946-11955173bddd h1:/e+gpKk9r3dJobndpTytxS2gOy6m5uvpg+ISQoEcusQ=
 golang.org/x/tools v0.0.0-20190311212946-11955173bddd/go.mod h1:LCzVGOaR6xXOjkQ3onu1FJEFr0SW1gC7cKk1uF8kGRs=
 golang.org/x/tools v0.0.0-20190312151545-0bb0c0a6e846/go.mod h1:LCzVGOaR6xXOjkQ3onu1FJEFr0SW1gC7cKk1uF8kGRs=
 golang.org/x/tools v0.0.0-20190312170243-e65039ee4138/go.mod h1:LCzVGOaR6xXOjkQ3onu1FJEFr0SW1gC7cKk1uF8kGRs=
@ -281,6 +291,8 @@ golang.org/x/tools v0.0.0-20190911174233-4f2ddba30aff/go.mod h1:b+2E5dAYhXwXZwtn
 golang.org/x/tools v0.0.0-20191012152004-8de300cfc20a/go.mod h1:b+2E5dAYhXwXZwtnZ6UAqBI28+e2cm9otk0dWdXHAEo=
 golang.org/x/tools v0.0.0-20191112195655-aa38f8e97acc/go.mod h1:b+2E5dAYhXwXZwtnZ6UAqBI28+e2cm9otk0dWdXHAEo=
 golang.org/x/xerrors v0.0.0-20190717185122-a985d3407aa7/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
+golang.org/x/xerrors v0.0.0-20191011141410-1b5146add898 h1:/atklqdjdhuosWIl6AIbOeHJjicWYPqR9bpxqxYG2pA=
+golang.org/x/xerrors v0.0.0-20191011141410-1b5146add898/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
 golang.org/x/xerrors v0.0.0-20200804184101-5ec99f83aff1 h1:go1bK/D/BFZV2I8cIQd1NKEZ+0owSTG1fDTci4IqFcE=
 golang.org/x/xerrors v0.0.0-20200804184101-5ec99f83aff1/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
 google.golang.org/api v0.4.0/go.mod h1:8k5glujaEP+g9n7WNsDg8QP6cUVNI86fCNMcbazEtwE=
@ -305,22 +317,26 @@ google.golang.org/grpc v1.19.0/go.mod h1:mqu4LbDTu4XGKhr4mRzUsmM4RtVoemTSY81AxZi
 google.golang.org/grpc v1.20.1/go.mod h1:10oTOabMzJvdu6/UiuZezV6QK5dSlG84ov/aaiqXj38=
 google.golang.org/grpc v1.21.1/go.mod h1:oYelfM1adQP15Ek0mdvEgi9Df8B9CZIaU1084ijfRaM=
 gopkg.in/alecthomas/kingpin.v2 v2.2.6/go.mod h1:FMv+mEhP44yOT+4EoQTLFTRgOQ1FBLkstjWtayDeSgw=
+gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405 h1:yhCVgyC4o1eVCa2tZl7eS0r+SDo693bJlVdllGtEeKM=
 gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
 gopkg.in/check.v1 v1.0.0-20180628173108-788fd7840127 h1:qIbj1fsPNlZgppZ+VLlY7N33q108Sa+fhmuc+sWQYwY=
 gopkg.in/check.v1 v1.0.0-20180628173108-788fd7840127/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
 gopkg.in/errgo.v2 v2.1.0/go.mod h1:hNsd1EY+bozCKY1Ytp96fpM3vjJbqLJn88ws8XvfDNI=
+gopkg.in/go-playground/assert.v1 v1.2.1/go.mod h1:9RXL0bg/zibRAgZUYszZSwO/z8Y/a8bDuhia5mkpMnE=
+gopkg.in/go-playground/validator.v9 v9.30.0/go.mod h1:+c9/zcJMFNgbLvly1L1V+PpxWdVbfP1avr/N00E2vyQ=
 gopkg.in/ini.v1 v1.51.0/go.mod h1:pNLf8WUiyNEtQjuu5G5vTm06TEv9tsIgeAvK8hOrP4k=
 gopkg.in/op/go-logging.v1 v1.0.0-20160211212156-b2cb9fa56473 h1:6D+BvnJ/j6e222UW8s2qTSe3wGBtvo0MbVQG/c5k8RE=
 gopkg.in/op/go-logging.v1 v1.0.0-20160211212156-b2cb9fa56473/go.mod h1:N1eN2tsCx0Ydtgjl4cqmbRCsY4/+z4cYDeqwZTk6zog=
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 gopkg.in/yaml.v2 v2.2.2/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
 gopkg.in/yaml.v2 v2.2.4/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
-gopkg.in/yaml.v2 v2.4.0/go.mod h1:RDklbk79AGWmwhnvt/jBztapEOGDOx6ZbXqjP6csGnQ=
-gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
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 honnef.co/go/tools v0.0.0-20190106161140-3f1c8253044a/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4=
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--- a/pkg/yqlib/all_at_once_evaluator.go
+++ b/pkg/yqlib/all_at_once_evaluator.go
@ -1,54 +1,29 @@
 package yqlib

-import (
-	"container/list"
+import "container/list"

-	yaml "gopkg.in/yaml.v3"
-)
-
-// A yaml expression evaluator that runs the expression once against all files/nodes in memory.
+/**
+	Loads all yaml documents of all files given into memory, then runs the given expression once.
+**/
 type Evaluator interface {
 	EvaluateFiles(expression string, filenames []string, printer Printer) error
-
-	// EvaluateNodes takes an expression and one or more yaml nodes, returning a list of matching candidate nodes
-	EvaluateNodes(expression string, nodes ...*yaml.Node) (*list.List, error)
-
-	// EvaluateCandidateNodes takes an expression and list of candidate nodes, returning a list of matching candidate nodes
-	EvaluateCandidateNodes(expression string, inputCandidateNodes *list.List) (*list.List, error)
 }

 type allAtOnceEvaluator struct {
 	treeNavigator DataTreeNavigator
-	treeCreator   ExpressionParser
+	treeCreator   PathTreeCreator
 }

 func NewAllAtOnceEvaluator() Evaluator {
-	return &allAtOnceEvaluator{treeNavigator: NewDataTreeNavigator(), treeCreator: NewExpressionParser()}
-}
-
-func (e *allAtOnceEvaluator) EvaluateNodes(expression string, nodes ...*yaml.Node) (*list.List, error) {
-	inputCandidates := list.New()
-	for _, node := range nodes {
-		inputCandidates.PushBack(&CandidateNode{Node: node})
-	}
-	return e.EvaluateCandidateNodes(expression, inputCandidates)
-}
-
-func (e *allAtOnceEvaluator) EvaluateCandidateNodes(expression string, inputCandidates *list.List) (*list.List, error) {
-	node, err := e.treeCreator.ParseExpression(expression)
-	if err != nil {
-		return nil, err
-	}
-	context, err := e.treeNavigator.GetMatchingNodes(Context{MatchingNodes: inputCandidates}, node)
-	if err != nil {
-		return nil, err
-	}
-	return context.MatchingNodes, nil
+	return &allAtOnceEvaluator{treeNavigator: NewDataTreeNavigator(), treeCreator: NewPathTreeCreator()}
 }

 func (e *allAtOnceEvaluator) EvaluateFiles(expression string, filenames []string, printer Printer) error {
 	fileIndex := 0
-
+	node, err := treeCreator.ParsePath(expression)
+	if err != nil {
+		return err
+	}
 	var allDocuments *list.List = list.New()
 	for _, filename := range filenames {
 		reader, err := readStream(filename)
@ -62,7 +37,7 @@ func (e *allAtOnceEvaluator) EvaluateFiles(expression string, filenames []string
 		allDocuments.PushBackList(fileDocuments)
 		fileIndex = fileIndex + 1
 	}
-	matches, err := e.EvaluateCandidateNodes(expression, allDocuments)
+	matches, err := treeNavigator.GetMatchingNodes(allDocuments, node)
 	if err != nil {
 		return err
 	}
--- a/pkg/yqlib/all_at_once_evaluator_test.go
+++ b/pkg/yqlib/all_at_once_evaluator_test.go
@ -1,40 +0,0 @@
-package yqlib
-
-import (
-	"testing"
-
-	"github.com/mikefarah/yq/v4/test"
-)
-
-var evaluateNodesScenario = []expressionScenario{
-	{
-		document:   `a: hello`,
-		expression: `.a`,
-		expected: []string{
-			"D0, P[a], (!!str)::hello\n",
-		},
-	},
-	{
-		document:   `a: hello`,
-		expression: `.`,
-		expected: []string{
-			"D0, P[], (doc)::a: hello\n",
-		},
-	},
-	{
-		document:   `- a: "yes"`,
-		expression: `.[] | has("a")`,
-		expected: []string{
-			"D0, P[0], (!!bool)::true\n",
-		},
-	},
-}
-
-func TestAllAtOnceEvaluateNodes(t *testing.T) {
-	var evaluator = NewAllAtOnceEvaluator()
-	for _, tt := range evaluateNodesScenario {
-		node := test.ParseData(tt.document)
-		list, _ := evaluator.EvaluateNodes(tt.expression, &node)
-		test.AssertResultComplex(t, tt.expected, resultsToString(list))
-	}
-}
--- a/pkg/yqlib/candidate_node.go
+++ b/pkg/yqlib/candidate_node.go
@ -2,50 +2,26 @@ package yqlib

 import (
 	"fmt"
+	"strconv"
+	"strings"

 	"github.com/jinzhu/copier"
 	yaml "gopkg.in/yaml.v3"
 )

 type CandidateNode struct {
-	Node      *yaml.Node     // the actual node
-	Parent    *CandidateNode // parent node
-	Path      []interface{}  /// the path we took to get to this node
-	Document  uint           // the document index of this node
+	Node      *yaml.Node    // the actual node
+	Path      []interface{} /// the path we took to get to this node
+	Document  uint          // the document index of this node
 	Filename  string
 	FileIndex int
-	// when performing op against all nodes given, this will treat all the nodes as one
-	// (e.g. top level cross document merge). This property does not propegate to child nodes.
-	EvaluateTogether bool
-	IsMapKey         bool
 }

 func (n *CandidateNode) GetKey() string {
-	keyPrefix := ""
-	if n.IsMapKey {
-		keyPrefix = "key-"
-	}
-	return fmt.Sprintf("%v%v - %v", keyPrefix, n.Document, n.Path)
+	return fmt.Sprintf("%v - %v", n.Document, n.Path)
 }

-func (n *CandidateNode) CreateChild(path interface{}, node *yaml.Node) *CandidateNode {
-	return &CandidateNode{
-		Node:      node,
-		Path:      n.createChildPath(path),
-		Parent:    n,
-		Document:  n.Document,
-		Filename:  n.Filename,
-		FileIndex: n.FileIndex,
-	}
-}
-
-func (n *CandidateNode) createChildPath(path interface{}) []interface{} {
-	if path == nil {
-		newPath := make([]interface{}, len(n.Path))
-		copy(newPath, n.Path)
-		return newPath
-	}
-
+func (n *CandidateNode) CreateChildPath(path interface{}) []interface{} {
 	//don't use append as they may actually modify the path of the orignal node!
 	newPath := make([]interface{}, len(n.Path)+1)
 	copy(newPath, n.Path)
@ -68,10 +44,10 @@ func (n *CandidateNode) UpdateFrom(other *CandidateNode) {
 	n.UpdateAttributesFrom(other)
 	n.Node.Content = other.Node.Content
 	n.Node.Value = other.Node.Value
+	n.Node.Alias = other.Node.Alias
 }

 func (n *CandidateNode) UpdateAttributesFrom(other *CandidateNode) {
-	log.Debug("UpdateAttributesFrom: n: %v other: %v", n.GetKey(), other.GetKey())
 	if n.Node.Kind != other.Node.Kind {
 		// clear out the contents when switching to a different type
 		// e.g. map to array
@ -80,22 +56,56 @@ func (n *CandidateNode) UpdateAttributesFrom(other *CandidateNode) {
 	}
 	n.Node.Kind = other.Node.Kind
 	n.Node.Tag = other.Node.Tag
-	n.Node.Alias = other.Node.Alias
-	n.Node.Anchor = other.Node.Anchor

 	// merge will pickup the style of the new thing
 	// when autocreating nodes
 	if n.Node.Style == 0 {
 		n.Node.Style = other.Node.Style
 	}
-
-	if other.Node.FootComment != "" {
-		n.Node.FootComment = other.Node.FootComment
-	}
-	if other.Node.HeadComment != "" {
-		n.Node.HeadComment = other.Node.HeadComment
-	}
-	if other.Node.LineComment != "" {
-		n.Node.LineComment = other.Node.LineComment
-	}
+	n.Node.FootComment = n.Node.FootComment + other.Node.FootComment
+	n.Node.HeadComment = n.Node.HeadComment + other.Node.HeadComment
+	n.Node.LineComment = n.Node.LineComment + other.Node.LineComment
+}
+
+func (n *CandidateNode) PathStackToString() string {
+	return mergePathStackToString(n.Path)
+}
+
+func mergePathStackToString(pathStack []interface{}) string {
+	var sb strings.Builder
+	for index, path := range pathStack {
+		switch path.(type) {
+		case int, int64:
+			// if arrayMergeStrategy == AppendArrayMergeStrategy {
+			// sb.WriteString("[+]")
+			// } else {
+			sb.WriteString(fmt.Sprintf("[%v]", path))
+			// }
+
+		default:
+			s := fmt.Sprintf("%v", path)
+			var _, errParsingInt = strconv.ParseInt(s, 10, 64) // nolint
+
+			hasSpecial := strings.Contains(s, ".") || strings.Contains(s, "[") || strings.Contains(s, "]") || strings.Contains(s, "\"")
+			hasDoubleQuotes := strings.Contains(s, "\"")
+			wrappingCharacterStart := "\""
+			wrappingCharacterEnd := "\""
+			if hasDoubleQuotes {
+				wrappingCharacterStart = "("
+				wrappingCharacterEnd = ")"
+			}
+			if hasSpecial || errParsingInt == nil {
+				sb.WriteString(wrappingCharacterStart)
+			}
+			sb.WriteString(s)
+			if hasSpecial || errParsingInt == nil {
+				sb.WriteString(wrappingCharacterEnd)
+			}
+		}
+
+		if index < len(pathStack)-1 {
+			sb.WriteString(".")
+		}
+	}
+	return sb.String()
 }
--- a/pkg/yqlib/color_print.go
+++ b/pkg/yqlib/color_print.go
@ -17,8 +17,8 @@ func format(attr color.Attribute) string {
 	return fmt.Sprintf("%s[%dm", escape, attr)
 }

-func colorizeAndPrint(yamlBytes []byte, writer io.Writer) error {
-	tokens := lexer.Tokenize(string(yamlBytes))
+func ColorizeAndPrint(bytes []byte, writer io.Writer) error {
+	tokens := lexer.Tokenize(string(bytes))
 	var p printer.Printer
 	p.Bool = func() *printer.Property {
 		return &printer.Property{
--- a/pkg/yqlib/context.go
+++ b/pkg/yqlib/context.go
@ -1,68 +0,0 @@
-package yqlib
-
-import (
-	"container/list"
-
-	"github.com/jinzhu/copier"
-)
-
-type Context struct {
-	MatchingNodes  *list.List
-	Variables      map[string]*list.List
-	DontAutoCreate bool
-}
-
-func (n *Context) SingleReadonlyChildContext(candidate *CandidateNode) Context {
-	list := list.New()
-	list.PushBack(candidate)
-	newContext := n.ChildContext(list)
-	newContext.DontAutoCreate = true
-	return newContext
-}
-
-func (n *Context) SingleChildContext(candidate *CandidateNode) Context {
-	list := list.New()
-	list.PushBack(candidate)
-	return n.ChildContext(list)
-}
-
-func (n *Context) GetVariable(name string) *list.List {
-	if n.Variables == nil {
-		return nil
-	}
-	return n.Variables[name]
-}
-
-func (n *Context) SetVariable(name string, value *list.List) {
-	if n.Variables == nil {
-		n.Variables = make(map[string]*list.List)
-	}
-	n.Variables[name] = value
-}
-
-func (n *Context) ChildContext(results *list.List) Context {
-	clone := Context{}
-	err := copier.Copy(&clone, n)
-	if err != nil {
-		log.Error("Error cloning context :(")
-		panic(err)
-	}
-	clone.MatchingNodes = results
-	return clone
-}
-
-func (n *Context) Clone() Context {
-	clone := Context{}
-	err := copier.Copy(&clone, n)
-	if err != nil {
-		log.Error("Error cloning context :(")
-		panic(err)
-	}
-	return clone
-}
-
-func (n *Context) ReadOnlyClone() Context {
-	clone := n.Clone()
-	clone.DontAutoCreate = true
-	return clone
-}
--- a/pkg/yqlib/data_tree_navigator.go
+++ b/pkg/yqlib/data_tree_navigator.go
@ -3,14 +3,16 @@ package yqlib
 import (
 	"fmt"

+	"container/list"
+
 	logging "gopkg.in/op/go-logging.v1"
 )

 type DataTreeNavigator interface {
-	// given the context and a expressionNode,
-	// this will process the against the given expressionNode and return
-	// a new context of matching candidates
-	GetMatchingNodes(context Context, expressionNode *ExpressionNode) (Context, error)
+	// given a list of CandidateEntities and a pathNode,
+	// this will process the list against the given pathNode and return
+	// a new list of matching candidates
+	GetMatchingNodes(matchingNodes *list.List, pathNode *PathTreeNode) (*list.List, error)
 }

 type dataTreeNavigator struct {
@ -20,22 +22,22 @@ func NewDataTreeNavigator() DataTreeNavigator {
 	return &dataTreeNavigator{}
 }

-func (d *dataTreeNavigator) GetMatchingNodes(context Context, expressionNode *ExpressionNode) (Context, error) {
-	if expressionNode == nil {
+func (d *dataTreeNavigator) GetMatchingNodes(matchingNodes *list.List, pathNode *PathTreeNode) (*list.List, error) {
+	if pathNode == nil {
 		log.Debugf("getMatchingNodes - nothing to do")
-		return context, nil
+		return matchingNodes, nil
 	}
-	log.Debugf("Processing Op: %v", expressionNode.Operation.toString())
+	log.Debugf("Processing Op: %v", pathNode.Operation.toString())
 	if log.IsEnabledFor(logging.DEBUG) {
-		for el := context.MatchingNodes.Front(); el != nil; el = el.Next() {
+		for el := matchingNodes.Front(); el != nil; el = el.Next() {
 			log.Debug(NodeToString(el.Value.(*CandidateNode)))
 		}
 	}
 	log.Debug(">>")
-	handler := expressionNode.Operation.OperationType.Handler
+	handler := pathNode.Operation.OperationType.Handler
 	if handler != nil {
-		return handler(d, context, expressionNode)
+		return handler(d, matchingNodes, pathNode)
 	}
-	return Context{}, fmt.Errorf("Unknown operator %v", expressionNode.Operation.OperationType)
+	return nil, fmt.Errorf("Unknown operator %v", pathNode.Operation.OperationType)

 }
--- a/pkg/yqlib/doc/Add.md
+++ b/pkg/yqlib/doc/Add.md
@ -1,9 +1,9 @@
 Add behaves differently according to the type of the LHS:
 - arrays: concatenate
- number scalars: arithmetic addition
- string scalars: concatenate
+- number scalars: arithmetic addition (soon)
+- string scalars: concatenate (soon)

-Use `+=` as append assign for things like increment. Note that `.a += .x` is equivalent to running `.a = .a + .x`.
+Use `+=` as append assign for things like increment. `.a += .x` is equivalent to running `.a |= . + .x`.

 ## Concatenate and assign arrays
 Given a sample.yml file of:
@ -67,19 +67,23 @@ will output
 - 2
 ```

-## Add new object to array
+## Add object to array
 Given a sample.yml file of:
 ```yaml
 a:
-  - dog: woof
+  - 1
+  - 2
+c:
+  cat: meow
 ```
 then
 ```bash
-yq eval '.a + {"cat": "meow"}' sample.yml
+yq eval '.a + .c' sample.yml
 ```
 will output
 ```yaml
- dog: woof
+- 1
+- 2
 - cat: meow
 ```

@ -101,7 +105,7 @@ will output
 - hello
 ```

-## Append to array
+## Update array (append)
 Given a sample.yml file of:
 ```yaml
 a:
@ -127,113 +131,3 @@ b:
  - 4
 ```

-## Relative append
-Given a sample.yml file of:
-```yaml
-a:
-  a1:
-    b:
-      - cat
-  a2:
-    b:
-      - dog
-  a3: {}
-```
-then
-```bash
-yq eval '.a[].b += ["mouse"]' sample.yml
-```
-will output
-```yaml
-a:
-  a1:
-    b:
-      - cat
-      - mouse
-  a2:
-    b:
-      - dog
-      - mouse
-  a3: {b: [mouse]}
-```
-
-## String concatenation
-Given a sample.yml file of:
-```yaml
-a: cat
-b: meow
-```
-then
-```bash
-yq eval '.a = .a + .b' sample.yml
-```
-will output
-```yaml
-a: catmeow
-b: meow
-```
-
-## Number addition - float
-If the lhs or rhs are floats then the expression will be calculated with floats.
-
-Given a sample.yml file of:
-```yaml
-a: 3
-b: 4.9
-```
-then
-```bash
-yq eval '.a = .a + .b' sample.yml
-```
-will output
-```yaml
-a: 7.9
-b: 4.9
-```
-
-## Number addition - int
-If both the lhs and rhs are ints then the expression will be calculated with ints.
-
-Given a sample.yml file of:
-```yaml
-a: 3
-b: 4
-```
-then
-```bash
-yq eval '.a = .a + .b' sample.yml
-```
-will output
-```yaml
-a: 7
-b: 4
-```
-
-## Increment numbers
-Given a sample.yml file of:
-```yaml
-a: 3
-b: 5
-```
-then
-```bash
-yq eval '.[] += 1' sample.yml
-```
-will output
-```yaml
-a: 4
-b: 6
-```
-
-## Add to null
-Adding to null simply returns the rhs
-
-Running
-```bash
-yq eval --null-input 'null + "cat"'
-```
-will output
-```yaml
-cat
-```
-
--- a/pkg/yqlib/doc/Anchor
+++ b/pkg/yqlib/doc/Anchor
@ -1,99 +1,8 @@
-Use the `alias` and `anchor` operators to read and write yaml aliases and anchors. The `explode` operator normalises a yaml file (dereference (or expands) aliases and remove anchor names).
+Use the `alias` and `anchor` operators to read and write yaml aliases and anchors. The `explode` operator normalises a yaml file (dereference aliases and remove anchor names).

 `yq` supports merge aliases (like `<<: *blah`) however this is no longer in the standard yaml spec (1.2) and so `yq` will automatically add the `!!merge` tag to these nodes as it is effectively a custom tag.


-## Merge one map
-see https://yaml.org/type/merge.html
-
-Given a sample.yml file of:
-```yaml
- &CENTER
-  x: 1
-  y: 2
- &LEFT
-  x: 0
-  y: 2
- &BIG
-  r: 10
- &SMALL
-  r: 1
- !!merge <<: *CENTER
-  r: 10
-```
-then
-```bash
-yq eval '.[4] | explode(.)' sample.yml
-```
-will output
-```yaml
-x: 1
-y: 2
-r: 10
-```
-
-## Merge multiple maps
-see https://yaml.org/type/merge.html
-
-Given a sample.yml file of:
-```yaml
- &CENTER
-  x: 1
-  y: 2
- &LEFT
-  x: 0
-  y: 2
- &BIG
-  r: 10
- &SMALL
-  r: 1
- !!merge <<:
-    - *CENTER
-    - *BIG
-```
-then
-```bash
-yq eval '.[4] | explode(.)' sample.yml
-```
-will output
-```yaml
-r: 10
-x: 1
-y: 2
-```
-
-## Override
-see https://yaml.org/type/merge.html
-
-Given a sample.yml file of:
-```yaml
- &CENTER
-  x: 1
-  y: 2
- &LEFT
-  x: 0
-  y: 2
- &BIG
-  r: 10
- &SMALL
-  r: 1
- !!merge <<:
-    - *BIG
-    - *LEFT
-    - *SMALL
-  x: 1
-```
-then
-```bash
-yq eval '.[4] | explode(.)' sample.yml
-```
-will output
-```yaml
-r: 10
-x: 1
-y: 2
-```
-
 ## Get anchor
 Given a sample.yml file of:
 ```yaml
@ -122,22 +31,6 @@ will output
 a: &foobar cat
 ```

-## Set anchor relatively using assign-update
-Given a sample.yml file of:
-```yaml
-a:
-  b: cat
-```
-then
-```bash
-yq eval '.a anchor |= .b' sample.yml
-```
-will output
-```yaml
-a: &cat
-  b: cat
-```
-
 ## Get alias
 Given a sample.yml file of:
 ```yaml
@ -169,39 +62,6 @@ b: &meow purr
 a: *meow
 ```

-## Set alias to blank does nothing
-Given a sample.yml file of:
-```yaml
-b: &meow purr
-a: cat
-```
-then
-```bash
-yq eval '.a alias = ""' sample.yml
-```
-will output
-```yaml
-b: &meow purr
-a: cat
-```
-
-## Set alias relatively using assign-update
-Given a sample.yml file of:
-```yaml
-b: &meow purr
-a:
-  f: meow
-```
-then
-```bash
-yq eval '.a alias |= .f' sample.yml
-```
-will output
-```yaml
-b: &meow purr
-a: *meow
-```
-
 ## Explode alias and anchor
 Given a sample.yml file of:
 ```yaml
@ -290,9 +150,9 @@ bar:
  c: bar_c
 foobarList:
  b: bar_b
-  thing: foo_thing
-  c: foobarList_c
  a: foo_a
+  thing: bar_thing
+  c: foobarList_c
 foobar:
  c: foo_c
  a: foo_a
--- a/pkg/yqlib/doc/Assign.md
+++ b/pkg/yqlib/doc/Assign.md
@ -1,4 +1,10 @@
+This operator is used to update node values. It can be used in either the:

+### plain form: `=`
+Which will assign the LHS node values to the RHS node values. The RHS expression is run against the matching nodes in the pipeline.
+
+### relative form: `|=`
+This will do a similar thing to the plain form, however, the RHS expression is run against _the LHS nodes_. This is useful for updating values based on old values, e.g. increment.
 ## Create yaml file
 Running
 ```bash
--- a/pkg/yqlib/doc/Boolean
+++ b/pkg/yqlib/doc/Boolean
@ -1,14 +1,5 @@
-The `or` and `and` operators take two parameters and return a boolean result. 
-
-`not` flips a boolean from true to false, or vice versa. 
-
-`any` will return `true` if there are any `true` values in a array sequence, and `all` will return true if _all_ elements in an array are true.
-
-`any_c(condition)` and `all_c(condition)` are like `any` and `all` but they take a condition expression that is used against each element to determine if it's `true`. Note: in `jq` you can simply pass a condition to `any` or `all` and it simply works - `yq` isn't that clever..yet
-
-These are most commonly used with the `select` operator to filter particular nodes.
-
-## `or` example
+The `or` and `and` operators take two parameters and return a boolean result. `not` flips a boolean from true to false, or vice versa. These are most commonly used with the `select` operator to filter particular nodes.
+## OR example
 Running
 ```bash
 yq eval --null-input 'true or false'
@ -18,7 +9,7 @@ will output
 true
 ```

-## `and` example
+## AND example
 Running
 ```bash
 yq eval --null-input 'true and false'
@ -50,104 +41,6 @@ will output
  b: fly
 ```

-## `any` returns true if any boolean in a given array is true
-Given a sample.yml file of:
-```yaml
- false
- true
-```
-then
-```bash
-yq eval 'any' sample.yml
-```
-will output
-```yaml
-true
-```
-
-## `any` returns false for an empty array
-Given a sample.yml file of:
-```yaml
-[]
-```
-then
-```bash
-yq eval 'any' sample.yml
-```
-will output
-```yaml
-false
-```
-
-## `any_c` returns true if any element in the array is true for the given condition.
-Given a sample.yml file of:
-```yaml
-a:
-  - rad
-  - awesome
-b:
-  - meh
-  - whatever
-```
-then
-```bash
-yq eval '.[] |= any_c(. == "awesome")' sample.yml
-```
-will output
-```yaml
-a: true
-b: false
-```
-
-## `all` returns true if all booleans in a given array are true
-Given a sample.yml file of:
-```yaml
- true
- true
-```
-then
-```bash
-yq eval 'all' sample.yml
-```
-will output
-```yaml
-true
-```
-
-## `all` returns true for an empty array
-Given a sample.yml file of:
-```yaml
-[]
-```
-then
-```bash
-yq eval 'all' sample.yml
-```
-will output
-```yaml
-true
-```
-
-## `all_c` returns true if all elements in the array are true for the given condition.
-Given a sample.yml file of:
-```yaml
-a:
-  - rad
-  - awesome
-b:
-  - meh
-  - 12
-```
-then
-```bash
-yq eval '.[] |= all_c(tag == "!!str")' sample.yml
-```
-will output
-```yaml
-a: true
-b: false
-```
-
 ## Not true is false
 Running
 ```bash
--- a/pkg/yqlib/doc/Collect
+++ b/pkg/yqlib/doc/Collect
--- a/pkg/yqlib/doc/Comment
+++ b/pkg/yqlib/doc/Comment
@ -1,15 +1,4 @@
 Use these comment operators to set or retrieve comments.
-
-Like the `=` and `|=` assign operators, the same syntax applies when updating comments:
-
-
-### plain form: `=`
-This will assign the LHS nodes comments to the expression on the RHS. The RHS is run against the matching nodes in the pipeline
-
-### relative form: `|=` 
-Similar to the plain form, however the RHS evaluates against each matching LHS node! This is useful if you want to set the comments as a relative expression of the node, for instance its value or path.
-
-
 ## Set line comment
 Given a sample.yml file of:
 ```yaml
@ -24,22 +13,6 @@ will output
 a: cat # single
 ```

-## Use update assign to perform relative updates
-Given a sample.yml file of:
-```yaml
-a: cat
-b: dog
-```
-then
-```bash
-yq eval '.. lineComment |= .' sample.yml
-```
-will output
-```yaml
-a: cat # cat
-b: dog # dog
-```
-
 ## Set head comment
 Given a sample.yml file of:
 ```yaml
@ -88,23 +61,18 @@ a: cat
 b: dog # leave this
 ```

-## Remove (strip) all comments
-Note the use of `...` to ensure key nodes are included.
-
+## Remove all comments
 Given a sample.yml file of:
 ```yaml
 a: cat # comment
-# great
-b: # key comment
 ```
 then
 ```bash
-yq eval '... comments=""' sample.yml
+yq eval '.. comments=""' sample.yml
 ```
 will output
 ```yaml
 a: cat
-b:
 ```

 ## Get line comment
--- a/pkg/yqlib/doc/Delete.md
+++ b/pkg/yqlib/doc/Delete.md
@ -95,23 +95,3 @@ will output
 b: dog
 ```

-## Recursively delete matching keys
-Given a sample.yml file of:
-```yaml
-a:
-  name: frog
-  b:
-    name: blog
-    age: 12
-```
-then
-```bash
-yq eval 'del(.. | select(has("name")).name)' sample.yml
-```
-will output
-```yaml
-a:
-  b:
-    age: 12
-```
-
--- a/pkg/yqlib/doc/Document
+++ b/pkg/yqlib/doc/Document
@ -1,4 +1,4 @@
-Use the `documentIndex` operator (or the `di` shorthand) to select nodes of a particular document.
+Use the `documentIndex` operator to select nodes of a particular document.
 ## Retrieve a document index
 Given a sample.yml file of:
 ```yaml
@ -17,24 +17,6 @@ will output
 1
 ```

-## Retrieve a document index, shorthand
-Given a sample.yml file of:
-```yaml
-a: cat
---
-a: frog
-```
-then
-```bash
-yq eval '.a | di' sample.yml
-```
-will output
-```yaml
-0
---
-1
-```
-
 ## Filter by document index
 Given a sample.yml file of:
 ```yaml
@ -51,22 +33,6 @@ will output
 a: frog
 ```

-## Filter by document index shorthand
-Given a sample.yml file of:
-```yaml
-a: cat
---
-a: frog
-```
-then
-```bash
-yq eval 'select(di == 1)' sample.yml
-```
-will output
-```yaml
-a: frog
-```
-
 ## Print Document Index with matches
 Given a sample.yml file of:
 ```yaml
--- a/pkg/yqlib/doc/Entries.md
+++ b/pkg/yqlib/doc/Entries.md
@ -1,100 +0,0 @@
-Similar to the same named functions in `jq` these functions convert to/from an object and an array of key-value pairs. This is most useful for performing operations on keys of maps.
-## to_entries Map
-Given a sample.yml file of:
-```yaml
-a: 1
-b: 2
-```
-then
-```bash
-yq eval 'to_entries' sample.yml
-```
-will output
-```yaml
- key: a
-  value: 1
- key: b
-  value: 2
-```
-
-## to_entries Array
-Given a sample.yml file of:
-```yaml
- a
- b
-```
-then
-```bash
-yq eval 'to_entries' sample.yml
-```
-will output
-```yaml
- key: 0
-  value: a
- key: 1
-  value: b
-```
-
-## to_entries null
-Given a sample.yml file of:
-```yaml
-null
-```
-then
-```bash
-yq eval 'to_entries' sample.yml
-```
-will output
-```yaml
-```
-
-## from_entries map
-Given a sample.yml file of:
-```yaml
-a: 1
-b: 2
-```
-then
-```bash
-yq eval 'to_entries | from_entries' sample.yml
-```
-will output
-```yaml
-a: 1
-b: 2
-```
-
-## from_entries with numeric key indexes
-from_entries always creates a map, even for numeric keys
-
-Given a sample.yml file of:
-```yaml
- a
- b
-```
-then
-```bash
-yq eval 'to_entries | from_entries' sample.yml
-```
-will output
-```yaml
-0: a
-1: b
-```
-
-## Use with_entries to update keys
-Given a sample.yml file of:
-```yaml
-a: 1
-b: 2
-```
-then
-```bash
-yq eval 'with_entries(.key |= "KEY_" + .)' sample.yml
-```
-will output
-```yaml
-KEY_a: 1
-KEY_b: 2
-```
-
--- a/pkg/yqlib/doc/Env
+++ b/pkg/yqlib/doc/Env
@ -1,78 +0,0 @@
-This operator is used to handle environment variables usage in path expressions. While environment variables can, of course, be passed in via your CLI with string interpolation, this often comes with complex quote escaping and can be tricky to write and read. Note that there are two forms, `env` which will parse the environment variable as a yaml (be it a map, array, string, number of boolean) and `strenv` which will always parse the argument as a string.
-
-
-## Read string environment variable
-Running
-```bash
-myenv="cat meow" yq eval --null-input '.a = env(myenv)'
-```
-will output
-```yaml
-a: cat meow
-```
-
-## Read boolean environment variable
-Running
-```bash
-myenv="true" yq eval --null-input '.a = env(myenv)'
-```
-will output
-```yaml
-a: true
-```
-
-## Read numeric environment variable
-Running
-```bash
-myenv="12" yq eval --null-input '.a = env(myenv)'
-```
-will output
-```yaml
-a: 12
-```
-
-## Read yaml environment variable
-Running
-```bash
-myenv="{b: fish}" yq eval --null-input '.a = env(myenv)'
-```
-will output
-```yaml
-a: {b: fish}
-```
-
-## Read boolean environment variable as a string
-Running
-```bash
-myenv="true" yq eval --null-input '.a = strenv(myenv)'
-```
-will output
-```yaml
-a: "true"
-```
-
-## Read numeric environment variable as a string
-Running
-```bash
-myenv="12" yq eval --null-input '.a = strenv(myenv)'
-```
-will output
-```yaml
-a: "12"
-```
-
-## Dynamic key lookup with environment variable
-Given a sample.yml file of:
-```yaml
-cat: meow
-dog: woof
-```
-then
-```bash
-myenv="cat" yq eval '.[env(myenv)]' sample.yml
-```
-will output
-```yaml
-meow
-```
-
--- a/pkg/yqlib/doc/Equals.md
+++ b/pkg/yqlib/doc/Equals.md
@ -29,24 +29,6 @@ true
 false
 ```

-## Don't match string
-Given a sample.yml file of:
-```yaml
- cat
- goat
- dog
-```
-then
-```bash
-yq eval '.[] | (. != "*at")' sample.yml
-```
-will output
-```yaml
-false
-false
-true
-```
-
 ## Match number
 Given a sample.yml file of:
 ```yaml
@ -65,24 +47,6 @@ true
 false
 ```

-## Dont match number
-Given a sample.yml file of:
-```yaml
- 3
- 4
- 5
-```
-then
-```bash
-yq eval '.[] | (. != 4)' sample.yml
-```
-will output
-```yaml
-true
-false
-true
-```
-
 ## Match nulls
 Running
 ```bash
@ -93,31 +57,3 @@ will output
 true
 ```

-## Non exisitant key doesn't equal a value
-Given a sample.yml file of:
-```yaml
-a: frog
-```
-then
-```bash
-yq eval 'select(.b != "thing")' sample.yml
-```
-will output
-```yaml
-a: frog
-```
-
-## Two non existant keys are equal
-Given a sample.yml file of:
-```yaml
-a: frog
-```
-then
-```bash
-yq eval 'select(.b == .c)' sample.yml
-```
-will output
-```yaml
-a: frog
-```
-
--- a/pkg/yqlib/doc/File
+++ b/pkg/yqlib/doc/File
@ -35,26 +35,6 @@ will output
 0
 ```

-## Get file indices of multiple documents
-Given a sample.yml file of:
-```yaml
-a: cat
-```
-And another sample another.yml file of:
-```yaml
-a: cat
-```
-then
-```bash
-yq eval-all 'fileIndex' sample.yml another.yml
-```
-will output
-```yaml
-0
---
-1
-```
-
 ## Get file index alias
 Given a sample.yml file of:
 ```yaml
--- a/pkg/yqlib/doc/Has.md
+++ b/pkg/yqlib/doc/Has.md
@ -19,29 +19,6 @@ true
 false
 ```

-## Select, checking for existence of deep paths
-Simply pipe in parent expressions into `has`
-
-Given a sample.yml file of:
-```yaml
- a:
-    b:
-      c: cat
- a:
-    b:
-      d: dog
-```
-then
-```bash
-yq eval '.[] | select(.a.b | has("c"))' sample.yml
-```
-will output
-```yaml
-a:
-  b:
-    c: cat
-```
-
 ## Has array index
 Given a sample.yml file of:
 ```yaml
--- a/pkg/yqlib/doc/Keys.md
+++ b/pkg/yqlib/doc/Keys.md
@ -1,35 +0,0 @@
-# Keys
-
-Use the `keys` operator to return map keys or array indices. 
-## Map keys
-Given a sample.yml file of:
-```yaml
-dog: woof
-cat: meow
-```
-then
-```bash
-yq eval 'keys' sample.yml
-```
-will output
-```yaml
- dog
- cat
-```
-
-## Array keys
-Given a sample.yml file of:
-```yaml
- apple
- banana
-```
-then
-```bash
-yq eval 'keys' sample.yml
-```
-will output
-```yaml
- 0
- 1
-```
-
--- a/pkg/yqlib/doc/Length.md
+++ b/pkg/yqlib/doc/Length.md
@ -16,20 +16,6 @@ will output
 3
 ```

-## null length
-Given a sample.yml file of:
-```yaml
-a: null
-```
-then
-```bash
-yq eval '.a | length' sample.yml
-```
-will output
-```yaml
-0
-```
-
 ## Map length
 returns number of entries

--- a/pkg/yqlib/doc/Multiply
+++ b/pkg/yqlib/doc/Multiply
@ -1,366 +0,0 @@
-Like the multiple operator in jq, depending on the operands, this multiply operator will do different things. Currently numbers, arrays and objects are supported.
-
-## Objects and arrays - merging
-Objects are merged deeply matching on matching keys. By default, array values override and are not deeply merged.
-
-Note that when merging objects, this operator returns the merged object (not the parent). This will be clearer in the examples below.
-
-### Merge Flags
-You can control how objects are merged by using one or more of the following flags. Multiple flags can be used together, e.g. `.a *+? .b`.  See examples below
-
- `+` to append arrays
- `?` to only merge existing fields
- `d` to deeply merge arrays
-
-### Merging files
-Note the use of `eval-all` to ensure all documents are loaded into memory.
-
-```bash
-yq eval-all 'select(fileIndex == 0) * select(fileIndex == 1)' file1.yaml file2.yaml
-```
-
-## Multiply integers
-Running
-```bash
-yq eval --null-input '3 * 4'
-```
-will output
-```yaml
-12
-```
-
-## Merge objects together, returning merged result only
-Given a sample.yml file of:
-```yaml
-a:
-  field: me
-  fieldA: cat
-b:
-  field:
-    g: wizz
-  fieldB: dog
-```
-then
-```bash
-yq eval '.a * .b' sample.yml
-```
-will output
-```yaml
-field:
-  g: wizz
-fieldA: cat
-fieldB: dog
-```
-
-## Merge objects together, returning parent object
-Given a sample.yml file of:
-```yaml
-a:
-  field: me
-  fieldA: cat
-b:
-  field:
-    g: wizz
-  fieldB: dog
-```
-then
-```bash
-yq eval '. * {"a":.b}' sample.yml
-```
-will output
-```yaml
-a:
-  field:
-    g: wizz
-  fieldA: cat
-  fieldB: dog
-b:
-  field:
-    g: wizz
-  fieldB: dog
-```
-
-## Merge keeps style of LHS
-Given a sample.yml file of:
-```yaml
-a: {things: great}
-b:
-  also: "me"
-```
-then
-```bash
-yq eval '. * {"a":.b}' sample.yml
-```
-will output
-```yaml
-a: {things: great, also: "me"}
-b:
-  also: "me"
-```
-
-## Merge arrays
-Given a sample.yml file of:
-```yaml
-a:
-  - 1
-  - 2
-  - 3
-b:
-  - 3
-  - 4
-  - 5
-```
-then
-```bash
-yq eval '. * {"a":.b}' sample.yml
-```
-will output
-```yaml
-a:
-  - 3
-  - 4
-  - 5
-b:
-  - 3
-  - 4
-  - 5
-```
-
-## Merge, only existing fields
-Given a sample.yml file of:
-```yaml
-a:
-  thing: one
-  cat: frog
-b:
-  missing: two
-  thing: two
-```
-then
-```bash
-yq eval '.a *? .b' sample.yml
-```
-will output
-```yaml
-thing: two
-cat: frog
-```
-
-## Merge, appending arrays
-Given a sample.yml file of:
-```yaml
-a:
-  array:
-    - 1
-    - 2
-    - animal: dog
-  value: coconut
-b:
-  array:
-    - 3
-    - 4
-    - animal: cat
-  value: banana
-```
-then
-```bash
-yq eval '.a *+ .b' sample.yml
-```
-will output
-```yaml
-array:
-  - 1
-  - 2
-  - animal: dog
-  - 3
-  - 4
-  - animal: cat
-value: banana
-```
-
-## Merge, only existing fields, appending arrays
-Given a sample.yml file of:
-```yaml
-a:
-  thing:
-    - 1
-    - 2
-b:
-  thing:
-    - 3
-    - 4
-  another:
-    - 1
-```
-then
-```bash
-yq eval '.a *?+ .b' sample.yml
-```
-will output
-```yaml
-thing:
-  - 1
-  - 2
-  - 3
-  - 4
-```
-
-## Merge, deeply merging arrays
-Merging arrays deeply means arrays are merge like objects, with indexes as their key. In this case, we merge the first item in the array, and do nothing with the second.
-
-Given a sample.yml file of:
-```yaml
-a:
-  - name: fred
-    age: 12
-  - name: bob
-    age: 32
-b:
-  - name: fred
-    age: 34
-```
-then
-```bash
-yq eval '.a *d .b' sample.yml
-```
-will output
-```yaml
- name: fred
-  age: 34
- name: bob
-  age: 32
-```
-
-## Merge arrays of objects together, matching on a key
-It's a complex command, the trickyness comes from needing to have the right context in the expressions.
-First we save the second array into a variable '$two' which lets us reference it later.
-We then need to update the first array. We will use the relative update (|=) because we need to update relative to the current element of the array in the LHS in the RHS expression. 
-We set the current element of the first array as $cur. Now we multiply (merge) $cur with the matching entry in $two, by passing $two through a select filter.
-
-
-Given a sample.yml file of:
-```yaml
- a: apple
-  b: appleB
- a: kiwi
-  b: kiwiB
- a: banana
-  b: bananaB
-```
-And another sample another.yml file of:
-```yaml
- a: banana
-  c: bananaC
- a: apple
-  b: appleB2
- a: dingo
-  c: dingoC
-```
-then
-```bash
-yq eval-all '(select(fi==1) | .[]) as $two | select(fi==0) | .[] |= (. as $cur |  $cur * ($two | select(.a == $cur.a)))' sample.yml another.yml
-```
-will output
-```yaml
- a: apple
-  b: appleB2
- a: kiwi
-  b: kiwiB
- a: banana
-  b: bananaB
-  c: bananaC
-```
-
-## Merge to prefix an element
-Given a sample.yml file of:
-```yaml
-a: cat
-b: dog
-```
-then
-```bash
-yq eval '. * {"a": {"c": .a}}' sample.yml
-```
-will output
-```yaml
-a:
-  c: cat
-b: dog
-```
-
-## Merge with simple aliases
-Given a sample.yml file of:
-```yaml
-a: &cat
-  c: frog
-b:
-  f: *cat
-c:
-  g: thongs
-```
-then
-```bash
-yq eval '.c * .b' sample.yml
-```
-will output
-```yaml
-g: thongs
-f: *cat
-```
-
-## Merge copies anchor names
-Given a sample.yml file of:
-```yaml
-a:
-  c: &cat frog
-b:
-  f: *cat
-c:
-  g: thongs
-```
-then
-```bash
-yq eval '.c * .a' sample.yml
-```
-will output
-```yaml
-g: thongs
-c: &cat frog
-```
-
-## Merge with merge anchors
-Given a sample.yml file of:
-```yaml
-foo: &foo
-  a: foo_a
-  thing: foo_thing
-  c: foo_c
-bar: &bar
-  b: bar_b
-  thing: bar_thing
-  c: bar_c
-foobarList:
-  b: foobarList_b
-  !!merge <<:
-    - *foo
-    - *bar
-  c: foobarList_c
-foobar:
-  c: foobar_c
-  !!merge <<: *foo
-  thing: foobar_thing
-```
-then
-```bash
-yq eval '.foobar * .foobarList' sample.yml
-```
-will output
-```yaml
-c: foobarList_c
-<<:
-  - *foo
-  - *bar
-thing: foobar_thing
-b: foobarList_b
-```
-
--- a/pkg/yqlib/doc/Multiply.md
+++ b/pkg/yqlib/doc/Multiply.md
@ -0,0 +1,238 @@
+Like the multiple operator in `jq`, depending on the operands, this multiply operator will do different things. Currently only objects are supported, which have the effect of merging the RHS into the LHS.
+
+Upcoming versions of `yq` will add support for other types of multiplication (numbers, strings).
+
+To concatenate when merging objects, use the `*+` form (see examples below). This will recursively merge objects, appending arrays when it encounters them.
+
+Note that when merging objects, this operator returns the merged object (not the parent). This will be clearer in the examples below.
+
+## Merging files
+Note the use of eval-all to ensure all documents are loaded into memory.
+
+```bash
+yq eval-all 'select(fileIndex == 0) * select(fileIndex == 1)' file1.yaml file2.yaml
+```
+
+## Merge objects together, returning merged result only
+Given a sample.yml file of:
+```yaml
+a:
+  field: me
+  fieldA: cat
+b:
+  field:
+    g: wizz
+  fieldB: dog
+```
+then
+```bash
+yq eval '.a * .b' sample.yml
+```
+will output
+```yaml
+field:
+  g: wizz
+fieldA: cat
+fieldB: dog
+```
+
+## Merge objects together, returning parent object
+Given a sample.yml file of:
+```yaml
+a:
+  field: me
+  fieldA: cat
+b:
+  field:
+    g: wizz
+  fieldB: dog
+```
+then
+```bash
+yq eval '. * {"a":.b}' sample.yml
+```
+will output
+```yaml
+a:
+  field:
+    g: wizz
+  fieldA: cat
+  fieldB: dog
+b:
+  field:
+    g: wizz
+  fieldB: dog
+```
+
+## Merge keeps style of LHS
+Given a sample.yml file of:
+```yaml
+a: {things: great}
+b:
+  also: "me"
+
+```
+then
+```bash
+yq eval '. * {"a":.b}' sample.yml
+```
+will output
+```yaml
+a: {things: great, also: "me"}
+b:
+  also: "me"
+```
+
+## Merge arrays
+Given a sample.yml file of:
+```yaml
+a:
+  - 1
+  - 2
+  - 3
+b:
+  - 3
+  - 4
+  - 5
+```
+then
+```bash
+yq eval '. * {"a":.b}' sample.yml
+```
+will output
+```yaml
+a:
+  - 3
+  - 4
+  - 5
+b:
+  - 3
+  - 4
+  - 5
+```
+
+## Merge, appending arrays
+Given a sample.yml file of:
+```yaml
+a:
+  array:
+    - 1
+    - 2
+    - animal: dog
+  value: coconut
+b:
+  array:
+    - 3
+    - 4
+    - animal: cat
+  value: banana
+```
+then
+```bash
+yq eval '.a *+ .b' sample.yml
+```
+will output
+```yaml
+array:
+  - 1
+  - 2
+  - animal: dog
+  - 3
+  - 4
+  - animal: cat
+value: banana
+```
+
+## Merge to prefix an element
+Given a sample.yml file of:
+```yaml
+a: cat
+b: dog
+```
+then
+```bash
+yq eval '. * {"a": {"c": .a}}' sample.yml
+```
+will output
+```yaml
+a:
+  c: cat
+b: dog
+```
+
+## Merge with simple aliases
+Given a sample.yml file of:
+```yaml
+a: &cat
+  c: frog
+b:
+  f: *cat
+c:
+  g: thongs
+```
+then
+```bash
+yq eval '.c * .b' sample.yml
+```
+will output
+```yaml
+g: thongs
+f: *cat
+```
+
+## Merge does not copy anchor names
+Given a sample.yml file of:
+```yaml
+a:
+  c: &cat frog
+b:
+  f: *cat
+c:
+  g: thongs
+```
+then
+```bash
+yq eval '.c * .a' sample.yml
+```
+will output
+```yaml
+g: thongs
+c: frog
+```
+
+## Merge with merge anchors
+Given a sample.yml file of:
+```yaml
+foo: &foo
+  a: foo_a
+  thing: foo_thing
+  c: foo_c
+bar: &bar
+  b: bar_b
+  thing: bar_thing
+  c: bar_c
+foobarList:
+  b: foobarList_b
+  !!merge <<:
+    - *foo
+    - *bar
+  c: foobarList_c
+foobar:
+  c: foobar_c
+  !!merge <<: *foo
+  thing: foobar_thing
+```
+then
+```bash
+yq eval '.foobar * .foobarList' sample.yml
+```
+will output
+```yaml
+c: foobarList_c
+<<:
+  - *foo
+  - *bar
+thing: foobar_thing
+b: foobarList_b
+```
+
--- a/pkg/yqlib/doc/Recursive
+++ b/pkg/yqlib/doc/Recursive
@ -1,4 +1,4 @@
-This operator recursively matches (or globs) all children nodes given of a particular element, including that node itself. This is most often used to apply a filter recursively against all matches. It can be used in either the 
+This operator recursively matches all children nodes given of a particular element, including that node itself. This is most often used to apply a filter recursively against all matches. It can be used in either the 

 ## match values form `..`
 This will, like the `jq` equivalent, recursively match all _value_ nodes. Use it to find/manipulate particular values.
@ -32,50 +32,6 @@ a: frog
 frog
 ```

-## Recursively find nodes with keys
-Note that this example has wrapped the expression in `[]` to show that there are two matches returned. You do not have to wrap in `[]` in your path expression.
-
-Given a sample.yml file of:
-```yaml
-a:
-  name: frog
-  b:
-    name: blog
-    age: 12
-```
-then
-```bash
-yq eval '[.. | select(has("name"))]' sample.yml
-```
-will output
-```yaml
- name: frog
-  b:
-    name: blog
-    age: 12
- name: blog
-  age: 12
-```
-
-## Recursively find nodes with values
-Given a sample.yml file of:
-```yaml
-a:
-  nameA: frog
-  b:
-    nameB: frog
-    age: 12
-```
-then
-```bash
-yq eval '.. | select(. == "frog")' sample.yml
-```
-will output
-```yaml
-frog
-frog
-```
-
 ## Recurse map (values and keys)
 Note that the map key appears in the results

--- a/pkg/yqlib/doc/Reduce.md
+++ b/pkg/yqlib/doc/Reduce.md
@ -1,76 +0,0 @@
-Reduce is a powerful way to process a collection of data into a new form.
-
-```
-<exp> as $<name> ireduce (<init>; <block>)
-```
-
-e.g.
-
-```
-.[] as $item ireduce (0; . + $item)
-```
-
-On the LHS we are configuring the collection of items that will be reduced `<exp>` as well as what each element will be called `$<name>`. Note that the array has been splatted into its individual elements.
-
-On the RHS there is `<init>`, the starting value of the accumulator and `<block>`, the expression that will update the accumulator for each element in the collection. Note that within the block expression, `.` will evaluate to the current value of the accumulator. 
-
-## yq vs jq syntax
-Reduce syntax in `yq` is a little different from `jq` - as `yq` (currently) isn't as sophisticated as `jq` and its only supports infix notation (e.g. a + b, where the operator is in the middle of the two parameters) - where as `jq` uses a mix of infix notation with _prefix_ notation (e.g. `reduce a b` is like writing `+ a b`).
-
-To that end, the reduce operator is called `ireduce` for backwards compatability if a `jq` like prefix version of `reduce` is ever added.
-
-
-## Sum numbers
-Given a sample.yml file of:
-```yaml
- 10
- 2
- 5
- 3
-```
-then
-```bash
-yq eval '.[] as $item ireduce (0; . + $item)' sample.yml
-```
-will output
-```yaml
-20
-```
-
-## Merge all yaml files together
-Given a sample.yml file of:
-```yaml
-a: cat
-```
-And another sample another.yml file of:
-```yaml
-b: dog
-```
-then
-```bash
-yq eval-all '. as $item ireduce ({}; . * $item )' sample.yml another.yml
-```
-will output
-```yaml
-a: cat
-b: dog
-```
-
-## Convert an array to an object
-Given a sample.yml file of:
-```yaml
- name: Cathy
-  has: apples
- name: Bob
-  has: bananas
-```
-then
-```bash
-yq eval '.[] as $item ireduce ({}; .[$item | .name] = ($item | .has) )' sample.yml
-```
-will output
-```yaml
-Cathy: apples
-Bob: bananas
-```
-
--- a/pkg/yqlib/doc/Split
+++ b/pkg/yqlib/doc/Split
@ -1,31 +0,0 @@
-# Split into Documents
-
-This operator splits all matches into separate documents
-
-## Split empty
-Running
-```bash
-yq eval --null-input 'splitDoc'
-```
-will output
-```yaml
-
-```
-
-## Split array
-Given a sample.yml file of:
-```yaml
- a: cat
- b: dog
-```
-then
-```bash
-yq eval '.[] | splitDoc' sample.yml
-```
-will output
-```yaml
-a: cat
---
-b: dog
-```
-
--- a/pkg/yqlib/doc/String
+++ b/pkg/yqlib/doc/String
@ -1,88 +0,0 @@
-# String Operators
-
-## Join strings
-Given a sample.yml file of:
-```yaml
- cat
- meow
- 1
- null
- true
-```
-then
-```bash
-yq eval 'join("; ")' sample.yml
-```
-will output
-```yaml
-cat; meow; 1; ; true
-```
-
-## Substitute / Replace string
-This uses golang regex, described [here](https://github.com/google/re2/wiki/Syntax)
-Note the use of `|=` to run in context of the current string value.
-
-Given a sample.yml file of:
-```yaml
-a: dogs are great
-```
-then
-```bash
-yq eval '.a |= sub("dogs", "cats")' sample.yml
-```
-will output
-```yaml
-a: cats are great
-```
-
-## Substitute / Replace string with regex
-This uses golang regex, described [here](https://github.com/google/re2/wiki/Syntax)
-Note the use of `|=` to run in context of the current string value.
-
-Given a sample.yml file of:
-```yaml
-a: cat
-b: heat
-```
-then
-```bash
-yq eval '.[] |= sub("(a)", "${1}r")' sample.yml
-```
-will output
-```yaml
-a: cart
-b: heart
-```
-
-## Split strings
-Given a sample.yml file of:
-```yaml
-cat; meow; 1; ; true
-```
-then
-```bash
-yq eval 'split("; ")' sample.yml
-```
-will output
-```yaml
- cat
- meow
- "1"
- ""
- "true"
-```
-
-## Split strings one match
-Given a sample.yml file of:
-```yaml
-word
-```
-then
-```bash
-yq eval 'split("; ")' sample.yml
-```
-will output
-```yaml
- word
-```
-
--- a/pkg/yqlib/doc/Style.md
+++ b/pkg/yqlib/doc/Style.md
@ -1,42 +1,4 @@
 The style operator can be used to get or set the style of nodes (e.g. string style, yaml style)
-## Update and set style of a particular node (simple)
-Given a sample.yml file of:
-```yaml
-a:
-  b: thing
-  c: something
-```
-then
-```bash
-yq eval '.a.b = "new" | .a.b style="double"' sample.yml
-```
-will output
-```yaml
-a:
-  b: "new"
-  c: something
-```
-
-## Update and set style of a particular node using path variables
-You can use a variable to re-use a path
-
-Given a sample.yml file of:
-```yaml
-a:
-  b: thing
-  c: something
-```
-then
-```bash
-yq eval '.a.b as $x | $x = "new" | $x style="double"' sample.yml
-```
-will output
-```yaml
-a:
-  b: "new"
-  c: something
-```
-
 ## Set tagged style
 Given a sample.yml file of:
 ```yaml
@ -183,7 +145,7 @@ will output
 {a: cat, b: 5, c: 3.2, e: true}
 ```

-## Reset style - or pretty print
+## Pretty print
 Set empty (default) quote style, note the usage of `...` to match keys too. Note that there is a `--prettyPrint/-P` short flag for this.

 Given a sample.yml file of:
@ -205,22 +167,6 @@ c: 3.2
 e: true
 ```

-## Set style relatively with assign-update
-Given a sample.yml file of:
-```yaml
-a: single
-b: double
-```
-then
-```bash
-yq eval '.[] style |= .' sample.yml
-```
-will output
-```yaml
-a: 'single'
-b: "double"
-```
-
 ## Read style
 Given a sample.yml file of:
 ```yaml
--- a/pkg/yqlib/doc/Subtract.md
+++ b/pkg/yqlib/doc/Subtract.md
@ -1,71 +0,0 @@
-
-## Number subtraction - float
-If the lhs or rhs are floats then the expression will be calculated with floats.
-
-Given a sample.yml file of:
-```yaml
-a: 3
-b: 4.5
-```
-then
-```bash
-yq eval '.a = .a - .b' sample.yml
-```
-will output
-```yaml
-a: -1.5
-b: 4.5
-```
-
-## Number subtraction - float
-If the lhs or rhs are floats then the expression will be calculated with floats.
-
-Given a sample.yml file of:
-```yaml
-a: 3
-b: 4.5
-```
-then
-```bash
-yq eval '.a = .a - .b' sample.yml
-```
-will output
-```yaml
-a: -1.5
-b: 4.5
-```
-
-## Number subtraction - int
-If both the lhs and rhs are ints then the expression will be calculated with ints.
-
-Given a sample.yml file of:
-```yaml
-a: 3
-b: 4
-```
-then
-```bash
-yq eval '.a = .a - .b' sample.yml
-```
-will output
-```yaml
-a: -1
-b: 4
-```
-
-## Decrement numbers
-Given a sample.yml file of:
-```yaml
-a: 3
-b: 5
-```
-then
-```bash
-yq eval '.[] -= 1' sample.yml
-```
-will output
-```yaml
-a: 2
-b: 4
-```
-
--- a/pkg/yqlib/doc/Tag.md
+++ b/pkg/yqlib/doc/Tag.md
@ -22,21 +22,7 @@ will output
 !!seq
 ```

-## Set custom tag
-Given a sample.yml file of:
-```yaml
-a: str
-```
-then
-```bash
-yq eval '.a tag = "!!mikefarah"' sample.yml
-```
-will output
-```yaml
-a: !!mikefarah str
-```
-
-## Find numbers and convert them to strings
+## Convert numbers to strings
 Given a sample.yml file of:
 ```yaml
 a: cat
--- a/pkg/yqlib/doc/Traverse.md
+++ b/pkg/yqlib/doc/Traverse.md
@ -32,23 +32,8 @@ b: apple
 c: banana
 ```

-## Optional Splat
-Just like splat, but won't error if you run it against scalars
-
-Given a sample.yml file of:
-```yaml
-cat
-```
-then
-```bash
-yq eval '.[]' sample.yml
-```
-will output
-```yaml
-```
-
 ## Special characters
-Use quotes with brackets around path elements with special characters
+Use quotes around path elements with special characters

 Given a sample.yml file of:
 ```yaml
@ -56,47 +41,13 @@ Given a sample.yml file of:
 ```
 then
 ```bash
-yq eval '.["{}"]' sample.yml
+yq eval '."{}"' sample.yml
 ```
 will output
 ```yaml
 frog
 ```

-## Keys with spaces
-Use quotes with brackets around path elements with special characters
-
-Given a sample.yml file of:
-```yaml
-"red rabbit": frog
-```
-then
-```bash
-yq eval '.["red rabbit"]' sample.yml
-```
-will output
-```yaml
-frog
-```
-
-## Dynamic keys
-Expressions within [] can be used to dynamically lookup / calculate keys
-
-Given a sample.yml file of:
-```yaml
-b: apple
-apple: crispy yum
-banana: soft yum
-```
-then
-```bash
-yq eval '.[.b]' sample.yml
-```
-will output
-```yaml
-crispy yum
-```
-
 ## Children don't exist
 Nodes are added dynamically while traversing

@ -113,23 +64,6 @@ will output
 null
 ```

-## Optional identifier
-Like jq, does not output an error when the yaml is not an array or object as expected
-
-Given a sample.yml file of:
-```yaml
- 1
- 2
- 3
-```
-then
-```bash
-yq eval '.a?' sample.yml
-```
-will output
-```yaml
-```
-
 ## Wildcard matching
 Given a sample.yml file of:
 ```yaml
--- a/pkg/yqlib/doc/Unique.md
+++ b/pkg/yqlib/doc/Unique.md
@ -1,82 +0,0 @@
-This is used to filter out duplicated items in an array.
-
-## Unique array of scalars (string/numbers)
-Given a sample.yml file of:
-```yaml
- 1
- 2
- 3
- 2
-```
-then
-```bash
-yq eval 'unique' sample.yml
-```
-will output
-```yaml
- 1
- 2
- 3
-```
-
-## Unique nulls
-Unique works on the node value, so it considers different representations of nulls to be different
-
-Given a sample.yml file of:
-```yaml
- ~
- null
- ~
- null
-```
-then
-```bash
-yq eval 'unique' sample.yml
-```
-will output
-```yaml
- ~
- null
-```
-
-## Unique all nulls
-Run against the node tag to unique all the nulls
-
-Given a sample.yml file of:
-```yaml
- ~
- null
- ~
- null
-```
-then
-```bash
-yq eval 'unique_by(tag)' sample.yml
-```
-will output
-```yaml
- ~
-```
-
-## Unique array object fields
-Given a sample.yml file of:
-```yaml
- name: harry
-  pet: cat
- name: billy
-  pet: dog
- name: harry
-  pet: dog
-```
-then
-```bash
-yq eval 'unique_by(.name)' sample.yml
-```
-will output
-```yaml
- name: harry
-  pet: cat
- name: billy
-  pet: dog
-```
-
--- a/pkg/yqlib/doc/Variable
+++ b/pkg/yqlib/doc/Variable
@ -1,58 +0,0 @@
-For more complex scenarios, variables can be used to hold values of expression to be used in other expressions.
-
-## Single value variable
-Given a sample.yml file of:
-```yaml
-a: cat
-```
-then
-```bash
-yq eval '.a as $foo | $foo' sample.yml
-```
-will output
-```yaml
-cat
-```
-
-## Multi value variable
-Given a sample.yml file of:
-```yaml
- cat
- dog
-```
-then
-```bash
-yq eval '.[] as $foo | $foo' sample.yml
-```
-will output
-```yaml
-cat
-dog
-```
-
-## Using variables as a lookup
-Example taken from [jq](https://stedolan.github.io/jq/manual/#Variable/SymbolicBindingOperator:...as$identifier|...)
-
-Given a sample.yml file of:
-```yaml
-"posts":
-  - "title": Frist psot
-    "author": anon
-  - "title": A well-written article
-    "author": person1
-"realnames":
-  "anon": Anonymous Coward
-  "person1": Person McPherson
-```
-then
-```bash
-yq eval '.realnames as $names | .posts[] | {"title":.title, "author": $names[.author]}' sample.yml
-```
-will output
-```yaml
-title: Frist psot
-author: Anonymous Coward
-title: A well-written article
-author: Person McPherson
-```
-
--- a/pkg/yqlib/doc/aa.md
+++ b/pkg/yqlib/doc/aa.md
@ -1,116 +0,0 @@
-# Operators
-
-In `yq` expressions are made up of operators and pipes. A context of nodes is passed through the expression and each operation takes the context as input and returns a new context as output. That output is piped in as input for the next operation in the expression. To begin with, the context is set to the first yaml document of the first yaml file (if processing in sequence using eval).
-
-Lets look at a couple of examples.
-
-## Example with a simple operator
-
-Given a document like:
-
-```yaml
- [a]
- "cat"
-```
-
-with an expression:
-
-```
-.[] | length
-```
-
-`yq` will initially set the context as single node of the entire yaml document, an array of two elements.
-
-```yaml
- [a]
- "cat"
-```
-
-This gets piped into the splat operator `.[]` which will split out the context into a collection of two nodes `[a]` and `"cat"`. Note that this is _not_ a yaml array.
-
-The `length` operator take no arguments, and will simply return the length of _each_ matching node in the context. So for the context of `[a]` and `"cat"`, it will return a new context of `1` and `3`.
-
-This being the last operation in the expression, the results will be printed out:
-
-```
-1
-3
-```
-
-# Example with an operator that takes arguments.
-
-Given a document like:
-
-```yaml
-a: cat
-b: dog
-```
-
-with an expression:
-
-```
-.a = .b
-```
-
-The `=` operator takes two arguments, a `lhs` expression, which in this case is `.a` and `rhs` expression which is `.b`. 
-
-It pipes the current, lets call it 'root' context through the `lhs` expression of `.a` to return the node 
-
-```yaml
-cat
-```
-
-Note that this node holds not only its value 'cat', but comments and metadata too, including path and parent information.
-
-The `=` operator then pipes the 'root' context through the `rhs` expression of `.b` to return the node
-
-```yaml
-dog
-```
-
-Both sides have now been evaluated, so now the operator copies across the value from the RHS to the value on the LHS, and it returns the now updated context:
-
-```yaml
-a: dog
-b: dog
-```
-
-# Relative update (e.g. `|=`)
-There is another form of the `=` operator which we call the relative form. It's very similar to `=` but with one key difference when evaluating the RHS expression.
-
-In the plain form, we pass in the 'root' level context to the RHS expression. In relative form, we pass in _each result of the LHS_ to the RHS expression. Let's go through an example.
-
-Given a document like:
-
-```yaml
-a: 1
-b: thing
-```
-
-with an expression:
-
-```
-.a |= . + 1
-```
-
-Similar to the `=` operator, `|=` takes two operands, the LHS and RHS.
-
-It pipes the current context (the whole document) through the LHS expression  of `.a` to get the node value:
-
-```
-1
-```
-
-Now it pipes _that LHS context_ into the RHS expression `. + 1` (whereas in the `=` plain form it piped the original document context into the RHS) to yield:
-
-
-```
-2
-```
-
-The assignment operator then copies across the value from the RHS to the value on the LHS, and it returns the now updated 'root' context:
-
-```yaml
-a: 2
-b: thing
-```
--- a/pkg/yqlib/doc/headers/Add.md
+++ b/pkg/yqlib/doc/headers/Add.md
@ -1,6 +1,6 @@
 Add behaves differently according to the type of the LHS:
 - arrays: concatenate
- number scalars: arithmetic addition
- string scalars: concatenate
+- number scalars: arithmetic addition (soon)
+- string scalars: concatenate (soon)

-Use `+=` as append assign for things like increment. Note that `.a += .x` is equivalent to running `.a = .a + .x`.
+Use `+=` as append assign for things like increment. `.a += .x` is equivalent to running `.a |= . + .x`.
--- a/pkg/yqlib/doc/headers/Anchor
+++ b/pkg/yqlib/doc/headers/Anchor
@ -1,4 +1,4 @@
-Use the `alias` and `anchor` operators to read and write yaml aliases and anchors. The `explode` operator normalises a yaml file (dereference (or expands) aliases and remove anchor names).
+Use the `alias` and `anchor` operators to read and write yaml aliases and anchors. The `explode` operator normalises a yaml file (dereference aliases and remove anchor names).

 `yq` supports merge aliases (like `<<: *blah`) however this is no longer in the standard yaml spec (1.2) and so `yq` will automatically add the `!!merge` tag to these nodes as it is effectively a custom tag.

--- a/pkg/yqlib/doc/headers/Assign.md
+++ b/pkg/yqlib/doc/headers/Assign.md
--- a/pkg/yqlib/doc/headers/Boolean
+++ b/pkg/yqlib/doc/headers/Boolean
@ -1,9 +1 @@
-The `or` and `and` operators take two parameters and return a boolean result. 
-
-`not` flips a boolean from true to false, or vice versa. 
-
-`any` will return `true` if there are any `true` values in a array sequence, and `all` will return true if _all_ elements in an array are true.
-
-`any_c(condition)` and `all_c(condition)` are like `any` and `all` but they take a condition expression that is used against each element to determine if it's `true`. Note: in `jq` you can simply pass a condition to `any` or `all` and it simply works - `yq` isn't that clever..yet
-
-These are most commonly used with the `select` operator to filter particular nodes.
+The `or` and `and` operators take two parameters and return a boolean result. `not` flips a boolean from true to false, or vice versa. These are most commonly used with the `select` operator to filter particular nodes.
--- a/pkg/yqlib/doc/headers/Collect
+++ b/pkg/yqlib/doc/headers/Collect
--- a/pkg/yqlib/doc/headers/Comment
+++ b/pkg/yqlib/doc/headers/Comment
@ -1,11 +1 @@
-Use these comment operators to set or retrieve comments.
-
-Like the `=` and `|=` assign operators, the same syntax applies when updating comments:
-
-
-### plain form: `=`
-This will assign the LHS nodes comments to the expression on the RHS. The RHS is run against the matching nodes in the pipeline
-
-### relative form: `|=` 
-Similar to the plain form, however the RHS evaluates against each matching LHS node! This is useful if you want to set the comments as a relative expression of the node, for instance its value or path.
-
+Use these comment operators to set or retrieve comments.
--- a/pkg/yqlib/doc/headers/Document
+++ b/pkg/yqlib/doc/headers/Document
@ -1 +1 @@
-Use the `documentIndex` operator (or the `di` shorthand) to select nodes of a particular document.
+Use the `documentIndex` operator to select nodes of a particular document.
--- a/pkg/yqlib/doc/headers/Entries.md
+++ b/pkg/yqlib/doc/headers/Entries.md
@ -1 +0,0 @@
-Similar to the same named functions in `jq` these functions convert to/from an object and an array of key-value pairs. This is most useful for performing operations on keys of maps.
--- a/pkg/yqlib/doc/headers/Env
+++ b/pkg/yqlib/doc/headers/Env
@ -1,2 +0,0 @@
-This operator is used to handle environment variables usage in path expressions. While environment variables can, of course, be passed in via your CLI with string interpolation, this often comes with complex quote escaping and can be tricky to write and read. Note that there are two forms, `env` which will parse the environment variable as a yaml (be it a map, array, string, number of boolean) and `strenv` which will always parse the argument as a string.
-
--- a/pkg/yqlib/doc/headers/Keys.md
+++ b/pkg/yqlib/doc/headers/Keys.md
@ -1,3 +0,0 @@
-# Keys
-
-Use the `keys` operator to return map keys or array indices. 
--- a/pkg/yqlib/doc/headers/Multiply
+++ b/pkg/yqlib/doc/headers/Multiply
@ -1,20 +0,0 @@
-Like the multiple operator in jq, depending on the operands, this multiply operator will do different things. Currently numbers, arrays and objects are supported.
-
-## Objects and arrays - merging
-Objects are merged deeply matching on matching keys. By default, array values override and are not deeply merged.
-
-Note that when merging objects, this operator returns the merged object (not the parent). This will be clearer in the examples below.
-
-### Merge Flags
-You can control how objects are merged by using one or more of the following flags. Multiple flags can be used together, e.g. `.a *+? .b`.  See examples below
-
- `+` to append arrays
- `?` to only merge existing fields
- `d` to deeply merge arrays
-
-### Merging files
-Note the use of `eval-all` to ensure all documents are loaded into memory.
-
-```bash
-yq eval-all 'select(fileIndex == 0) * select(fileIndex == 1)' file1.yaml file2.yaml
-```
--- a/pkg/yqlib/doc/headers/Multiply.md
+++ b/pkg/yqlib/doc/headers/Multiply.md
@ -0,0 +1,14 @@
+Like the multiple operator in `jq`, depending on the operands, this multiply operator will do different things. Currently only objects are supported, which have the effect of merging the RHS into the LHS.
+
+Upcoming versions of `yq` will add support for other types of multiplication (numbers, strings).
+
+To concatenate when merging objects, use the `*+` form (see examples below). This will recursively merge objects, appending arrays when it encounters them.
+
+Note that when merging objects, this operator returns the merged object (not the parent). This will be clearer in the examples below.
+
+## Merging files
+Note the use of eval-all to ensure all documents are loaded into memory.
+
+```bash
+yq eval-all 'select(fileIndex == 0) * select(fileIndex == 1)' file1.yaml file2.yaml
+```
--- a/pkg/yqlib/doc/headers/Recursive
+++ b/pkg/yqlib/doc/headers/Recursive
@ -1,4 +1,4 @@
-This operator recursively matches (or globs) all children nodes given of a particular element, including that node itself. This is most often used to apply a filter recursively against all matches. It can be used in either the 
+This operator recursively matches all children nodes given of a particular element, including that node itself. This is most often used to apply a filter recursively against all matches. It can be used in either the 

 ## match values form `..`
 This will, like the `jq` equivalent, recursively match all _value_ nodes. Use it to find/manipulate particular values.
--- a/pkg/yqlib/doc/headers/Reduce.md
+++ b/pkg/yqlib/doc/headers/Reduce.md
@ -1,21 +0,0 @@
-Reduce is a powerful way to process a collection of data into a new form.
-
-```
-<exp> as $<name> ireduce (<init>; <block>)
-```
-
-e.g.
-
-```
-.[] as $item ireduce (0; . + $item)
-```
-
-On the LHS we are configuring the collection of items that will be reduced `<exp>` as well as what each element will be called `$<name>`. Note that the array has been splatted into its individual elements.
-
-On the RHS there is `<init>`, the starting value of the accumulator and `<block>`, the expression that will update the accumulator for each element in the collection. Note that within the block expression, `.` will evaluate to the current value of the accumulator. 
-
-## yq vs jq syntax
-Reduce syntax in `yq` is a little different from `jq` - as `yq` (currently) isn't as sophisticated as `jq` and its only supports infix notation (e.g. a + b, where the operator is in the middle of the two parameters) - where as `jq` uses a mix of infix notation with _prefix_ notation (e.g. `reduce a b` is like writing `+ a b`).
-
-To that end, the reduce operator is called `ireduce` for backwards compatability if a `jq` like prefix version of `reduce` is ever added.
-
--- a/pkg/yqlib/doc/headers/Split
+++ b/pkg/yqlib/doc/headers/Split
@ -1,3 +0,0 @@
-# Split into Documents
-
-This operator splits all matches into separate documents
--- a/pkg/yqlib/doc/headers/String
+++ b/pkg/yqlib/doc/headers/String
@ -1 +0,0 @@
-# String Operators
--- a/pkg/yqlib/doc/headers/Traverse.md
+++ b/pkg/yqlib/doc/headers/Traverse.md
--- a/pkg/yqlib/doc/headers/Unique.md
+++ b/pkg/yqlib/doc/headers/Unique.md
@ -1 +0,0 @@
-This is used to filter out duplicated items in an array.
--- a/pkg/yqlib/doc/headers/Variable
+++ b/pkg/yqlib/doc/headers/Variable
@ -1 +0,0 @@
-For more complex scenarios, variables can be used to hold values of expression to be used in other expressions.
--- a/pkg/yqlib/encoder.go
+++ b/pkg/yqlib/encoder.go
@ -50,7 +50,7 @@ func (ye *yamlEncoder) Encode(node *yaml.Node) error {
 	}

 	if ye.colorise {
-		return colorizeAndPrint(tempBuffer.Bytes(), ye.destination)
+		return ColorizeAndPrint(tempBuffer.Bytes(), ye.destination)
 	}
 	return nil
 }
@ -76,8 +76,6 @@ func mapKeysToStrings(node *yaml.Node) {

 func NewJsonEncoder(destination io.Writer, indent int) Encoder {
 	var encoder = json.NewEncoder(destination)
-	encoder.SetEscapeHTML(false) // do not escape html chars e.g. &, <, >
-
 	var indentString = ""

 	for index := 0; index < indent; index++ {
@ -155,15 +153,11 @@ func (o *orderedMap) UnmarshalJSON(data []byte) error {
 }

 func (o orderedMap) MarshalJSON() ([]byte, error) {
+	if o.kv == nil {
+		return json.Marshal(o.altVal)
+	}
 	buf := new(bytes.Buffer)
 	enc := json.NewEncoder(buf)
-	enc.SetEscapeHTML(false) // do not escape html chars e.g. &, <, >
-	if o.kv == nil {
-		if err := enc.Encode(o.altVal); err != nil {
-			return nil, err
-		}
-		return buf.Bytes(), nil
-	}
 	buf.WriteByte('{')
 	for idx, el := range o.kv {
 		if err := enc.Encode(el.K); err != nil {
--- a/pkg/yqlib/encoder_test.go
+++ b/pkg/yqlib/encoder_test.go
@ -9,11 +9,29 @@ import (
 	"github.com/mikefarah/yq/v4/test"
 )

-func yamlToJson(sampleYaml string, indent int) string {
+var sampleYaml = `zabbix: winner
+apple: great
+banana:
+- {cobra: kai, angus: bob}
+`
+
+var expectedJson = `{
+  "zabbix": "winner",
+  "apple": "great",
+  "banana": [
+    {
+      "cobra": "kai",
+      "angus": "bob"
+    }
+  ]
+}
+`
+
+func TestJsonEncoderPreservesObjectOrder(t *testing.T) {
 	var output bytes.Buffer
 	writer := bufio.NewWriter(&output)

-	var jsonEncoder = NewJsonEncoder(writer, indent)
+	var jsonEncoder = NewJsonEncoder(writer, 2)
 	inputs, err := readDocuments(strings.NewReader(sampleYaml), "sample.yml", 0)
 	if err != nil {
 		panic(err)
@ -24,33 +42,6 @@ func yamlToJson(sampleYaml string, indent int) string {
 		panic(err)
 	}
 	writer.Flush()
+	test.AssertResult(t, expectedJson, output.String())

-	return strings.TrimSuffix(output.String(), "\n")
-}
-
-func TestJsonEncoderPreservesObjectOrder(t *testing.T) {
-	var sampleYaml = `zabbix: winner
-apple: great
-banana:
- {cobra: kai, angus: bob}
-`
-	var expectedJson = `{
-  "zabbix": "winner",
-  "apple": "great",
-  "banana": [
-    {
-      "cobra": "kai",
-      "angus": "bob"
-    }
-  ]
-}`
-	var actualJson = yamlToJson(sampleYaml, 2)
-	test.AssertResult(t, expectedJson, actualJson)
-}
-
-func TestJsonEncoderDoesNotEscapeHTMLChars(t *testing.T) {
-	var sampleYaml = `build: "( ./lint && ./format && ./compile ) < src.code"`
-	var expectedJson = `{"build":"( ./lint && ./format && ./compile ) < src.code"}`
-	var actualJson = yamlToJson(sampleYaml, 0)
-	test.AssertResult(t, expectedJson, actualJson)
 }
--- a/pkg/yqlib/expression_postfix.go
+++ b/pkg/yqlib/expression_postfix.go
@ -1,109 +0,0 @@
-package yqlib
-
-import (
-	"errors"
-
-	logging "gopkg.in/op/go-logging.v1"
-)
-
-type expressionPostFixer interface {
-	ConvertToPostfix([]*token) ([]*Operation, error)
-}
-
-type expressionPostFixerImpl struct {
-}
-
-func newExpressionPostFixer() expressionPostFixer {
-	return &expressionPostFixerImpl{}
-}
-
-func popOpToResult(opStack []*token, result []*Operation) ([]*token, []*Operation) {
-	var newOp *token
-	opStack, newOp = opStack[0:len(opStack)-1], opStack[len(opStack)-1]
-	log.Debugf("popped %v from opstack to results", newOp.toString(true))
-	return opStack, append(result, newOp.Operation)
-}
-
-func (p *expressionPostFixerImpl) ConvertToPostfix(infixTokens []*token) ([]*Operation, error) {
-	var result []*Operation
-	// surround the whole thing with brackets
-	var opStack = []*token{{TokenType: openBracket}}
-	var tokens = append(infixTokens, &token{TokenType: closeBracket})
-
-	for _, currentToken := range tokens {
-		log.Debugf("postfix processing currentToken %v", currentToken.toString(true))
-		switch currentToken.TokenType {
-		case openBracket, openCollect, openCollectObject:
-			opStack = append(opStack, currentToken)
-			log.Debugf("put %v onto the opstack", currentToken.toString(true))
-		case closeCollect, closeCollectObject:
-			var opener tokenType = openCollect
-			var collectOperator *operationType = collectOpType
-			if currentToken.TokenType == closeCollectObject {
-				opener = openCollectObject
-				collectOperator = collectObjectOpType
-			}
-
-			for len(opStack) > 0 && opStack[len(opStack)-1].TokenType != opener {
-				opStack, result = popOpToResult(opStack, result)
-			}
-			if len(opStack) == 0 {
-				return nil, errors.New("Bad path expression, got close collect brackets without matching opening bracket")
-			}
-			// now we should have [ as the last element on the opStack, get rid of it
-			opStack = opStack[0 : len(opStack)-1]
-			log.Debugf("deleteing open bracket from opstack")
-
-			//and append a collect to the result
-			// hack - see if there's the optional traverse flag
-			// on the close op - move it to the collect op.
-			// allows for .["cat"]?
-			prefs := traversePreferences{}
-			closeTokenMatch := string(currentToken.Match.Bytes)
-			if closeTokenMatch[len(closeTokenMatch)-1:] == "?" {
-				prefs.OptionalTraverse = true
-			}
-			result = append(result, &Operation{OperationType: collectOperator, Preferences: prefs})
-			log.Debugf("put collect onto the result")
-			result = append(result, &Operation{OperationType: shortPipeOpType})
-			log.Debugf("put shortpipe onto the result")
-
-			//traverseArrayCollect is a sneaky op that needs to be included too
-			//when closing a []
-			if len(opStack) > 0 && opStack[len(opStack)-1].Operation != nil && opStack[len(opStack)-1].Operation.OperationType == traverseArrayOpType {
-				opStack, result = popOpToResult(opStack, result)
-			}
-
-		case closeBracket:
-			for len(opStack) > 0 && opStack[len(opStack)-1].TokenType != openBracket {
-				opStack, result = popOpToResult(opStack, result)
-			}
-			if len(opStack) == 0 {
-				return nil, errors.New("Bad path expression, got close brackets without matching opening bracket")
-			}
-			// now we should have ( as the last element on the opStack, get rid of it
-			opStack = opStack[0 : len(opStack)-1]
-
-		default:
-			var currentPrecedence = currentToken.Operation.OperationType.Precedence
-			// pop off higher precedent operators onto the result
-			for len(opStack) > 0 &&
-				opStack[len(opStack)-1].TokenType == operationToken &&
-				opStack[len(opStack)-1].Operation.OperationType.Precedence > currentPrecedence {
-				opStack, result = popOpToResult(opStack, result)
-			}
-			// add this operator to the opStack
-			opStack = append(opStack, currentToken)
-			log.Debugf("put %v onto the opstack", currentToken.toString(true))
-		}
-	}
-
-	if log.IsEnabledFor(logging.DEBUG) {
-		log.Debugf("PostFix Result:")
-		for _, currentToken := range result {
-			log.Debugf("> %v", currentToken.toString())
-		}
-	}
-
-	return result, nil
-}
--- a/pkg/yqlib/expression_processing_test.go
+++ b/pkg/yqlib/expression_processing_test.go
@ -1,276 +0,0 @@
-package yqlib
-
-import (
-	"fmt"
-	"testing"
-
-	"github.com/mikefarah/yq/v4/test"
-)
-
-var pathTests = []struct {
-	path            string
-	expectedTokens  []interface{}
-	expectedPostFix []interface{}
-}{
-	{
-		`.[0]`,
-		append(make([]interface{}, 0), "SELF", "TRAVERSE_ARRAY", "[", "0 (int64)", "]"),
-		append(make([]interface{}, 0), "SELF", "0 (int64)", "COLLECT", "SHORT_PIPE", "TRAVERSE_ARRAY"),
-	},
-	{
-		`.[0][1]`,
-		append(make([]interface{}, 0), "SELF", "TRAVERSE_ARRAY", "[", "0 (int64)", "]", "TRAVERSE_ARRAY", "[", "1 (int64)", "]"),
-		append(make([]interface{}, 0), "SELF", "0 (int64)", "COLLECT", "SHORT_PIPE", "TRAVERSE_ARRAY", "1 (int64)", "COLLECT", "SHORT_PIPE", "TRAVERSE_ARRAY"),
-	},
-	{
-		`"\""`,
-		append(make([]interface{}, 0), "\" (string)"),
-		append(make([]interface{}, 0), "\" (string)"),
-	},
-	{
-		`[]|join(".")`,
-		append(make([]interface{}, 0), "[", "EMPTY", "]", "PIPE", "JOIN", "(", ". (string)", ")"),
-		append(make([]interface{}, 0), "EMPTY", "COLLECT", "SHORT_PIPE", ". (string)", "JOIN", "PIPE"),
-	},
-	{
-		`{"cool": .b or .c}`,
-		append(make([]interface{}, 0), "{", "cool (string)", "CREATE_MAP", "b", "OR", "c", "}"),
-		append(make([]interface{}, 0), "cool (string)", "b", "c", "OR", "CREATE_MAP", "COLLECT_OBJECT", "SHORT_PIPE"),
-	},
-	{
-		`{"cool": []|join(".")}`,
-		append(make([]interface{}, 0), "{", "cool (string)", "CREATE_MAP", "[", "EMPTY", "]", "PIPE", "JOIN", "(", ". (string)", ")", "}"),
-		append(make([]interface{}, 0), "cool (string)", "EMPTY", "COLLECT", "SHORT_PIPE", ". (string)", "JOIN", "PIPE", "CREATE_MAP", "COLLECT_OBJECT", "SHORT_PIPE"),
-	},
-	{
-		`.a as $item ireduce (0; . + $item)`, // note - add code to shuffle reduce to this position for postfix
-		append(make([]interface{}, 0), "a", "ASSIGN_VARIABLE", "GET_VARIABLE", "REDUCE", "(", "0 (int64)", "BLOCK", "SELF", "ADD", "GET_VARIABLE", ")"),
-		append(make([]interface{}, 0), "a", "GET_VARIABLE", "ASSIGN_VARIABLE", "0 (int64)", "SELF", "GET_VARIABLE", "ADD", "BLOCK", "REDUCE"),
-	},
-	{
-		`.a | .b | .c`,
-		append(make([]interface{}, 0), "a", "PIPE", "b", "PIPE", "c"),
-		append(make([]interface{}, 0), "a", "b", "c", "PIPE", "PIPE"),
-	},
-	{
-		`[]`,
-		append(make([]interface{}, 0), "[", "EMPTY", "]"),
-		append(make([]interface{}, 0), "EMPTY", "COLLECT", "SHORT_PIPE"),
-	},
-	{
-		`{}`,
-		append(make([]interface{}, 0), "{", "EMPTY", "}"),
-		append(make([]interface{}, 0), "EMPTY", "COLLECT_OBJECT", "SHORT_PIPE"),
-	},
-	{
-		`[{}]`,
-		append(make([]interface{}, 0), "[", "{", "EMPTY", "}", "]"),
-		append(make([]interface{}, 0), "EMPTY", "COLLECT_OBJECT", "SHORT_PIPE", "COLLECT", "SHORT_PIPE"),
-	},
-	{
-		`.realnames as $names | $names["anon"]`,
-		append(make([]interface{}, 0), "realnames", "ASSIGN_VARIABLE", "GET_VARIABLE", "PIPE", "GET_VARIABLE", "TRAVERSE_ARRAY", "[", "anon (string)", "]"),
-		append(make([]interface{}, 0), "realnames", "GET_VARIABLE", "ASSIGN_VARIABLE", "GET_VARIABLE", "anon (string)", "COLLECT", "SHORT_PIPE", "TRAVERSE_ARRAY", "PIPE"),
-	},
-	{
-		`.b[.a]`,
-		append(make([]interface{}, 0), "b", "TRAVERSE_ARRAY", "[", "a", "]"),
-		append(make([]interface{}, 0), "b", "a", "COLLECT", "SHORT_PIPE", "TRAVERSE_ARRAY"),
-	},
-	{
-		`.b[.a]?`,
-		append(make([]interface{}, 0), "b", "TRAVERSE_ARRAY", "[", "a", "]"),
-		append(make([]interface{}, 0), "b", "a", "COLLECT", "SHORT_PIPE", "TRAVERSE_ARRAY"),
-	},
-	{
-		`.[]`,
-		append(make([]interface{}, 0), "SELF", "TRAVERSE_ARRAY", "[", "EMPTY", "]"),
-		append(make([]interface{}, 0), "SELF", "EMPTY", "COLLECT", "SHORT_PIPE", "TRAVERSE_ARRAY"),
-	},
-	{
-		`.a[]`,
-		append(make([]interface{}, 0), "a", "TRAVERSE_ARRAY", "[", "EMPTY", "]"),
-		append(make([]interface{}, 0), "a", "EMPTY", "COLLECT", "SHORT_PIPE", "TRAVERSE_ARRAY"),
-	},
-	{
-		`.a[]?`,
-		append(make([]interface{}, 0), "a", "TRAVERSE_ARRAY", "[", "EMPTY", "]"),
-		append(make([]interface{}, 0), "a", "EMPTY", "COLLECT", "SHORT_PIPE", "TRAVERSE_ARRAY"),
-	},
-	{
-		`.a.[]`,
-		append(make([]interface{}, 0), "a", "TRAVERSE_ARRAY", "[", "EMPTY", "]"),
-		append(make([]interface{}, 0), "a", "EMPTY", "COLLECT", "SHORT_PIPE", "TRAVERSE_ARRAY"),
-	},
-	{
-		`.a[0]`,
-		append(make([]interface{}, 0), "a", "TRAVERSE_ARRAY", "[", "0 (int64)", "]"),
-		append(make([]interface{}, 0), "a", "0 (int64)", "COLLECT", "SHORT_PIPE", "TRAVERSE_ARRAY"),
-	},
-	{
-		`.a[0]?`,
-		append(make([]interface{}, 0), "a", "TRAVERSE_ARRAY", "[", "0 (int64)", "]"),
-		append(make([]interface{}, 0), "a", "0 (int64)", "COLLECT", "SHORT_PIPE", "TRAVERSE_ARRAY"),
-	},
-	{
-		`.a.[0]`,
-		append(make([]interface{}, 0), "a", "TRAVERSE_ARRAY", "[", "0 (int64)", "]"),
-		append(make([]interface{}, 0), "a", "0 (int64)", "COLLECT", "SHORT_PIPE", "TRAVERSE_ARRAY"),
-	},
-	{
-		`.a[].c`,
-		append(make([]interface{}, 0), "a", "TRAVERSE_ARRAY", "[", "EMPTY", "]", "SHORT_PIPE", "c"),
-		append(make([]interface{}, 0), "a", "EMPTY", "COLLECT", "SHORT_PIPE", "TRAVERSE_ARRAY", "c", "SHORT_PIPE"),
-	},
-	{
-		`[3]`,
-		append(make([]interface{}, 0), "[", "3 (int64)", "]"),
-		append(make([]interface{}, 0), "3 (int64)", "COLLECT", "SHORT_PIPE"),
-	},
-	{
-		`.key.array + .key.array2`,
-		append(make([]interface{}, 0), "key", "SHORT_PIPE", "array", "ADD", "key", "SHORT_PIPE", "array2"),
-		append(make([]interface{}, 0), "key", "array", "SHORT_PIPE", "key", "array2", "SHORT_PIPE", "ADD"),
-	},
-	{
-		`.key.array * .key.array2`,
-		append(make([]interface{}, 0), "key", "SHORT_PIPE", "array", "MULTIPLY", "key", "SHORT_PIPE", "array2"),
-		append(make([]interface{}, 0), "key", "array", "SHORT_PIPE", "key", "array2", "SHORT_PIPE", "MULTIPLY"),
-	},
-	{
-		`.key.array // .key.array2`,
-		append(make([]interface{}, 0), "key", "SHORT_PIPE", "array", "ALTERNATIVE", "key", "SHORT_PIPE", "array2"),
-		append(make([]interface{}, 0), "key", "array", "SHORT_PIPE", "key", "array2", "SHORT_PIPE", "ALTERNATIVE"),
-	},
-	{
-		`.a | .[].b == "apple"`,
-		append(make([]interface{}, 0), "a", "PIPE", "SELF", "TRAVERSE_ARRAY", "[", "EMPTY", "]", "SHORT_PIPE", "b", "EQUALS", "apple (string)"),
-		append(make([]interface{}, 0), "a", "SELF", "EMPTY", "COLLECT", "SHORT_PIPE", "TRAVERSE_ARRAY", "b", "SHORT_PIPE", "apple (string)", "EQUALS", "PIPE"),
-	},
-	{
-		`(.a | .[].b) == "apple"`,
-		append(make([]interface{}, 0), "(", "a", "PIPE", "SELF", "TRAVERSE_ARRAY", "[", "EMPTY", "]", "SHORT_PIPE", "b", ")", "EQUALS", "apple (string)"),
-		append(make([]interface{}, 0), "a", "SELF", "EMPTY", "COLLECT", "SHORT_PIPE", "TRAVERSE_ARRAY", "b", "SHORT_PIPE", "PIPE", "apple (string)", "EQUALS"),
-	},
-	{
-		`.[] | select(. == "*at")`,
-		append(make([]interface{}, 0), "SELF", "TRAVERSE_ARRAY", "[", "EMPTY", "]", "PIPE", "SELECT", "(", "SELF", "EQUALS", "*at (string)", ")"),
-		append(make([]interface{}, 0), "SELF", "EMPTY", "COLLECT", "SHORT_PIPE", "TRAVERSE_ARRAY", "SELF", "*at (string)", "EQUALS", "SELECT", "PIPE"),
-	},
-	{
-		`[true]`,
-		append(make([]interface{}, 0), "[", "true (bool)", "]"),
-		append(make([]interface{}, 0), "true (bool)", "COLLECT", "SHORT_PIPE"),
-	},
-	{
-		`[true, false]`,
-		append(make([]interface{}, 0), "[", "true (bool)", "UNION", "false (bool)", "]"),
-		append(make([]interface{}, 0), "true (bool)", "false (bool)", "UNION", "COLLECT", "SHORT_PIPE"),
-	},
-	{
-		`"mike": .a`,
-		append(make([]interface{}, 0), "mike (string)", "CREATE_MAP", "a"),
-		append(make([]interface{}, 0), "mike (string)", "a", "CREATE_MAP"),
-	},
-	{
-		`.a: "mike"`,
-		append(make([]interface{}, 0), "a", "CREATE_MAP", "mike (string)"),
-		append(make([]interface{}, 0), "a", "mike (string)", "CREATE_MAP"),
-	},
-	{
-		`{"mike": .a}`,
-		append(make([]interface{}, 0), "{", "mike (string)", "CREATE_MAP", "a", "}"),
-		append(make([]interface{}, 0), "mike (string)", "a", "CREATE_MAP", "COLLECT_OBJECT", "SHORT_PIPE"),
-	},
-	{
-		`{.a: "mike"}`,
-		append(make([]interface{}, 0), "{", "a", "CREATE_MAP", "mike (string)", "}"),
-		append(make([]interface{}, 0), "a", "mike (string)", "CREATE_MAP", "COLLECT_OBJECT", "SHORT_PIPE"),
-	},
-	{
-		`{.a: .c, .b.[]: .f.g[]}`,
-		append(make([]interface{}, 0), "{", "a", "CREATE_MAP", "c", "UNION", "b", "TRAVERSE_ARRAY", "[", "EMPTY", "]", "CREATE_MAP", "f", "SHORT_PIPE", "g", "TRAVERSE_ARRAY", "[", "EMPTY", "]", "}"),
-		append(make([]interface{}, 0), "a", "c", "CREATE_MAP", "b", "EMPTY", "COLLECT", "SHORT_PIPE", "TRAVERSE_ARRAY", "f", "g", "EMPTY", "COLLECT", "SHORT_PIPE", "TRAVERSE_ARRAY", "SHORT_PIPE", "CREATE_MAP", "UNION", "COLLECT_OBJECT", "SHORT_PIPE"),
-	},
-	{
-		`explode(.a.b)`,
-		append(make([]interface{}, 0), "EXPLODE", "(", "a", "SHORT_PIPE", "b", ")"),
-		append(make([]interface{}, 0), "a", "b", "SHORT_PIPE", "EXPLODE"),
-	},
-	{
-		`.a.b style="folded"`,
-		append(make([]interface{}, 0), "a", "SHORT_PIPE", "b", "ASSIGN_STYLE", "folded (string)"),
-		append(make([]interface{}, 0), "a", "b", "SHORT_PIPE", "folded (string)", "ASSIGN_STYLE"),
-	},
-	{
-		`tag == "str"`,
-		append(make([]interface{}, 0), "GET_TAG", "EQUALS", "str (string)"),
-		append(make([]interface{}, 0), "GET_TAG", "str (string)", "EQUALS"),
-	},
-	{
-		`. tag= "str"`,
-		append(make([]interface{}, 0), "SELF", "ASSIGN_TAG", "str (string)"),
-		append(make([]interface{}, 0), "SELF", "str (string)", "ASSIGN_TAG"),
-	},
-	{
-		`lineComment == "str"`,
-		append(make([]interface{}, 0), "GET_COMMENT", "EQUALS", "str (string)"),
-		append(make([]interface{}, 0), "GET_COMMENT", "str (string)", "EQUALS"),
-	},
-	{
-		`. lineComment= "str"`,
-		append(make([]interface{}, 0), "SELF", "ASSIGN_COMMENT", "str (string)"),
-		append(make([]interface{}, 0), "SELF", "str (string)", "ASSIGN_COMMENT"),
-	},
-	{
-		`. lineComment |= "str"`,
-		append(make([]interface{}, 0), "SELF", "ASSIGN_COMMENT", "str (string)"),
-		append(make([]interface{}, 0), "SELF", "str (string)", "ASSIGN_COMMENT"),
-	},
-	{
-		`.a.b tag="!!str"`,
-		append(make([]interface{}, 0), "a", "SHORT_PIPE", "b", "ASSIGN_TAG", "!!str (string)"),
-		append(make([]interface{}, 0), "a", "b", "SHORT_PIPE", "!!str (string)", "ASSIGN_TAG"),
-	},
-	{
-		`""`,
-		append(make([]interface{}, 0), " (string)"),
-		append(make([]interface{}, 0), " (string)"),
-	},
-	{
-		`.foo* | (. style="flow")`,
-		append(make([]interface{}, 0), "foo*", "PIPE", "(", "SELF", "ASSIGN_STYLE", "flow (string)", ")"),
-		append(make([]interface{}, 0), "foo*", "SELF", "flow (string)", "ASSIGN_STYLE", "PIPE"),
-	},
-}
-
-var tokeniser = newExpressionTokeniser()
-var postFixer = newExpressionPostFixer()
-
-func TestPathParsing(t *testing.T) {
-	for _, tt := range pathTests {
-		tokens, err := tokeniser.Tokenise(tt.path)
-		if err != nil {
-			t.Error(tt.path, err)
-		}
-		var tokenValues []interface{}
-		for _, token := range tokens {
-			tokenValues = append(tokenValues, token.toString(false))
-		}
-		test.AssertResultComplexWithContext(t, tt.expectedTokens, tokenValues, fmt.Sprintf("tokenise: %v", tt.path))
-
-		results, errorP := postFixer.ConvertToPostfix(tokens)
-
-		var readableResults []interface{}
-		for _, token := range results {
-			readableResults = append(readableResults, token.toString())
-		}
-
-		if errorP != nil {
-			t.Error(tt.path, err)
-		}
-
-		test.AssertResultComplexWithContext(t, tt.expectedPostFix, readableResults, fmt.Sprintf("postfix: %v", tt.path))
-
-	}
-}
--- a/pkg/yqlib/expression_tokeniser.go
+++ b/pkg/yqlib/expression_tokeniser.go
@ -1,474 +0,0 @@
-package yqlib
-
-import (
-	"fmt"
-	"strconv"
-	"strings"
-
-	lex "github.com/timtadh/lexmachine"
-	"github.com/timtadh/lexmachine/machines"
-)
-
-func skip(*lex.Scanner, *machines.Match) (interface{}, error) {
-	return nil, nil
-}
-
-type tokenType uint32
-
-const (
-	operationToken = 1 << iota
-	openBracket
-	closeBracket
-	openCollect
-	closeCollect
-	openCollectObject
-	closeCollectObject
-	traverseArrayCollect
-)
-
-type token struct {
-	TokenType            tokenType
-	Operation            *Operation
-	AssignOperation      *Operation      // e.g. tag (GetTag) op becomes AssignTag if '=' follows it
-	CheckForPostTraverse bool            // e.g. [1]cat should really be [1].cat
-	Match                *machines.Match // match that created this token
-
-}
-
-func (t *token) toString(detail bool) string {
-	if t.TokenType == operationToken {
-		if detail {
-			return fmt.Sprintf("%v (%v)", t.Operation.toString(), t.Operation.OperationType.Precedence)
-		}
-		return t.Operation.toString()
-	} else if t.TokenType == openBracket {
-		return "("
-	} else if t.TokenType == closeBracket {
-		return ")"
-	} else if t.TokenType == openCollect {
-		return "["
-	} else if t.TokenType == closeCollect {
-		return "]"
-	} else if t.TokenType == openCollectObject {
-		return "{"
-	} else if t.TokenType == closeCollectObject {
-		return "}"
-	} else if t.TokenType == traverseArrayCollect {
-		return ".["
-
-	} else {
-		return "NFI"
-	}
-}
-
-func pathToken(wrapped bool) lex.Action {
-	return func(s *lex.Scanner, m *machines.Match) (interface{}, error) {
-		value := string(m.Bytes)
-		prefs := traversePreferences{}
-
-		if value[len(value)-1:] == "?" {
-			prefs.OptionalTraverse = true
-			value = value[:len(value)-1]
-		}
-
-		value = value[1:]
-		if wrapped {
-			value = unwrap(value)
-		}
-		log.Debug("PathToken %v", value)
-		op := &Operation{OperationType: traversePathOpType, Value: value, StringValue: value, Preferences: prefs}
-		return &token{TokenType: operationToken, Operation: op, CheckForPostTraverse: true}, nil
-	}
-}
-
-func opToken(op *operationType) lex.Action {
-	return opTokenWithPrefs(op, nil, nil)
-}
-
-func opAssignableToken(opType *operationType, assignOpType *operationType) lex.Action {
-	return opTokenWithPrefs(opType, assignOpType, nil)
-}
-
-func assignOpToken(updateAssign bool) lex.Action {
-	return func(s *lex.Scanner, m *machines.Match) (interface{}, error) {
-		log.Debug("assignOpToken %v", string(m.Bytes))
-		value := string(m.Bytes)
-		op := &Operation{OperationType: assignOpType, Value: assignOpType.Type, StringValue: value, UpdateAssign: updateAssign}
-		return &token{TokenType: operationToken, Operation: op}, nil
-	}
-}
-
-func multiplyWithPrefs() lex.Action {
-	return func(s *lex.Scanner, m *machines.Match) (interface{}, error) {
-		prefs := multiplyPreferences{}
-		options := string(m.Bytes)
-		if strings.Contains(options, "+") {
-			prefs.AppendArrays = true
-		}
-		if strings.Contains(options, "?") {
-			prefs.TraversePrefs = traversePreferences{DontAutoCreate: true}
-		}
-		if strings.Contains(options, "d") {
-			prefs.DeepMergeArrays = true
-		}
-		op := &Operation{OperationType: multiplyOpType, Value: multiplyOpType.Type, StringValue: options, Preferences: prefs}
-		return &token{TokenType: operationToken, Operation: op}, nil
-	}
-}
-
-func opTokenWithPrefs(op *operationType, assignOpType *operationType, preferences interface{}) lex.Action {
-	return func(s *lex.Scanner, m *machines.Match) (interface{}, error) {
-		log.Debug("opTokenWithPrefs %v", string(m.Bytes))
-		value := string(m.Bytes)
-		op := &Operation{OperationType: op, Value: op.Type, StringValue: value, Preferences: preferences}
-		var assign *Operation
-		if assignOpType != nil {
-			assign = &Operation{OperationType: assignOpType, Value: assignOpType.Type, StringValue: value, Preferences: preferences}
-		}
-		return &token{TokenType: operationToken, Operation: op, AssignOperation: assign}, nil
-	}
-}
-
-func assignAllCommentsOp(updateAssign bool) lex.Action {
-	return func(s *lex.Scanner, m *machines.Match) (interface{}, error) {
-		log.Debug("assignAllCommentsOp %v", string(m.Bytes))
-		value := string(m.Bytes)
-		op := &Operation{
-			OperationType: assignCommentOpType,
-			Value:         assignCommentOpType.Type,
-			StringValue:   value,
-			UpdateAssign:  updateAssign,
-			Preferences:   commentOpPreferences{LineComment: true, HeadComment: true, FootComment: true},
-		}
-		return &token{TokenType: operationToken, Operation: op}, nil
-	}
-}
-
-func literalToken(pType tokenType, checkForPost bool) lex.Action {
-	return func(s *lex.Scanner, m *machines.Match) (interface{}, error) {
-		return &token{TokenType: pType, CheckForPostTraverse: checkForPost, Match: m}, nil
-	}
-}
-
-func unwrap(value string) string {
-	return value[1 : len(value)-1]
-}
-
-func numberValue() lex.Action {
-	return func(s *lex.Scanner, m *machines.Match) (interface{}, error) {
-		var numberString = string(m.Bytes)
-		var number, errParsingInt = strconv.ParseInt(numberString, 10, 64) // nolint
-		if errParsingInt != nil {
-			return nil, errParsingInt
-		}
-
-		return &token{TokenType: operationToken, Operation: createValueOperation(number, numberString)}, nil
-	}
-}
-
-func floatValue() lex.Action {
-	return func(s *lex.Scanner, m *machines.Match) (interface{}, error) {
-		var numberString = string(m.Bytes)
-		var number, errParsingInt = strconv.ParseFloat(numberString, 64) // nolint
-		if errParsingInt != nil {
-			return nil, errParsingInt
-		}
-		return &token{TokenType: operationToken, Operation: createValueOperation(number, numberString)}, nil
-	}
-}
-
-func booleanValue(val bool) lex.Action {
-	return func(s *lex.Scanner, m *machines.Match) (interface{}, error) {
-		return &token{TokenType: operationToken, Operation: createValueOperation(val, string(m.Bytes))}, nil
-	}
-}
-
-func stringValue(wrapped bool) lex.Action {
-	return func(s *lex.Scanner, m *machines.Match) (interface{}, error) {
-		value := string(m.Bytes)
-		if wrapped {
-			value = unwrap(value)
-		}
-		value = strings.ReplaceAll(value, "\\\"", "\"")
-		return &token{TokenType: operationToken, Operation: createValueOperation(value, value)}, nil
-	}
-}
-
-func getVariableOpToken() lex.Action {
-	return func(s *lex.Scanner, m *machines.Match) (interface{}, error) {
-		value := string(m.Bytes)
-
-		value = value[1:]
-
-		getVarOperation := createValueOperation(value, value)
-		getVarOperation.OperationType = getVariableOpType
-
-		return &token{TokenType: operationToken, Operation: getVarOperation, CheckForPostTraverse: true}, nil
-	}
-}
-
-func envOp(strenv bool) lex.Action {
-	return func(s *lex.Scanner, m *machines.Match) (interface{}, error) {
-		value := string(m.Bytes)
-		preferences := envOpPreferences{}
-
-		if strenv {
-			// strenv( )
-			value = value[7 : len(value)-1]
-			preferences.StringValue = true
-		} else {
-			//env( )
-			value = value[4 : len(value)-1]
-		}
-
-		envOperation := createValueOperation(value, value)
-		envOperation.OperationType = envOpType
-		envOperation.Preferences = preferences
-
-		return &token{TokenType: operationToken, Operation: envOperation}, nil
-	}
-}
-
-func nullValue() lex.Action {
-	return func(s *lex.Scanner, m *machines.Match) (interface{}, error) {
-		return &token{TokenType: operationToken, Operation: createValueOperation(nil, string(m.Bytes))}, nil
-	}
-}
-
-func selfToken() lex.Action {
-	return func(s *lex.Scanner, m *machines.Match) (interface{}, error) {
-		op := &Operation{OperationType: selfReferenceOpType}
-		return &token{TokenType: operationToken, Operation: op}, nil
-	}
-}
-
-func initLexer() (*lex.Lexer, error) {
-	lexer := lex.NewLexer()
-	lexer.Add([]byte(`\(`), literalToken(openBracket, false))
-	lexer.Add([]byte(`\)`), literalToken(closeBracket, true))
-
-	lexer.Add([]byte(`\.\[`), literalToken(traverseArrayCollect, false))
-	lexer.Add([]byte(`\.\.`), opTokenWithPrefs(recursiveDescentOpType, nil, recursiveDescentPreferences{RecurseArray: true,
-		TraversePreferences: traversePreferences{DontFollowAlias: true, IncludeMapKeys: false}}))
-
-	lexer.Add([]byte(`\.\.\.`), opTokenWithPrefs(recursiveDescentOpType, nil, recursiveDescentPreferences{RecurseArray: true,
-		TraversePreferences: traversePreferences{DontFollowAlias: true, IncludeMapKeys: true}}))
-
-	lexer.Add([]byte(`,`), opToken(unionOpType))
-	lexer.Add([]byte(`:\s*`), opToken(createMapOpType))
-	lexer.Add([]byte(`length`), opToken(lengthOpType))
-	lexer.Add([]byte(`sortKeys`), opToken(sortKeysOpType))
-	lexer.Add([]byte(`select`), opToken(selectOpType))
-	lexer.Add([]byte(`has`), opToken(hasOpType))
-	lexer.Add([]byte(`unique`), opToken(uniqueOpType))
-	lexer.Add([]byte(`unique_by`), opToken(uniqueByOpType))
-	lexer.Add([]byte(`explode`), opToken(explodeOpType))
-	lexer.Add([]byte(`or`), opToken(orOpType))
-	lexer.Add([]byte(`and`), opToken(andOpType))
-	lexer.Add([]byte(`not`), opToken(notOpType))
-	lexer.Add([]byte(`ireduce`), opToken(reduceOpType))
-	lexer.Add([]byte(`;`), opToken(blockOpType))
-	lexer.Add([]byte(`\/\/`), opToken(alternativeOpType))
-
-	lexer.Add([]byte(`documentIndex`), opToken(getDocumentIndexOpType))
-	lexer.Add([]byte(`di`), opToken(getDocumentIndexOpType))
-	lexer.Add([]byte(`splitDoc`), opToken(splitDocumentOpType))
-
-	lexer.Add([]byte(`join`), opToken(joinStringOpType))
-	lexer.Add([]byte(`sub`), opToken(subStringOpType))
-
-	lexer.Add([]byte(`any`), opToken(anyOpType))
-	lexer.Add([]byte(`any_c`), opToken(anyConditionOpType))
-	lexer.Add([]byte(`all`), opToken(allOpType))
-	lexer.Add([]byte(`all_c`), opToken(allConditionOpType))
-
-	lexer.Add([]byte(`split`), opToken(splitStringOpType))
-	lexer.Add([]byte(`keys`), opToken(keysOpType))
-
-	lexer.Add([]byte(`style`), opAssignableToken(getStyleOpType, assignStyleOpType))
-
-	lexer.Add([]byte(`tag`), opAssignableToken(getTagOpType, assignTagOpType))
-	lexer.Add([]byte(`anchor`), opAssignableToken(getAnchorOpType, assignAnchorOpType))
-	lexer.Add([]byte(`alias`), opAssignableToken(getAliasOptype, assignAliasOpType))
-	lexer.Add([]byte(`filename`), opToken(getFilenameOpType))
-	lexer.Add([]byte(`fileIndex`), opToken(getFileIndexOpType))
-	lexer.Add([]byte(`fi`), opToken(getFileIndexOpType))
-	lexer.Add([]byte(`path`), opToken(getPathOpType))
-	lexer.Add([]byte(`to_entries`), opToken(toEntriesOpType))
-	lexer.Add([]byte(`from_entries`), opToken(fromEntriesOpType))
-	lexer.Add([]byte(`with_entries`), opToken(withEntriesOpType))
-
-	lexer.Add([]byte(`lineComment`), opTokenWithPrefs(getCommentOpType, assignCommentOpType, commentOpPreferences{LineComment: true}))
-
-	lexer.Add([]byte(`headComment`), opTokenWithPrefs(getCommentOpType, assignCommentOpType, commentOpPreferences{HeadComment: true}))
-
-	lexer.Add([]byte(`footComment`), opTokenWithPrefs(getCommentOpType, assignCommentOpType, commentOpPreferences{FootComment: true}))
-
-	lexer.Add([]byte(`comments\s*=`), assignAllCommentsOp(false))
-	lexer.Add([]byte(`comments\s*\|=`), assignAllCommentsOp(true))
-
-	lexer.Add([]byte(`collect`), opToken(collectOpType))
-
-	lexer.Add([]byte(`\s*==\s*`), opToken(equalsOpType))
-	lexer.Add([]byte(`\s*!=\s*`), opToken(notEqualsOpType))
-	lexer.Add([]byte(`\s*=\s*`), assignOpToken(false))
-
-	lexer.Add([]byte(`del`), opToken(deleteChildOpType))
-
-	lexer.Add([]byte(`\s*\|=\s*`), assignOpToken(true))
-
-	lexer.Add([]byte("( |\t|\n|\r)+"), skip)
-
-	lexer.Add([]byte(`\."[^ "]+"\??`), pathToken(true))
-	lexer.Add([]byte(`\.[^ \}\{\:\[\],\|\.\[\(\)=]+\??`), pathToken(false))
-	lexer.Add([]byte(`\.`), selfToken())
-
-	lexer.Add([]byte(`\|`), opToken(pipeOpType))
-
-	lexer.Add([]byte(`-?\d+(\.\d+)`), floatValue())
-	lexer.Add([]byte(`-?[1-9](\.\d+)?[Ee][-+]?\d+`), floatValue())
-	lexer.Add([]byte(`-?\d+`), numberValue())
-
-	lexer.Add([]byte(`[Tt][Rr][Uu][Ee]`), booleanValue(true))
-	lexer.Add([]byte(`[Ff][Aa][Ll][Ss][Ee]`), booleanValue(false))
-
-	lexer.Add([]byte(`[Nn][Uu][Ll][Ll]`), nullValue())
-	lexer.Add([]byte(`~`), nullValue())
-
-	lexer.Add([]byte(`"([^"\\]*(\\.[^"\\]*)*)"`), stringValue(true))
-	lexer.Add([]byte(`strenv\([^\)]+\)`), envOp(true))
-	lexer.Add([]byte(`env\([^\)]+\)`), envOp(false))
-
-	lexer.Add([]byte(`\[`), literalToken(openCollect, false))
-	lexer.Add([]byte(`\]\??`), literalToken(closeCollect, true))
-	lexer.Add([]byte(`\{`), literalToken(openCollectObject, false))
-	lexer.Add([]byte(`\}`), literalToken(closeCollectObject, true))
-	lexer.Add([]byte(`\*[\+|\?d]*`), multiplyWithPrefs())
-	lexer.Add([]byte(`\+`), opToken(addOpType))
-	lexer.Add([]byte(`\+=`), opToken(addAssignOpType))
-	lexer.Add([]byte(`\-`), opToken(subtractOpType))
-	lexer.Add([]byte(`\-=`), opToken(subtractAssignOpType))
-	lexer.Add([]byte(`\$[a-zA-Z_-0-9]+`), getVariableOpToken())
-	lexer.Add([]byte(`as`), opToken(assignVariableOpType))
-
-	err := lexer.CompileNFA()
-	if err != nil {
-		return nil, err
-	}
-	return lexer, nil
-}
-
-type expressionTokeniser interface {
-	Tokenise(expression string) ([]*token, error)
-}
-
-type expressionTokeniserImpl struct {
-	lexer *lex.Lexer
-}
-
-func newExpressionTokeniser() expressionTokeniser {
-	var lexer, err = initLexer()
-	if err != nil {
-		panic(err)
-	}
-	return &expressionTokeniserImpl{lexer}
-}
-
-func (p *expressionTokeniserImpl) Tokenise(expression string) ([]*token, error) {
-	scanner, err := p.lexer.Scanner([]byte(expression))
-
-	if err != nil {
-		return nil, fmt.Errorf("Parsing expression: %v", err)
-	}
-	var tokens []*token
-	for tok, err, eof := scanner.Next(); !eof; tok, err, eof = scanner.Next() {
-
-		if tok != nil {
-			currentToken := tok.(*token)
-			log.Debugf("Tokenising %v", currentToken.toString(true))
-			tokens = append(tokens, currentToken)
-		}
-		if err != nil {
-			return nil, fmt.Errorf("Parsing expression: %v", err)
-		}
-	}
-	var postProcessedTokens = make([]*token, 0)
-
-	skipNextToken := false
-
-	for index := range tokens {
-		if skipNextToken {
-			skipNextToken = false
-		} else {
-			postProcessedTokens, skipNextToken = p.handleToken(tokens, index, postProcessedTokens)
-		}
-	}
-
-	return postProcessedTokens, nil
-}
-
-func (p *expressionTokeniserImpl) handleToken(tokens []*token, index int, postProcessedTokens []*token) (tokensAccum []*token, skipNextToken bool) {
-	skipNextToken = false
-	currentToken := tokens[index]
-
-	log.Debug("processing %v", currentToken.toString(true))
-
-	if currentToken.TokenType == traverseArrayCollect {
-		//need to put a traverse array then a collect currentToken
-		// do this by adding traverse then converting currentToken to collect
-
-		if index == 0 || tokens[index-1].TokenType != operationToken ||
-			tokens[index-1].Operation.OperationType != traversePathOpType {
-			log.Debug("  adding self")
-			op := &Operation{OperationType: selfReferenceOpType, StringValue: "SELF"}
-			postProcessedTokens = append(postProcessedTokens, &token{TokenType: operationToken, Operation: op})
-		}
-		log.Debug("  adding traverse array")
-		op := &Operation{OperationType: traverseArrayOpType, StringValue: "TRAVERSE_ARRAY"}
-		postProcessedTokens = append(postProcessedTokens, &token{TokenType: operationToken, Operation: op})
-
-		currentToken = &token{TokenType: openCollect}
-
-	}
-
-	if index != len(tokens)-1 && currentToken.AssignOperation != nil &&
-		tokens[index+1].TokenType == operationToken &&
-		tokens[index+1].Operation.OperationType == assignOpType {
-		log.Debug("  its an update assign")
-		currentToken.Operation = currentToken.AssignOperation
-		currentToken.Operation.UpdateAssign = tokens[index+1].Operation.UpdateAssign
-		skipNextToken = true
-	}
-
-	log.Debug("  adding token to the fixed list")
-	postProcessedTokens = append(postProcessedTokens, currentToken)
-
-	if index != len(tokens)-1 &&
-		((currentToken.TokenType == openCollect && tokens[index+1].TokenType == closeCollect) ||
-			(currentToken.TokenType == openCollectObject && tokens[index+1].TokenType == closeCollectObject)) {
-		log.Debug("  adding empty")
-		op := &Operation{OperationType: emptyOpType, StringValue: "EMPTY"}
-		postProcessedTokens = append(postProcessedTokens, &token{TokenType: operationToken, Operation: op})
-	}
-
-	if index != len(tokens)-1 && currentToken.CheckForPostTraverse &&
-		tokens[index+1].TokenType == operationToken &&
-		tokens[index+1].Operation.OperationType == traversePathOpType {
-		log.Debug("  adding pipe because the next thing is traverse")
-		op := &Operation{OperationType: shortPipeOpType, Value: "PIPE"}
-		postProcessedTokens = append(postProcessedTokens, &token{TokenType: operationToken, Operation: op})
-	}
-	if index != len(tokens)-1 && currentToken.CheckForPostTraverse &&
-		tokens[index+1].TokenType == openCollect {
-
-		// if tokens[index].TokenType == closeCollect {
-		// 	log.Debug("  adding pipe because next is opencollect")
-		// 	op := &Operation{OperationType: shortPipeOpType, Value: "PIPE"}
-		// 	postProcessedTokens = append(postProcessedTokens, &token{TokenType: operationToken, Operation: op})
-		// }
-		log.Debug("  adding traverArray because next is opencollect")
-		op := &Operation{OperationType: traverseArrayOpType}
-		postProcessedTokens = append(postProcessedTokens, &token{TokenType: operationToken, Operation: op})
-	}
-	return postProcessedTokens, skipNextToken
-}
--- a/pkg/yqlib/lib.go
+++ b/pkg/yqlib/lib.go
@ -1,5 +1,3 @@
-// Use the top level Evaluator or StreamEvaluator to evaluate expressions and return matches.
-//
 package yqlib

 import (
@ -13,108 +11,84 @@ import (

 var log = logging.MustGetLogger("yq-lib")

-type operationType struct {
+type OperationType struct {
 	Type       string
 	NumArgs    uint // number of arguments to the op
 	Precedence uint
-	Handler    operatorHandler
+	Handler    OperatorHandler
 }

-var orOpType = &operationType{Type: "OR", NumArgs: 2, Precedence: 20, Handler: orOperator}
-var andOpType = &operationType{Type: "AND", NumArgs: 2, Precedence: 20, Handler: andOperator}
-var reduceOpType = &operationType{Type: "REDUCE", NumArgs: 2, Precedence: 35, Handler: reduceOperator}
+// operators TODO:
+// - keys operator for controlling key metadata (particularly anchors/aliases)
+// - mergeEmpty (sets only if the document is empty, do I do that now?)

-var blockOpType = &operationType{Type: "BLOCK", Precedence: 10, NumArgs: 2, Handler: emptyOperator}
+var Or = &OperationType{Type: "OR", NumArgs: 2, Precedence: 20, Handler: OrOperator}
+var And = &OperationType{Type: "AND", NumArgs: 2, Precedence: 20, Handler: AndOperator}

-var unionOpType = &operationType{Type: "UNION", NumArgs: 2, Precedence: 10, Handler: unionOperator}
+var Union = &OperationType{Type: "UNION", NumArgs: 2, Precedence: 10, Handler: UnionOperator}

-var pipeOpType = &operationType{Type: "PIPE", NumArgs: 2, Precedence: 30, Handler: pipeOperator}
+var Pipe = &OperationType{Type: "PIPE", NumArgs: 2, Precedence: 30, Handler: PipeOperator}

-var assignOpType = &operationType{Type: "ASSIGN", NumArgs: 2, Precedence: 40, Handler: assignUpdateOperator}
-var addAssignOpType = &operationType{Type: "ADD_ASSIGN", NumArgs: 2, Precedence: 40, Handler: addAssignOperator}
-var subtractAssignOpType = &operationType{Type: "SUBTRACT_ASSIGN", NumArgs: 2, Precedence: 40, Handler: subtractAssignOperator}
+var Assign = &OperationType{Type: "ASSIGN", NumArgs: 2, Precedence: 40, Handler: AssignUpdateOperator}
+var AddAssign = &OperationType{Type: "ADD_ASSIGN", NumArgs: 2, Precedence: 40, Handler: AddAssignOperator}

-var assignAttributesOpType = &operationType{Type: "ASSIGN_ATTRIBUTES", NumArgs: 2, Precedence: 40, Handler: assignAttributesOperator}
-var assignStyleOpType = &operationType{Type: "ASSIGN_STYLE", NumArgs: 2, Precedence: 40, Handler: assignStyleOperator}
-var assignVariableOpType = &operationType{Type: "ASSIGN_VARIABLE", NumArgs: 2, Precedence: 40, Handler: assignVariableOperator}
-var assignTagOpType = &operationType{Type: "ASSIGN_TAG", NumArgs: 2, Precedence: 40, Handler: assignTagOperator}
-var assignCommentOpType = &operationType{Type: "ASSIGN_COMMENT", NumArgs: 2, Precedence: 40, Handler: assignCommentsOperator}
-var assignAnchorOpType = &operationType{Type: "ASSIGN_ANCHOR", NumArgs: 2, Precedence: 40, Handler: assignAnchorOperator}
-var assignAliasOpType = &operationType{Type: "ASSIGN_ALIAS", NumArgs: 2, Precedence: 40, Handler: assignAliasOperator}
+var AssignAttributes = &OperationType{Type: "ASSIGN_ATTRIBUTES", NumArgs: 2, Precedence: 40, Handler: AssignAttributesOperator}
+var AssignStyle = &OperationType{Type: "ASSIGN_STYLE", NumArgs: 2, Precedence: 40, Handler: AssignStyleOperator}
+var AssignTag = &OperationType{Type: "ASSIGN_TAG", NumArgs: 2, Precedence: 40, Handler: AssignTagOperator}
+var AssignComment = &OperationType{Type: "ASSIGN_COMMENT", NumArgs: 2, Precedence: 40, Handler: AssignCommentsOperator}
+var AssignAnchor = &OperationType{Type: "ASSIGN_ANCHOR", NumArgs: 2, Precedence: 40, Handler: AssignAnchorOperator}
+var AssignAlias = &OperationType{Type: "ASSIGN_ALIAS", NumArgs: 2, Precedence: 40, Handler: AssignAliasOperator}

-var multiplyOpType = &operationType{Type: "MULTIPLY", NumArgs: 2, Precedence: 42, Handler: multiplyOperator}
-var addOpType = &operationType{Type: "ADD", NumArgs: 2, Precedence: 42, Handler: addOperator}
-var subtractOpType = &operationType{Type: "SUBTRACT", NumArgs: 2, Precedence: 42, Handler: subtractOperator}
-var alternativeOpType = &operationType{Type: "ALTERNATIVE", NumArgs: 2, Precedence: 42, Handler: alternativeOperator}
+var Multiply = &OperationType{Type: "MULTIPLY", NumArgs: 2, Precedence: 45, Handler: MultiplyOperator}
+var Add = &OperationType{Type: "ADD", NumArgs: 2, Precedence: 45, Handler: AddOperator}
+var Alternative = &OperationType{Type: "ALTERNATIVE", NumArgs: 2, Precedence: 45, Handler: AlternativeOperator}

-var equalsOpType = &operationType{Type: "EQUALS", NumArgs: 2, Precedence: 40, Handler: equalsOperator}
-var notEqualsOpType = &operationType{Type: "EQUALS", NumArgs: 2, Precedence: 40, Handler: notEqualsOperator}
+var Equals = &OperationType{Type: "EQUALS", NumArgs: 2, Precedence: 40, Handler: EqualsOperator}
+var CreateMap = &OperationType{Type: "CREATE_MAP", NumArgs: 2, Precedence: 40, Handler: CreateMapOperator}

-//createmap needs to be above union, as we use union to build the components of the objects
-var createMapOpType = &operationType{Type: "CREATE_MAP", NumArgs: 2, Precedence: 15, Handler: createMapOperator}
+var ShortPipe = &OperationType{Type: "SHORT_PIPE", NumArgs: 2, Precedence: 45, Handler: PipeOperator}

-var shortPipeOpType = &operationType{Type: "SHORT_PIPE", NumArgs: 2, Precedence: 45, Handler: pipeOperator}
+var Length = &OperationType{Type: "LENGTH", NumArgs: 0, Precedence: 50, Handler: LengthOperator}
+var Collect = &OperationType{Type: "COLLECT", NumArgs: 0, Precedence: 50, Handler: CollectOperator}
+var GetStyle = &OperationType{Type: "GET_STYLE", NumArgs: 0, Precedence: 50, Handler: GetStyleOperator}
+var GetTag = &OperationType{Type: "GET_TAG", NumArgs: 0, Precedence: 50, Handler: GetTagOperator}
+var GetComment = &OperationType{Type: "GET_COMMENT", NumArgs: 0, Precedence: 50, Handler: GetCommentsOperator}
+var GetAnchor = &OperationType{Type: "GET_ANCHOR", NumArgs: 0, Precedence: 50, Handler: GetAnchorOperator}
+var GetAlias = &OperationType{Type: "GET_ALIAS", NumArgs: 0, Precedence: 50, Handler: GetAliasOperator}
+var GetDocumentIndex = &OperationType{Type: "GET_DOCUMENT_INDEX", NumArgs: 0, Precedence: 50, Handler: GetDocumentIndexOperator}
+var GetFilename = &OperationType{Type: "GET_FILENAME", NumArgs: 0, Precedence: 50, Handler: GetFilenameOperator}
+var GetFileIndex = &OperationType{Type: "GET_FILE_INDEX", NumArgs: 0, Precedence: 50, Handler: GetFileIndexOperator}
+var GetPath = &OperationType{Type: "GET_PATH", NumArgs: 0, Precedence: 50, Handler: GetPathOperator}

-var lengthOpType = &operationType{Type: "LENGTH", NumArgs: 0, Precedence: 50, Handler: lengthOperator}
-var collectOpType = &operationType{Type: "COLLECT", NumArgs: 0, Precedence: 50, Handler: collectOperator}
+var Explode = &OperationType{Type: "EXPLODE", NumArgs: 1, Precedence: 50, Handler: ExplodeOperator}
+var SortKeys = &OperationType{Type: "SORT_KEYS", NumArgs: 1, Precedence: 50, Handler: SortKeysOperator}

-var anyOpType = &operationType{Type: "ANY", NumArgs: 0, Precedence: 50, Handler: anyOperator}
-var allOpType = &operationType{Type: "ALL", NumArgs: 0, Precedence: 50, Handler: allOperator}
-var anyConditionOpType = &operationType{Type: "ANY_CONDITION", NumArgs: 1, Precedence: 50, Handler: anyOperator}
-var allConditionOpType = &operationType{Type: "ALL_CONDITION", NumArgs: 1, Precedence: 50, Handler: allOperator}
+var CollectObject = &OperationType{Type: "COLLECT_OBJECT", NumArgs: 0, Precedence: 50, Handler: CollectObjectOperator}
+var TraversePath = &OperationType{Type: "TRAVERSE_PATH", NumArgs: 0, Precedence: 50, Handler: TraversePathOperator}
+var TraverseArray = &OperationType{Type: "TRAVERSE_ARRAY", NumArgs: 1, Precedence: 50, Handler: TraverseArrayOperator}

-var toEntriesOpType = &operationType{Type: "TO_ENTRIES", NumArgs: 0, Precedence: 50, Handler: toEntriesOperator}
-var fromEntriesOpType = &operationType{Type: "FROM_ENTRIES", NumArgs: 0, Precedence: 50, Handler: fromEntriesOperator}
-var withEntriesOpType = &operationType{Type: "WITH_ENTRIES", NumArgs: 1, Precedence: 50, Handler: withEntriesOperator}
+var DocumentFilter = &OperationType{Type: "DOCUMENT_FILTER", NumArgs: 0, Precedence: 50, Handler: TraversePathOperator}
+var SelfReference = &OperationType{Type: "SELF", NumArgs: 0, Precedence: 50, Handler: SelfOperator}
+var ValueOp = &OperationType{Type: "VALUE", NumArgs: 0, Precedence: 50, Handler: ValueOperator}
+var Not = &OperationType{Type: "NOT", NumArgs: 0, Precedence: 50, Handler: NotOperator}
+var Empty = &OperationType{Type: "EMPTY", NumArgs: 50, Handler: EmptyOperator}

-var splitDocumentOpType = &operationType{Type: "SPLIT_DOC", NumArgs: 0, Precedence: 50, Handler: splitDocumentOperator}
-var getVariableOpType = &operationType{Type: "GET_VARIABLE", NumArgs: 0, Precedence: 55, Handler: getVariableOperator}
-var getStyleOpType = &operationType{Type: "GET_STYLE", NumArgs: 0, Precedence: 50, Handler: getStyleOperator}
-var getTagOpType = &operationType{Type: "GET_TAG", NumArgs: 0, Precedence: 50, Handler: getTagOperator}
-var getCommentOpType = &operationType{Type: "GET_COMMENT", NumArgs: 0, Precedence: 50, Handler: getCommentsOperator}
-var getAnchorOpType = &operationType{Type: "GET_ANCHOR", NumArgs: 0, Precedence: 50, Handler: getAnchorOperator}
-var getAliasOptype = &operationType{Type: "GET_ALIAS", NumArgs: 0, Precedence: 50, Handler: getAliasOperator}
-var getDocumentIndexOpType = &operationType{Type: "GET_DOCUMENT_INDEX", NumArgs: 0, Precedence: 50, Handler: getDocumentIndexOperator}
-var getFilenameOpType = &operationType{Type: "GET_FILENAME", NumArgs: 0, Precedence: 50, Handler: getFilenameOperator}
-var getFileIndexOpType = &operationType{Type: "GET_FILE_INDEX", NumArgs: 0, Precedence: 50, Handler: getFileIndexOperator}
-var getPathOpType = &operationType{Type: "GET_PATH", NumArgs: 0, Precedence: 50, Handler: getPathOperator}
+var RecursiveDescent = &OperationType{Type: "RECURSIVE_DESCENT", NumArgs: 0, Precedence: 50, Handler: RecursiveDescentOperator}

-var explodeOpType = &operationType{Type: "EXPLODE", NumArgs: 1, Precedence: 50, Handler: explodeOperator}
-var sortKeysOpType = &operationType{Type: "SORT_KEYS", NumArgs: 1, Precedence: 50, Handler: sortKeysOperator}
-var joinStringOpType = &operationType{Type: "JOIN", NumArgs: 1, Precedence: 50, Handler: joinStringOperator}
-var subStringOpType = &operationType{Type: "SUBSTR", NumArgs: 1, Precedence: 50, Handler: substituteStringOperator}
-var splitStringOpType = &operationType{Type: "SPLIT", NumArgs: 1, Precedence: 50, Handler: splitStringOperator}
-
-var keysOpType = &operationType{Type: "KEYS", NumArgs: 0, Precedence: 50, Handler: keysOperator}
-
-var collectObjectOpType = &operationType{Type: "COLLECT_OBJECT", NumArgs: 0, Precedence: 50, Handler: collectObjectOperator}
-var traversePathOpType = &operationType{Type: "TRAVERSE_PATH", NumArgs: 0, Precedence: 55, Handler: traversePathOperator}
-var traverseArrayOpType = &operationType{Type: "TRAVERSE_ARRAY", NumArgs: 2, Precedence: 50, Handler: traverseArrayOperator}
-
-var selfReferenceOpType = &operationType{Type: "SELF", NumArgs: 0, Precedence: 55, Handler: selfOperator}
-var valueOpType = &operationType{Type: "VALUE", NumArgs: 0, Precedence: 50, Handler: valueOperator}
-var envOpType = &operationType{Type: "ENV", NumArgs: 0, Precedence: 50, Handler: envOperator}
-var notOpType = &operationType{Type: "NOT", NumArgs: 0, Precedence: 50, Handler: notOperator}
-var emptyOpType = &operationType{Type: "EMPTY", Precedence: 50, Handler: emptyOperator}
-
-var recursiveDescentOpType = &operationType{Type: "RECURSIVE_DESCENT", NumArgs: 0, Precedence: 50, Handler: recursiveDescentOperator}
-
-var selectOpType = &operationType{Type: "SELECT", NumArgs: 1, Precedence: 50, Handler: selectOperator}
-var hasOpType = &operationType{Type: "HAS", NumArgs: 1, Precedence: 50, Handler: hasOperator}
-var uniqueOpType = &operationType{Type: "UNIQUE", NumArgs: 0, Precedence: 50, Handler: unique}
-var uniqueByOpType = &operationType{Type: "UNIQUE_BY", NumArgs: 1, Precedence: 50, Handler: uniqueBy}
-var deleteChildOpType = &operationType{Type: "DELETE", NumArgs: 1, Precedence: 40, Handler: deleteChildOperator}
+var Select = &OperationType{Type: "SELECT", NumArgs: 1, Precedence: 50, Handler: SelectOperator}
+var Has = &OperationType{Type: "HAS", NumArgs: 1, Precedence: 50, Handler: HasOperator}
+var DeleteChild = &OperationType{Type: "DELETE", NumArgs: 1, Precedence: 40, Handler: DeleteChildOperator}
+var DeleteImmediateChild = &OperationType{Type: "DELETE_IMMEDIATE_CHILD", NumArgs: 1, Precedence: 40, Handler: DeleteImmediateChildOperator}

 type Operation struct {
-	OperationType *operationType
+	OperationType *OperationType
 	Value         interface{}
 	StringValue   string
 	CandidateNode *CandidateNode // used for Value Path elements
 	Preferences   interface{}
-	UpdateAssign  bool // used for assign ops, when true it means we evaluate the rhs given the lhs
 }

-func createValueOperation(value interface{}, stringValue string) *Operation {
+func CreateValueOperation(value interface{}, stringValue string) *Operation {
 	var node yaml.Node = yaml.Node{Kind: yaml.ScalarNode}
 	node.Value = stringValue

@ -132,7 +106,7 @@ func createValueOperation(value interface{}, stringValue string) *Operation {
 	}

 	return &Operation{
-		OperationType: valueOpType,
+		OperationType: ValueOp,
 		Value:         value,
 		StringValue:   stringValue,
 		CandidateNode: &CandidateNode{Node: &node},
@ -141,11 +115,13 @@ func createValueOperation(value interface{}, stringValue string) *Operation {

 // debugging purposes only
 func (p *Operation) toString() string {
-	if p.OperationType == traversePathOpType {
+	if p.OperationType == TraversePath {
 		return fmt.Sprintf("%v", p.Value)
-	} else if p.OperationType == selfReferenceOpType {
+	} else if p.OperationType == DocumentFilter {
+		return fmt.Sprintf("d%v", p.Value)
+	} else if p.OperationType == SelfReference {
 		return "SELF"
-	} else if p.OperationType == valueOpType {
+	} else if p.OperationType == ValueOp {
 		return fmt.Sprintf("%v (%T)", p.Value, p.Value)
 	} else {
 		return fmt.Sprintf("%v", p.OperationType.Type)
--- a/pkg/yqlib/matchKeyString.go
+++ b/pkg/yqlib/matchKeyString.go
@ -1,6 +1,6 @@
 package yqlib

-func matchKey(name string, pattern string) (matched bool) {
+func Match(name string, pattern string) (matched bool) {
 	if pattern == "" {
 		return name == pattern
 	}
--- a/pkg/yqlib/operator_add.go
+++ b/pkg/yqlib/operator_add.go
@ -3,23 +3,23 @@ package yqlib
 import (
 	"fmt"

-	"strconv"
+	"container/list"

 	yaml "gopkg.in/yaml.v3"
 )

-func createAddOp(lhs *ExpressionNode, rhs *ExpressionNode) *ExpressionNode {
-	return &ExpressionNode{Operation: &Operation{OperationType: addOpType},
-		Lhs: lhs,
+func createSelfAddOp(rhs *PathTreeNode) *PathTreeNode {
+	return &PathTreeNode{Operation: &Operation{OperationType: Add},
+		Lhs: &PathTreeNode{Operation: &Operation{OperationType: SelfReference}},
 		Rhs: rhs}
 }

-func addAssignOperator(d *dataTreeNavigator, context Context, expressionNode *ExpressionNode) (Context, error) {
-	assignmentOp := &Operation{OperationType: assignOpType}
-	assignmentOp.UpdateAssign = true
-	selfExpression := &ExpressionNode{Operation: &Operation{OperationType: selfReferenceOpType}}
-	assignmentOpNode := &ExpressionNode{Operation: assignmentOp, Lhs: expressionNode.Lhs, Rhs: createAddOp(selfExpression, expressionNode.Rhs)}
-	return d.GetMatchingNodes(context, assignmentOpNode)
+func AddAssignOperator(d *dataTreeNavigator, matchingNodes *list.List, pathNode *PathTreeNode) (*list.List, error) {
+	assignmentOp := &Operation{OperationType: Assign}
+	assignmentOp.Preferences = &AssignOpPreferences{true}
+
+	assignmentOpNode := &PathTreeNode{Operation: assignmentOp, Lhs: pathNode.Lhs, Rhs: createSelfAddOp(pathNode.Rhs)}
+	return d.GetMatchingNodes(matchingNodes, assignmentOpNode)
 }

 func toNodes(candidate *CandidateNode) []*yaml.Node {
@ -36,23 +36,23 @@ func toNodes(candidate *CandidateNode) []*yaml.Node {

 }

-func addOperator(d *dataTreeNavigator, context Context, expressionNode *ExpressionNode) (Context, error) {
+func AddOperator(d *dataTreeNavigator, matchingNodes *list.List, pathNode *PathTreeNode) (*list.List, error) {
 	log.Debugf("Add operator")

-	return crossFunction(d, context.ReadOnlyClone(), expressionNode, add, false)
+	return crossFunction(d, matchingNodes, pathNode, add)
 }

-func add(d *dataTreeNavigator, context Context, lhs *CandidateNode, rhs *CandidateNode) (*CandidateNode, error) {
-	lhs.Node = unwrapDoc(lhs.Node)
-	rhs.Node = unwrapDoc(rhs.Node)
+func add(d *dataTreeNavigator, lhs *CandidateNode, rhs *CandidateNode) (*CandidateNode, error) {
+	lhs.Node = UnwrapDoc(lhs.Node)
+	rhs.Node = UnwrapDoc(rhs.Node)

-	lhsNode := lhs.Node
-
-	if lhsNode.Tag == "!!null" {
-		return lhs.CreateChild(nil, rhs.Node), nil
+	target := &CandidateNode{
+		Path:     lhs.Path,
+		Document: lhs.Document,
+		Filename: lhs.Filename,
+		Node:     &yaml.Node{},
 	}
-
-	target := lhs.CreateChild(nil, &yaml.Node{})
+	lhsNode := lhs.Node

 	switch lhsNode.Kind {
 	case yaml.MappingNode:
@ -63,48 +63,7 @@ func add(d *dataTreeNavigator, context Context, lhs *CandidateNode, rhs *Candida
 		target.Node.Tag = "!!seq"
 		target.Node.Content = append(lhsNode.Content, toNodes(rhs)...)
 	case yaml.ScalarNode:
-		if rhs.Node.Kind != yaml.ScalarNode {
-			return nil, fmt.Errorf("%v (%v) cannot be added to a %v", rhs.Node.Tag, rhs.Path, lhsNode.Tag)
-		}
-		target.Node.Kind = yaml.ScalarNode
-		target.Node.Style = lhsNode.Style
-		return addScalars(target, lhsNode, rhs.Node)
-	}
-
-	return target, nil
-}
-
-func addScalars(target *CandidateNode, lhs *yaml.Node, rhs *yaml.Node) (*CandidateNode, error) {
-
-	if lhs.Tag == "!!str" {
-		target.Node.Tag = "!!str"
-		target.Node.Value = lhs.Value + rhs.Value
-	} else if lhs.Tag == "!!int" && rhs.Tag == "!!int" {
-		lhsNum, err := strconv.Atoi(lhs.Value)
-		if err != nil {
-			return nil, err
-		}
-		rhsNum, err := strconv.Atoi(rhs.Value)
-		if err != nil {
-			return nil, err
-		}
-		sum := lhsNum + rhsNum
-		target.Node.Tag = "!!int"
-		target.Node.Value = fmt.Sprintf("%v", sum)
-	} else if (lhs.Tag == "!!int" || lhs.Tag == "!!float") && (rhs.Tag == "!!int" || rhs.Tag == "!!float") {
-		lhsNum, err := strconv.ParseFloat(lhs.Value, 64)
-		if err != nil {
-			return nil, err
-		}
-		rhsNum, err := strconv.ParseFloat(rhs.Value, 64)
-		if err != nil {
-			return nil, err
-		}
-		sum := lhsNum + rhsNum
-		target.Node.Tag = "!!float"
-		target.Node.Value = fmt.Sprintf("%v", sum)
-	} else {
-		return nil, fmt.Errorf("%v cannot be added to %v", lhs.Tag, rhs.Tag)
+		return nil, fmt.Errorf("Scalars not yet supported for addition")
 	}

 	return target, nil
--- a/pkg/yqlib/operator_add_test.go
+++ b/pkg/yqlib/operator_add_test.go
@ -5,31 +5,6 @@ import (
 )

 var addOperatorScenarios = []expressionScenario{
-	{
-		skipDoc:    true,
-		document:   `[{a: foo, b: bar}, {a: 1, b: 2}]`,
-		expression: ".[] | .a + .b",
-		expected: []string{
-			"D0, P[0 a], (!!str)::foobar\n",
-			"D0, P[1 a], (!!int)::3\n",
-		},
-	},
-	{
-		skipDoc:    true,
-		document:   `{}`,
-		expression: "(.a + .b) as $x",
-		expected: []string{
-			"D0, P[], (doc)::{}\n",
-		},
-	},
-	{
-		skipDoc:    true,
-		document:   `a: 0`,
-		expression: ".a += .b.c",
-		expected: []string{
-			"D0, P[], (doc)::a: 0\n",
-		},
-	},
 	{
 		description: "Concatenate and assign arrays",
 		document:    `{a: {val: thing, b: [cat,dog]}}`,
@ -63,11 +38,11 @@ var addOperatorScenarios = []expressionScenario{
 		},
 	},
 	{
-		description: "Add new object to array",
-		document:    `a: [{dog: woof}]`,
-		expression:  `.a + {"cat": "meow"}`,
+		description: "Add object to array",
+		document:    `{a: [1,2], c: {cat: meow}}`,
+		expression:  `.a + .c`,
 		expected: []string{
-			"D0, P[a], (!!seq)::[{dog: woof}, {cat: meow}]\n",
+			"D0, P[a], (!!seq)::[1, 2, {cat: meow}]\n",
 		},
 	},
 	{
@ -79,63 +54,13 @@ var addOperatorScenarios = []expressionScenario{
 		},
 	},
 	{
-		description: "Append to array",
+		description: "Update array (append)",
 		document:    `{a: [1,2], b: [3,4]}`,
 		expression:  `.a = .a + .b`,
 		expected: []string{
 			"D0, P[], (doc)::{a: [1, 2, 3, 4], b: [3, 4]}\n",
 		},
 	},
-	{
-		description: "Relative append",
-		document:    `a: { a1: {b: [cat]}, a2: {b: [dog]}, a3: {} }`,
-		expression:  `.a[].b += ["mouse"]`,
-		expected: []string{
-			"D0, P[], (doc)::a: {a1: {b: [cat, mouse]}, a2: {b: [dog, mouse]}, a3: {b: [mouse]}}\n",
-		},
-	},
-	{
-		description: "String concatenation",
-		document:    `{a: cat, b: meow}`,
-		expression:  `.a = .a + .b`,
-		expected: []string{
-			"D0, P[], (doc)::{a: catmeow, b: meow}\n",
-		},
-	},
-	{
-		description:    "Number addition - float",
-		subdescription: "If the lhs or rhs are floats then the expression will be calculated with floats.",
-		document:       `{a: 3, b: 4.9}`,
-		expression:     `.a = .a + .b`,
-		expected: []string{
-			"D0, P[], (doc)::{a: 7.9, b: 4.9}\n",
-		},
-	},
-	{
-		description:    "Number addition - int",
-		subdescription: "If both the lhs and rhs are ints then the expression will be calculated with ints.",
-		document:       `{a: 3, b: 4}`,
-		expression:     `.a = .a + .b`,
-		expected: []string{
-			"D0, P[], (doc)::{a: 7, b: 4}\n",
-		},
-	},
-	{
-		description: "Increment numbers",
-		document:    `{a: 3, b: 5}`,
-		expression:  `.[] += 1`,
-		expected: []string{
-			"D0, P[], (doc)::{a: 4, b: 6}\n",
-		},
-	},
-	{
-		description:    "Add to null",
-		subdescription: "Adding to null simply returns the rhs",
-		expression:     `null + "cat"`,
-		expected: []string{
-			"D0, P[], (!!str)::cat\n",
-		},
-	},
 }

 func TestAddOperatorScenarios(t *testing.T) {
--- a/pkg/yqlib/operator_alternative.go
+++ b/pkg/yqlib/operator_alternative.go
@ -1,16 +1,20 @@
 package yqlib

-func alternativeOperator(d *dataTreeNavigator, context Context, expressionNode *ExpressionNode) (Context, error) {
+import (
+	"container/list"
+)
+
+// corssFunction no matches
+// can boolean use crossfunction
+
+func AlternativeOperator(d *dataTreeNavigator, matchingNodes *list.List, pathNode *PathTreeNode) (*list.List, error) {
 	log.Debugf("-- alternative")
-	return crossFunction(d, context.ReadOnlyClone(), expressionNode, alternativeFunc, true)
+	return crossFunction(d, matchingNodes, pathNode, alternativeFunc)
 }

-func alternativeFunc(d *dataTreeNavigator, context Context, lhs *CandidateNode, rhs *CandidateNode) (*CandidateNode, error) {
-	if lhs == nil {
-		return rhs, nil
-	}
-	lhs.Node = unwrapDoc(lhs.Node)
-	rhs.Node = unwrapDoc(rhs.Node)
+func alternativeFunc(d *dataTreeNavigator, lhs *CandidateNode, rhs *CandidateNode) (*CandidateNode, error) {
+	lhs.Node = UnwrapDoc(lhs.Node)
+	rhs.Node = UnwrapDoc(rhs.Node)
 	log.Debugf("Alternative LHS: %v", lhs.Node.Tag)
 	log.Debugf("-          RHS: %v", rhs.Node.Tag)

--- a/pkg/yqlib/operator_alternative_test.go
+++ b/pkg/yqlib/operator_alternative_test.go
@ -5,20 +5,6 @@ import (
 )

 var alternativeOperatorScenarios = []expressionScenario{
-	{
-		skipDoc:    true,
-		expression: `.b // .c`,
-		document:   `a: bridge`,
-		expected:   []string{},
-	},
-	{
-		skipDoc:    true,
-		expression: `(.b // "hello") as $x`,
-		document:   `a: bridge`,
-		expected: []string{
-			"D0, P[], (doc)::a: bridge\n",
-		},
-	},
 	{
 		description: "LHS is defined",
 		expression:  `.a // "hello"`,
@ -27,14 +13,6 @@ var alternativeOperatorScenarios = []expressionScenario{
 			"D0, P[a], (!!str)::bridge\n",
 		},
 	},
-	{
-		expression: `select(tag == "seq") // "cat"`,
-		skipDoc:    true,
-		document:   `a: frog`,
-		expected: []string{
-			"D0, P[], (!!str)::cat\n",
-		},
-	},
 	{
 		description: "LHS is not defined",
 		expression:  `.a // "hello"`,
--- a/pkg/yqlib/operator_anchors_aliases.go
+++ b/pkg/yqlib/operator_anchors_aliases.go
@ -3,151 +3,121 @@ package yqlib
 import (
 	"container/list"

-	yaml "gopkg.in/yaml.v3"
+	"gopkg.in/yaml.v3"
 )

-func assignAliasOperator(d *dataTreeNavigator, context Context, expressionNode *ExpressionNode) (Context, error) {
+func AssignAliasOperator(d *dataTreeNavigator, matchingNodes *list.List, pathNode *PathTreeNode) (*list.List, error) {

 	log.Debugf("AssignAlias operator!")

+	rhs, err := d.GetMatchingNodes(matchingNodes, pathNode.Rhs)
+	if err != nil {
+		return nil, err
+	}
 	aliasName := ""
-	if !expressionNode.Operation.UpdateAssign {
-		rhs, err := d.GetMatchingNodes(context.ReadOnlyClone(), expressionNode.Rhs)
-		if err != nil {
-			return Context{}, err
-		}
-		if rhs.MatchingNodes.Front() != nil {
-			aliasName = rhs.MatchingNodes.Front().Value.(*CandidateNode).Node.Value
-		}
+	if rhs.Front() != nil {
+		aliasName = rhs.Front().Value.(*CandidateNode).Node.Value
 	}

-	lhs, err := d.GetMatchingNodes(context, expressionNode.Lhs)
+	lhs, err := d.GetMatchingNodes(matchingNodes, pathNode.Lhs)

 	if err != nil {
-		return Context{}, err
+		return nil, err
 	}

-	for el := lhs.MatchingNodes.Front(); el != nil; el = el.Next() {
+	for el := lhs.Front(); el != nil; el = el.Next() {
 		candidate := el.Value.(*CandidateNode)
 		log.Debugf("Setting aliasName : %v", candidate.GetKey())
-
-		if expressionNode.Operation.UpdateAssign {
-			rhs, err := d.GetMatchingNodes(context.SingleReadonlyChildContext(candidate), expressionNode.Rhs)
-			if err != nil {
-				return Context{}, err
-			}
-			if rhs.MatchingNodes.Front() != nil {
-				aliasName = rhs.MatchingNodes.Front().Value.(*CandidateNode).Node.Value
-			}
-		}
-
-		if aliasName != "" {
-			candidate.Node.Kind = yaml.AliasNode
-			candidate.Node.Value = aliasName
-		}
+		candidate.Node.Kind = yaml.AliasNode
+		candidate.Node.Value = aliasName
 	}
-	return context, nil
+	return matchingNodes, nil
 }

-func getAliasOperator(d *dataTreeNavigator, context Context, expressionNode *ExpressionNode) (Context, error) {
+func GetAliasOperator(d *dataTreeNavigator, matchingNodes *list.List, pathNode *PathTreeNode) (*list.List, error) {
 	log.Debugf("GetAlias operator!")
 	var results = list.New()

-	for el := context.MatchingNodes.Front(); el != nil; el = el.Next() {
+	for el := matchingNodes.Front(); el != nil; el = el.Next() {
 		candidate := el.Value.(*CandidateNode)
 		node := &yaml.Node{Kind: yaml.ScalarNode, Value: candidate.Node.Value, Tag: "!!str"}
-		result := candidate.CreateChild(nil, node)
-		results.PushBack(result)
+		lengthCand := &CandidateNode{Node: node, Document: candidate.Document, Path: candidate.Path}
+		results.PushBack(lengthCand)
 	}
-	return context.ChildContext(results), nil
+	return results, nil
 }

-func assignAnchorOperator(d *dataTreeNavigator, context Context, expressionNode *ExpressionNode) (Context, error) {
+func AssignAnchorOperator(d *dataTreeNavigator, matchingNodes *list.List, pathNode *PathTreeNode) (*list.List, error) {

 	log.Debugf("AssignAnchor operator!")

+	rhs, err := d.GetMatchingNodes(matchingNodes, pathNode.Rhs)
+	if err != nil {
+		return nil, err
+	}
 	anchorName := ""
-	if !expressionNode.Operation.UpdateAssign {
-		rhs, err := d.GetMatchingNodes(context.ReadOnlyClone(), expressionNode.Rhs)
-		if err != nil {
-			return Context{}, err
-		}
-
-		if rhs.MatchingNodes.Front() != nil {
-			anchorName = rhs.MatchingNodes.Front().Value.(*CandidateNode).Node.Value
-		}
+	if rhs.Front() != nil {
+		anchorName = rhs.Front().Value.(*CandidateNode).Node.Value
 	}

-	lhs, err := d.GetMatchingNodes(context, expressionNode.Lhs)
+	lhs, err := d.GetMatchingNodes(matchingNodes, pathNode.Lhs)

 	if err != nil {
-		return Context{}, err
+		return nil, err
 	}

-	for el := lhs.MatchingNodes.Front(); el != nil; el = el.Next() {
+	for el := lhs.Front(); el != nil; el = el.Next() {
 		candidate := el.Value.(*CandidateNode)
 		log.Debugf("Setting anchorName of : %v", candidate.GetKey())
-
-		if expressionNode.Operation.UpdateAssign {
-			rhs, err := d.GetMatchingNodes(context.SingleReadonlyChildContext(candidate), expressionNode.Rhs)
-			if err != nil {
-				return Context{}, err
-			}
-
-			if rhs.MatchingNodes.Front() != nil {
-				anchorName = rhs.MatchingNodes.Front().Value.(*CandidateNode).Node.Value
-			}
-		}
-
 		candidate.Node.Anchor = anchorName
 	}
-	return context, nil
+	return matchingNodes, nil
 }

-func getAnchorOperator(d *dataTreeNavigator, context Context, expressionNode *ExpressionNode) (Context, error) {
+func GetAnchorOperator(d *dataTreeNavigator, matchingNodes *list.List, pathNode *PathTreeNode) (*list.List, error) {
 	log.Debugf("GetAnchor operator!")
 	var results = list.New()

-	for el := context.MatchingNodes.Front(); el != nil; el = el.Next() {
+	for el := matchingNodes.Front(); el != nil; el = el.Next() {
 		candidate := el.Value.(*CandidateNode)
 		anchor := candidate.Node.Anchor
 		node := &yaml.Node{Kind: yaml.ScalarNode, Value: anchor, Tag: "!!str"}
-		result := candidate.CreateChild(nil, node)
-		results.PushBack(result)
+		lengthCand := &CandidateNode{Node: node, Document: candidate.Document, Path: candidate.Path}
+		results.PushBack(lengthCand)
 	}
-	return context.ChildContext(results), nil
+	return results, nil
 }

-func explodeOperator(d *dataTreeNavigator, context Context, expressionNode *ExpressionNode) (Context, error) {
+func ExplodeOperator(d *dataTreeNavigator, matchMap *list.List, pathNode *PathTreeNode) (*list.List, error) {
 	log.Debugf("-- ExplodeOperation")

-	for el := context.MatchingNodes.Front(); el != nil; el = el.Next() {
+	for el := matchMap.Front(); el != nil; el = el.Next() {
 		candidate := el.Value.(*CandidateNode)

-		rhs, err := d.GetMatchingNodes(context.SingleChildContext(candidate), expressionNode.Rhs)
+		rhs, err := d.GetMatchingNodes(nodeToMap(candidate), pathNode.Rhs)

 		if err != nil {
-			return Context{}, err
+			return nil, err
 		}
-		for childEl := rhs.MatchingNodes.Front(); childEl != nil; childEl = childEl.Next() {
-			err = explodeNode(childEl.Value.(*CandidateNode).Node, context)
+		for childEl := rhs.Front(); childEl != nil; childEl = childEl.Next() {
+			err = explodeNode(childEl.Value.(*CandidateNode).Node)
 			if err != nil {
-				return Context{}, err
+				return nil, err
 			}
 		}

 	}

-	return context, nil
+	return matchMap, nil
 }

-func explodeNode(node *yaml.Node, context Context) error {
+func explodeNode(node *yaml.Node) error {
 	node.Anchor = ""
 	switch node.Kind {
 	case yaml.SequenceNode, yaml.DocumentNode:
 		for index, contentNode := range node.Content {
 			log.Debugf("exploding index %v", index)
-			errorInContent := explodeNode(contentNode, context)
+			errorInContent := explodeNode(contentNode)
 			if errorInContent != nil {
 				return errorInContent
 			}
@ -171,23 +141,23 @@ func explodeNode(node *yaml.Node, context Context) error {
 			valueNode := node.Content[index+1]
 			log.Debugf("traversing %v", keyNode.Value)
 			if keyNode.Value != "<<" {
-				err := overrideEntry(node, keyNode, valueNode, index, context.ChildContext(newContent))
+				err := overrideEntry(node, keyNode, valueNode, index, newContent)
 				if err != nil {
 					return err
 				}
 			} else {
 				if valueNode.Kind == yaml.SequenceNode {
 					log.Debugf("an alias merge list!")
-					for index := len(valueNode.Content) - 1; index >= 0; index = index - 1 {
+					for index := 0; index < len(valueNode.Content); index = index + 1 {
 						aliasNode := valueNode.Content[index]
-						err := applyAlias(node, aliasNode.Alias, index, context.ChildContext(newContent))
+						err := applyAlias(node, aliasNode.Alias, index, newContent)
 						if err != nil {
 							return err
 						}
 					}
 				} else {
 					log.Debugf("an alias merge!")
-					err := applyAlias(node, valueNode.Alias, index, context.ChildContext(newContent))
+					err := applyAlias(node, valueNode.Alias, index, newContent)
 					if err != nil {
 						return err
 					}
@ -207,7 +177,7 @@ func explodeNode(node *yaml.Node, context Context) error {
 	}
 }

-func applyAlias(node *yaml.Node, alias *yaml.Node, aliasIndex int, newContent Context) error {
+func applyAlias(node *yaml.Node, alias *yaml.Node, aliasIndex int, newContent *list.List) error {
 	if alias == nil {
 		return nil
 	}
@ -223,15 +193,15 @@ func applyAlias(node *yaml.Node, alias *yaml.Node, aliasIndex int, newContent Co
 	return nil
 }

-func overrideEntry(node *yaml.Node, key *yaml.Node, value *yaml.Node, startIndex int, newContent Context) error {
+func overrideEntry(node *yaml.Node, key *yaml.Node, value *yaml.Node, startIndex int, newContent *list.List) error {

-	err := explodeNode(value, newContent)
+	err := explodeNode(value)

 	if err != nil {
 		return err
 	}

-	for newEl := newContent.MatchingNodes.Front(); newEl != nil; newEl = newEl.Next() {
+	for newEl := newContent.Front(); newEl != nil; newEl = newEl.Next() {
 		valueEl := newEl.Next() // move forward twice
 		keyNode := newEl.Value.(*yaml.Node)
 		log.Debugf("checking new content %v:%v", keyNode.Value, valueEl.Value.(*yaml.Node).Value)
@ -252,12 +222,12 @@ func overrideEntry(node *yaml.Node, key *yaml.Node, value *yaml.Node, startIndex
 		}
 	}

-	err = explodeNode(key, newContent)
+	err = explodeNode(key)
 	if err != nil {
 		return err
 	}
 	log.Debugf("adding %v:%v", key.Value, value.Value)
-	newContent.MatchingNodes.PushBack(key)
-	newContent.MatchingNodes.PushBack(value)
+	newContent.PushBack(key)
+	newContent.PushBack(value)
 	return nil
 }
--- a/pkg/yqlib/operator_anchors_aliases_test.go
+++ b/pkg/yqlib/operator_anchors_aliases_test.go
@ -4,36 +4,7 @@ import (
 	"testing"
 )

-var specDocument = `- &CENTER { x: 1, y: 2 }
- &LEFT { x: 0, y: 2 }
- &BIG { r: 10 }
- &SMALL { r: 1 }
-`
-
-var expectedSpecResult = "D0, P[4], (!!map)::x: 1\ny: 2\nr: 10\n"
-
 var anchorOperatorScenarios = []expressionScenario{
-	{
-		description:    "Merge one map",
-		subdescription: "see https://yaml.org/type/merge.html",
-		document:       specDocument + "- << : *CENTER\n  r: 10\n",
-		expression:     ".[4] | explode(.)",
-		expected:       []string{expectedSpecResult},
-	},
-	{
-		description:    "Merge multiple maps",
-		subdescription: "see https://yaml.org/type/merge.html",
-		document:       specDocument + "- << : [ *CENTER, *BIG ]\n",
-		expression:     ".[4] | explode(.)",
-		expected:       []string{"D0, P[4], (!!map)::r: 10\nx: 1\ny: 2\n"},
-	},
-	{
-		description:    "Override",
-		subdescription: "see https://yaml.org/type/merge.html",
-		document:       specDocument + "- << : [ *BIG, *LEFT, *SMALL ]\n  x: 1\n",
-		expression:     ".[4] | explode(.)",
-		expected:       []string{"D0, P[4], (!!map)::r: 10\nx: 1\ny: 2\n"},
-	},
 	{
 		description: "Get anchor",
 		document:    `a: &billyBob cat`,
@ -50,30 +21,6 @@ var anchorOperatorScenarios = []expressionScenario{
 			"D0, P[], (doc)::a: &foobar cat\n",
 		},
 	},
-	{
-		description: "Set anchor relatively using assign-update",
-		document:    `a: {b: cat}`,
-		expression:  `.a anchor |= .b`,
-		expected: []string{
-			"D0, P[], (doc)::a: &cat {b: cat}\n",
-		},
-	},
-	{
-		skipDoc:    true,
-		document:   `a: {c: cat}`,
-		expression: `.a anchor |= .b`,
-		expected: []string{
-			"D0, P[], (doc)::a: {c: cat}\n",
-		},
-	},
-	{
-		skipDoc:    true,
-		document:   `a: {c: cat}`,
-		expression: `.a anchor = .b`,
-		expected: []string{
-			"D0, P[], (doc)::a: {c: cat}\n",
-		},
-	},
 	{
 		description: "Get alias",
 		document:    `{b: &billyBob meow, a: *billyBob}`,
@ -90,38 +37,6 @@ var anchorOperatorScenarios = []expressionScenario{
 			"D0, P[], (doc)::{b: &meow purr, a: *meow}\n",
 		},
 	},
-	{
-		description: "Set alias to blank does nothing",
-		document:    `{b: &meow purr, a: cat}`,
-		expression:  `.a alias = ""`,
-		expected: []string{
-			"D0, P[], (doc)::{b: &meow purr, a: cat}\n",
-		},
-	},
-	{
-		skipDoc:    true,
-		document:   `{b: &meow purr, a: cat}`,
-		expression: `.a alias = .c`,
-		expected: []string{
-			"D0, P[], (doc)::{b: &meow purr, a: cat}\n",
-		},
-	},
-	{
-		skipDoc:    true,
-		document:   `{b: &meow purr, a: cat}`,
-		expression: `.a alias |= .c`,
-		expected: []string{
-			"D0, P[], (doc)::{b: &meow purr, a: cat}\n",
-		},
-	},
-	{
-		description: "Set alias relatively using assign-update",
-		document:    `{b: &meow purr, a: {f: meow}}`,
-		expression:  `.a alias |= .f`,
-		expected: []string{
-			"D0, P[], (doc)::{b: &meow purr, a: *meow}\n",
-		},
-	},
 	{
 		description: "Explode alias and anchor",
 		document:    `{f : {a: &a cat, b: *a}}`,
@ -160,9 +75,9 @@ bar:
    c: bar_c
 foobarList:
    b: bar_b
-    thing: foo_thing
-    c: foobarList_c
    a: foo_a
+    thing: bar_thing
+    c: foobarList_c
 foobar:
    c: foo_c
    a: foo_a
@ -175,7 +90,7 @@ foobar:
 		expression: `.foo* | explode(.) | (. style="flow")`,
 		expected: []string{
 			"D0, P[foo], (!!map)::{a: foo_a, thing: foo_thing, c: foo_c}\n",
-			"D0, P[foobarList], (!!map)::{b: bar_b, thing: foo_thing, c: foobarList_c, a: foo_a}\n",
+			"D0, P[foobarList], (!!map)::{b: bar_b, a: foo_a, thing: bar_thing, c: foobarList_c}\n",
 			"D0, P[foobar], (!!map)::{c: foo_c, a: foo_a, thing: foobar_thing}\n",
 		},
 	},
@ -185,7 +100,7 @@ foobar:
 		expression: `.foo* | explode(explode(.)) | (. style="flow")`,
 		expected: []string{
 			"D0, P[foo], (!!map)::{a: foo_a, thing: foo_thing, c: foo_c}\n",
-			"D0, P[foobarList], (!!map)::{b: bar_b, thing: foo_thing, c: foobarList_c, a: foo_a}\n",
+			"D0, P[foobarList], (!!map)::{b: bar_b, a: foo_a, thing: bar_thing, c: foobarList_c}\n",
 			"D0, P[foobar], (!!map)::{c: foo_c, a: foo_a, thing: foobar_thing}\n",
 		},
 	},
@ -199,7 +114,7 @@ foobar:
 	},
 }

-func TestAnchorAliasOperatorScenarios(t *testing.T) {
+func TestAnchorAliaseOperatorScenarios(t *testing.T) {
 	for _, tt := range anchorOperatorScenarios {
 		testScenario(t, &tt)
 	}
--- a/pkg/yqlib/operator_assign.go
+++ b/pkg/yqlib/operator_assign.go
@ -1,61 +1,72 @@
 package yqlib

-func assignUpdateOperator(d *dataTreeNavigator, context Context, expressionNode *ExpressionNode) (Context, error) {
-	lhs, err := d.GetMatchingNodes(context, expressionNode.Lhs)
+import "container/list"
+
+type AssignOpPreferences struct {
+	UpdateAssign bool
+}
+
+func AssignUpdateOperator(d *dataTreeNavigator, matchingNodes *list.List, pathNode *PathTreeNode) (*list.List, error) {
+	lhs, err := d.GetMatchingNodes(matchingNodes, pathNode.Lhs)
 	if err != nil {
-		return Context{}, err
+		return nil, err
 	}
-	var rhs Context
-	if !expressionNode.Operation.UpdateAssign {
-		rhs, err = d.GetMatchingNodes(context.ReadOnlyClone(), expressionNode.Rhs)
+	preferences := pathNode.Operation.Preferences.(*AssignOpPreferences)
+
+	var rhs *list.List
+	if !preferences.UpdateAssign {
+		rhs, err = d.GetMatchingNodes(matchingNodes, pathNode.Rhs)
 	}

-	for el := lhs.MatchingNodes.Front(); el != nil; el = el.Next() {
+	for el := lhs.Front(); el != nil; el = el.Next() {
 		candidate := el.Value.(*CandidateNode)

-		if expressionNode.Operation.UpdateAssign {
-			rhs, err = d.GetMatchingNodes(context.SingleChildContext(candidate), expressionNode.Rhs)
+		if preferences.UpdateAssign {
+			rhs, err = d.GetMatchingNodes(nodeToMap(candidate), pathNode.Rhs)
 		}

 		if err != nil {
-			return Context{}, err
+			return nil, err
 		}

 		// grab the first value
-		first := rhs.MatchingNodes.Front()
+		first := rhs.Front()

 		if first != nil {
 			rhsCandidate := first.Value.(*CandidateNode)
-			rhsCandidate.Node = unwrapDoc(rhsCandidate.Node)
+			rhsCandidate.Node = UnwrapDoc(rhsCandidate.Node)
 			candidate.UpdateFrom(rhsCandidate)
 		}
 	}
-
-	return context, nil
+	// // if there was nothing given, perhaps we are creating a new yaml doc
+	// if matchingNodes.Len() == 0 {
+	// 	log.Debug("started with nothing, returning LHS, %v", lhs.Len())
+	// 	return lhs, nil
+	// }
+	return matchingNodes, nil
 }

 // does not update content or values
-func assignAttributesOperator(d *dataTreeNavigator, context Context, expressionNode *ExpressionNode) (Context, error) {
-	log.Debug("getting lhs matching nodes for update")
-	lhs, err := d.GetMatchingNodes(context, expressionNode.Lhs)
+func AssignAttributesOperator(d *dataTreeNavigator, matchingNodes *list.List, pathNode *PathTreeNode) (*list.List, error) {
+	lhs, err := d.GetMatchingNodes(matchingNodes, pathNode.Lhs)
 	if err != nil {
-		return Context{}, err
+		return nil, err
 	}
-	for el := lhs.MatchingNodes.Front(); el != nil; el = el.Next() {
+	for el := lhs.Front(); el != nil; el = el.Next() {
 		candidate := el.Value.(*CandidateNode)

-		rhs, err := d.GetMatchingNodes(context.SingleReadonlyChildContext(candidate), expressionNode.Rhs)
+		rhs, err := d.GetMatchingNodes(nodeToMap(candidate), pathNode.Rhs)

 		if err != nil {
-			return Context{}, err
+			return nil, err
 		}

 		// grab the first value
-		first := rhs.MatchingNodes.Front()
+		first := rhs.Front()

 		if first != nil {
 			candidate.UpdateAttributesFrom(first.Value.(*CandidateNode))
 		}
 	}
-	return context, nil
+	return matchingNodes, nil
 }
--- a/pkg/yqlib/operator_assign_test.go
+++ b/pkg/yqlib/operator_assign_test.go
@ -12,22 +12,6 @@ var assignOperatorScenarios = []expressionScenario{
 			"D0, P[], ()::a:\n    b: cat\nx: frog\n",
 		},
 	},
-	{
-		skipDoc:    true,
-		document:   "{}",
-		expression: `.a |= .b`,
-		expected: []string{
-			"D0, P[], (doc)::{a: null}\n",
-		},
-	},
-	{
-		skipDoc:    true,
-		document:   "{}",
-		expression: `.a = .b`,
-		expected: []string{
-			"D0, P[], (doc)::{a: null}\n",
-		},
-	},
 	{
 		description: "Update node to be the child value",
 		document:    `{a: {b: {g: foof}}}`,
@ -159,5 +143,5 @@ func TestAssignOperatorScenarios(t *testing.T) {
 	for _, tt := range assignOperatorScenarios {
 		testScenario(t, &tt)
 	}
-	documentScenarios(t, "Assign (Update)", assignOperatorScenarios)
+	documentScenarios(t, "Assign", assignOperatorScenarios)
 }
--- a/pkg/yqlib/operator_booleans.go
+++ b/pkg/yqlib/operator_booleans.go
@ -2,13 +2,14 @@ package yqlib

 import (
 	"container/list"
-	"fmt"

 	yaml "gopkg.in/yaml.v3"
 )

-func isTruthyNode(node *yaml.Node) (bool, error) {
+func isTruthy(c *CandidateNode) (bool, error) {
+	node := UnwrapDoc(c.Node)
 	value := true
+
 	if node.Tag == "!!null" {
 		return false, nil
 	}
@ -22,146 +23,56 @@ func isTruthyNode(node *yaml.Node) (bool, error) {
 	return value, nil
 }

-func isTruthy(c *CandidateNode) (bool, error) {
-	node := unwrapDoc(c.Node)
-	return isTruthyNode(node)
-}
-
 type boolOp func(bool, bool) bool

-func performBoolOp(op boolOp) func(d *dataTreeNavigator, context Context, lhs *CandidateNode, rhs *CandidateNode) (*CandidateNode, error) {
-	return func(d *dataTreeNavigator, context Context, lhs *CandidateNode, rhs *CandidateNode) (*CandidateNode, error) {
-		owner := lhs
+func performBoolOp(op boolOp) func(d *dataTreeNavigator, lhs *CandidateNode, rhs *CandidateNode) (*CandidateNode, error) {
+	return func(d *dataTreeNavigator, lhs *CandidateNode, rhs *CandidateNode) (*CandidateNode, error) {
+		lhs.Node = UnwrapDoc(lhs.Node)
+		rhs.Node = UnwrapDoc(rhs.Node)

-		if lhs == nil && rhs == nil {
-			owner = &CandidateNode{}
-		} else if lhs == nil {
-			owner = rhs
+		lhsTrue, errDecoding := isTruthy(lhs)
+		if errDecoding != nil {
+			return nil, errDecoding
 		}

-		var errDecoding error
-		lhsTrue := false
-		if lhs != nil {
-			lhs.Node = unwrapDoc(lhs.Node)
-			lhsTrue, errDecoding = isTruthy(lhs)
-
-			if errDecoding != nil {
-				return nil, errDecoding
-			}
+		rhsTrue, errDecoding := isTruthy(rhs)
+		if errDecoding != nil {
+			return nil, errDecoding
 		}
-		log.Debugf("-- lhsTrue", lhsTrue)

-		rhsTrue := false
-		if rhs != nil {
-			rhs.Node = unwrapDoc(rhs.Node)
-			rhsTrue, errDecoding = isTruthy(rhs)
-			if errDecoding != nil {
-				return nil, errDecoding
-			}
-		}
-		log.Debugf("-- rhsTrue", rhsTrue)
-
-		return createBooleanCandidate(owner, op(lhsTrue, rhsTrue)), nil
+		return createBooleanCandidate(lhs, op(lhsTrue, rhsTrue)), nil
 	}
 }

-func findBoolean(wantBool bool, d *dataTreeNavigator, context Context, expressionNode *ExpressionNode, sequenceNode *yaml.Node) (bool, error) {
-	for _, node := range sequenceNode.Content {
-
-		if expressionNode != nil {
-			//need to evaluate the expression against the node
-			candidate := &CandidateNode{Node: node}
-			rhs, err := d.GetMatchingNodes(context.SingleReadonlyChildContext(candidate), expressionNode)
-			if err != nil {
-				return false, err
-			}
-			if rhs.MatchingNodes.Len() > 0 {
-				node = rhs.MatchingNodes.Front().Value.(*CandidateNode).Node
-			} else {
-				// no results found, ignore this entry
-				continue
-			}
-		}
-
-		truthy, err := isTruthyNode(node)
-		if err != nil {
-			return false, err
-		}
-		if truthy == wantBool {
-			return true, nil
-		}
-	}
-	return false, nil
-}
-
-func allOperator(d *dataTreeNavigator, context Context, expressionNode *ExpressionNode) (Context, error) {
-	var results = list.New()
-
-	for el := context.MatchingNodes.Front(); el != nil; el = el.Next() {
-		candidate := el.Value.(*CandidateNode)
-		candidateNode := unwrapDoc(candidate.Node)
-		if candidateNode.Kind != yaml.SequenceNode {
-			return Context{}, fmt.Errorf("any only supports arrays, was %v", candidateNode.Tag)
-		}
-		booleanResult, err := findBoolean(false, d, context, expressionNode.Rhs, candidateNode)
-		if err != nil {
-			return Context{}, err
-		}
-		result := createBooleanCandidate(candidate, !booleanResult)
-		results.PushBack(result)
-	}
-	return context.ChildContext(results), nil
-}
-
-func anyOperator(d *dataTreeNavigator, context Context, expressionNode *ExpressionNode) (Context, error) {
-	var results = list.New()
-
-	for el := context.MatchingNodes.Front(); el != nil; el = el.Next() {
-		candidate := el.Value.(*CandidateNode)
-		candidateNode := unwrapDoc(candidate.Node)
-		if candidateNode.Kind != yaml.SequenceNode {
-			return Context{}, fmt.Errorf("any only supports arrays, was %v", candidateNode.Tag)
-		}
-		booleanResult, err := findBoolean(true, d, context, expressionNode.Rhs, candidateNode)
-		if err != nil {
-			return Context{}, err
-		}
-		result := createBooleanCandidate(candidate, booleanResult)
-		results.PushBack(result)
-	}
-	return context.ChildContext(results), nil
-}
-
-func orOperator(d *dataTreeNavigator, context Context, expressionNode *ExpressionNode) (Context, error) {
+func OrOperator(d *dataTreeNavigator, matchingNodes *list.List, pathNode *PathTreeNode) (*list.List, error) {
 	log.Debugf("-- orOp")
-	return crossFunction(d, context.ReadOnlyClone(), expressionNode, performBoolOp(
+	return crossFunction(d, matchingNodes, pathNode, performBoolOp(
 		func(b1 bool, b2 bool) bool {
-			log.Debugf("-- peformingOrOp with %v and %v", b1, b2)
 			return b1 || b2
-		}), true)
+		}))
 }

-func andOperator(d *dataTreeNavigator, context Context, expressionNode *ExpressionNode) (Context, error) {
+func AndOperator(d *dataTreeNavigator, matchingNodes *list.List, pathNode *PathTreeNode) (*list.List, error) {
 	log.Debugf("-- AndOp")
-	return crossFunction(d, context.ReadOnlyClone(), expressionNode, performBoolOp(
+	return crossFunction(d, matchingNodes, pathNode, performBoolOp(
 		func(b1 bool, b2 bool) bool {
 			return b1 && b2
-		}), true)
+		}))
 }

-func notOperator(d *dataTreeNavigator, context Context, expressionNode *ExpressionNode) (Context, error) {
+func NotOperator(d *dataTreeNavigator, matchMap *list.List, pathNode *PathTreeNode) (*list.List, error) {
 	log.Debugf("-- notOperation")
 	var results = list.New()

-	for el := context.MatchingNodes.Front(); el != nil; el = el.Next() {
+	for el := matchMap.Front(); el != nil; el = el.Next() {
 		candidate := el.Value.(*CandidateNode)
 		log.Debug("notOperation checking %v", candidate)
 		truthy, errDecoding := isTruthy(candidate)
 		if errDecoding != nil {
-			return Context{}, errDecoding
+			return nil, errDecoding
 		}
 		result := createBooleanCandidate(candidate, !truthy)
 		results.PushBack(result)
 	}
-	return context.ChildContext(results), nil
+	return results, nil
 }
--- a/pkg/yqlib/operator_booleans_test.go
+++ b/pkg/yqlib/operator_booleans_test.go
@ -6,38 +6,14 @@ import (

 var booleanOperatorScenarios = []expressionScenario{
 	{
-		description: "`or` example",
+		description: "OR example",
 		expression:  `true or false`,
 		expected: []string{
 			"D0, P[], (!!bool)::true\n",
 		},
 	},
 	{
-		skipDoc:    true,
-		document:   "b: hi",
-		expression: `.a or .c`,
-		expected: []string{
-			"D0, P[], (!!bool)::false\n",
-		},
-	},
-	{
-		skipDoc:    true,
-		document:   "b: hi",
-		expression: `select(.a or .b)`,
-		expected: []string{
-			"D0, P[], (doc)::b: hi\n",
-		},
-	},
-	{
-		skipDoc:    true,
-		document:   "b: hi",
-		expression: `select((.a and .b) | not)`,
-		expected: []string{
-			"D0, P[], (doc)::b: hi\n",
-		},
-	},
-	{
-		description: "`and` example",
+		description: "AND example",
 		expression:  `true and false`,
 		expected: []string{
 			"D0, P[], (!!bool)::false\n",
@ -51,86 +27,6 @@ var booleanOperatorScenarios = []expressionScenario{
 			"D0, P[], (!!seq)::- {a: bird, b: dog}\n- {a: cat, b: fly}\n",
 		},
 	},
-	{
-		description: "`any` returns true if any boolean in a given array is true",
-		document:    `[false, true]`,
-		expression:  "any",
-		expected: []string{
-			"D0, P[], (!!bool)::true\n",
-		},
-	},
-	{
-		description: "`any` returns false for an empty array",
-		document:    `[]`,
-		expression:  "any",
-		expected: []string{
-			"D0, P[], (!!bool)::false\n",
-		},
-	},
-	{
-		description: "`any_c` returns true if any element in the array is true for the given condition.",
-		document:    "a: [rad, awesome]\nb: [meh, whatever]",
-		expression:  `.[] |= any_c(. == "awesome")`,
-		expected: []string{
-			"D0, P[], (doc)::a: true\nb: false\n",
-		},
-	},
-	{
-		skipDoc:    true,
-		document:   `[{pet: cat}]`,
-		expression: `any_c(.name == "harry") as $c`,
-		expected: []string{
-			"D0, P[], (doc)::[{pet: cat}]\n",
-		},
-	},
-	{
-		skipDoc:    true,
-		document:   `[{pet: cat}]`,
-		expression: `all_c(.name == "harry") as $c`,
-		expected: []string{
-			"D0, P[], (doc)::[{pet: cat}]\n",
-		},
-	},
-	{
-		skipDoc:    true,
-		document:   `[false, false]`,
-		expression: "any",
-		expected: []string{
-			"D0, P[], (!!bool)::false\n",
-		},
-	},
-	{
-		description: "`all` returns true if all booleans in a given array are true",
-		document:    `[true, true]`,
-		expression:  "all",
-		expected: []string{
-			"D0, P[], (!!bool)::true\n",
-		},
-	},
-	{
-		skipDoc:    true,
-		document:   `[false, true]`,
-		expression: "all",
-		expected: []string{
-			"D0, P[], (!!bool)::false\n",
-		},
-	},
-	{
-		description: "`all` returns true for an empty array",
-		document:    `[]`,
-		expression:  "all",
-		expected: []string{
-			"D0, P[], (!!bool)::true\n",
-		},
-	},
-	{
-		description: "`all_c` returns true if all elements in the array are true for the given condition.",
-		document:    "a: [rad, awesome]\nb: [meh, 12]",
-		expression:  `.[] |= all_c(tag == "!!str")`,
-		expected: []string{
-			"D0, P[], (doc)::a: true\nb: false\n",
-		},
-	},
 	{
 		skipDoc:    true,
 		expression: `false or false`,
@ -149,22 +45,6 @@ var booleanOperatorScenarios = []expressionScenario{
 			"D0, P[b], (!!bool)::true\n",
 		},
 	},
-	{
-		skipDoc:    true,
-		document:   `{}`,
-		expression: `(.a.b or .c) as $x`,
-		expected: []string{
-			"D0, P[], (doc)::{}\n",
-		},
-	},
-	{
-		skipDoc:    true,
-		document:   `{}`,
-		expression: `(.a.b and .c) as $x`,
-		expected: []string{
-			"D0, P[], (doc)::{}\n",
-		},
-	},
 	{
 		description: "Not true is false",
 		expression:  `true | not`,
--- a/pkg/yqlib/operator_collect.go
+++ b/pkg/yqlib/operator_collect.go
@ -6,35 +6,34 @@ import (
 	yaml "gopkg.in/yaml.v3"
 )

-func collectOperator(d *dataTreeNavigator, context Context, expressionNode *ExpressionNode) (Context, error) {
+func CollectOperator(d *dataTreeNavigator, matchMap *list.List, pathNode *PathTreeNode) (*list.List, error) {
 	log.Debugf("-- collectOperation")

-	if context.MatchingNodes.Len() == 0 {
+	if matchMap.Len() == 0 {
 		node := &yaml.Node{Kind: yaml.SequenceNode, Tag: "!!seq", Value: "[]"}
 		candidate := &CandidateNode{Node: node}
-		return context.SingleChildContext(candidate), nil
+		return nodeToMap(candidate), nil
 	}

 	var results = list.New()

 	node := &yaml.Node{Kind: yaml.SequenceNode, Tag: "!!seq"}
-	var collectC *CandidateNode
-	if context.MatchingNodes.Front() != nil {
-		collectC = context.MatchingNodes.Front().Value.(*CandidateNode).CreateChild(nil, node)
-		if len(collectC.Path) > 0 {
-			collectC.Path = collectC.Path[:len(collectC.Path)-1]
-		}
-	} else {
-		collectC = &CandidateNode{Node: node}
-	}

-	for el := context.MatchingNodes.Front(); el != nil; el = el.Next() {
+	var document uint = 0
+	var path []interface{}
+
+	for el := matchMap.Front(); el != nil; el = el.Next() {
 		candidate := el.Value.(*CandidateNode)
 		log.Debugf("Collecting %v", NodeToString(candidate))
-		node.Content = append(node.Content, unwrapDoc(candidate.Node))
+		if path == nil && candidate.Path != nil && len(candidate.Path) > 1 {
+			path = candidate.Path[:len(candidate.Path)-1]
+			document = candidate.Document
+		}
+		node.Content = append(node.Content, candidate.Node)
 	}

+	collectC := &CandidateNode{Node: node, Document: document, Path: path}
 	results.PushBack(collectC)

-	return context.ChildContext(results), nil
+	return results, nil
 }
--- a/pkg/yqlib/operator_collect_object.go
+++ b/pkg/yqlib/operator_collect_object.go
@ -17,86 +17,92 @@ import (
 ...
 */

-func collectObjectOperator(d *dataTreeNavigator, originalContext Context, expressionNode *ExpressionNode) (Context, error) {
+func CollectObjectOperator(d *dataTreeNavigator, matchMap *list.List, pathNode *PathTreeNode) (*list.List, error) {
 	log.Debugf("-- collectObjectOperation")

-	context := originalContext.Clone()
-	context.DontAutoCreate = false
-
-	if context.MatchingNodes.Len() == 0 {
+	if matchMap.Len() == 0 {
 		node := &yaml.Node{Kind: yaml.MappingNode, Tag: "!!map", Value: "{}"}
 		candidate := &CandidateNode{Node: node}
-		return context.SingleChildContext(candidate), nil
+		return nodeToMap(candidate), nil
 	}
-	first := context.MatchingNodes.Front().Value.(*CandidateNode)
+	first := matchMap.Front().Value.(*CandidateNode)
 	var rotated []*list.List = make([]*list.List, len(first.Node.Content))

 	for i := 0; i < len(first.Node.Content); i++ {
 		rotated[i] = list.New()
 	}

-	for el := context.MatchingNodes.Front(); el != nil; el = el.Next() {
+	for el := matchMap.Front(); el != nil; el = el.Next() {
 		candidateNode := el.Value.(*CandidateNode)
 		for i := 0; i < len(first.Node.Content); i++ {
-			rotated[i].PushBack(candidateNode.CreateChild(i, candidateNode.Node.Content[i]))
+			rotated[i].PushBack(createChildCandidate(candidateNode, i))
 		}
 	}

 	newObject := list.New()
 	for i := 0; i < len(first.Node.Content); i++ {
-		additions, err := collect(d, context.ChildContext(list.New()), rotated[i])
+		additions, err := collect(d, list.New(), rotated[i])
 		if err != nil {
-			return Context{}, err
+			return nil, err
 		}
-		newObject.PushBackList(additions.MatchingNodes)
+		newObject.PushBackList(additions)
 	}

-	return context.ChildContext(newObject), nil
+	return newObject, nil

 }

-func collect(d *dataTreeNavigator, context Context, remainingMatches *list.List) (Context, error) {
+func createChildCandidate(candidate *CandidateNode, index int) *CandidateNode {
+	return &CandidateNode{
+		Document: candidate.Document,
+		Path:     candidate.CreateChildPath(index),
+		Filename: candidate.Filename,
+		Node:     candidate.Node.Content[index],
+	}
+}
+
+func collect(d *dataTreeNavigator, aggregate *list.List, remainingMatches *list.List) (*list.List, error) {
 	if remainingMatches.Len() == 0 {
-		return context, nil
+		return aggregate, nil
 	}

 	candidate := remainingMatches.Remove(remainingMatches.Front()).(*CandidateNode)

-	splatted, err := splat(d, context.SingleChildContext(candidate),
-		traversePreferences{DontFollowAlias: true, IncludeMapKeys: false})
+	splatted, err := Splat(d, nodeToMap(candidate),
+		&TraversePreferences{FollowAlias: false, IncludeMapKeys: false})

-	for splatEl := splatted.MatchingNodes.Front(); splatEl != nil; splatEl = splatEl.Next() {
+	for splatEl := splatted.Front(); splatEl != nil; splatEl = splatEl.Next() {
 		splatEl.Value.(*CandidateNode).Path = nil
 	}

 	if err != nil {
-		return Context{}, err
+		return nil, err
 	}

-	if context.MatchingNodes.Len() == 0 {
+	if aggregate.Len() == 0 {
 		return collect(d, splatted, remainingMatches)
 	}

 	newAgg := list.New()

-	for el := context.MatchingNodes.Front(); el != nil; el = el.Next() {
+	for el := aggregate.Front(); el != nil; el = el.Next() {
 		aggCandidate := el.Value.(*CandidateNode)
-		for splatEl := splatted.MatchingNodes.Front(); splatEl != nil; splatEl = splatEl.Next() {
+		for splatEl := splatted.Front(); splatEl != nil; splatEl = splatEl.Next() {
 			splatCandidate := splatEl.Value.(*CandidateNode)
 			newCandidate, err := aggCandidate.Copy()
 			if err != nil {
-				return Context{}, err
+				return nil, err
 			}

 			newCandidate.Path = nil

-			newCandidate, err = multiply(multiplyPreferences{AppendArrays: false})(d, context, newCandidate, splatCandidate)
+			newCandidate, err = multiply(&MultiplyPreferences{AppendArrays: false})(d, newCandidate, splatCandidate)
 			if err != nil {
-				return Context{}, err
+				return nil, err
 			}
 			newAgg.PushBack(newCandidate)
 		}
 	}
-	return collect(d, context.ChildContext(newAgg), remainingMatches)
+	return collect(d, newAgg, remainingMatches)

 }
--- a/pkg/yqlib/operator_collect_object_test.go
+++ b/pkg/yqlib/operator_collect_object_test.go
@ -5,30 +5,6 @@ import (
 )

 var collectObjectOperatorScenarios = []expressionScenario{
-	{
-		skipDoc:    true,
-		document:   "a: []",
-		expression: `.a += [{"key": "att2", "value": "val2"}]`,
-		expected: []string{
-			"D0, P[], (doc)::a: [{key: att2, value: val2}]\n",
-		},
-	},
-	{
-		skipDoc:    true,
-		document:   "",
-		expression: `.a += {"key": "att2", "value": "val2"}`,
-		expected: []string{
-			"D0, P[], ()::a:\n    key: att2\n    value: val2\n",
-		},
-	},
-	{
-		skipDoc:    true,
-		document:   "",
-		expression: `.a += [0]`,
-		expected: []string{
-			"D0, P[], ()::a:\n    - 0\n",
-		},
-	},
 	{
 		description: `Collect empty object`,
 		document:    ``,
@ -134,5 +110,5 @@ func TestCollectObjectOperatorScenarios(t *testing.T) {
 	for _, tt := range collectObjectOperatorScenarios {
 		testScenario(t, &tt)
 	}
-	documentScenarios(t, "Create, Collect into Object", collectObjectOperatorScenarios)
+	documentScenarios(t, "Collect into Object", collectObjectOperatorScenarios)
 }
--- a/pkg/yqlib/operator_collect_test.go
+++ b/pkg/yqlib/operator_collect_test.go
@ -5,14 +5,6 @@ import (
 )

 var collectOperatorScenarios = []expressionScenario{
-	{
-		skipDoc:    true,
-		document:   ``,
-		expression: `.a += [0]`,
-		expected: []string{
-			"D0, P[], ()::a:\n    - 0\n",
-		},
-	},
 	{
 		description: "Collect empty",
 		document:    ``,
@ -21,15 +13,6 @@ var collectOperatorScenarios = []expressionScenario{
 			"D0, P[], (!!seq)::[]\n",
 		},
 	},
-	{
-		skipDoc:  true,
-		document: "{a: apple}\n---\n{b: frog}",
-
-		expression: `[.]`,
-		expected: []string{
-			"D0, P[], (!!seq)::- {a: apple}\n- {b: frog}\n",
-		},
-	},
 	{
 		skipDoc:    true,
 		document:   ``,
--- a/pkg/yqlib/operator_comments.go
+++ b/pkg/yqlib/operator_comments.go
@ -4,53 +4,38 @@ import (
 	"container/list"
 	"strings"

-	yaml "gopkg.in/yaml.v3"
+	"gopkg.in/yaml.v3"
 )

-type commentOpPreferences struct {
+type CommentOpPreferences struct {
 	LineComment bool
 	HeadComment bool
 	FootComment bool
 }

-func assignCommentsOperator(d *dataTreeNavigator, context Context, expressionNode *ExpressionNode) (Context, error) {
+func AssignCommentsOperator(d *dataTreeNavigator, matchingNodes *list.List, pathNode *PathTreeNode) (*list.List, error) {

 	log.Debugf("AssignComments operator!")

-	lhs, err := d.GetMatchingNodes(context, expressionNode.Lhs)
+	rhs, err := d.GetMatchingNodes(matchingNodes, pathNode.Rhs)
+	if err != nil {
+		return nil, err
+	}
+	comment := ""
+	if rhs.Front() != nil {
+		comment = rhs.Front().Value.(*CandidateNode).Node.Value
+	}
+
+	lhs, err := d.GetMatchingNodes(matchingNodes, pathNode.Lhs)

 	if err != nil {
-		return Context{}, err
+		return nil, err
 	}

-	preferences := expressionNode.Operation.Preferences.(commentOpPreferences)
+	preferences := pathNode.Operation.Preferences.(*CommentOpPreferences)

-	comment := ""
-	if !expressionNode.Operation.UpdateAssign {
-		rhs, err := d.GetMatchingNodes(context.ReadOnlyClone(), expressionNode.Rhs)
-		if err != nil {
-			return Context{}, err
-		}
-
-		if rhs.MatchingNodes.Front() != nil {
-			comment = rhs.MatchingNodes.Front().Value.(*CandidateNode).Node.Value
-		}
-	}
-
-	for el := lhs.MatchingNodes.Front(); el != nil; el = el.Next() {
+	for el := lhs.Front(); el != nil; el = el.Next() {
 		candidate := el.Value.(*CandidateNode)
-
-		if expressionNode.Operation.UpdateAssign {
-			rhs, err := d.GetMatchingNodes(context.SingleReadonlyChildContext(candidate), expressionNode.Rhs)
-			if err != nil {
-				return Context{}, err
-			}
-
-			if rhs.MatchingNodes.Front() != nil {
-				comment = rhs.MatchingNodes.Front().Value.(*CandidateNode).Node.Value
-			}
-		}
-
 		log.Debugf("Setting comment of : %v", candidate.GetKey())
 		if preferences.LineComment {
 			candidate.Node.LineComment = comment
@ -63,15 +48,15 @@ func assignCommentsOperator(d *dataTreeNavigator, context Context, expressionNod
 		}

 	}
-	return context, nil
+	return matchingNodes, nil
 }

-func getCommentsOperator(d *dataTreeNavigator, context Context, expressionNode *ExpressionNode) (Context, error) {
-	preferences := expressionNode.Operation.Preferences.(commentOpPreferences)
+func GetCommentsOperator(d *dataTreeNavigator, matchingNodes *list.List, pathNode *PathTreeNode) (*list.List, error) {
+	preferences := pathNode.Operation.Preferences.(*CommentOpPreferences)
 	log.Debugf("GetComments operator!")
 	var results = list.New()

-	for el := context.MatchingNodes.Front(); el != nil; el = el.Next() {
+	for el := matchingNodes.Front(); el != nil; el = el.Next() {
 		candidate := el.Value.(*CandidateNode)
 		comment := ""
 		if preferences.LineComment {
@ -84,8 +69,8 @@ func getCommentsOperator(d *dataTreeNavigator, context Context, expressionNode *
 		comment = strings.Replace(comment, "# ", "", 1)

 		node := &yaml.Node{Kind: yaml.ScalarNode, Value: comment, Tag: "!!str"}
-		result := candidate.CreateChild(nil, node)
-		results.PushBack(result)
+		lengthCand := &CandidateNode{Node: node, Document: candidate.Document, Path: candidate.Path}
+		results.PushBack(lengthCand)
 	}
-	return context.ChildContext(results), nil
+	return results, nil
 }
--- a/pkg/yqlib/operator_comments_test.go
+++ b/pkg/yqlib/operator_comments_test.go
@ -13,39 +13,6 @@ var commentOperatorScenarios = []expressionScenario{
 			"D0, P[], (doc)::a: cat # single\n",
 		},
 	},
-	{
-		skipDoc:    true,
-		document:   "a: cat\nb: dog",
-		expression: `.a lineComment=.b`,
-		expected: []string{
-			"D0, P[], (doc)::a: cat # dog\nb: dog\n",
-		},
-	},
-	{
-		skipDoc:    true,
-		document:   "a: cat\n---\na: dog",
-		expression: `.a lineComment |= documentIndex`,
-		expected: []string{
-			"D0, P[], (doc)::a: cat # 0\n",
-			"D1, P[], (doc)::a: dog # 1\n",
-		},
-	},
-	{
-		description: "Use update assign to perform relative updates",
-		document:    "a: cat\nb: dog",
-		expression:  `.. lineComment |= .`,
-		expected: []string{
-			"D0, P[], (!!map)::a: cat # cat\nb: dog # dog\n",
-		},
-	},
-	{
-		skipDoc:    true,
-		document:   "a: cat\nb: dog",
-		expression: `.. comments |= .`,
-		expected: []string{
-			"D0, P[], (!!map)::a: cat # cat\n# cat\n\n# cat\nb: dog # dog\n# dog\n\n# dog\n",
-		},
-	},
 	{
 		description: "Set head comment",
 		document:    `a: cat`,
@ -62,22 +29,6 @@ var commentOperatorScenarios = []expressionScenario{
 			"D0, P[], (doc)::a: cat\n\n# cat\n",
 		},
 	},
-	{
-		skipDoc:    true,
-		document:   `a: cat`,
-		expression: `. footComment=.b.d`,
-		expected: []string{
-			"D0, P[], (doc)::a: cat\n",
-		},
-	},
-	{
-		skipDoc:    true,
-		document:   `a: cat`,
-		expression: `. footComment|=.b.d`,
-		expected: []string{
-			"D0, P[], (doc)::a: cat\n",
-		},
-	},
 	{
 		description: "Remove comment",
 		document:    "a: cat # comment\nb: dog # leave this",
@ -87,12 +38,11 @@ var commentOperatorScenarios = []expressionScenario{
 		},
 	},
 	{
-		description:    "Remove (strip) all comments",
-		subdescription: "Note the use of `...` to ensure key nodes are included.",
-		document:       "# hi\n\na: cat # comment\n\n# great\n\nb: # key comment",
-		expression:     `... comments=""`,
+		description: "Remove all comments",
+		document:    "# hi\n\na: cat # comment\n\n# great\n",
+		expression:  `.. comments=""`,
 		expected: []string{
-			"D0, P[], (!!map)::a: cat\nb:\n",
+			"D0, P[], (!!map)::a: cat\n",
 		},
 	},
 	{
--- a/pkg/yqlib/operator_create_map.go
+++ b/pkg/yqlib/operator_create_map.go
@ -6,7 +6,7 @@ import (
 	"gopkg.in/yaml.v3"
 )

-func createMapOperator(d *dataTreeNavigator, context Context, expressionNode *ExpressionNode) (Context, error) {
+func CreateMapOperator(d *dataTreeNavigator, matchingNodes *list.List, pathNode *PathTreeNode) (*list.List, error) {
 	log.Debugf("-- createMapOperation")

 	//each matchingNodes entry should turn into a sequence of keys to create.
@ -18,29 +18,29 @@ func createMapOperator(d *dataTreeNavigator, context Context, expressionNode *Ex

 	sequences := list.New()

-	if context.MatchingNodes.Len() > 0 {
+	if matchingNodes.Len() > 0 {

-		for matchingNodeEl := context.MatchingNodes.Front(); matchingNodeEl != nil; matchingNodeEl = matchingNodeEl.Next() {
+		for matchingNodeEl := matchingNodes.Front(); matchingNodeEl != nil; matchingNodeEl = matchingNodeEl.Next() {
 			matchingNode := matchingNodeEl.Value.(*CandidateNode)
-			sequenceNode, err := sequenceFor(d, context, matchingNode, expressionNode)
+			sequenceNode, err := sequenceFor(d, matchingNode, pathNode)
 			if err != nil {
-				return Context{}, err
+				return nil, err
 			}
 			sequences.PushBack(sequenceNode)
 		}
 	} else {
-		sequenceNode, err := sequenceFor(d, context, nil, expressionNode)
+		sequenceNode, err := sequenceFor(d, nil, pathNode)
 		if err != nil {
-			return Context{}, err
+			return nil, err
 		}
 		sequences.PushBack(sequenceNode)
 	}

-	return context.SingleChildContext(&CandidateNode{Node: listToNodeSeq(sequences), Document: document, Path: path}), nil
+	return nodeToMap(&CandidateNode{Node: listToNodeSeq(sequences), Document: document, Path: path}), nil

 }

-func sequenceFor(d *dataTreeNavigator, context Context, matchingNode *CandidateNode, expressionNode *ExpressionNode) (*CandidateNode, error) {
+func sequenceFor(d *dataTreeNavigator, matchingNode *CandidateNode, pathNode *PathTreeNode) (*CandidateNode, error) {
 	var path []interface{}
 	var document uint = 0
 	var matches = list.New()
@ -48,26 +48,26 @@ func sequenceFor(d *dataTreeNavigator, context Context, matchingNode *CandidateN
 	if matchingNode != nil {
 		path = matchingNode.Path
 		document = matchingNode.Document
-		matches.PushBack(matchingNode)
+		matches = nodeToMap(matchingNode)
 	}

-	mapPairs, err := crossFunction(d, context.ChildContext(matches), expressionNode,
-		func(d *dataTreeNavigator, context Context, lhs *CandidateNode, rhs *CandidateNode) (*CandidateNode, error) {
+	mapPairs, err := crossFunction(d, matches, pathNode,
+		func(d *dataTreeNavigator, lhs *CandidateNode, rhs *CandidateNode) (*CandidateNode, error) {
 			node := yaml.Node{Kind: yaml.MappingNode, Tag: "!!map"}
 			log.Debugf("LHS:", NodeToString(lhs))
 			log.Debugf("RHS:", NodeToString(rhs))
 			node.Content = []*yaml.Node{
-				unwrapDoc(lhs.Node),
-				unwrapDoc(rhs.Node),
+				UnwrapDoc(lhs.Node),
+				UnwrapDoc(rhs.Node),
 			}

 			return &CandidateNode{Node: &node, Document: document, Path: path}, nil
-		}, false)
+		})

 	if err != nil {
 		return nil, err
 	}
-	innerList := listToNodeSeq(mapPairs.MatchingNodes)
+	innerList := listToNodeSeq(mapPairs)
 	innerList.Style = yaml.FlowStyle
 	return &CandidateNode{Node: innerList, Document: document, Path: path}, nil
 }
--- a/pkg/yqlib/operator_delete.go
+++ b/pkg/yqlib/operator_delete.go
@ -1,45 +1,70 @@
 package yqlib

 import (
+	"container/list"
 	"fmt"

 	yaml "gopkg.in/yaml.v3"
 )

-func deleteChildOperator(d *dataTreeNavigator, context Context, expressionNode *ExpressionNode) (Context, error) {
-	nodesToDelete, err := d.GetMatchingNodes(context.ReadOnlyClone(), expressionNode.Rhs)
+func DeleteChildOperator(d *dataTreeNavigator, matchingNodes *list.List, pathNode *PathTreeNode) (*list.List, error) {
+
+	nodesToDelete, err := d.GetMatchingNodes(matchingNodes, pathNode.Rhs)

 	if err != nil {
-		return Context{}, err
+		return nil, err
 	}
-	//need to iterate backwards to ensure correct indices when deleting multiple
-	for el := nodesToDelete.MatchingNodes.Back(); el != nil; el = el.Prev() {
+
+	for el := nodesToDelete.Front(); el != nil; el = el.Next() {
 		candidate := el.Value.(*CandidateNode)

-		//problem: context may already be '.a' and then I pass in '.a.a2'.
-		// should pass in .a2.
-		if candidate.Parent == nil {
-			log.Info("Could not find parent of %v", candidate.GetKey())
-			return context, nil
+		deleteImmediateChildOp := &Operation{
+			OperationType: DeleteImmediateChild,
+			Value:         candidate.Path[len(candidate.Path)-1],
 		}

-		parentNode := candidate.Parent.Node
-		childPath := candidate.Path[len(candidate.Path)-1]
+		deleteImmediateChildOpNode := &PathTreeNode{
+			Operation: deleteImmediateChildOp,
+			Rhs:       createTraversalTree(candidate.Path[0 : len(candidate.Path)-1]),
+		}

-		if parentNode.Kind == yaml.MappingNode {
-			deleteFromMap(candidate.Parent, childPath)
-		} else if parentNode.Kind == yaml.SequenceNode {
-			deleteFromArray(candidate.Parent, childPath)
-		} else {
-			return Context{}, fmt.Errorf("Cannot delete nodes from parent of tag %v", parentNode.Tag)
+		_, err := d.GetMatchingNodes(matchingNodes, deleteImmediateChildOpNode)
+		if err != nil {
+			return nil, err
 		}
 	}
-	return context, nil
+	return matchingNodes, nil
+}
+
+func DeleteImmediateChildOperator(d *dataTreeNavigator, matchingNodes *list.List, pathNode *PathTreeNode) (*list.List, error) {
+	parents, err := d.GetMatchingNodes(matchingNodes, pathNode.Rhs)
+
+	if err != nil {
+		return nil, err
+	}
+
+	childPath := pathNode.Operation.Value
+
+	log.Debug("childPath to remove %v", childPath)
+
+	for el := parents.Front(); el != nil; el = el.Next() {
+		parent := el.Value.(*CandidateNode)
+		parentNode := UnwrapDoc(parent.Node)
+		if parentNode.Kind == yaml.MappingNode {
+			deleteFromMap(parent, childPath)
+		} else if parentNode.Kind == yaml.SequenceNode {
+			deleteFromArray(parent, childPath)
+		} else {
+			return nil, fmt.Errorf("Cannot delete nodes from parent of tag %v", parentNode.Tag)
+		}
+
+	}
+	return matchingNodes, nil
 }

 func deleteFromMap(candidate *CandidateNode, childPath interface{}) {
 	log.Debug("deleteFromMap")
-	node := unwrapDoc(candidate.Node)
+	node := UnwrapDoc(candidate.Node)
 	contents := node.Content
 	newContents := make([]*yaml.Node, 0)

@ -47,7 +72,11 @@ func deleteFromMap(candidate *CandidateNode, childPath interface{}) {
 		key := contents[index]
 		value := contents[index+1]

-		childCandidate := candidate.CreateChild(key.Value, value)
+		childCandidate := &CandidateNode{
+			Node:     value,
+			Document: candidate.Document,
+			Path:     candidate.CreateChildPath(key.Value),
+		}

 		shouldDelete := key.Value == childPath

@ -62,7 +91,7 @@ func deleteFromMap(candidate *CandidateNode, childPath interface{}) {

 func deleteFromArray(candidate *CandidateNode, childPath interface{}) {
 	log.Debug("deleteFromArray")
-	node := unwrapDoc(candidate.Node)
+	node := UnwrapDoc(candidate.Node)
 	contents := node.Content
 	newContents := make([]*yaml.Node, 0)

--- a/pkg/yqlib/operator_delete_test.go
+++ b/pkg/yqlib/operator_delete_test.go
@ -21,70 +21,6 @@ var deleteOperatorScenarios = []expressionScenario{
 			"D0, P[], (doc)::{a: {a2: frood}}\n",
 		},
 	},
-	{
-		skipDoc:    true,
-		document:   `{a: {a1: fred, a2: frood}}`,
-		expression: `.a | del(.a1)`,
-		expected: []string{
-			"D0, P[a], (!!map)::{a2: frood}\n",
-		},
-	},
-	{
-		skipDoc:    true,
-		document:   `a: [1,2,3]`,
-		expression: `.a | del(.[1])`,
-		expected: []string{
-			"D0, P[a], (!!seq)::[1, 3]\n",
-		},
-	},
-	{
-		skipDoc:    true,
-		document:   `[0, {a: cat, b: dog}]`,
-		expression: `.[1] | del(.a)`,
-		expected: []string{
-			"D0, P[1], (!!map)::{b: dog}\n",
-		},
-	},
-	{
-		skipDoc:    true,
-		document:   `[{a: cat, b: dog}]`,
-		expression: `.[0] | del(.a)`,
-		expected: []string{
-			"D0, P[0], (!!map)::{b: dog}\n",
-		},
-	},
-	{
-		skipDoc:    true,
-		document:   `[{a: {b: thing, c: frog}}]`,
-		expression: `.[0].a | del(.b)`,
-		expected: []string{
-			"D0, P[0 a], (!!map)::{c: frog}\n",
-		},
-	},
-	{
-		skipDoc:    true,
-		document:   `[{a: {b: thing, c: frog}}]`,
-		expression: `.[0] | del(.a.b)`,
-		expected: []string{
-			"D0, P[0], (!!map)::{a: {c: frog}}\n",
-		},
-	},
-	{
-		skipDoc:    true,
-		document:   `{a: [0, {b: thing, c: frog}]}`,
-		expression: `.a[1] | del(.b)`,
-		expected: []string{
-			"D0, P[a 1], (!!map)::{c: frog}\n",
-		},
-	},
-	{
-		skipDoc:    true,
-		document:   `{a: [0, {b: thing, c: frog}]}`,
-		expression: `.a | del(.[1].b)`,
-		expected: []string{
-			"D0, P[a], (!!seq)::[0, {c: frog}]\n",
-		},
-	},
 	{
 		skipDoc:    true,
 		document:   `{a: {a1: fred, a2: frood}}`,
@ -101,38 +37,6 @@ var deleteOperatorScenarios = []expressionScenario{
 			"D0, P[], (doc)::[1, 3]\n",
 		},
 	},
-	{
-		skipDoc:    true,
-		document:   `a: [1,2,3]`,
-		expression: `del(.a[])`,
-		expected: []string{
-			"D0, P[], (doc)::a: []\n",
-		},
-	},
-	{
-		skipDoc:    true,
-		document:   `a: [10,x,10, 10, x, 10]`,
-		expression: `del(.a[] | select(. == 10))`,
-		expected: []string{
-			"D0, P[], (doc)::a: [x, x]\n",
-		},
-	},
-	{
-		skipDoc:    true,
-		document:   `a: {thing1: yep, thing2: cool, thing3: hi, b: {thing1: cool, great: huh}}`,
-		expression: `del(..)`,
-		expected: []string{
-			"D0, P[], (!!map)::{}\n",
-		},
-	},
-	{
-		skipDoc:    true,
-		document:   `a: {thing1: yep, thing2: cool, thing3: hi, b: {thing1: cool, great: huh}}`,
-		expression: `del(.. | select(tag == "!!map") | (.b.thing1,.thing2))`,
-		expected: []string{
-			"D0, P[], (!!map)::a: {thing1: yep, thing3: hi, b: {great: huh}}\n",
-		},
-	},
 	{
 		description: "Delete nested entry in array",
 		document:    `[{a: cat, b: dog}]`,
@ -157,14 +61,6 @@ var deleteOperatorScenarios = []expressionScenario{
 			"D0, P[], (doc)::{b: dog}\n",
 		},
 	},
-	{
-		description: "Recursively delete matching keys",
-		document:    `{a: {name: frog, b: {name: blog, age: 12}}}`,
-		expression:  `del(.. | select(has("name")).name)`,
-		expected: []string{
-			"D0, P[], (!!map)::{a: {b: {age: 12}}}\n",
-		},
-	},
 }

 func TestDeleteOperatorScenarios(t *testing.T) {
--- a/pkg/yqlib/operator_document_index.go
+++ b/pkg/yqlib/operator_document_index.go
@ -7,14 +7,14 @@ import (
 	"gopkg.in/yaml.v3"
 )

-func getDocumentIndexOperator(d *dataTreeNavigator, context Context, expressionNode *ExpressionNode) (Context, error) {
+func GetDocumentIndexOperator(d *dataTreeNavigator, matchingNodes *list.List, pathNode *PathTreeNode) (*list.List, error) {
 	var results = list.New()

-	for el := context.MatchingNodes.Front(); el != nil; el = el.Next() {
+	for el := matchingNodes.Front(); el != nil; el = el.Next() {
 		candidate := el.Value.(*CandidateNode)
 		node := &yaml.Node{Kind: yaml.ScalarNode, Value: fmt.Sprintf("%v", candidate.Document), Tag: "!!int"}
-		scalar := candidate.CreateChild(nil, node)
+		scalar := &CandidateNode{Node: node, Document: candidate.Document, Path: candidate.Path}
 		results.PushBack(scalar)
 	}
-	return context.ChildContext(results), nil
+	return results, nil
 }
--- a/pkg/yqlib/operator_document_index_test.go
+++ b/pkg/yqlib/operator_document_index_test.go
@ -14,15 +14,6 @@ var documentIndexScenarios = []expressionScenario{
 			"D1, P[a], (!!int)::1\n",
 		},
 	},
-	{
-		description: "Retrieve a document index, shorthand",
-		document:    "a: cat\n---\na: frog\n",
-		expression:  `.a | di`,
-		expected: []string{
-			"D0, P[a], (!!int)::0\n",
-			"D1, P[a], (!!int)::1\n",
-		},
-	},
 	{
 		description: "Filter by document index",
 		document:    "a: cat\n---\na: frog\n",
@ -31,14 +22,6 @@ var documentIndexScenarios = []expressionScenario{
 			"D1, P[], (doc)::a: frog\n",
 		},
 	},
-	{
-		description: "Filter by document index shorthand",
-		document:    "a: cat\n---\na: frog\n",
-		expression:  `select(di == 1)`,
-		expected: []string{
-			"D1, P[], (doc)::a: frog\n",
-		},
-	},
 	{
 		description: "Print Document Index with matches",
 		document:    "a: cat\n---\na: frog\n",
--- a/pkg/yqlib/operator_entries.go
+++ b/pkg/yqlib/operator_entries.go
@ -1,162 +0,0 @@
-package yqlib
-
-import (
-	"container/list"
-	"fmt"
-
-	yaml "gopkg.in/yaml.v3"
-)
-
-func entrySeqFor(key *yaml.Node, value *yaml.Node) *yaml.Node {
-	var keyKey = &yaml.Node{Kind: yaml.ScalarNode, Tag: "!!str", Value: "key"}
-	var valueKey = &yaml.Node{Kind: yaml.ScalarNode, Tag: "!!str", Value: "value"}
-
-	return &yaml.Node{
-		Kind:    yaml.MappingNode,
-		Tag:     "!!map",
-		Content: []*yaml.Node{keyKey, key, valueKey, value},
-	}
-}
-
-func toEntriesFromMap(candidateNode *CandidateNode) *CandidateNode {
-	var sequence = &yaml.Node{Kind: yaml.SequenceNode, Tag: "!!seq"}
-	var entriesNode = candidateNode.CreateChild(nil, sequence)
-
-	var contents = unwrapDoc(candidateNode.Node).Content
-	for index := 0; index < len(contents); index = index + 2 {
-		key := contents[index]
-		value := contents[index+1]
-
-		sequence.Content = append(sequence.Content, entrySeqFor(key, value))
-	}
-	return entriesNode
-}
-
-func toEntriesfromSeq(candidateNode *CandidateNode) *CandidateNode {
-	var sequence = &yaml.Node{Kind: yaml.SequenceNode, Tag: "!!seq"}
-	var entriesNode = candidateNode.CreateChild(nil, sequence)
-
-	var contents = unwrapDoc(candidateNode.Node).Content
-	for index := 0; index < len(contents); index = index + 1 {
-		key := &yaml.Node{Kind: yaml.ScalarNode, Tag: "!!int", Value: fmt.Sprintf("%v", index)}
-		value := contents[index]
-
-		sequence.Content = append(sequence.Content, entrySeqFor(key, value))
-	}
-	return entriesNode
-}
-
-func toEntriesOperator(d *dataTreeNavigator, context Context, expressionNode *ExpressionNode) (Context, error) {
-	var results = list.New()
-	for el := context.MatchingNodes.Front(); el != nil; el = el.Next() {
-		candidate := el.Value.(*CandidateNode)
-		candidateNode := unwrapDoc(candidate.Node)
-
-		switch candidateNode.Kind {
-		case yaml.MappingNode:
-			results.PushBack(toEntriesFromMap(candidate))
-
-		case yaml.SequenceNode:
-			results.PushBack(toEntriesfromSeq(candidate))
-		default:
-			if candidateNode.Tag != "!!null" {
-				return Context{}, fmt.Errorf("%v has no keys", candidate.Node.Tag)
-			}
-		}
-	}
-
-	return context.ChildContext(results), nil
-}
-
-func parseEntry(d *dataTreeNavigator, entry *yaml.Node, position int) (*yaml.Node, *yaml.Node, error) {
-	prefs := traversePreferences{DontAutoCreate: true}
-	candidateNode := &CandidateNode{Node: entry}
-
-	keyResults, err := traverseMap(Context{}, candidateNode, "key", prefs, false)
-
-	if err != nil {
-		return nil, nil, err
-	} else if keyResults.Len() != 1 {
-		return nil, nil, fmt.Errorf("Expected to find one 'key' entry but found %v in position %v", keyResults.Len(), position)
-	}
-
-	valueResults, err := traverseMap(Context{}, candidateNode, "value", prefs, false)
-
-	if err != nil {
-		return nil, nil, err
-	} else if valueResults.Len() != 1 {
-		return nil, nil, fmt.Errorf("Expected to find one 'value' entry but found %v in position %v", valueResults.Len(), position)
-	}
-
-	return keyResults.Front().Value.(*CandidateNode).Node, valueResults.Front().Value.(*CandidateNode).Node, nil
-
-}
-
-func fromEntries(d *dataTreeNavigator, candidateNode *CandidateNode) (*CandidateNode, error) {
-	var node = &yaml.Node{Kind: yaml.MappingNode, Tag: "!!map"}
-	var mapCandidateNode = candidateNode.CreateChild(nil, node)
-
-	var contents = unwrapDoc(candidateNode.Node).Content
-
-	for index := 0; index < len(contents); index = index + 1 {
-		key, value, err := parseEntry(d, contents[index], index)
-		if err != nil {
-			return nil, err
-		}
-
-		node.Content = append(node.Content, key, value)
-	}
-	return mapCandidateNode, nil
-}
-
-func fromEntriesOperator(d *dataTreeNavigator, context Context, expressionNode *ExpressionNode) (Context, error) {
-	var results = list.New()
-	for el := context.MatchingNodes.Front(); el != nil; el = el.Next() {
-		candidate := el.Value.(*CandidateNode)
-		candidateNode := unwrapDoc(candidate.Node)
-
-		switch candidateNode.Kind {
-		case yaml.SequenceNode:
-			mapResult, err := fromEntries(d, candidate)
-			if err != nil {
-				return Context{}, err
-			}
-			results.PushBack(mapResult)
-		default:
-			return Context{}, fmt.Errorf("from entries only runs against arrays")
-		}
-	}
-
-	return context.ChildContext(results), nil
-}
-
-func withEntriesOperator(d *dataTreeNavigator, context Context, expressionNode *ExpressionNode) (Context, error) {
-
-	//to_entries on the context
-	toEntries, err := toEntriesOperator(d, context, expressionNode)
-	if err != nil {
-		return Context{}, err
-	}
-
-	//run expression against entries
-	// splat toEntries and pipe it into Rhs
-	splatted, err := splat(d, toEntries, traversePreferences{})
-	if err != nil {
-		return Context{}, err
-	}
-
-	result, err := d.GetMatchingNodes(splatted, expressionNode.Rhs)
-	log.Debug("expressionNode.Rhs %v", expressionNode.Rhs.Operation.OperationType)
-	log.Debug("result %v", result)
-	if err != nil {
-		return Context{}, err
-	}
-
-	collected, err := collectOperator(d, result, expressionNode)
-	if err != nil {
-		return Context{}, err
-	}
-
-	//from_entries on the result
-	return fromEntriesOperator(d, collected, expressionNode)
-}
--- a/pkg/yqlib/operator_entries_test.go
+++ b/pkg/yqlib/operator_entries_test.go
@ -1,62 +0,0 @@
-package yqlib
-
-import (
-	"testing"
-)
-
-var entriesOperatorScenarios = []expressionScenario{
-	{
-		description: "to_entries Map",
-		document:    `{a: 1, b: 2}`,
-		expression:  `to_entries`,
-		expected: []string{
-			"D0, P[], (!!seq)::- key: a\n  value: 1\n- key: b\n  value: 2\n",
-		},
-	},
-	{
-		description: "to_entries Array",
-		document:    `[a, b]`,
-		expression:  `to_entries`,
-		expected: []string{
-			"D0, P[], (!!seq)::- key: 0\n  value: a\n- key: 1\n  value: b\n",
-		},
-	},
-	{
-		description: "to_entries null",
-		document:    `null`,
-		expression:  `to_entries`,
-		expected:    []string{},
-	},
-	{
-		description: "from_entries map",
-		document:    `{a: 1, b: 2}`,
-		expression:  `to_entries | from_entries`,
-		expected: []string{
-			"D0, P[], (!!map)::a: 1\nb: 2\n",
-		},
-	},
-	{
-		description:    "from_entries with numeric key indexes",
-		subdescription: "from_entries always creates a map, even for numeric keys",
-		document:       `[a,b]`,
-		expression:     `to_entries | from_entries`,
-		expected: []string{
-			"D0, P[], (!!map)::0: a\n1: b\n",
-		},
-	},
-	{
-		description: "Use with_entries to update keys",
-		document:    `{a: 1, b: 2}`,
-		expression:  `with_entries(.key |= "KEY_" + .)`,
-		expected: []string{
-			"D0, P[], (!!map)::KEY_a: 1\nKEY_b: 2\n",
-		},
-	},
-}
-
-func TestEntriesOperatorScenarios(t *testing.T) {
-	for _, tt := range entriesOperatorScenarios {
-		testScenario(t, &tt)
-	}
-	documentScenarios(t, "Entries", entriesOperatorScenarios)
-}
--- a/pkg/yqlib/operator_env.go
+++ b/pkg/yqlib/operator_env.go
@ -1,49 +0,0 @@
-package yqlib
-
-import (
-	"fmt"
-	"os"
-	"strings"
-
-	yaml "gopkg.in/yaml.v3"
-)
-
-type envOpPreferences struct {
-	StringValue bool
-}
-
-func envOperator(d *dataTreeNavigator, context Context, expressionNode *ExpressionNode) (Context, error) {
-	envName := expressionNode.Operation.CandidateNode.Node.Value
-	log.Debug("EnvOperator, env name:", envName)
-
-	rawValue := os.Getenv(envName)
-
-	preferences := expressionNode.Operation.Preferences.(envOpPreferences)
-
-	var node *yaml.Node
-	if preferences.StringValue {
-		node = &yaml.Node{
-			Kind:  yaml.ScalarNode,
-			Tag:   "!!str",
-			Value: rawValue,
-		}
-	} else if rawValue == "" {
-		return Context{}, fmt.Errorf("Value for env variable '%v' not provided in env()", envName)
-	} else {
-		var dataBucket yaml.Node
-		decoder := yaml.NewDecoder(strings.NewReader(rawValue))
-		errorReading := decoder.Decode(&dataBucket)
-		if errorReading != nil {
-			return Context{}, errorReading
-		}
-		//first node is a doc
-		node = unwrapDoc(&dataBucket)
-	}
-	log.Debug("ENV tag", node.Tag)
-	log.Debug("ENV value", node.Value)
-	log.Debug("ENV Kind", node.Kind)
-
-	target := &CandidateNode{Node: node}
-
-	return context.SingleChildContext(target), nil
-}
--- a/pkg/yqlib/operator_env_test.go
+++ b/pkg/yqlib/operator_env_test.go
@ -1,72 +0,0 @@
-package yqlib
-
-import (
-	"testing"
-)
-
-var envOperatorScenarios = []expressionScenario{
-	{
-		description:         "Read string environment variable",
-		environmentVariable: "cat meow",
-		expression:          `.a = env(myenv)`,
-		expected: []string{
-			"D0, P[], ()::a: cat meow\n",
-		},
-	},
-	{
-		description:         "Read boolean environment variable",
-		environmentVariable: "true",
-		expression:          `.a = env(myenv)`,
-		expected: []string{
-			"D0, P[], ()::a: true\n",
-		},
-	},
-	{
-		description:         "Read numeric environment variable",
-		environmentVariable: "12",
-		expression:          `.a = env(myenv)`,
-		expected: []string{
-			"D0, P[], ()::a: 12\n",
-		},
-	},
-	{
-		description:         "Read yaml environment variable",
-		environmentVariable: "{b: fish}",
-		expression:          `.a = env(myenv)`,
-		expected: []string{
-			"D0, P[], ()::a: {b: fish}\n",
-		},
-	},
-	{
-		description:         "Read boolean environment variable as a string",
-		environmentVariable: "true",
-		expression:          `.a = strenv(myenv)`,
-		expected: []string{
-			"D0, P[], ()::a: \"true\"\n",
-		},
-	},
-	{
-		description:         "Read numeric environment variable as a string",
-		environmentVariable: "12",
-		expression:          `.a = strenv(myenv)`,
-		expected: []string{
-			"D0, P[], ()::a: \"12\"\n",
-		},
-	},
-	{
-		description:         "Dynamic key lookup with environment variable",
-		environmentVariable: "cat",
-		document:            `{cat: meow, dog: woof}`,
-		expression:          `.[env(myenv)]`,
-		expected: []string{
-			"D0, P[cat], (!!str)::meow\n",
-		},
-	},
-}
-
-func TestEnvOperatorScenarios(t *testing.T) {
-	for _, tt := range envOperatorScenarios {
-		testScenario(t, &tt)
-	}
-	documentScenarios(t, "Env Variable Operators", envOperatorScenarios)
-}
--- a/pkg/yqlib/operator_equals.go
+++ b/pkg/yqlib/operator_equals.go
@ -1,54 +1,22 @@
 package yqlib

-import "gopkg.in/yaml.v3"
+import (
+	"container/list"
+)

-func equalsOperator(d *dataTreeNavigator, context Context, expressionNode *ExpressionNode) (Context, error) {
+func EqualsOperator(d *dataTreeNavigator, matchingNodes *list.List, pathNode *PathTreeNode) (*list.List, error) {
 	log.Debugf("-- equalsOperation")
-	return crossFunction(d, context.ReadOnlyClone(), expressionNode, isEquals(false), true)
+	return crossFunction(d, matchingNodes, pathNode, isEquals)
 }

-func isEquals(flip bool) func(d *dataTreeNavigator, context Context, lhs *CandidateNode, rhs *CandidateNode) (*CandidateNode, error) {
-	return func(d *dataTreeNavigator, context Context, lhs *CandidateNode, rhs *CandidateNode) (*CandidateNode, error) {
-		value := false
-		log.Debugf("-- isEquals cross function")
-		if lhs == nil && rhs == nil {
-			owner := &CandidateNode{}
-			return createBooleanCandidate(owner, !flip), nil
-		} else if lhs == nil {
-			log.Debugf("lhs nil, but rhs is not")
-			rhsNode := unwrapDoc(rhs.Node)
-			value := rhsNode.Tag == "!!null"
-			if flip {
-				value = !value
-			}
-			return createBooleanCandidate(rhs, value), nil
-		} else if rhs == nil {
-			log.Debugf("lhs not nil, but rhs is")
-			lhsNode := unwrapDoc(lhs.Node)
-			value := lhsNode.Tag == "!!null"
-			if flip {
-				value = !value
-			}
-			return createBooleanCandidate(lhs, value), nil
-		}
+func isEquals(d *dataTreeNavigator, lhs *CandidateNode, rhs *CandidateNode) (*CandidateNode, error) {
+	value := false

-		lhsNode := unwrapDoc(lhs.Node)
-		rhsNode := unwrapDoc(rhs.Node)
-
-		if lhsNode.Tag == "!!null" {
-			value = (rhsNode.Tag == "!!null")
-		} else if lhsNode.Kind == yaml.ScalarNode && rhsNode.Kind == yaml.ScalarNode {
-			value = matchKey(lhsNode.Value, rhsNode.Value)
-		}
-		log.Debugf("%v == %v ? %v", NodeToString(lhs), NodeToString(rhs), value)
-		if flip {
-			value = !value
-		}
-		return createBooleanCandidate(lhs, value), nil
+	if lhs.Node.Tag == "!!null" {
+		value = (rhs.Node.Tag == "!!null")
+	} else {
+		value = Match(lhs.Node.Value, rhs.Node.Value)
 	}
-}
-
-func notEqualsOperator(d *dataTreeNavigator, context Context, expressionNode *ExpressionNode) (Context, error) {
-	log.Debugf("-- notEqualsOperator")
-	return crossFunction(d, context.ReadOnlyClone(), expressionNode, isEquals(true), true)
+	log.Debugf("%v == %v ? %v", NodeToString(lhs), NodeToString(rhs), value)
+	return createBooleanCandidate(lhs, value), nil
 }
--- a/pkg/yqlib/operator_equals_test.go
+++ b/pkg/yqlib/operator_equals_test.go
@ -5,84 +5,6 @@ import (
 )

 var equalsOperatorScenarios = []expressionScenario{
-	{
-		skipDoc:    true,
-		expression: ".a == .b",
-		expected: []string{
-			"D0, P[], (!!bool)::true\n",
-		},
-	},
-	{
-		skipDoc:    true,
-		document:   "cat",
-		document2:  "dog",
-		expression: "select(fi==0) == select(fi==1)",
-		expected: []string{
-			"D0, P[], (!!bool)::false\n",
-		},
-	},
-	{
-		skipDoc:    true,
-		document:   "{}",
-		expression: "(.a == .b) as $x",
-		expected: []string{
-			"D0, P[], (doc)::{}\n",
-		},
-	},
-	{
-		skipDoc:    true,
-		document:   "{}",
-		expression: ".a == .b",
-		expected: []string{
-			"D0, P[], (!!bool)::true\n",
-		},
-	},
-	{
-		skipDoc:    true,
-		document:   "{}",
-		expression: "(.a != .b) as $x",
-		expected: []string{
-			"D0, P[], (doc)::{}\n",
-		},
-	},
-	{
-		skipDoc:    true,
-		document:   "{}",
-		expression: ".a != .b",
-		expected: []string{
-			"D0, P[], (!!bool)::false\n",
-		},
-	},
-	{
-		skipDoc:    true,
-		document:   "{a: {b: 10}}",
-		expression: "select(.c != null)",
-		expected:   []string{},
-	},
-	{
-		skipDoc:    true,
-		document:   "{a: {b: 10}}",
-		expression: "select(.d == .c)",
-		expected: []string{
-			"D0, P[], (doc)::{a: {b: 10}}\n",
-		},
-	},
-	{
-		skipDoc:    true,
-		document:   "{a: {b: 10}}",
-		expression: "select(null == .c)",
-		expected: []string{
-			"D0, P[], (doc)::{a: {b: 10}}\n",
-		},
-	},
-	{
-		skipDoc:    true,
-		document:   "{a: { b: {things: \"\"}, f: [1], g: [] }}",
-		expression: ".. | select(. == \"\")",
-		expected: []string{
-			"D0, P[a b things], (!!str)::\"\"\n",
-		},
-	},
 	{
 		description: "Match string",
 		document:    `[cat,goat,dog]`,
@ -92,18 +14,7 @@ var equalsOperatorScenarios = []expressionScenario{
 			"D0, P[1], (!!bool)::true\n",
 			"D0, P[2], (!!bool)::false\n",
 		},
-	},
-	{
-		description: "Don't match string",
-		document:    `[cat,goat,dog]`,
-		expression:  `.[] | (. != "*at")`,
-		expected: []string{
-			"D0, P[0], (!!bool)::false\n",
-			"D0, P[1], (!!bool)::false\n",
-			"D0, P[2], (!!bool)::true\n",
-		},
-	},
-	{
+	}, {
 		description: "Match number",
 		document:    `[3, 4, 5]`,
 		expression:  `.[] | (. == 4)`,
@ -112,18 +23,7 @@ var equalsOperatorScenarios = []expressionScenario{
 			"D0, P[1], (!!bool)::true\n",
 			"D0, P[2], (!!bool)::false\n",
 		},
-	},
-	{
-		description: "Dont match number",
-		document:    `[3, 4, 5]`,
-		expression:  `.[] | (. != 4)`,
-		expected: []string{
-			"D0, P[0], (!!bool)::true\n",
-			"D0, P[1], (!!bool)::false\n",
-			"D0, P[2], (!!bool)::true\n",
-		},
-	},
-	{
+	}, {
 		skipDoc:    true,
 		document:   `a: { cat: {b: apple, c: whatever}, pat: {b: banana} }`,
 		expression: `.a | (.[].b == "apple")`,
@ -148,22 +48,6 @@ var equalsOperatorScenarios = []expressionScenario{
 			"D0, P[], (!!bool)::true\n",
 		},
 	},
-	{
-		description: "Non exisitant key doesn't equal a value",
-		document:    "a: frog",
-		expression:  `select(.b != "thing")`,
-		expected: []string{
-			"D0, P[], (doc)::a: frog\n",
-		},
-	},
-	{
-		description: "Two non existant keys are equal",
-		document:    "a: frog",
-		expression:  `select(.b == .c)`,
-		expected: []string{
-			"D0, P[], (doc)::a: frog\n",
-		},
-	},
 }

 func TestEqualOperatorScenarios(t *testing.T) {
--- a/Show More
+++ b/Show More
Author	SHA1	Message	Date
Mike Farah	dbd7ab0f13	Refactored doc generation, add fi fileIndex alias	2021-01-02 10:49:33 +11:00
Mike Farah	6d512ad718	Fixed updating yaml from other files	2021-01-02 10:27:32 +11:00
Mike Farah	4fef4a7ab1	update issue template, instruct questions to be raised in disussion	2020-12-31 13:43:44 +11:00
Mike Farah	dcb17b51a9	fixed heading	2020-12-31 09:33:15 +11:00
Mike Farah	385417556d	added tar.gz instructions	2020-12-31 09:30:59 +11:00
				`@ -1 +0,0 @@`
				Similar to the same named functions in `jq` these functions convert to/from an object and an array of key-value pairs. This is most useful for performing operations on keys of maps.
				`@ -1,2 +0,0 @@`
				This operator is used to handle environment variables usage in path expressions. While environment variables can, of course, be passed in via your CLI with string interpolation, this often comes with complex quote escaping and can be tricky to write and read. Note that there are two forms, `env` which will parse the environment variable as a yaml (be it a map, array, string, number of boolean) and `strenv` which will always parse the argument as a string.
				`@ -1 +0,0 @@`
				`This is used to filter out duplicated items in an array.`
				`@ -1 +0,0 @@`
				`For more complex scenarios, variables can be used to hold values of expression to be used in other expressions.`