Bumping version to beta2

README.md

@@ -25,16 +25,16 @@ snap install yq
 `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:
 
 ```
-sudo cat /etc/myfile | yq r - a.path
+sudo cat /etc/myfile | yq e '.a.path' - 
 ```
 
 And to write to a root file you can either use [sponge](https://linux.die.net/man/1/sponge):
 ```
-sudo cat /etc/myfile | yq w - a.path value | sudo sponge /etc/myfile
+sudo cat /etc/myfile | yq e '.a.path = "value"' - | sudo sponge /etc/myfile
 ```
 or write to a temporary file:
 ```
-sudo cat /etc/myfile | yq w - a.path value | sudo tee /etc/myfile.tmp
+sudo cat /etc/myfile | yq e '.a.path = "value"' | sudo tee /etc/myfile.tmp
 sudo mv /etc/myfile.tmp /etc/myfile
 rm /etc/myfile.tmp
 ```
@@ -48,7 +48,7 @@ wget https://github.com/mikefarah/yq/releases/download/{VERSION}/{BINARY} -O /us
     chmod +x /usr/bin/yq
 ```
 
-For instance, VERSION=3.4.0 and BINARY=yq_linux_amd64
+For instance, VERSION=4.0.0 and BINARY=yq_linux_amd64
 
 
 ### Run with Docker
@@ -56,7 +56,7 @@ For instance, VERSION=3.4.0 and BINARY=yq_linux_amd64
 #### Oneshot use:
 
 ```bash
-docker run --rm -v "${PWD}":/workdir mikefarah/yq yq [flags] <command> FILE...
+docker run --rm -v "${PWD}":/workdir mikefarah/yq <command> [flags] [expression ]FILE...
 ```
 
 #### Run commands interactively:
@@ -69,13 +69,13 @@ It can be useful to have a bash function to avoid typing the whole docker comman
 
 ```bash
 yq() {
-  docker run --rm -i -v "${PWD}":/workdir mikefarah/yq yq "$@"
+  docker run --rm -i -v "${PWD}":/workdir mikefarah/yq "$@"
 }
 ```
 
 ### Go Get:
 ```
-GO111MODULE=on go get github.com/mikefarah/yq/v3
+GO111MODULE=on go get github.com/mikefarah/yq/v4
 ```
 
 ## Community Supported Installation methods
@@ -108,9 +108,8 @@ Supported by @rmescandon (https://launchpad.net/~rmescandon/+archive/ubuntu/yq)
 
 ## Features
 - Written in portable go, so you can download a lovely dependency free binary
-- [Colorize the output](https://mikefarah.gitbook.io/yq/usage/output-format#colorize-output)
+- Colorized yaml output
-- [Deep read a yaml file with a given path expression](https://mikefarah.gitbook.io/yq/commands/read#basic)
+- [Deep read a yaml file with a given path expression](https://mikefarah.gitbook.io/yq/v/v4.x/traverse)
-- [List matching paths of a given path expression](https://mikefarah.gitbook.io/yq/commands/read#path-only)
 - [Return the lengths of arrays/object/scalars](https://mikefarah.gitbook.io/yq/commands/read#printing-length-of-the-results)
 - Update a yaml file given a [path expression](https://mikefarah.gitbook.io/yq/commands/write-update#basic) or [script file](https://mikefarah.gitbook.io/yq/commands/write-update#basic)
 - Update creates any missing entries in the path on the fly

cmd/evaluate_all_command.go

@@ -15,9 +15,8 @@ func createEvaluateAllCommand() *cobra.Command {
 		Aliases: []string{"ea"},
 		Short:   "Loads _all_ yaml documents of _all_ yaml files and runs expression once",
 		Example: `
-yq es '.a.b | length' file1.yml file2.yml
+# merges f2.yml into f1.yml (inplace)
-yq es < sample.yaml
+yq eval-all --inplace 'select(fileIndex == 0) * select(fileIndex == 1)' f1.yml f2.yml		
-yq es -n '{"a": "b"}'
 `,
 		Long: "Evaluate All:\nUseful when you need to run an expression across several yaml documents or files. Consumes more memory than eval",
 		RunE: evaluateAll,

cmd/evalute_sequence_command.go

@@ -15,9 +15,18 @@ func createEvaluateSequenceCommand() *cobra.Command {
 		Aliases: []string{"e"},
 		Short:   "Apply expression to each document in each yaml file given in sequence",
 		Example: `
-yq es '.a.b | length' file1.yml file2.yml
+# runs the expression against each file, in series
-yq es < sample.yaml
+yq e '.a.b | length' f1.yml f2.yml 
-yq es -n '{"a": "b"}'
+
+# prints out the file
+yq e sample.yaml 
+
+# prints a new yaml document
+yq e -n '.a.b.c = "cat"' 
+
+
+# updates file.yaml directly
+yq e '.a.b = "cool"' -i file.yaml 
 `,
 		Long: "Evaluate Sequence:\nIterate over each yaml document, apply the expression and print the results, in sequence.",
 		RunE: evaluateSequence,

cmd/version.go

@@ -11,7 +11,7 @@ var (
 	GitDescribe string
 
 	// Version is main version number that is being run at the moment.
-	Version = "4.0.0-beta1"
+	Version = "4.0.0-beta2"
 
 	// 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

go.mod

@@ -6,8 +6,7 @@ require (
 	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 v1.0.0
+	github.com/spf13/cobra v1.1.1
-	github.com/spf13/pflag v1.0.5 // indirect
 	github.com/timtadh/data-structures v0.5.3 // indirect
 	github.com/timtadh/lexmachine v0.2.2
 	golang.org/x/sys v0.0.0-20200930185726-fdedc70b468f // indirect

go.sum

@@ -1,16 +1,33 @@
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@@ -26,6 +43,7 @@ github.com/fatih/color v1.9.0 h1:8xPHl4/q1VyqGIPif1F+1V3Y3lSmrq01EabUW3CoW5s=
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@@ -39,20 +57,54 @@ github.com/gogo/protobuf v1.2.1/go.mod h1:hp+jE20tsWTFYpLwKvXlhS1hjn+gTNwPg2I6zV
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@@ -154,28 +267,63 @@ golang.org/x/sys v0.0.0-20200223170610-d5e6a3e2c0ae/go.mod h1:h1NjWce9XRLGQEsW7w
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 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=
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@@ -183,6 +331,13 @@ gopkg.in/yaml.v2 v2.0.0-20170812160011-eb3733d160e7/go.mod h1:JAlM8MvJe8wmxCU4Bl
 gopkg.in/yaml.v2 v2.2.1/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
 gopkg.in/yaml.v2 v2.2.2 h1:ZCJp+EgiOT7lHqUV2J862kp8Qj64Jo6az82+3Td9dZw=
 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 v2.2.8 h1:obN1ZagJSUGI0Ek/LBmuj4SNLPfIny3KsKFopxRdj10=
+gopkg.in/yaml.v2 v2.2.8/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
 gopkg.in/yaml.v3 v3.0.0-20200615113413-eeeca48fe776 h1:tQIYjPdBoyREyB9XMu+nnTclpTYkz2zFM+lzLJFO4gQ=
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pkg/yqlib/doc/Assign.md

@@ -8,7 +8,7 @@ This will do a similar thing to the plain form, however, the RHS expression is r
 ## Create yaml file
 Running
 ```bash
-yq eval --null-input '(.a.b = "cat") | (.x = "frog")'
+yq eval --null-input '.a.b = "cat" | .x = "frog"'
 ```
 will output
 ```yaml
@@ -112,7 +112,7 @@ a:
 ```
 then
 ```bash
-yq eval '.a.[] | select(. == "apple") |= "frog"' sample.yml
+yq eval '(.a.[] | select(. == "apple")) = "frog"' sample.yml
 ```
 will output
 ```yaml
@@ -130,7 +130,7 @@ Given a sample.yml file of:
 ```
 then
 ```bash
-yq eval '.[] | select(. == "*andy") |= "bogs"' sample.yml
+yq eval '(.[] | select(. == "*andy")) = "bogs"' sample.yml
 ```
 will output
 ```yaml

pkg/yqlib/doc/Length.md

@@ -0,0 +1,54 @@
+Returns the lengths of the nodes. Length is defined according to the type of the node.
+
+## String length
+returns length of string
+
+Given a sample.yml file of:
+```yaml
+a: cat
+```
+then
+```bash
+yq eval '.a | length' sample.yml
+```
+will output
+```yaml
+3
+```
+
+## Map length
+returns number of entries
+
+Given a sample.yml file of:
+```yaml
+a: cat
+c: dog
+```
+then
+```bash
+yq eval 'length' sample.yml
+```
+will output
+```yaml
+2
+```
+
+## Array length
+returns number of elements
+
+Given a sample.yml file of:
+```yaml
+- 2
+- 4
+- 6
+- 8
+```
+then
+```bash
+yq eval 'length' sample.yml
+```
+will output
+```yaml
+4
+```
+

pkg/yqlib/doc/Pipe.md

@@ -0,0 +1,35 @@
+Pipe the results of an expression into another. Like the bash operator.
+
+## Simple Pipe
+Given a sample.yml file of:
+```yaml
+a:
+  b: cat
+```
+then
+```bash
+yq eval '.a | .b' sample.yml
+```
+will output
+```yaml
+cat
+```
+
+## Multiple updates
+Given a sample.yml file of:
+```yaml
+a: cow
+b: sheep
+c: same
+```
+then
+```bash
+yq eval '.a = "cat" | .b = "dog"' sample.yml
+```
+will output
+```yaml
+a: cat
+b: dog
+c: same
+```
+

pkg/yqlib/doc/headers/Length.md

@@ -0,0 +1 @@
+Returns the lengths of the nodes. Length is defined according to the type of the node.

pkg/yqlib/doc/headers/Pipe.md

@@ -0,0 +1 @@
+Pipe the results of an expression into another. Like the bash operator.

pkg/yqlib/lib.go

@@ -21,14 +21,14 @@ type OperationType struct {
 // operators TODO:
 // - cookbook doc for common things
 // - mergeEmpty (sets only if the document is empty, do I do that now?)
-// - compare ??
-// - validate ??
 
 var Or = &OperationType{Type: "OR", NumArgs: 2, Precedence: 20, Handler: OrOperator}
 var And = &OperationType{Type: "AND", NumArgs: 2, Precedence: 20, Handler: AndOperator}
 
 var Union = &OperationType{Type: "UNION", NumArgs: 2, Precedence: 10, Handler: UnionOperator}
 
+var Pipe = &OperationType{Type: "PIPE", NumArgs: 2, Precedence: 30, Handler: PipeOperator}
+
 var Assign = &OperationType{Type: "ASSIGN", NumArgs: 2, Precedence: 40, Handler: AssignUpdateOperator}
 var AddAssign = &OperationType{Type: "ADD_ASSIGN", NumArgs: 2, Precedence: 40, Handler: AddAssignOperator}
 
@@ -42,7 +42,8 @@ var Add = &OperationType{Type: "ADD", NumArgs: 2, Precedence: 45, Handler: AddOp
 
 var Equals = &OperationType{Type: "EQUALS", NumArgs: 2, Precedence: 40, Handler: EqualsOperator}
 var CreateMap = &OperationType{Type: "CREATE_MAP", NumArgs: 2, Precedence: 40, Handler: CreateMapOperator}
-var Pipe = &OperationType{Type: "PIPE", NumArgs: 2, Precedence: 45, Handler: PipeOperator}
+
+var ShortPipe = &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}

pkg/yqlib/operator_assign_test.go

@@ -7,7 +7,7 @@ import (
 var assignOperatorScenarios = []expressionScenario{
 	{
 		description: "Create yaml file",
-		expression:  `(.a.b = "cat") | (.x = "frog")`,
+		expression:  `.a.b = "cat" | .x = "frog"`,
 		expected: []string{
 			"D0, P[], ()::a:\n    b: cat\nx: frog\n",
 		},
@@ -80,7 +80,7 @@ var assignOperatorScenarios = []expressionScenario{
 	{
 		description: "Update selected results",
 		document:    `{a: {b: apple, c: cactus}}`,
-		expression:  `.a.[] | select(. == "apple") |= "frog"`,
+		expression:  `(.a.[] | select(. == "apple")) = "frog"`,
 		expected: []string{
 			"D0, P[], (doc)::{a: {b: frog, c: cactus}}\n",
 		},
@@ -88,7 +88,7 @@ var assignOperatorScenarios = []expressionScenario{
 	{
 		description: "Update array values",
 		document:    `[candy, apple, sandy]`,
-		expression:  `.[] | select(. == "*andy") |= "bogs"`,
+		expression:  `(.[] | select(. == "*andy")) = "bogs"`,
 		expected: []string{
 			"D0, P[], (doc)::[bogs, apple, bogs]\n",
 		},

pkg/yqlib/operator_length.go

@@ -0,0 +1,35 @@
+package yqlib
+
+import (
+	"container/list"
+	"fmt"
+
+	yaml "gopkg.in/yaml.v3"
+)
+
+func LengthOperator(d *dataTreeNavigator, matchMap *list.List, pathNode *PathTreeNode) (*list.List, error) {
+	log.Debugf("-- lengthOperation")
+	var results = list.New()
+
+	for el := matchMap.Front(); el != nil; el = el.Next() {
+		candidate := el.Value.(*CandidateNode)
+		targetNode := UnwrapDoc(candidate.Node)
+		var length int
+		switch targetNode.Kind {
+		case yaml.ScalarNode:
+			length = len(targetNode.Value)
+		case yaml.MappingNode:
+			length = len(targetNode.Content) / 2
+		case yaml.SequenceNode:
+			length = len(targetNode.Content)
+		default:
+			length = 0
+		}
+
+		node := &yaml.Node{Kind: yaml.ScalarNode, Value: fmt.Sprintf("%v", length), Tag: "!!int"}
+		lengthCand := &CandidateNode{Node: node, Document: candidate.Document, Path: candidate.Path}
+		results.PushBack(lengthCand)
+	}
+
+	return results, nil
+}

pkg/yqlib/operator_length_test.go

@@ -0,0 +1,42 @@
+package yqlib
+
+import (
+	"testing"
+)
+
+var lengthOperatorScenarios = []expressionScenario{
+	{
+		description:    "String length",
+		subdescription: "returns length of string",
+		document:       `{a: cat}`,
+		expression:     `.a | length`,
+		expected: []string{
+			"D0, P[a], (!!int)::3\n",
+		},
+	},
+	{
+		description:    "Map length",
+		subdescription: "returns number of entries",
+		document:       `{a: cat, c: dog}`,
+		expression:     `length`,
+		expected: []string{
+			"D0, P[], (!!int)::2\n",
+		},
+	},
+	{
+		description:    "Array length",
+		subdescription: "returns number of elements",
+		document:       `[2,4,6,8]`,
+		expression:     `length`,
+		expected: []string{
+			"D0, P[], (!!int)::4\n",
+		},
+	},
+}
+
+func TestLengthOperatorScenarios(t *testing.T) {
+	for _, tt := range lengthOperatorScenarios {
+		testScenario(t, &tt)
+	}
+	documentScenarios(t, "Length", lengthOperatorScenarios)
+}

pkg/yqlib/operator_multiply.go

@@ -111,7 +111,7 @@ func createTraversalTree(path []interface{}) *PathTreeNode {
 		return &PathTreeNode{Operation: &Operation{OperationType: TraversePath, Value: path[0], StringValue: fmt.Sprintf("%v", path[0])}}
 	}
 	return &PathTreeNode{
-		Operation: &Operation{OperationType: Pipe},
+		Operation: &Operation{OperationType: ShortPipe},
 		Lhs:       createTraversalTree(path[0:1]),
 		Rhs:       createTraversalTree(path[1:])}
 

pkg/yqlib/operator_pipe.go

@@ -0,0 +1,11 @@
+package yqlib
+
+import "container/list"
+
+func PipeOperator(d *dataTreeNavigator, matchingNodes *list.List, pathNode *PathTreeNode) (*list.List, error) {
+	lhs, err := d.GetMatchingNodes(matchingNodes, pathNode.Lhs)
+	if err != nil {
+		return nil, err
+	}
+	return d.GetMatchingNodes(lhs, pathNode.Rhs)
+}

pkg/yqlib/operator_pipe_test.go

@@ -0,0 +1,31 @@
+package yqlib
+
+import (
+	"testing"
+)
+
+var pipeOperatorScenarios = []expressionScenario{
+	{
+		description: "Simple Pipe",
+		document:    `{a: {b: cat}}`,
+		expression:  `.a | .b`,
+		expected: []string{
+			"D0, P[a b], (!!str)::cat\n",
+		},
+	},
+	{
+		description: "Multiple updates",
+		document:    `{a: cow, b: sheep, c: same}`,
+		expression:  `.a = "cat" | .b = "dog"`,
+		expected: []string{
+			"D0, P[], (doc)::{a: cat, b: dog, c: same}\n",
+		},
+	},
+}
+
+func TestPipeOperatorScenarios(t *testing.T) {
+	for _, tt := range pipeOperatorScenarios {
+		testScenario(t, &tt)
+	}
+	documentScenarios(t, "Pipe", pipeOperatorScenarios)
+}

pkg/yqlib/operators.go

@@ -2,7 +2,6 @@ package yqlib
 
 import (
 	"container/list"
-	"fmt"
 
 	"gopkg.in/yaml.v3"
 )
@@ -20,14 +19,6 @@ func EmptyOperator(d *dataTreeNavigator, matchingNodes *list.List, pathNode *Pat
 	return list.New(), nil
 }
 
-func PipeOperator(d *dataTreeNavigator, matchingNodes *list.List, pathNode *PathTreeNode) (*list.List, error) {
-	lhs, err := d.GetMatchingNodes(matchingNodes, pathNode.Lhs)
-	if err != nil {
-		return nil, err
-	}
-	return d.GetMatchingNodes(lhs, pathNode.Rhs)
-}
-
 func createBooleanCandidate(owner *CandidateNode, value bool) *CandidateNode {
 	valString := "true"
 	if !value {
@@ -42,29 +33,3 @@ func nodeToMap(candidate *CandidateNode) *list.List {
 	elMap.PushBack(candidate)
 	return elMap
 }
-
-func LengthOperator(d *dataTreeNavigator, matchMap *list.List, pathNode *PathTreeNode) (*list.List, error) {
-	log.Debugf("-- lengthOperation")
-	var results = list.New()
-
-	for el := matchMap.Front(); el != nil; el = el.Next() {
-		candidate := el.Value.(*CandidateNode)
-		var length int
-		switch candidate.Node.Kind {
-		case yaml.ScalarNode:
-			length = len(candidate.Node.Value)
-		case yaml.MappingNode:
-			length = len(candidate.Node.Content) / 2
-		case yaml.SequenceNode:
-			length = len(candidate.Node.Content)
-		default:
-			length = 0
-		}
-
-		node := &yaml.Node{Kind: yaml.ScalarNode, Value: fmt.Sprintf("%v", length), Tag: "!!int"}
-		lengthCand := &CandidateNode{Node: node, Document: candidate.Document, Path: candidate.Path}
-		results.PushBack(lengthCand)
-	}
-
-	return results, nil
-}

pkg/yqlib/path_parse_test.go

@@ -11,58 +11,46 @@ var pathTests = []struct {
 	path            string
 	expectedTokens  []interface{}
 	expectedPostFix []interface{}
-}{ // TODO: Ensure ALL documented examples have tests! sheesh
+}{
-	// {"len(.)", append(make([]interface{}, 0), "LENGTH", "(", "SELF", ")")},
-	// {"\"len\"(.)", append(make([]interface{}, 0), "len", "TRAVERSE", "(", "SELF", ")")},
-	// {".a OR (.b OR .c)", append(make([]interface{}, 0), "a", "OR", "(", "b", "OR", "c", ")")},
-	// {"a OR (b OR c)", append(make([]interface{}, 0), "a", "OR", "(", "b", "OR", "c", ")")},
-	// {"a .- (b OR c)", append(make([]interface{}, 0), "a", " .- ", "(", "b", "OR", "c", ")")},
-	// {"(animal==3)", append(make([]interface{}, 0), "(", "animal", "==", int64(3), ")")},
-	// {"(animal==f3)", append(make([]interface{}, 0), "(", "animal", "==", "f3", ")")},
-	// {"apples.BANANAS", append(make([]interface{}, 0), "apples", "TRAVERSE", "BANANAS")},
-	// {"appl*.BANA*", append(make([]interface{}, 0), "appl*", "TRAVERSE", "BANA*")},
-	// {"a.b.**", append(make([]interface{}, 0), "a", "TRAVERSE", "b", "TRAVERSE", "**")},
-	// {"a.\"=\".frog", append(make([]interface{}, 0), "a", "TRAVERSE", "=", "TRAVERSE", "frog")},
-	// {"a.b.*", append(make([]interface{}, 0), "a", "TRAVERSE", "b", "TRAVERSE", "*")},
-	// {"a.b.thin*", append(make([]interface{}, 0), "a", "TRAVERSE", "b", "TRAVERSE", "thin*")},
-	// {".a.b.[0]", append(make([]interface{}, 0), "a", "TRAVERSE", "b", "TRAVERSE", int64(0))},
-	// {".a.b.[]", append(make([]interface{}, 0), "a", "TRAVERSE", "b", "TRAVERSE", "[]")},
-	// {".a.b.[+]", append(make([]interface{}, 0), "a", "TRAVERSE", "b", "TRAVERSE", "[+]")},
-	// {".a.b.[-12]", append(make([]interface{}, 0), "a", "TRAVERSE", "b", "TRAVERSE", int64(-12))},
-	// {".a.b.0", append(make([]interface{}, 0), "a", "TRAVERSE", "b", "TRAVERSE", "0")},
-	// {".a", append(make([]interface{}, 0), "a")},
-	// {".\"a.b\".c", append(make([]interface{}, 0), "a.b", "TRAVERSE", "c")},
-	// {`.b."foo.bar"`, append(make([]interface{}, 0), "b", "TRAVERSE", "foo.bar")},
-	// {`f | . == *og | length`, append(make([]interface{}, 0), "f", "TRAVERSE", "SELF", "EQUALS", "*og", "TRAVERSE", "LENGTH")},
-	// {`.a, .b`, append(make([]interface{}, 0), "a", "OR", "b")},
-	// {`[.a, .b]`, append(make([]interface{}, 0), "[", "a", "OR", "b", "]")},
-	// {`."[a", ."b]"`, append(make([]interface{}, 0), "[a", "OR", "b]")},
-	// {`.a.[]`, append(make([]interface{}, 0), "a", "PIPE", "[]")},
-	// {`.[].a`, append(make([]interface{}, 0), "[]", "PIPE", "a")},
-	// {
-	// 	`["cat"]`,
-	// 	append(make([]interface{}, 0), "[", "cat (string)", "]"),
-	// 	append(make([]interface{}, 0), "cat (string)", "COLLECT", "PIPE"),
-	// },
 	{
 		`[]`,
 		append(make([]interface{}, 0), "[", "]"),
-		append(make([]interface{}, 0), "EMPTY", "COLLECT", "PIPE"),
+		append(make([]interface{}, 0), "EMPTY", "COLLECT", "SHORT_PIPE"),
+	},
+	{
+		`.a[]`,
+		append(make([]interface{}, 0), "a", "SHORT_PIPE", "[]"),
+		append(make([]interface{}, 0), "a", "[]", "SHORT_PIPE"),
+	},
+	{
+		`.a.[]`,
+		append(make([]interface{}, 0), "a", "SHORT_PIPE", "[]"),
+		append(make([]interface{}, 0), "a", "[]", "SHORT_PIPE"),
+	},
+	{
+		`.a[].c`,
+		append(make([]interface{}, 0), "a", "SHORT_PIPE", "[]", "SHORT_PIPE", "c"),
+		append(make([]interface{}, 0), "a", "[]", "SHORT_PIPE", "c", "SHORT_PIPE"),
 	},
 	{
 		`[3]`,
 		append(make([]interface{}, 0), "[", "3 (int64)", "]"),
-		append(make([]interface{}, 0), "3 (int64)", "COLLECT", "PIPE"),
+		append(make([]interface{}, 0), "3 (int64)", "COLLECT", "SHORT_PIPE"),
 	},
 	{
 		`d0.a`,
-		append(make([]interface{}, 0), "d0", "PIPE", "a"),
+		append(make([]interface{}, 0), "d0", "SHORT_PIPE", "a"),
-		append(make([]interface{}, 0), "d0", "a", "PIPE"),
+		append(make([]interface{}, 0), "d0", "a", "SHORT_PIPE"),
 	},
 	{
-		`.a | (.[].b == "apple")`,
+		`.a | .[].b == "apple"`,
-		append(make([]interface{}, 0), "a", "PIPE", "(", "[]", "PIPE", "b", "EQUALS", "apple (string)", ")"),
+		append(make([]interface{}, 0), "a", "PIPE", "[]", "SHORT_PIPE", "b", "EQUALS", "apple (string)"),
-		append(make([]interface{}, 0), "a", "[]", "b", "PIPE", "apple (string)", "EQUALS", "PIPE"),
+		append(make([]interface{}, 0), "a", "[]", "b", "SHORT_PIPE", "apple (string)", "EQUALS", "PIPE"),
+	},
+	{
+		`(.a | .[].b) == "apple"`,
+		append(make([]interface{}, 0), "(", "a", "PIPE", "[]", "SHORT_PIPE", "b", ")", "EQUALS", "apple (string)"),
+		append(make([]interface{}, 0), "a", "[]", "b", "SHORT_PIPE", "PIPE", "apple (string)", "EQUALS"),
 	},
 	{
 		`.[] | select(. == "*at")`,
@@ -72,12 +60,12 @@ var pathTests = []struct {
 	{
 		`[true]`,
 		append(make([]interface{}, 0), "[", "true (bool)", "]"),
-		append(make([]interface{}, 0), "true (bool)", "COLLECT", "PIPE"),
+		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", "PIPE"),
+		append(make([]interface{}, 0), "true (bool)", "false (bool)", "UNION", "COLLECT", "SHORT_PIPE"),
 	},
 	{
 		`"mike": .a`,
@@ -92,27 +80,27 @@ var pathTests = []struct {
 	{
 		`{"mike": .a}`,
 		append(make([]interface{}, 0), "{", "mike (string)", "CREATE_MAP", "a", "}"),
-		append(make([]interface{}, 0), "mike (string)", "a", "CREATE_MAP", "COLLECT_OBJECT", "PIPE"),
+		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", "PIPE"),
+		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", "PIPE", "[]", "CREATE_MAP", "f", "PIPE", "g", "PIPE", "[]", "}"),
+		append(make([]interface{}, 0), "{", "a", "CREATE_MAP", "c", "UNION", "b", "SHORT_PIPE", "[]", "CREATE_MAP", "f", "SHORT_PIPE", "g", "SHORT_PIPE", "[]", "}"),
-		append(make([]interface{}, 0), "a", "c", "CREATE_MAP", "b", "[]", "PIPE", "f", "g", "PIPE", "[]", "PIPE", "CREATE_MAP", "UNION", "COLLECT_OBJECT", "PIPE"),
+		append(make([]interface{}, 0), "a", "c", "CREATE_MAP", "b", "[]", "SHORT_PIPE", "f", "g", "SHORT_PIPE", "[]", "SHORT_PIPE", "CREATE_MAP", "UNION", "COLLECT_OBJECT", "SHORT_PIPE"),
 	},
 	{
 		`explode(.a.b)`,
-		append(make([]interface{}, 0), "EXPLODE", "(", "a", "PIPE", "b", ")"),
+		append(make([]interface{}, 0), "EXPLODE", "(", "a", "SHORT_PIPE", "b", ")"),
-		append(make([]interface{}, 0), "a", "b", "PIPE", "EXPLODE"),
+		append(make([]interface{}, 0), "a", "b", "SHORT_PIPE", "EXPLODE"),
 	},
 	{
 		`.a.b style="folded"`,
-		append(make([]interface{}, 0), "a", "PIPE", "b", "ASSIGN_STYLE", "folded (string)"),
+		append(make([]interface{}, 0), "a", "SHORT_PIPE", "b", "ASSIGN_STYLE", "folded (string)"),
-		append(make([]interface{}, 0), "a", "b", "PIPE", "folded (string)", "ASSIGN_STYLE"),
+		append(make([]interface{}, 0), "a", "b", "SHORT_PIPE", "folded (string)", "ASSIGN_STYLE"),
 	},
 	{
 		`tag == "str"`,
@@ -135,11 +123,11 @@ var pathTests = []struct {
 		append(make([]interface{}, 0), "SELF", "str (string)", "ASSIGN_COMMENT"),
 	},
 
-	// {
+	{
-	// 	`.a.b tag="!!str"`,
+		`.a.b tag="!!str"`,
-	// 	append(make([]interface{}, 0), "EXPLODE", "(", "a", "PIPE", "b", ")"),
+		append(make([]interface{}, 0), "a", "SHORT_PIPE", "b", "ASSIGN_TAG", "!!str (string)"),
-	// 	append(make([]interface{}, 0), "a", "b", "PIPE", "EXPLODE"),
+		append(make([]interface{}, 0), "a", "b", "SHORT_PIPE", "!!str (string)", "ASSIGN_TAG"),
-	// },
+	},
 	{
 		`""`,
 		append(make([]interface{}, 0), " (string)"),
@@ -153,27 +141,8 @@ var pathTests = []struct {
 	{
 		`{}`,
 		append(make([]interface{}, 0), "{", "}"),
-		append(make([]interface{}, 0), "EMPTY", "COLLECT_OBJECT", "PIPE"),
+		append(make([]interface{}, 0), "EMPTY", "COLLECT_OBJECT", "SHORT_PIPE"),
 	},
-
-	// {".animals | .==cat", append(make([]interface{}, 0), "animals", "TRAVERSE", "SELF", "EQUALS", "cat")},
-	// {".animals | (. == cat)", append(make([]interface{}, 0), "animals", "TRAVERSE", "(", "SELF", "EQUALS", "cat", ")")},
-	// {".animals | (.==c*)", append(make([]interface{}, 0), "animals", "TRAVERSE", "(", "SELF", "EQUALS", "c*", ")")},
-	// {"animals(a.b==c*)", append(make([]interface{}, 0), "animals", "TRAVERSE", "(", "a", "TRAVERSE", "b", "==", "c*", ")")},
-	// {"animals.(a.b==c*)", append(make([]interface{}, 0), "animals", "TRAVERSE", "(", "a", "TRAVERSE", "b", "==", "c*", ")")},
-	// {"(a.b==c*).animals", append(make([]interface{}, 0), "(", "a", "TRAVERSE", "b", "==", "c*", ")", "TRAVERSE", "animals")},
-	// {"(a.b==c*)animals", append(make([]interface{}, 0), "(", "a", "TRAVERSE", "b", "==", "c*", ")", "TRAVERSE", "animals")},
-	// {"[1].a.d", append(make([]interface{}, 0), int64(1), "TRAVERSE", "a", "TRAVERSE", "d")},
-	// {"[1]a.d", append(make([]interface{}, 0), int64(1), "TRAVERSE", "a", "TRAVERSE", "d")},
-	// {"a[0]c", append(make([]interface{}, 0), "a", "TRAVERSE", int64(0), "TRAVERSE", "c")},
-	// {"a.[0].c", append(make([]interface{}, 0), "a", "TRAVERSE", int64(0), "TRAVERSE", "c")},
-	// {"[0]", append(make([]interface{}, 0), int64(0))},
-	// {"0", append(make([]interface{}, 0), int64(0))},
-	// {"a.b[+]c", append(make([]interface{}, 0), "a", "TRAVERSE", "b", "TRAVERSE", "[+]", "TRAVERSE", "c")},
-	// {"a.cool(s.d.f == cool)", append(make([]interface{}, 0), "a", "TRAVERSE", "cool", "TRAVERSE", "(", "s", "TRAVERSE", "d", "TRAVERSE", "f", " == ", "cool", ")")},
-	// {"a.cool.(s.d.f==cool OR t.b.h==frog).caterpillar", append(make([]interface{}, 0), "a", "TRAVERSE", "cool", "TRAVERSE", "(", "s", "TRAVERSE", "d", "TRAVERSE", "f", "==", "cool", "OR", "t", "TRAVERSE", "b", "TRAVERSE", "h", "==", "frog", ")", "TRAVERSE", "caterpillar")},
-	// {"a.cool(s.d.f==cool and t.b.h==frog)*", append(make([]interface{}, 0), "a", "TRAVERSE", "cool", "TRAVERSE", "(", "s", "TRAVERSE", "d", "TRAVERSE", "f", "==", "cool", "and", "t", "TRAVERSE", "b", "TRAVERSE", "h", "==", "frog", ")", "TRAVERSE", "*")},
-	// {"a.cool(s.d.f==cool and t.b.h==frog).th*", append(make([]interface{}, 0), "a", "TRAVERSE", "cool", "TRAVERSE", "(", "s", "TRAVERSE", "d", "TRAVERSE", "f", "==", "cool", "and", "t", "TRAVERSE", "b", "TRAVERSE", "h", "==", "frog", ")", "TRAVERSE", "th*")},
 }
 
 var tokeniser = NewPathTokeniser()

pkg/yqlib/path_postfix.go

@@ -56,7 +56,7 @@ func (p *pathPostFixer) ConvertToPostfix(infixTokens []*Token) ([]*Operation, er
 			// now we should have [] as the last element on the opStack, get rid of it
 			opStack = opStack[0 : len(opStack)-1]
 			//and append a collect to the opStack
-			opStack = append(opStack, &Token{TokenType: OperationToken, Operation: &Operation{OperationType: Pipe}})
+			opStack = append(opStack, &Token{TokenType: OperationToken, Operation: &Operation{OperationType: ShortPipe}})
 			opStack = append(opStack, &Token{TokenType: OperationToken, Operation: &Operation{OperationType: collectOperator}})
 		case CloseBracket:
 			for len(opStack) > 0 && opStack[len(opStack)-1].TokenType != OpenBracket {

pkg/yqlib/path_tokeniser.go

@@ -21,6 +21,7 @@ const (
 	CloseCollect
 	OpenCollectObject
 	CloseCollectObject
+	SplatOrEmptyCollect
 )
 
 type Token struct {
@@ -47,6 +48,8 @@ func (t *Token) toString() string {
 		return "{"
 	} else if t.TokenType == CloseCollectObject {
 		return "}"
+	} else if t.TokenType == SplatOrEmptyCollect {
+		return "[]?"
 	} else {
 		return "NFI"
 	}
@@ -247,6 +250,8 @@ func initLexer() (*lex.Lexer, error) {
 
 	lexer.Add([]byte(`"[^ "]*"`), stringValue(true))
 
+	lexer.Add([]byte(`\[\]`), literalToken(SplatOrEmptyCollect, true))
+
 	lexer.Add([]byte(`\[`), literalToken(OpenCollect, false))
 	lexer.Add([]byte(`\]`), literalToken(CloseCollect, true))
 	lexer.Add([]byte(`\{`), literalToken(OpenCollectObject, false))
@@ -301,28 +306,54 @@ func (p *pathTokeniser) Tokenise(path string) ([]*Token, error) {
 
 	skipNextToken := false
 
-	for index, token := range tokens {
+	for index := range tokens {
 		if skipNextToken {
 			skipNextToken = false
 		} else {
-
+			postProcessedTokens, skipNextToken = p.handleToken(tokens, index, postProcessedTokens)
-			if index != len(tokens)-1 && token.AssignOperation != nil &&
-				tokens[index+1].TokenType == OperationToken &&
-				tokens[index+1].Operation.OperationType == Assign {
-				token.Operation = token.AssignOperation
-				skipNextToken = true
-			}
-
-			postProcessedTokens = append(postProcessedTokens, token)
-
-			if index != len(tokens)-1 && token.CheckForPostTraverse &&
-				tokens[index+1].TokenType == OperationToken &&
-				tokens[index+1].Operation.OperationType == TraversePath {
-				op := &Operation{OperationType: Pipe, Value: "PIPE"}
-				postProcessedTokens = append(postProcessedTokens, &Token{TokenType: OperationToken, Operation: op})
-			}
 		}
 	}
 
 	return postProcessedTokens, nil
 }
+
+func (p *pathTokeniser) handleToken(tokens []*Token, index int, postProcessedTokens []*Token) (tokensAccum []*Token, skipNextToken bool) {
+	skipNextToken = false
+	token := tokens[index]
+	if token.TokenType == SplatOrEmptyCollect {
+		if index > 0 && tokens[index-1].TokenType == OperationToken &&
+			tokens[index-1].Operation.OperationType == TraversePath {
+			// must be a splat without a preceding dot , e.g. .a[]
+			// lets put a pipe in front of it, and convert it to a traverse "[]" token
+			pipeOp := &Operation{OperationType: ShortPipe, Value: "PIPE"}
+
+			postProcessedTokens = append(postProcessedTokens, &Token{TokenType: OperationToken, Operation: pipeOp})
+
+			traverseOp := &Operation{OperationType: TraversePath, Value: "[]", StringValue: "[]"}
+			token = &Token{TokenType: OperationToken, Operation: traverseOp, CheckForPostTraverse: true}
+
+		} else {
+			// gotta be a collect empty array, we need to split this into two tokens
+			// one OpenCollect, the other CloseCollect
+			postProcessedTokens = append(postProcessedTokens, &Token{TokenType: OpenCollect})
+			token = &Token{TokenType: CloseCollect, CheckForPostTraverse: true}
+		}
+	}
+
+	if index != len(tokens)-1 && token.AssignOperation != nil &&
+		tokens[index+1].TokenType == OperationToken &&
+		tokens[index+1].Operation.OperationType == Assign {
+		token.Operation = token.AssignOperation
+		skipNextToken = true
+	}
+
+	postProcessedTokens = append(postProcessedTokens, token)
+
+	if index != len(tokens)-1 && token.CheckForPostTraverse &&
+		tokens[index+1].TokenType == OperationToken &&
+		tokens[index+1].Operation.OperationType == TraversePath {
+		op := &Operation{OperationType: ShortPipe, Value: "PIPE"}
+		postProcessedTokens = append(postProcessedTokens, &Token{TokenType: OperationToken, Operation: op})
+	}
+	return postProcessedTokens, skipNextToken
+}

snap/snapcraft.yaml

@@ -1,5 +1,5 @@
 name: yq
-version: '4.0.0-beta1'
+version: '4.0.0-beta2'
 summary: A lightweight and portable command-line YAML processor
 description: |
   The aim of the project is to be the jq or sed of yaml files.