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Added recurse keys operator

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This commit is contained in:
Mike Farah
2020-12-28 11:24:42 +11:00
parent b10a9ccfc6
commit 88663a6ce3
10 changed files with 273 additions and 43 deletions
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49
pkg/yqlib/doc/Recursive Descent.md
View File

@@ -1,8 +1,55 @@
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, for instance to set the `style` of all nodes in a yaml doc:
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.
For instance to set the `style` of all _value_ nodes in a yaml doc, excluding map keys:
```bash
yq eval '.. style= "flow"' file.yaml
```
## match values and map keys form `...`
The also includes map keys in the results set. This is particularly useful in YAML as unlike JSON, map keys can have their own styling, tags and use anchors and aliases.
For instance to set the `style` of all nodes in a yaml doc, including the map keys:
```bash
yq eval '... style= "flow"' file.yaml
```
## Recurse map (values only)
Given a sample.yml file of:
```yaml
a: frog
```
then
```bash
yq eval '..' sample.yml
```
will output
```yaml
a: frog
frog
```
## Recurse map (values and keys)
Note that the map key appears in the results
Given a sample.yml file of:
```yaml
a: frog
```
then
```bash
yq eval '...' sample.yml
```
will output
```yaml
a: frog
a
frog
```
## Aliases are not traversed
Given a sample.yml file of:
```yaml

30
pkg/yqlib/doc/Style.md
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@@ -40,6 +40,26 @@ c: "3.2"
e: "true"
```
## Set double quote style on map keys too
Given a sample.yml file of:
```yaml
a: cat
b: 5
c: 3.2
e: true
```
then
```bash
yq eval '... style="double"' sample.yml
```
will output
```yaml
"a": "cat"
"b": "5"
"c": "3.2"
"e": "true"
```
## Set single quote style
Given a sample.yml file of:
```yaml
@@ -126,18 +146,18 @@ will output
```
## Pretty print
Set empty (default) quote style
Set empty (default) quote style, note the usage of `...` to match keys too.
Given a sample.yml file of:
```yaml
a: cat
b: 5
c: 3.2
e: true
"b": 5
'c': 3.2
"e": true
```
then
```bash
yq eval '.. style=""' sample.yml
yq eval '... style=""' sample.yml
```
will output
```yaml

16
pkg/yqlib/doc/headers/Recursive Descent.md
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@@ -1,5 +1,19 @@
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, for instance to set the `style` of all nodes in a yaml doc:
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.
For instance to set the `style` of all _value_ nodes in a yaml doc, excluding map keys:
```bash
yq eval '.. style= "flow"' file.yaml
```
## match values and map keys form `...`
The also includes map keys in the results set. This is particularly useful in YAML as unlike JSON, map keys can have their own styling, tags and use anchors and aliases.
For instance to set the `style` of all nodes in a yaml doc, including the map keys:
```bash
yq eval '... style= "flow"' file.yaml
```