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Can assign-update aliases and anchors

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This commit is contained in:
Mike Farah 2021-01-06 20:30:48 +11:00
parent a7975df7cd
commit 3f58c4bc38
3 changed files with 90 additions and 13 deletions
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33
pkg/yqlib/doc/Anchor and Alias Operators.md
View File

@ -31,6 +31,22 @@ 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
@ -62,6 +78,23 @@ b: &meow purr
a: *meow
```
## 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

54
pkg/yqlib/operator_anchors_aliases.go
View File

@ -3,20 +3,22 @@ package yqlib
import (
"container/list"
"gopkg.in/yaml.v3"
yaml "gopkg.in/yaml.v3"
)
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 rhs.Front() != nil {
aliasName = rhs.Front().Value.(*CandidateNode).Node.Value
if !pathNode.Operation.UpdateAssign {
rhs, err := d.GetMatchingNodes(matchingNodes, pathNode.Rhs)
if err != nil {
return nil, err
}
if rhs.Front() != nil {
aliasName = rhs.Front().Value.(*CandidateNode).Node.Value
}
}
lhs, err := d.GetMatchingNodes(matchingNodes, pathNode.Lhs)
@ -28,6 +30,17 @@ func AssignAliasOperator(d *dataTreeNavigator, matchingNodes *list.List, pathNod
for el := lhs.Front(); el != nil; el = el.Next() {
candidate := el.Value.(*CandidateNode)
log.Debugf("Setting aliasName : %v", candidate.GetKey())
if pathNode.Operation.UpdateAssign {
rhs, err := d.GetMatchingNodes(nodeToMap(candidate), pathNode.Rhs)
if err != nil {
return nil, err
}
if rhs.Front() != nil {
aliasName = rhs.Front().Value.(*CandidateNode).Node.Value
}
}
candidate.Node.Kind = yaml.AliasNode
candidate.Node.Value = aliasName
}
@ -51,13 +64,16 @@ func AssignAnchorOperator(d *dataTreeNavigator, matchingNodes *list.List, pathNo
log.Debugf("AssignAnchor operator!")
rhs, err := d.GetMatchingNodes(matchingNodes, pathNode.Rhs)
if err != nil {
return nil, err
}
anchorName := ""
if rhs.Front() != nil {
anchorName = rhs.Front().Value.(*CandidateNode).Node.Value
if !pathNode.Operation.UpdateAssign {
rhs, err := d.GetMatchingNodes(matchingNodes, pathNode.Rhs)
if err != nil {
return nil, err
}
if rhs.Front() != nil {
anchorName = rhs.Front().Value.(*CandidateNode).Node.Value
}
}
lhs, err := d.GetMatchingNodes(matchingNodes, pathNode.Lhs)
@ -69,6 +85,18 @@ func AssignAnchorOperator(d *dataTreeNavigator, matchingNodes *list.List, pathNo
for el := lhs.Front(); el != nil; el = el.Next() {
candidate := el.Value.(*CandidateNode)
log.Debugf("Setting anchorName of : %v", candidate.GetKey())
if pathNode.Operation.UpdateAssign {
rhs, err := d.GetMatchingNodes(nodeToMap(candidate), pathNode.Rhs)
if err != nil {
return nil, err
}
if rhs.Front() != nil {
anchorName = rhs.Front().Value.(*CandidateNode).Node.Value
}
}
candidate.Node.Anchor = anchorName
}
return matchingNodes, nil

16
pkg/yqlib/operator_anchors_aliases_test.go
View File

@ -21,6 +21,14 @@ 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",
},
},
{
description: "Get alias",
document: `{b: &billyBob meow, a: *billyBob}`,
@ -37,6 +45,14 @@ var anchorOperatorScenarios = []expressionScenario{
"D0, P[], (doc)::{b: &meow purr, a: *meow}\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}}`,