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Can use expressions in slice #1419

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This commit is contained in:
Mike Farah 2022-11-10 18:03:18 +11:00
parent af7e36bd47
commit 04847502bf
8 changed files with 189 additions and 138 deletions
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23
pkg/yqlib/doc/operators/slice-array.md
View File

@ -80,3 +80,26 @@ will output
- frog
```
## Inserting into the middle of an array
using an expression to find the index
Given a sample.yml file of:
```yaml
- cat
- dog
- frog
- cow
```
then
```bash
yq '(.[] | select(. == "dog") | key + 1) as $pos | .[0:($pos)] + ["rabbit"] + .[$pos:]' sample.yml
```
will output
```yaml
- cat
- dog
- rabbit
- frog
- cow
```

31
pkg/yqlib/lexer.go
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@ -97,6 +97,10 @@ func postProcessTokens(tokens []*token) []*token {
return postProcessedTokens
}
func tokenIsOpType(token *token, opType *operationType) bool {
return token.TokenType == operationToken && token.Operation.OperationType == opType
}
func handleToken(tokens []*token, index int, postProcessedTokens []*token) (tokensAccum []*token, skipNextToken bool) {
skipNextToken = false
currentToken := tokens[index]
@ -120,9 +124,18 @@ func handleToken(tokens []*token, index int, postProcessedTokens []*token) (toke
}
if tokenIsOpType(currentToken, createMapOpType) {
log.Debugf("tokenIsOpType: createMapOpType")
// check the previous token is '[', means we are slice, but dont have a first number
if tokens[index-1].TokenType == traverseArrayCollect {
log.Debugf("previous token is : traverseArrayOpType")
// need to put the number 0 before this token, as that is implied
postProcessedTokens = append(postProcessedTokens, &token{TokenType: operationToken, Operation: createValueOperation(0, "0")})
}
}
if index != len(tokens)-1 && currentToken.AssignOperation != nil &&
tokens[index+1].TokenType == operationToken &&
tokens[index+1].Operation.OperationType == assignOpType {
tokenIsOpType(tokens[index+1], assignOpType) {
log.Debug(" its an update assign")
currentToken.Operation = currentToken.AssignOperation
currentToken.Operation.UpdateAssign = tokens[index+1].Operation.UpdateAssign
@ -132,6 +145,17 @@ func handleToken(tokens []*token, index int, postProcessedTokens []*token) (toke
log.Debug(" adding token to the fixed list")
postProcessedTokens = append(postProcessedTokens, currentToken)
if tokenIsOpType(currentToken, createMapOpType) {
log.Debugf("tokenIsOpType: createMapOpType")
// check the next token is ']', means we are slice, but dont have a second number
if index != len(tokens)-1 && tokens[index+1].TokenType == closeCollect {
log.Debugf("next token is : closeCollect")
// need to put the number 0 before this token, as that is implied
lengthOp := &Operation{OperationType: lengthOpType}
postProcessedTokens = append(postProcessedTokens, &token{TokenType: operationToken, Operation: lengthOp})
}
}
if index != len(tokens)-1 &&
((currentToken.TokenType == openCollect && tokens[index+1].TokenType == closeCollect) ||
(currentToken.TokenType == openCollectObject && tokens[index+1].TokenType == closeCollectObject)) {
@ -141,7 +165,8 @@ func handleToken(tokens []*token, index int, postProcessedTokens []*token) (toke
}
if index != len(tokens)-1 && currentToken.CheckForPostTraverse &&
((tokens[index+1].TokenType == operationToken && (tokens[index+1].Operation.OperationType == traversePathOpType)) ||
(tokenIsOpType(tokens[index+1], traversePathOpType) ||
(tokens[index+1].TokenType == traverseArrayCollect)) {
log.Debug(" adding pipe because the next thing is traverse")
op := &Operation{OperationType: shortPipeOpType, Value: "PIPE", StringValue: "."}

83
pkg/yqlib/lexer_participle.go
View File

@ -1,7 +1,6 @@
package yqlib
import (
"regexp"
"strconv"
"strings"
@ -13,10 +12,6 @@ var participleYqRules = []*participleYqRule{
{"HEAD_COMMENT", `head_?comment|headComment`, opTokenWithPrefs(getCommentOpType, assignCommentOpType, commentOpPreferences{HeadComment: true}), 0},
{"FOOT_COMMENT", `foot_?comment|footComment`, opTokenWithPrefs(getCommentOpType, assignCommentOpType, commentOpPreferences{FootComment: true}), 0},
{"SliceArray", `\.\[-?[0-9]+:-?[0-9]+\]`, sliceArrayTwoNumbers(), 0},
{"SliceArraySecond", `\.\[\:-?[0-9]+\]`, sliceArraySecondNumberOnly(), 0},
{"SliceArrayFirst", `\.\[-?[0-9]+\:\]`, sliceArrayFirstNumberOnly(), 0},
{"OpenBracket", `\(`, literalToken(openBracket, false), 0},
{"CloseBracket", `\)`, literalToken(closeBracket, true), 0},
{"OpenTraverseArrayCollect", `\.\[`, literalToken(traverseArrayCollect, false), 0},
@ -315,84 +310,6 @@ func flattenWithDepth() yqAction {
}
}
func sliceArrayTwoNumbers() yqAction {
return func(rawToken lexer.Token) (*token, error) {
value := rawToken.Value
sliceArrayNumbers := regexp.MustCompile(`\.\[(-?[0-9]+)\:(-?[0-9]+)\]`)
matches := sliceArrayNumbers.FindStringSubmatch(value)
log.Debug("sliceArrayTwoNumbers value: %v", value)
log.Debug("Matches: %v", matches)
firstNumber, err := parseInt(matches[1])
if err != nil {
return nil, err
}
secondNumber, err := parseInt(matches[2])
if err != nil {
return nil, err
}
prefs := sliceArrayPreferences{
firstNumber: firstNumber,
secondNumber: secondNumber,
secondNumberDefined: true,
}
log.Debug("%v", prefs)
op := &Operation{OperationType: sliceArrayOpType, Value: sliceArrayOpType.Type, StringValue: value, Preferences: prefs}
return &token{TokenType: operationToken, Operation: op}, nil
}
}
func sliceArraySecondNumberOnly() yqAction {
return func(rawToken lexer.Token) (*token, error) {
value := rawToken.Value
sliceArrayNumbers := regexp.MustCompile(`\.\[\:(-?[0-9]+)\]`)
matches := sliceArrayNumbers.FindStringSubmatch(value)
log.Debug("sliceArraySecondNumberOnly value: %v", value)
log.Debug("Matches: %v", matches)
secondNumber, err := parseInt(matches[1])
if err != nil {
return nil, err
}
prefs := sliceArrayPreferences{
firstNumber: 0,
secondNumber: secondNumber,
secondNumberDefined: true,
}
log.Debug("%v", prefs)
op := &Operation{OperationType: sliceArrayOpType, Value: sliceArrayOpType.Type, StringValue: value, Preferences: prefs}
return &token{TokenType: operationToken, Operation: op}, nil
}
}
func sliceArrayFirstNumberOnly() yqAction {
return func(rawToken lexer.Token) (*token, error) {
value := rawToken.Value
sliceArrayNumbers := regexp.MustCompile(`\.\[(-?[0-9]+)\:\]`)
matches := sliceArrayNumbers.FindStringSubmatch(value)
log.Debug("sliceArrayFirstNumberOnly value: %v", value)
log.Debug("Matches: %v", matches)
firstNumber, err := parseInt(matches[1])
if err != nil {
return nil, err
}
prefs := sliceArrayPreferences{
firstNumber: firstNumber,
secondNumberDefined: false,
}
log.Debug("%v", prefs)
op := &Operation{OperationType: sliceArrayOpType, Value: sliceArrayOpType.Type, StringValue: value, Preferences: prefs}
return &token{TokenType: operationToken, Operation: op}, nil
}
}
func assignAllCommentsOp(updateAssign bool) yqAction {
return func(rawToken lexer.Token) (*token, error) {
log.Debug("assignAllCommentsOp %v", rawToken.Value)

131
pkg/yqlib/lexer_participle_test.go
View File

@ -5,7 +5,7 @@ import (
"github.com/alecthomas/repr"
"github.com/mikefarah/yq/v4/test"
"gopkg.in/yaml.v3"
yaml "gopkg.in/yaml.v3"
)
type participleLexerScenario struct {
@ -14,60 +14,125 @@ type participleLexerScenario struct {
}
var participleLexerScenarios = []participleLexerScenario{
{
expression: ".[1:3]",
tokens: []*token{
{
TokenType: operationToken,
Operation: &Operation{
OperationType: sliceArrayOpType,
Value: "SLICE",
StringValue: ".[1:3]",
Preferences: sliceArrayPreferences{firstNumber: 1, secondNumber: 3, secondNumberDefined: true},
},
},
},
},
{
expression: ".[:3]",
tokens: []*token{
{
TokenType: operationToken,
Operation: &Operation{
OperationType: sliceArrayOpType,
Value: "SLICE",
StringValue: ".[:3]",
Preferences: sliceArrayPreferences{firstNumber: 0, secondNumber: 3, secondNumberDefined: true},
OperationType: selfReferenceOpType,
StringValue: "SELF",
},
},
{
TokenType: operationToken,
Operation: &Operation{
OperationType: traverseArrayOpType,
StringValue: "TRAVERSE_ARRAY",
},
},
{
TokenType: openCollect,
},
{
TokenType: operationToken,
Operation: &Operation{
OperationType: valueOpType,
Value: 0,
StringValue: "0",
CandidateNode: &CandidateNode{
Node: &yaml.Node{
Kind: yaml.ScalarNode,
Tag: "!!int",
Value: "0",
},
},
},
},
{
TokenType: operationToken,
Operation: &Operation{
OperationType: createMapOpType,
Value: "CREATE_MAP",
StringValue: ":",
},
},
{
TokenType: operationToken,
Operation: &Operation{
OperationType: valueOpType,
Value: 3,
StringValue: "3",
CandidateNode: &CandidateNode{
Node: &yaml.Node{
Kind: yaml.Kind(8),
Tag: "!!int",
Value: "3",
},
},
},
},
{
TokenType: closeCollect,
CheckForPostTraverse: true,
Match: "]",
},
},
},
{
expression: ".[1:]",
expression: ".[-2:]",
tokens: []*token{
{
TokenType: operationToken,
Operation: &Operation{
OperationType: sliceArrayOpType,
Value: "SLICE",
StringValue: ".[1:]",
Preferences: sliceArrayPreferences{firstNumber: 1, secondNumber: 0, secondNumberDefined: false},
OperationType: selfReferenceOpType,
StringValue: "SELF",
},
},
},
},
{
expression: ".[-100:-54]",
tokens: []*token{
{
TokenType: operationToken,
Operation: &Operation{
OperationType: sliceArrayOpType,
Value: "SLICE",
StringValue: ".[-100:-54]",
Preferences: sliceArrayPreferences{firstNumber: -100, secondNumber: -54, secondNumberDefined: true},
OperationType: traverseArrayOpType,
StringValue: "TRAVERSE_ARRAY",
},
},
{
TokenType: openCollect,
},
{
TokenType: operationToken,
Operation: &Operation{
OperationType: valueOpType,
Value: -2,
StringValue: "-2",
CandidateNode: &CandidateNode{
Node: &yaml.Node{
Kind: yaml.ScalarNode,
Tag: "!!int",
Value: "-2",
},
},
},
},
{
TokenType: operationToken,
Operation: &Operation{
OperationType: createMapOpType,
Value: "CREATE_MAP",
StringValue: ":",
},
},
{
TokenType: operationToken,
Operation: &Operation{
OperationType: lengthOpType,
},
},
{
TokenType: closeCollect,
CheckForPostTraverse: true,
Match: "]",
},
},
},
{

1
pkg/yqlib/lib.go
View File

@ -83,7 +83,6 @@ var columnOpType = &operationType{Type: "LINE", NumArgs: 0, Precedence: 50, Hand
var expressionOpType = &operationType{Type: "EXP", NumArgs: 0, Precedence: 50, Handler: expressionOperator}
var collectOpType = &operationType{Type: "COLLECT", NumArgs: 1, Precedence: 50, Handler: collectOperator}
var sliceArrayOpType = &operationType{Type: "SLICE", NumArgs: 0, Precedence: 50, Handler: sliceArrayOperator}
var mapOpType = &operationType{Type: "MAP", NumArgs: 1, Precedence: 50, Handler: mapOperator}
var errorOpType = &operationType{Type: "ERROR", NumArgs: 1, Precedence: 50, Handler: errorOperator}
var pickOpType = &operationType{Type: "PICK", NumArgs: 1, Precedence: 50, Handler: pickOperator}

45
pkg/yqlib/operator_slice.go
View File

@ -2,43 +2,52 @@ package yqlib
import (
"container/list"
"fmt"
yaml "gopkg.in/yaml.v3"
)
type sliceArrayPreferences struct {
firstNumber int
secondNumber int
secondNumberDefined bool
func getSliceNumber(d *dataTreeNavigator, context Context, node *CandidateNode, expressionNode *ExpressionNode) (int, error) {
result, err := d.GetMatchingNodes(context.SingleChildContext(node), expressionNode)
if err != nil {
return 0, err
}
if result.MatchingNodes.Len() != 1 {
return 0, fmt.Errorf("expected to find 1 number, got %v instead", result.MatchingNodes.Len())
}
return parseInt(result.MatchingNodes.Front().Value.(*CandidateNode).Node.Value)
}
func sliceArrayOperator(d *dataTreeNavigator, context Context, expressionNode *ExpressionNode) (Context, error) {
lhs, err := d.GetMatchingNodes(context, expressionNode.LHS)
if err != nil {
return Context{}, err
}
prefs := expressionNode.Operation.Preferences.(sliceArrayPreferences)
firstNumber := prefs.firstNumber
secondNumber := prefs.secondNumber
log.Debug("slice array operator!")
log.Debug("lhs: %v", expressionNode.LHS.Operation.toString())
log.Debug("rhs: %v", expressionNode.RHS.Operation.toString())
results := list.New()
for el := lhs.MatchingNodes.Front(); el != nil; el = el.Next() {
for el := context.MatchingNodes.Front(); el != nil; el = el.Next() {
lhsNode := el.Value.(*CandidateNode)
original := unwrapDoc(lhsNode.Node)
firstNumber, err := getSliceNumber(d, context, lhsNode, expressionNode.LHS)
if err != nil {
return Context{}, err
}
relativeFirstNumber := firstNumber
if relativeFirstNumber < 0 {
relativeFirstNumber = len(original.Content) + firstNumber
}
relativeSecondNumber := len(original.Content)
if prefs.secondNumberDefined {
relativeSecondNumber = secondNumber
if relativeSecondNumber < 0 {
relativeSecondNumber = len(original.Content) + secondNumber
}
secondNumber, err := getSliceNumber(d, context, lhsNode, expressionNode.RHS)
if err != nil {
return Context{}, err
}
relativeSecondNumber := secondNumber
if relativeSecondNumber < 0 {
relativeSecondNumber = len(original.Content) + secondNumber
}
log.Debug("calculateIndicesToTraverse: slice from %v to %v", relativeFirstNumber, relativeSecondNumber)

9
pkg/yqlib/operator_slice_test.go
View File

@ -37,6 +37,15 @@ var sliceArrayScenarios = []expressionScenario{
"D0, P[], (!!seq)::- dog\n- frog\n",
},
},
{
description: "Inserting into the middle of an array",
subdescription: "using an expression to find the index",
document: `[cat, dog, frog, cow]`,
expression: `(.[] | select(. == "dog") | key + 1) as $pos | .[0:($pos)] + ["rabbit"] + .[$pos:]`,
expected: []string{
"D0, P[], (!!seq)::- cat\n- dog\n- rabbit\n- frog\n- cow\n",
},
},
{
skipDoc: true,
document: `[[cat, dog, frog, cow], [apple, banana, grape, mango]]`,

4
pkg/yqlib/operator_traverse_path.go
View File

@ -80,6 +80,10 @@ func traverseArrayOperator(d *dataTreeNavigator, context Context, expressionNode
// BUT we still return the original context back (see jq)
// https://stedolan.github.io/jq/manual/#Variable/SymbolicBindingOperator:...as$identifier|...
if expressionNode.RHS != nil && expressionNode.RHS.RHS != nil && expressionNode.RHS.RHS.Operation.OperationType == createMapOpType {
return sliceArrayOperator(d, context, expressionNode.RHS.RHS)
}
lhs, err := d.GetMatchingNodes(context, expressionNode.LHS)
if err != nil {
return Context{}, err