mirror of
https://github.com/mikefarah/yq.git
synced 2024-12-19 20:19:04 +00:00
507 lines
18 KiB
Go
507 lines
18 KiB
Go
package yqlib
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import (
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"fmt"
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"strconv"
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"strings"
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lex "github.com/timtadh/lexmachine"
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"github.com/timtadh/lexmachine/machines"
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)
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func skip(*lex.Scanner, *machines.Match) (interface{}, error) {
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return nil, nil
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}
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type tokenType uint32
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const (
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operationToken = 1 << iota
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openBracket
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closeBracket
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openCollect
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closeCollect
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openCollectObject
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closeCollectObject
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traverseArrayCollect
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)
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type token struct {
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TokenType tokenType
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Operation *Operation
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AssignOperation *Operation // e.g. tag (GetTag) op becomes AssignTag if '=' follows it
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CheckForPostTraverse bool // e.g. [1]cat should really be [1].cat
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Match *machines.Match // match that created this token
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}
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func (t *token) toString(detail bool) string {
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if t.TokenType == operationToken {
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if detail {
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return fmt.Sprintf("%v (%v)", t.Operation.toString(), t.Operation.OperationType.Precedence)
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}
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return t.Operation.toString()
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} else if t.TokenType == openBracket {
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return "("
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} else if t.TokenType == closeBracket {
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return ")"
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} else if t.TokenType == openCollect {
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return "["
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} else if t.TokenType == closeCollect {
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return "]"
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} else if t.TokenType == openCollectObject {
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return "{"
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} else if t.TokenType == closeCollectObject {
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return "}"
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} else if t.TokenType == traverseArrayCollect {
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return ".["
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} else {
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return "NFI"
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}
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}
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func pathToken(wrapped bool) lex.Action {
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return func(s *lex.Scanner, m *machines.Match) (interface{}, error) {
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value := string(m.Bytes)
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prefs := traversePreferences{}
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if value[len(value)-1:] == "?" {
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prefs.OptionalTraverse = true
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value = value[:len(value)-1]
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}
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value = value[1:]
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if wrapped {
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value = unwrap(value)
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}
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log.Debug("PathToken %v", value)
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op := &Operation{OperationType: traversePathOpType, Value: value, StringValue: value, Preferences: prefs}
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return &token{TokenType: operationToken, Operation: op, CheckForPostTraverse: true}, nil
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}
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}
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func opToken(op *operationType) lex.Action {
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return opTokenWithPrefs(op, nil, nil)
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}
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func opAssignableToken(opType *operationType, assignOpType *operationType) lex.Action {
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return opTokenWithPrefs(opType, assignOpType, nil)
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}
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func assignOpToken(updateAssign bool) lex.Action {
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return func(s *lex.Scanner, m *machines.Match) (interface{}, error) {
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log.Debug("assignOpToken %v", string(m.Bytes))
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value := string(m.Bytes)
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op := &Operation{OperationType: assignOpType, Value: assignOpType.Type, StringValue: value, UpdateAssign: updateAssign}
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return &token{TokenType: operationToken, Operation: op}, nil
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}
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}
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func multiplyWithPrefs() lex.Action {
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return func(s *lex.Scanner, m *machines.Match) (interface{}, error) {
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prefs := multiplyPreferences{}
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options := string(m.Bytes)
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if strings.Contains(options, "+") {
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prefs.AppendArrays = true
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}
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if strings.Contains(options, "?") {
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prefs.TraversePrefs = traversePreferences{DontAutoCreate: true}
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}
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if strings.Contains(options, "d") {
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prefs.DeepMergeArrays = true
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}
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prefs.TraversePrefs.DontFollowAlias = true
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op := &Operation{OperationType: multiplyOpType, Value: multiplyOpType.Type, StringValue: options, Preferences: prefs}
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return &token{TokenType: operationToken, Operation: op}, nil
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}
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}
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func opTokenWithPrefs(op *operationType, assignOpType *operationType, preferences interface{}) lex.Action {
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return func(s *lex.Scanner, m *machines.Match) (interface{}, error) {
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log.Debug("opTokenWithPrefs %v", string(m.Bytes))
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value := string(m.Bytes)
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op := &Operation{OperationType: op, Value: op.Type, StringValue: value, Preferences: preferences}
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var assign *Operation
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if assignOpType != nil {
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assign = &Operation{OperationType: assignOpType, Value: assignOpType.Type, StringValue: value, Preferences: preferences}
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}
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return &token{TokenType: operationToken, Operation: op, AssignOperation: assign}, nil
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}
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}
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func assignAllCommentsOp(updateAssign bool) lex.Action {
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return func(s *lex.Scanner, m *machines.Match) (interface{}, error) {
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log.Debug("assignAllCommentsOp %v", string(m.Bytes))
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value := string(m.Bytes)
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op := &Operation{
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OperationType: assignCommentOpType,
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Value: assignCommentOpType.Type,
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StringValue: value,
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UpdateAssign: updateAssign,
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Preferences: commentOpPreferences{LineComment: true, HeadComment: true, FootComment: true},
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}
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return &token{TokenType: operationToken, Operation: op}, nil
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}
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}
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func literalToken(pType tokenType, checkForPost bool) lex.Action {
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return func(s *lex.Scanner, m *machines.Match) (interface{}, error) {
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return &token{TokenType: pType, CheckForPostTraverse: checkForPost, Match: m}, nil
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}
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}
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func unwrap(value string) string {
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return value[1 : len(value)-1]
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}
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func numberValue() lex.Action {
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return func(s *lex.Scanner, m *machines.Match) (interface{}, error) {
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var numberString = string(m.Bytes)
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var number, errParsingInt = strconv.ParseInt(numberString, 10, 64) // nolint
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if errParsingInt != nil {
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return nil, errParsingInt
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}
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return &token{TokenType: operationToken, Operation: createValueOperation(number, numberString)}, nil
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}
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}
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func hexValue() lex.Action {
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return func(s *lex.Scanner, m *machines.Match) (interface{}, error) {
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var originalString = string(m.Bytes)
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var numberString = originalString[2:]
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log.Debugf("numberString: %v", numberString)
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var number, errParsingInt = strconv.ParseInt(numberString, 16, 64) // nolint
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if errParsingInt != nil {
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return nil, errParsingInt
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}
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return &token{TokenType: operationToken, Operation: createValueOperation(number, originalString)}, nil
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}
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}
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func floatValue() lex.Action {
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return func(s *lex.Scanner, m *machines.Match) (interface{}, error) {
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var numberString = string(m.Bytes)
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var number, errParsingInt = strconv.ParseFloat(numberString, 64) // nolint
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if errParsingInt != nil {
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return nil, errParsingInt
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}
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return &token{TokenType: operationToken, Operation: createValueOperation(number, numberString)}, nil
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}
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}
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func booleanValue(val bool) lex.Action {
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return func(s *lex.Scanner, m *machines.Match) (interface{}, error) {
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return &token{TokenType: operationToken, Operation: createValueOperation(val, string(m.Bytes))}, nil
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}
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}
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func stringValue(wrapped bool) lex.Action {
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return func(s *lex.Scanner, m *machines.Match) (interface{}, error) {
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value := string(m.Bytes)
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if wrapped {
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value = unwrap(value)
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}
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value = strings.ReplaceAll(value, "\\\"", "\"")
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return &token{TokenType: operationToken, Operation: createValueOperation(value, value)}, nil
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}
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}
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func getVariableOpToken() lex.Action {
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return func(s *lex.Scanner, m *machines.Match) (interface{}, error) {
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value := string(m.Bytes)
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value = value[1:]
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getVarOperation := createValueOperation(value, value)
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getVarOperation.OperationType = getVariableOpType
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return &token{TokenType: operationToken, Operation: getVarOperation, CheckForPostTraverse: true}, nil
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}
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}
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func envOp(strenv bool) lex.Action {
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return func(s *lex.Scanner, m *machines.Match) (interface{}, error) {
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value := string(m.Bytes)
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preferences := envOpPreferences{}
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if strenv {
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// strenv( )
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value = value[7 : len(value)-1]
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preferences.StringValue = true
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} else {
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//env( )
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value = value[4 : len(value)-1]
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}
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envOperation := createValueOperation(value, value)
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envOperation.OperationType = envOpType
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envOperation.Preferences = preferences
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return &token{TokenType: operationToken, Operation: envOperation}, nil
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}
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}
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func nullValue() lex.Action {
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return func(s *lex.Scanner, m *machines.Match) (interface{}, error) {
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return &token{TokenType: operationToken, Operation: createValueOperation(nil, string(m.Bytes))}, nil
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}
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}
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func selfToken() lex.Action {
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return func(s *lex.Scanner, m *machines.Match) (interface{}, error) {
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op := &Operation{OperationType: selfReferenceOpType}
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return &token{TokenType: operationToken, Operation: op}, nil
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}
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}
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func initLexer() (*lex.Lexer, error) {
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lexer := lex.NewLexer()
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lexer.Add([]byte(`\(`), literalToken(openBracket, false))
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lexer.Add([]byte(`\)`), literalToken(closeBracket, true))
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lexer.Add([]byte(`\.\[`), literalToken(traverseArrayCollect, false))
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lexer.Add([]byte(`\.\.`), opTokenWithPrefs(recursiveDescentOpType, nil, recursiveDescentPreferences{RecurseArray: true,
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TraversePreferences: traversePreferences{DontFollowAlias: true, IncludeMapKeys: false}}))
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lexer.Add([]byte(`\.\.\.`), opTokenWithPrefs(recursiveDescentOpType, nil, recursiveDescentPreferences{RecurseArray: true,
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TraversePreferences: traversePreferences{DontFollowAlias: true, IncludeMapKeys: true}}))
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lexer.Add([]byte(`,`), opToken(unionOpType))
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lexer.Add([]byte(`:\s*`), opToken(createMapOpType))
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lexer.Add([]byte(`length`), opToken(lengthOpType))
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lexer.Add([]byte(`toyaml`), opTokenWithPrefs(encodeOpType, nil, encoderPreferences{format: YamlOutputFormat}))
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lexer.Add([]byte(`tojson`), opTokenWithPrefs(encodeOpType, nil, encoderPreferences{format: JsonOutputFormat}))
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lexer.Add([]byte(`toprops`), opTokenWithPrefs(encodeOpType, nil, encoderPreferences{format: PropsOutputFormat}))
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lexer.Add([]byte(`to_yaml`), opTokenWithPrefs(encodeOpType, nil, encoderPreferences{format: YamlOutputFormat}))
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lexer.Add([]byte(`to_json`), opTokenWithPrefs(encodeOpType, nil, encoderPreferences{format: JsonOutputFormat}))
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lexer.Add([]byte(`to_props`), opTokenWithPrefs(encodeOpType, nil, encoderPreferences{format: PropsOutputFormat}))
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lexer.Add([]byte(`fromyaml`), opToken(decodeOpType))
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lexer.Add([]byte(`fromjson`), opToken(decodeOpType))
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lexer.Add([]byte(`from_yaml`), opToken(decodeOpType))
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lexer.Add([]byte(`from_json`), opToken(decodeOpType))
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lexer.Add([]byte(`sortKeys`), opToken(sortKeysOpType))
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lexer.Add([]byte(`select`), opToken(selectOpType))
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lexer.Add([]byte(`has`), opToken(hasOpType))
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lexer.Add([]byte(`unique`), opToken(uniqueOpType))
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lexer.Add([]byte(`unique_by`), opToken(uniqueByOpType))
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lexer.Add([]byte(`explode`), opToken(explodeOpType))
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lexer.Add([]byte(`or`), opToken(orOpType))
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lexer.Add([]byte(`and`), opToken(andOpType))
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lexer.Add([]byte(`not`), opToken(notOpType))
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lexer.Add([]byte(`ireduce`), opToken(reduceOpType))
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lexer.Add([]byte(`;`), opToken(blockOpType))
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lexer.Add([]byte(`\/\/`), opToken(alternativeOpType))
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lexer.Add([]byte(`documentIndex`), opToken(getDocumentIndexOpType))
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lexer.Add([]byte(`di`), opToken(getDocumentIndexOpType))
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lexer.Add([]byte(`splitDoc`), opToken(splitDocumentOpType))
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lexer.Add([]byte(`join`), opToken(joinStringOpType))
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lexer.Add([]byte(`sub`), opToken(subStringOpType))
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lexer.Add([]byte(`match`), opToken(matchOpType))
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lexer.Add([]byte(`capture`), opToken(captureOpType))
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lexer.Add([]byte(`test`), opToken(testOpType))
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lexer.Add([]byte(`any`), opToken(anyOpType))
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lexer.Add([]byte(`any_c`), opToken(anyConditionOpType))
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lexer.Add([]byte(`all`), opToken(allOpType))
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lexer.Add([]byte(`all_c`), opToken(allConditionOpType))
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lexer.Add([]byte(`contains`), opToken(containsOpType))
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lexer.Add([]byte(`split`), opToken(splitStringOpType))
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lexer.Add([]byte(`keys`), opToken(keysOpType))
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lexer.Add([]byte(`style`), opAssignableToken(getStyleOpType, assignStyleOpType))
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lexer.Add([]byte(`tag`), opAssignableToken(getTagOpType, assignTagOpType))
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lexer.Add([]byte(`anchor`), opAssignableToken(getAnchorOpType, assignAnchorOpType))
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lexer.Add([]byte(`alias`), opAssignableToken(getAliasOptype, assignAliasOpType))
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lexer.Add([]byte(`filename`), opToken(getFilenameOpType))
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lexer.Add([]byte(`fileIndex`), opToken(getFileIndexOpType))
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lexer.Add([]byte(`fi`), opToken(getFileIndexOpType))
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lexer.Add([]byte(`path`), opToken(getPathOpType))
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lexer.Add([]byte(`to_entries`), opToken(toEntriesOpType))
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lexer.Add([]byte(`from_entries`), opToken(fromEntriesOpType))
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lexer.Add([]byte(`with_entries`), opToken(withEntriesOpType))
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lexer.Add([]byte(`with`), opToken(withOpType))
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lexer.Add([]byte(`lineComment`), opTokenWithPrefs(getCommentOpType, assignCommentOpType, commentOpPreferences{LineComment: true}))
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lexer.Add([]byte(`headComment`), opTokenWithPrefs(getCommentOpType, assignCommentOpType, commentOpPreferences{HeadComment: true}))
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lexer.Add([]byte(`footComment`), opTokenWithPrefs(getCommentOpType, assignCommentOpType, commentOpPreferences{FootComment: true}))
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lexer.Add([]byte(`comments\s*=`), assignAllCommentsOp(false))
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lexer.Add([]byte(`comments\s*\|=`), assignAllCommentsOp(true))
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lexer.Add([]byte(`collect`), opToken(collectOpType))
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lexer.Add([]byte(`\s*==\s*`), opToken(equalsOpType))
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lexer.Add([]byte(`\s*!=\s*`), opToken(notEqualsOpType))
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lexer.Add([]byte(`\s*=\s*`), assignOpToken(false))
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lexer.Add([]byte(`del`), opToken(deleteChildOpType))
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lexer.Add([]byte(`\s*\|=\s*`), assignOpToken(true))
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lexer.Add([]byte("( |\t|\n|\r)+"), skip)
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lexer.Add([]byte(`\."[^ "]+"\??`), pathToken(true))
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lexer.Add([]byte(`\.[^ ;\}\{\:\[\],\|\.\[\(\)=\n]+\??`), pathToken(false))
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lexer.Add([]byte(`\.`), selfToken())
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lexer.Add([]byte(`\|`), opToken(pipeOpType))
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lexer.Add([]byte(`0[xX][0-9A-Fa-f]+`), hexValue())
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lexer.Add([]byte(`-?\d+(\.\d+)`), floatValue())
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lexer.Add([]byte(`-?[1-9](\.\d+)?[Ee][-+]?\d+`), floatValue())
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lexer.Add([]byte(`-?\d+`), numberValue())
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lexer.Add([]byte(`[Tt][Rr][Uu][Ee]`), booleanValue(true))
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lexer.Add([]byte(`[Ff][Aa][Ll][Ss][Ee]`), booleanValue(false))
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lexer.Add([]byte(`[Nn][Uu][Ll][Ll]`), nullValue())
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lexer.Add([]byte(`~`), nullValue())
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lexer.Add([]byte(`"([^"\\]*(\\.[^"\\]*)*)"`), stringValue(true))
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lexer.Add([]byte(`strenv\([^\)]+\)`), envOp(true))
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lexer.Add([]byte(`env\([^\)]+\)`), envOp(false))
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lexer.Add([]byte(`\[`), literalToken(openCollect, false))
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lexer.Add([]byte(`\]\??`), literalToken(closeCollect, true))
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lexer.Add([]byte(`\{`), literalToken(openCollectObject, false))
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lexer.Add([]byte(`\}`), literalToken(closeCollectObject, true))
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lexer.Add([]byte(`\*[\+|\?d]*`), multiplyWithPrefs())
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lexer.Add([]byte(`\+`), opToken(addOpType))
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lexer.Add([]byte(`\+=`), opToken(addAssignOpType))
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lexer.Add([]byte(`\-`), opToken(subtractOpType))
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lexer.Add([]byte(`\-=`), opToken(subtractAssignOpType))
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lexer.Add([]byte(`\$[a-zA-Z_-0-9]+`), getVariableOpToken())
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lexer.Add([]byte(`as`), opTokenWithPrefs(assignVariableOpType, nil, assignVarPreferences{}))
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lexer.Add([]byte(`ref`), opTokenWithPrefs(assignVariableOpType, nil, assignVarPreferences{IsReference: true}))
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err := lexer.CompileNFA()
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if err != nil {
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return nil, err
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}
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return lexer, nil
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}
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type expressionTokeniser interface {
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Tokenise(expression string) ([]*token, error)
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}
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type expressionTokeniserImpl struct {
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lexer *lex.Lexer
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}
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func newExpressionTokeniser() expressionTokeniser {
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var lexer, err = initLexer()
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if err != nil {
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panic(err)
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}
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return &expressionTokeniserImpl{lexer}
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}
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func (p *expressionTokeniserImpl) Tokenise(expression string) ([]*token, error) {
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scanner, err := p.lexer.Scanner([]byte(expression))
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if err != nil {
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return nil, fmt.Errorf("Parsing expression: %v", err)
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}
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var tokens []*token
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for tok, err, eof := scanner.Next(); !eof; tok, err, eof = scanner.Next() {
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if tok != nil {
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currentToken := tok.(*token)
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log.Debugf("Tokenising %v", currentToken.toString(true))
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tokens = append(tokens, currentToken)
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}
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if err != nil {
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return nil, fmt.Errorf("Parsing expression: %v", err)
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}
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}
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var postProcessedTokens = make([]*token, 0)
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skipNextToken := false
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for index := range tokens {
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if skipNextToken {
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skipNextToken = false
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} else {
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postProcessedTokens, skipNextToken = p.handleToken(tokens, index, postProcessedTokens)
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}
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}
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return postProcessedTokens, nil
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}
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func (p *expressionTokeniserImpl) handleToken(tokens []*token, index int, postProcessedTokens []*token) (tokensAccum []*token, skipNextToken bool) {
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skipNextToken = false
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currentToken := tokens[index]
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log.Debug("processing %v", currentToken.toString(true))
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|
if currentToken.TokenType == traverseArrayCollect {
|
|
// `.[exp]`` works by creating a traversal array of [self, exp] and piping that into the traverse array operator
|
|
//need to put a traverse array then a collect currentToken
|
|
// do this by adding traverse then converting currentToken to collect
|
|
|
|
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)) ||
|
|
(tokens[index+1].TokenType == traverseArrayCollect)) {
|
|
log.Debug(" adding pipe because the next thing is traverse")
|
|
op := &Operation{OperationType: shortPipeOpType, Value: "PIPE", StringValue: "."}
|
|
postProcessedTokens = append(postProcessedTokens, &token{TokenType: operationToken, Operation: op})
|
|
}
|
|
if index != len(tokens)-1 && currentToken.CheckForPostTraverse &&
|
|
tokens[index+1].TokenType == openCollect {
|
|
|
|
log.Debug(" adding traverArray because next is opencollect")
|
|
op := &Operation{OperationType: traverseArrayOpType}
|
|
postProcessedTokens = append(postProcessedTokens, &token{TokenType: operationToken, Operation: op})
|
|
}
|
|
return postProcessedTokens, skipNextToken
|
|
}
|