mirror of
https://github.com/mikefarah/yq.git
synced 2024-12-19 20:19:04 +00:00
325 lines
9.9 KiB
Go
325 lines
9.9 KiB
Go
package yqlib
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import (
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"strconv"
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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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)
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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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}
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func (t *Token) toString() string {
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if t.TokenType == OperationToken {
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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 {
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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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value = value[1:]
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if wrapped {
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value = unwrap(value)
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}
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op := &Operation{OperationType: TraversePath, Value: value, StringValue: value}
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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 literalPathToken(value string) lex.Action {
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return func(s *lex.Scanner, m *machines.Match) (interface{}, error) {
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op := &Operation{OperationType: TraversePath, Value: value, StringValue: value}
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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 documentToken() 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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numberString = numberString[1:]
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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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op := &Operation{OperationType: DocumentFilter, Value: number, StringValue: numberString}
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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 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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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 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}, 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 arrayIndextoken(precedingDot bool) 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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startIndex := 1
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if precedingDot {
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startIndex = 2
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}
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numberString = numberString[startIndex : len(numberString)-1]
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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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op := &Operation{OperationType: TraversePath, Value: number, StringValue: numberString}
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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 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 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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return &Token{TokenType: OperationToken, Operation: CreateValueOperation(value, value)}, 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: SelfReference}
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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(`\.?\[\]`), literalPathToken("[]"))
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lexer.Add([]byte(`\.\.`), opToken(RecursiveDescent))
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lexer.Add([]byte(`,`), opToken(Union))
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lexer.Add([]byte(`:\s*`), opToken(CreateMap))
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lexer.Add([]byte(`length`), opToken(Length))
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lexer.Add([]byte(`select`), opToken(Select))
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lexer.Add([]byte(`explode`), opToken(Explode))
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lexer.Add([]byte(`or`), opToken(Or))
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lexer.Add([]byte(`and`), opToken(And))
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lexer.Add([]byte(`not`), opToken(Not))
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lexer.Add([]byte(`documentIndex`), opToken(GetDocumentIndex))
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lexer.Add([]byte(`style`), opAssignableToken(GetStyle, AssignStyle))
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lexer.Add([]byte(`tag`), opAssignableToken(GetTag, AssignTag))
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lexer.Add([]byte(`lineComment`), opTokenWithPrefs(GetComment, AssignComment, &CommentOpPreferences{LineComment: true}))
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lexer.Add([]byte(`headComment`), opTokenWithPrefs(GetComment, AssignComment, &CommentOpPreferences{HeadComment: true}))
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lexer.Add([]byte(`footComment`), opTokenWithPrefs(GetComment, AssignComment, &CommentOpPreferences{FootComment: true}))
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lexer.Add([]byte(`comments\s*=`), opTokenWithPrefs(AssignComment, nil, &CommentOpPreferences{LineComment: true, HeadComment: true, FootComment: true}))
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lexer.Add([]byte(`collect`), opToken(Collect))
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lexer.Add([]byte(`\s*==\s*`), opToken(Equals))
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lexer.Add([]byte(`\s*=\s*`), opTokenWithPrefs(Assign, nil, &AssignOpPreferences{false}))
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lexer.Add([]byte(`del`), opToken(DeleteChild))
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lexer.Add([]byte(`\s*\|=\s*`), opTokenWithPrefs(Assign, nil, &AssignOpPreferences{true}))
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lexer.Add([]byte(`\[-?[0-9]+\]`), arrayIndextoken(false))
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lexer.Add([]byte(`\.\[-?[0-9]+\]`), arrayIndextoken(true))
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lexer.Add([]byte("( |\t|\n|\r)+"), skip)
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lexer.Add([]byte(`d[0-9]+`), documentToken())
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lexer.Add([]byte(`\."[^ "]+"`), pathToken(true))
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lexer.Add([]byte(`\.[^ \}\{\:\[\],\|\.\[\(\)=]+`), pathToken(false))
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lexer.Add([]byte(`\.`), selfToken())
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lexer.Add([]byte(`\|`), opToken(Pipe))
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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(`\[`), literalToken(OpenCollect, false))
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lexer.Add([]byte(`\]`), 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(`\*`), opToken(Multiply))
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err := lexer.Compile()
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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 PathTokeniser interface {
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Tokenise(path string) ([]*Token, error)
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}
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type pathTokeniser struct {
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lexer *lex.Lexer
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}
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func NewPathTokeniser() PathTokeniser {
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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 &pathTokeniser{lexer}
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}
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func (p *pathTokeniser) Tokenise(path string) ([]*Token, error) {
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scanner, err := p.lexer.Scanner([]byte(path))
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if err != nil {
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return nil, 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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token := tok.(*Token)
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log.Debugf("Tokenising %v", token.toString())
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tokens = append(tokens, token)
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}
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if err != nil {
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return nil, 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, token := range tokens {
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if skipNextToken {
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skipNextToken = false
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} else {
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if index != len(tokens)-1 && token.AssignOperation != nil &&
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tokens[index+1].TokenType == OperationToken &&
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tokens[index+1].Operation.OperationType == Assign {
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token.Operation = token.AssignOperation
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skipNextToken = true
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}
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postProcessedTokens = append(postProcessedTokens, token)
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if index != len(tokens)-1 && token.CheckForPostTraverse &&
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tokens[index+1].TokenType == OperationToken &&
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tokens[index+1].Operation.OperationType == TraversePath {
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op := &Operation{OperationType: Pipe, Value: "PIPE"}
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postProcessedTokens = append(postProcessedTokens, &Token{TokenType: OperationToken, Operation: op})
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}
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}
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}
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return postProcessedTokens, nil
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}
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