// Code generated by maleeni-go. DO NOT EDIT. package test import ( "fmt" "io" "io/ioutil" ) type ModeID int func (id ModeID) Int() int { return int(id) } type StateID int func (id StateID) Int() int { return int(id) } type KindID int func (id KindID) Int() int { return int(id) } type ModeKindID int func (id ModeKindID) Int() int { return int(id) } type LexSpec interface { InitialMode() ModeID Pop(mode ModeID, modeKind ModeKindID) bool Push(mode ModeID, modeKind ModeKindID) (ModeID, bool) ModeName(mode ModeID) string InitialState(mode ModeID) StateID NextState(mode ModeID, state StateID, v int) (StateID, bool) Accept(mode ModeID, state StateID) (ModeKindID, bool) KindIDAndName(mode ModeID, modeKind ModeKindID) (KindID, string) } // Token representes a token. type Token struct { // ModeID is an ID of a lex mode. ModeID ModeID // KindID is an ID of a kind. This is unique among all modes. KindID KindID // ModeKindID is an ID of a lexical kind. This is unique only within a mode. // Note that you need to use KindID field if you want to identify a kind across all modes. ModeKindID ModeKindID // Row is a row number where a lexeme appears. Row int // Col is a column number where a lexeme appears. // Note that Col is counted in code points, not bytes. Col int // Lexeme is a byte sequence matched a pattern of a lexical specification. Lexeme []byte // When this field is true, it means the token is the EOF token. EOF bool // When this field is true, it means the token is an error token. Invalid bool } type LexerOption func(l *Lexer) error // DisableModeTransition disables the active mode transition. Thus, even if the lexical specification has the push and pop // operations, the lexer doesn't perform these operations. When the lexical specification has multiple modes, and this option is // enabled, you need to call the Lexer.Push and Lexer.Pop methods to perform the mode transition. You can use the Lexer.Mode method // to know the current lex mode. func DisableModeTransition() LexerOption { return func(l *Lexer) error { l.passiveModeTran = true return nil } } type Lexer struct { spec LexSpec src []byte srcPtr int row int col int prevRow int prevCol int tokBuf []*Token modeStack []ModeID passiveModeTran bool } // NewLexer returns a new lexer. func NewLexer(spec LexSpec, src io.Reader, opts ...LexerOption) (*Lexer, error) { b, err := ioutil.ReadAll(src) if err != nil { return nil, err } l := &Lexer{ spec: spec, src: b, srcPtr: 0, row: 0, col: 0, modeStack: []ModeID{ spec.InitialMode(), }, passiveModeTran: false, } for _, opt := range opts { err := opt(l) if err != nil { return nil, err } } return l, nil } // Next returns a next token. func (l *Lexer) Next() (*Token, error) { if len(l.tokBuf) > 0 { tok := l.tokBuf[0] l.tokBuf = l.tokBuf[1:] return tok, nil } tok, err := l.nextAndTransition() if err != nil { return nil, err } if !tok.Invalid { return tok, nil } errTok := tok for { tok, err = l.nextAndTransition() if err != nil { return nil, err } if !tok.Invalid { break } errTok.Lexeme = append(errTok.Lexeme, tok.Lexeme...) } l.tokBuf = append(l.tokBuf, tok) return errTok, nil } func (l *Lexer) nextAndTransition() (*Token, error) { tok, err := l.next() if err != nil { return nil, err } if tok.EOF || tok.Invalid { return tok, nil } if l.passiveModeTran { return tok, nil } mode := l.Mode() if l.spec.Pop(mode, tok.ModeKindID) { err := l.PopMode() if err != nil { return nil, err } } if mode, ok := l.spec.Push(mode, tok.ModeKindID); ok { l.PushMode(mode) } // The checking length of the mode stack must be at after pop and push operations because those operations can be performed // at the same time. When the mode stack has just one element and popped it, the mode stack will be temporarily emptied. // However, since a push operation may be performed immediately after it, the lexer allows the stack to be temporarily empty. if len(l.modeStack) == 0 { return nil, fmt.Errorf("a mode stack must have at least one element") } return tok, nil } func (l *Lexer) next() (*Token, error) { mode := l.Mode() state := l.spec.InitialState(mode) buf := []byte{} unfixedBufLen := 0 row := l.row col := l.col var tok *Token for { v, eof := l.read() if eof { if tok != nil { l.unread(unfixedBufLen) return tok, nil } // When `buf` has unaccepted data and reads the EOF, the lexer treats the buffered data as an invalid token. if len(buf) > 0 { return &Token{ ModeID: mode, ModeKindID: 0, Lexeme: buf, Row: row, Col: col, Invalid: true, }, nil } return &Token{ ModeID: mode, ModeKindID: 0, Row: 0, Col: 0, EOF: true, }, nil } buf = append(buf, v) unfixedBufLen++ nextState, ok := l.spec.NextState(mode, state, int(v)) if !ok { if tok != nil { l.unread(unfixedBufLen) return tok, nil } return &Token{ ModeID: mode, ModeKindID: 0, Lexeme: buf, Row: row, Col: col, Invalid: true, }, nil } state = nextState if modeKindID, ok := l.spec.Accept(mode, state); ok { kindID, _ := l.spec.KindIDAndName(mode, modeKindID) tok = &Token{ ModeID: mode, KindID: kindID, ModeKindID: modeKindID, Lexeme: buf, Row: row, Col: col, } unfixedBufLen = 0 } } } // Mode returns the current lex mode. func (l *Lexer) Mode() ModeID { return l.modeStack[len(l.modeStack)-1] } // PushMode adds a lex mode onto the mode stack. func (l *Lexer) PushMode(mode ModeID) { l.modeStack = append(l.modeStack, mode) } // PopMode removes a lex mode from the top of the mode stack. func (l *Lexer) PopMode() error { sLen := len(l.modeStack) if sLen == 0 { return fmt.Errorf("cannot pop a lex mode from a lex mode stack any more") } l.modeStack = l.modeStack[:sLen-1] return nil } func (l *Lexer) read() (byte, bool) { if l.srcPtr >= len(l.src) { return 0, true } b := l.src[l.srcPtr] l.srcPtr++ l.prevRow = l.row l.prevCol = l.col // Count the token positions. // The driver treats LF as the end of lines and counts columns in code points, not bytes. // To count in code points, we refer to the First Byte column in the Table 3-6. // // Reference: // - [Table 3-6] https://www.unicode.org/versions/Unicode13.0.0/ch03.pdf > Table 3-6. UTF-8 Bit Distribution if b < 128 { // 0x0A is LF. if b == 0x0A { l.row++ l.col = 0 } else { l.col++ } } else if b>>5 == 6 || b>>4 == 14 || b>>3 == 30 { l.col++ } return b, false } // We must not call this function consecutively to record the token position correctly. func (l *Lexer) unread(n int) { l.srcPtr -= n l.row = l.prevRow l.col = l.prevCol } const ( ModeIDNil ModeID = 0 ModeIDDefault ModeID = 1 ModeIDRawString ModeID = 2 ModeIDInterpretedString ModeID = 3 ) const ( ModeNameNil = "" ModeNameDefault = "default" ModeNameRawString = "raw_string" ModeNameInterpretedString = "interpreted_string" ) // ModeIDToName converts a mode ID to a name. func ModeIDToName(id ModeID) string { switch id { case ModeIDNil: return ModeNameNil case ModeIDDefault: return ModeNameDefault case ModeIDRawString: return ModeNameRawString case ModeIDInterpretedString: return ModeNameInterpretedString } return "" } const ( KindIDNil KindID = 0 KindIDWs KindID = 1 KindIDLParen KindID = 2 KindIDRParen KindID = 3 KindIDIdentifier KindID = 4 KindIDRawStringOpen KindID = 5 KindIDInterpretedStringOpen KindID = 6 KindIDRawStringBody KindID = 7 KindIDRawStringClose KindID = 8 KindIDInterpretedSeq KindID = 9 KindIDCodepointPrefix KindID = 10 KindIDLBrace KindID = 11 KindIDRBrace KindID = 12 KindIDHexDigits KindID = 13 KindIDEscapedSeq KindID = 14 KindIDEscapeChar KindID = 15 KindIDInterpretedStringClose KindID = 16 ) const ( KindNameNil = "" KindNameWs = "ws" KindNameLParen = "l_paren" KindNameRParen = "r_paren" KindNameIdentifier = "identifier" KindNameRawStringOpen = "raw_string_open" KindNameInterpretedStringOpen = "interpreted_string_open" KindNameRawStringBody = "raw_string_body" KindNameRawStringClose = "raw_string_close" KindNameInterpretedSeq = "interpreted_seq" KindNameCodepointPrefix = "codepoint_prefix" KindNameLBrace = "l_brace" KindNameRBrace = "r_brace" KindNameHexDigits = "hex_digits" KindNameEscapedSeq = "escaped_seq" KindNameEscapeChar = "escape_char" KindNameInterpretedStringClose = "interpreted_string_close" ) // KindIDToName converts a kind ID to a name. func KindIDToName(id KindID) string { switch id { case KindIDNil: return KindNameNil case KindIDWs: return KindNameWs case KindIDLParen: return KindNameLParen case KindIDRParen: return KindNameRParen case KindIDIdentifier: return KindNameIdentifier case KindIDRawStringOpen: return KindNameRawStringOpen case KindIDInterpretedStringOpen: return KindNameInterpretedStringOpen case KindIDRawStringBody: return KindNameRawStringBody case KindIDRawStringClose: return KindNameRawStringClose case KindIDInterpretedSeq: return KindNameInterpretedSeq case KindIDCodepointPrefix: return KindNameCodepointPrefix case KindIDLBrace: return KindNameLBrace case KindIDRBrace: return KindNameRBrace case KindIDHexDigits: return KindNameHexDigits case KindIDEscapedSeq: return KindNameEscapedSeq case KindIDEscapeChar: return KindNameEscapeChar case KindIDInterpretedStringClose: return KindNameInterpretedStringClose } return "" } type lexSpec struct { pop [][]bool push [][]ModeID modeNames []string initialStates []StateID acceptances [][]ModeKindID kindIDs [][]KindID kindNames []string initialModeID ModeID modeIDNil ModeID modeKindIDNil ModeKindID stateIDNil StateID rowNums [][]int rowDisplacements [][]int bounds [][]int entries [][]StateID originalColCounts []int } func NewLexSpec() *lexSpec { return &lexSpec{ pop: [][]bool{ nil, { false, false, false, false, false, false, false, }, { false, false, true, }, { false, false, false, false, false, false, false, false, true, }, }, push: [][]ModeID{ nil, { 0, 0, 0, 0, 0, 2, 3, }, { 0, 0, 0, }, { 0, 0, 0, 0, 0, 0, 0, 0, 0, }, }, modeNames: []string{ ModeNameNil, ModeNameDefault, ModeNameRawString, ModeNameInterpretedString, }, initialStates: []StateID{ 0, 1, 1, 1, }, acceptances: [][]ModeKindID{ nil, { 0, 0, 1, 4, 2, 3, 5, 6, }, { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 2, }, { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 7, 5, 2, 3, 4, 6, 8, }, }, kindIDs: [][]KindID{ nil, { KindIDNil, KindIDWs, KindIDLParen, KindIDRParen, KindIDIdentifier, KindIDRawStringOpen, KindIDInterpretedStringOpen, }, { KindIDNil, KindIDRawStringBody, KindIDRawStringClose, }, { KindIDNil, KindIDInterpretedSeq, KindIDCodepointPrefix, KindIDLBrace, KindIDRBrace, KindIDHexDigits, KindIDEscapedSeq, KindIDEscapeChar, KindIDInterpretedStringClose, }, }, kindNames: []string{ KindNameNil, KindNameWs, KindNameLParen, KindNameRParen, KindNameIdentifier, KindNameRawStringOpen, KindNameInterpretedStringOpen, KindNameRawStringBody, KindNameRawStringClose, KindNameInterpretedSeq, KindNameCodepointPrefix, KindNameLBrace, KindNameRBrace, KindNameHexDigits, KindNameEscapedSeq, KindNameEscapeChar, KindNameInterpretedStringClose, }, initialModeID: ModeIDDefault, modeIDNil: ModeIDNil, modeKindIDNil: 0, stateIDNil: 0, rowNums: [][]int{ nil, { 0, 1, 2, 3, 0, 0, 0, 0, }, { 0, 1, 2, 3, 2, 4, 2, 5, 2, 6, 2, 7, 8, 2, 9, 10, 2, 11, 12, 2, 13, 2, 14, 2, 15, 2, 16, 2, 17, 2, 18, 19, 2, 20, 21, 2, 22, 23, 2, 0, }, { 0, 1, 2, 3, 2, 4, 2, 5, 2, 6, 2, 7, 8, 2, 9, 10, 2, 11, 12, 2, 13, 2, 14, 2, 15, 2, 16, 2, 17, 2, 18, 19, 2, 20, 21, 2, 22, 23, 2, 24, 25, 0, 0, 0, 0, 0, }, }, rowDisplacements: [][]int{ nil, { 0, 0, 189, 75, }, { 0, 0, 246, 1194, 362, 1258, 426, 1114, 490, 554, 618, 1355, 682, 245, 1259, 746, 1323, 810, 1162, 874, 938, 1002, 1371, 1066, }, { 0, 0, 246, 1194, 362, 1258, 426, 1114, 490, 554, 618, 1436, 682, 245, 1259, 746, 1323, 810, 1162, 874, 938, 1002, 1452, 1066, 1504, 1435, }, }, bounds: [][]int{ nil, { -1, -1, -1, -1, -1, -1, -1, -1, -1, 1, 1, -1, -1, 1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 1, -1, 1, -1, -1, -1, -1, 1, 1, 1, -1, -1, -1, -1, -1, -1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, -1, -1, -1, -1, -1, -1, -1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, -1, -1, -1, -1, 1, -1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, -1, -1, -1, -1, -1, -1, -1, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, -1, -1, -1, -1, 3, -1, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, -1, -1, 2, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 2, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, }, { 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, -1, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, -1, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, -1, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 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0, 0, 0, 0, 0, 40, 40, 40, 40, 40, 40, 44, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 18, 18, 18, 18, 18, 18, 18, 18, 18, 18, 18, 18, 18, 18, 18, 18, 37, 37, 37, 37, 37, 37, 37, 37, 37, 37, 37, 37, 37, 37, 37, 37, 44, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 41, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, }, }, originalColCounts: nil, } } func (s *lexSpec) InitialMode() ModeID { return s.initialModeID } func (s *lexSpec) Pop(mode ModeID, modeKind ModeKindID) bool { return s.pop[mode][modeKind] } func (s *lexSpec) Push(mode ModeID, modeKind ModeKindID) (ModeID, bool) { id := s.push[mode][modeKind] return id, id != s.modeIDNil } func (s *lexSpec) ModeName(mode ModeID) string { return s.modeNames[mode] } func (s *lexSpec) InitialState(mode ModeID) StateID { return s.initialStates[mode] } func (s *lexSpec) NextState(mode ModeID, state StateID, v int) (StateID, bool) { rowNum := s.rowNums[mode][state] d := s.rowDisplacements[mode][rowNum] if s.bounds[mode][d+v] != rowNum { return s.stateIDNil, false } return s.entries[mode][d+v], true } func (s *lexSpec) Accept(mode ModeID, state StateID) (ModeKindID, bool) { id := s.acceptances[mode][state] return id, id != s.modeKindIDNil } func (s *lexSpec) KindIDAndName(mode ModeID, modeKind ModeKindID) (KindID, string) { id := s.kindIDs[mode][modeKind] return id, s.kindNames[id] }