diff options
Diffstat (limited to 'src/urubu/spec/test/tree_lexer.go')
-rw-r--r-- | src/urubu/spec/test/tree_lexer.go | 1024 |
1 files changed, 1024 insertions, 0 deletions
diff --git a/src/urubu/spec/test/tree_lexer.go b/src/urubu/spec/test/tree_lexer.go new file mode 100644 index 0000000..8bb1c87 --- /dev/null +++ b/src/urubu/spec/test/tree_lexer.go @@ -0,0 +1,1024 @@ +// Code generated by vartan-go. DO NOT EDIT. +package test + +import ( + "fmt" + "io" +) + +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 := io.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, + 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, + 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, + 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, + 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 6, 6, 6, 6, 6, 6, + 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, + 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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] +} |