diff options
Diffstat (limited to 'src/urubu/spec/grammar/parser.go')
-rw-r--r-- | src/urubu/spec/grammar/parser.go | 2248 |
1 files changed, 2248 insertions, 0 deletions
diff --git a/src/urubu/spec/grammar/parser.go b/src/urubu/spec/grammar/parser.go new file mode 100644 index 0000000..0e5a16b --- /dev/null +++ b/src/urubu/spec/grammar/parser.go @@ -0,0 +1,2248 @@ +//go:generate maleeni compile lexspec.json -o clexspec.json +//go:generate maleeni-go clexspec.json --package parser + +package parser + +import ( + _ "embed" + "fmt" + "io" + "io/ioutil" + "regexp" + "strings" + + verr "urubu/error" + spec "urubu/spec/grammar" +) + +type tokenKind string + +const ( + tokenKindKWFragment = tokenKind("fragment") + tokenKindID = tokenKind("id") + tokenKindTerminalPattern = tokenKind("terminal pattern") + tokenKindStringLiteral = tokenKind("string") + tokenKindColon = tokenKind(":") + tokenKindOr = tokenKind("|") + tokenKindSemicolon = tokenKind(";") + tokenKindLabelMarker = tokenKind("@") + tokenKindDirectiveMarker = tokenKind("#") + tokenKindExpantion = tokenKind("...") + tokenKindOrderedSymbolMarker = tokenKind("$") + tokenKindLParen = tokenKind("(") + tokenKindRParen = tokenKind(")") + tokenKindNewline = tokenKind("newline") + tokenKindEOF = tokenKind("eof") + tokenKindInvalid = tokenKind("invalid") +) + +var ( + reIDChar = regexp.MustCompile(`^[0-9a-z_]+$`) + reIDInvalidDigitsPos = regexp.MustCompile(`^[0-9]`) +) + +type Position struct { + Row int + Col int +} + +func newPosition(row, col int) Position { + return Position{ + Row: row, + Col: col, + } +} + +type token struct { + kind tokenKind + text string + pos Position +} + +func newSymbolToken(kind tokenKind, pos Position) *token { + return &token{ + kind: kind, + pos: pos, + } +} + +func newIDToken(text string, pos Position) *token { + return &token{ + kind: tokenKindID, + text: text, + pos: pos, + } +} + +func newTerminalPatternToken(text string, pos Position) *token { + return &token{ + kind: tokenKindTerminalPattern, + text: text, + pos: pos, + } +} + +func newStringLiteralToken(text string, pos Position) *token { + return &token{ + kind: tokenKindStringLiteral, + text: text, + pos: pos, + } +} + +func newEOFToken() *token { + return &token{ + kind: tokenKindEOF, + } +} + +func newInvalidToken(text string, pos Position) *token { + return &token{ + kind: tokenKindInvalid, + text: text, + pos: pos, + } +} + +type lexer struct { + d *Lexer + buf *token +} + +func newLexer(src io.Reader) (*lexer, error) { + d, err := NewLexer(NewLexSpec(), src) + if err != nil { + return nil, err + } + return &lexer{ + d: d, + }, nil +} + +func (l *lexer) next() (*token, error) { + if l.buf != nil { + tok := l.buf + l.buf = nil + return tok, nil + } + + var newline *token + for { + tok, err := l.lexAndSkipWSs() + if err != nil { + return nil, err + } + if tok.kind == tokenKindNewline { + newline = tok + continue + } + + if newline != nil { + l.buf = tok + return newline, nil + } + return tok, nil + } +} + +func (l *lexer) lexAndSkipWSs() (*token, error) { + var tok *Token + for { + var err error + tok, err = l.d.Next() + if err != nil { + return nil, err + } + if tok.Invalid { + return newInvalidToken(string(tok.Lexeme), newPosition(tok.Row+1, tok.Col+1)), nil + } + if tok.EOF { + return newEOFToken(), nil + } + switch tok.KindID { + case KindIDWhiteSpace: + continue + case KindIDLineComment: + continue + } + + break + } + + switch tok.KindID { + case KindIDNewline: + return newSymbolToken(tokenKindNewline, newPosition(tok.Row+1, tok.Col+1)), nil + case KindIDKwFragment: + return newSymbolToken(tokenKindKWFragment, newPosition(tok.Row+1, tok.Col+1)), nil + case KindIDIdentifier: + if !reIDChar.Match(tok.Lexeme) { + return nil, &verr.SpecError{ + Cause: synErrIDInvalidChar, + Detail: string(tok.Lexeme), + Row: tok.Row + 1, + Col: tok.Col + 1, + } + } + if strings.HasPrefix(string(tok.Lexeme), "_") || strings.HasSuffix(string(tok.Lexeme), "_") { + return nil, &verr.SpecError{ + Cause: synErrIDInvalidUnderscorePos, + Detail: string(tok.Lexeme), + Row: tok.Row + 1, + Col: tok.Col + 1, + } + } + if strings.Contains(string(tok.Lexeme), "__") { + return nil, &verr.SpecError{ + Cause: synErrIDConsecutiveUnderscores, + Detail: string(tok.Lexeme), + Row: tok.Row + 1, + Col: tok.Col + 1, + } + } + if reIDInvalidDigitsPos.Match(tok.Lexeme) { + return nil, &verr.SpecError{ + Cause: synErrIDInvalidDigitsPos, + Detail: string(tok.Lexeme), + Row: tok.Row + 1, + Col: tok.Col + 1, + } + } + return newIDToken(string(tok.Lexeme), newPosition(tok.Row+1, tok.Col+1)), nil + case KindIDTerminalOpen: + var b strings.Builder + for { + tok, err := l.d.Next() + if err != nil { + return nil, err + } + if tok.EOF { + return nil, &verr.SpecError{ + Cause: synErrUnclosedTerminal, + Row: tok.Row + 1, + Col: tok.Col + 1, + } + } + switch tok.KindID { + case KindIDPattern: + // The escape sequences in a pattern string are interpreted by the lexer, except for the \". + // We must interpret the \" before passing them to the lexer because they are delimiters for + // the pattern strings. + fmt.Fprint(&b, strings.ReplaceAll(string(tok.Lexeme), `\"`, `"`)) + case KindIDEscapeSymbol: + return nil, &verr.SpecError{ + Cause: synErrIncompletedEscSeq, + Row: tok.Row + 1, + Col: tok.Col + 1, + } + case KindIDTerminalClose: + pat := b.String() + if pat == "" { + return nil, &verr.SpecError{ + Cause: synErrEmptyPattern, + Row: tok.Row + 1, + Col: tok.Col + 1, + } + } + return newTerminalPatternToken(pat, newPosition(tok.Row+1, tok.Col+1)), nil + } + } + case KindIDStringLiteralOpen: + var b strings.Builder + for { + tok, err := l.d.Next() + if err != nil { + return nil, err + } + if tok.EOF { + return nil, &verr.SpecError{ + Cause: synErrUnclosedString, + Row: tok.Row + 1, + Col: tok.Col + 1, + } + } + switch tok.KindID { + case KindIDCharSeq: + fmt.Fprint(&b, string(tok.Lexeme)) + case KindIDStringLiteralClose: + str := b.String() + if str == "" { + return nil, &verr.SpecError{ + Cause: synErrEmptyString, + Row: tok.Row + 1, + Col: tok.Col + 1, + } + } + return newStringLiteralToken(str, newPosition(tok.Row+1, tok.Col+1)), nil + } + } + case KindIDColon: + return newSymbolToken(tokenKindColon, newPosition(tok.Row+1, tok.Col+1)), nil + case KindIDOr: + return newSymbolToken(tokenKindOr, newPosition(tok.Row+1, tok.Col+1)), nil + case KindIDSemicolon: + return newSymbolToken(tokenKindSemicolon, newPosition(tok.Row+1, tok.Col+1)), nil + case KindIDLabelMarker: + return newSymbolToken(tokenKindLabelMarker, newPosition(tok.Row+1, tok.Col+1)), nil + case KindIDDirectiveMarker: + return newSymbolToken(tokenKindDirectiveMarker, newPosition(tok.Row+1, tok.Col+1)), nil + case KindIDExpansion: + return newSymbolToken(tokenKindExpantion, newPosition(tok.Row+1, tok.Col+1)), nil + case KindIDOrderedSymbolMarker: + return newSymbolToken(tokenKindOrderedSymbolMarker, newPosition(tok.Row+1, tok.Col+1)), nil + case KindIDLParen: + return newSymbolToken(tokenKindLParen, newPosition(tok.Row+1, tok.Col+1)), nil + case KindIDRParen: + return newSymbolToken(tokenKindRParen, newPosition(tok.Row+1, tok.Col+1)), nil + default: + return newInvalidToken(string(tok.Lexeme), newPosition(tok.Row+1, tok.Col+1)), nil + } +} + +type RootNode struct { + Directives []*DirectiveNode + Productions []*ProductionNode + LexProductions []*ProductionNode + Fragments []*FragmentNode +} + +type ProductionNode struct { + Directives []*DirectiveNode + LHS string + RHS []*AlternativeNode + Pos Position +} + +func (n *ProductionNode) isLexical() bool { + if len(n.RHS) == 1 && len(n.RHS[0].Elements) == 1 && n.RHS[0].Elements[0].Pattern != "" { + return true + } + return false +} + +type AlternativeNode struct { + Elements []*ElementNode + Directives []*DirectiveNode + Pos Position +} + +type ElementNode struct { + ID string + Pattern string + Label *LabelNode + Literally bool + Pos Position +} + +type LabelNode struct { + Name string + Pos Position +} + +type DirectiveNode struct { + Name string + Parameters []*ParameterNode + Pos Position +} + +type ParameterNode struct { + ID string + Pattern string + String string + OrderedSymbol string + Group []*DirectiveNode + Expansion bool + Pos Position +} + +type FragmentNode struct { + LHS string + RHS string + Pos Position +} + +func raiseSyntaxError(row int, synErr *SyntaxError) { + panic(&verr.SpecError{ + Cause: synErr, + Row: row, + }) +} + +func raiseSyntaxErrorWithDetail(row int, synErr *SyntaxError, detail string) { + panic(&verr.SpecError{ + Cause: synErr, + Detail: detail, + Row: row, + }) +} + +func Parse(src io.Reader) (*RootNode, error) { + p, err := newParser(src) + if err != nil { + return nil, err + } + + return p.parse() +} + +type parser struct { + lex *lexer + peekedTok *token + lastTok *token + errs verr.SpecErrors + + // A token position that the parser read at last. + // It is used as additional information in error messages. + pos Position +} + +func newParser(src io.Reader) (*parser, error) { + lex, err := newLexer(src) + if err != nil { + return nil, err + } + return &parser{ + lex: lex, + }, nil +} + +func (p *parser) parse() (root *RootNode, retErr error) { + root = p.parseRoot() + if len(p.errs) > 0 { + return nil, p.errs + } + + return root, nil +} + +func (p *parser) parseRoot() *RootNode { + defer func() { + err := recover() + if err != nil { + specErr, ok := err.(*verr.SpecError) + if !ok { + panic(fmt.Errorf("an unexpected error occurred: %v", err)) + } + p.errs = append(p.errs, specErr) + } + }() + + var dirs []*DirectiveNode + var prods []*ProductionNode + var lexProds []*ProductionNode + var fragments []*FragmentNode + for { + dir := p.parseTopLevelDirective() + if dir != nil { + dirs = append(dirs, dir) + continue + } + + fragment := p.parseFragment() + if fragment != nil { + fragments = append(fragments, fragment) + continue + } + + prod := p.parseProduction() + if prod != nil { + if prod.isLexical() { + lexProds = append(lexProds, prod) + } else { + prods = append(prods, prod) + } + continue + } + + if p.consume(tokenKindEOF) { + break + } + } + + return &RootNode{ + Directives: dirs, + Productions: prods, + LexProductions: lexProds, + Fragments: fragments, + } +} + +func (p *parser) parseTopLevelDirective() *DirectiveNode { + defer func() { + err := recover() + if err == nil { + return + } + + specErr, ok := err.(*verr.SpecError) + if !ok { + panic(err) + } + + p.errs = append(p.errs, specErr) + p.skipOverTo(tokenKindSemicolon) + }() + + dir := p.parseDirective() + if dir == nil { + return nil + } + + p.consume(tokenKindNewline) + + if !p.consume(tokenKindSemicolon) { + raiseSyntaxError(p.pos.Row, synErrTopLevelDirNoSemicolon) + } + + return dir +} + +func (p *parser) parseFragment() *FragmentNode { + defer func() { + err := recover() + if err == nil { + return + } + + specErr, ok := err.(*verr.SpecError) + if !ok { + panic(err) + } + + p.errs = append(p.errs, specErr) + p.skipOverTo(tokenKindSemicolon) + }() + + p.consume(tokenKindNewline) + + if !p.consume(tokenKindKWFragment) { + return nil + } + + p.consume(tokenKindNewline) + + if !p.consume(tokenKindID) { + raiseSyntaxError(p.pos.Row, synErrNoProductionName) + } + lhs := p.lastTok.text + lhsPos := p.lastTok.pos + + p.consume(tokenKindNewline) + + if !p.consume(tokenKindColon) { + raiseSyntaxError(p.pos.Row, synErrNoColon) + } + + var rhs string + switch { + case p.consume(tokenKindTerminalPattern): + rhs = p.lastTok.text + case p.consume(tokenKindStringLiteral): + rhs = spec.EscapePattern(p.lastTok.text) + default: + raiseSyntaxError(p.pos.Row, synErrFragmentNoPattern) + } + + p.consume(tokenKindNewline) + + if !p.consume(tokenKindSemicolon) { + raiseSyntaxError(p.pos.Row, synErrNoSemicolon) + } + + if !p.consume(tokenKindNewline) { + if !p.consume(tokenKindEOF) { + raiseSyntaxError(p.pos.Row, synErrSemicolonNoNewline) + } + } + + return &FragmentNode{ + LHS: lhs, + RHS: rhs, + Pos: lhsPos, + } +} + +func (p *parser) parseProduction() *ProductionNode { + defer func() { + err := recover() + if err == nil { + return + } + + specErr, ok := err.(*verr.SpecError) + if !ok { + panic(err) + } + + p.errs = append(p.errs, specErr) + p.skipOverTo(tokenKindSemicolon) + }() + + p.consume(tokenKindNewline) + + if p.consume(tokenKindEOF) { + return nil + } + + if !p.consume(tokenKindID) { + raiseSyntaxError(p.pos.Row, synErrNoProductionName) + } + lhs := p.lastTok.text + lhsPos := p.lastTok.pos + + var dirs []*DirectiveNode + for { + dir := p.parseDirective() + if dir == nil { + break + } + dirs = append(dirs, dir) + } + + p.consume(tokenKindNewline) + + if !p.consume(tokenKindColon) { + raiseSyntaxError(p.pos.Row, synErrNoColon) + } + + alt := p.parseAlternative() + rhs := []*AlternativeNode{alt} + for { + p.consume(tokenKindNewline) + + if !p.consume(tokenKindOr) { + break + } + alt := p.parseAlternative() + rhs = append(rhs, alt) + } + + p.consume(tokenKindNewline) + + if !p.consume(tokenKindSemicolon) { + raiseSyntaxError(p.pos.Row, synErrNoSemicolon) + } + + if !p.consume(tokenKindNewline) { + if !p.consume(tokenKindEOF) { + raiseSyntaxError(p.pos.Row, synErrSemicolonNoNewline) + } + } + + prod := &ProductionNode{ + Directives: dirs, + LHS: lhs, + RHS: rhs, + Pos: lhsPos, + } + + // Vartan's driver must provide a user with the names of expected tokens when a syntax error occurs. + // However, if a pattern appears directly in an alternative, Vartan's compiler cannot assign an appropriate + // name to the pattern. Therefore, this code prohibits alternatives from containing patterns. + if !prod.isLexical() { + for _, alt := range prod.RHS { + for _, elem := range alt.Elements { + if elem.Pattern != "" { + raiseSyntaxError(elem.Pos.Row, synErrPatternInAlt) + } + } + } + } + + return prod +} + +func (p *parser) parseAlternative() *AlternativeNode { + elems := []*ElementNode{} + for { + elem := p.parseElement() + if elem == nil { + break + } + elems = append(elems, elem) + } + + // When a length of an alternative is zero, we cannot set a position. + var firstElemPos Position + if len(elems) > 0 { + firstElemPos = elems[0].Pos + } + + var dirs []*DirectiveNode + for { + dir := p.parseDirective() + if dir == nil { + break + } + dirs = append(dirs, dir) + } + + return &AlternativeNode{ + Elements: elems, + Directives: dirs, + Pos: firstElemPos, + } +} + +func (p *parser) parseElement() *ElementNode { + var elem *ElementNode + switch { + case p.consume(tokenKindID): + elem = &ElementNode{ + ID: p.lastTok.text, + Pos: p.lastTok.pos, + } + case p.consume(tokenKindTerminalPattern): + elem = &ElementNode{ + Pattern: p.lastTok.text, + Pos: p.lastTok.pos, + } + case p.consume(tokenKindStringLiteral): + elem = &ElementNode{ + Pattern: p.lastTok.text, + Literally: true, + Pos: p.lastTok.pos, + } + default: + if p.consume(tokenKindLabelMarker) { + raiseSyntaxError(p.pos.Row, synErrLabelWithNoSymbol) + } + return nil + } + if p.consume(tokenKindLabelMarker) { + if !p.consume(tokenKindID) { + raiseSyntaxError(p.pos.Row, synErrNoLabel) + } + elem.Label = &LabelNode{ + Name: p.lastTok.text, + Pos: p.lastTok.pos, + } + } + return elem +} + +func (p *parser) parseDirective() *DirectiveNode { + p.consume(tokenKindNewline) + + if !p.consume(tokenKindDirectiveMarker) { + return nil + } + dirPos := p.lastTok.pos + + if !p.consume(tokenKindID) { + raiseSyntaxError(p.pos.Row, synErrNoDirectiveName) + } + name := p.lastTok.text + + var params []*ParameterNode + for { + param := p.parseParameter() + if param == nil { + break + } + params = append(params, param) + } + + return &DirectiveNode{ + Name: name, + Parameters: params, + Pos: dirPos, + } +} + +func (p *parser) parseParameter() *ParameterNode { + var param *ParameterNode + switch { + case p.consume(tokenKindID): + param = &ParameterNode{ + ID: p.lastTok.text, + Pos: p.lastTok.pos, + } + case p.consume(tokenKindTerminalPattern): + param = &ParameterNode{ + Pattern: p.lastTok.text, + Pos: p.lastTok.pos, + } + case p.consume(tokenKindStringLiteral): + param = &ParameterNode{ + String: p.lastTok.text, + Pos: p.lastTok.pos, + } + case p.consume(tokenKindOrderedSymbolMarker): + if !p.consume(tokenKindID) { + raiseSyntaxError(p.pos.Row, synErrNoOrderedSymbolName) + } + param = &ParameterNode{ + OrderedSymbol: p.lastTok.text, + Pos: p.lastTok.pos, + } + case p.consume(tokenKindLParen): + pos := p.lastTok.pos + var g []*DirectiveNode + for { + dir := p.parseDirective() + if dir == nil { + break + } + g = append(g, dir) + } + if !p.consume(tokenKindRParen) { + raiseSyntaxError(p.pos.Row, synErrUnclosedDirGroup) + } + if len(g) == 0 { + // Set an empty slice representing an empty directive group to distinguish between the following two cases. + // + // - #prec (); // vartan allows this case. + // - #prec; // This case will raise an error. + g = []*DirectiveNode{} + } + param = &ParameterNode{ + Group: g, + Pos: pos, + } + } + if p.consume(tokenKindExpantion) { + switch { + case param == nil: + raiseSyntaxError(p.pos.Row, synErrStrayExpOp) + case param.ID == "": + raiseSyntaxError(p.pos.Row, synErrInvalidExpOperand) + } + param.Expansion = true + } + return param +} + +func (p *parser) consume(expected tokenKind) bool { + var tok *token + var err error + if p.peekedTok != nil { + tok = p.peekedTok + p.peekedTok = nil + } else { + tok, err = p.lex.next() + if err != nil { + panic(err) + } + } + p.pos = tok.pos + if tok.kind == tokenKindInvalid { + raiseSyntaxErrorWithDetail(p.pos.Row, synErrInvalidToken, tok.text) + } + if tok.kind == expected { + p.lastTok = tok + return true + } + p.peekedTok = tok + + return false +} + +func (p *parser) skip() { + var tok *token + var err error + for { + if p.peekedTok != nil { + tok = p.peekedTok + p.peekedTok = nil + } else { + tok, err = p.lex.next() + if err != nil { + p.errs = append(p.errs, &verr.SpecError{ + Cause: err, + Row: p.pos.Row, + }) + continue + } + } + + break + } + + p.lastTok = tok + p.pos = tok.pos +} + +func (p *parser) skipOverTo(kind tokenKind) { + for { + if p.consume(kind) || p.consume(tokenKindEOF) { + return + } + p.skip() + } +} + +type SyntaxError struct { + message string +} + +func newSyntaxError(message string) *SyntaxError { + return &SyntaxError{ + message: message, + } +} + +func (e *SyntaxError) Error() string { + return e.message +} + +var ( + // lexical errors + synErrIDInvalidChar = newSyntaxError("an identifier can contain only the lower-case letter, the digits, and the underscore") + synErrIDInvalidUnderscorePos = newSyntaxError("the underscore cannot be placed at the beginning or end of an identifier") + synErrIDConsecutiveUnderscores = newSyntaxError("the underscore cannot be placed consecutively") + synErrIDInvalidDigitsPos = newSyntaxError("the digits cannot be placed at the biginning of an identifier") + synErrUnclosedTerminal = newSyntaxError("unclosed terminal") + synErrUnclosedString = newSyntaxError("unclosed string") + synErrIncompletedEscSeq = newSyntaxError("incompleted escape sequence; unexpected EOF following a backslash") + synErrEmptyPattern = newSyntaxError("a pattern must include at least one character") + synErrEmptyString = newSyntaxError("a string must include at least one character") + + // syntax errors + synErrInvalidToken = newSyntaxError("invalid token") + synErrTopLevelDirNoSemicolon = newSyntaxError("a top-level directive must be followed by ;") + synErrNoProductionName = newSyntaxError("a production name is missing") + synErrNoColon = newSyntaxError("the colon must precede alternatives") + synErrNoSemicolon = newSyntaxError("the semicolon is missing at the last of an alternative") + synErrLabelWithNoSymbol = newSyntaxError("a label must follow a symbol") + synErrNoLabel = newSyntaxError("an identifier that represents a label is missing after the label marker @") + synErrNoDirectiveName = newSyntaxError("a directive needs a name") + synErrNoOrderedSymbolName = newSyntaxError("an ordered symbol name is missing") + synErrUnclosedDirGroup = newSyntaxError("a directive group must be closed by )") + synErrPatternInAlt = newSyntaxError("a pattern literal cannot appear directly in an alternative. instead, please define a terminal symbol with the pattern literal") + synErrStrayExpOp = newSyntaxError("an expansion operator ... must be preceded by an identifier") + synErrInvalidExpOperand = newSyntaxError("an expansion operator ... can be applied to only an identifier") + synErrSemicolonNoNewline = newSyntaxError("a semicolon must be followed by a newline") + synErrFragmentNoPattern = newSyntaxError("a fragment needs one pattern element") +) +// Code generated by maleeni-go. DO NOT EDIT. + +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 + ModeIDTerminal ModeID = 2 + ModeIDStringLiteral ModeID = 3 +) + +const ( + ModeNameNil = "" + ModeNameDefault = "default" + ModeNameTerminal = "terminal" + ModeNameStringLiteral = "string_literal" +) + +// ModeIDToName converts a mode ID to a name. +func ModeIDToName(id ModeID) string { + switch id { + case ModeIDNil: + return ModeNameNil + case ModeIDDefault: + return ModeNameDefault + case ModeIDTerminal: + return ModeNameTerminal + case ModeIDStringLiteral: + return ModeNameStringLiteral + } + return "" +} + +const ( + KindIDNil KindID = 0 + KindIDWhiteSpace KindID = 1 + KindIDNewline KindID = 2 + KindIDLineComment KindID = 3 + KindIDKwFragment KindID = 4 + KindIDIdentifier KindID = 5 + KindIDTerminalOpen KindID = 6 + KindIDStringLiteralOpen KindID = 7 + KindIDColon KindID = 8 + KindIDOr KindID = 9 + KindIDSemicolon KindID = 10 + KindIDLabelMarker KindID = 11 + KindIDExpansion KindID = 12 + KindIDDirectiveMarker KindID = 13 + KindIDOrderedSymbolMarker KindID = 14 + KindIDLParen KindID = 15 + KindIDRParen KindID = 16 + KindIDPattern KindID = 17 + KindIDEscapeSymbol KindID = 18 + KindIDTerminalClose KindID = 19 + KindIDCharSeq KindID = 20 + KindIDStringLiteralClose KindID = 21 +) + +const ( + KindNameNil = "" + KindNameWhiteSpace = "white_space" + KindNameNewline = "newline" + KindNameLineComment = "line_comment" + KindNameKwFragment = "kw_fragment" + KindNameIdentifier = "identifier" + KindNameTerminalOpen = "terminal_open" + KindNameStringLiteralOpen = "string_literal_open" + KindNameColon = "colon" + KindNameOr = "or" + KindNameSemicolon = "semicolon" + KindNameLabelMarker = "label_marker" + KindNameExpansion = "expansion" + KindNameDirectiveMarker = "directive_marker" + KindNameOrderedSymbolMarker = "ordered_symbol_marker" + KindNameLParen = "l_paren" + KindNameRParen = "r_paren" + KindNamePattern = "pattern" + KindNameEscapeSymbol = "escape_symbol" + KindNameTerminalClose = "terminal_close" + KindNameCharSeq = "char_seq" + KindNameStringLiteralClose = "string_literal_close" +) + +// KindIDToName converts a kind ID to a name. +func KindIDToName(id KindID) string { + switch id { + case KindIDNil: + return KindNameNil + case KindIDWhiteSpace: + return KindNameWhiteSpace + case KindIDNewline: + return KindNameNewline + case KindIDLineComment: + return KindNameLineComment + case KindIDKwFragment: + return KindNameKwFragment + case KindIDIdentifier: + return KindNameIdentifier + case KindIDTerminalOpen: + return KindNameTerminalOpen + case KindIDStringLiteralOpen: + return KindNameStringLiteralOpen + case KindIDColon: + return KindNameColon + case KindIDOr: + return KindNameOr + case KindIDSemicolon: + return KindNameSemicolon + case KindIDLabelMarker: + return KindNameLabelMarker + case KindIDExpansion: + return KindNameExpansion + case KindIDDirectiveMarker: + return KindNameDirectiveMarker + case KindIDOrderedSymbolMarker: + return KindNameOrderedSymbolMarker + case KindIDLParen: + return KindNameLParen + case KindIDRParen: + return KindNameRParen + case KindIDPattern: + return KindNamePattern + case KindIDEscapeSymbol: + return KindNameEscapeSymbol + case KindIDTerminalClose: + return KindNameTerminalClose + case KindIDCharSeq: + return KindNameCharSeq + case KindIDStringLiteralClose: + return KindNameStringLiteralClose + } + 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, false, false, false, false, false, false, false, false, + }, + { + false, false, false, true, + }, + { + false, false, true, + }, + }, + push: [][]ModeID{ + nil, + { + 0, 0, 0, 0, 0, 0, 2, 3, 0, 0, 0, 0, 0, 0, 0, 0, 0, + }, + { + 0, 0, 0, 0, + }, + { + 0, 0, 0, + }, + }, + modeNames: []string{ + ModeNameNil, + ModeNameDefault, + ModeNameTerminal, + ModeNameStringLiteral, + }, + initialStates: []StateID{ + 0, + 1, + 1, + 1, + }, + acceptances: [][]ModeKindID{ + nil, + { + 0, 0, 1, 2, 0, 3, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, + 0, 0, 0, 0, 5, 5, 5, 5, 5, 5, 5, 4, 5, 0, 0, 2, 6, 7, 8, 9, + 10, 11, 12, 13, 14, 15, 16, + }, + { + 0, 0, 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, 1, + 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, 3, + }, + { + 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, + }, + }, + kindIDs: [][]KindID{ + nil, + { + KindIDNil, + KindIDWhiteSpace, + KindIDNewline, + KindIDLineComment, + KindIDKwFragment, + KindIDIdentifier, + KindIDTerminalOpen, + KindIDStringLiteralOpen, + KindIDColon, + KindIDOr, + KindIDSemicolon, + KindIDLabelMarker, + KindIDExpansion, + KindIDDirectiveMarker, + KindIDOrderedSymbolMarker, + KindIDLParen, + KindIDRParen, + }, + { + KindIDNil, + KindIDPattern, + KindIDEscapeSymbol, + KindIDTerminalClose, + }, + { + KindIDNil, + KindIDCharSeq, + KindIDStringLiteralClose, + }, + }, + kindNames: []string{ + KindNameNil, + KindNameWhiteSpace, + KindNameNewline, + KindNameLineComment, + KindNameKwFragment, + KindNameIdentifier, + KindNameTerminalOpen, + KindNameStringLiteralOpen, + KindNameColon, + KindNameOr, + KindNameSemicolon, + KindNameLabelMarker, + KindNameExpansion, + KindNameDirectiveMarker, + KindNameOrderedSymbolMarker, + KindNameLParen, + KindNameRParen, + KindNamePattern, + KindNameEscapeSymbol, + KindNameTerminalClose, + KindNameCharSeq, + KindNameStringLiteralClose, + }, + initialModeID: ModeIDDefault, + modeIDNil: ModeIDNil, + modeKindIDNil: 0, + stateIDNil: 0, + + rowNums: [][]int{ + nil, + { + 0, 1, 2, 3, 4, 5, 6, 7, 6, 8, 6, 9, 6, 10, 6, 11, 12, 6, 13, 14, + 6, 15, 16, 6, 17, 18, 19, 20, 21, 22, 23, 24, 24, 25, 26, 0, 0, 0, 0, 0, + 0, 0, 0, 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, 24, + 2, 25, 2, 26, 2, 27, 2, 28, 2, 29, 30, 2, 31, 32, 2, 33, 34, 2, 35, 2, + 36, 2, 37, 2, 38, 2, 39, 2, 40, 41, 2, 42, 43, 2, 44, 45, 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, 0, + }, + }, + rowDisplacements: [][]int{ + nil, + { + 0, 236, 1554, 1555, 1556, 0, 237, 1323, 301, 1387, 365, 1291, 429, 493, 557, 1419, 621, 765, 840, 915, + 990, 1065, 1140, 1215, 1290, 1558, 1559, + }, + { + 0, 0, 736, 2548, 852, 2612, 916, 2372, 980, 1044, 1108, 2839, 1172, 245, 2613, 1236, 2677, 1300, 2420, 1364, + 1428, 1492, 2855, 1556, 735, 2678, 1620, 2742, 1684, 2468, 1748, 1812, 1876, 2871, 1940, 490, 2743, 2004, 2807, 2068, + 2516, 2132, 2196, 2260, 2887, 2324, + }, + { + 0, 0, 246, 1194, 362, 1258, 426, 1114, 490, 554, 618, 1355, 682, 245, 1259, 746, 1323, 810, 1162, 874, + 938, 1002, 1371, 1066, + }, + }, + bounds: [][]int{ + nil, + { + 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, -1, 5, 5, -1, 5, 5, 5, 5, 5, 5, + 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, + 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, + 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, + 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, + 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, + 5, 5, 5, 5, 5, 5, 5, 5, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, + -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, + -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, + -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 5, 5, 5, 5, 5, 5, + 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, + 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, + 5, 5, 5, 5, 5, 1, 1, -1, -1, 1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, + -1, -1, -1, -1, -1, -1, -1, -1, 1, -1, 1, 1, 1, -1, -1, 1, 1, 1, -1, -1, + -1, -1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, -1, -1, -1, -1, + 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, + 1, 1, 1, 1, 1, 1, 1, -1, -1, -1, -1, 1, -1, 1, 1, 1, 1, 1, 1, 1, + 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, -1, + 1, -1, -1, -1, -1, 6, 6, 6, 6, 6, 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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] +} |