package parser import ( "io" "github.com/nihei9/vartan/driver/lexer" spec "github.com/nihei9/vartan/spec/grammar" ) type vToken struct { terminalID int tok *lexer.Token } func (t *vToken) TerminalID() int { return t.terminalID } func (t *vToken) Lexeme() []byte { return t.tok.Lexeme } func (t *vToken) EOF() bool { return t.tok.EOF } func (t *vToken) Invalid() bool { return t.tok.Invalid } func (t *vToken) BytePosition() (int, int) { return t.tok.BytePos, t.tok.ByteLen } func (t *vToken) Position() (int, int) { return t.tok.Row, t.tok.Col } type tokenStream struct { lex *lexer.Lexer kindToTerminal []int } func NewTokenStream(g *spec.CompiledGrammar, src io.Reader) (TokenStream, error) { lex, err := lexer.NewLexer(lexer.NewLexSpec(g.Lexical), src) if err != nil { return nil, err } return &tokenStream{ lex: lex, kindToTerminal: g.Syntactic.KindToTerminal, }, nil } func (l *tokenStream) Next() (VToken, error) { tok, err := l.lex.Next() if err != nil { return nil, err } return &vToken{ terminalID: l.kindToTerminal[tok.KindID], tok: tok, }, nil }