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|
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) 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
}
|
