diff options
Diffstat (limited to 'lexer.go')
| -rw-r--r-- | lexer.go | 13 |
1 files changed, 12 insertions, 1 deletions
@@ -16,6 +16,7 @@ type Lexer struct { Pos int // Pos at input string. Output chan Lexem // Lexems channel. width int // Width of last rune. + states stateStack // Stack of states to realize PrevState. } // New returns new scanner for input string. @@ -37,6 +38,16 @@ func (l *Lexer) Run(init StateFunc) { close(l.Output) } +// PopState returns previous state function. +func (l *Lexer) PopState() StateFunc { + return l.states.Pop() +} + +// PushState pushes state before going deeper states. +func (l *Lexer) PushState(s StateFunc) { + l.states.Push(s) +} + // Emit current lexem to output. func (l *Lexer) Emit(typ LexType) { l.Output <- Lexem{ @@ -51,7 +62,7 @@ func (l *Lexer) Emit(typ LexType) { // Errorf produces error lexem and stops scanning. func (l *Lexer) Errorf(format string, args ...interface{}) StateFunc { l.Output <- Lexem{ - Type: LError, + Type: LexError, Value: fmt.Sprintf(format, args...), Start: l.Start, End: l.Pos, |