// LexBegin is the initial lexer function
func LexBegin(lexer *lex.Lexer) lex.StateFn {
lexer.AcceptWhitespace(lex.Ignore)
if strings.HasPrefix(lexer.InputToEnd(), MinusSign) {
return LexSingleLineComment
}
return LexCode
}
func lexStart(l *lex.Lexer) lex.StateFn {
l.AcceptWhitespace(lex.Ignore)
r := l.Next()
switch r {
case lex.EOF:
l.Emit(lex.TEOF)
return nil
case leftBracket:
l.Backup()
return lexLeftBracket
default:
if lex.IsAlphaNumeric(r) {
return lexKey
}
return l.Errorf("Unknown charecter: %v", string(r))
}
}