func stStart(l lex.Lexer) lex.StateFn {
char := l.PeekRune(0)
switch true {
case char == lex.RuneEOF:
l.EmitEOF()
return nil
// Read comments
case char == '-' && l.PeekRune(1) == '-':
return stComment
// Double-quote string
case char == '"' || char == '\'':
return stReadString
// Read 3char symbols
case inMapR(char, symbols_3c_1) && inMap(concatRunes(char, l.PeekRune(1), l.PeekRune(2)), symbols_3c):
l.NextRune()
l.NextRune()
l.NextRune()
emit(l, Symbol)
return stStart
// 2char symbols
case inMapR(char, symbols_2c_1) && inMap(concatRunes(char, l.PeekRune(1)), symbols_2c):
l.NextRune()
l.NextRune()
emit(l, Symbol)
return stStart
// 1char symbols
case inMapR(char, symbols_1c):
l.NextRune()
emit(l, Symbol)
return stStart
// Read a Name identifier
case inMapR(char, nameFirstChar):
return stReadName
// Read whitespace
case inMapR(char, whitespaceChars):
emit(l, Whitespace)
return stWhitespace
// Read Long strings
case longStringEquals('[', l) >= 0:
return stLongString
// Read hex numbers
case char == '0' && (unicode.ToLower(l.PeekRune(1)) == 'x'):
return stHex
// Read normal numbers
case inMapR(char, digits):
return stNumber
}
return nil
}
func stReadString(l lex.Lexer) lex.StateFn {
delim := l.NextRune()
if !(delim == '\'' || delim == '"') {
emitError("Expected `\"` or `'` to start quote-string.")
}
for {
char := l.NextRune()
switch char {
case delim:
// end of string
fmt.Println("End of the string!")
emit(l, String)
return stStart
case '\\':
l.NextRune()
case lex.RuneEOF:
l.EmitEOF()
case '\n':
l.NewLine()
}
}
return stStart
}