func stHex(l lex.Lexer) lex.StateFn {
if l.NextRune() != '0' {
emitError("Hex numbers should start with 0")
return nil
}
if unicode.ToLower(l.NextRune()) != 'x' {
emitError("Malformatted hex number (no x)")
return nil
}
baseChars := 0
for ; inMapR(l.PeekRune(0), hexdigits); baseChars++ {
l.NextRune()
}
fmt.Println("Base Chars:", baseChars)
if l.PeekRune(0) == '.' {
l.NextRune()
if !l.MatchOneOrMoreBytes(hexdigits_b) {
emitError("Malformed hex number.")
return nil
}
} else if baseChars == 0 {
emitError("Malformed hex number (no base chars or decimal).")
return nil
}
if unicode.ToLower(l.PeekRune(0)) == 'p' {
l.NextRune()
next := l.PeekRune(0)
if next == '+' || next == '-' {
l.NextRune()
}
if !l.MatchOneOrMoreBytes(digits_b) {
emitError("Malformed hex number (no digits after p)")
return nil
}
}
emit(l, HexNumber)
return stStart
}
func stNumber(l lex.Lexer) lex.StateFn {
if !l.MatchOneOrMoreBytes(digits_b) {
emitError("Malformatted number: no principle number.")
}
if l.MatchOneRune('.') {
if !l.MatchOneOrMoreBytes(digits_b) {
emitError("Malformatted number: no fractional part in float.")
}
}
if l.MatchOneRunes([]rune{'e', 'E'}) {
l.MatchZeroOrOneRunes([]rune{'-', '+'})
if !l.MatchOneOrMoreBytes(digits_b) {
emitError("Malformatted number: no exponential part in float.")
}
}
emit(l, Number)
return stStart
}