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
}
