static NFA::CharSet parseLit(const char*& nextChar)
{
NFA::CharSet result;
const char c = parseChar<inSet>(nextChar);
if(inSet && *nextChar == '-')
{
++nextChar;
const char d = parseChar<inSet>(nextChar);
result.addRange((U8)c,(U8)d);
}
else { result.add((U8)c); }
return result;
}
static NFA::CharSet parseCharClass(const char*& nextChar)
{
if(*nextChar != '\\') { return parseLit<inSet>(nextChar); }
else
{
NFA::CharSet result;
switch(nextChar[1])
{
case 'd': result.addRange('0','9'); break;
case 'w': result.addRange('a','z'); result.addRange('A','Z'); result.addRange('0','9'); result.add('_'); break;
case 's': result.add(' '); result.add('\t'); result.add('\f'); result.add('\r'); result.add('\n'); break;
default:
if(!isMetachar<inSet>(nextChar[1]))
{
Errors::fatalf("'%c' is not a metachar in this context",nextChar[1]);
}
result.add(nextChar[1]);
break;
};
nextChar += 2;
return result;
}
}