static inline bool strint(const char *s, int &result) {
try {
result = eval_integer(s);
return true;
} catch(const char*) {
result = 0;
return false;
}
}
int xkas::eval(const char *&s, int depth) {
if(!*s) throw "nall::bad_eval";
while(*s == ' ' || *s == '\t') s++; //trim whitespace
int value = 0, x = *s, y = *(s + 1);
if(*s == '(') {
value = eval(++s, 1);
if(*s++ != ')') throw "nall::bad_eval";
}
else if(x == '!') value = !eval(++s, 14);
else if(x == '~') value = ~eval(++s, 14);
else if(x == '+') value = +eval(++s, 14);
else if(x == '-') value = -eval(++s, 14);
else if(x == '$' || x == '%' || x == '\'' || x == '.' || x == '_'
|| (x >= 'A' && x <= 'Z') || (x >= 'a' && x <= 'z') || (x >= '0' && x <= '9')
) value = eval_integer(s);
else throw "nall::bad_eval";
for(;;) {
while(*s == ' ' || *s == '\t') s++; //trim whitespace
if(!*s) break;
x = *s, y = *(s + 1);
if(depth >= 13) break;
if(x == '*') { value *= eval(++s, 13); continue; }
if(x == '/') { value /= eval(++s, 13); continue; }
if(x == '%') { value %= eval(++s, 13); continue; }
if(depth >= 12) break;
if(x == '+') { value += eval(++s, 12); continue; }
if(x == '-') { value -= eval(++s, 12); continue; }
if(depth >= 11) break;
if(x == '<' && y == '<') { value <<= eval(++++s, 11); continue; }
if(x == '>' && y == '>') { value >>= eval(++++s, 11); continue; }
if(depth >= 10) break;
if(x == '<' && y == '=') { value = value <= eval(++++s, 10); continue; }
if(x == '>' && y == '=') { value = value >= eval(++++s, 10); continue; }
if(x == '<') { value = value < eval(++s, 10); continue; }
if(x == '>') { value = value > eval(++s, 10); continue; }
if(depth >= 9) break;
if(x == '=' && y == '=') { value = value == eval(++++s, 9); continue; }
if(x == '!' && y == '=') { value = value != eval(++++s, 9); continue; }
if(depth >= 8) break;
if(x == '&' && y != '&') { value = value & eval(++s, 8); continue; }
if(depth >= 7) break;
if(x == '^' && y != '^') { value = value ^ eval(++s, 7); continue; }
if(depth >= 6) break;
if(x == '|' && y != '|') { value = value | eval(++s, 6); continue; }
if(depth >= 5) break;
if(x == '&' && y == '&') { value = eval(++++s, 5) && value; continue; }
if(depth >= 4) break;
if(x == '^' && y == '^') { value = (!eval(++++s, 4) != !value); continue; }
if(depth >= 3) break;
if(x == '|' && y == '|') { value = eval(++++s, 3) || value; continue; }
if(x == '?') {
int lhs = eval(++s, 2);
if(*s != ':') throw "nall::bad_eval";
int rhs = eval(++s, 2);
value = value ? lhs : rhs;
continue;
}
if(depth >= 2) break;
if(depth > 0 && x == ')') break;
throw "nall::bad_eval";
}
static int eval(const char *&s, int depth = 0) {
while(*s == ' ' || *s == '\t') s++; //trim whitespace
if(!*s) throw "unrecognized_token";
int value = 0, x = *s, y = *(s + 1);
if(*s == '(') {
value = eval(++s, 1);
if(*s++ != ')') throw "mismatched_group";
}
else if(x == '!') value = !eval(++s, 13);
else if(x == '~') value = ~eval(++s, 13);
else if(x == '+') value = +eval(++s, 13);
else if(x == '-') value = -eval(++s, 13);
else if((x >= '0' && x <= '9') || x == '\'') value = eval_integer(s);
else throw "unrecognized_token";
while(true) {
while(*s == ' ' || *s == '\t') s++; //trim whitespace
if(!*s) break;
x = *s, y = *(s + 1);
if(depth >= 13) break;
if(x == '*') { value *= eval(++s, 13); continue; }
if(x == '/') { value /= eval(++s, 13); continue; }
if(x == '%') { value %= eval(++s, 13); continue; }
if(depth >= 12) break;
if(x == '+') { value += eval(++s, 12); continue; }
if(x == '-') { value -= eval(++s, 12); continue; }
if(depth >= 11) break;
if(x == '<' && y == '<') { value <<= eval(++++s, 11); continue; }
if(x == '>' && y == '>') { value >>= eval(++++s, 11); continue; }
if(depth >= 10) break;
if(x == '<' && y == '=') { value = value <= eval(++++s, 10); continue; }
if(x == '>' && y == '=') { value = value >= eval(++++s, 10); continue; }
if(x == '<') { value = value < eval(++s, 10); continue; }
if(x == '>') { value = value > eval(++s, 10); continue; }
if(depth >= 9) break;
if(x == '=' && y == '=') { value = value == eval(++++s, 9); continue; }
if(x == '!' && y == '=') { value = value != eval(++++s, 9); continue; }
if(depth >= 8) break;
if(x == '&' && y != '&') { value = value & eval(++s, 8); continue; }
if(depth >= 7) break;
if(x == '^' && y != '^') { value = value ^ eval(++s, 7); continue; }
if(depth >= 6) break;
if(x == '|' && y != '|') { value = value | eval(++s, 6); continue; }
if(depth >= 5) break;
if(x == '&' && y == '&') { value = eval(++++s, 5) && value; continue; }
if(depth >= 4) break;
if(x == '^' && y == '^') { value = (!eval(++++s, 4) != !value); continue; }
if(depth >= 3) break;
if(x == '|' && y == '|') { value = eval(++++s, 3) || value; continue; }
if(x == '?') {
int lhs = eval(++s, 2);
if(*s != ':') throw "mismatched_ternary";
int rhs = eval(++s, 2);
value = value ? lhs : rhs;
continue;
}
if(depth >= 2) break;
if(depth > 0 && x == ')') break;
throw "unrecognized_token";
}
