Cube  Diff

	char *word = p;
	p += strcspn(p, "; \t\r\n\0");
	if (p - word == 0)
		return NULL;
	return newstring(word, p - word);
}

OFString *
lookup(OFString *n) // find value of ident referenced with $ in exp
{
	@autoreleasepool {
		__kindof Identifier *identifier =
		    identifiers[[n substringFromIndex:1]];

		if ([identifier isKindOfClass:[Variable class]]) {
			return [OFString
			    stringWithFormat:@"%d", *[identifier storage]];

		} else if ([identifier isKindOfClass:[Alias class]])
			return [identifier action];
	}

	conoutf(@"unknown alias lookup: %@", [n substringFromIndex:1]);
	return n;
}

int
execute(
    OFString *string, bool isdown) // all evaluation happens here, recursively
{
	@autoreleasepool {
		std::unique_ptr<char> copy(strdup(string.UTF8String));
		char *p = copy.get();
		const int MAXWORDS = 25; // limit, remove
		OFString *w[MAXWORDS];
		int val = 0;
		for (bool cont = true; cont;) {
			// for each ; seperated statement
			int numargs = MAXWORDS;
			loopi(MAXWORDS)
			{
				// collect all argument values
				w[i] = @"";
				if (i > numargs)
					continue;
				// parse and evaluate exps
				char *s = parseword(p);
				if (!s) {
					numargs = i;
					s = "";
				}
				if (*s == '$')
					// substitute variables
					w[i] = lookup(@(s));
				else
					w[i] = @(s);
			}

			p += strcspn(p, ";\n\0");
			// more statements if this isn't the end of the string
			cont = *p++ != 0;
			OFString *c = w[0];
			// strip irc-style command prefix
			if ([c hasPrefix:@"/"])
				c = [c substringFromIndex:1];
			// empty statement
			if (c.length == 0)
				continue;

			__kindof Identifier *identifier = identifiers[c];
			if (identifier == nil) {
				@try {
					val = (int)[c longLongValueWithBase:0];
				} @catch (OFInvalidFormatException *e) {
					conoutf(@"unknown command: %s", c);
				}
			} else {
				if ([identifier
				        isKindOfClass:[Command class]]) {
					// game defined commands use very
					// ad-hoc function signature, and just
					// call it
					OFArray<OFString *> *arguments =
					    [[OFArray alloc]
					        initWithObjects:w
					                  count:numargs + 1];
					val = [identifier
					    callWithArguments:arguments

					               isDown:isdown];
				} else if ([identifier
				               isKindOfClass:[Variable
				                                 class]]) {
					// game defined variables
					if (isdown) {
						if (w[1].length == 0)
							[identifier printValue];
						else
							[identifier
							    setValue:
							        (int)[w[1]
							            longLongValueWithBase:
							                0]];
					}
				} else if ([identifier
				               isKindOfClass:[Alias class]]) {
					// alias, also used as functions and
					// (global) variables
					for (int i = 1; i < numargs; i++) {

						// set any arguments as
						// (global) arg values so
						// functions can access them

						OFString *t = [OFString
						    stringWithFormat:@"arg%d",
						    i];
						alias(t, w[i]);

					}
					// create new string here because alias
					// could rebind itself
					val = execute(
					    [[identifier action] copy], isdown);
					break;
				}
			}

		}

		return val;
	}
}

// tab-completion of all identifiers