Cube  Check-in [dab8760d1e]

// command.cpp: implements the parsing and execution of a tiny script language
// which is largely backwards compatible with the quake console language.

#include "cube.h"

#include <memory>

#import "Alias.h"
#import "Command.h"
#import "Identifier.h"
#import "Variable.h"

void
itoa(char *s, int i)
{
	sprintf_s(s)("%d", i);
}

char *
exchangestr(char *o, const char *n)
{
	free(o);
	return strdup(n);
}

// contains ALL vars/commands/aliases
static OFMutableDictionary<OFString *, __kindof Identifier *> *identifiers;

void
alias(OFString *name, OFString *action)
{
	Alias *alias = identifiers[name];

		identifiers = [[OFMutableDictionary alloc] init];

	identifiers[name] = command;

	return false;
}

// parse any nested set of () or []
char *
parseexp(char *&p, int right) // parse any nested set of () or []
parseexp(char *&p, int right)
{
	int left = *p++;
	char *word = p;
	for (int brak = 1; brak;) {
		int c = *p++;
		if (c == '\r')
			*(p - 1) = ' '; // hack
		if (c == left)
			brak++;
		else if (c == right)
			brak--;
		else if (!c) {
			p--;
			conoutf(@"missing \"%c\"", right);
			return NULL;
		}
	}
	char *s = strndup(word, p - word - 1);
	if (left == '(') {
		string t;
		// evaluate () exps directly, and substitute result
		@autoreleasepool {
			OFString *t;
			@try {
				t = [OFString
			itoa(t, execute(@(s)));
		}
		s = exchangestr(s, t);
				    stringWithFormat:@"%d", execute(@(s))];
			} @finally {
				free(s);
			}
			s = strdup(t.UTF8String);
		}
	}
	return s;
}

// parse single argument, including expressions
char *
parseword(char *&p) // parse single argument, including expressions
parseword(char *&p)
{
	p += strspn(p, " \t\r");
	if (p[0] == '/' && p[1] == '/')
		p += strcspn(p, "\n\0");
	if (*p == '\"') {
		p++;
		char *word = p;

			return [identifier action];
	}

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

// all evaluation happens here, recursively
int
execute(
execute(OFString *string, bool isDown)
    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 = "";
					s = strdup("");
				}
				@try {
				if (*s == '$')
					// substitute variables
					w[i] = lookup(@(s));
				else
					w[i] = @(s);
					if (*s == '$')
						// substitute variables
						w[i] = lookup(@(s));
					else
						w[i] = @(s);
				} @finally {
					free(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

					// call it
					OFArray<OFString *> *arguments =
					    [[OFArray alloc]
					        initWithObjects:w
					                  count:numargs];
					val = [identifier
					    callWithArguments:arguments
					               isDown:isdown];
					               isDown:isDown];
				} else if ([identifier
				               isKindOfClass:[Variable
				                                 class]]) {
					// game defined variables
					if (isdown) {
					if (isDown) {
						if (w[1].length == 0)
							[identifier printValue];
						else
							[identifier
							    setValue:
							        (int)[w[1]
							            longLongValueWithBase:

						// (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);
					    [identifier action], isDown);
					break;
				}
			}
		}

		return val;
	}