Function ParseExpression

source/common/console/c_expr.cpp:161–240

//==========================================================================

static FProduction *ParseExpression (FCommandLine &argv, int &parsept)
{
	if (parsept >= argv.argc())
		return NULL;

	const char *token = argv[parsept++];
	FProduction *prod1 = NULL, *prod2 = NULL, *prod3 = NULL;

	if (IsFloat (token))
	{
		return NewDoubleProd (atof(token));
	}
	else if (stricmp (token, "true") == 0)
	{
		return NewDoubleProd (1.0);
	}
	else if (stricmp (token, "false") == 0)
	{
		return NewDoubleProd (0.0);
	}
	else
	{
		for (size_t i = 0; i < countof(Producers); ++i)
		{
			if (strcmp (Producers[i].Token, token) == 0)
			{
				prod1 = ParseExpression (argv, parsept);
				prod2 = ParseExpression (argv, parsept);
				if (prod1 == NULL || prod2 == NULL)
				{
					goto missing;
				}
				if (Producers[i].StringProducer == NULL)
				{
					DoubleCoerce (prod1, prod2);
				}
				else if (Producers[i].DoubleProducer == NULL)
				{
					MustStringCoerce (prod1, prod2);
				}
				else
				{
					MaybeStringCoerce (prod1, prod2);
				}
				if (prod1->Type == PROD_String)
				{
					prod3 = Producers[i].StringProducer ((FStringProd *)prod1, (FStringProd *)prod2);
				}
				else
				{
					prod3 = Producers[i].DoubleProducer ((FDoubleProd *)prod1, (FDoubleProd *)prod2);
				}
				goto done;
			}
		}
		if (strcmp ("!", token) == 0)
		{
			prod1 = ParseExpression (argv, parsept);