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if not() support

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This commit is contained in:
Wolfgang (Blub) Bumiller 2012-11-13 18:54:25 +01:00
parent 6204c8c956
commit e7d558dbd8
1 changed files with 18 additions and 3 deletions
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21
parser.c
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@ -1418,11 +1418,23 @@ static bool parse_if(parser_t *parser, ast_block *block, ast_expression **out)
{
ast_ifthen *ifthen;
ast_expression *cond, *ontrue, *onfalse = NULL;
bool ifnot = false;
lex_ctx ctx = parser_ctx(parser);
/* skip the 'if' and check for opening paren */
if (!parser_next(parser) || parser->tok != '(') {
/* skip the 'if', parse an optional 'not' and check for an opening paren */
if (!parser_next(parser)) {
parseerror(parser, "expected condition or 'not'");
return false;
}
if (parser->tok == TOKEN_KEYWORD && !strcmp(parser_tokval(parser), "not")) {
ifnot = true;
if (!parser_next(parser)) {
parseerror(parser, "expected condition in parenthesis");
return false;
}
}
if (parser->tok != '(') {
parseerror(parser, "expected 'if' condition in parenthesis");
return false;
}
@ -1469,7 +1481,10 @@ static bool parse_if(parser_t *parser, ast_block *block, ast_expression **out)
}
}
ifthen = ast_ifthen_new(ctx, cond, ontrue, onfalse);
if (ifnot)
ifthen = ast_ifthen_new(ctx, cond, onfalse, ontrue);
else
ifthen = ast_ifthen_new(ctx, cond, ontrue, onfalse);
*out = (ast_expression*)ifthen;
return true;
}