[PHP-DOC] cvs: ZendEngine2 / zend_language_parser.y

[Marcus Boerger]

helly           Sun Mar  4 16:25:58 2007 UTC

  Modified files:              
    /ZendEngine2        zend_language_parser.y 
  Log:
  - Implement '?:'
  [DOC] "expr1 ?: expr1" is a shortcut for: "expr1 ? expr1 : expr2" as
        exists in gcc and discussed some time back. Note that this is not
        an implementation ifsetor($var, default). While ifsetor would not
        generate any message for non existing variables or array indices
        the ternary shortcut does. Also the ternary shortcut does a boolean
        evaluation rather then checking for isset(). That way ther ternary
        shortcut can work on any expression while ifsetor can only work on
        variables. Also to be silent one has do do: "@$expr1 ?: $expr2".
  
  
http://cvs.php.net/viewvc.cgi/ZendEngine2/zend_language_parser.y?r1=1.178&r2=1.179&diff_format=u
Index: ZendEngine2/zend_language_parser.y
diff -u ZendEngine2/zend_language_parser.y:1.178 
ZendEngine2/zend_language_parser.y:1.179
--- ZendEngine2/zend_language_parser.y:1.178    Mon Jan 29 04:40:46 2007
+++ ZendEngine2/zend_language_parser.y  Sun Mar  4 16:25:57 2007
@@ -18,7 +18,7 @@
    +----------------------------------------------------------------------+
 */
 
-/* $Id: zend_language_parser.y,v 1.178 2007/01/29 04:40:46 iliaa Exp $ */
+/* $Id: zend_language_parser.y,v 1.179 2007/03/04 16:25:57 helly Exp $ */
 
 /*
  * LALR shift/reduce conflicts and how they are resolved:
@@ -611,6 +611,9 @@
        |       expr '?' { zend_do_begin_qm_op(&$1, &$2 TSRMLS_CC); }
                expr ':' { zend_do_qm_true(&$4, &$2, &$5 TSRMLS_CC); }
                expr     { zend_do_qm_false(&$$, &$7, &$2, &$5 TSRMLS_CC); }
+       |       expr '?' { zend_do_begin_qm_op(&$1, &$2 TSRMLS_CC); }
+               ':'      { zend_do_qm_true(&$1, &$2, &$4 TSRMLS_CC); }
+               expr     { zend_do_qm_false(&$$, &$6, &$2, &$4 TSRMLS_CC); }
        |       internal_functions_in_yacc { $$ = $1; }
        |       T_INT_CAST expr         { zend_do_cast(&$$, &$2, IS_LONG 
TSRMLS_CC); }
        |       T_DOUBLE_CAST expr      { zend_do_cast(&$$, &$2, IS_DOUBLE 
TSRMLS_CC); }