diff options
| author | Nikita Popov <nikita.ppv@gmail.com> | 2019-01-15 17:04:24 +0100 |
|---|---|---|
| committer | Nikita Popov <nikita.ppv@gmail.com> | 2019-01-22 11:12:04 +0100 |
| commit | a50198d0fef652ca052cda642d6e98a9101eb73f (patch) | |
| tree | 8bd51746c7418ae0826d527eb57fbebdb67b05d7 /Zend/zend_language_parser.y | |
| parent | 50ddff94b9989342e66678c311b3abf4e7d5a074 (diff) | |
| download | php-git-a50198d0fef652ca052cda642d6e98a9101eb73f.tar.gz | |
Implement ??= operator
RFC: https://wiki.php.net/rfc/null_coalesce_equal_operator
$a ??= $b is $a ?? ($a = $b), with the difference that $a is only
evaluated once, to the degree that this is possible. In particular
in $a[foo()] ?? $b function foo() is only ever called once.
However, the variable access themselves will be reevaluated.
Diffstat (limited to 'Zend/zend_language_parser.y')
| -rw-r--r-- | Zend/zend_language_parser.y | 5 |
1 files changed, 4 insertions, 1 deletions
diff --git a/Zend/zend_language_parser.y b/Zend/zend_language_parser.y index c1902303c2..ff0249303d 100644 --- a/Zend/zend_language_parser.y +++ b/Zend/zend_language_parser.y @@ -60,7 +60,7 @@ static YYSIZE_T zend_yytnamerr(char*, const char*); %right T_YIELD %right T_DOUBLE_ARROW %right T_YIELD_FROM -%left '=' T_PLUS_EQUAL T_MINUS_EQUAL T_MUL_EQUAL T_DIV_EQUAL T_CONCAT_EQUAL T_MOD_EQUAL T_AND_EQUAL T_OR_EQUAL T_XOR_EQUAL T_SL_EQUAL T_SR_EQUAL T_POW_EQUAL +%left '=' T_PLUS_EQUAL T_MINUS_EQUAL T_MUL_EQUAL T_DIV_EQUAL T_CONCAT_EQUAL T_MOD_EQUAL T_AND_EQUAL T_OR_EQUAL T_XOR_EQUAL T_SL_EQUAL T_SR_EQUAL T_POW_EQUAL T_COALESCE_EQUAL %left '?' ':' %right T_COALESCE %left T_BOOLEAN_OR @@ -118,6 +118,7 @@ static YYSIZE_T zend_yytnamerr(char*, const char*); %token T_XOR_EQUAL "^= (T_XOR_EQUAL)" %token T_SL_EQUAL "<<= (T_SL_EQUAL)" %token T_SR_EQUAL ">>= (T_SR_EQUAL)" +%token T_COALESCE_EQUAL "??= (T_COALESCE_EQUAL)" %token T_BOOLEAN_OR "|| (T_BOOLEAN_OR)" %token T_BOOLEAN_AND "&& (T_BOOLEAN_AND)" %token T_IS_EQUAL "== (T_IS_EQUAL)" @@ -906,6 +907,8 @@ expr: { $$ = zend_ast_create_assign_op(ZEND_ASSIGN_SL, $1, $3); } | variable T_SR_EQUAL expr { $$ = zend_ast_create_assign_op(ZEND_ASSIGN_SR, $1, $3); } + | variable T_COALESCE_EQUAL expr + { $$ = zend_ast_create(ZEND_AST_ASSIGN_COALESCE, $1, $3); } | variable T_INC { $$ = zend_ast_create(ZEND_AST_POST_INC, $1); } | T_INC variable { $$ = zend_ast_create(ZEND_AST_PRE_INC, $2); } | variable T_DEC { $$ = zend_ast_create(ZEND_AST_POST_DEC, $1); } |