php 加入 unless 语法

 1 <ST_IN_SCRIPTING>"while" {
 2     RETURN_TOKEN(T_WHILE);
 3 }
 4 
 5 <ST_IN_SCRIPTING>"unless" {
 6     RETURN_TOKEN(T_UNLESS);
 7 }
 8 
 9 <ST_IN_SCRIPTING>"endwhile" {
10     RETURN_TOKEN(T_ENDWHILE);
11 }
12 
13 <ST_IN_SCRIPTING>"endunless" {
14     RETURN_TOKEN(T_ENDUNLESS);
15 }

1 reserved_non_modifiers:
2       T_INCLUDE | T_INCLUDE_ONCE | T_EVAL | T_REQUIRE | T_REQUIRE_ONCE | T_LOGICAL_OR | T_LOGICAL_XOR | T_LOGICAL_AND
3     | T_INSTANCEOF | T_NEW | T_CLONE | T_EXIT | T_IF | T_ELSEIF | T_ELSE | T_ENDIF | T_ECHO | T_DO | T_WHILE | T_ENDWHILE
4     | T_FOR | T_ENDFOR | T_FOREACH | T_ENDFOREACH | T_DECLARE | T_ENDDECLARE | T_AS | T_TRY | T_CATCH | T_FINALLY
5     | T_THROW | T_USE | T_INSTEADOF | T_GLOBAL | T_VAR | T_UNSET | T_ISSET | T_EMPTY | T_CONTINUE | T_GOTO
6     | T_FUNCTION | T_CONST | T_RETURN | T_PRINT | T_YIELD | T_LIST | T_SWITCH | T_ENDSWITCH | T_CASE | T_DEFAULT | T_BREAK
7     | T_ARRAY | T_CALLABLE | T_EXTENDS | T_IMPLEMENTS | T_NAMESPACE | T_TRAIT | T_INTERFACE | T_CLASS
8     | T_CLASS_C | T_TRAIT_C | T_FUNC_C | T_METHOD_C | T_LINE | T_FILE | T_DIR | T_NS_C | T_UNLESS | T_ENDUNLESS
9 ;

1 %token T_WHILE      "while (T_WHILE)"
2 %token T_UNLESS     "unless (T_UNLESS)"
3 %token T_ENDWHILE   "endwhile (T_ENDWHILE)"
4 %token T_ENDUNLESS  "endunless (T_ENDUNLESS)"

%type <ast> expr optional_expr while_statement unless_statement for_statement foreach_variable 

1     |    T_WHILE ‘(‘ expr ‘)‘ while_statement
2             { $$ = zend_ast_create(ZEND_AST_WHILE, $3, $5); }
3     |   T_UNLESS ‘(‘ expr ‘)‘ unless_statement
4             { $$ = zend_ast_create(ZEND_AST_UNLESS, $3, $5); }

1 while_statement:
2         statement { $$ = $1; }
3     |    ‘:‘ inner_statement_list T_ENDWHILE ‘;‘ { $$ = $2; }
4 ;
5 
6 unless_statement:
7         statement { $$ = $1; } 
8     |   ‘:‘ inner_statement_list T_ENDUNLESS ‘;‘  { $$ = $2; }
9 ;

1     ZEND_AST_GROUP_USE,
2     ZEND_AST_UNLESS,
3 
4     /* 3 child nodes */

 1 zend_ast_export_indent(str, indent);
 2 zend_ast_export_indent(str, indent);
 3 zend_ast_export_ex(str, ast, 0, indent);
 4 switch (ast->kind) {
 5     case ZEND_AST_LABEL:
 6     case ZEND_AST_IF:
 7     case ZEND_AST_UNLESS:
 8     case ZEND_AST_SWITCH:
 9     case ZEND_AST_WHILE:
10     case ZEND_AST_TRY:
11     case ZEND_AST_FOR:
12     case ZEND_AST_FOREACH:
13     case ZEND_AST_FUNC_DECL:
14     case ZEND_AST_METHOD:
15     case ZEND_AST_CLASS:
16     case ZEND_AST_USE_TRAIT:
17     case ZEND_AST_NAMESPACE:
18     case ZEND_AST_DECLARE:
19         break;
20     default:
21     smart_str_appendc(str, ‘;‘);
22         break;
23     }
24 smart_str_appendc(str, ‘\n‘);

 1 void zend_compile_unless(zend_ast *ast)
 2 {
 3     zend_ast *cond_ast = ast->child[0];
 4     zend_ast *stmt_ast = ast->child[1];
 5     znode cond_node;
 6     
 7     uint32_t opnum_cond;
 8     
 9     zend_compile_expr(&cond_node,cond_ast);
10     
11     opnum_cond = zend_emit_cond_jump(ZEND_JMPNZ,&cond_node,0);
12 
13     zend_compile_stmt(stmt_ast);
14 
15     zend_update_jump_target_to_next(opnum_cond);
16 }

1 case ZEND_AST_IF:
2         zend_compile_if(ast);
3     break;
4 case ZEND_AST_UNLESS:
5     zend_compile_unless(ast);
6     break;

1 <?php
2 unless(0)
3 {
4     echo "Hello the world!\n";
5 }
6 
7 unless(0):
8     echo "Hello the world!\n";
9 endunless;

1 root@ubuntu:~/tmp# php a.php 
2 Hello the world!
3 Hello the world!