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zend_language_parser.y
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%{
/*
+----------------------------------------------------------------------+
| Zend Engine |
+----------------------------------------------------------------------+
| Copyright (c) 1998-2015 Zend Technologies Ltd. (http://www.zend.com) |
+----------------------------------------------------------------------+
| This source file is subject to version 2.00 of the Zend license, |
| that is bundled with this package in the file LICENSE, and is |
| available through the world-wide-web at the following url: |
| http://www.zend.com/license/2_00.txt. |
| If you did not receive a copy of the Zend license and are unable to |
| obtain it through the world-wide-web, please send a note to |
| [email protected] so we can mail you a copy immediately. |
+----------------------------------------------------------------------+
| Authors: Andi Gutmans <[email protected]> |
| Zeev Suraski <[email protected]> |
| Nikita Popov <[email protected]> |
+----------------------------------------------------------------------+
*/
/* $Id$ */
#include "zend_compile.h"
#include "zend.h"
#include "zend_list.h"
#include "zend_globals.h"
#include "zend_API.h"
#include "zend_constants.h"
#include "zend_language_scanner.h"
#define YYSIZE_T size_t
#define yytnamerr zend_yytnamerr
static YYSIZE_T zend_yytnamerr(char*, const char*);
#define YYERROR_VERBOSE
#define YYSTYPE zend_parser_stack_elem
#ifdef _MSC_VER
#define YYMALLOC malloc
#define YYFREE free
#endif
%}
%pure_parser
%expect 0
%code requires {
}
%destructor { zend_ast_destroy($$); } <ast>
%destructor { if ($$) zend_string_release($$); } <str>
%left T_INCLUDE T_INCLUDE_ONCE T_EVAL T_REQUIRE T_REQUIRE_ONCE
%left ','
%left T_LOGICAL_OR
%left T_LOGICAL_XOR
%left T_LOGICAL_AND
%right T_PRINT
%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 '?' ':'
%right T_COALESCE
%left T_BOOLEAN_OR
%left T_BOOLEAN_AND
%left '|'
%left '^'
%left '&'
%nonassoc T_IS_EQUAL T_IS_NOT_EQUAL T_IS_IDENTICAL T_IS_NOT_IDENTICAL T_SPACESHIP
%nonassoc '<' T_IS_SMALLER_OR_EQUAL '>' T_IS_GREATER_OR_EQUAL
%left T_SL T_SR
%left '+' '-' '.'
%left '*' '/' '%'
%right '!'
%nonassoc T_INSTANCEOF
%right '~' T_INC T_DEC T_INT_CAST T_DOUBLE_CAST T_STRING_CAST T_ARRAY_CAST T_OBJECT_CAST T_BOOL_CAST T_UNSET_CAST '@'
%right T_POW
%right '['
%nonassoc T_NEW T_CLONE
%left T_NOELSE
%left T_ELSEIF
%left T_ELSE
%left T_ENDIF
%right T_STATIC T_ABSTRACT T_FINAL T_PRIVATE T_PROTECTED T_PUBLIC
%token <ast> T_LNUMBER "integer number (T_LNUMBER)"
%token <ast> T_DNUMBER "floating-point number (T_DNUMBER)"
%token <ast> T_STRING "identifier (T_STRING)"
%token <ast> T_VARIABLE "variable (T_VARIABLE)"
%token <ast> T_INLINE_HTML
%token <ast> T_ENCAPSED_AND_WHITESPACE "quoted-string and whitespace (T_ENCAPSED_AND_WHITESPACE)"
%token <ast> T_CONSTANT_ENCAPSED_STRING "quoted-string (T_CONSTANT_ENCAPSED_STRING)"
%token <ast> T_STRING_VARNAME "variable name (T_STRING_VARNAME)"
%token <ast> T_NUM_STRING "number (T_NUM_STRING)"
%token END 0 "end of file"
%token T_INCLUDE "include (T_INCLUDE)"
%token T_INCLUDE_ONCE "include_once (T_INCLUDE_ONCE)"
%token T_EVAL "eval (T_EVAL)"
%token T_REQUIRE "require (T_REQUIRE)"
%token T_REQUIRE_ONCE "require_once (T_REQUIRE_ONCE)"
%token T_LOGICAL_OR "or (T_LOGICAL_OR)"
%token T_LOGICAL_XOR "xor (T_LOGICAL_XOR)"
%token T_LOGICAL_AND "and (T_LOGICAL_AND)"
%token T_PRINT "print (T_PRINT)"
%token T_YIELD "yield (T_YIELD)"
%token T_YIELD_FROM "yield from (T_YIELD_FROM)"
%token T_PLUS_EQUAL "+= (T_PLUS_EQUAL)"
%token T_MINUS_EQUAL "-= (T_MINUS_EQUAL)"
%token T_MUL_EQUAL "*= (T_MUL_EQUAL)"
%token T_DIV_EQUAL "/= (T_DIV_EQUAL)"
%token T_CONCAT_EQUAL ".= (T_CONCAT_EQUAL)"
%token T_MOD_EQUAL "%= (T_MOD_EQUAL)"
%token T_AND_EQUAL "&= (T_AND_EQUAL)"
%token T_OR_EQUAL "|= (T_OR_EQUAL)"
%token T_XOR_EQUAL "^= (T_XOR_EQUAL)"
%token T_SL_EQUAL "<<= (T_SL_EQUAL)"
%token T_SR_EQUAL ">>= (T_SR_EQUAL)"
%token T_BOOLEAN_OR "|| (T_BOOLEAN_OR)"
%token T_BOOLEAN_AND "&& (T_BOOLEAN_AND)"
%token T_IS_EQUAL "== (T_IS_EQUAL)"
%token T_IS_NOT_EQUAL "!= (T_IS_NOT_EQUAL)"
%token T_IS_IDENTICAL "=== (T_IS_IDENTICAL)"
%token T_IS_NOT_IDENTICAL "!== (T_IS_NOT_IDENTICAL)"
%token T_IS_SMALLER_OR_EQUAL "<= (T_IS_SMALLER_OR_EQUAL)"
%token T_IS_GREATER_OR_EQUAL ">= (T_IS_GREATER_OR_EQUAL)"
%token T_SPACESHIP "<=> (T_SPACESHIP)"
%token T_SL "<< (T_SL)"
%token T_SR ">> (T_SR)"
%token T_INSTANCEOF "instanceof (T_INSTANCEOF)"
%token T_INC "++ (T_INC)"
%token T_DEC "-- (T_DEC)"
%token T_INT_CAST "(int) (T_INT_CAST)"
%token T_DOUBLE_CAST "(double) (T_DOUBLE_CAST)"
%token T_STRING_CAST "(string) (T_STRING_CAST)"
%token T_ARRAY_CAST "(array) (T_ARRAY_CAST)"
%token T_OBJECT_CAST "(object) (T_OBJECT_CAST)"
%token T_BOOL_CAST "(bool) (T_BOOL_CAST)"
%token T_UNSET_CAST "(unset) (T_UNSET_CAST)"
%token T_NEW "new (T_NEW)"
%token T_CLONE "clone (T_CLONE)"
%token T_EXIT "exit (T_EXIT)"
%token T_IF "if (T_IF)"
%token T_ELSEIF "elseif (T_ELSEIF)"
%token T_ELSE "else (T_ELSE)"
%token T_ENDIF "endif (T_ENDIF)"
%token T_ECHO "echo (T_ECHO)"
%token T_DO "do (T_DO)"
%token T_WHILE "while (T_WHILE)"
%token T_ENDWHILE "endwhile (T_ENDWHILE)"
%token T_FOR "for (T_FOR)"
%token T_ENDFOR "endfor (T_ENDFOR)"
%token T_FOREACH "foreach (T_FOREACH)"
%token T_ENDFOREACH "endforeach (T_ENDFOREACH)"
%token T_DECLARE "declare (T_DECLARE)"
%token T_ENDDECLARE "enddeclare (T_ENDDECLARE)"
%token T_AS "as (T_AS)"
%token T_SWITCH "switch (T_SWITCH)"
%token T_ENDSWITCH "endswitch (T_ENDSWITCH)"
%token T_CASE "case (T_CASE)"
%token T_DEFAULT "default (T_DEFAULT)"
%token T_BREAK "break (T_BREAK)"
%token T_CONTINUE "continue (T_CONTINUE)"
%token T_GOTO "goto (T_GOTO)"
%token T_FUNCTION "function (T_FUNCTION)"
%token T_CONST "const (T_CONST)"
%token T_RETURN "return (T_RETURN)"
%token T_TRY "try (T_TRY)"
%token T_CATCH "catch (T_CATCH)"
%token T_FINALLY "finally (T_FINALLY)"
%token T_THROW "throw (T_THROW)"
%token T_USE "use (T_USE)"
%token T_INSTEADOF "insteadof (T_INSTEADOF)"
%token T_GLOBAL "global (T_GLOBAL)"
%token T_STATIC "static (T_STATIC)"
%token T_ABSTRACT "abstract (T_ABSTRACT)"
%token T_FINAL "final (T_FINAL)"
%token T_PRIVATE "private (T_PRIVATE)"
%token T_PROTECTED "protected (T_PROTECTED)"
%token T_PUBLIC "public (T_PUBLIC)"
%token T_VAR "var (T_VAR)"
%token T_UNSET "unset (T_UNSET)"
%token T_ISSET "isset (T_ISSET)"
%token T_EMPTY "empty (T_EMPTY)"
%token T_HALT_COMPILER "__halt_compiler (T_HALT_COMPILER)"
%token T_CLASS "class (T_CLASS)"
%token T_TRAIT "trait (T_TRAIT)"
%token T_INTERFACE "interface (T_INTERFACE)"
%token T_EXTENDS "extends (T_EXTENDS)"
%token T_IMPLEMENTS "implements (T_IMPLEMENTS)"
%token T_OBJECT_OPERATOR "-> (T_OBJECT_OPERATOR)"
%token T_DOUBLE_ARROW "=> (T_DOUBLE_ARROW)"
%token T_LIST "list (T_LIST)"
%token T_ARRAY "array (T_ARRAY)"
%token T_CALLABLE "callable (T_CALLABLE)"
%token T_LINE "__LINE__ (T_LINE)"
%token T_FILE "__FILE__ (T_FILE)"
%token T_DIR "__DIR__ (T_DIR)"
%token T_CLASS_C "__CLASS__ (T_CLASS_C)"
%token T_TRAIT_C "__TRAIT__ (T_TRAIT_C)"
%token T_METHOD_C "__METHOD__ (T_METHOD_C)"
%token T_FUNC_C "__FUNCTION__ (T_FUNC_C)"
%token T_COMMENT "comment (T_COMMENT)"
%token T_DOC_COMMENT "doc comment (T_DOC_COMMENT)"
%token T_OPEN_TAG "open tag (T_OPEN_TAG)"
%token T_OPEN_TAG_WITH_ECHO "open tag with echo (T_OPEN_TAG_WITH_ECHO)"
%token T_CLOSE_TAG "close tag (T_CLOSE_TAG)"
%token T_WHITESPACE "whitespace (T_WHITESPACE)"
%token T_START_HEREDOC "heredoc start (T_START_HEREDOC)"
%token T_END_HEREDOC "heredoc end (T_END_HEREDOC)"
%token T_DOLLAR_OPEN_CURLY_BRACES "${ (T_DOLLAR_OPEN_CURLY_BRACES)"
%token T_CURLY_OPEN "{$ (T_CURLY_OPEN)"
%token T_PAAMAYIM_NEKUDOTAYIM ":: (T_PAAMAYIM_NEKUDOTAYIM)"
%token T_NAMESPACE "namespace (T_NAMESPACE)"
%token T_NS_C "__NAMESPACE__ (T_NS_C)"
%token T_NS_SEPARATOR "\\ (T_NS_SEPARATOR)"
%token T_ELLIPSIS "... (T_ELLIPSIS)"
%token T_COALESCE "?? (T_COALESCE)"
%token T_POW "** (T_POW)"
%token T_POW_EQUAL "**= (T_POW_EQUAL)"
/* Token used to force a parse error from the lexer */
%token T_ERROR
%type <ast> top_statement namespace_name name statement function_declaration_statement
%type <ast> class_declaration_statement trait_declaration_statement
%type <ast> interface_declaration_statement interface_extends_list
%type <ast> group_use_declaration inline_use_declarations inline_use_declaration
%type <ast> mixed_group_use_declaration use_declaration unprefixed_use_declaration
%type <ast> unprefixed_use_declarations const_decl inner_statement
%type <ast> expr optional_expr while_statement for_statement foreach_variable
%type <ast> foreach_statement declare_statement finally_statement unset_variable variable
%type <ast> extends_from parameter optional_type argument expr_without_variable global_var
%type <ast> static_var class_statement trait_adaptation trait_precedence trait_alias
%type <ast> absolute_trait_method_reference trait_method_reference property echo_expr
%type <ast> new_expr anonymous_class class_name class_name_reference simple_variable
%type <ast> internal_functions_in_yacc
%type <ast> exit_expr scalar backticks_expr lexical_var function_call member_name property_name
%type <ast> variable_class_name dereferencable_scalar constant dereferencable
%type <ast> callable_expr callable_variable static_member new_variable
%type <ast> assignment_list_element array_pair encaps_var encaps_var_offset isset_variables
%type <ast> top_statement_list use_declarations const_list inner_statement_list if_stmt
%type <ast> alt_if_stmt for_exprs switch_case_list global_var_list static_var_list
%type <ast> echo_expr_list unset_variables catch_list parameter_list class_statement_list
%type <ast> implements_list case_list if_stmt_without_else
%type <ast> non_empty_parameter_list argument_list non_empty_argument_list property_list
%type <ast> class_const_list class_const_decl name_list trait_adaptations method_body non_empty_for_exprs
%type <ast> ctor_arguments alt_if_stmt_without_else trait_adaptation_list lexical_vars
%type <ast> lexical_var_list encaps_list array_pair_list non_empty_array_pair_list
%type <ast> assignment_list isset_variable type return_type
%type <ast> identifier
%type <num> returns_ref function is_reference is_variadic variable_modifiers
%type <num> method_modifiers non_empty_member_modifiers member_modifier
%type <num> class_modifiers class_modifier use_type
%type <str> backup_doc_comment
%% /* Rules */
start:
top_statement_list { CG(ast) = $1; }
;
reserved_non_modifiers:
T_INCLUDE | T_INCLUDE_ONCE | T_EVAL | T_REQUIRE | T_REQUIRE_ONCE | T_LOGICAL_OR | T_LOGICAL_XOR | T_LOGICAL_AND
| T_INSTANCEOF | T_NEW | T_CLONE | T_EXIT | T_IF | T_ELSEIF | T_ELSE | T_ENDIF | T_ECHO | T_DO | T_WHILE | T_ENDWHILE
| T_FOR | T_ENDFOR | T_FOREACH | T_ENDFOREACH | T_DECLARE | T_ENDDECLARE | T_AS | T_TRY | T_CATCH | T_FINALLY
| T_THROW | T_USE | T_INSTEADOF | T_GLOBAL | T_VAR | T_UNSET | T_ISSET | T_EMPTY | T_CONTINUE | T_GOTO
| T_FUNCTION | T_CONST | T_RETURN | T_PRINT | T_YIELD | T_LIST | T_SWITCH | T_ENDSWITCH | T_CASE | T_DEFAULT | T_BREAK
| T_ARRAY | T_CALLABLE | T_EXTENDS | T_IMPLEMENTS | T_NAMESPACE | T_TRAIT | T_INTERFACE | T_CLASS
| T_CLASS_C | T_TRAIT_C | T_FUNC_C | T_METHOD_C | T_LINE | T_FILE | T_DIR | T_NS_C | T_HALT_COMPILER
;
semi_reserved:
reserved_non_modifiers
| T_STATIC | T_ABSTRACT | T_FINAL | T_PRIVATE | T_PROTECTED | T_PUBLIC
;
identifier:
T_STRING { $$ = $1; }
| semi_reserved {
zval zv;
zend_lex_tstring(&zv);
$$ = zend_ast_create_zval(&zv);
}
;
top_statement_list:
top_statement_list top_statement { $$ = zend_ast_list_add($1, $2); }
| /* empty */ { $$ = zend_ast_create_list(0, ZEND_AST_STMT_LIST); }
;
namespace_name:
T_STRING { $$ = $1; }
| namespace_name T_NS_SEPARATOR T_STRING { $$ = zend_ast_append_str($1, $3); }
;
name:
namespace_name { $$ = $1; $$->attr = ZEND_NAME_NOT_FQ; }
| T_NAMESPACE T_NS_SEPARATOR namespace_name { $$ = $3; $$->attr = ZEND_NAME_RELATIVE; }
| T_NS_SEPARATOR namespace_name { $$ = $2; $$->attr = ZEND_NAME_FQ; }
;
top_statement:
statement { $$ = $1; }
| function_declaration_statement { $$ = $1; }
| class_declaration_statement { $$ = $1; }
| trait_declaration_statement { $$ = $1; }
| interface_declaration_statement { $$ = $1; }
| T_HALT_COMPILER '(' ')' ';'
{ $$ = zend_ast_create(ZEND_AST_HALT_COMPILER,
zend_ast_create_zval_from_long(zend_get_scanned_file_offset()));
zend_stop_lexing(); }
| T_NAMESPACE namespace_name ';'
{ $$ = zend_ast_create(ZEND_AST_NAMESPACE, $2, NULL);
RESET_DOC_COMMENT(); }
| T_NAMESPACE namespace_name { RESET_DOC_COMMENT(); }
'{' top_statement_list '}'
{ $$ = zend_ast_create(ZEND_AST_NAMESPACE, $2, $5); }
| T_NAMESPACE { RESET_DOC_COMMENT(); }
'{' top_statement_list '}'
{ $$ = zend_ast_create(ZEND_AST_NAMESPACE, NULL, $4); }
| T_USE mixed_group_use_declaration ';' { $$ = $2; }
| T_USE use_type group_use_declaration ';' { $$ = $3; $$->attr = $2; }
| T_USE use_declarations ';' { $$ = $2; $$->attr = T_CLASS; }
| T_USE use_type use_declarations ';' { $$ = $3; $$->attr = $2; }
| T_CONST const_list ';' { $$ = $2; }
;
use_type:
T_FUNCTION { $$ = T_FUNCTION; }
| T_CONST { $$ = T_CONST; }
;
group_use_declaration:
namespace_name T_NS_SEPARATOR '{' unprefixed_use_declarations '}'
{ $$ = zend_ast_create(ZEND_AST_GROUP_USE, $1, $4); }
| T_NS_SEPARATOR namespace_name T_NS_SEPARATOR '{' unprefixed_use_declarations '}'
{ $$ = zend_ast_create(ZEND_AST_GROUP_USE, $2, $5); }
;
mixed_group_use_declaration:
namespace_name T_NS_SEPARATOR '{' inline_use_declarations '}'
{ $$ = zend_ast_create(ZEND_AST_GROUP_USE, $1, $4);}
| T_NS_SEPARATOR namespace_name T_NS_SEPARATOR '{' inline_use_declarations '}'
{ $$ = zend_ast_create(ZEND_AST_GROUP_USE, $2, $5); }
;
inline_use_declarations:
inline_use_declarations ',' inline_use_declaration
{ $$ = zend_ast_list_add($1, $3); }
| inline_use_declaration
{ $$ = zend_ast_create_list(1, ZEND_AST_USE, $1); }
;
unprefixed_use_declarations:
unprefixed_use_declarations ',' unprefixed_use_declaration
{ $$ = zend_ast_list_add($1, $3); }
| unprefixed_use_declaration
{ $$ = zend_ast_create_list(1, ZEND_AST_USE, $1); }
;
use_declarations:
use_declarations ',' use_declaration
{ $$ = zend_ast_list_add($1, $3); }
| use_declaration
{ $$ = zend_ast_create_list(1, ZEND_AST_USE, $1); }
;
inline_use_declaration:
unprefixed_use_declaration { $$ = $1; $$->attr = T_CLASS; }
| use_type unprefixed_use_declaration { $$ = $2; $$->attr = $1; }
;
unprefixed_use_declaration:
namespace_name
{ $$ = zend_ast_create(ZEND_AST_USE_ELEM, $1, NULL); }
| namespace_name T_AS T_STRING
{ $$ = zend_ast_create(ZEND_AST_USE_ELEM, $1, $3); }
;
use_declaration:
unprefixed_use_declaration { $$ = $1; }
| T_NS_SEPARATOR unprefixed_use_declaration { $$ = $2; }
;
const_list:
const_list ',' const_decl { $$ = zend_ast_list_add($1, $3); }
| const_decl { $$ = zend_ast_create_list(1, ZEND_AST_CONST_DECL, $1); }
;
inner_statement_list:
inner_statement_list inner_statement
{ $$ = zend_ast_list_add($1, $2); }
| /* empty */
{ $$ = zend_ast_create_list(0, ZEND_AST_STMT_LIST); }
;
inner_statement:
statement { $$ = $1; }
| function_declaration_statement { $$ = $1; }
| class_declaration_statement { $$ = $1; }
| trait_declaration_statement { $$ = $1; }
| interface_declaration_statement { $$ = $1; }
| T_HALT_COMPILER '(' ')' ';'
{ $$ = NULL; zend_error_noreturn(E_COMPILE_ERROR,
"__HALT_COMPILER() can only be used from the outermost scope"); }
;
statement:
'{' inner_statement_list '}' { $$ = $2; }
| if_stmt { $$ = $1; }
| alt_if_stmt { $$ = $1; }
| T_WHILE '(' expr ')' while_statement
{ $$ = zend_ast_create(ZEND_AST_WHILE, $3, $5); }
| T_DO statement T_WHILE '(' expr ')' ';'
{ $$ = zend_ast_create(ZEND_AST_DO_WHILE, $2, $5); }
| T_FOR '(' for_exprs ';' for_exprs ';' for_exprs ')' for_statement
{ $$ = zend_ast_create(ZEND_AST_FOR, $3, $5, $7, $9); }
| T_SWITCH '(' expr ')' switch_case_list
{ $$ = zend_ast_create(ZEND_AST_SWITCH, $3, $5); }
| T_BREAK optional_expr ';' { $$ = zend_ast_create(ZEND_AST_BREAK, $2); }
| T_CONTINUE optional_expr ';' { $$ = zend_ast_create(ZEND_AST_CONTINUE, $2); }
| T_RETURN optional_expr ';' { $$ = zend_ast_create(ZEND_AST_RETURN, $2); }
| T_GLOBAL global_var_list ';' { $$ = $2; }
| T_STATIC static_var_list ';' { $$ = $2; }
| T_ECHO echo_expr_list ';' { $$ = $2; }
| T_INLINE_HTML { $$ = zend_ast_create(ZEND_AST_ECHO, $1); }
| expr ';' { $$ = $1; }
| T_UNSET '(' unset_variables ')' ';' { $$ = $3; }
| T_FOREACH '(' expr T_AS foreach_variable ')' foreach_statement
{ $$ = zend_ast_create(ZEND_AST_FOREACH, $3, $5, NULL, $7); }
| T_FOREACH '(' expr T_AS foreach_variable T_DOUBLE_ARROW foreach_variable ')'
foreach_statement
{ $$ = zend_ast_create(ZEND_AST_FOREACH, $3, $7, $5, $9); }
| T_DECLARE '(' const_list ')'
{ zend_handle_encoding_declaration($3); }
declare_statement
{ $$ = zend_ast_create(ZEND_AST_DECLARE, $3, $6); }
| ';' /* empty statement */ { $$ = NULL; }
| T_TRY '{' inner_statement_list '}' catch_list finally_statement
{ $$ = zend_ast_create(ZEND_AST_TRY, $3, $5, $6); }
| T_THROW expr ';' { $$ = zend_ast_create(ZEND_AST_THROW, $2); }
| T_GOTO T_STRING ';' { $$ = zend_ast_create(ZEND_AST_GOTO, $2); }
| T_STRING ':' { $$ = zend_ast_create(ZEND_AST_LABEL, $1); }
;
catch_list:
/* empty */
{ $$ = zend_ast_create_list(0, ZEND_AST_CATCH_LIST); }
| catch_list T_CATCH '(' name T_VARIABLE ')' '{' inner_statement_list '}'
{ $$ = zend_ast_list_add($1, zend_ast_create(ZEND_AST_CATCH, $4, $5, $8)); }
;
finally_statement:
/* empty */ { $$ = NULL; }
| T_FINALLY '{' inner_statement_list '}' { $$ = $3; }
;
unset_variables:
unset_variable { $$ = zend_ast_create_list(1, ZEND_AST_STMT_LIST, $1); }
| unset_variables ',' unset_variable { $$ = zend_ast_list_add($1, $3); }
;
unset_variable:
variable { $$ = zend_ast_create(ZEND_AST_UNSET, $1); }
;
function_declaration_statement:
function returns_ref T_STRING '(' parameter_list ')' return_type
backup_doc_comment '{' inner_statement_list '}'
{ $$ = zend_ast_create_decl(ZEND_AST_FUNC_DECL, $2, $1, $8,
zend_ast_get_str($3), $5, NULL, $10, $7); }
;
is_reference:
/* empty */ { $$ = 0; }
| '&' { $$ = ZEND_PARAM_REF; }
;
is_variadic:
/* empty */ { $$ = 0; }
| T_ELLIPSIS { $$ = ZEND_PARAM_VARIADIC; }
;
class_declaration_statement:
class_modifiers T_CLASS { $<num>$ = CG(zend_lineno); }
T_STRING extends_from implements_list backup_doc_comment '{' class_statement_list '}'
{ $$ = zend_ast_create_decl(ZEND_AST_CLASS, $1, $<num>3, $7, zend_ast_get_str($4), $5, $6, $9, NULL); }
| T_CLASS { $<num>$ = CG(zend_lineno); }
T_STRING extends_from implements_list backup_doc_comment '{' class_statement_list '}'
{ $$ = zend_ast_create_decl(ZEND_AST_CLASS, 0, $<num>2, $6, zend_ast_get_str($3), $4, $5, $8, NULL); }
;
class_modifiers:
class_modifier { $$ = $1; }
| class_modifiers class_modifier { $$ = zend_add_class_modifier($1, $2); }
;
class_modifier:
T_ABSTRACT { $$ = ZEND_ACC_EXPLICIT_ABSTRACT_CLASS; }
| T_FINAL { $$ = ZEND_ACC_FINAL; }
;
trait_declaration_statement:
T_TRAIT { $<num>$ = CG(zend_lineno); }
T_STRING backup_doc_comment '{' class_statement_list '}'
{ $$ = zend_ast_create_decl(ZEND_AST_CLASS, ZEND_ACC_TRAIT, $<num>2, $4, zend_ast_get_str($3), NULL, NULL, $6, NULL); }
;
interface_declaration_statement:
T_INTERFACE { $<num>$ = CG(zend_lineno); }
T_STRING interface_extends_list backup_doc_comment '{' class_statement_list '}'
{ $$ = zend_ast_create_decl(ZEND_AST_CLASS, ZEND_ACC_INTERFACE, $<num>2, $5, zend_ast_get_str($3), NULL, $4, $7, NULL); }
;
extends_from:
/* empty */ { $$ = NULL; }
| T_EXTENDS name { $$ = $2; }
;
interface_extends_list:
/* empty */ { $$ = NULL; }
| T_EXTENDS name_list { $$ = $2; }
;
implements_list:
/* empty */ { $$ = NULL; }
| T_IMPLEMENTS name_list { $$ = $2; }
;
foreach_variable:
variable { $$ = $1; }
| '&' variable { $$ = zend_ast_create(ZEND_AST_REF, $2); }
| T_LIST '(' assignment_list ')' { $$ = $3; }
;
for_statement:
statement { $$ = $1; }
| ':' inner_statement_list T_ENDFOR ';' { $$ = $2; }
;
foreach_statement:
statement { $$ = $1; }
| ':' inner_statement_list T_ENDFOREACH ';' { $$ = $2; }
;
declare_statement:
statement { $$ = $1; }
| ':' inner_statement_list T_ENDDECLARE ';' { $$ = $2; }
;
switch_case_list:
'{' case_list '}' { $$ = $2; }
| '{' ';' case_list '}' { $$ = $3; }
| ':' case_list T_ENDSWITCH ';' { $$ = $2; }
| ':' ';' case_list T_ENDSWITCH ';' { $$ = $3; }
;
case_list:
/* empty */ { $$ = zend_ast_create_list(0, ZEND_AST_SWITCH_LIST); }
| case_list T_CASE expr case_separator inner_statement_list
{ $$ = zend_ast_list_add($1, zend_ast_create(ZEND_AST_SWITCH_CASE, $3, $5)); }
| case_list T_DEFAULT case_separator inner_statement_list
{ $$ = zend_ast_list_add($1, zend_ast_create(ZEND_AST_SWITCH_CASE, NULL, $4)); }
;
case_separator:
':'
| ';'
;
while_statement:
statement { $$ = $1; }
| ':' inner_statement_list T_ENDWHILE ';' { $$ = $2; }
;
if_stmt_without_else:
T_IF '(' expr ')' statement
{ $$ = zend_ast_create_list(1, ZEND_AST_IF,
zend_ast_create(ZEND_AST_IF_ELEM, $3, $5)); }
| if_stmt_without_else T_ELSEIF '(' expr ')' statement
{ $$ = zend_ast_list_add($1,
zend_ast_create(ZEND_AST_IF_ELEM, $4, $6)); }
;
if_stmt:
if_stmt_without_else %prec T_NOELSE { $$ = $1; }
| if_stmt_without_else T_ELSE statement
{ $$ = zend_ast_list_add($1, zend_ast_create(ZEND_AST_IF_ELEM, NULL, $3)); }
;
alt_if_stmt_without_else:
T_IF '(' expr ')' ':' inner_statement_list
{ $$ = zend_ast_create_list(1, ZEND_AST_IF,
zend_ast_create(ZEND_AST_IF_ELEM, $3, $6)); }
| alt_if_stmt_without_else T_ELSEIF '(' expr ')' ':' inner_statement_list
{ $$ = zend_ast_list_add($1,
zend_ast_create(ZEND_AST_IF_ELEM, $4, $7)); }
;
alt_if_stmt:
alt_if_stmt_without_else T_ENDIF ';' { $$ = $1; }
| alt_if_stmt_without_else T_ELSE ':' inner_statement_list T_ENDIF ';'
{ $$ = zend_ast_list_add($1,
zend_ast_create(ZEND_AST_IF_ELEM, NULL, $4)); }
;
parameter_list:
non_empty_parameter_list { $$ = $1; }
| /* empty */ { $$ = zend_ast_create_list(0, ZEND_AST_PARAM_LIST); }
;
non_empty_parameter_list:
parameter
{ $$ = zend_ast_create_list(1, ZEND_AST_PARAM_LIST, $1); }
| non_empty_parameter_list ',' parameter
{ $$ = zend_ast_list_add($1, $3); }
;
parameter:
optional_type is_reference is_variadic T_VARIABLE
{ $$ = zend_ast_create_ex(ZEND_AST_PARAM, $2 | $3, $1, $4, NULL); }
| optional_type is_reference is_variadic T_VARIABLE '=' expr
{ $$ = zend_ast_create_ex(ZEND_AST_PARAM, $2 | $3, $1, $4, $6); }
;
optional_type:
/* empty */ { $$ = NULL; }
| type { $$ = $1; }
;
type:
T_ARRAY { $$ = zend_ast_create_ex(ZEND_AST_TYPE, IS_ARRAY); }
| T_CALLABLE { $$ = zend_ast_create_ex(ZEND_AST_TYPE, IS_CALLABLE); }
| name { $$ = $1; }
;
return_type:
/* empty */ { $$ = NULL; }
| ':' type { $$ = $2; }
;
argument_list:
'(' ')' { $$ = zend_ast_create_list(0, ZEND_AST_ARG_LIST); }
| '(' non_empty_argument_list ')' { $$ = $2; }
;
non_empty_argument_list:
argument
{ $$ = zend_ast_create_list(1, ZEND_AST_ARG_LIST, $1); }
| non_empty_argument_list ',' argument
{ $$ = zend_ast_list_add($1, $3); }
;
argument:
expr { $$ = $1; }
| T_ELLIPSIS expr { $$ = zend_ast_create(ZEND_AST_UNPACK, $2); }
;
global_var_list:
global_var_list ',' global_var { $$ = zend_ast_list_add($1, $3); }
| global_var { $$ = zend_ast_create_list(1, ZEND_AST_STMT_LIST, $1); }
;
global_var:
simple_variable
{ $$ = zend_ast_create(ZEND_AST_GLOBAL, zend_ast_create(ZEND_AST_VAR, $1)); }
;
static_var_list:
static_var_list ',' static_var { $$ = zend_ast_list_add($1, $3); }
| static_var { $$ = zend_ast_create_list(1, ZEND_AST_STMT_LIST, $1); }
;
static_var:
T_VARIABLE { $$ = zend_ast_create(ZEND_AST_STATIC, $1, NULL); }
| T_VARIABLE '=' expr { $$ = zend_ast_create(ZEND_AST_STATIC, $1, $3); }
;
class_statement_list:
class_statement_list class_statement
{ $$ = zend_ast_list_add($1, $2); }
| /* empty */
{ $$ = zend_ast_create_list(0, ZEND_AST_STMT_LIST); }
;
class_statement:
variable_modifiers property_list ';'
{ $$ = $2; $$->attr = $1; }
| T_CONST class_const_list ';'
{ $$ = $2; RESET_DOC_COMMENT(); }
| T_USE name_list trait_adaptations
{ $$ = zend_ast_create(ZEND_AST_USE_TRAIT, $2, $3); }
| method_modifiers function returns_ref identifier '(' parameter_list ')'
return_type backup_doc_comment method_body
{ $$ = zend_ast_create_decl(ZEND_AST_METHOD, $3 | $1, $2, $9,
zend_ast_get_str($4), $6, NULL, $10, $8); }
;
name_list:
name { $$ = zend_ast_create_list(1, ZEND_AST_NAME_LIST, $1); }
| name_list ',' name { $$ = zend_ast_list_add($1, $3); }
;
trait_adaptations:
';' { $$ = NULL; }
| '{' '}' { $$ = NULL; }
| '{' trait_adaptation_list '}' { $$ = $2; }
;
trait_adaptation_list:
trait_adaptation
{ $$ = zend_ast_create_list(1, ZEND_AST_TRAIT_ADAPTATIONS, $1); }
| trait_adaptation_list trait_adaptation
{ $$ = zend_ast_list_add($1, $2); }
;
trait_adaptation:
trait_precedence ';' { $$ = $1; }
| trait_alias ';' { $$ = $1; }
;
trait_precedence:
absolute_trait_method_reference T_INSTEADOF name_list
{ $$ = zend_ast_create(ZEND_AST_TRAIT_PRECEDENCE, $1, $3); }
;
trait_alias:
trait_method_reference T_AS T_STRING
{ $$ = zend_ast_create_ex(ZEND_AST_TRAIT_ALIAS, 0, $1, $3); }
| trait_method_reference T_AS reserved_non_modifiers
{ zval zv; zend_lex_tstring(&zv); $$ = zend_ast_create_ex(ZEND_AST_TRAIT_ALIAS, 0, $1, zend_ast_create_zval(&zv)); }
| trait_method_reference T_AS member_modifier identifier
{ $$ = zend_ast_create_ex(ZEND_AST_TRAIT_ALIAS, $3, $1, $4); }
| trait_method_reference T_AS member_modifier
{ $$ = zend_ast_create_ex(ZEND_AST_TRAIT_ALIAS, $3, $1, NULL); }
;
trait_method_reference:
identifier
{ $$ = zend_ast_create(ZEND_AST_METHOD_REFERENCE, NULL, $1); }
| absolute_trait_method_reference { $$ = $1; }
;
absolute_trait_method_reference:
name T_PAAMAYIM_NEKUDOTAYIM identifier
{ $$ = zend_ast_create(ZEND_AST_METHOD_REFERENCE, $1, $3); }
;
method_body:
';' /* abstract method */ { $$ = NULL; }
| '{' inner_statement_list '}' { $$ = $2; }
;
variable_modifiers:
non_empty_member_modifiers { $$ = $1; }
| T_VAR { $$ = ZEND_ACC_PUBLIC; }
;
method_modifiers:
/* empty */ { $$ = ZEND_ACC_PUBLIC; }
| non_empty_member_modifiers
{ $$ = $1; if (!($$ & ZEND_ACC_PPP_MASK)) { $$ |= ZEND_ACC_PUBLIC; } }
;
non_empty_member_modifiers:
member_modifier { $$ = $1; }
| non_empty_member_modifiers member_modifier
{ $$ = zend_add_member_modifier($1, $2); }
;
member_modifier:
T_PUBLIC { $$ = ZEND_ACC_PUBLIC; }
| T_PROTECTED { $$ = ZEND_ACC_PROTECTED; }
| T_PRIVATE { $$ = ZEND_ACC_PRIVATE; }
| T_STATIC { $$ = ZEND_ACC_STATIC; }
| T_ABSTRACT { $$ = ZEND_ACC_ABSTRACT; }
| T_FINAL { $$ = ZEND_ACC_FINAL; }
;
property_list:
property_list ',' property { $$ = zend_ast_list_add($1, $3); }
| property { $$ = zend_ast_create_list(1, ZEND_AST_PROP_DECL, $1); }
;
property:
T_VARIABLE backup_doc_comment
{ $$ = zend_ast_create(ZEND_AST_PROP_ELEM, $1, NULL, ($2 ? zend_ast_create_zval_from_str($2) : NULL)); }
| T_VARIABLE '=' expr backup_doc_comment
{ $$ = zend_ast_create(ZEND_AST_PROP_ELEM, $1, $3, ($4 ? zend_ast_create_zval_from_str($4) : NULL)); }
;
class_const_list:
class_const_list ',' class_const_decl { $$ = zend_ast_list_add($1, $3); }
| class_const_decl { $$ = zend_ast_create_list(1, ZEND_AST_CLASS_CONST_DECL, $1); }
;
class_const_decl:
identifier '=' expr { $$ = zend_ast_create(ZEND_AST_CONST_ELEM, $1, $3); }
;
const_decl:
T_STRING '=' expr { $$ = zend_ast_create(ZEND_AST_CONST_ELEM, $1, $3); }
;
echo_expr_list:
echo_expr_list ',' echo_expr { $$ = zend_ast_list_add($1, $3); }
| echo_expr { $$ = zend_ast_create_list(1, ZEND_AST_STMT_LIST, $1); }
;
echo_expr:
expr { $$ = zend_ast_create(ZEND_AST_ECHO, $1); }
;
for_exprs:
/* empty */ { $$ = NULL; }
| non_empty_for_exprs { $$ = $1; }
;
non_empty_for_exprs:
non_empty_for_exprs ',' expr { $$ = zend_ast_list_add($1, $3); }
| expr { $$ = zend_ast_create_list(1, ZEND_AST_EXPR_LIST, $1); }
;
anonymous_class:
T_CLASS { $<num>$ = CG(zend_lineno); } ctor_arguments
extends_from implements_list backup_doc_comment '{' class_statement_list '}' {
zend_ast *decl = zend_ast_create_decl(
ZEND_AST_CLASS, ZEND_ACC_ANON_CLASS, $<num>2, $6, NULL,
$4, $5, $8, NULL);
$$ = zend_ast_create(ZEND_AST_NEW, decl, $3);
}
;
new_expr:
T_NEW class_name_reference ctor_arguments
{ $$ = zend_ast_create(ZEND_AST_NEW, $2, $3); }
| T_NEW anonymous_class
{ $$ = $2; }
;
expr_without_variable:
T_LIST '(' assignment_list ')' '=' expr
{ $$ = zend_ast_create(ZEND_AST_ASSIGN, $3, $6); }
| variable '=' expr
{ $$ = zend_ast_create(ZEND_AST_ASSIGN, $1, $3); }
| variable '=' '&' variable
{ $$ = zend_ast_create(ZEND_AST_ASSIGN_REF, $1, $4); }
| T_CLONE expr { $$ = zend_ast_create(ZEND_AST_CLONE, $2); }
| variable T_PLUS_EQUAL expr
{ $$ = zend_ast_create_assign_op(ZEND_ASSIGN_ADD, $1, $3); }
| variable T_MINUS_EQUAL expr
{ $$ = zend_ast_create_assign_op(ZEND_ASSIGN_SUB, $1, $3); }
| variable T_MUL_EQUAL expr
{ $$ = zend_ast_create_assign_op(ZEND_ASSIGN_MUL, $1, $3); }
| variable T_POW_EQUAL expr
{ $$ = zend_ast_create_assign_op(ZEND_ASSIGN_POW, $1, $3); }
| variable T_DIV_EQUAL expr
{ $$ = zend_ast_create_assign_op(ZEND_ASSIGN_DIV, $1, $3); }
| variable T_CONCAT_EQUAL expr
{ $$ = zend_ast_create_assign_op(ZEND_ASSIGN_CONCAT, $1, $3); }
| variable T_MOD_EQUAL expr
{ $$ = zend_ast_create_assign_op(ZEND_ASSIGN_MOD, $1, $3); }
| variable T_AND_EQUAL expr
{ $$ = zend_ast_create_assign_op(ZEND_ASSIGN_BW_AND, $1, $3); }
| variable T_OR_EQUAL expr
{ $$ = zend_ast_create_assign_op(ZEND_ASSIGN_BW_OR, $1, $3); }
| variable T_XOR_EQUAL expr
{ $$ = zend_ast_create_assign_op(ZEND_ASSIGN_BW_XOR, $1, $3); }
| variable T_SL_EQUAL 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_INC { $$ = zend_ast_create(ZEND_AST_POST_INC, $1); }
| T_INC variable { $$ = zend_ast_create(ZEND_AST_PRE_INC, $2); }
| variable T_DEC { $$ = zend_ast_create(ZEND_AST_POST_DEC, $1); }
| T_DEC variable { $$ = zend_ast_create(ZEND_AST_PRE_DEC, $2); }
| expr T_BOOLEAN_OR expr
{ $$ = zend_ast_create(ZEND_AST_OR, $1, $3); }
| expr T_BOOLEAN_AND expr
{ $$ = zend_ast_create(ZEND_AST_AND, $1, $3); }
| expr T_LOGICAL_OR expr
{ $$ = zend_ast_create(ZEND_AST_OR, $1, $3); }
| expr T_LOGICAL_AND expr
{ $$ = zend_ast_create(ZEND_AST_AND, $1, $3); }
| expr T_LOGICAL_XOR expr
{ $$ = zend_ast_create_binary_op(ZEND_BOOL_XOR, $1, $3); }
| expr '|' expr { $$ = zend_ast_create_binary_op(ZEND_BW_OR, $1, $3); }
| expr '&' expr { $$ = zend_ast_create_binary_op(ZEND_BW_AND, $1, $3); }
| expr '^' expr { $$ = zend_ast_create_binary_op(ZEND_BW_XOR, $1, $3); }
| expr '.' expr { $$ = zend_ast_create_binary_op(ZEND_CONCAT, $1, $3); }
| expr '+' expr { $$ = zend_ast_create_binary_op(ZEND_ADD, $1, $3); }
| expr '-' expr { $$ = zend_ast_create_binary_op(ZEND_SUB, $1, $3); }
| expr '*' expr { $$ = zend_ast_create_binary_op(ZEND_MUL, $1, $3); }
| expr T_POW expr { $$ = zend_ast_create_binary_op(ZEND_POW, $1, $3); }
| expr '/' expr { $$ = zend_ast_create_binary_op(ZEND_DIV, $1, $3); }
| expr '%' expr { $$ = zend_ast_create_binary_op(ZEND_MOD, $1, $3); }
| expr T_SL expr { $$ = zend_ast_create_binary_op(ZEND_SL, $1, $3); }
| expr T_SR expr { $$ = zend_ast_create_binary_op(ZEND_SR, $1, $3); }
| '+' expr %prec T_INC { $$ = zend_ast_create(ZEND_AST_UNARY_PLUS, $2); }
| '-' expr %prec T_INC { $$ = zend_ast_create(ZEND_AST_UNARY_MINUS, $2); }
| '!' expr { $$ = zend_ast_create_ex(ZEND_AST_UNARY_OP, ZEND_BOOL_NOT, $2); }
| '~' expr { $$ = zend_ast_create_ex(ZEND_AST_UNARY_OP, ZEND_BW_NOT, $2); }
| expr T_IS_IDENTICAL expr
{ $$ = zend_ast_create_binary_op(ZEND_IS_IDENTICAL, $1, $3); }
| expr T_IS_NOT_IDENTICAL expr
{ $$ = zend_ast_create_binary_op(ZEND_IS_NOT_IDENTICAL, $1, $3); }
| expr T_IS_EQUAL expr
{ $$ = zend_ast_create_binary_op(ZEND_IS_EQUAL, $1, $3); }
| expr T_IS_NOT_EQUAL expr
{ $$ = zend_ast_create_binary_op(ZEND_IS_NOT_EQUAL, $1, $3); }
| expr '<' expr
{ $$ = zend_ast_create_binary_op(ZEND_IS_SMALLER, $1, $3); }
| expr T_IS_SMALLER_OR_EQUAL expr
{ $$ = zend_ast_create_binary_op(ZEND_IS_SMALLER_OR_EQUAL, $1, $3); }
| expr '>' expr
{ $$ = zend_ast_create(ZEND_AST_GREATER, $1, $3); }
| expr T_IS_GREATER_OR_EQUAL expr
{ $$ = zend_ast_create(ZEND_AST_GREATER_EQUAL, $1, $3); }
| expr T_SPACESHIP expr
{ $$ = zend_ast_create_binary_op(ZEND_SPACESHIP, $1, $3); }
| expr T_INSTANCEOF class_name_reference
{ $$ = zend_ast_create(ZEND_AST_INSTANCEOF, $1, $3); }
| '(' expr ')' { $$ = $2; }
| new_expr { $$ = $1; }
| expr '?' expr ':' expr
{ $$ = zend_ast_create(ZEND_AST_CONDITIONAL, $1, $3, $5); }
| expr '?' ':' expr
{ $$ = zend_ast_create(ZEND_AST_CONDITIONAL, $1, NULL, $4); }
| expr T_COALESCE expr
{ $$ = zend_ast_create(ZEND_AST_COALESCE, $1, $3); }
| internal_functions_in_yacc { $$ = $1; }
| T_INT_CAST expr { $$ = zend_ast_create_cast(IS_LONG, $2); }
| T_DOUBLE_CAST expr { $$ = zend_ast_create_cast(IS_DOUBLE, $2); }
| T_STRING_CAST expr { $$ = zend_ast_create_cast(IS_STRING, $2); }
| T_ARRAY_CAST expr { $$ = zend_ast_create_cast(IS_ARRAY, $2); }
| T_OBJECT_CAST expr { $$ = zend_ast_create_cast(IS_OBJECT, $2); }
| T_BOOL_CAST expr { $$ = zend_ast_create_cast(_IS_BOOL, $2); }
| T_UNSET_CAST expr { $$ = zend_ast_create_cast(IS_NULL, $2); }
| T_EXIT exit_expr { $$ = zend_ast_create(ZEND_AST_EXIT, $2); }
| '@' expr { $$ = zend_ast_create(ZEND_AST_SILENCE, $2); }
| scalar { $$ = $1; }
| '`' backticks_expr '`' { $$ = zend_ast_create(ZEND_AST_SHELL_EXEC, $2); }
| T_PRINT expr { $$ = zend_ast_create(ZEND_AST_PRINT, $2); }
| T_YIELD { $$ = zend_ast_create(ZEND_AST_YIELD, NULL, NULL); }
| T_YIELD expr { $$ = zend_ast_create(ZEND_AST_YIELD, $2, NULL); }
| T_YIELD expr T_DOUBLE_ARROW expr { $$ = zend_ast_create(ZEND_AST_YIELD, $4, $2); }
| T_YIELD_FROM expr { $$ = zend_ast_create(ZEND_AST_YIELD_FROM, $2); }
| function returns_ref '(' parameter_list ')' lexical_vars return_type
backup_doc_comment '{' inner_statement_list '}'
{ $$ = zend_ast_create_decl(ZEND_AST_CLOSURE, $2, $1, $8,
zend_string_init("{closure}", sizeof("{closure}") - 1, 0),
$4, $6, $10, $7); }
| T_STATIC function returns_ref '(' parameter_list ')' lexical_vars
return_type backup_doc_comment '{' inner_statement_list '}'
{ $$ = zend_ast_create_decl(ZEND_AST_CLOSURE, $3 | ZEND_ACC_STATIC, $2, $9,
zend_string_init("{closure}", sizeof("{closure}") - 1, 0),
$5, $7, $11, $8); }
;
function:
T_FUNCTION { $$ = CG(zend_lineno); }
;
backup_doc_comment:
/* empty */ { $$ = CG(doc_comment); CG(doc_comment) = NULL; }
;
returns_ref:
/* empty */ { $$ = 0; }
| '&' { $$ = ZEND_ACC_RETURN_REFERENCE; }
;
lexical_vars:
/* empty */ { $$ = NULL; }
| T_USE '(' lexical_var_list ')' { $$ = $3; }
;
lexical_var_list:
lexical_var_list ',' lexical_var { $$ = zend_ast_list_add($1, $3); }
| lexical_var { $$ = zend_ast_create_list(1, ZEND_AST_CLOSURE_USES, $1); }
;
lexical_var:
T_VARIABLE { $$ = $1; }
| '&' T_VARIABLE { $$ = $2; $$->attr = 1; }
;