xref: /PHP-7.2/Zend/zend_iterators.h (revision 7a7ec01a)
1 /*
2    +----------------------------------------------------------------------+
3    | Zend Engine                                                          |
4    +----------------------------------------------------------------------+
5    | Copyright (c) 1998-2018 Zend Technologies Ltd. (http://www.zend.com) |
6    +----------------------------------------------------------------------+
7    | This source file is subject to version 2.00 of the Zend license,     |
8    | that is bundled with this package in the file LICENSE, and is        |
9    | available through the world-wide-web at the following url:           |
10    | http://www.zend.com/license/2_00.txt.                                |
11    | If you did not receive a copy of the Zend license and are unable to  |
12    | obtain it through the world-wide-web, please send a note to          |
13    | license@zend.com so we can mail you a copy immediately.              |
14    +----------------------------------------------------------------------+
15    | Author: Wez Furlong <wez@thebrainroom.com>                           |
16    |         Marcus Boerger <helly@php.net>                               |
17    +----------------------------------------------------------------------+
18 */
19 
20 /* $Id$ */
21 
22 /* These iterators were designed to operate within the foreach()
23  * structures provided by the engine, but could be extended for use
24  * with other iterative engine opcodes.
25  * These methods have similar semantics to the zend_hash API functions
26  * with similar names.
27  * */
28 
29 typedef struct _zend_object_iterator zend_object_iterator;
30 
31 typedef struct _zend_object_iterator_funcs {
32 	/* release all resources associated with this iterator instance */
33 	void (*dtor)(zend_object_iterator *iter);
34 
35 	/* check for end of iteration (FAILURE or SUCCESS if data is valid) */
36 	int (*valid)(zend_object_iterator *iter);
37 
38 	/* fetch the item data for the current element */
39 	zval *(*get_current_data)(zend_object_iterator *iter);
40 
41 	/* fetch the key for the current element (optional, may be NULL). The key
42 	 * should be written into the provided zval* using the ZVAL_* macros. If
43 	 * this handler is not provided auto-incrementing integer keys will be
44 	 * used. */
45 	void (*get_current_key)(zend_object_iterator *iter, zval *key);
46 
47 	/* step forwards to next element */
48 	void (*move_forward)(zend_object_iterator *iter);
49 
50 	/* rewind to start of data (optional, may be NULL) */
51 	void (*rewind)(zend_object_iterator *iter);
52 
53 	/* invalidate current value/key (optional, may be NULL) */
54 	void (*invalidate_current)(zend_object_iterator *iter);
55 } zend_object_iterator_funcs;
56 
57 struct _zend_object_iterator {
58 	zend_object std;
59 	zval data;
60 	zend_object_iterator_funcs *funcs;
61 	zend_ulong index; /* private to fe_reset/fe_fetch opcodes */
62 };
63 
64 typedef struct _zend_class_iterator_funcs {
65 	zend_object_iterator_funcs  *funcs;
66 	union _zend_function *zf_new_iterator;
67 	union _zend_function *zf_valid;
68 	union _zend_function *zf_current;
69 	union _zend_function *zf_key;
70 	union _zend_function *zf_next;
71 	union _zend_function *zf_rewind;
72 } zend_class_iterator_funcs;
73 
74 BEGIN_EXTERN_C()
75 /* given a zval, returns stuff that can be used to iterate it. */
76 ZEND_API zend_object_iterator* zend_iterator_unwrap(zval *array_ptr);
77 
78 /* given an iterator, wrap it up as a zval for use by the engine opcodes */
79 ZEND_API void zend_iterator_init(zend_object_iterator *iter);
80 ZEND_API void zend_iterator_dtor(zend_object_iterator *iter);
81 
82 ZEND_API void zend_register_iterator_wrapper(void);
83 END_EXTERN_C()
84 
85 /*
86  * Local variables:
87  * tab-width: 4
88  * c-basic-offset: 4
89  * indent-tabs-mode: t
90  * End:
91  * vim600: sw=4 ts=4 fdm=marker
92  * vim<600: sw=4 ts=4
93  */
94