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json.php

Last change on this file was 483, checked in by hendrikvanantwerpen, 11 years ago
Added Dojo 1.9.3 release.
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1	<?php
2	/* vim: set expandtab tabstop=4 shiftwidth=4 softtabstop=4: */
3
4	/**
5	* Converts to and from JSON format.
6	*
7	* JSON (JavaScript Object Notation) is a lightweight data-interchange
8	* format. It is easy for humans to read and write. It is easy for machines
9	* to parse and generate. It is based on a subset of the JavaScript
10	* Programming Language, Standard ECMA-262 3rd Edition - December 1999.
11	* This feature can also be found in Python. JSON is a text format that is
12	* completely language independent but uses conventions that are familiar
13	* to programmers of the C-family of languages, including C, C++, C#, Java,
14	* JavaScript, Perl, TCL, and many others. These properties make JSON an
15	* ideal data-interchange language.
16	*
17	* This package provides a simple encoder and decoder for JSON notation. It
18	* is intended for use with client-side Javascript applications that make
19	* use of HTTPRequest to perform server communication functions - data can
20	* be encoded into JSON notation for use in a client-side javascript, or
21	* decoded from incoming Javascript requests. JSON format is native to
22	* Javascript, and can be directly eval()'ed with no further parsing
23	* overhead
24	*
25	* All strings should be in ASCII or UTF-8 format!
26	*
27	* LICENSE: Redistribution and use in source and binary forms, with or
28	* without modification, are permitted provided that the following
29	* conditions are met: Redistributions of source code must retain the
30	* above copyright notice, this list of conditions and the following
31	* disclaimer. Redistributions in binary form must reproduce the above
32	* copyright notice, this list of conditions and the following disclaimer
33	* in the documentation and/or other materials provided with the
34	* distribution.
35	*
36	* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
37	* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
38	* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN
39	* NO EVENT SHALL CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
40	* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
41	* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
42	* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
43	* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR
44	* TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE
45	* USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH
46	* DAMAGE.
47	*
48	* @category
49	* @package Services_JSON
50	* @author Michal Migurski <mike-json@teczno.com>
51	* @author Matt Knapp <mdknapp[at]gmail[dot]com>
52	* @author Brett Stimmerman <brettstimmerman[at]gmail[dot]com>
53	* @copyright 2005 Michal Migurski
54	* @license http://www.opensource.org/licenses/bsd-license.php
55	* @link http://pear.php.net/pepr/pepr-proposal-show.php?id=198
56	*/
57
58	/**
59	* Marker constant for Services_JSON::decode(), used to flag stack state
60	*/
61	define('SERVICES_JSON_SLICE', 1);
62
63	/**
64	* Marker constant for Services_JSON::decode(), used to flag stack state
65	*/
66	define('SERVICES_JSON_IN_STR', 2);
67
68	/**
69	* Marker constant for Services_JSON::decode(), used to flag stack state
70	*/
71	define('SERVICES_JSON_IN_ARR', 4);
72
73	/**
74	* Marker constant for Services_JSON::decode(), used to flag stack state
75	*/
76	define('SERVICES_JSON_IN_OBJ', 8);
77
78	/**
79	* Marker constant for Services_JSON::decode(), used to flag stack state
80	*/
81	define('SERVICES_JSON_IN_CMT', 16);
82
83	/**
84	* Behavior switch for Services_JSON::decode()
85	*/
86	define('SERVICES_JSON_LOOSE_TYPE', 10);
87
88	/**
89	* Behavior switch for Services_JSON::decode()
90	*/
91	define('SERVICES_JSON_STRICT_TYPE', 11);
92
93	/**
94	* Encodings
95	*/
96	define('SERVICES_JSON_ISO_8859_1', 'iso-8859-1');
97	define('SERVICES_JSON_UTF_8', 'utf-8');
98
99	/**
100	* Converts to and from JSON format.
101	*
102	* Brief example of use:
103	*
104	* <code>
105	* // create a new instance of Services_JSON
106	* $json = new Services_JSON();
107	*
108	* // convert a complexe value to JSON notation, and send it to the browser
109	* $value = array('foo', 'bar', array(1, 2, 'baz'), array(3, array(4)));
110	* $output = $json->encode($value);
111	*
112	* print($output);
113	* // prints: ["foo","bar",[1,2,"baz"],[3,[4]]]
114	*
115	* // accept incoming POST data, assumed to be in JSON notation
116	* $input = file_get_contents('php://input', 1000000);
117	* $value = $json->decode($input);
118	* </code>
119	*/
120	class Services_JSON
121	{
122	/**
123	* constructs a new JSON instance
124	*
125	//>> SJM2005
126	* @param string $encoding Strings are input/output in this encoding
127	* @param int $encode Encode input is expected in this character encoding
128	//<< SJM2005
129	*
130	* @param int $use object behavior: when encoding or decoding,
131	* be loose or strict about object/array usage
132	*
133	* possible values:
134	* - SERVICES_JSON_STRICT_TYPE: strict typing, default.
135	* "{...}" syntax creates objects in decode().
136	* - SERVICES_JSON_LOOSE_TYPE: loose typing.
137	* "{...}" syntax creates associative arrays in decode().
138	*/
139	function Services_JSON($encoding = SERVICES_JSON_UTF_8, $use = SERVICES_JSON_STRICT_TYPE)
140	{
141	//>> SJM2005
142	$this->encoding = $encoding;
143	//<< SJM2005
144
145	$this->use = $use;
146	}
147
148	/**
149	* convert a string from one UTF-16 char to one UTF-8 char
150	*
151	* Normally should be handled by mb_convert_encoding, but
152	* provides a slower PHP-only method for installations
153	* that lack the multibye string extension.
154	*
155	* @param string $utf16 UTF-16 character
156	* @return string UTF-8 character
157	* @access private
158	*/
159	function utf162utf8($utf16)
160	{
161	// oh please oh please oh please oh please oh please
162	if(function_exists('mb_convert_encoding'))
163	return mb_convert_encoding($utf16, 'UTF-8', 'UTF-16');
164
165	$bytes = (ord($utf16{0}) << 8) \| ord($utf16{1});
166
167	switch(true) {
168	case ((0x7F & $bytes) == $bytes):
169	// this case should never be reached, because we are in ASCII range
170	// see: http://www.cl.cam.ac.uk/~mgk25/unicode.html#utf-8
171	return chr(0x7F & $bytes);
172
173	case (0x07FF & $bytes) == $bytes:
174	// return a 2-byte UTF-8 character
175	// see: http://www.cl.cam.ac.uk/~mgk25/unicode.html#utf-8
176	return chr(0xC0 \| (($bytes >> 6) & 0x1F))
177	. chr(0x80 \| ($bytes & 0x3F));
178
179	case (0xFFFF & $bytes) == $bytes:
180	// return a 3-byte UTF-8 character
181	// see: http://www.cl.cam.ac.uk/~mgk25/unicode.html#utf-8
182	return chr(0xE0 \| (($bytes >> 12) & 0x0F))
183	. chr(0x80 \| (($bytes >> 6) & 0x3F))
184	. chr(0x80 \| ($bytes & 0x3F));
185	}
186
187	// ignoring UTF-32 for now, sorry
188	return '';
189	}
190
191	/**
192	* convert a string from one UTF-8 char to one UTF-16 char
193	*
194	* Normally should be handled by mb_convert_encoding, but
195	* provides a slower PHP-only method for installations
196	* that lack the multibye string extension.
197	*
198	* @param string $utf8 UTF-8 character
199	* @return string UTF-16 character
200	* @access private
201	*/
202	function utf82utf16($utf8)
203	{
204	// oh please oh please oh please oh please oh please
205	if(function_exists('mb_convert_encoding'))
206	return mb_convert_encoding($utf8, 'UTF-16', 'UTF-8');
207
208	switch(strlen($utf8)) {
209	case 1:
210	// this case should never be reached, because we are in ASCII range
211	// see: http://www.cl.cam.ac.uk/~mgk25/unicode.html#utf-8
212	return $utf8;
213
214	case 2:
215	// return a UTF-16 character from a 2-byte UTF-8 char
216	// see: http://www.cl.cam.ac.uk/~mgk25/unicode.html#utf-8
217	return chr(0x07 & (ord($utf8{0}) >> 2))
218	. chr((0xC0 & (ord($utf8{0}) << 6))
219	\| (0x3F & ord($utf8{1})));
220
221	case 3:
222	// return a UTF-16 character from a 3-byte UTF-8 char
223	// see: http://www.cl.cam.ac.uk/~mgk25/unicode.html#utf-8
224	return chr((0xF0 & (ord($utf8{0}) << 4))
225	\| (0x0F & (ord($utf8{1}) >> 2)))
226	. chr((0xC0 & (ord($utf8{1}) << 6))
227	\| (0x7F & ord($utf8{2})));
228	}
229
230	// ignoring UTF-32 for now, sorry
231	return '';
232	}
233
234	/**
235	* encodes an arbitrary variable into JSON format
236	*
237	* @param mixed $var any number, boolean, string, array, or object to be encoded.
238	* see argument 1 to Services_JSON() above for array-parsing behavior.
239	* if var is a strng, note that encode() always expects it
240	* to be in ASCII or UTF-8 format!
241	*
242	* @return string JSON string representation of input var
243	* @access public
244	*/
245	function encode($var)
246	{
247	switch (gettype($var)) {
248	case 'boolean':
249	return $var ? 'true' : 'false';
250
251	case 'NULL':
252	return 'null';
253
254	case 'integer':
255	return (int) $var;
256
257	case 'double':
258	case 'float':
259	return (float) $var;
260
261	case 'string':
262	//>> SJM2005
263	if ($this->encoding == SERVICES_JSON_UTF_8)
264	;
265	else if ($this->encoding == SERVICES_JSON_ISO_8859_1)
266	$var = utf8_encode($var);
267	else if (!function_exists('mb_convert_encoding'))
268	die('Requested encoding requires mb_strings extension.');
269	else
270	$var = mb_convert_encoding($var, "utf-8", $this->encoding);
271	//<< SJM2005
272
273	// STRINGS ARE EXPECTED TO BE IN ASCII OR UTF-8 FORMAT
274	$ascii = '';
275	$strlen_var = strlen($var);
276
277	/*
278	* Iterate over every character in the string,
279	* escaping with a slash or encoding to UTF-8 where necessary
280	*/
281	for ($c = 0; $c < $strlen_var; ++$c) {
282
283	$ord_var_c = ord($var{$c});
284
285	switch (true) {
286	case $ord_var_c == 0x08:
287	$ascii .= '\b';
288	break;
289	case $ord_var_c == 0x09:
290	$ascii .= '\t';
291	break;
292	case $ord_var_c == 0x0A:
293	$ascii .= '\n';
294	break;
295	case $ord_var_c == 0x0C:
296	$ascii .= '\f';
297	break;
298	case $ord_var_c == 0x0D:
299	$ascii .= '\r';
300	break;
301
302	case $ord_var_c == 0x22:
303	case $ord_var_c == 0x2F:
304	case $ord_var_c == 0x5C:
305	// double quote, slash, slosh
306	$ascii .= '\\'.$var{$c};
307	break;
308
309	case (($ord_var_c >= 0x20) && ($ord_var_c <= 0x7F)):
310	// characters U-00000000 - U-0000007F (same as ASCII)
311	$ascii .= $var{$c};
312	break;
313
314	case (($ord_var_c & 0xE0) == 0xC0):
315	// characters U-00000080 - U-000007FF, mask 110XXXXX
316	// see http://www.cl.cam.ac.uk/~mgk25/unicode.html#utf-8
317	$char = pack('C*', $ord_var_c, ord($var{$c + 1}));
318	$c += 1;
319	$utf16 = $this->utf82utf16($char);
320	$ascii .= sprintf('\u%04s', bin2hex($utf16));
321	break;
322
323	case (($ord_var_c & 0xF0) == 0xE0):
324	// characters U-00000800 - U-0000FFFF, mask 1110XXXX
325	// see http://www.cl.cam.ac.uk/~mgk25/unicode.html#utf-8
326	$char = pack('C*', $ord_var_c,
327	ord($var{$c + 1}),
328	ord($var{$c + 2}));
329	$c += 2;
330	$utf16 = $this->utf82utf16($char);
331	$ascii .= sprintf('\u%04s', bin2hex($utf16));
332	break;
333
334	case (($ord_var_c & 0xF8) == 0xF0):
335	// characters U-00010000 - U-001FFFFF, mask 11110XXX
336	// see http://www.cl.cam.ac.uk/~mgk25/unicode.html#utf-8
337	$char = pack('C*', $ord_var_c,
338	ord($var{$c + 1}),
339	ord($var{$c + 2}),
340	ord($var{$c + 3}));
341	$c += 3;
342	$utf16 = $this->utf82utf16($char);
343	$ascii .= sprintf('\u%04s', bin2hex($utf16));
344	break;
345
346	case (($ord_var_c & 0xFC) == 0xF8):
347	// characters U-00200000 - U-03FFFFFF, mask 111110XX
348	// see http://www.cl.cam.ac.uk/~mgk25/unicode.html#utf-8
349	$char = pack('C*', $ord_var_c,
350	ord($var{$c + 1}),
351	ord($var{$c + 2}),
352	ord($var{$c + 3}),
353	ord($var{$c + 4}));
354	$c += 4;
355	$utf16 = $this->utf82utf16($char);
356	$ascii .= sprintf('\u%04s', bin2hex($utf16));
357	break;
358
359	case (($ord_var_c & 0xFE) == 0xFC):
360	// characters U-04000000 - U-7FFFFFFF, mask 1111110X
361	// see http://www.cl.cam.ac.uk/~mgk25/unicode.html#utf-8
362	$char = pack('C*', $ord_var_c,
363	ord($var{$c + 1}),
364	ord($var{$c + 2}),
365	ord($var{$c + 3}),
366	ord($var{$c + 4}),
367	ord($var{$c + 5}));
368	$c += 5;
369	$utf16 = $this->utf82utf16($char);
370	$ascii .= sprintf('\u%04s', bin2hex($utf16));
371	break;
372	}
373	}
374
375	return '"'.$ascii.'"';
376
377	case 'array':
378	/*
379	* As per JSON spec if any array key is not an integer
380	* we must treat the the whole array as an object. We
381	* also try to catch a sparsely populated associative
382	* array with numeric keys here because some JS engines
383	* will create an array with empty indexes up to
384	* max_index which can cause memory issues and because
385	* the keys, which may be relevant, will be remapped
386	* otherwise.
387	*
388	* As per the ECMA and JSON specification an object may
389	* have any string as a property. Unfortunately due to
390	* a hole in the ECMA specification if the key is a
391	* ECMA reserved word or starts with a digit the
392	* parameter is only accessible using ECMAScript's
393	* bracket notation.
394	*/
395
396	// treat as a JSON object
397	if (is_array($var) && count($var) && (array_keys($var) !== range(0, sizeof($var) - 1))) {
398	return '{' .
399	join(',', array_map(array($this, 'name_value'),
400	array_keys($var),
401	array_values($var)))
402	. '}';
403	}
404
405	// treat it like a regular array
406	return '[' . join(',', array_map(array($this, 'encode'), $var)) . ']';
407
408	case 'object':
409	$vars = get_object_vars($var);
410	return '{' .
411	join(',', array_map(array($this, 'name_value'),
412	array_keys($vars),
413	array_values($vars)))
414	. '}';
415
416	default:
417	return '';
418	}
419	}
420
421	/**
422	* array-walking function for use in generating JSON-formatted name-value pairs
423	*
424	* @param string $name name of key to use
425	* @param mixed $value reference to an array element to be encoded
426	*
427	* @return string JSON-formatted name-value pair, like '"name":value'
428	* @access private
429	*/
430	function name_value($name, $value)
431	{
432	return $this->encode(strval($name)) . ':' . $this->encode($value);
433	}
434
435	/**
436	* reduce a string by removing leading and trailing comments and whitespace
437	*
438	* @param $str string string value to strip of comments and whitespace
439	*
440	* @return string string value stripped of comments and whitespace
441	* @access private
442	*/
443	function reduce_string($str)
444	{
445	$str = preg_replace(array(
446
447	// eliminate single line comments in '// ...' form
448	'#^\s*//(.+)$#m',
449
450	// eliminate multi-line comments in '/* ... */' form, at start of string
451	'#^\s/\(.+)\*/#Us',
452
453	// eliminate multi-line comments in '/* ... */' form, at end of string
454	'#/\(.+)\/\s*$#Us'
455
456	), '', $str);
457
458	// eliminate extraneous space
459	return trim($str);
460	}
461
462	/**
463	* decodes a JSON string into appropriate variable
464	*
465	* @param string $str JSON-formatted string
466	*
467	* @return mixed number, boolean, string, array, or object
468	* corresponding to given JSON input string.
469	* See argument 1 to Services_JSON() above for object-output behavior.
470	* Note that decode() always returns strings
471	* in ASCII or UTF-8 format!
472	* @access public
473	*/
474	function decode($str)
475	{
476	$str = $this->reduce_string($str);
477
478	switch (strtolower($str)) {
479	case 'true':
480	return true;
481
482	case 'false':
483	return false;
484
485	case 'null':
486	return null;
487
488	default:
489	if (is_numeric($str)) {
490	// Lookie-loo, it's a number
491
492	// This would work on its own, but I'm trying to be
493	// good about returning integers where appropriate:
494	// return (float)$str;
495
496	// Return float or int, as appropriate
497	return ((float)$str == (integer)$str)
498	? (integer)$str
499	: (float)$str;
500
501	} elseif (preg_match('/^("\|\').+(\1)$/s', $str, $m) && $m[1] == $m[2]) {
502	// STRINGS RETURNED IN UTF-8 FORMAT
503	$delim = substr($str, 0, 1);
504	$chrs = substr($str, 1, -1);
505	$utf8 = '';
506	$strlen_chrs = strlen($chrs);
507
508	for ($c = 0; $c < $strlen_chrs; ++$c) {
509
510	$substr_chrs_c_2 = substr($chrs, $c, 2);
511	$ord_chrs_c = ord($chrs{$c});
512
513	switch (true) {
514	case $substr_chrs_c_2 == '\b':
515	$utf8 .= chr(0x08);
516	++$c;
517	break;
518	case $substr_chrs_c_2 == '\t':
519	$utf8 .= chr(0x09);
520	++$c;
521	break;
522	case $substr_chrs_c_2 == '\n':
523	$utf8 .= chr(0x0A);
524	++$c;
525	break;
526	case $substr_chrs_c_2 == '\f':
527	$utf8 .= chr(0x0C);
528	++$c;
529	break;
530	case $substr_chrs_c_2 == '\r':
531	$utf8 .= chr(0x0D);
532	++$c;
533	break;
534
535	case $substr_chrs_c_2 == '\\"':
536	case $substr_chrs_c_2 == '\\\'':
537	case $substr_chrs_c_2 == '\\\\':
538	case $substr_chrs_c_2 == '\\/':
539	if (($delim == '"' && $substr_chrs_c_2 != '\\\'') \|\|
540	($delim == "'" && $substr_chrs_c_2 != '\\"')) {
541	$utf8 .= $chrs{++$c};
542	}
543	break;
544
545	case preg_match('/\\\u[0-9A-F]{4}/i', substr($chrs, $c, 6)):
546	//echo ' matching single escaped unicode character from ' . substr($chrs, $c, 6);
547	// single, escaped unicode character
548	$utf16 = chr(hexdec(substr($chrs, ($c + 2), 2)))
549	. chr(hexdec(substr($chrs, ($c + 4), 2)));
550	$utf8 .= $this->utf162utf8($utf16);
551	$c += 5;
552	break;
553
554	case ($ord_chrs_c >= 0x20) && ($ord_chrs_c <= 0x7F):
555	$utf8 .= $chrs{$c};
556	break;
557
558	case ($ord_chrs_c & 0xE0) == 0xC0:
559	// characters U-00000080 - U-000007FF, mask 110XXXXX
560	//see http://www.cl.cam.ac.uk/~mgk25/unicode.html#utf-8
561	$utf8 .= substr($chrs, $c, 2);
562	++$c;
563	break;
564
565	case ($ord_chrs_c & 0xF0) == 0xE0:
566	// characters U-00000800 - U-0000FFFF, mask 1110XXXX
567	// see http://www.cl.cam.ac.uk/~mgk25/unicode.html#utf-8
568	$utf8 .= substr($chrs, $c, 3);
569	$c += 2;
570	break;
571
572	case ($ord_chrs_c & 0xF8) == 0xF0:
573	// characters U-00010000 - U-001FFFFF, mask 11110XXX
574	// see http://www.cl.cam.ac.uk/~mgk25/unicode.html#utf-8
575	$utf8 .= substr($chrs, $c, 4);
576	$c += 3;
577	break;
578
579	case ($ord_chrs_c & 0xFC) == 0xF8:
580	// characters U-00200000 - U-03FFFFFF, mask 111110XX
581	// see http://www.cl.cam.ac.uk/~mgk25/unicode.html#utf-8
582	$utf8 .= substr($chrs, $c, 5);
583	$c += 4;
584	break;
585
586	case ($ord_chrs_c & 0xFE) == 0xFC:
587	// characters U-04000000 - U-7FFFFFFF, mask 1111110X
588	// see http://www.cl.cam.ac.uk/~mgk25/unicode.html#utf-8
589	$utf8 .= substr($chrs, $c, 6);
590	$c += 5;
591	break;
592
593	}
594
595	}
596
597	//>> SJM2005
598	if ($this->encoding == SERVICES_JSON_UTF_8)
599	return $utf8;
600	if ($this->encoding == SERVICES_JSON_ISO_8859_1)
601	return utf8_decode($utf8);
602	else if (!function_exists('mb_convert_encoding'))
603	die('Requested encoding requires mb_strings extension.');
604	else
605	return mb_convert_encoding($utf8, $this->encoding, SERVICES_JSON_UTF_8);
606	//<< SJM2005
607
608	return $utf8;
609
610	} elseif (preg_match('/^\[.\]$/s', $str) \|\| preg_match('/^\{.\}$/s', $str)) {
611	// array, or object notation
612	if ($str{0} == '[') {
613	$stk = array(SERVICES_JSON_IN_ARR);
614	$arr = array();
615	} else {
616	if ($this->use == SERVICES_JSON_LOOSE_TYPE) {
617	$stk = array(SERVICES_JSON_IN_OBJ);
618	$obj = array();
619	} else {
620	$stk = array(SERVICES_JSON_IN_OBJ);
621	$obj = new stdClass();
622	}
623	}
624
625	array_push($stk, array('what' => SERVICES_JSON_SLICE,
626	'where' => 0,
627	'delim' => false));
628
629	$chrs = substr($str, 1, -1);
630	$chrs = $this->reduce_string($chrs);
631
632	if ($chrs == '') {
633	if (reset($stk) == SERVICES_JSON_IN_ARR) {
634	return $arr;
635
636	} else {
637	return $obj;
638
639	}
640	}
641
642	//print("\nparsing {$chrs}\n");
643
644	$strlen_chrs = strlen($chrs);
645	for ($c = 0; $c <= $strlen_chrs; ++$c) {
646
647	$top = end($stk);
648	$substr_chrs_c_2 = substr($chrs, $c, 2);
649
650	if (($c == $strlen_chrs) \|\| (($chrs{$c} == ',') && ($top['what'] == SERVICES_JSON_SLICE))) {
651	// found a comma that is not inside a string, array, etc.,
652	// OR we've reached the end of the character list
653	$slice = substr($chrs, $top['where'], ($c - $top['where']));
654	array_push($stk, array('what' => SERVICES_JSON_SLICE, 'where' => ($c + 1), 'delim' => false));
655	//print("Found split at {$c}: ".substr($chrs, $top['where'], (1 + $c - $top['where']))."\n");
656
657	if (reset($stk) == SERVICES_JSON_IN_ARR) {
658	// we are in an array, so just push an element onto the stack
659	array_push($arr, $this->decode($slice));
660
661	} elseif (reset($stk) == SERVICES_JSON_IN_OBJ) {
662	// we are in an object, so figure
663	// out the property name and set an
664	// element in an associative array,
665	// for now
666	if (preg_match('/^\s(["\'].[^\\\]["\'])\s:\s(\S.*),?$/Uis', $slice, $parts)) {
667	// "name":value pair
668	$key = $this->decode($parts[1]);
669	$val = $this->decode($parts[2]);
670
671	if ($this->use == SERVICES_JSON_LOOSE_TYPE) {
672	$obj[$key] = $val;
673	} else {
674	$obj->$key = $val;
675	}
676	} elseif (preg_match('/^\s(\w+)\s:\s(\S.),?$/Uis', $slice, $parts)) {
677	// name:value pair, where name is unquoted
678	$key = $parts[1];
679	$val = $this->decode($parts[2]);
680
681	if ($this->use == SERVICES_JSON_LOOSE_TYPE) {
682	$obj[$key] = $val;
683	} else {
684	$obj->$key = $val;
685	}
686	}
687
688	}
689
690	} elseif ((($chrs{$c} == '"') \|\| ($chrs{$c} == "'")) && ($top['what'] != SERVICES_JSON_IN_STR)) {
691	// found a quote, and we are not inside a string
692	array_push($stk, array('what' => SERVICES_JSON_IN_STR, 'where' => $c, 'delim' => $chrs{$c}));
693	//print("Found start of string at {$c}\n");
694
695	//>> SAO2006
696	/*} elseif (($chrs{$c} == $top['delim']) &&
697	($top['what'] == SERVICES_JSON_IN_STR) &&
698	(($chrs{$c - 1} != '\\') \|\|
699	($chrs{$c - 1} == '\\' && $chrs{$c - 2} == '\\'))) {*/
700	} elseif ($chrs{$c} == $top['delim'] &&
701	$top['what'] == SERVICES_JSON_IN_STR) {
702	//print("Found potential end of string at {$c}\n");
703	// verify quote is not escaped: it has no or an even number of \\ before it.
704	for ($i=0; ($chrs{$c - ($i+1)} == '\\'); $i++);
705	/*$i = 0;
706	while ( $chrs{$c - ($i+1)} == '\\')
707	$i++;*/
708	//print("Found {$i} \ before delim\n");
709	if ($i % 2 != 0)
710	{
711	//print("delim escaped, not end of string\n");
712	continue;
713	}
714	//>> SAO2006
715	// found a quote, we're in a string, and it's not escaped
716	array_pop($stk);
717	//print("Found end of string at {$c}: ".substr($chrs, $top['where'], (1 + 1 + $c - $top['where']))."\n");
718
719	} elseif (($chrs{$c} == '[') &&
720	in_array($top['what'], array(SERVICES_JSON_SLICE, SERVICES_JSON_IN_ARR, SERVICES_JSON_IN_OBJ))) {
721	// found a left-bracket, and we are in an array, object, or slice
722	array_push($stk, array('what' => SERVICES_JSON_IN_ARR, 'where' => $c, 'delim' => false));
723	//print("Found start of array at {$c}\n");
724
725	} elseif (($chrs{$c} == ']') && ($top['what'] == SERVICES_JSON_IN_ARR)) {
726	// found a right-bracket, and we're in an array
727	array_pop($stk);
728	//print("Found end of array at {$c}: ".substr($chrs, $top['where'], (1 + $c - $top['where']))."\n");
729
730	} elseif (($chrs{$c} == '{') &&
731	in_array($top['what'], array(SERVICES_JSON_SLICE, SERVICES_JSON_IN_ARR, SERVICES_JSON_IN_OBJ))) {
732	// found a left-brace, and we are in an array, object, or slice
733	array_push($stk, array('what' => SERVICES_JSON_IN_OBJ, 'where' => $c, 'delim' => false));
734	//print("Found start of object at {$c}\n");
735
736	} elseif (($chrs{$c} == '}') && ($top['what'] == SERVICES_JSON_IN_OBJ)) {
737	// found a right-brace, and we're in an object
738	array_pop($stk);
739	//print("Found end of object at {$c}: ".substr($chrs, $top['where'], (1 + $c - $top['where']))."\n");
740
741	} elseif (($substr_chrs_c_2 == '/*') &&
742	in_array($top['what'], array(SERVICES_JSON_SLICE, SERVICES_JSON_IN_ARR, SERVICES_JSON_IN_OBJ))) {
743	// found a comment start, and we are in an array, object, or slice
744	array_push($stk, array('what' => SERVICES_JSON_IN_CMT, 'where' => $c, 'delim' => false));
745	$c++;
746	//print("Found start of comment at {$c}\n");
747
748	} elseif (($substr_chrs_c_2 == '*/') && ($top['what'] == SERVICES_JSON_IN_CMT)) {
749	// found a comment end, and we're in one now
750	array_pop($stk);
751	$c++;
752
753	for ($i = $top['where']; $i <= $c; ++$i)
754	$chrs = substr_replace($chrs, ' ', $i, 1);
755
756	//print("Found end of comment at {$c}: ".substr($chrs, $top['where'], (1 + $c - $top['where']))."\n");
757
758	}
759
760	}
761
762	if (reset($stk) == SERVICES_JSON_IN_ARR) {
763	return $arr;
764
765	} elseif (reset($stk) == SERVICES_JSON_IN_OBJ) {
766	return $obj;
767
768	}
769
770	}
771	}
772	}
773
774	}
775
776	/*function hex($s)
777	{
778	$l = strlen($s);
779	for ($i=0; $i < $l; $i++)
780	//echo '['.(ord($s{$i})).']';
781	echo '['.bin2hex($s{$i}).']';
782	}
783
784	//$d = '["hello world\\""]';
785	$d = '["\\\\\\"hello world,\\\\\\""]';
786	//$d = '["\\\\", "\\\\"]';
787	hex($d);
788	$test = new Services_JSON();
789	echo('<pre>');
790	print_r($d . "\n");
791	print_r($test->decode($d));
792	echo('</pre>');
793	*/
794	?>

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source: Dev/trunk/src/client/dojox/grid/tests/support/json.php

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