feedwordpress / feedwordpressparsedpostmeta.class.php

feedwordpressparsedpostmeta.class.php in FeedWordPress 2013.0504, at feedwordpressparsedpostmeta.class.php

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1	<?php
2	class FeedWordPressParsedPostMeta {
3	var $s, $ptr, $ptrEOS;
4	var $delims, $delimCount, $delimPtr;
5	var $paren;
6
7	var $parsed = NULL;
8
9	function __construct ($s) {
10	$this->s = $s;
11	$this->reset();
12	}
13
14	function reset () {
15	$this->parsed = NULL;
16
17	$this->ptr = 0;
18	$this->paren = 0;
19	$this->ptrEOS = strlen($this->s);
20
21	$this->delimCount['CDATA'] = preg_match_all('/\$/', $this->s, $this->delims['CDATA'], PREG_OFFSET_CAPTURE);
22	$this->delimPtr['CDATA'] = 0;
23
24	$this->delimCount['EXPR'] = preg_match_all('/[()\s]/', $this->s, $this->delims['EXPR'], PREG_OFFSET_CAPTURE);
25	$this->delimPtr['EXPR'] = 0;
26	}
27
28	function look () { return $this->s[$this->ptr]; }
29	function drop () { $this->anchor = $this->ptr; }
30	function take () { return substr($this->s, $this->anchor, ($this->ptr - $this->anchor)); }
31	function EOS () { return ($this->ptr >= $this->ptrEOS); }
32
33	function nextDelim ($which) {
34	$N = $this->delimCount[$which]; $ptr = $this->delimPtr[$which];
35
36	$next = -1;
37	while ( ($ptr < $N) and ($next < $this->ptr) ) :
38	$next = $this->delims[$which][0][$ptr][1];
39	$ptr++;
40	endwhile;
41	$this->delimPtr[$which] = $ptr;
42
43	if ($next < $this->ptr) :
44	$next = $this->ptrEOS;
45	endif;
46	return $next;
47	}
48
49	function substitute_terms ($post, $piece, $values = NULL) {
50	$terms = array();
51	if ('EXPR'==$piece[0]) :
52	// Parameter stored in $piece[1]
53	$param = $piece[1];
54	if (is_string($param)) :
55	if (!isset($values[$param])) :
56	$values[$param] = $post->query($param);
57	endif;
58	$term = $param;
59	$results = $values[$param];
60	else :
61	list($results, $term, $values) = $this->substitute_terms($post, $piece[1], $values);
62	endif;
63
64	// Filtering function, if any, stored in $piece[2]
65	if (isset($piece[2])) :
66	$filter = $post->substitution_function(trim(strtolower($piece[2])));
67	if (!is_null($filter)) :
68	foreach ($results as $key => $result) :
69	$results[$key] = $filter($result);
70	endforeach;
71	else :
72	$results = array(
73	"[[ERR: No such function (".$piece[2].")]]",
74	);
75	endif;
76	endif;
77
78	elseif ('CDATA'==$piece[0]) :
79	// Literal string stored in $piece[1]
80	$results = array($piece[1]);
81	$term = NULL;
82	endif;
83	return array($results, $term, $values);
84	}
85
86	function do_substitutions ($post, $in = NULL, $scratchpad = NULL) {
87	if (is_null($in)) :
88	$in = $this->get();
89	endif;
90
91	if (count($in) > 0) :
92	$out = array();
93
94	// Init. results set if not already initialized.
95	if (is_null($scratchpad)) :
96	$scratchpad = array(array('', array()));
97	endif;
98
99	// Grab the first
100	$piece = array_shift($in);
101
102	foreach ($scratchpad as $key => $scratch) :
103	$line = $scratch[0];
104	$element_values = $scratch[1];
105
106	switch ($piece[0]) :
107	case 'CDATA' :
108	$subs = array($piece[1]);
109	$term = NULL;
110	break;
111	case 'EXPR' :
112	list($subs, $term, $element_values) = $this->substitute_terms($post, $piece, $element_values);
113	break;
114	endswitch;
115
116	$constrained_values = $element_values;
117	foreach ($subs as $sub) :
118
119	if (isset($term)) :
120	$constrained_values[$term] = array($sub);
121	endif;
122
123	$out[] = array($line . $sub, $constrained_values);
124	endforeach;
125
126	endforeach;
127
128	if (count($in) > 0) :
129	$out = $this->do_substitutions($post, $in, $out);
130	endif;
131	else :
132	$out = NULL;
133	endif;
134
135	// Now that we are done, strip out the namespace elements.
136	if (is_array($out)) :
137	foreach ($out as $idx => $line) :
138	if (is_array($line)) :
139	$out[$idx] = $line[0];
140	endif;
141	endforeach;
142	endif;
143
144	return $out;
145	}
146
147	function get ($idx = NULL) {
148	$ret = $this->parse();
149	if ($idx) : $ret = $ret[$idx]; endif;
150
151	return $ret;
152	}
153
154	function parse () {
155	if (is_null($this->parsed)) :
156	$out = array();
157
158	$this->reset();
159	while (!$this->EOS()) :
160	switch ($this->look()) :
161	case '$' :
162	$this->ptr++;
163	$out[] = $this->EXPR();
164	break;
165	default :
166	$out[] = $this->CDATA();
167	endswitch;
168	endwhile;
169
170	$this->parsed = $out;
171	endif;
172	return $this->parsed;
173	}
174
175	function CDATA () {
176	$this->drop();
177	$this->ptr = $this->nextDelim('CDATA');
178	return array(__FUNCTION__, $this->take());
179	} /* FeedWordPressParsedPostMeta::CDATA() */
180
181	function EXPR () {
182	$ret = array(__FUNCTION__);
183	$paren0 = $this->paren;
184	$this->drop();
185
186	$ptr0 = $this->ptr;
187
188	$complete = false;
189	while (!$this->EOS() and !$complete) :
190	$tok = $this->look();
191	switch ($tok) :
192	case '(' :
193
194	$fun = $this->take();
195
196	// We're at the open paren; skip ahead past that.
197	$this->ptr++;
198
199	// And indent us one level in.
200	$this->paren++;
201
202	$delta = $this->EXPR();
203	if (isset($delta[2])) :
204	$ret[1] = $delta;
205	else :
206	$ret[1] = $delta[1];
207	endif;
208
209	if (strlen(trim($fun)) > 0) :
210	$ret[2] = trim($fun);
211	endif;
212
213	// We should be stopped on either a close paren or on EOS.
214	$this->ptr++;
215
216	// A top level expression terminates
217	// immediately with the closing of its
218	// parens. Lower-level expressions may
219	// have whitespace wrapper, etc.
220	$complete = ($this->paren <= 0);
221
222	$this->drop();
223	break;
224
225	case ')' :
226
227	if ($this->paren > 0) :
228	$this->paren--;
229
230	$complete = ($this->paren <= $paren0);
231
232	$fun = $this->take();
233	if (strlen(trim($fun)) > 0) :
234	$ret[1] = trim($fun);
235	endif;
236
237	$this->drop();
238	else :
239	$this->ptr++;
240	endif;
241	break;
242
243	case '$' :
244	if ($ptr0 == $this->ptr) :
245	// This is an escaped literal $
246	$this->ptr++;
247	$ret = array('CDATA', $tok);
248	$this->drop();
249	$complete = true;
250	break;
251	endif;
252
253	default :
254	if (ctype_space($tok) and ($this->paren <= 0)) :
255	// A loose $ should be treated as a literal $
256	if ($ptr0 == $this->ptr) :
257	$ret = array('CDATA', '$');
258	$this->drop();
259	endif;
260	$complete = true;
261	else :
262	$next = $this->nextDelim('EXPR');
263
264	// Skip ahead to the next potentially interesting character.
265	if (!is_null($next)) :
266	$this->ptr = $next;
267	else :
268	$this->ptr = $this->ptrEOS;
269	endif;
270
271	endif;
272	endswitch;
273	endwhile;
274
275	$var = '';
276	if ($this->anchor < $this->ptr) :
277	$var = trim($this->take());
278	endif;
279	if (strlen($var) > 0) :
280	$ret[1] = $var;
281	endif;
282	return $ret;
283	} /* FeedWordPressParsedPostMeta::EXPR () */
284	} /* class FeedWordPressParsedPostMeta */
285
286	if (basename($_SERVER['SCRIPT_FILENAME'])==basename(__FILE__)) :
287	$argv = $_SERVER['argv'];
288	array_shift($argv);
289	$N = reset($argv);
290	if (is_numeric($N)) :
291	array_shift($argv);
292	else :
293	$N = 1;
294	endif;
295
296	$t0 = microtime(/float=/ true);
297	for ($i = 0; $i < $N; $i++) :
298	$parse = new FeedWordPressParsedPostMeta(implode(" ", $argv));
299	$voo = ($parse->parse());
300	unset($parse);
301	endfor;
302	$t1 = microtime(/float=/ true);
303
304	echo "RESULT: "; var_dump($voo);
305	echo "ELAPSED TIME: "; print number_format(1000.0 * ($t1 - $t0)) . "ms\n";
306	echo "CONSUMED MEMORY: "; print number_format(memory_get_peak_usage() / 1024) . "KB\n";
307	endif;
308
309