ILIAS  release_5-1 Revision 5.0.0-5477-g43f3e3fab5f
ParseHTML.php
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1<?php
2
24
28 var $_re_flags = "si";
29
34 "<!--.*?-->|<!\[CDATA\[.*?\]\]>|<script\b(?!:)[^>]*>.*?<\/script>";
35
39 var $_tag_expr = "<%s%s(?:\s.*?)?%s>";
40
44 var $_attr_find = '\b([-\w]+)=(".*?"|\'.*?\'|.+?)[\/\s>]';
45
47 {
48 $this->_attr_find = sprintf("/%s/%s",
49 $this->_attr_find,
50 $this->_re_flags);
51
52 $this->_removed_re = sprintf("/%s/%s",
53 $this->_removed_re,
54 $this->_re_flags);
55
56 $this->_entity_replacements = array(
57 'amp' => '&',
58 'lt' => '<',
59 'gt' => '>',
60 'quot' => '"'
61 );
62
63 $this->_ent_replace =
64 sprintf("&(%s);", implode("|",
65 $this->_entity_replacements));
66 }
67
77 function replaceEntities($str)
78 {
79 foreach ($this->_entity_replacements as $old => $new) {
80 $str = preg_replace(sprintf("/&%s;/", $old), $new, $str);
81 }
82
83 // Replace numeric entities because html_entity_decode doesn't
84 // do it for us.
85 $str = preg_replace_callback(
86 '~&#x([0-9a-f]+);~i',
87 function($hit) {
88 return chr(hexdec($hit[1]));
89 },
90 $str
91 );
92 $str = preg_replace_callback(
93 '~&#([0-9]+);~',
94 function($hit) {
95 return chr($hit[1]);
96 },
97 $str
98 );
99
100 return $str;
101 }
102
112 function removeQuotes($str)
113 {
114 $matches = array();
115 $double = '/^"(.*)"$/';
116 $single = "/^\'(.*)\'$/";
117
118 if (preg_match($double, $str, $matches)) {
119 return $matches[1];
120 } else if (preg_match($single, $str, $matches)) {
121 return $matches[1];
122 } else {
123 return $str;
124 }
125 }
126
138 function tagPattern($tag_names, $close, $self_close)
139 {
140 if (is_array($tag_names)) {
141 $tag_names = '(?:'.implode('|',$tag_names).')';
142 }
143 if ($close) {
144 $close = '\/' . (($close == 1)? '' : '?');
145 } else {
146 $close = '';
147 }
148 if ($self_close) {
149 $self_close = '(?:\/\s*)' . (($self_close == 1)? '' : '?');
150 } else {
151 $self_close = '';
152 }
153 $expr = sprintf($this->_tag_expr, $close, $tag_names, $self_close);
154
155 return sprintf("/%s/%s", $expr, $this->_re_flags);
156 }
157
169 function getMetaTags($html_string)
170 {
171 $html_string = preg_replace($this->_removed_re,
172 "",
173 $html_string);
174
175 $key_tags = array($this->tagPattern('html', false, false),
176 $this->tagPattern('head', false, false),
177 $this->tagPattern('head', true, false),
178 $this->tagPattern('html', true, false),
179 $this->tagPattern(array(
180 'body', 'frameset', 'frame', 'p', 'div',
181 'table','span','a'), 'maybe', 'maybe'));
182 $key_tags_pos = array();
183 foreach ($key_tags as $pat) {
184 $matches = array();
185 preg_match($pat, $html_string, $matches, PREG_OFFSET_CAPTURE);
186 if($matches) {
187 $key_tags_pos[] = $matches[0][1];
188 } else {
189 $key_tags_pos[] = null;
190 }
191 }
192 // no opening head tag
193 if (is_null($key_tags_pos[1])) {
194 return array();
195 }
196 // the effective </head> is the min of the following
197 if (is_null($key_tags_pos[2])) {
198 $key_tags_pos[2] = strlen($html_string);
199 }
200 foreach (array($key_tags_pos[3], $key_tags_pos[4]) as $pos) {
201 if (!is_null($pos) && $pos < $key_tags_pos[2]) {
202 $key_tags_pos[2] = $pos;
203 }
204 }
205 // closing head tag comes before opening head tag
206 if ($key_tags_pos[1] > $key_tags_pos[2]) {
207 return array();
208 }
209 // if there is an opening html tag, make sure the opening head tag
210 // comes after it
211 if (!is_null($key_tags_pos[0]) && $key_tags_pos[1] < $key_tags_pos[0]) {
212 return array();
213 }
214 $html_string = substr($html_string, $key_tags_pos[1],
215 ($key_tags_pos[2]-$key_tags_pos[1]));
216
217 $link_data = array();
218 $link_matches = array();
219
220 if (!preg_match_all($this->tagPattern('meta', false, 'maybe'),
221 $html_string, $link_matches)) {
222 return array();
223 }
224
225 foreach ($link_matches[0] as $link) {
226 $attr_matches = array();
227 preg_match_all($this->_attr_find, $link, $attr_matches);
228 $link_attrs = array();
229 foreach ($attr_matches[0] as $index => $full_match) {
230 $name = $attr_matches[1][$index];
231 $value = $this->replaceEntities(
232 $this->removeQuotes($attr_matches[2][$index]));
233
234 $link_attrs[strtolower($name)] = $value;
235 }
236 $link_data[] = $link_attrs;
237 }
238
239 return $link_data;
240 }
241
252 function getHTTPEquiv($html_string)
253 {
254 $meta_tags = $this->getMetaTags($html_string);
255
256 if ($meta_tags) {
257 foreach ($meta_tags as $tag) {
258 if (array_key_exists('http-equiv', $tag) &&
259 (in_array(strtolower($tag['http-equiv']),
260 array('x-xrds-location', 'x-yadis-location'))) &&
261 array_key_exists('content', $tag)) {
262 return $tag['content'];
263 }
264 }
265 }
266
267 return null;
268 }
269}
270
$_tag_expr
@access private
Definition: ParseHTML.php:39
replaceEntities($str)
Replace HTML entities (amp, lt, gt, and quot) as well as numeric entities (e.g.
Definition: ParseHTML.php:77
$_re_flags
@access private
Definition: ParseHTML.php:28
$_removed_re
@access private
Definition: ParseHTML.php:33
removeQuotes($str)
Strip single and double quotes off of a string, if they are present.
Definition: ParseHTML.php:112
$_attr_find
@access private
Definition: ParseHTML.php:44
getHTTPEquiv($html_string)
Looks for a META tag with an "http-equiv" attribute whose value is one of ("x-xrds-location",...
Definition: ParseHTML.php:252
tagPattern($tag_names, $close, $self_close)
Create a regular expression that will match an opening or closing tag from a set of names.
Definition: ParseHTML.php:138
getMetaTags($html_string)
Given an HTML document string, this finds all the META tags in the document, provided they are found ...
Definition: ParseHTML.php:169