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1 | <?php | |
2 | class FeedParser { | |
3 | private $doc; | |
4 | private $error; | |
5 | private $libxml_errors = array(); | |
6 | private $items; | |
7 | private $link; | |
8 | private $title; | |
9 | private $type; | |
10 | private $xpath; | |
11 | ||
12 | const FEED_RDF = 0; | |
13 | const FEED_RSS = 1; | |
14 | const FEED_ATOM = 2; | |
15 | ||
16 | function normalize_encoding($data) { | |
17 | if (preg_match('/^(<\?xml[\t\n\r ].*?encoding[\t\n\r ]*=[\t\n\r ]*["\'])(.+?)(["\'].*?\?>)/s', $data, $matches) === 1) { | |
18 | $data = mb_convert_encoding($data, 'UTF-8', $matches[2]); | |
19 | ||
20 | $data = preg_replace('/^<\?xml[\t\n\r ].*?\?>/s', $matches[1] . "UTF-8" . $matches[3] , $data); | |
21 | } | |
22 | ||
23 | return $data; | |
24 | } | |
25 | ||
26 | function __construct($data) { | |
27 | libxml_use_internal_errors(true); | |
28 | libxml_clear_errors(); | |
29 | $this->doc = new DOMDocument(); | |
30 | $this->doc->loadXML($data); | |
31 | ||
32 | mb_substitute_character("none"); | |
33 | ||
34 | $error = libxml_get_last_error(); | |
35 | ||
36 | // libxml compiled without iconv? | |
37 | if ($error && $error->code == 32) { | |
38 | $data = $this->normalize_encoding($data); | |
39 | ||
40 | if ($data) { | |
41 | libxml_clear_errors(); | |
42 | ||
43 | $this->doc = new DOMDocument(); | |
44 | $this->doc->loadXML($data); | |
45 | ||
46 | $error = libxml_get_last_error(); | |
47 | } | |
48 | } | |
49 | ||
50 | // some terrible invalid unicode entity? | |
51 | if ($error) { | |
52 | foreach (libxml_get_errors() as $err) { | |
53 | if ($err->code == 9) { | |
54 | // if the source feed is not in utf8, next conversion will fail | |
55 | $data = $this->normalize_encoding($data); | |
56 | ||
57 | // remove dangling bytes | |
58 | $data = mb_convert_encoding($data, 'UTF-8', 'UTF-8'); | |
59 | ||
60 | // apparently not all UTF-8 characters are valid for XML | |
61 | $data = preg_replace('/[^\x{0009}\x{000a}\x{000d}\x{0020}-\x{D7FF}\x{E000}-\x{FFFD}]+/u', ' ', $data); | |
62 | ||
63 | if ($data) { | |
64 | libxml_clear_errors(); | |
65 | ||
66 | $this->doc = new DOMDocument(); | |
67 | $this->doc->loadXML($data); | |
68 | ||
69 | $error = libxml_get_last_error(); | |
70 | } | |
71 | break; | |
72 | } | |
73 | } | |
74 | } | |
75 | ||
76 | if ($error) { | |
77 | foreach (libxml_get_errors() as $error) { | |
78 | if ($error->level == LIBXML_ERR_FATAL) { | |
79 | if(!isset($this->error)) //currently only the first error is reported | |
80 | $this->error = $this->format_error($error); | |
81 | $this->libxml_errors [] = $this->format_error($error); | |
82 | } | |
83 | } | |
84 | } | |
85 | libxml_clear_errors(); | |
86 | ||
87 | $this->items = array(); | |
88 | } | |
89 | ||
90 | function init() { | |
91 | $root = $this->doc->firstChild; | |
92 | $xpath = new DOMXPath($this->doc); | |
93 | $xpath->registerNamespace('atom', 'http://www.w3.org/2005/Atom'); | |
94 | $xpath->registerNamespace('atom03', 'http://purl.org/atom/ns#'); | |
95 | $xpath->registerNamespace('media', 'http://search.yahoo.com/mrss/'); | |
96 | $xpath->registerNamespace('rdf', 'http://www.w3.org/1999/02/22-rdf-syntax-ns#'); | |
97 | $xpath->registerNamespace('slash', 'http://purl.org/rss/1.0/modules/slash/'); | |
98 | $xpath->registerNamespace('dc', 'http://purl.org/dc/elements/1.1/'); | |
99 | $xpath->registerNamespace('content', 'http://purl.org/rss/1.0/modules/content/'); | |
100 | $xpath->registerNamespace('thread', 'http://purl.org/syndication/thread/1.0'); | |
101 | ||
102 | $this->xpath = $xpath; | |
103 | ||
104 | $root = $xpath->query("(//atom03:feed|//atom:feed|//channel|//rdf:rdf|//rdf:RDF)"); | |
105 | ||
106 | if ($root && $root->length > 0) { | |
107 | $root = $root->item(0); | |
108 | ||
109 | if ($root) { | |
110 | switch (mb_strtolower($root->tagName)) { | |
111 | case "rdf:rdf": | |
112 | $this->type = $this::FEED_RDF; | |
113 | break; | |
114 | case "channel": | |
115 | $this->type = $this::FEED_RSS; | |
116 | break; | |
117 | case "feed": | |
118 | $this->type = $this::FEED_ATOM; | |
119 | break; | |
120 | default: | |
121 | if( !isset($this->error) ){ | |
122 | $this->error = "Unknown/unsupported feed type"; | |
123 | } | |
124 | return; | |
125 | } | |
126 | } | |
127 | ||
128 | switch ($this->type) { | |
129 | case $this::FEED_ATOM: | |
130 | ||
131 | $title = $xpath->query("//atom:feed/atom:title")->item(0); | |
132 | ||
133 | if (!$title) | |
134 | $title = $xpath->query("//atom03:feed/atom03:title")->item(0); | |
135 | ||
136 | ||
137 | if ($title) { | |
138 | $this->title = $title->nodeValue; | |
139 | } | |
140 | ||
141 | $link = $xpath->query("//atom:feed/atom:link[not(@rel)]")->item(0); | |
142 | ||
143 | if (!$link) | |
144 | $link = $xpath->query("//atom03:feed/atom03:link[not(@rel)]")->item(0); | |
145 | ||
146 | ||
147 | if ($link && $link->hasAttributes()) { | |
148 | $this->link = $link->getAttribute("href"); | |
149 | } | |
150 | ||
151 | $articles = $xpath->query("//atom:entry"); | |
152 | ||
153 | if (!$articles || $articles->length == 0) | |
154 | $articles = $xpath->query("//atom03:entry"); | |
155 | ||
156 | foreach ($articles as $article) { | |
157 | array_push($this->items, new FeedItem_Atom($article, $this->doc, $this->xpath)); | |
158 | } | |
159 | ||
160 | break; | |
161 | case $this::FEED_RSS: | |
162 | $title = $xpath->query("//channel/title")->item(0); | |
163 | ||
164 | if ($title) { | |
165 | $this->title = $title->nodeValue; | |
166 | } | |
167 | ||
168 | $link = $xpath->query("//channel/link")->item(0); | |
169 | ||
170 | if ($link) { | |
171 | if ($link->getAttribute("href")) | |
172 | $this->link = $link->getAttribute("href"); | |
173 | else if ($link->nodeValue) | |
174 | $this->link = $link->nodeValue; | |
175 | } | |
176 | ||
177 | $articles = $xpath->query("//channel/item"); | |
178 | ||
179 | foreach ($articles as $article) { | |
180 | array_push($this->items, new FeedItem_RSS($article, $this->doc, $this->xpath)); | |
181 | } | |
182 | ||
183 | break; | |
184 | case $this::FEED_RDF: | |
185 | $xpath->registerNamespace('rssfake', 'http://purl.org/rss/1.0/'); | |
186 | ||
187 | $title = $xpath->query("//rssfake:channel/rssfake:title")->item(0); | |
188 | ||
189 | if ($title) { | |
190 | $this->title = $title->nodeValue; | |
191 | } | |
192 | ||
193 | $link = $xpath->query("//rssfake:channel/rssfake:link")->item(0); | |
194 | ||
195 | if ($link) { | |
196 | $this->link = $link->nodeValue; | |
197 | } | |
198 | ||
199 | $articles = $xpath->query("//rssfake:item"); | |
200 | ||
201 | foreach ($articles as $article) { | |
202 | array_push($this->items, new FeedItem_RSS($article, $this->doc, $this->xpath)); | |
203 | } | |
204 | ||
205 | break; | |
206 | ||
207 | } | |
208 | ||
209 | if ($this->title) $this->title = trim($this->title); | |
210 | if ($this->link) $this->link = trim($this->link); | |
211 | ||
212 | } else { | |
213 | if( !isset($this->error) ){ | |
214 | $this->error = "Unknown/unsupported feed type"; | |
215 | } | |
216 | return; | |
217 | } | |
218 | } | |
219 | ||
220 | function format_error($error) { | |
221 | if ($error) { | |
222 | return sprintf("LibXML error %s at line %d (column %d): %s", | |
223 | $error->code, $error->line, $error->column, | |
224 | $error->message); | |
225 | } else { | |
226 | return ""; | |
227 | } | |
228 | } | |
229 | ||
230 | function error() { | |
231 | return $this->error; | |
232 | } | |
233 | ||
234 | function errors() { | |
235 | return $this->libxml_errors; | |
236 | } | |
237 | ||
238 | function get_link() { | |
239 | return $this->link; | |
240 | } | |
241 | ||
242 | function get_title() { | |
243 | return $this->title; | |
244 | } | |
245 | ||
246 | function get_items() { | |
247 | return $this->items; | |
248 | } | |
249 | ||
250 | function get_links($rel) { | |
251 | $rv = array(); | |
252 | ||
253 | switch ($this->type) { | |
254 | case $this::FEED_ATOM: | |
255 | $links = $this->xpath->query("//atom:feed/atom:link"); | |
256 | ||
257 | foreach ($links as $link) { | |
258 | if (!$rel || $link->hasAttribute('rel') && $link->getAttribute('rel') == $rel) { | |
259 | array_push($rv, trim($link->getAttribute('href'))); | |
260 | } | |
261 | } | |
262 | break; | |
263 | case $this::FEED_RSS: | |
264 | $links = $this->xpath->query("//atom:link"); | |
265 | ||
266 | foreach ($links as $link) { | |
267 | if (!$rel || $link->hasAttribute('rel') && $link->getAttribute('rel') == $rel) { | |
268 | array_push($rv, trim($link->getAttribute('href'))); | |
269 | } | |
270 | } | |
271 | break; | |
272 | } | |
273 | ||
274 | return $rv; | |
275 | } | |
276 | } ?> |