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authorNicolas Lœuillet <nicolas.loeuillet@gmail.com>2013-12-23 02:28:56 -0800
committerNicolas Lœuillet <nicolas.loeuillet@gmail.com>2013-12-23 02:28:56 -0800
commit60fc4f4b1ab37fbfe9021f3fa1395d66a4424ed2 (patch)
tree515c4b9c8286ae363f77722c91acb878151dc386 /inc/3rdparty/content-extractor/SiteConfig.php
parentcbfd5a1019f47fadefd8490dae9f039ae894298d (diff)
parentda5fc42f615eeb45a702604970f94967507fb432 (diff)
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Merge pull request #363 from inthepoche/dev1.3.0
poche 1.3.0
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diff --git a/inc/3rdparty/content-extractor/SiteConfig.php b/inc/3rdparty/content-extractor/SiteConfig.php
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1<?php
2/**
3 * Site Config
4 *
5 * Each instance of this class should hold extraction patterns and other directives
6 * for a website. See ContentExtractor class to see how it's used.
7 *
8 * @version 0.6
9 * @date 2011-10-30
10 * @author Keyvan Minoukadeh
11 * @copyright 2011 Keyvan Minoukadeh
12 * @license http://www.gnu.org/licenses/agpl-3.0.html AGPL v3
13 */
14
15class SiteConfig
16{
17 // Use first matching element as title (0 or more xpath expressions)
18 public $title = array();
19
20 // Use first matching element as body (0 or more xpath expressions)
21 public $body = array();
22
23 // Use first matching element as author (0 or more xpath expressions)
24 public $author = array();
25
26 // Use first matching element as date (0 or more xpath expressions)
27 public $date = array();
28
29 // Strip elements matching these xpath expressions (0 or more)
30 public $strip = array();
31
32 // Strip elements which contain these strings (0 or more) in the id or class attribute
33 public $strip_id_or_class = array();
34
35 // Strip images which contain these strings (0 or more) in the src attribute
36 public $strip_image_src = array();
37
38 // Additional HTTP headers to send
39 // NOT YET USED
40 public $http_header = array();
41
42 // Process HTML with tidy before creating DOM
43 public $tidy = true;
44
45 // Autodetect title/body if xpath expressions fail to produce results.
46 // Note that this applies to title and body separately, ie.
47 // * if we get a body match but no title match, this option will determine whether we autodetect title
48 // * if neither match, this determines whether we autodetect title and body.
49 // Also note that this only applies when there is at least one xpath expression in title or body, ie.
50 // * if title and body are both empty (no xpath expressions), this option has no effect (both title and body will be auto-detected)
51 // * if there's an xpath expression for title and none for body, body will be auto-detected and this option will determine whether we auto-detect title if the xpath expression for it fails to produce results.
52 // Usage scenario: you want to extract something specific from a set of URLs, e.g. a table, and if the table is not found, you want to ignore the entry completely. Auto-detection is unlikely to succeed here, so you construct your patterns and set this option to false. Another scenario may be a site where auto-detection has proven to fail (or worse, picked up the wrong content).
53 public $autodetect_on_failure = true;
54
55 // Clean up content block - attempt to remove elements that appear to be superfluous
56 public $prune = true;
57
58 // Test URL - if present, can be used to test the config above
59 public $test_url = null;
60
61 // Single-page link - should identify a link element or URL pointing to the page holding the entire article
62 // This is useful for sites which split their articles across multiple pages. Links to such pages tend to
63 // display the first page with links to the other pages at the bottom. Often there is also a link to a page
64 // which displays the entire article on one page (e.g. 'print view').
65 // This should be an XPath expression identifying the link to that page. If present and we find a match,
66 // we will retrieve that page and the rest of the options in this config will be applied to the new page.
67 public $single_page_link = array();
68
69 // Single-page link in feed? - same as above, but patterns applied to item description HTML taken from feed
70 public $single_page_link_in_feed = array();
71
72 // TODO: which parser to use for turning raw HTML into a DOMDocument
73 public $parser = 'libxml';
74
75 // String replacement to be made on HTML before processing begins
76 public $replace_string = array();
77
78 // the options below cannot be set in the config files which this class represents
79
80 public static $debug = false;
81 protected static $config_path;
82 protected static $config_path_fallback;
83 protected static $config_cache = array();
84 const HOSTNAME_REGEX = '/^(([a-zA-Z0-9-]*[a-zA-Z0-9])\.)*([A-Za-z0-9-]*[A-Za-z0-9])$/';
85
86 protected static function debug($msg) {
87 if (self::$debug) {
88 $mem = round(memory_get_usage()/1024, 2);
89 $memPeak = round(memory_get_peak_usage()/1024, 2);
90 echo '* ',$msg;
91 echo ' - mem used: ',$mem," (peak: $memPeak)\n";
92 ob_flush();
93 flush();
94 }
95 }
96
97 public static function set_config_path($path, $fallback=null) {
98 self::$config_path = $path;
99 self::$config_path_fallback = $fallback;
100 }
101
102 public static function add_to_cache($host, SiteConfig $config) {
103 $host = strtolower($host);
104 self::$config_cache[$host] = $config;
105 }
106
107 // returns SiteConfig instance if an appropriate one is found, false otherwise
108 public static function build($host) {
109 $host = strtolower($host);
110 if (substr($host, 0, 4) == 'www.') $host = substr($host, 4);
111 if (!$host || (strlen($host) > 200) || !preg_match(self::HOSTNAME_REGEX, $host)) return false;
112 // check for site configuration
113 $try = array($host);
114 $split = explode('.', $host);
115 if (count($split) > 1) {
116 array_shift($split);
117 $try[] = '.'.implode('.', $split);
118 }
119 foreach ($try as $h) {
120 if (array_key_exists($h, self::$config_cache)) {
121 self::debug("... cached ($h)");
122 return self::$config_cache[$h];
123 } elseif (file_exists(self::$config_path."/$h.txt")) {
124 self::debug("... from file ($h)");
125 $file = self::$config_path."/$h.txt";
126 break;
127 }
128 }
129 if (!isset($file)) {
130 if (isset(self::$config_path_fallback)) {
131 self::debug("... trying fallback ($host)");
132 foreach ($try as $h) {
133 if (file_exists(self::$config_path_fallback."/$h.txt")) {
134 self::debug("... from fallback file ($h)");
135 $file = self::$config_path_fallback."/$h.txt";
136 break;
137 }
138 }
139 if (!isset($file)) {
140 self::debug("... no match in fallback directory");
141 return false;
142 }
143 } else {
144 self::debug("... no match ($host)");
145 return false;
146 }
147 }
148 $config_file = file($file, FILE_IGNORE_NEW_LINES | FILE_SKIP_EMPTY_LINES);
149 if (!$config_file || !is_array($config_file)) return false;
150 $config = new SiteConfig();
151 foreach ($config_file as $line) {
152 $line = trim($line);
153
154 // skip comments, empty lines
155 if ($line == '' || $line[0] == '#') continue;
156
157 // get command
158 $command = explode(':', $line, 2);
159 // if there's no colon ':', skip this line
160 if (count($command) != 2) continue;
161 $val = trim($command[1]);
162 $command = trim($command[0]);
163 if ($command == '' || $val == '') continue;
164
165 // check for commands where we accept multiple statements
166 if (in_array($command, array('title', 'body', 'author', 'date', 'strip', 'strip_id_or_class', 'strip_image_src', 'single_page_link', 'single_page_link_in_feed', 'http_header'))) {
167 array_push($config->$command, $val);
168 // check for single statement commands that evaluate to true or false
169 } elseif (in_array($command, array('tidy', 'prune', 'autodetect_on_failure'))) {
170 $config->$command = ($val == 'yes');
171 // check for single statement commands stored as strings
172 } elseif (in_array($command, array('test_url', 'parser'))) {
173 $config->$command = $val;
174 } elseif ((substr($command, -1) == ')') && preg_match('!^([a-z0-9_]+)\((.*?)\)$!i', $command, $match)) {
175 if (in_array($match[1], array('replace_string'))) {
176 $command = $match[1];
177 array_push($config->$command, array($match[2], $val));
178 }
179 }
180 }
181 return $config;
182 }
183}
184?> \ No newline at end of file
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