Merge pull request #181 from inthepoche/dev

beta4

2 files changed, 796 insertions, 0 deletions

diff --git a/inc/3rdparty/content-extractor/ContentExtractor.php b/inc/3rdparty/content-extractor/ContentExtractor.php
new file mode 100644
index 00000000..db371c6a
--- /dev/null
+++ b/inc/3rdparty/content-extractor/ContentExtractor.php
@@ -0,0 +1,612 @@
+<?php
+/**
+ * Content Extractor
+ * 
+ * Uses patterns specified in site config files and auto detection (hNews/PHP Readability) 
+ * to extract content from HTML files.
+ * 
+ * @version 0.8
+ * @date 2012-02-21
+ * @author Keyvan Minoukadeh
+ * @copyright 2011 Keyvan Minoukadeh
+ * @license http://www.gnu.org/licenses/agpl-3.0.html AGPL v3
+ */
+
+class ContentExtractor
+{
+        protected static $tidy_config = array(
+                                 'clean' => true,
+                                 'output-xhtml' => true,
+                                 'logical-emphasis' => true,
+                                 'show-body-only' => false,
+                                 'new-blocklevel-tags' => 'article, aside, footer, header, hgroup, menu, nav, section, details, datagrid',
+                                 'new-inline-tags' => 'mark, time, meter, progress, data',
+                                 'wrap' => 0,
+                                 'drop-empty-paras' => true,
+                                 'drop-proprietary-attributes' => false,
+                                 'enclose-text' => true,
+                                 'enclose-block-text' => true,
+                                 'merge-divs' => true,
+                                 'merge-spans' => true,
+                                 'char-encoding' => 'utf8',
+                                 'hide-comments' => true
+                                 );
+        protected $html;
+        protected $config;
+        protected $title;
+        protected $author = array();
+        protected $language;
+        protected $date;
+        protected $body;
+        protected $success = false;
+        public $fingerprints = array();
+        public $readability;
+        public $debug = false;
+
+        function __construct($path, $fallback=null) {
+                SiteConfig::set_config_path($path, $fallback);  
+        }
+        
+        protected function debug($msg) {
+                if ($this->debug) {
+                        $mem = round(memory_get_usage()/1024, 2);
+                        $memPeak = round(memory_get_peak_usage()/1024, 2);
+                        echo '* ',$msg;
+                        echo ' - mem used: ',$mem," (peak: $memPeak)\n";        
+                        ob_flush();
+                        flush();
+                }
+        }
+        
+        public function reset() {
+                $this->html = null;
+                $this->readability = null;
+                $this->config = null;
+                $this->title = null;
+                $this->body = null;
+                $this->author = array();
+                $this->language = null;
+                $this->date = null;
+                $this->success = false;
+        }
+
+        public function findHostUsingFingerprints($html) {
+                $this->debug('Checking fingerprints...');
+                $head = substr($html, 0, 8000);
+                foreach ($this->fingerprints as $_fp => $_fphost) {
+                        $lookin = 'html';
+                        if (is_array($_fphost)) {
+                                if (isset($_fphost['head']) && $_fphost['head']) {
+                                        $lookin = 'head';
+                                }
+                                $_fphost = $_fphost['hostname'];
+                        }
+                        if (strpos($$lookin, $_fp) !== false) {
+                                $this->debug("Found match: $_fphost");
+                                return $_fphost;
+                        }
+                }
+                return false;
+        }
+        
+        // returns true on success, false on failure
+        // $smart_tidy indicates that if tidy is used and no results are produced, we will
+        // try again without it. Tidy helps us deal with PHP's patchy HTML parsing most of the time
+        // but it has problems of its own which we try to avoid with this option.
+        public function process($html, $url, $smart_tidy=true) {
+                $this->reset();
+                // extract host name
+                $host = @parse_url($url, PHP_URL_HOST);
+                if (!($this->config = SiteConfig::build($host))) {
+                        // no match, check HTML for fingerprints
+                        if (!empty($this->fingerprints) && ($_fphost = $this->findHostUsingFingerprints($html))) {
+                                $this->config = SiteConfig::build($_fphost);
+                        }
+                        unset($_fphost);
+                        if (!$this->config) {
+                                // no match, so use defaults
+                                $this->config = new SiteConfig();
+                        }
+                }
+                // store copy of config in our static cache array in case we need to process another URL
+                SiteConfig::add_to_cache($host, $this->config);
+                
+                // do string replacements
+                foreach ($this->config->replace_string as $_repl) {
+                        $html = str_replace($_repl[0], $_repl[1], $html);
+                }
+                unset($_repl);
+                
+                // use tidy (if it exists)?
+                // This fixes problems with some sites which would otherwise
+                // trouble DOMDocument's HTML parsing. (Although sometimes it
+                // makes matters worse, which is why you can override it in site config files.)
+                $tidied = false;
+                if ($this->config->tidy && function_exists('tidy_parse_string') && $smart_tidy) {
+                        $this->debug('Using Tidy');
+                        $tidy = tidy_parse_string($html, self::$tidy_config, 'UTF8');
+                        if (tidy_clean_repair($tidy)) {
+                                $original_html = $html;
+                                $tidied = true;
+                                // $html = $tidy->value;
+                        }
+                        $body = $tidy->body();
+                        if (preg_replace('/\s+/', '', $body->value) !== "<body></body>") {
+                                $html = $tidy->value; 
+                        }
+                        unset($tidy);
+                }
+                
+                // load and parse html
+                $this->readability = new Readability($html, $url);              
+                
+                // we use xpath to find elements in the given HTML document
+                // see http://en.wikipedia.org/wiki/XPath_1.0
+                $xpath = new DOMXPath($this->readability->dom);
+
+                // try to get title
+                foreach ($this->config->title as $pattern) {
+                        $elems = @$xpath->evaluate($pattern, $this->readability->dom);
+                        if (is_string($elems)) {
+                                $this->debug('Title expression evaluated as string');
+                                $this->title = trim($elems);
+                                break;
+                        } elseif ($elems instanceof DOMNodeList && $elems->length > 0) {
+                                $this->debug('Title matched');
+                                $this->title = $elems->item(0)->textContent;
+                                // remove title from document
+                                try {
+                                        $elems->item(0)->parentNode->removeChild($elems->item(0));
+                                } catch (DOMException $e) {
+                                        // do nothing
+                                }
+                                break;
+                        }
+                }
+                
+                // try to get author (if it hasn't already been set)
+                if (empty($this->author)) {
+                        foreach ($this->config->author as $pattern) {
+                                $elems = @$xpath->evaluate($pattern, $this->readability->dom);
+                                if (is_string($elems)) {
+                                        $this->debug('Author expression evaluated as string');
+                                        if (trim($elems) != '') {
+                                                $this->author[] = trim($elems);
+                                                break;
+                                        }
+                                } elseif ($elems instanceof DOMNodeList && $elems->length > 0) {
+                                        foreach ($elems as $elem) {
+                                                if (!isset($elem->parentNode)) continue;
+                                                $this->author[] = trim($elem->textContent);
+                                        }
+                                        if (!empty($this->author)) break;
+                                }
+                        }
+                }
+                
+                // try to get language
+                $_lang_xpath = array('//html[@lang]/@lang', '//meta[@name="DC.language"]/@content');
+                foreach ($_lang_xpath as $pattern) {
+                        $elems = @$xpath->evaluate($pattern, $this->readability->dom);
+                        if (is_string($elems)) {
+                                if (trim($elems) != '') {
+                                        $this->language = trim($elems);
+                                        break;
+                                }
+                        } elseif ($elems instanceof DOMNodeList && $elems->length > 0) {
+                                foreach ($elems as $elem) {
+                                        if (!isset($elem->parentNode)) continue;
+                                        $this->language = trim($elem->textContent);
+                                }
+                                if ($this->language) break;
+                        }
+                }
+                
+                // try to get date
+                foreach ($this->config->date as $pattern) {
+                        $elems = @$xpath->evaluate($pattern, $this->readability->dom);
+                        if (is_string($elems)) {
+                                $this->debug('Date expression evaluated as string');
+                                $this->date = strtotime(trim($elems, "; \t\n\r\0\x0B"));
+                        } elseif ($elems instanceof DOMNodeList && $elems->length > 0) {
+                                $this->debug('Date matched');
+                                $this->date = $elems->item(0)->textContent;
+                                $this->date = strtotime(trim($this->date, "; \t\n\r\0\x0B"));
+                                // remove date from document
+                                // $elems->item(0)->parentNode->removeChild($elems->item(0));
+                        }
+                        if (!$this->date) {
+                                $this->date = null;
+                        } else {
+                                break;
+                        }
+                }
+
+                // strip elements (using xpath expressions)
+                foreach ($this->config->strip as $pattern) {
+                        $elems = @$xpath->query($pattern, $this->readability->dom);
+                        // check for matches
+                        if ($elems && $elems->length > 0) {
+                                $this->debug('Stripping '.$elems->length.' elements (strip)');
+                                for ($i=$elems->length-1; $i >= 0; $i--) {
+                                        $elems->item($i)->parentNode->removeChild($elems->item($i));
+                                }
+                        }
+                }
+                
+                // strip elements (using id and class attribute values)
+                foreach ($this->config->strip_id_or_class as $string) {
+                        $string = strtr($string, array("'"=>'', '"'=>''));
+                        $elems = @$xpath->query("//*[contains(@class, '$string') or contains(@id, '$string')]", $this->readability->dom);
+                        // check for matches
+                        if ($elems && $elems->length > 0) {
+                                $this->debug('Stripping '.$elems->length.' elements (strip_id_or_class)');
+                                for ($i=$elems->length-1; $i >= 0; $i--) {
+                                        $elems->item($i)->parentNode->removeChild($elems->item($i));
+                                }
+                        }
+                }
+                
+                // strip images (using src attribute values)
+                foreach ($this->config->strip_image_src as $string) {
+                        $string = strtr($string, array("'"=>'', '"'=>''));
+                        $elems = @$xpath->query("//img[contains(@src, '$string')]", $this->readability->dom);
+                        // check for matches
+                        if ($elems && $elems->length > 0) {
+                                $this->debug('Stripping '.$elems->length.' image elements');
+                                for ($i=$elems->length-1; $i >= 0; $i--) {
+                                        $elems->item($i)->parentNode->removeChild($elems->item($i));
+                                }
+                        }
+                }
+                // strip elements using Readability.com and Instapaper.com ignore class names
+                // .entry-unrelated and .instapaper_ignore
+                // See https://www.readability.com/publishers/guidelines/#view-plainGuidelines
+                // and http://blog.instapaper.com/post/730281947
+                $elems = @$xpath->query("//*[contains(concat(' ',normalize-space(@class),' '),' entry-unrelated ') or contains(concat(' ',normalize-space(@class),' '),' instapaper_ignore ')]", $this->readability->dom);
+                // check for matches
+                if ($elems && $elems->length > 0) {
+                        $this->debug('Stripping '.$elems->length.' .entry-unrelated,.instapaper_ignore elements');
+                        for ($i=$elems->length-1; $i >= 0; $i--) {
+                                $elems->item($i)->parentNode->removeChild($elems->item($i));
+                        }
+                }
+                
+                // strip elements that contain style="display: none;"
+                $elems = @$xpath->query("//*[contains(@style,'display:none')]", $this->readability->dom);
+                // check for matches
+                if ($elems && $elems->length > 0) {
+                        $this->debug('Stripping '.$elems->length.' elements with inline display:none style');
+                        for ($i=$elems->length-1; $i >= 0; $i--) {
+                                $elems->item($i)->parentNode->removeChild($elems->item($i));
+                        }
+                }
+                
+                // try to get body
+                foreach ($this->config->body as $pattern) {
+                        $elems = @$xpath->query($pattern, $this->readability->dom);
+                        // check for matches
+                        if ($elems && $elems->length > 0) {
+                                $this->debug('Body matched');
+                                if ($elems->length == 1) {                              
+                                        $this->body = $elems->item(0);
+                                        // prune (clean up elements that may not be content)
+                                        if ($this->config->prune) {
+                                                $this->debug('Pruning content');
+                                                $this->readability->prepArticle($this->body);
+                                        }
+                                        break;
+                                } else {
+                                        $this->body = $this->readability->dom->createElement('div');
+                                        $this->debug($elems->length.' body elems found');
+                                        foreach ($elems as $elem) {
+                                                if (!isset($elem->parentNode)) continue;
+                                                $isDescendant = false;
+                                                foreach ($this->body->childNodes as $parent) {
+                                                        if ($this->isDescendant($parent, $elem)) {
+                                                                $isDescendant = true;
+                                                                break;
+                                                        }
+                                                }
+                                                if ($isDescendant) {
+                                                        $this->debug('Element is child of another body element, skipping.');
+                                                } else {
+                                                        // prune (clean up elements that may not be content)
+                                                        if ($this->config->prune) {
+                                                                $this->debug('Pruning content');
+                                                                $this->readability->prepArticle($elem);
+                                                        }
+                                                        $this->debug('Element added to body');
+                                                        $this->body->appendChild($elem);
+                                                }
+                                        }
+                                }
+                        }
+                }               
+                
+                // auto detect?
+                $detect_title = $detect_body = $detect_author = $detect_date = false;
+                // detect title?
+                if (!isset($this->title)) {
+                        if (empty($this->config->title) || $this->config->autodetect_on_failure) {
+                                $detect_title = true;
+                        }
+                }
+                // detect body?
+                if (!isset($this->body)) {
+                        if (empty($this->config->body) || $this->config->autodetect_on_failure) {
+                                $detect_body = true;
+                        }
+                }
+                // detect author?
+                if (empty($this->author)) {
+                        if (empty($this->config->author) || $this->config->autodetect_on_failure) {
+                                $detect_author = true;
+                        }
+                }
+                // detect date?
+                if (!isset($this->date)) {
+                        if (empty($this->config->date) || $this->config->autodetect_on_failure) {
+                                $detect_date = true;
+                        }
+                }
+
+                // check for hNews
+                if ($detect_title || $detect_body) {
+                        // check for hentry
+                        $elems = @$xpath->query("//*[contains(concat(' ',normalize-space(@class),' '),' hentry ')]", $this->readability->dom);
+                        if ($elems && $elems->length > 0) {
+                                $this->debug('hNews: found hentry');
+                                $hentry = $elems->item(0);
+                                
+                                if ($detect_title) {
+                                        // check for entry-title
+                                        $elems = @$xpath->query(".//*[contains(concat(' ',normalize-space(@class),' '),' entry-title ')]", $hentry);
+                                        if ($elems && $elems->length > 0) {
+                                                $this->debug('hNews: found entry-title');
+                                                $this->title = $elems->item(0)->textContent;
+                                                // remove title from document
+                                                $elems->item(0)->parentNode->removeChild($elems->item(0));
+                                                $detect_title = false;
+                                        }
+                                }
+                                
+                                if ($detect_date) {
+                                        // check for time element with pubdate attribute
+                                        $elems = @$xpath->query(".//time[@pubdate] | .//abbr[contains(concat(' ',normalize-space(@class),' '),' published ')]", $hentry);
+                                        if ($elems && $elems->length > 0) {
+                                                $this->debug('hNews: found publication date');
+                                                $this->date = strtotime(trim($elems->item(0)->textContent));
+                                                // remove date from document
+                                                //$elems->item(0)->parentNode->removeChild($elems->item(0));
+                                                if ($this->date) {
+                                                        $detect_date = false;
+                                                } else {
+                                                        $this->date = null;
+                                                }
+                                        }
+                                }
+
+                                if ($detect_author) {
+                                        // check for time element with pubdate attribute
+                                        $elems = @$xpath->query(".//*[contains(concat(' ',normalize-space(@class),' '),' vcard ') and (contains(concat(' ',normalize-space(@class),' '),' author ') or contains(concat(' ',normalize-space(@class),' '),' byline '))]", $hentry);
+                                        if ($elems && $elems->length > 0) {
+                                                $this->debug('hNews: found author');
+                                                $author = $elems->item(0);
+                                                $fn = @$xpath->query(".//*[contains(concat(' ',normalize-space(@class),' '),' fn ')]", $author);
+                                                if ($fn && $fn->length > 0) {
+                                                        foreach ($fn as $_fn) {
+                                                                if (trim($_fn->textContent) != '') {
+                                                                        $this->author[] = trim($_fn->textContent);
+                                                                }
+                                                        }
+                                                } else {
+                                                        if (trim($author->textContent) != '') {
+                                                                $this->author[] = trim($author->textContent);
+                                                        }
+                                                }
+                                                $detect_author = empty($this->author);
+                                        }
+                                }
+                                
+                                // check for entry-content.
+                                // according to hAtom spec, if there are multiple elements marked entry-content,
+                                // we include all of these in the order they appear - see http://microformats.org/wiki/hatom#Entry_Content
+                                if ($detect_body) {
+                                        $elems = @$xpath->query(".//*[contains(concat(' ',normalize-space(@class),' '),' entry-content ')]", $hentry);
+                                        if ($elems && $elems->length > 0) {
+                                                $this->debug('hNews: found entry-content');
+                                                if ($elems->length == 1) {
+                                                        // what if it's empty? (some sites misuse hNews - place their content outside an empty entry-content element)
+                                                        $e = $elems->item(0);
+                                                        if (($e->tagName == 'img') || (trim($e->textContent) != '')) {
+                                                                $this->body = $elems->item(0);
+                                                                // prune (clean up elements that may not be content)
+                                                                if ($this->config->prune) {
+                                                                        $this->debug('Pruning content');
+                                                                        $this->readability->prepArticle($this->body);
+                                                                }
+                                                                $detect_body = false;
+                                                        } else {
+                                                                $this->debug('hNews: skipping entry-content - appears not to contain content');
+                                                        }
+                                                        unset($e);
+                                                } else {
+                                                        $this->body = $this->readability->dom->createElement('div');
+                                                        $this->debug($elems->length.' entry-content elems found');
+                                                        foreach ($elems as $elem) {
+                                                                if (!isset($elem->parentNode)) continue;
+                                                                $isDescendant = false;
+                                                                foreach ($this->body->childNodes as $parent) {
+                                                                        if ($this->isDescendant($parent, $elem)) {
+                                                                                $isDescendant = true;
+                                                                                break;
+                                                                        }
+                                                                }
+                                                                if ($isDescendant) {
+                                                                        $this->debug('Element is child of another body element, skipping.');
+                                                                } else {
+                                                                        // prune (clean up elements that may not be content)
+                                                                        if ($this->config->prune) {
+                                                                                $this->debug('Pruning content');
+                                                                                $this->readability->prepArticle($elem);
+                                                                        }                                                               
+                                                                        $this->debug('Element added to body');                                                                  
+                                                                        $this->body->appendChild($elem);
+                                                                }
+                                                        }
+                                                        $detect_body = false;
+                                                }
+                                        }
+                                }
+                        }
+                }
+
+                // check for elements marked with instapaper_title
+                if ($detect_title) {
+                        // check for instapaper_title
+                        $elems = @$xpath->query("//*[contains(concat(' ',normalize-space(@class),' '),' instapaper_title ')]", $this->readability->dom);
+                        if ($elems && $elems->length > 0) {
+                                $this->debug('title found (.instapaper_title)');
+                                $this->title = $elems->item(0)->textContent;
+                                // remove title from document
+                                $elems->item(0)->parentNode->removeChild($elems->item(0));
+                                $detect_title = false;
+                        }
+                }
+                // check for elements marked with instapaper_body
+                if ($detect_body) {
+                        $elems = @$xpath->query("//*[contains(concat(' ',normalize-space(@class),' '),' instapaper_body ')]", $this->readability->dom);
+                        if ($elems && $elems->length > 0) {
+                                $this->debug('body found (.instapaper_body)');
+                                $this->body = $elems->item(0);
+                                // prune (clean up elements that may not be content)
+                                if ($this->config->prune) {
+                                        $this->debug('Pruning content');
+                                        $this->readability->prepArticle($this->body);
+                                }
+                                $detect_body = false;
+                        }
+                }
+                
+                // Find author in rel="author" marked element
+                // We only use this if there's exactly one.
+                // If there's more than one, it could indicate more than
+                // one author, but it could also indicate that we're processing
+                // a page listing different articles with different authors.
+                if ($detect_author) {
+                        $elems = @$xpath->query("//a[contains(concat(' ',normalize-space(@rel),' '),' author ')]", $this->readability->dom);
+                        if ($elems && $elems->length == 1) {
+                                $this->debug('Author found (rel="author")');
+                                $author = trim($elems->item(0)->textContent);
+                                if ($author != '') {
+                                        $this->author[] = $author;
+                                        $detect_author = false;
+                                }
+                        }
+                }
+
+                // Find date in pubdate marked time element
+                // For the same reason given above, we only use this
+                // if there's exactly one element.
+                if ($detect_date) {
+                        $elems = @$xpath->query("//time[@pubdate]", $this->readability->dom);
+                        if ($elems && $elems->length == 1) {
+                                $this->debug('Date found (pubdate marked time element)');
+                                $this->date = strtotime(trim($elems->item(0)->textContent));
+                                // remove date from document
+                                //$elems->item(0)->parentNode->removeChild($elems->item(0));
+                                if ($this->date) {
+                                        $detect_date = false;
+                                } else {
+                                        $this->date = null;
+                                }
+                        }
+                }
+
+                // still missing title or body, so we detect using Readability
+                if ($detect_title || $detect_body) {
+                        $this->debug('Using Readability');
+                        // clone body if we're only using Readability for title (otherwise it may interfere with body element)
+                        if (isset($this->body)) $this->body = $this->body->cloneNode(true);
+                        $success = $this->readability->init();
+                }
+                if ($detect_title) {
+                        $this->debug('Detecting title');
+                        $this->title = $this->readability->getTitle()->textContent;
+                }
+                if ($detect_body && $success) {
+                        $this->debug('Detecting body');
+                        $this->body = $this->readability->getContent();
+                        if ($this->body->childNodes->length == 1 && $this->body->firstChild->nodeType === XML_ELEMENT_NODE) {
+                                $this->body = $this->body->firstChild;
+                        }
+                        // prune (clean up elements that may not be content)
+                        if ($this->config->prune) {
+                                $this->debug('Pruning content');
+                                $this->readability->prepArticle($this->body);
+                        }
+                }
+                if (isset($this->body)) {
+                        // remove scripts
+                        $this->readability->removeScripts($this->body);
+                        // remove any h1-h6 elements that appear as first thing in the body
+                        // and which match our title
+                        if (isset($this->title) && ($this->title != '')) {
+                                $firstChild = $this->body->firstChild;
+                                while ($firstChild->nodeType && ($firstChild->nodeType !== XML_ELEMENT_NODE)) {
+                                        $firstChild = $firstChild->nextSibling;
+                                }
+                                if (($firstChild->nodeType === XML_ELEMENT_NODE)
+                                        && in_array(strtolower($firstChild->tagName), array('h1', 'h2', 'h3', 'h4', 'h5', 'h6'))
+                                        && (strtolower(trim($firstChild->textContent)) == strtolower(trim($this->title)))) {
+                                                $this->body->removeChild($firstChild);
+                                }
+                        }
+                        $this->success = true;
+                }
+                
+                // if we've had no success and we've used tidy, there's a chance
+                // that tidy has messed up. So let's try again without tidy...
+                if (!$this->success && $tidied && $smart_tidy) {
+                        $this->debug('Trying again without tidy');
+                        $this->process($original_html, $url, false);
+                }
+
+                return $this->success;
+        }
+        
+        private function isDescendant(DOMElement $parent, DOMElement $child) {
+                $node = $child->parentNode;
+                while ($node != null) {
+                        if ($node->isSameNode($parent)) return true;
+                        $node = $node->parentNode;
+                }
+                return false;
+        }
+
+        public function getContent() {
+                return $this->body;
+        }
+        
+        public function getTitle() {
+                return $this->title;
+        }
+        
+        public function getAuthors() {
+                return $this->author;
+        }
+        
+        public function getLanguage() {
+                return $this->language;
+        }
+        
+        public function getDate() {
+                return $this->date;
+        }
+        
+        public function getSiteConfig() {
+                return $this->config;
+        }
+}
+?>
\ No newline at end of file
diff --git a/inc/3rdparty/content-extractor/SiteConfig.php b/inc/3rdparty/content-extractor/SiteConfig.php
new file mode 100644
index 00000000..089e10c6
--- /dev/null
+++ b/inc/3rdparty/content-extractor/SiteConfig.php
@@ -0,0 +1,184 @@
+<?php
+/**
+ * Site Config
+ * 
+ * Each instance of this class should hold extraction patterns and other directives
+ * for a website. See ContentExtractor class to see how it's used.
+ * 
+ * @version 0.6
+ * @date 2011-10-30
+ * @author Keyvan Minoukadeh
+ * @copyright 2011 Keyvan Minoukadeh
+ * @license http://www.gnu.org/licenses/agpl-3.0.html AGPL v3
+ */
+
+class SiteConfig
+{
+        // Use first matching element as title (0 or more xpath expressions)
+        public $title = array();
+        
+        // Use first matching element as body (0 or more xpath expressions)
+        public $body = array();
+        
+        // Use first matching element as author (0 or more xpath expressions)
+        public $author = array();
+        
+        // Use first matching element as date (0 or more xpath expressions)
+        public $date = array();
+        
+        // Strip elements matching these xpath expressions (0 or more)
+        public $strip = array();
+        
+        // Strip elements which contain these strings (0 or more) in the id or class attribute 
+        public $strip_id_or_class = array();
+        
+        // Strip images which contain these strings (0 or more) in the src attribute 
+        public $strip_image_src = array();
+        
+        // Additional HTTP headers to send
+        // NOT YET USED
+        public $http_header = array();
+        
+        // Process HTML with tidy before creating DOM
+        public $tidy = true;
+        
+        // Autodetect title/body if xpath expressions fail to produce results.
+        // Note that this applies to title and body separately, ie. 
+        //   * if we get a body match but no title match, this option will determine whether we autodetect title 
+        //   * if neither match, this determines whether we autodetect title and body.
+        // Also note that this only applies when there is at least one xpath expression in title or body, ie.
+        //   * if title and body are both empty (no xpath expressions), this option has no effect (both title and body will be auto-detected)
+        //   * 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.
+        // 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).
+        public $autodetect_on_failure = true;
+        
+        // Clean up content block - attempt to remove elements that appear to be superfluous
+        public $prune = true;
+        
+        // Test URL - if present, can be used to test the config above
+        public $test_url = null;
+        
+        // Single-page link - should identify a link element or URL pointing to the page holding the entire article
+        // This is useful for sites which split their articles across multiple pages. Links to such pages tend to 
+        // display the first page with links to the other pages at the bottom. Often there is also a link to a page
+        // which displays the entire article on one page (e.g. 'print view').
+        // This should be an XPath expression identifying the link to that page. If present and we find a match,
+        // we will retrieve that page and the rest of the options in this config will be applied to the new page.
+        public $single_page_link = array();
+        
+        // Single-page link in feed? - same as above, but patterns applied to item description HTML taken from feed
+        public $single_page_link_in_feed = array();
+        
+        // TODO: which parser to use for turning raw HTML into a DOMDocument
+        public $parser = 'libxml';
+        
+        // String replacement to be made on HTML before processing begins
+        public $replace_string = array();
+        
+        // the options below cannot be set in the config files which this class represents
+        
+        public static $debug = false;
+        protected static $config_path;
+        protected static $config_path_fallback;
+        protected static $config_cache = array();
+        const HOSTNAME_REGEX = '/^(([a-zA-Z0-9-]*[a-zA-Z0-9])\.)*([A-Za-z0-9-]*[A-Za-z0-9])$/';
+        
+        protected static function debug($msg) {
+                if (self::$debug) {
+                        $mem = round(memory_get_usage()/1024, 2);
+                        $memPeak = round(memory_get_peak_usage()/1024, 2);
+                        echo '* ',$msg;
+                        echo ' - mem used: ',$mem," (peak: $memPeak)\n";        
+                        ob_flush();
+                        flush();
+                }
+        }       
+        
+        public static function set_config_path($path, $fallback=null) {
+                self::$config_path = $path;
+                self::$config_path_fallback = $fallback;
+        }
+        
+        public static function add_to_cache($host, SiteConfig $config) {
+                $host = strtolower($host);
+                self::$config_cache[$host] = $config;   
+        }
+        
+        // returns SiteConfig instance if an appropriate one is found, false otherwise
+        public static function build($host) {
+                $host = strtolower($host);
+                if (substr($host, 0, 4) == 'www.') $host = substr($host, 4);
+                if (!$host || (strlen($host) > 200) || !preg_match(self::HOSTNAME_REGEX, $host)) return false;
+                // check for site configuration
+                $try = array($host);
+                $split = explode('.', $host);
+                if (count($split) > 1) {
+                        array_shift($split);
+                        $try[] = '.'.implode('.', $split);
+                }
+                foreach ($try as $h) {
+                        if (array_key_exists($h, self::$config_cache)) {
+                                self::debug("... cached ($h)");
+                                return self::$config_cache[$h];
+                        } elseif (file_exists(self::$config_path."/$h.txt")) {
+                                self::debug("... from file ($h)");
+                                $file = self::$config_path."/$h.txt";
+                                break;
+                        }
+                }
+                if (!isset($file)) {
+                        if (isset(self::$config_path_fallback)) {
+                                self::debug("... trying fallback ($host)");
+                                foreach ($try as $h) {
+                                        if (file_exists(self::$config_path_fallback."/$h.txt")) {
+                                                self::debug("... from fallback file ($h)");
+                                                $file = self::$config_path_fallback."/$h.txt";
+                                                break;
+                                        }
+                                }
+                                if (!isset($file)) {
+                                        self::debug("... no match in fallback directory");
+                                        return false;
+                                }
+                        } else {
+                                self::debug("... no match ($host)");
+                                return false;
+                        }
+                }
+                $config_file = file($file, FILE_IGNORE_NEW_LINES | FILE_SKIP_EMPTY_LINES);
+                if (!$config_file || !is_array($config_file)) return false;
+                $config = new SiteConfig();
+                foreach ($config_file as $line) {
+                        $line = trim($line);
+                        
+                        // skip comments, empty lines
+                        if ($line == '' || $line[0] == '#') continue;
+                        
+                        // get command
+                        $command = explode(':', $line, 2);
+                        // if there's no colon ':', skip this line
+                        if (count($command) != 2) continue;
+                        $val = trim($command[1]);
+                        $command = trim($command[0]);
+                        if ($command == '' || $val == '') continue;
+                        
+                        // check for commands where we accept multiple statements
+                        if (in_array($command, array('title', 'body', 'author', 'date', 'strip', 'strip_id_or_class', 'strip_image_src', 'single_page_link', 'single_page_link_in_feed', 'http_header'))) {
+                                array_push($config->$command, $val);
+                        // check for single statement commands that evaluate to true or false
+                        } elseif (in_array($command, array('tidy', 'prune', 'autodetect_on_failure'))) {
+                                $config->$command = ($val == 'yes');
+                        // check for single statement commands stored as strings
+                        } elseif (in_array($command, array('test_url', 'parser'))) {
+                                $config->$command = $val;
+                        } elseif ((substr($command, -1) == ')') && preg_match('!^([a-z0-9_]+)\((.*?)\)$!i', $command, $match)) {
+                                if (in_array($match[1], array('replace_string'))) {
+                                        $command = $match[1];
+                                        array_push($config->$command, array($match[2], $val));
+                                }
+                        }
+                }
+                return $config;
+        }
+}
+?>
\ No newline at end of file