page.php
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	<?php

	define('LONG_DATE_FORMAT', '%e %B %Y');
	define('USER_AGENT', 'WikimediaTools/SourceTemplatesGenerator/0.1');
	define('USER_AGENT_FALLBACK', 'Mozilla/5.0');

	class Page {
	public $url;

	/**
	* @var array Meta tags
	*/
	public $meta_tags;

	/**
	* @var string The page content
	*/
	public $data;

	public $title;
	public $author;
	public $yyyy;
	public $mm;
	public $dd;

	public $skipYMD;
	public $skipAuthor;

	public $error;

	function __construct ($url) {
	$this->url = $url;
	ini_set('user_agent', USER_AGENT);
	$this->data = @file_get_contents($url);
	if (!$this->data) {
	ini_set('user_agent', USER_AGENT_FALLBACK);
	if (!$this->data = @file_get_contents($url)) {
	$this->error = "Can't read URL";
	return;
	}
	}
	$this->analyse();
	}

	static function load ($url) {
	$pages = file('pages/index.dat', true);
	foreach ($pages as $line) {
	$page = explode("\t", $line);
	if (substr($url, 0, strlen($page[0])) == $page[0]) {
	$file = strtolower(trim($page[1])) . '.php';
	$class = trim($page[1]) . 'Page';

	require("pages/$file");
	return new $class($url);
	}
	}
	return new Page($url);
	}

	/**
	* Analyses metatags to process content
	*/
	function analyse () {
	$this->meta_tags = $this->get_meta_tags();
	$this->title = $this->get_title();

	if (array_key_exists('date', $this->meta_tags)) {
	$date = date_parse($this->meta_tags['date']);
	$this->yyyy = $date['year'];
	$this->mm = $date['month'];
	$this->dd = $date['day'];
	}
	}

	/**
	* Gets page metatags
	*
	* @return array an array where the keys are the metatags' names and the values the metatags' values
	*/
	function get_meta_tags () {
	return get_meta_tags($this->url);
	}

	/**
	* Gets all metatags, including those using meta property= and meta itemprop= syntax
	*
	* @return array an array where the keys are the metatags' names and the values the metatags' values
	*/
	function get_all_meta_tags () {
	//Thank you to Michael Knapp and Mariano
	//See http://php.net/manual/en/function.get-meta-tags.php comments
	preg_match_all('/<[\s]meta[\s]\b(name\|property\|itemprop)\b="?' . '([^>"])"?[\s]' . 'content="?([^>"])"?[\s][\/]?[\s]*>/si', $this->data, $match);

	if (isset($match) && is_array($match) && count($match) == 4) {
	$originals = $match[0];
	$names = $match[2];
	$values = $match[3];

	if (count($originals) == count($names) && count($names) == count($values)) {
	$metaTags = array();

	for ($i=0, $limiti = count($names) ; $i < $limiti ; $i++) {
	$metaTags[$names[$i]] = $values[$i];
	}
	}
	}

	return $metaTags;
	}

	/**
	* Gets title
	*
	* @return string The page title
	*/
	function get_title () {
	if (array_key_exists('title', $this->meta_tags)) return $this->meta_tags['title'];
	return (preg_match("#<title>(.+)<\/title>#iU", $this->data, $title)) ? trim($title[1]) : '';
	}

	/**
	* Determines if the current page is an article published in a journal.
	*
	* @return bool true if the current page is an article ; otherwise, false
	*/
	function is_article () {
	return
	(array_key_exists('dc_type', $this->meta_tags) && $this->meta_tags['dc_type'] == 'journalArticle')
	\|\|
	(array_key_exists('dcsext_pn-cat', $this->meta_tags) && $this->meta_tags['dcsext_pn-cat'] == 'Article')
	\|\|
	array_key_exists('citation_journal_title', $this->meta_tags)
	\|\|
	array_key_exists('prism_publicationname', $this->meta_tags);
	}

	/**
	* Gets relevant metatag
	*
	* @param array the metatags
	* @param string... the list of acceptable metatags
	*
	* @return string the first metatag value found
	*/
	static function getMetaTag () {
	$tags = func_get_args();
	$metatags = array_shift($tags);

	foreach ($tags as $tag) {
	if (array_key_exists($tag, $metatags)) {
	return $metatags[$tag];
	}
	}

	return '';
	}

	/**
	* Finds a portion of text included between $before and $after strings on the current page
	*
	* @param string $before The string at the left of the text to be grabbed
	* @param string $after The string at the right of the text to be grabbed
	*
	* @return string The text found between $before and $after
	*/
	function between ($before, $after) {
	return self::grab($this->data, $before, $after);
	}

	/**
	* Finds a portion of text included between $before and $after strings
	*
	* @param string $text The text where to find the substring
	* @param string $before The string at the left of the text to be grabbed
	* @param string $after The string at the right of the text to be grabbed
	*
	* @return string The text found between $before and $after
	*/
	static function grab ($text, $before, $after) {
	$pos1 = strpos($text, $before);
	if ($pos1 === false) { return false; } else { $pos1 += strlen($before); }

	$pos2 = strpos($text, $after, $pos1 + 1);
	if ($pos2 === false) { return false; }

	return substr($text, $pos1, $pos2 - $pos1);
	}
	}

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