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<?php
/**
* Zend Framework
*
* LICENSE
*
* This source file is subject to the new BSD license that is bundled
* with this package in the file LICENSE.txt.
* It is also available through the world-wide-web at this URL:
* http://framework.zend.com/license/new-bsd
* If you did not receive a copy of the license and are unable to
* obtain it through the world-wide-web, please send an email
* to license@zend.com so we can send you a copy immediately.
*
* @category Zend
* @package Zend_Search_Lucene
* @subpackage Document
* @copyright Copyright (c) 2005-2009 Zend Technologies USA Inc. (http://www.zend.com)
* @license http://framework.zend.com/license/new-bsd New BSD License
* @version $Id: Html.php 18951 2009-11-12 16:26:19Z alexander $
*/
/** Zend_Search_Lucene_Document */
require_once 'Zend/Search/Lucene/Document.php';
/**
* HTML document.
*
* @category Zend
* @package Zend_Search_Lucene
* @subpackage Document
* @copyright Copyright (c) 2005-2009 Zend Technologies USA Inc. (http://www.zend.com)
* @license http://framework.zend.com/license/new-bsd New BSD License
*/
class Zend_Search_Lucene_Document_Html extends Zend_Search_Lucene_Document
{
/**
* List of document links
*
* @var array
*/
private $_links = array();
/**
* List of document header links
*
* @var array
*/
private $_headerLinks = array();
/**
* Stored DOM representation
*
* @var DOMDocument
*/
private $_doc;
/**
* Exclud nofollow links flag
*
* If true then links with rel='nofollow' attribute are not included into
* document links.
*
* @var boolean
*/
private static $_excludeNoFollowLinks = false;
/**
* Object constructor
*
* @param string $data HTML string (may be HTML fragment, )
* @param boolean $isFile
* @param boolean $storeContent
* @param string $defaultEncoding HTML encoding, is used if it's not specified using Content-type HTTP-EQUIV meta tag.
*/
private function __construct($data, $isFile, $storeContent, $defaultEncoding = '')
{
$this->_doc = new DOMDocument();
$this->_doc->substituteEntities = true;
if ($isFile) {
$htmlData = file_get_contents($data);
} else {
$htmlData = $data;
}
@$this->_doc->loadHTML($htmlData);
if ($this->_doc->encoding === null) {
// Document encoding is not recognized
/** @todo improve HTML vs HTML fragment recognition */
if (preg_match('/<html>/i', $htmlData, $matches, PREG_OFFSET_CAPTURE)) {
// It's an HTML document
// Add additional HEAD section and recognize document
$htmlTagOffset = $matches[0][1] + strlen($matches[0][0]);
@$this->_doc->loadHTML(iconv($defaultEncoding, 'UTF-8//IGNORE', substr($htmlData, 0, $htmlTagOffset))
. '<head><META HTTP-EQUIV="Content-type" CONTENT="text/html; charset=UTF-8"/></head>'
. iconv($defaultEncoding, 'UTF-8//IGNORE', substr($htmlData, $htmlTagOffset)));
// Remove additional HEAD section
$xpath = new DOMXPath($this->_doc);
$head = $xpath->query('/html/head')->item(0);
$head->parentNode->removeChild($head);
} else {
// It's an HTML fragment
@$this->_doc->loadHTML('<html><head><META HTTP-EQUIV="Content-type" CONTENT="text/html; charset=UTF-8"/></head><body>'
. iconv($defaultEncoding, 'UTF-8//IGNORE', $htmlData)
. '</body></html>');
}
}
/** @todo Add correction of wrong HTML encoding recognition processing
* The case is:
* Content-type HTTP-EQUIV meta tag is presented, but ISO-8859-5 encoding is actually used,
* even $this->_doc->encoding demonstrates another recognized encoding
*/
$xpath = new DOMXPath($this->_doc);
$docTitle = '';
$titleNodes = $xpath->query('/html/head/title');
foreach ($titleNodes as $titleNode) {
// title should always have only one entry, but we process all nodeset entries
$docTitle .= $titleNode->nodeValue . ' ';
}
$this->addField(Zend_Search_Lucene_Field::Text('title', $docTitle, 'UTF-8'));
$metaNodes = $xpath->query('/html/head/meta[@name]');
foreach ($metaNodes as $metaNode) {
$this->addField(Zend_Search_Lucene_Field::Text($metaNode->getAttribute('name'),
$metaNode->getAttribute('content'),
'UTF-8'));
}
$docBody = '';
$bodyNodes = $xpath->query('/html/body');
foreach ($bodyNodes as $bodyNode) {
// body should always have only one entry, but we process all nodeset entries
$this->_retrieveNodeText($bodyNode, $docBody);
}
if ($storeContent) {
$this->addField(Zend_Search_Lucene_Field::Text('body', $docBody, 'UTF-8'));
} else {
$this->addField(Zend_Search_Lucene_Field::UnStored('body', $docBody, 'UTF-8'));
}
$linkNodes = $this->_doc->getElementsByTagName('a');
foreach ($linkNodes as $linkNode) {
if (($href = $linkNode->getAttribute('href')) != '' &&
(!self::$_excludeNoFollowLinks || strtolower($linkNode->getAttribute('rel')) != 'nofollow' )
) {
$this->_links[] = $href;
}
}
$this->_links = array_unique($this->_links);
$linkNodes = $xpath->query('/html/head/link');
foreach ($linkNodes as $linkNode) {
if (($href = $linkNode->getAttribute('href')) != '') {
$this->_headerLinks[] = $href;
}
}
$this->_headerLinks = array_unique($this->_headerLinks);
}
/**
* Set exclude nofollow links flag
*
* @param boolean $newValue
*/
public static function setExcludeNoFollowLinks($newValue)
{
self::$_excludeNoFollowLinks = $newValue;
}
/**
* Get exclude nofollow links flag
*
* @return boolean
*/
public static function getExcludeNoFollowLinks()
{
return self::$_excludeNoFollowLinks;
}
/**
* Get node text
*
* We should exclude scripts, which may be not included into comment tags, CDATA sections,
*
* @param DOMNode $node
* @param string &$text
*/
private function _retrieveNodeText(DOMNode $node, &$text)
{
if ($node->nodeType == XML_TEXT_NODE) {
$text .= $node->nodeValue ;
$text .= ' ';
} else if ($node->nodeType == XML_ELEMENT_NODE && $node->nodeName != 'script') {
foreach ($node->childNodes as $childNode) {
$this->_retrieveNodeText($childNode, $text);
}
}
}
/**
* Get document HREF links
*
* @return array
*/
public function getLinks()
{
return $this->_links;
}
/**
* Get document header links
*
* @return array
*/
public function getHeaderLinks()
{
return $this->_headerLinks;
}
/**
* Load HTML document from a string
*
* @param string $data
* @param boolean $storeContent
* @param string $defaultEncoding HTML encoding, is used if it's not specified using Content-type HTTP-EQUIV meta tag.
* @return Zend_Search_Lucene_Document_Html
*/
public static function loadHTML($data, $storeContent = false, $defaultEncoding = '')
{
return new Zend_Search_Lucene_Document_Html($data, false, $storeContent, $defaultEncoding);
}
/**
* Load HTML document from a file
*
* @param string $file
* @param boolean $storeContent
* @param string $defaultEncoding HTML encoding, is used if it's not specified using Content-type HTTP-EQUIV meta tag.
* @return Zend_Search_Lucene_Document_Html
*/
public static function loadHTMLFile($file, $storeContent = false, $defaultEncoding = '')
{
return new Zend_Search_Lucene_Document_Html($file, true, $storeContent, $defaultEncoding);
}
/**
* Highlight text in text node
*
* @param DOMText $node
* @param array $wordsToHighlight
* @param callback $callback Callback method, used to transform (highlighting) text.
* @param array $params Array of additionall callback parameters (first non-optional parameter is a text to transform)
* @throws Zend_Search_Lucene_Exception
*/
protected function _highlightTextNode(DOMText $node, $wordsToHighlight, $callback, $params)
{
/** Zend_Search_Lucene_Analysis_Analyzer */
require_once 'Zend/Search/Lucene/Analysis/Analyzer.php';
$analyzer = Zend_Search_Lucene_Analysis_Analyzer::getDefault();
$analyzer->setInput($node->nodeValue, 'UTF-8');
$matchedTokens = array();
while (($token = $analyzer->nextToken()) !== null) {
if (isset($wordsToHighlight[$token->getTermText()])) {
$matchedTokens[] = $token;
}
}
if (count($matchedTokens) == 0) {
return;
}
$matchedTokens = array_reverse($matchedTokens);
foreach ($matchedTokens as $token) {
// Cut text after matched token
$node->splitText($token->getEndOffset());
// Cut matched node
$matchedWordNode = $node->splitText($token->getStartOffset());
// Retrieve HTML string representation for highlihted word
$fullCallbackparamsList = $params;
array_unshift($fullCallbackparamsList, $matchedWordNode->nodeValue);
$highlightedWordNodeSetHtml = call_user_func_array($callback, $fullCallbackparamsList);
// Transform HTML string to a DOM representation and automatically transform retrieved string
// into valid XHTML (It's automatically done by loadHTML() method)
$highlightedWordNodeSetDomDocument = new DOMDocument('1.0', 'UTF-8');
$success = @$highlightedWordNodeSetDomDocument->
loadHTML('<html><head><meta http-equiv="Content-type" content="text/html; charset=UTF-8"/></head><body>'
. $highlightedWordNodeSetHtml
. '</body></html>');
if (!$success) {
require_once 'Zend/Search/Lucene/Exception.php';
throw new Zend_Search_Lucene_Exception("Error occured while loading highlighted text fragment: '$highlightedNodeHtml'.");
}
$highlightedWordNodeSetXpath = new DOMXPath($highlightedWordNodeSetDomDocument);
$highlightedWordNodeSet = $highlightedWordNodeSetXpath->query('/html/body')->item(0)->childNodes;
for ($count = 0; $count < $highlightedWordNodeSet->length; $count++) {
$nodeToImport = $highlightedWordNodeSet->item($count);
$node->parentNode->insertBefore($this->_doc->importNode($nodeToImport, true /* deep copy */),
$matchedWordNode);
}
$node->parentNode->removeChild($matchedWordNode);
}
}
/**
* highlight words in content of the specified node
*
* @param DOMNode $contextNode
* @param array $wordsToHighlight
* @param callback $callback Callback method, used to transform (highlighting) text.
* @param array $params Array of additionall callback parameters (first non-optional parameter is a text to transform)
*/
protected function _highlightNodeRecursive(DOMNode $contextNode, $wordsToHighlight, $callback, $params)
{
$textNodes = array();
if (!$contextNode->hasChildNodes()) {
return;
}
foreach ($contextNode->childNodes as $childNode) {
if ($childNode->nodeType == XML_TEXT_NODE) {
// process node later to leave childNodes structure untouched
$textNodes[] = $childNode;
} else {
// Process node if it's not a script node
if ($childNode->nodeName != 'script') {
$this->_highlightNodeRecursive($childNode, $wordsToHighlight, $callback, $params);
}
}
}
foreach ($textNodes as $textNode) {
$this->_highlightTextNode($textNode, $wordsToHighlight, $callback, $params);
}
}
/**
* Standard callback method used to highlight words.
*
* @param string $stringToHighlight
* @return string
* @internal
*/
public function applyColour($stringToHighlight, $colour)
{
return '<b style="color:black;background-color:' . $colour . '">' . $stringToHighlight . '</b>';
}
/**
* Highlight text with specified color
*
* @param string|array $words
* @param string $colour
* @return string
*/
public function highlight($words, $colour = '#66ffff')
{
return $this->highlightExtended($words, array($this, 'applyColour'), array($colour));
}
/**
* Highlight text using specified View helper or callback function.
*
* @param string|array $words Words to highlight. Words could be organized using the array or string.
* @param callback $callback Callback method, used to transform (highlighting) text.
* @param array $params Array of additionall callback parameters passed through into it
* (first non-optional parameter is an HTML fragment for highlighting)
* @return string
* @throws Zend_Search_Lucene_Exception
*/
public function highlightExtended($words, $callback, $params = array())
{
/** Zend_Search_Lucene_Analysis_Analyzer */
require_once 'Zend/Search/Lucene/Analysis/Analyzer.php';
if (!is_array($words)) {
$words = array($words);
}
$wordsToHighlightList = array();
$analyzer = Zend_Search_Lucene_Analysis_Analyzer::getDefault();
foreach ($words as $wordString) {
$wordsToHighlightList[] = $analyzer->tokenize($wordString);
}
$wordsToHighlight = call_user_func_array('array_merge', $wordsToHighlightList);
if (count($wordsToHighlight) == 0) {
return $this->_doc->saveHTML();
}
$wordsToHighlightFlipped = array();
foreach ($wordsToHighlight as $id => $token) {
$wordsToHighlightFlipped[$token->getTermText()] = $id;
}
if (!is_callable($callback)) {
require_once 'Zend/Search/Lucene/Exception.php';
throw new Zend_Search_Lucene_Exception('$viewHelper parameter mast be a View Helper name, View Helper object or callback.');
}
$xpath = new DOMXPath($this->_doc);
$matchedNodes = $xpath->query("/html/body");
foreach ($matchedNodes as $matchedNode) {
$this->_highlightNodeRecursive($matchedNode, $wordsToHighlightFlipped, $callback, $params);
}
}
/**
* Get HTML
*
* @return string
*/
public function getHTML()
{
return $this->_doc->saveHTML();
}
/**
* Get HTML body
*
* @return string
*/
public function getHtmlBody()
{
$xpath = new DOMXPath($this->_doc);
$bodyNodes = $xpath->query('/html/body')->item(0)->childNodes;
$outputFragments = array();
for ($count = 0; $count < $bodyNodes->length; $count++) {
$outputFragments[] = $this->_doc->saveXML($bodyNodes->item($count));
}
return implode($outputFragments);
}
}
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