%PDF-
%PDF-
Mini Shell
Mini Shell
<?php
/**
* @author Félix Girault <felix.girault@gmail.com>
* @license FreeBSD License (http://opensource.org/licenses/BSD-2-Clause)
*/
namespace Essence\Dom\Parser;
use Essence\Dom\Parser;
use Essence\Exception;
use Essence\Utility\Hash;
use DomDocument;
use DomNode;
/**
* Handles HTML related operations through DomDocument.
*
* @package Essence.Dom.Parser
*/
class Native implements Parser {
/**
* {@inheritDoc}
*/
public function extractAttributes( $html, array $options ) {
$Document = $this->_document( $html );
$options = Hash::normalize( $options, [ ]);
$data = [ ];
foreach ( $options as $name => $required ) {
$tags = $Document->getElementsByTagName( $name );
$required = Hash::normalize(( array )$required, '' );
$data[ $name ] = [ ];
foreach ( $tags as $Tag ) {
if ( $Tag->hasAttributes( )) {
$attributes = $this->_extractAttributesFromTag(
$Tag,
$required
);
if ( !empty( $attributes )) {
$data[ $name ][ ] = $attributes;
}
}
}
}
return $data;
}
/**
* Builds and returns a DomDocument from the given HTML source.
*
* @param string $html HTML source.
* @return DomDocument DomDocument.
*/
protected function _document( $html ) {
$reporting = error_reporting( 0 );
$html = $this->fixCharset( $html );
$Document = DomDocument::loadHTML( $html );
error_reporting( $reporting );
if ( !$Document ) {
throw new Exception( 'Unable to load HTML document.' );
}
return $Document;
}
/**
* If necessary, fixes the given HTML's charset to work with the current
* version of Libxml (used by DomDocument). Older versions of Libxml
* recognize only
*
* <META http-equiv="Content-Type" content="text/html; charset=UTF-8">
*
* from HTML4, and not the new HTML5 form:
*
* <meta charset="utf-8">
*
* with the result that parsed strings can have funny characters.
*
* @param string $html HTML source.
* @return string the fixed HTML
* @see "HTML5, character encodings and DOMDocument loadHTML and loadHTMLFile"
* http://www.glenscott.co.uk/blog/html5-character-encodings-and-domdocument-loadhtml-and-loadhtmlfile/
*/
protected function fixCharset( $html ) {
// The fix is from https://github.com/glenscott/dom-document-charset/blob/master/DOMDocumentCharset.php
if ( LIBXML_VERSION < 20800 && stripos($html, 'meta charset') !== false ) {
$html = preg_replace( '/<meta charset=["\']?([^"\']+)"/i',
'<meta http-equiv="Content-Type" content="text/html; charset=$1"',
$html );
}
return $html;
}
/**
* Extracts attributes from the given tag.
*
* @param DOMNode $Tag Tag to extract attributes from.
* @param array $required Required attributes.
* @return array Extracted attributes.
*/
protected function _extractAttributesFromTag( DOMNode $Tag, array $required ) {
$attributes = [ ];
foreach ( $Tag->attributes as $name => $Attribute ) {
if ( !empty( $required )) {
if ( isset( $required[ $name ])) {
$pattern = $required[ $name ];
if ( $pattern && !preg_match( $pattern, $Attribute->value )) {
return [ ];
}
} else {
continue;
}
}
$attributes[ $name ] = $Attribute->value;
}
$diff = array_diff_key( $required, $attributes );
return empty( $diff )
? $attributes
: [ ];
}
}
Zerion Mini Shell 1.0