La clase DOMImplementation

(PHP 5)

Introducción

La interfaz DOMImplementation proporciona varios métodos para realizar operaciones que son independientes de cualquier instancia en particular del modelo de objetos del documento.

Sinopsis de la Clase

DOMImplementation {
/* Propiedades */
/* Métodos */
__construct ( void )
public DOMDocument createDocument ([ string $namespaceURI = NULL [, string $qualifiedName = NULL [, DOMDocumentType $doctype = NULL ]]] )
public DOMDocumentType createDocumentType ([ string $qualifiedName = NULL [, string $publicId = NULL [, string $systemId = NULL ]]] )
public bool hasFeature ( string $feature , string $version )
}

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User Contributed Notes 4 notes

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1
giorgio dot liscio at email dot it
4 years ago
officially, the w3 specifies that the way to access dom interfaces is through this class

so if you use

$doc = new DOMDocument("1.0", "UTF-8");

use instead:

$x = new DOMImplementation();
$doc = $x->createDocument(NULL,"rootElementName");
$doc->xmlVersion="1.0";
$doc->xmlEncoding="UTF-8";

it is not required by php's implementation, but, probably, it is a good practice

see:

http://w3.org/TR/DOM-Level-3-Core/core.html#DOMImplementation

http://w3.org/TR/DOM-Level-3-Core/core.html#DOMImplementationList

http://w3.org/TR/DOM-Level-3-Core/core.html#DOMImplementationSource
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0
LANGE.LUDO
21 days ago
Ok got it working like a charm using "proxy pattern" with traits. The idea being declaring the common methods inside a "trait" in order for extended and registered Node Classes to have access even if not derived / child of the extended DOMNode…

Here a small snippet :
<?php
   
namespace my;

    trait
tNode
   
{    // We need the magic method __get in order to add properties such as DOMNode->parentElement
       
public function __get($name)
        {    if(
property_exists($this, $name)){return $this->$name;}
            if(
method_exists($this, $name)){return $this->$name();}
            throw new \
ErrorException('my\\Node property \''.(string) $name.'\' not found…', 42, E_USER_WARNING);
        }

       
// parentElement property definition
       
private function parentElement()
        {    if(
$this->parentNode === null){return null;}
            if(
$this->parentNode->nodeType === XML_ELEMENT_NODE){return $this->parentNode;}
            return
$this->parentNode->parentElement();
        }

       
// JavaScript equivalent
       
public function isEqualNode(\DOMNode $node){return $this->isSameNode($node);}
        public function
compareDocumentPosition(\DOMNode $otherNode)
        {    if(
$this->ownerDocument !== $otherNode->ownerDocument){return DOCUMENT_POSITION_DISCONNECTED;}
           
$c = strcmp($this->getNodePath(), $otherNode->getNodePath());
            if(
$c === 0){return 0;}
            else if(
$c < 0){return DOCUMENT_POSITION_FOLLOWING | ($c < -1 ? DOCUMENT_POSITION_CONTAINED_BY : 0);}
            return
DOCUMENT_POSITION_PRECEDING | ($c > 1 ? DOCUMENT_POSITION_CONTAINS : 0);
        }
        public function
contains(\DOMNode $otherNode){return ($this->compareDocumentPosition($otherNode) >= DOCUMENT_POSITION_CONTAINED_BY);}
    }

    class
Document extends \DomDocument
   
{    public function __construct($version=null, $encoding=null)
        {   
parent::__construct($version, $encoding);
           
$this->registerNodeClass('DOMNode', 'my\Node');
           
$this->registerNodeClass('DOMElement', 'my\Element');
           
$this->registerNodeClass('DOMDocument', 'my\Document');
           
/* [...] */
       
}
    }

    class
Element extends \DOMElement
   
{    use tNode;
       
/* [...] */
   
}

    class
Node extends \DOMNode
   
{    use tNode;
       
/* [...] */
   
}

?>
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0
LANGE.LUDO
21 days ago
From what I've seen you must "recode" the "createDocument" method in order to call your own object extension…

<?php
[...]
    public function
createDocument($namespaceURI=null, $qualifiedName=null, DOMDocumentType $docType=null)
    {   
$doc=new Document();
       
$doc->appendChild(parent::createDocumentType('html'));
       
$this->doc->appendChild($namespaceURI ? $this->doc->createElementNS($namespaceURI,$qualifiedName) : $this->doc->createElement($qualifiedName));
    return
$doc;
    }
[...]
?>

Where I am struggling is extending the whole tree so that calling the customized Implementation method returns a whole extended tree…
Expected result : Implementation > Document > DOMDocument > Node > DOMNode
Actual result : Implementation > Document > DOMDocument > DOMNode :(
up
0
LANGE.LUDO
22 days ago
Why not use the DOMImplementation to directly register your DOM Class extensions ?

<?php
namespace My;
class
Implementation extends \DOMImplementation
{    private $doc;
    public function
__construct(){return $this->createDocument();}
    public function
__get($name){return $this->doc->{$name};}
    public function
__set($name,$value){$this->doc->{$name}=$value;}
    public function
__isset($name){return isset($this->doc->{$name});}
    public function
__unset($name){return $this->doc->__unset($name);}
    public function
__call($name,$args){return call_user_func_array(array($this->doc,$name),$args);}
   
    public function
createDocument($namespaceURI=null,$qualifiedName=null,DOMDocumentType $docType=null)
    {   
$this->doc=parent::createDocument($namespaceURI,$qualifiedName,$docType);
       
$this->doc->xmlVersion='1.0';
       
$this->doc->xmlEncoding='UTF-8';
       
$this->doc->registerNodeClass('DOMDocument','My\Document');
       
$this->doc->registerNodeClass('DOMDocumentFragment','My\DocumentFragment');
       
$this->doc->registerNodeClass('DOMElement','My\Element');
       
$this->doc->registerNodeClass('DOMComment','My\Comment');
       
$this->doc->registerNodeClass('DOMNode','My\Node');
       
/* …, …, … */
       
return $this->doc;
    }
}
?>
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