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[github/wallabag/wallabag.git] / inc / JSLikeHTMLElement.php
1 <?php
2 /**
3 * JavaScript-like HTML DOM Element
4 *
5 * This class extends PHP's DOMElement to allow
6 * users to get and set the innerHTML property of
7 * HTML elements in the same way it's done in
8 * JavaScript.
9 *
10 * Example usage:
11 * @code
12 * require_once 'JSLikeHTMLElement.php';
13 * header('Content-Type: text/plain');
14 * $doc = new DOMDocument();
15 * $doc->registerNodeClass('DOMElement', 'JSLikeHTMLElement');
16 * $doc->loadHTML('<div><p>Para 1</p><p>Para 2</p></div>');
17 * $elem = $doc->getElementsByTagName('div')->item(0);
18 *
19 * // print innerHTML
20 * echo $elem->innerHTML; // prints '<p>Para 1</p><p>Para 2</p>'
21 * echo "\n\n";
22 *
23 * // set innerHTML
24 * $elem->innerHTML = '<a href="http://fivefilters.org">FiveFilters.org</a>';
25 * echo $elem->innerHTML; // prints '<a href="http://fivefilters.org">FiveFilters.org</a>'
26 * echo "\n\n";
27 *
28 * // print document (with our changes)
29 * echo $doc->saveXML();
30 * @endcode
31 *
32 * @author Keyvan Minoukadeh - http://www.keyvan.net - keyvan@keyvan.net
33 * @see http://fivefilters.org (the project this was written for)
34 */
35 class JSLikeHTMLElement extends DOMElement
36 {
37 /**
38 * Used for setting innerHTML like it's done in JavaScript:
39 * @code
40 * $div->innerHTML = '<h2>Chapter 2</h2><p>The story begins...</p>';
41 * @endcode
42 */
43 public function __set($name, $value) {
44 if ($name == 'innerHTML') {
45 // first, empty the element
46 for ($x=$this->childNodes->length-1; $x>=0; $x--) {
47 $this->removeChild($this->childNodes->item($x));
48 }
49 // $value holds our new inner HTML
50 if ($value != '') {
51 $f = $this->ownerDocument->createDocumentFragment();
52 // appendXML() expects well-formed markup (XHTML)
53 $result = @$f->appendXML($value); // @ to suppress PHP warnings
54 if ($result) {
55 if ($f->hasChildNodes()) $this->appendChild($f);
56 } else {
57 // $value is probably ill-formed
58 $f = new DOMDocument();
59 $value = mb_convert_encoding($value, 'HTML-ENTITIES', 'UTF-8');
60 // Using <htmlfragment> will generate a warning, but so will bad HTML
61 // (and by this point, bad HTML is what we've got).
62 // We use it (and suppress the warning) because an HTML fragment will
63 // be wrapped around <html><body> tags which we don't really want to keep.
64 // Note: despite the warning, if loadHTML succeeds it will return true.
65 $result = @$f->loadHTML('<htmlfragment>'.$value.'</htmlfragment>');
66 if ($result) {
67 $import = $f->getElementsByTagName('htmlfragment')->item(0);
68 foreach ($import->childNodes as $child) {
69 $importedNode = $this->ownerDocument->importNode($child, true);
70 $this->appendChild($importedNode);
71 }
72 } else {
73 // oh well, we tried, we really did. :(
74 // this element is now empty
75 }
76 }
77 }
78 } else {
79 $trace = debug_backtrace();
80 trigger_error('Undefined property via __set(): '.$name.' in '.$trace[0]['file'].' on line '.$trace[0]['line'], E_USER_NOTICE);
81 }
82 }
83
84 /**
85 * Used for getting innerHTML like it's done in JavaScript:
86 * @code
87 * $string = $div->innerHTML;
88 * @endcode
89 */
90 public function __get($name)
91 {
92 if ($name == 'innerHTML') {
93 $inner = '';
94 foreach ($this->childNodes as $child) {
95 $inner .= $this->ownerDocument->saveXML($child);
96 }
97 return $inner;
98 }
99
100 $trace = debug_backtrace();
101 trigger_error('Undefined property via __get(): '.$name.' in '.$trace[0]['file'].' on line '.$trace[0]['line'], E_USER_NOTICE);
102 return null;
103 }
104
105 public function __toString()
106 {
107 return '['.$this->tagName.']';
108 }
109 }
110 ?>