1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
|
<?php
namespace andreskrey\Readability;
use andreskrey\Readability\NodeClass\DOMDocument;
use andreskrey\Readability\NodeClass\DOMElement;
use andreskrey\Readability\NodeClass\DOMNode;
/**
* Class NodeUtility
* @package andreskrey\Readability
*/
class NodeUtility
{
/**
* @var array
*/
private static $divToPElements = [
'a',
'blockquote',
'dl',
'div',
'img',
'ol',
'p',
'pre',
'table',
'ul',
'select',
];
/**
*
* Imported from the Element class on league\html-to-markdown
*
* @param $node
* @return mixed
*/
public static function nextElement($node)
{
$next = $node;
while ($next
&& $next->nodeName !== '#text'
&& trim($next->textContent)) {
$next = $next->nextSibling;
}
return $next;
}
/**
* Changes the node tag name. Since tagName on DOMElement is a read only value, this must be done creating a new
* element with the new tag name and importing it to the main DOMDocument.
*
* @param string $value
* @param bool $importAttributes
* @return DOMNode
*/
public static function setNodeTag($node, $value, $importAttributes = false)
{
$new = new DOMDocument('1.0', 'utf-8');
$new->appendChild($new->createElement($value));
$children = $node->childNodes;
/** @var $children \DOMNodeList $i */
for ($i = 0; $i < $children->length; $i++) {
$import = $new->importNode($children->item($i), true);
$new->firstChild->appendChild($import);
}
if ($importAttributes) {
// Import attributes from the original node.
foreach ($node->attributes as $attribute) {
$new->firstChild->setAttribute($attribute->nodeName, $attribute->nodeValue);
}
}
// The import must be done on the firstChild of $new, since $new is a DOMDocument and not a DOMElement.
$import = $node->ownerDocument->importNode($new->firstChild, true);
$node->parentNode->replaceChild($import, $node);
return $import;
}
/**
* Removes the current node and returns the next node to be parsed (child, sibling or parent).
*
* @param DOMNode $node
*
* @return DOMNode
*/
public static function removeAndGetNext($node)
{
$nextNode = self::getNextNode($node, true);
$node->parentNode->removeChild($node);
return $nextNode;
}
/**
* Remove the passed node.
*
* @param DOMElement $node
*
* @return void
**/
public static function removeNode(DOMElement $node)
{
$parent = $node->parentNode;
if ($parent) {
$parent->removeChild($node);
}
}
/**
* Returns the next node. First checks for childs (if the flag allows it), then for siblings, and finally
* for parents.
*
* @param DOMNode $originalNode
* @param bool $ignoreSelfAndKids
*
* @return DOMNode
*/
public static function getNextNode($originalNode, $ignoreSelfAndKids = false)
{
/*
* Traverse the DOM from node to node, starting at the node passed in.
* Pass true for the second parameter to indicate this node itself
* (and its kids) are going away, and we want the next node over.
*
* Calling this in a loop will traverse the DOM depth-first.
*/
// First check for kids if those aren't being ignored
if (!$ignoreSelfAndKids && $originalNode->firstChild) {
return $originalNode->firstChild;
}
// Then for siblings...
if ($originalNode->nextSibling) {
return $originalNode->nextSibling;
}
// And finally, move up the parent chain *and* find a sibling
// (because this is depth-first traversal, we will have already
// seen the parent nodes themselves).
do {
$originalNode = $originalNode->parentNode;
} while ($originalNode && !$originalNode->nextSibling);
return ($originalNode) ? $originalNode->nextSibling : $originalNode;
}
/**
* Checks if the current node has a single child and if that child is a P node.
* Useful to convert <div><p> nodes to a single <p> node and avoid confusing the scoring system since div with p
* tags are, in practice, paragraphs.
*
* @param DOMNode $node
*
* @return bool
*/
public static function hasSinglePNode($node)
{
// There should be exactly 1 element child which is a P:
if (count($children = $node->getChildren(true)) !== 1 || $children[0]->nodeName !== 'p') {
return false;
}
// And there should be no text nodes with real content (param true on ->getChildren)
foreach ($children as $child) {
/** @var $child DOMNode */
if ($child->nodeType === XML_TEXT_NODE && !preg_match('/\S$/', $child->getTextContent())) {
return false;
}
}
return true;
}
/**
* @param $node DOMNode
* @return bool
*/
public static function hasSingleChildBlockElement($node)
{
$result = false;
if ($node->hasChildNodes()) {
foreach ($node->getChildren() as $child) {
if (in_array($child->nodeName, self::$divToPElements)) {
$result = true;
} else {
// If any of the hasSingleChildBlockElement calls return true, return true then.
$result = ($result || self::hasSingleChildBlockElement($child));
}
}
}
return $result;
}
/**
* Returns the full text of the node.
*
* @param $node DOMNode|DOMElement
* @param bool $normalize Normalize white space?
* @return string
*/
public static function getTextContent($node, $normalize = false)
{
$nodeValue = $node->nodeValue;
if ($normalize) {
$nodeValue = trim(preg_replace('/\s{2,}/', ' ', $nodeValue));
}
return $nodeValue;
}
}
|
