HTMLPurifier/EntityParser.php Quellcode

EntityParser.php
gehe zur Dokumentation dieser Datei
1 <?php
2 
3 // if want to implement error collecting here, we'll need to use some sort
4 // of global data (probably trigger_error) because it's impossible to pass
5 // $config or $context to the callback functions.
6 
11 {
12 
17  protected $_entity_lookup;
18 
24  '/&(?:[#]x([a-fA-F0-9]+)|[#]0*(\d+)|([A-Za-z_:][A-Za-z0-9.\-_:]*));?/';
25  // 1. hex 2. dec 3. string (XML style)
26 
31  protected $_special_dec2str =
32  array(
33  34 => '"',
34  38 => '&',
35  39 => "'",
36  60 => '<',
37  62 => '>'
38  );
39 
44  protected $_special_ent2dec =
45  array(
46  'quot' => 34,
47  'amp' => 38,
48  'lt' => 60,
49  'gt' => 62
50  );
51 
60  public function substituteNonSpecialEntities($string)
61  {
62  // it will try to detect missing semicolons, but don't rely on it
63  return preg_replace_callback(
64  $this->_substituteEntitiesRegex,
65  array($this, 'nonSpecialEntityCallback'),
66  $string
67  );
68  }
69 
79  protected function nonSpecialEntityCallback($matches)
80  {
81  // replaces all but big five
82  $entity = $matches[0];
83  $is_num = (@$matches[0][1] === '#');
84  if ($is_num) {
85  $is_hex = (@$entity[2] === 'x');
86  $code = $is_hex ? hexdec($matches[1]) : (int) $matches[2];
87  // abort for special characters
88  if (isset($this->_special_dec2str[$code])) {
89  return $entity;
90  }
91  return HTMLPurifier_Encoder::unichr($code);
92  } else {
93  if (isset($this->_special_ent2dec[$matches[3]])) {
94  return $entity;
95  }
96  if (!$this->_entity_lookup) {
97  $this->_entity_lookup = HTMLPurifier_EntityLookup::instance();
98  }
99  if (isset($this->_entity_lookup->table[$matches[3]])) {
100  return $this->_entity_lookup->table[$matches[3]];
101  } else {
102  return $entity;
103  }
104  }
105  }
106 
116  public function substituteSpecialEntities($string)
117  {
118  return preg_replace_callback(
119  $this->_substituteEntitiesRegex,
120  array($this, 'specialEntityCallback'),
121  $string
122  );
123  }
124 
135  protected function specialEntityCallback($matches)
136  {
137  $entity = $matches[0];
138  $is_num = (@$matches[0][1] === '#');
139  if ($is_num) {
140  $is_hex = (@$entity[2] === 'x');
141  $int = $is_hex ? hexdec($matches[1]) : (int) $matches[2];
142  return isset($this->_special_dec2str[$int]) ?
143  $this->_special_dec2str[$int] :
144  $entity;
145  } else {
146  return isset($this->_special_ent2dec[$matches[3]]) ?
147  $this->_special_ent2dec[$matches[3]] :
148  $entity;
149  }
150  }
151 }
152 
153 // vim: et sw=4 sts=4




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