ILIAS  release_5-1 Revision 5.0.0-5477-g43f3e3fab5f
BackgroundPosition.php
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1<?php
2
3/* W3C says:
4 [ // adjective and number must be in correct order, even if
5 // you could switch them without introducing ambiguity.
6 // some browsers support that syntax
7 [
8 <percentage> | <length> | left | center | right
9 ]
10 [
11 <percentage> | <length> | top | center | bottom
12 ]?
13 ] |
14 [ // this signifies that the vertical and horizontal adjectives
15 // can be arbitrarily ordered, however, there can only be two,
16 // one of each, or none at all
17 [
18 left | center | right
19 ] ||
20 [
21 top | center | bottom
22 ]
23 ]
24 top, left = 0%
25 center, (none) = 50%
26 bottom, right = 100%
27*/
28
29/* QuirksMode says:
30 keyword + length/percentage must be ordered correctly, as per W3C
31
32 Internet Explorer and Opera, however, support arbitrary ordering. We
33 should fix it up.
34
35 Minor issue though, not strictly necessary.
36*/
37
38// control freaks may appreciate the ability to convert these to
39// percentages or something, but it's not necessary
40
45{
46
50 protected $length;
51
55 protected $percentage;
56
57 public function __construct()
58 {
59 $this->length = new HTMLPurifier_AttrDef_CSS_Length();
60 $this->percentage = new HTMLPurifier_AttrDef_CSS_Percentage();
61 }
62
69 public function validate($string, $config, $context)
70 {
71 $string = $this->parseCDATA($string);
72 $bits = explode(' ', $string);
73
74 $keywords = array();
75 $keywords['h'] = false; // left, right
76 $keywords['v'] = false; // top, bottom
77 $keywords['ch'] = false; // center (first word)
78 $keywords['cv'] = false; // center (second word)
79 $measures = array();
80
81 $i = 0;
82
83 $lookup = array(
84 'top' => 'v',
85 'bottom' => 'v',
86 'left' => 'h',
87 'right' => 'h',
88 'center' => 'c'
89 );
90
91 foreach ($bits as $bit) {
92 if ($bit === '') {
93 continue;
94 }
95
96 // test for keyword
97 $lbit = ctype_lower($bit) ? $bit : strtolower($bit);
98 if (isset($lookup[$lbit])) {
99 $status = $lookup[$lbit];
100 if ($status == 'c') {
101 if ($i == 0) {
102 $status = 'ch';
103 } else {
104 $status = 'cv';
105 }
106 }
107 $keywords[$status] = $lbit;
108 $i++;
109 }
110
111 // test for length
112 $r = $this->length->validate($bit, $config, $context);
113 if ($r !== false) {
114 $measures[] = $r;
115 $i++;
116 }
117
118 // test for percentage
119 $r = $this->percentage->validate($bit, $config, $context);
120 if ($r !== false) {
121 $measures[] = $r;
122 $i++;
123 }
124 }
125
126 if (!$i) {
127 return false;
128 } // no valid values were caught
129
130 $ret = array();
131
132 // first keyword
133 if ($keywords['h']) {
134 $ret[] = $keywords['h'];
135 } elseif ($keywords['ch']) {
136 $ret[] = $keywords['ch'];
137 $keywords['cv'] = false; // prevent re-use: center = center center
138 } elseif (count($measures)) {
139 $ret[] = array_shift($measures);
140 }
141
142 if ($keywords['v']) {
143 $ret[] = $keywords['v'];
144 } elseif ($keywords['cv']) {
145 $ret[] = $keywords['cv'];
146 } elseif (count($measures)) {
147 $ret[] = array_shift($measures);
148 }
149
150 if (empty($ret)) {
151 return false;
152 }
153 return implode(' ', $ret);
154 }
155}
156
157// vim: et sw=4 sts=4
Validates the value of background-position.
$length
@type HTMLPurifier_AttrDef_CSS_Length
$percentage
@type HTMLPurifier_AttrDef_CSS_Percentage
Represents a Length as defined by CSS.
Definition: Length.php:7
Validates a Percentage as defined by the CSS spec.
Definition: Percentage.php:7
Base class for all validating attribute definitions.
Definition: AttrDef.php:14
parseCDATA($string)
Convenience method that parses a string as if it were CDATA.
Definition: AttrDef.php:60
$r
Definition: example_031.php:79