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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 | ||
41 | /** | |
42 | * Validates the value of background-position. | |
43 | */ | |
44 | class HTMLPurifier_AttrDef_CSS_BackgroundPosition extends HTMLPurifier_AttrDef | |
45 | { | |
46 | ||
47 | protected $length; | |
48 | protected $percentage; | |
49 | ||
50 | public function __construct() { | |
51 | $this->length = new HTMLPurifier_AttrDef_CSS_Length(); | |
52 | $this->percentage = new HTMLPurifier_AttrDef_CSS_Percentage(); | |
53 | } | |
54 | ||
55 | public function validate($string, $config, $context) { | |
56 | $string = $this->parseCDATA($string); | |
57 | $bits = explode(' ', $string); | |
58 | ||
59 | $keywords = array(); | |
60 | $keywords['h'] = false; // left, right | |
61 | $keywords['v'] = false; // top, bottom | |
62 | $keywords['ch'] = false; // center (first word) | |
63 | $keywords['cv'] = false; // center (second word) | |
64 | $measures = array(); | |
65 | ||
66 | $i = 0; | |
67 | ||
68 | $lookup = array( | |
69 | 'top' => 'v', | |
70 | 'bottom' => 'v', | |
71 | 'left' => 'h', | |
72 | 'right' => 'h', | |
73 | 'center' => 'c' | |
74 | ); | |
75 | ||
76 | foreach ($bits as $bit) { | |
77 | if ($bit === '') continue; | |
78 | ||
79 | // test for keyword | |
80 | $lbit = ctype_lower($bit) ? $bit : strtolower($bit); | |
81 | if (isset($lookup[$lbit])) { | |
82 | $status = $lookup[$lbit]; | |
83 | if ($status == 'c') { | |
84 | if ($i == 0) { | |
85 | $status = 'ch'; | |
86 | } else { | |
87 | $status = 'cv'; | |
88 | } | |
89 | } | |
90 | $keywords[$status] = $lbit; | |
91 | $i++; | |
92 | } | |
93 | ||
94 | // test for length | |
95 | $r = $this->length->validate($bit, $config, $context); | |
96 | if ($r !== false) { | |
97 | $measures[] = $r; | |
98 | $i++; | |
99 | } | |
100 | ||
101 | // test for percentage | |
102 | $r = $this->percentage->validate($bit, $config, $context); | |
103 | if ($r !== false) { | |
104 | $measures[] = $r; | |
105 | $i++; | |
106 | } | |
107 | ||
108 | } | |
109 | ||
110 | if (!$i) return false; // no valid values were caught | |
111 | ||
112 | $ret = array(); | |
113 | ||
114 | // first keyword | |
115 | if ($keywords['h']) $ret[] = $keywords['h']; | |
116 | elseif ($keywords['ch']) { | |
117 | $ret[] = $keywords['ch']; | |
118 | $keywords['cv'] = false; // prevent re-use: center = center center | |
119 | } | |
120 | elseif (count($measures)) $ret[] = array_shift($measures); | |
121 | ||
122 | if ($keywords['v']) $ret[] = $keywords['v']; | |
123 | elseif ($keywords['cv']) $ret[] = $keywords['cv']; | |
124 | elseif (count($measures)) $ret[] = array_shift($measures); | |
125 | ||
126 | if (empty($ret)) return false; | |
127 | return implode(' ', $ret); | |
128 | ||
129 | } | |
130 | ||
131 | } | |
132 | ||
133 | // vim: et sw=4 sts=4 |