1 | <?php |
||
2 | |||
3 | /** |
||
4 | * A zipper is a purely-functional data structure which contains |
||
5 | * a focus that can be efficiently manipulated. It is known as |
||
6 | * a "one-hole context". This mutable variant implements a zipper |
||
7 | * for a list as a pair of two arrays, laid out as follows: |
||
8 | * |
||
9 | * Base list: 1 2 3 4 [ ] 6 7 8 9 |
||
10 | * Front list: 1 2 3 4 |
||
11 | * Back list: 9 8 7 6 |
||
12 | * |
||
13 | * User is expected to keep track of the "current element" and properly |
||
14 | * fill it back in as necessary. (ToDo: Maybe it's more user friendly |
||
15 | * to implicitly track the current element?) |
||
16 | * |
||
17 | * Nota bene: the current class gets confused if you try to store NULLs |
||
18 | * in the list. |
||
19 | */ |
||
20 | |||
21 | class HTMLPurifier_Zipper |
||
22 | { |
||
23 | public $front, $back; |
||
24 | |||
25 | public function __construct($front, $back) { |
||
26 | $this->front = $front; |
||
27 | $this->back = $back; |
||
28 | } |
||
29 | |||
30 | /** |
||
31 | * Creates a zipper from an array, with a hole in the |
||
32 | * 0-index position. |
||
33 | * @param Array to zipper-ify. |
||
34 | * @return Tuple of zipper and element of first position. |
||
35 | */ |
||
36 | static public function fromArray($array) { |
||
37 | $z = new self(array(), array_reverse($array)); |
||
38 | $t = $z->delete(); // delete the "dummy hole" |
||
39 | return array($z, $t); |
||
40 | } |
||
41 | |||
42 | /** |
||
43 | * Convert zipper back into a normal array, optionally filling in |
||
44 | * the hole with a value. (Usually you should supply a $t, unless you |
||
45 | * are at the end of the array.) |
||
46 | */ |
||
47 | public function toArray($t = NULL) { |
||
48 | $a = $this->front; |
||
49 | if ($t !== NULL) $a[] = $t; |
||
50 | for ($i = count($this->back)-1; $i >= 0; $i--) { |
||
51 | $a[] = $this->back[$i]; |
||
52 | } |
||
53 | return $a; |
||
54 | } |
||
55 | |||
56 | /** |
||
57 | * Move hole to the next element. |
||
58 | * @param $t Element to fill hole with |
||
59 | * @return Original contents of new hole. |
||
60 | */ |
||
61 | public function next($t) { |
||
62 | if ($t !== NULL) array_push($this->front, $t); |
||
63 | return empty($this->back) ? NULL : array_pop($this->back); |
||
64 | } |
||
65 | |||
66 | /** |
||
67 | * Iterated hole advancement. |
||
68 | * @param $t Element to fill hole with |
||
69 | * @param $i How many forward to advance hole |
||
70 | * @return Original contents of new hole, i away |
||
71 | */ |
||
72 | public function advance($t, $n) { |
||
73 | for ($i = 0; $i < $n; $i++) { |
||
74 | $t = $this->next($t); |
||
75 | } |
||
76 | return $t; |
||
77 | } |
||
78 | |||
79 | /** |
||
80 | * Move hole to the previous element |
||
81 | * @param $t Element to fill hole with |
||
82 | * @return Original contents of new hole. |
||
83 | */ |
||
84 | public function prev($t) { |
||
85 | if ($t !== NULL) array_push($this->back, $t); |
||
86 | return empty($this->front) ? NULL : array_pop($this->front); |
||
87 | } |
||
88 | |||
89 | /** |
||
90 | * Delete contents of current hole, shifting hole to |
||
91 | * next element. |
||
92 | * @return Original contents of new hole. |
||
93 | */ |
||
94 | public function delete() { |
||
95 | return empty($this->back) ? NULL : array_pop($this->back); |
||
96 | } |
||
97 | |||
98 | /** |
||
99 | * Returns true if we are at the end of the list. |
||
100 | * @return bool |
||
101 | */ |
||
102 | public function done() { |
||
103 | return empty($this->back); |
||
104 | } |
||
105 | |||
106 | /** |
||
107 | * Insert element before hole. |
||
108 | * @param Element to insert |
||
109 | */ |
||
110 | public function insertBefore($t) { |
||
111 | if ($t !== NULL) array_push($this->front, $t); |
||
112 | } |
||
113 | |||
114 | /** |
||
115 | * Insert element after hole. |
||
116 | * @param Element to insert |
||
117 | */ |
||
118 | public function insertAfter($t) { |
||
119 | if ($t !== NULL) array_push($this->back, $t); |
||
120 | } |
||
121 | |||
122 | /** |
||
123 | * Splice in multiple elements at hole. Functional specification |
||
124 | * in terms of array_splice: |
||
125 | * |
||
126 | * $arr1 = $arr; |
||
127 | * $old1 = array_splice($arr1, $i, $delete, $replacement); |
||
128 | * |
||
129 | * list($z, $t) = HTMLPurifier_Zipper::fromArray($arr); |
||
130 | * $t = $z->advance($t, $i); |
||
131 | * list($old2, $t) = $z->splice($t, $delete, $replacement); |
||
132 | * $arr2 = $z->toArray($t); |
||
133 | * |
||
134 | * assert($old1 === $old2); |
||
135 | * assert($arr1 === $arr2); |
||
136 | * |
||
137 | * NB: the absolute index location after this operation is |
||
138 | * *unchanged!* |
||
139 | * |
||
140 | * @param Current contents of hole. |
||
0 ignored issues
–
show
|
|||
141 | */ |
||
142 | public function splice($t, $delete, $replacement) { |
||
143 | // delete |
||
144 | $old = array(); |
||
145 | $r = $t; |
||
146 | for ($i = $delete; $i > 0; $i--) { |
||
147 | $old[] = $r; |
||
148 | $r = $this->delete(); |
||
149 | } |
||
150 | // insert |
||
151 | for ($i = count($replacement)-1; $i >= 0; $i--) { |
||
152 | $this->insertAfter($r); |
||
153 | $r = $replacement[$i]; |
||
154 | } |
||
155 | return array($old, $r); |
||
156 | } |
||
157 | } |
||
158 |
The issue could also be caused by a filter entry in the build configuration. If the path has been excluded in your configuration, e.g.
excluded_paths: ["lib/*"]
, you can move it to the dependency path list as follows:For further information see https://scrutinizer-ci.com/docs/tools/php/php-scrutinizer/#list-dependency-paths