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1 | <?php |
2 | /** |
3 | * This program is free software; you can redistribute it and/or modify |
4 | * it under the terms of the GNU General Public License as published by |
5 | * the Free Software Foundation; either version 2 of the License, or |
6 | * (at your option) any later version. |
7 | * |
8 | * This program is distributed in the hope that it will be useful, |
9 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
10 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
11 | * GNU General Public License for more details. |
12 | * |
13 | * You should have received a copy of the GNU General Public License along |
14 | * with this program; if not, write to the Free Software Foundation, Inc., |
15 | * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. |
16 | * http://www.gnu.org/copyleft/gpl.html |
17 | * |
18 | * @file |
19 | */ |
20 | |
21 | /** |
22 | * An iterator which works exactly like: |
23 | * |
24 | * foreach ( explode( $delim, $s ) as $element ) { |
25 | * ... |
26 | * } |
27 | * |
28 | * Except it doesn't use 193 byte per element |
29 | */ |
30 | class ExplodeIterator implements Iterator { |
31 | /** @var string */ |
32 | private $subject; |
33 | |
34 | /** @var int */ |
35 | private $subjectLength; |
36 | |
37 | /** @var string */ |
38 | private $delim; |
39 | |
40 | /** @var int */ |
41 | private $delimLength; |
42 | |
43 | /** @var int|false The position of the start of the line */ |
44 | private $curPos; |
45 | |
46 | /** @var int|false The position after the end of the next delimiter */ |
47 | private $endPos; |
48 | |
49 | /** @var string|false The current token */ |
50 | private $current; |
51 | |
52 | /** |
53 | * Construct a DelimIterator |
54 | * @param string $delim |
55 | * @param string $subject |
56 | */ |
57 | public function __construct( $delim, $subject ) { |
58 | $this->subject = $subject; |
59 | $this->delim = $delim; |
60 | |
61 | // Micro-optimisation (theoretical) |
62 | $this->subjectLength = strlen( $subject ); |
63 | $this->delimLength = strlen( $delim ); |
64 | |
65 | $this->rewind(); |
66 | } |
67 | |
68 | public function rewind(): void { |
69 | $this->curPos = 0; |
70 | $this->endPos = strpos( $this->subject, $this->delim ); |
71 | $this->refreshCurrent(); |
72 | } |
73 | |
74 | public function refreshCurrent() { |
75 | if ( $this->curPos === false ) { |
76 | $this->current = false; |
77 | } elseif ( $this->curPos >= $this->subjectLength ) { |
78 | $this->current = ''; |
79 | } elseif ( $this->endPos === false ) { |
80 | $this->current = substr( $this->subject, $this->curPos ); |
81 | } else { |
82 | $this->current = substr( $this->subject, $this->curPos, $this->endPos - $this->curPos ); |
83 | } |
84 | } |
85 | |
86 | /** |
87 | * @return string|false |
88 | */ |
89 | #[\ReturnTypeWillChange] |
90 | public function current() { |
91 | return $this->current; |
92 | } |
93 | |
94 | /** |
95 | * @return int|false Current position or boolean false if invalid |
96 | */ |
97 | #[\ReturnTypeWillChange] |
98 | public function key() { |
99 | return $this->curPos; |
100 | } |
101 | |
102 | /** |
103 | * @return void |
104 | */ |
105 | public function next(): void { |
106 | if ( $this->endPos === false ) { |
107 | $this->curPos = false; |
108 | } else { |
109 | $this->curPos = $this->endPos + $this->delimLength; |
110 | if ( $this->curPos >= $this->subjectLength ) { |
111 | $this->endPos = false; |
112 | } else { |
113 | $this->endPos = strpos( $this->subject, $this->delim, $this->curPos ); |
114 | } |
115 | } |
116 | $this->refreshCurrent(); |
117 | } |
118 | |
119 | /** |
120 | * @return bool |
121 | */ |
122 | public function valid(): bool { |
123 | return $this->curPos !== false; |
124 | } |
125 | } |