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PhutilRemarkupBlockStorage.php
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Fri, Mar 21, 16:14

PhutilRemarkupBlockStorage.php
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<?php
/*
* Copyright 2011 Facebook, Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
/**
* Remarkup prevents several classes of text-processing problems by replacing
* tokens in the text as they are marked up. For example, if you write something
* like this:
*
* //D12//
*
* It is processed in several stages. First the "D12" matches and is replaced:
*
* //~1%//
*
* Now the italics match and are replaced:
*
* ~2%
*
* When processing completes, all the tokens are replaced again in reverse
* order:
*
* <em>~1%</em>
*
* Then:
*
* <em><a href="http://...">...</a></em>
*
* If we didn't do this, the italics rule could match the "//" in "http://",
* or any other number of processing mistakes could occur, some of which create
* security risks.
*
* This class generates keys, and stores the map of keys to replacement text.
*
* @group markup
*/
final class PhutilRemarkupBlockStorage {
private $map = array();
private $index;
public function store($text) {
$key = "~".(++$this->index)."%";
$this->map[$key] = $text;
return $key;
}
public function restore($corpus) {
if ($this->map) {
$corpus = str_replace(
array_reverse(array_keys($this->map)),
array_reverse($this->map),
$corpus);
$this->map = array();
}
return $corpus;
}
public function overwrite($key, $new_text) {
$this->map[$key] = $new_text;
return $this;
}
public function getMap() {
return $this->map;
}
public function setMap(array $map) {
$this->map = $map;
return $this;
}
}

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