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phorge/src/infrastructure/markup/remarkup/markuprule/imagemacro/PhabricatorRemarkupRuleImageMacro.php
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PhabricatorRemarkupRuleImageMacro.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.
*/
/**
* @group markup
*/
class PhabricatorRemarkupRuleImageMacro
extends PhutilRemarkupRule {
const RANDOM_IMAGE_NAME = 'randomon';
private $images = array();
private $hash = 0;
public function __construct() {
$rows = id(new PhabricatorFileImageMacro())->loadAll();
foreach ($rows as $row) {
$this->images[$row->getName()] = $row->getFilePHID();
}
$this->images[self::RANDOM_IMAGE_NAME] = '';
}
public function apply($text) {
$this->hash = 0;
return preg_replace_callback(
'@\b([a-zA-Z0-9_\-]+)\b@U',
array($this, 'markupImageMacro'),
$text);
}
/**
* Silly function for generating some 'randomness' based on the
* words in the text
*/
private function updateHash($word) {
// Simple Jenkins hash
for ($ii = 0; $ii < strlen($word); $ii++) {
$this->hash += ord($word[$ii]);
$this->hash += ($this->hash << 10);
$this->hash ^= ($this->hash >> 6);
}
}
public function markupImageMacro($matches) {
// Update the hash that is used for defining each 'randomon' image. This way
// each 'randomon' image will be different, but they won't change when the
// text is updated.
$this->updateHash($matches[1]);
if (array_key_exists($matches[1], $this->images)) {
if ($matches[1] === self::RANDOM_IMAGE_NAME) {
$keys = array_keys($this->images);
$phid = $this->images[$keys[$this->hash % count($this->images)]];
} else {
$phid = $this->images[$matches[1]];
}
$img = phutil_render_tag(
'img',
array(
'src' => PhabricatorFileURI::getViewURIForPHID($phid),
'alt' => $matches[1],
'title' => $matches[1]),
null);
return $this->getEngine()->storeText($img);
} else {
return $matches[1];
}
}
}

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