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PhutilRemarkupEngine.php
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Fri, Nov 29, 10:36

PhutilRemarkupEngine.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
*/
final class PhutilRemarkupEngine extends PhutilMarkupEngine {
private $blockRules = array();
private $config = array();
private $metadata = array();
public function setConfig($key, $value) {
$this->config[$key] = $value;
return $this;
}
public function getConfig($key, $default = null) {
return idx($this->config, $key, $default);
}
public function setBlockRules(array $rules) {
$this->blockRules = $rules;
return $this;
}
public function getTextMetadata($key, $default = null) {
return idx($this->metadata, $key, $default);
}
public function setTextMetadata($key, $value) {
$this->metadata[$key] = $value;
return $this;
}
public function storeText($text) {
return $this->storage->store($text);
}
public function overwriteStoredText($token, $new_text) {
$this->storage->overwrite($token, $new_text);
return $this;
}
public function markupText($text) {
return $this->postProcessText($this->preprocessText($text));
}
private function setupProcessing() {
$this->metadata = array();
$this->storage = new PhutilRemarkupBlockStorage();
$block_rules = $this->blockRules;
if (empty($block_rules)) {
throw new Exception("Remarkup engine not configured with block rules.");
}
foreach ($block_rules as $rule) {
$rule->setEngine($this);
}
}
public function preprocessText($text) {
$this->setupProcessing();
// Apply basic block and paragraph normalization to the text.
$text = preg_replace("/\r\n?/", "\n", $text);
$text = preg_replace("/[ \t]*$/m", '', $text);
$text = preg_split("/\n\n/", $text);
$block_rules = $this->blockRules;
$blocks = array();
$last = null;
foreach ($text as $block) {
$match = false;
foreach ($block_rules as $key => $block_rule) {
if (!$block_rule->shouldMatchBlock(trim($block, "\n"))) {
continue;
}
if (($last !== null) &&
($key == $last) &&
$block_rule->shouldMergeBlocks()) {
end($blocks);
$last_block_key = key($blocks);
$blocks[$last_block_key]['block'] .= "\n\n".$block;
} else {
$blocks[] = array(
'rule' => $block_rule,
'block' => $block,
);
}
$last = $key;
$match = true;
break;
}
if (!$match) {
throw new Exception("Block in text did not match any block rule.");
}
}
$output = array();
foreach ($blocks as $block) {
$output[] = $block['rule']->markupText($block['block']);
}
$map = $this->storage->getMap();
unset($this->storage);
$metadata = $this->metadata;
return array(
'output' => implode("\n\n", $output),
'storage' => $map,
'metadata' => $metadata,
);
}
public function postprocessText(array $dict) {
$this->setupProcessing();
$this->metadata = idx($dict, 'metadata', array());
$this->storage->setMap(idx($dict, 'storage', array()));
foreach ($this->blockRules as $block_rule) {
$block_rule->postprocess();
}
return $this->storage->restore(idx($dict, 'output'));
}
}

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