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libphutil/src/markup/syntax/highlighter/PhutilDivinerSyntaxHighlighter.php
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PhutilDivinerSyntaxHighlighter.php
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<?php
/*
* Copyright 2012 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.
*/
/**
* Simple syntax highlighter for the ".diviner" format, which is just Remarkup
* with a specific ruleset. This should also work alright for Remarkup.
*
* @group markup
*/
final class PhutilDivinerSyntaxHighlighter {
private $config = array();
private $replaceClass;
public function setConfig($key, $value) {
$this->config[$key] = $value;
return $this;
}
public function getHighlightFuture($source) {
$source = phutil_escape_html($source);
// This highlighter isn't perfect but tries to do an okay job at getting
// some of the basics at least. There's lots of room for improvement.
// Highlight "@{class:...}" links to other documentation pages.
$source = $this->highlightPattern('/@{([\w@]+?):([^}]+?)}/', $source, 'nc');
// Highlight "@title", "@group", etc.
$source = $this->highlightPattern('/^@(\w+)/m', $source, 'k');
// Highlight bold, italic and monospace.
$source = $this->highlightPattern('@\\*\\*(.+?)\\*\\*@s', $source, 's');
$source = $this->highlightPattern('@(?<!:)//(.+?)//@s', $source, 's');
$source = $this->highlightPattern(
'@##([\s\S]+?)##|\B`(.+?)`\B@',
$source,
's');
// Highlight stuff that looks like headers.
$source = $this->highlightPattern('/^=(.*)$/m', $source, 'nv');
return new ImmediateFuture($source);
}
private function highlightPattern($regexp, $source, $class) {
$this->replaceClass = $class;
$source = preg_replace_callback(
$regexp,
array($this, 'replacePattern'),
$source);
return $source;
}
public function replacePattern($matches) {
// NOTE: The goal here is to make sure a <span> never crosses a newline.
$content = $matches[0];
$content = explode("\n", $content);
foreach ($content as $key => $line) {
$content[$key] =
'<span class="'.$this->replaceClass.'">'.
$line.
'</span>';
}
return implode("\n", $content);
}
}
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