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PhutilXHPASTSyntaxHighlighter.php
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Fri, Apr 4, 20:33

PhutilXHPASTSyntaxHighlighter.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 PhutilXHPASTSyntaxHighlighter {
private $config = array();
public function setConfig($key, $value) {
$this->config[$key] = $value;
return $this;
}
public function getHighlightFuture($source) {
try {
$result = $this->applyXHPHighlight($source);
return new ImmediateFuture($result);
} catch (Exception $ex) {
if (!empty($this->config['pygments.enabled'])) {
// Fall back to Pygments if we failed to highlight using XHP. The XHP
// highlighter currently uses a parser, not just a lexer, so it fails on
// snippets which aren't valid syntactically.
return id(new PhutilPygmentsSyntaxHighlighter())
->setConfig('language', 'php')
->getHighlightFuture($source);
} else {
return id(new PhutilDefaultSyntaxHighlighter())
->getHighlightFuture($source);
}
}
}
private function applyXHPHighlight($source) {
$scrub = false;
if (strpos($source, '<?') === false) {
$source = "<?php\n".$source."\n";
$scrub = true;
}
$tree = XHPASTTree::newFromData($source);
$out = array();
$next = null;
foreach ($tree->getRootNode()->getTokens() as $token) {
$value = phutil_escape_html($token->getValue());
$class = null;
$multi = false;
switch ($token->getTypeName()) {
case 'T_WHITESPACE':
break;
case 'T_DOC_COMMENT':
$class = 'dc';
$multi = true;
break;
case 'T_COMMENT':
$class = 'c';
$multi = true;
break;
case 'T_CONSTANT_ENCAPSED_STRING':
case 'T_ENCAPSED_AND_WHITESPACE':
case 'T_INLINE_HTML':
$class = 's';
$multi = true;
break;
case 'T_VARIABLE':
$class = 'nv';
break;
case 'T_OPEN_TAG':
case 'T_OPEN_TAG_WITH_ECHO':
case 'T_CLOSE_TAG':
$class = 'o';
break;
case 'T_OBJECT_OPERATOR':
$next = 'na';
$class = 'k';
break;
case 'T_LNUMBER':
case 'T_DNUMBER':
$class = 'm';
break;
case 'T_STRING':
static $magic = array(
'true' => true,
'false' => true,
'null' => true,
);
if (isset($magic[$value])) {
$class = 'k';
break;
}
if ($next) {
$class = $next;
$next = null;
} else {
$class = 'nx';
}
break;
default:
$class = 'k';
break;
}
if ($class) {
$value = '<span class="'.$class.'">'.$value.'</span>';
if ($multi) {
$value = str_replace(
"\n",
"</span>\n<span=\"{$class}\">",
$value);
}
$out[] = $value;
} else {
$out[] = $value;
}
}
if ($scrub) {
array_shift($out);
}
return rtrim(implode('', $out));
}
}

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