PhutilLanguageGuesser.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.
	*/

	/**
	* Very simple class to guess the languages of source files which we failed to
	* determine by examining file name/extension rules.
	*
	* @group util
	*/
	final class PhutilLanguageGuesser {

	/**
	* Guess which computer programming language a file is written in.
	*
	* @param string Source text of the file.
	* @return mixed Language string, or null if unable to guess.
	*/
	public static function guessLanguage($source) {
	static $patterns = array(
	// Capture "#!/usr/bin/env php" sorts of things.
	'@^#!.*bin/env\s+(\S+)@',
	// Capture "#!/usr/bin/php" sorts of things.
	'@^#!.*bin/(\S+)@',
	// Capture initial "<?php", which means PHP.
	'@^\s*<[?](php)@',
	// Capture emacs "mode" header.
	'@^.-[]-.mode\s:\s(\S+).-[]-.$@m',
	// Capture a magic word.
	'@(rainbow)@',
	);

	foreach ($patterns as $pattern) {
	$matches = null;
	if (preg_match($pattern, $source, $matches)) {
	return $matches[1];
	}
	}

	return null;
	}

	}