PhutilLanguageGuesser.php
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	<?php

	/**
	* 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 $patterns = array(
	// Capture "#!/usr/bin/env php" sorts of things.
	'@^#!.*bin/env\s+(\S+)@' => 1,
	// Capture "#!/usr/bin/php" sorts of things.
	'@^#!.*bin/(\S+)@' => 1,
	// Capture initial "<?php", which means PHP.
	'@^\s*<[?](php)@' => 1,
	// Capture emacs "mode" header.
	'@^.-[]-.mode\s:\s(\S+).-[]-.$@m' => 1,
	// Look for things that seem to be diffs.
	'/^---.$\n^[+]{3}.$\n^@@/m' => 'diff',
	'/^diff --git/' => 'diff',
	// Look for plausible console output.
	'@^(?:\S+[\\\\/] )?[$] @' => 'console',
	);

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

	return null;
	}

	}