PhutilLanguageGuesser.php
10a688376d24production

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;
			}

			}