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PhutilLanguageGuesser.php
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Sun, Aug 25, 11:28

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 $patterns = array(
// Capture "#!/usr/bin/env php" sorts of things.
'@^#!.*bin/env\s+(\S+)@' => 1,
// Capture "#!/usr/bin/php" sorts of things.
'@^#!.*bin/(\S+)@' => 1,
// Capture initial "<?php", which means PHP.
'@^\s*<[?](php)@' => 1,
// Capture emacs "mode" header.
'@^.*-[*]-.*mode\s*:\s*(\S+).*-[*]-.*$@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;
}
}

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