<?php
/**
* Very simple class to guess the languages of source files which we failed to
* determine by examining file name/extension rules.
*/
final class PhutilLanguageGuesser extends Phobject {
/**
* 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;
}
}