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Mini Shell
Mini Shell
<?php
namespace Dotenv\Regex;
use Dotenv\Result\Error;
use Dotenv\Result\Result;
use Dotenv\Result\Success;
use PhpOption\Option;
class Regex
{
/**
* Perform a preg match, wrapping up the result.
*
* @param string $pattern
* @param string $subject
*
* @return \Dotenv\Result\Result<int,string>
*/
public static function match($pattern, $subject)
{
return self::pregAndWrap(function ($subject) use ($pattern) {
return (int) @preg_match($pattern, $subject);
}, $subject);
}
/**
* Perform a preg replace, wrapping up the result.
*
* @param string $pattern
* @param string $replacement
* @param string $subject
* @param int|null $limit
*
* @return \Dotenv\Result\Result<string,string>
*/
public static function replace($pattern, $replacement, $subject, $limit = null)
{
return self::pregAndWrap(function ($subject) use ($pattern, $replacement, $limit) {
return (string) @preg_replace($pattern, $replacement, $subject, $limit === null ? -1 : $limit);
}, $subject);
}
/**
* Perform a preg replace callback, wrapping up the result.
*
* @param string $pattern
* @param callable $callback
* @param string $subject
* @param int|null $limit
*
* @return \Dotenv\Result\Result<string,string>
*/
public static function replaceCallback($pattern, callable $callback, $subject, $limit = null)
{
return self::pregAndWrap(function ($subject) use ($pattern, $callback, $limit) {
return (string) @preg_replace_callback($pattern, $callback, $subject, $limit === null ? -1 : $limit);
}, $subject);
}
/**
* Perform a preg split, wrapping up the result.
*
* @param string $pattern
* @param string $subject
*
* @return \Dotenv\Result\Result<string[],string>
*/
public static function split($pattern, $subject)
{
return self::pregAndWrap(function ($subject) use ($pattern) {
return (array) @preg_split($pattern, $subject);
}, $subject);
}
/**
* Perform a preg operation, wrapping up the result.
*
* @template V
*
* @param callable(string):V $operation
* @param string $subject
*
* @return \Dotenv\Result\Result<V,string>
*/
private static function pregAndWrap(callable $operation, $subject)
{
$result = $operation($subject);
if (($e = preg_last_error()) !== PREG_NO_ERROR) {
return Error::create(self::lookupError($e));
}
return Success::create($result);
}
/**
* Lookup the preg error code.
*
* @param int $code
*
* @return string
*/
private static function lookupError($code)
{
return Option::fromValue(get_defined_constants(true))
->filter(function (array $consts) {
return isset($consts['pcre']) && defined('ARRAY_FILTER_USE_KEY');
})
->map(function (array $consts) {
return array_filter($consts['pcre'], function ($msg) {
return substr($msg, -6) === '_ERROR';
}, ARRAY_FILTER_USE_KEY);
})
->flatMap(function (array $errors) use ($code) {
return Option::fromValue(
array_search($code, $errors, true)
);
})
->getOrElse('PREG_ERROR');
}
}
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