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<?php
/*
* This file is part of Psy Shell.
*
* (c) 2012-2018 Justin Hileman
*
* For the full copyright and license information, please view the LICENSE
* file that was distributed with this source code.
*/
namespace Psy\Input;
use Psy\Exception\ErrorException;
use Psy\Exception\RuntimeException;
use Symfony\Component\Console\Input\InputInterface;
use Symfony\Component\Console\Input\InputOption;
/**
* Parse, validate and match --grep, --insensitive and --invert command options.
*/
class FilterOptions
{
private $filter = false;
private $pattern;
private $insensitive;
private $invert;
/**
* Get input option definitions for filtering.
*
* @return InputOption[]
*/
public static function getOptions()
{
return [
new InputOption('grep', 'G', InputOption::VALUE_REQUIRED, 'Limit to items matching the given pattern (string or regex).'),
new InputOption('insensitive', 'i', InputOption::VALUE_NONE, 'Case-insensitive search (requires --grep).'),
new InputOption('invert', 'v', InputOption::VALUE_NONE, 'Inverted search (requires --grep).'),
];
}
/**
* Bind input and prepare filter.
*
* @param InputInterface $input
*/
public function bind(InputInterface $input)
{
$this->validateInput($input);
if (!$pattern = $input->getOption('grep')) {
$this->filter = false;
return;
}
if (!$this->stringIsRegex($pattern)) {
$pattern = '/' . \preg_quote($pattern, '/') . '/';
}
if ($insensitive = $input->getOption('insensitive')) {
$pattern .= 'i';
}
$this->validateRegex($pattern);
$this->filter = true;
$this->pattern = $pattern;
$this->insensitive = $insensitive;
$this->invert = $input->getOption('invert');
}
/**
* Check whether the bound input has filter options.
*
* @return bool
*/
public function hasFilter()
{
return $this->filter;
}
/**
* Check whether a string matches the current filter options.
*
* @param string $string
* @param array $matches
*
* @return bool
*/
public function match($string, array &$matches = null)
{
return $this->filter === false || (\preg_match($this->pattern, $string, $matches) xor $this->invert);
}
/**
* Validate that grep, invert and insensitive input options are consistent.
*
* @param InputInterface $input
*
* @return bool
*/
private function validateInput(InputInterface $input)
{
if (!$input->getOption('grep')) {
foreach (['invert', 'insensitive'] as $option) {
if ($input->getOption($option)) {
throw new RuntimeException('--' . $option . ' does not make sense without --grep');
}
}
}
}
/**
* Check whether a string appears to be a regular expression.
*
* @param string $string
*
* @return bool
*/
private function stringIsRegex($string)
{
return \substr($string, 0, 1) === '/' && \substr($string, -1) === '/' && \strlen($string) >= 3;
}
/**
* Validate that $pattern is a valid regular expression.
*
* @param string $pattern
*
* @return bool
*/
private function validateRegex($pattern)
{
\set_error_handler(['Psy\Exception\ErrorException', 'throwException']);
try {
\preg_match($pattern, '');
} catch (ErrorException $e) {
\restore_error_handler();
throw new RuntimeException(\str_replace('preg_match(): ', 'Invalid regular expression: ', $e->getRawMessage()));
}
\restore_error_handler();
}
}