<?php

/*
 * This file is part of the Symfony package.
 *
 * (c) Fabien Potencier <fabien@symfony.com>
 *
 * For the full copyright and license information, please view the LICENSE
 * file that was distributed with this source code.
 */

namespace Symfony\Component\Finder\Iterator;

/**
 * MultiplePcreFilterIterator filters files using patterns (regexps, globs or strings).
 *
 * @author Fabien Potencier <fabien@symfony.com>
 */
abstract class MultiplePcreFilterIterator extends \FilterIterator
{
    protected $matchRegexps = [];
    protected $noMatchRegexps = [];

    /**
     * @param \Iterator $iterator        The Iterator to filter
     * @param string[]  $matchPatterns   An array of patterns that need to match
     * @param string[]  $noMatchPatterns An array of patterns that need to not match
     */
    public function __construct(\Iterator $iterator, array $matchPatterns, array $noMatchPatterns)
    {
        foreach ($matchPatterns as $pattern) {
            $this->matchRegexps[] = $this->toRegex($pattern);
        }

        foreach ($noMatchPatterns as $pattern) {
            $this->noMatchRegexps[] = $this->toRegex($pattern);
        }

        parent::__construct($iterator);
    }

    /**
     * Checks whether the string is accepted by the regex filters.
     *
     * If there is no regexps defined in the class, this method will accept the string.
     * Such case can be handled by child classes before calling the method if they want to
     * apply a different behavior.
     *
     * @return bool
     */
    protected function isAccepted(string $string)
    {
        // should at least not match one rule to exclude
        foreach ($this->noMatchRegexps as $regex) {
            if (preg_match($regex, $string)) {
                return false;
            }
        }

        // should at least match one rule
        if ($this->matchRegexps) {
            foreach ($this->matchRegexps as $regex) {
                if (preg_match($regex, $string)) {
                    return true;
                }
            }

            return false;
        }

        // If there is no match rules, the file is accepted
        return true;
    }

    /**
     * Checks whether the string is a regex.
     *
     * @return bool
     */
    protected function isRegex(string $str)
    {
        if (preg_match('/^(.{3,}?)[imsxuADU]*$/', $str, $m)) {
            $start = substr($m[1], 0, 1);
            $end = substr($m[1], -1);

            if ($start === $end) {
                return !preg_match('/[*?[:alnum:] \\\\]/', $start);
            }

            foreach ([['{', '}'], ['(', ')'], ['[', ']'], ['<', '>']] as $delimiters) {
                if ($start === $delimiters[0] && $end === $delimiters[1]) {
                    return true;
                }
            }
        }

        return false;
    }

    /**
     * Converts string into regexp.
     *
     * @return string
     */
    abstract protected function toRegex(string $str);
}
