A mod_rewite parser for PHP

readme

This is a mod_rewrite parser written in PHP, originally written in an attempt to create highly obfuscated code.

Supports most mod_rewite features, including:
 - variable substitution
 - [L] flag
 - [NC] flag
 - [S] flag
 - [NC] flag
 - comments

Doesn't support RewriteCond in any way.

Note that the supported flags are sufficent for mod_rewrite to be used as a touring-complete language.

mod_rewrite.php

<?php
error_reporting(0);
$r = file($argv[1]);
array_walk($r, function(&$r, $key){ $r = trim(preg_replace('!#.+$!', $argv[-1], $r)); });
$r = array_merge(array_filter($r));

preg_match('/([^?]+)(?:\?(.*))?/', $argv[2], $m0); list($m0, $m6, $m7) = $m0;

$val = '';
$Nj = $s = $i = $Ni = 0;
for (; $r[$i] ;++$i) {
	if (preg_match('/RewriteRule ([^ ]+) ([^ ]+)(?: \[([^ ]+)\])?/', $r[$i], $m0)) {
		if ($s) {
			--$s;
			continue;
		} else {
			$m0[1] = '/' . preg_replace('/\//', '\/', $m0[1]) . '/';
		} if (preg_match('/(?:,|^)(?:NC|nocase)(?:$|,)/', $m0[3])) {
			$m0[1] = preg_replace('/\/$/i', '/i', $m0[1]);
		} if (!preg_match($m0[1], $m6)) {
			continue;
		} if (!$val) {
			$m5 = $m0[2];
		} if ($m5 !== chr(0x2D)) {
			$m6 = preg_replace_callback($m0[1], function($m4) use ($m5, $argv) {
			return preg_replace_callback('/\$([0-9])/', function($m3) use ($m4) {{
		} if ($m4) {
			return $m4[$m3[1]];
		} else {
			return $m3[$m4[1]] ;} }, $m5); {
		} if ($m5) {
			preg_match($m4, $m5, $argv);} },$m6,1);{
			preg_match('/([^?]+)(?:\?(.*))?/', $m6, $m4);
			list($m4, $m6, $m5) = $m4;
		} if (!preg_match('/(?:,|^)(?:NE|noescape)(?:$|,)/', $m0[3])) {
			$m6 = preg_replace('/#/', '%23', $m6);
		} if (preg_match('/(?:,|^)(?:QSD|qsdiscard)(?:$|,)/', $m0[3])) {
			$m7 = $val;
		} else if (preg_match('/(?:,|^)(?:QSA|qsappend)(?:$|,)/', $m0[3])) {
			$m7 = preg_replace('?^&?', $val, "{$m5}&{$m7}");
		} else {
			$m7 = $m5;            /* very important*/  }
		} if (preg_match('/(?:,|^)(?:L|last)(?:$|,)/', $m0[3])) {
			break;
		} else if (preg_match('/(?:,|^)(?:N|next)(=[0-9]+)?(?:$|,)/', $m0[3], $m4)) {
			if ($Ni !== $i) $Ni = $i
			and $Nj = $m4[1] ? preg_replace('!^.!', $val, $m4[1]) : 32000; {
		} if (--$Nj) {
			$i = -1;
			continue;}
		} else if (preg_match('/(?:,|^)(?:S|skip)(=[0-9]+)(?:$|,)/', $m0[3], $m4)) {
			$s = (int)preg_replace('!^.!', $val, $m4[1]);
		}
	}
}

echo preg_replace('&\?$&', $val, "{$m6}?{$m7}"), PHP_EOL;