mirror of
https://code.mensbeam.com/MensBeam/Arsse.git
synced 2024-12-22 21:22:40 +00:00
88 lines
3.1 KiB
PHP
88 lines
3.1 KiB
PHP
<?php
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/** @license MIT
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* Copyright 2017 J. King, Dustin Wilson et al.
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* See LICENSE and AUTHORS files for details */
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declare(strict_types=1);
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namespace JKingWeb\Arsse\Rule;
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abstract class Rule {
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public static function prep(string $pattern): string {
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if (preg_match_all("<`>", $pattern, $m, \PREG_OFFSET_CAPTURE)) {
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// where necessary escape our chosen delimiter (backtick) in reverse order
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foreach (array_reverse($m[0]) as [,$pos]) {
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// count the number of backslashes preceding the delimiter character
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$count = 0;
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$p = $pos;
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while ($p-- && $pattern[$p] === "\\" && ++$count);
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// if the number is even (including zero), add a backslash
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if ($count % 2 === 0) {
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$pattern = substr($pattern, 0, $pos)."\\".substr($pattern, $pos);
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}
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}
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}
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// add the delimiters and test the pattern
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$pattern = "`$pattern`u";
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if (@preg_match($pattern, "") === false) {
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throw new Exception("invalidPattern");
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}
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return $pattern;
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}
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public static function validate(string $pattern): bool {
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try {
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static::prep($pattern);
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} catch (Exception $e) {
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return false;
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}
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return true;
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}
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/** applies keep and block rules against the title and categories of an article
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*
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* Returns true if the article is to be kept, and false if it is to be suppressed
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*/
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public static function apply(string $keepRule, string $blockRule, string $title, array $categories = []): bool {
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// if neither rule is processed we should keep
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$keep = true;
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// add the title to the front of the category array
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array_unshift($categories, $title);
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// process the keep rule if it exists
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if (strlen($keepRule)) {
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try {
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$rule = static::prep($keepRule);
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} catch (Exception $e) {
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return true;
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}
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// if a keep rule is specified the default state is now not to keep
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$keep = false;
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foreach ($categories as $str) {
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if (is_string($str)) {
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if (preg_match($rule, $str)) {
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// keep if the keep-rule matches one of the strings
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$keep = true;
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break;
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}
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}
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}
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}
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// process the block rule if the keep rule was matched
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if ($keep && strlen($blockRule)) {
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try {
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$rule = static::prep($blockRule);
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} catch (Exception $e) {
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return true;
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}
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foreach ($categories as $str) {
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if (is_string($str)) {
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if (preg_match($rule, $str)) {
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// do not keep if the block-rule matches one of the strings
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$keep = false;
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break;
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}
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}
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}
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}
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return $keep;
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}
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}
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