From 6854cb3f4d8219cf1829e32122eb2502a916eae9 Mon Sep 17 00:00:00 2001
From: Andreas Baumann <mail@andreasbaumann.cc>
Date: Sat, 1 Feb 2020 09:05:48 +0100
Subject: initial checkin

---
 .../library/HTMLPurifier/ChildDef/Custom.php       | 102 +++++++++++++++++++++
 1 file changed, 102 insertions(+)
 create mode 100644 vendor/ezyang/htmlpurifier/library/HTMLPurifier/ChildDef/Custom.php

(limited to 'vendor/ezyang/htmlpurifier/library/HTMLPurifier/ChildDef/Custom.php')

diff --git a/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ChildDef/Custom.php b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ChildDef/Custom.php
new file mode 100644
index 0000000..128132e
--- /dev/null
+++ b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/ChildDef/Custom.php
@@ -0,0 +1,102 @@
+<?php
+
+/**
+ * Custom validation class, accepts DTD child definitions
+ *
+ * @warning Currently this class is an all or nothing proposition, that is,
+ *          it will only give a bool return value.
+ */
+class HTMLPurifier_ChildDef_Custom extends HTMLPurifier_ChildDef
+{
+    /**
+     * @type string
+     */
+    public $type = 'custom';
+
+    /**
+     * @type bool
+     */
+    public $allow_empty = false;
+
+    /**
+     * Allowed child pattern as defined by the DTD.
+     * @type string
+     */
+    public $dtd_regex;
+
+    /**
+     * PCRE regex derived from $dtd_regex.
+     * @type string
+     */
+    private $_pcre_regex;
+
+    /**
+     * @param $dtd_regex Allowed child pattern from the DTD
+     */
+    public function __construct($dtd_regex)
+    {
+        $this->dtd_regex = $dtd_regex;
+        $this->_compileRegex();
+    }
+
+    /**
+     * Compiles the PCRE regex from a DTD regex ($dtd_regex to $_pcre_regex)
+     */
+    protected function _compileRegex()
+    {
+        $raw = str_replace(' ', '', $this->dtd_regex);
+        if ($raw{0} != '(') {
+            $raw = "($raw)";
+        }
+        $el = '[#a-zA-Z0-9_.-]+';
+        $reg = $raw;
+
+        // COMPLICATED! AND MIGHT BE BUGGY! I HAVE NO CLUE WHAT I'M
+        // DOING! Seriously: if there's problems, please report them.
+
+        // collect all elements into the $elements array
+        preg_match_all("/$el/", $reg, $matches);
+        foreach ($matches[0] as $match) {
+            $this->elements[$match] = true;
+        }
+
+        // setup all elements as parentheticals with leading commas
+        $reg = preg_replace("/$el/", '(,\\0)', $reg);
+
+        // remove commas when they were not solicited
+        $reg = preg_replace("/([^,(|]\(+),/", '\\1', $reg);
+
+        // remove all non-paranthetical commas: they are handled by first regex
+        $reg = preg_replace("/,\(/", '(', $reg);
+
+        $this->_pcre_regex = $reg;
+    }
+
+    /**
+     * @param HTMLPurifier_Node[] $children
+     * @param HTMLPurifier_Config $config
+     * @param HTMLPurifier_Context $context
+     * @return bool
+     */
+    public function validateChildren($children, $config, $context)
+    {
+        $list_of_children = '';
+        $nesting = 0; // depth into the nest
+        foreach ($children as $node) {
+            if (!empty($node->is_whitespace)) {
+                continue;
+            }
+            $list_of_children .= $node->name . ',';
+        }
+        // add leading comma to deal with stray comma declarations
+        $list_of_children = ',' . rtrim($list_of_children, ',');
+        $okay =
+            preg_match(
+                '/^,?' . $this->_pcre_regex . '$/',
+                $list_of_children
+            );
+        return (bool)$okay;
+    }
+}
+
+// vim: et sw=4 sts=4
-- 
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