Replace existing autoloader with Composer-supplied

- Move Friendica namespace to `src`
- Move required `ezyang/htmlpurifier` to vendor
- Remove existing static autoloader
- Change boot.php reference to the autoloader

vendor/ezyang/htmlpurifier/library/HTMLPurifier/ContentSets.php

@@ -0,0 +1,170 @@
+<?php
+
+/**
+ * @todo Unit test
+ */
+class HTMLPurifier_ContentSets
+{
+
+    /**
+     * List of content set strings (pipe separators) indexed by name.
+     * @type array
+     */
+    public $info = array();
+
+    /**
+     * List of content set lookups (element => true) indexed by name.
+     * @type array
+     * @note This is in HTMLPurifier_HTMLDefinition->info_content_sets
+     */
+    public $lookup = array();
+
+    /**
+     * Synchronized list of defined content sets (keys of info).
+     * @type array
+     */
+    protected $keys = array();
+    /**
+     * Synchronized list of defined content values (values of info).
+     * @type array
+     */
+    protected $values = array();
+
+    /**
+     * Merges in module's content sets, expands identifiers in the content
+     * sets and populates the keys, values and lookup member variables.
+     * @param HTMLPurifier_HTMLModule[] $modules List of HTMLPurifier_HTMLModule
+     */
+    public function __construct($modules)
+    {
+        if (!is_array($modules)) {
+            $modules = array($modules);
+        }
+        // populate content_sets based on module hints
+        // sorry, no way of overloading
+        foreach ($modules as $module) {
+            foreach ($module->content_sets as $key => $value) {
+                $temp = $this->convertToLookup($value);
+                if (isset($this->lookup[$key])) {
+                    // add it into the existing content set
+                    $this->lookup[$key] = array_merge($this->lookup[$key], $temp);
+                } else {
+                    $this->lookup[$key] = $temp;
+                }
+            }
+        }
+        $old_lookup = false;
+        while ($old_lookup !== $this->lookup) {
+            $old_lookup = $this->lookup;
+            foreach ($this->lookup as $i => $set) {
+                $add = array();
+                foreach ($set as $element => $x) {
+                    if (isset($this->lookup[$element])) {
+                        $add += $this->lookup[$element];
+                        unset($this->lookup[$i][$element]);
+                    }
+                }
+                $this->lookup[$i] += $add;
+            }
+        }
+
+        foreach ($this->lookup as $key => $lookup) {
+            $this->info[$key] = implode(' | ', array_keys($lookup));
+        }
+        $this->keys   = array_keys($this->info);
+        $this->values = array_values($this->info);
+    }
+
+    /**
+     * Accepts a definition; generates and assigns a ChildDef for it
+     * @param HTMLPurifier_ElementDef $def HTMLPurifier_ElementDef reference
+     * @param HTMLPurifier_HTMLModule $module Module that defined the ElementDef
+     */
+    public function generateChildDef(&$def, $module)
+    {
+        if (!empty($def->child)) { // already done!
+            return;
+        }
+        $content_model = $def->content_model;
+        if (is_string($content_model)) {
+            // Assume that $this->keys is alphanumeric
+            $def->content_model = preg_replace_callback(
+                '/\b(' . implode('|', $this->keys) . ')\b/',
+                array($this, 'generateChildDefCallback'),
+                $content_model
+            );
+            //$def->content_model = str_replace(
+            //    $this->keys, $this->values, $content_model);
+        }
+        $def->child = $this->getChildDef($def, $module);
+    }
+
+    public function generateChildDefCallback($matches)
+    {
+        return $this->info[$matches[0]];
+    }
+
+    /**
+     * Instantiates a ChildDef based on content_model and content_model_type
+     * member variables in HTMLPurifier_ElementDef
+     * @note This will also defer to modules for custom HTMLPurifier_ChildDef
+     *       subclasses that need content set expansion
+     * @param HTMLPurifier_ElementDef $def HTMLPurifier_ElementDef to have ChildDef extracted
+     * @param HTMLPurifier_HTMLModule $module Module that defined the ElementDef
+     * @return HTMLPurifier_ChildDef corresponding to ElementDef
+     */
+    public function getChildDef($def, $module)
+    {
+        $value = $def->content_model;
+        if (is_object($value)) {
+            trigger_error(
+                'Literal object child definitions should be stored in '.
+                'ElementDef->child not ElementDef->content_model',
+                E_USER_NOTICE
+            );
+            return $value;
+        }
+        switch ($def->content_model_type) {
+            case 'required':
+                return new HTMLPurifier_ChildDef_Required($value);
+            case 'optional':
+                return new HTMLPurifier_ChildDef_Optional($value);
+            case 'empty':
+                return new HTMLPurifier_ChildDef_Empty();
+            case 'custom':
+                return new HTMLPurifier_ChildDef_Custom($value);
+        }
+        // defer to its module
+        $return = false;
+        if ($module->defines_child_def) { // save a func call
+            $return = $module->getChildDef($def);
+        }
+        if ($return !== false) {
+            return $return;
+        }
+        // error-out
+        trigger_error(
+            'Could not determine which ChildDef class to instantiate',
+            E_USER_ERROR
+        );
+        return false;
+    }
+
+    /**
+     * Converts a string list of elements separated by pipes into
+     * a lookup array.
+     * @param string $string List of elements
+     * @return array Lookup array of elements
+     */
+    protected function convertToLookup($string)
+    {
+        $array = explode('|', str_replace(' ', '', $string));
+        $ret = array();
+        foreach ($array as $k) {
+            $ret[$k] = true;
+        }
+        return $ret;
+    }
+}
+
+// vim: et sw=4 sts=4