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www/vhosts/oinversion.com/httpdocs/vendor/ezyang/htmlpurifier/library/HTMLPurifier/HTMLModule.php000064400000023637151700654610030114 0ustar00var<?php

/**
 * Represents an XHTML 1.1 module, with information on elements, tags
 * and attributes.
 * @note Even though this is technically XHTML 1.1, it is also used for
 *       regular HTML parsing. We are using modulization as a convenient
 *       way to represent the internals of HTMLDefinition, and our
 *       implementation is by no means conforming and does not directly
 *       use the normative DTDs or XML schemas.
 * @note The public variables in a module should almost directly
 *       correspond to the variables in HTMLPurifier_HTMLDefinition.
 *       However, the prefix info carries no special meaning in these
 *       objects (include it anyway if that's the correspondence though).
 * @todo Consider making some member functions protected
 */

class HTMLPurifier_HTMLModule
{

    // -- Overloadable ----------------------------------------------------

    /**
     * Short unique string identifier of the module.
     * @type string
     */
    public $name;

    /**
     * Informally, a list of elements this module changes.
     * Not used in any significant way.
     * @type array
     */
    public $elements = array();

    /**
     * Associative array of element names to element definitions.
     * Some definitions may be incomplete, to be merged in later
     * with the full definition.
     * @type array
     */
    public $info = array();

    /**
     * Associative array of content set names to content set additions.
     * This is commonly used to, say, add an A element to the Inline
     * content set. This corresponds to an internal variable $content_sets
     * and NOT info_content_sets member variable of HTMLDefinition.
     * @type array
     */
    public $content_sets = array();

    /**
     * Associative array of attribute collection names to attribute
     * collection additions. More rarely used for adding attributes to
     * the global collections. Example is the StyleAttribute module adding
     * the style attribute to the Core. Corresponds to HTMLDefinition's
     * attr_collections->info, since the object's data is only info,
     * with extra behavior associated with it.
     * @type array
     */
    public $attr_collections = array();

    /**
     * Associative array of deprecated tag name to HTMLPurifier_TagTransform.
     * @type array
     */
    public $info_tag_transform = array();

    /**
     * List of HTMLPurifier_AttrTransform to be performed before validation.
     * @type array
     */
    public $info_attr_transform_pre = array();

    /**
     * List of HTMLPurifier_AttrTransform to be performed after validation.
     * @type array
     */
    public $info_attr_transform_post = array();

    /**
     * List of HTMLPurifier_Injector to be performed during well-formedness fixing.
     * An injector will only be invoked if all of it's pre-requisites are met;
     * if an injector fails setup, there will be no error; it will simply be
     * silently disabled.
     * @type array
     */
    public $info_injector = array();

    /**
     * Boolean flag that indicates whether or not getChildDef is implemented.
     * For optimization reasons: may save a call to a function. Be sure
     * to set it if you do implement getChildDef(), otherwise it will have
     * no effect!
     * @type bool
     */
    public $defines_child_def = false;

    /**
     * Boolean flag whether or not this module is safe. If it is not safe, all
     * of its members are unsafe. Modules are safe by default (this might be
     * slightly dangerous, but it doesn't make much sense to force HTML Purifier,
     * which is based off of safe HTML, to explicitly say, "This is safe," even
     * though there are modules which are "unsafe")
     *
     * @type bool
     * @note Previously, safety could be applied at an element level granularity.
     *       We've removed this ability, so in order to add "unsafe" elements
     *       or attributes, a dedicated module with this property set to false
     *       must be used.
     */
    public $safe = true;

    /**
     * Retrieves a proper HTMLPurifier_ChildDef subclass based on
     * content_model and content_model_type member variables of
     * the HTMLPurifier_ElementDef class. There is a similar function
     * in HTMLPurifier_HTMLDefinition.
     * @param HTMLPurifier_ElementDef $def
     * @return HTMLPurifier_ChildDef subclass
     */
    public function getChildDef($def)
    {
        return false;
    }

    // -- Convenience -----------------------------------------------------

    /**
     * Convenience function that sets up a new element
     * @param string $element Name of element to add
     * @param string|bool $type What content set should element be registered to?
     *              Set as false to skip this step.
     * @param string $contents Allowed children in form of:
     *              "$content_model_type: $content_model"
     * @param array $attr_includes What attribute collections to register to
     *              element?
     * @param array $attr What unique attributes does the element define?
     * @see HTMLPurifier_ElementDef:: for in-depth descriptions of these parameters.
     * @return HTMLPurifier_ElementDef Created element definition object, so you
     *         can set advanced parameters
     */
    public function addElement($element, $type, $contents, $attr_includes = array(), $attr = array())
    {
        $this->elements[] = $element;
        // parse content_model
        list($content_model_type, $content_model) = $this->parseContents($contents);
        // merge in attribute inclusions
        $this->mergeInAttrIncludes($attr, $attr_includes);
        // add element to content sets
        if ($type) {
            $this->addElementToContentSet($element, $type);
        }
        // create element
        $this->info[$element] = HTMLPurifier_ElementDef::create(
            $content_model,
            $content_model_type,
            $attr
        );
        // literal object $contents means direct child manipulation
        if (!is_string($contents)) {
            $this->info[$element]->child = $contents;
        }
        return $this->info[$element];
    }

    /**
     * Convenience function that creates a totally blank, non-standalone
     * element.
     * @param string $element Name of element to create
     * @return HTMLPurifier_ElementDef Created element
     */
    public function addBlankElement($element)
    {
        if (!isset($this->info[$element])) {
            $this->elements[] = $element;
            $this->info[$element] = new HTMLPurifier_ElementDef();
            $this->info[$element]->standalone = false;
        } else {
            trigger_error("Definition for $element already exists in module, cannot redefine");
        }
        return $this->info[$element];
    }

    /**
     * Convenience function that registers an element to a content set
     * @param string $element Element to register
     * @param string $type Name content set (warning: case sensitive, usually upper-case
     *        first letter)
     */
    public function addElementToContentSet($element, $type)
    {
        if (!isset($this->content_sets[$type])) {
            $this->content_sets[$type] = '';
        } else {
            $this->content_sets[$type] .= ' | ';
        }
        $this->content_sets[$type] .= $element;
    }

    /**
     * Convenience function that transforms single-string contents
     * into separate content model and content model type
     * @param string $contents Allowed children in form of:
     *                  "$content_model_type: $content_model"
     * @return array
     * @note If contents is an object, an array of two nulls will be
     *       returned, and the callee needs to take the original $contents
     *       and use it directly.
     */
    public function parseContents($contents)
    {
        if (!is_string($contents)) {
            return array(null, null);
        } // defer
        switch ($contents) {
            // check for shorthand content model forms
            case 'Empty':
                return array('empty', '');
            case 'Inline':
                return array('optional', 'Inline | #PCDATA');
            case 'Flow':
                return array('optional', 'Flow | #PCDATA');
        }
        list($content_model_type, $content_model) = explode(':', $contents);
        $content_model_type = strtolower(trim($content_model_type));
        $content_model = trim($content_model);
        return array($content_model_type, $content_model);
    }

    /**
     * Convenience function that merges a list of attribute includes into
     * an attribute array.
     * @param array $attr Reference to attr array to modify
     * @param array $attr_includes Array of includes / string include to merge in
     */
    public function mergeInAttrIncludes(&$attr, $attr_includes)
    {
        if (!is_array($attr_includes)) {
            if (empty($attr_includes)) {
                $attr_includes = array();
            } else {
                $attr_includes = array($attr_includes);
            }
        }
        $attr[0] = $attr_includes;
    }

    /**
     * Convenience function that generates a lookup table with boolean
     * true as value.
     * @param string $list List of values to turn into a lookup
     * @note You can also pass an arbitrary number of arguments in
     *       place of the regular argument
     * @return array array equivalent of list
     */
    public function makeLookup($list)
    {
        if (is_string($list)) {
            $list = func_get_args();
        }
        $ret = array();
        foreach ($list as $value) {
            if (is_null($value)) {
                continue;
            }
            $ret[$value] = true;
        }
        return $ret;
    }

    /**
     * Lazy load construction of the module after determining whether
     * or not it's needed, and also when a finalized configuration object
     * is available.
     * @param HTMLPurifier_Config $config
     */
    public function setup($config)
    {
    }
}

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