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/**
* @license Copyright (c) 2003-2021, CKSource - Frederico Knabben. All rights reserved.
* For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license
*/
/**
* @module engine/dataprocessor/dataprocessor
*/
/**
* The data processor interface. It should be implemented by actual data processors.
*
* Each data processor implements a certain format of the data. For example, {@glink features/markdown Markdown data processor}
* will convert the data (a Markdown string) to a {@link module:engine/view/documentfragment~DocumentFragment document fragment} and back.
*
* **Note:** While the CKEditor 5 architecture supports changing the data format, in most scenarios we do recommend sticking to
* the default format which is HTML (supported by the {@link module:engine/dataprocessor/htmldataprocessor~HtmlDataProcessor}).
* HTML remains [the best standard for rich-text data](https://medium.com/content-uneditable/a-standard-for-rich-text-data-4b3a507af552).
*
* And please do remember – using Markdown [does not automatically make your
* application/website secure](https://github.com/ckeditor/ckeditor5-markdown-gfm/issues/16#issuecomment-375752994).
*
* @interface DataProcessor
*/
/**
* Converts a {@link module:engine/view/documentfragment~DocumentFragment document fragment} to data.
*
* @method #toData
* @param {module:engine/view/documentfragment~DocumentFragment} fragment The document fragment to be processed.
* @returns {*}
*/
/**
* Converts the data to a {@link module:engine/view/documentfragment~DocumentFragment document fragment}.
*
* @method #toView
* @param {*} data The data to be processed.
* @returns {module:engine/view/documentfragment~DocumentFragment}
*/
/**
* Registers a {@link module:engine/view/matcher~MatcherPattern} for view elements whose content should be treated as raw data
* and its content should be converted to a
* {@link module:engine/view/element~Element#getCustomProperty custom property of a view element} called `"$rawContent"` while
* converting {@link #toView to view}.
*
* @method #registerRawContentMatcher
* @param {module:engine/view/matcher~MatcherPattern} pattern Pattern matching all view elements whose content should
* be treated as plain text.
*/
/**
* If the processor is set to use marked fillers, it will insert ` ` fillers wrapped in `<span>` elements
* (`<span data-cke-filler="true"> </span>`) instead of regular ` ` characters.
*
* This mode allows for more precise handling of block fillers (so they do not leak into the editor content) but bloats the
* editor data with additional markup.
*
* This mode may be required by some features and will be turned on by them automatically.
*
* @method #useFillerType
* @param {'default'|'marked'} type Whether to use the default or marked ` ` block fillers.
*/