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converters.js
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converters.js
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/**
* @license Copyright (c) 2003-2023, CKSource Holding sp. z o.o. All rights reserved.
* For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license
*/
/**
* @module code-block/converters
*/
import { getPropertyAssociation } from './utils';
/**
* A model-to-view (both editing and data) converter for the `codeBlock` element.
*
* Sample input:
*
* <codeBlock language="javascript">foo();<softBreak></softBreak>bar();</codeBlock>
*
* Sample output (editing):
*
* <pre data-language="JavaScript"><code class="language-javascript">foo();<br />bar();</code></pre>
*
* Sample output (data, see {@link module:code-block/converters~modelToDataViewSoftBreakInsertion}):
*
* <pre><code class="language-javascript">foo();\nbar();</code></pre>
*
* @param {module:engine/model/model~Model} model
* @param {Array.<module:code-block/codeblock~CodeBlockLanguageDefinition>} languageDefs The normalized language
* configuration passed to the feature.
* @param {Boolean} [useLabels=false] When `true`, the `<pre>` element will get a `data-language` attribute with a
* human–readable label of the language. Used only in the editing.
* @returns {Function} Returns a conversion callback.
*/
export function modelToViewCodeBlockInsertion( model, languageDefs, useLabels = false ) {
// Language CSS classes:
//
// {
// php: 'language-php',
// python: 'language-python',
// javascript: 'js',
// ...
// }
const languagesToClasses = getPropertyAssociation( languageDefs, 'language', 'class' );
// Language labels:
//
// {
// php: 'PHP',
// python: 'Python',
// javascript: 'JavaScript',
// ...
// }
const languagesToLabels = getPropertyAssociation( languageDefs, 'language', 'label' );
return ( evt, data, conversionApi ) => {
const { writer, mapper, consumable } = conversionApi;
if ( !consumable.consume( data.item, 'insert' ) ) {
return;
}
const codeBlockLanguage = data.item.getAttribute( 'language' );
const targetViewPosition = mapper.toViewPosition( model.createPositionBefore( data.item ) );
const preAttributes = {};
// Attributes added only in the editing view.
if ( useLabels ) {
preAttributes[ 'data-language' ] = languagesToLabels[ codeBlockLanguage ];
preAttributes.spellcheck = 'false';
}
const code = writer.createContainerElement( 'code', {
class: languagesToClasses[ codeBlockLanguage ] || null
} );
const pre = writer.createContainerElement( 'pre', preAttributes, code );
writer.insert( targetViewPosition, pre );
mapper.bindElements( data.item, code );
};
}
/**
* A model-to-data view converter for the new line (`softBreak`) separator.
*
* Sample input:
*
* <codeBlock ...>foo();<softBreak></softBreak>bar();</codeBlock>
*
* Sample output:
*
* <pre><code ...>foo();\nbar();</code></pre>
*
* @param {module:engine/model/model~Model} model
* @returns {Function} Returns a conversion callback.
*/
export function modelToDataViewSoftBreakInsertion( model ) {
return ( evt, data, conversionApi ) => {
if ( data.item.parent.name !== 'codeBlock' ) {
return;
}
const { writer, mapper, consumable } = conversionApi;
if ( !consumable.consume( data.item, 'insert' ) ) {
return;
}
const position = mapper.toViewPosition( model.createPositionBefore( data.item ) );
writer.insert( position, writer.createText( '\n' ) );
};
}
/**
* A view-to-model converter for `<pre>` with the `<code>` HTML.
*
* Sample input:
*
* <pre><code class="language-javascript">foo();bar();</code></pre>
*
* Sample output:
*
* <codeBlock language="javascript">foo();bar();</codeBlock>
*
* @param {module:engine/view/view~View} editingView
* @param {Array.<module:code-block/codeblock~CodeBlockLanguageDefinition>} languageDefs The normalized language
* configuration passed to the feature.
* @returns {Function} Returns a conversion callback.
*/
export function dataViewToModelCodeBlockInsertion( editingView, languageDefs ) {
// Language names associated with CSS classes:
//
// {
// 'language-php': 'php',
// 'language-python': 'python',
// js: 'javascript',
// ...
// }
const classesToLanguages = getPropertyAssociation( languageDefs, 'class', 'language' );
const defaultLanguageName = languageDefs[ 0 ].language;
return ( evt, data, conversionApi ) => {
const viewCodeElement = data.viewItem;
const viewPreElement = viewCodeElement.parent;
if ( !viewPreElement || !viewPreElement.is( 'element', 'pre' ) ) {
return;
}
// In case of nested code blocks we don't want to convert to another code block.
if ( data.modelCursor.findAncestor( 'codeBlock' ) ) {
return;
}
const { consumable, writer } = conversionApi;
if ( !consumable.test( viewCodeElement, { name: true } ) ) {
return;
}
const codeBlock = writer.createElement( 'codeBlock' );
const viewChildClasses = [ ...viewCodeElement.getClassNames() ];
// As we're to associate each class with a model language, a lack of class (empty class) can be
// also associated with a language if the language definition was configured so. Pushing an empty
// string to make sure the association will work.
if ( !viewChildClasses.length ) {
viewChildClasses.push( '' );
}
// Figure out if any of the <code> element's class names is a valid programming
// language class. If so, use it on the model element (becomes the language of the entire block).
for ( const className of viewChildClasses ) {
const language = classesToLanguages[ className ];
if ( language ) {
writer.setAttribute( 'language', language, codeBlock );
break;
}
}
// If no language value was set, use the default language from the config.
if ( !codeBlock.hasAttribute( 'language' ) ) {
writer.setAttribute( 'language', defaultLanguageName, codeBlock );
}
conversionApi.convertChildren( viewCodeElement, codeBlock );
// Let's try to insert code block.
if ( !conversionApi.safeInsert( codeBlock, data.modelCursor ) ) {
return;
}
consumable.consume( viewCodeElement, { name: true } );
conversionApi.updateConversionResult( codeBlock, data );
};
}
/**
* A view-to-model converter for new line characters in `<pre>`.
*
* Sample input:
*
* <pre><code class="language-javascript">foo();\nbar();</code></pre>
*
* Sample output:
*
* <codeBlock language="javascript">foo();<softBreak></softBreak>bar();</codeBlock>
*
* @returns {Function} Returns a conversion callback.
*/
export function dataViewToModelTextNewlinesInsertion() {
return ( evt, data, { consumable, writer } ) => {
let position = data.modelCursor;
// When node is already converted then do nothing.
if ( !consumable.test( data.viewItem ) ) {
return;
}
// When not inside `codeBlock` then do nothing.
if ( !position.findAncestor( 'codeBlock' ) ) {
return;
}
consumable.consume( data.viewItem );
const text = data.viewItem.data;
const textLines = text.split( '\n' ).map( data => writer.createText( data ) );
const lastLine = textLines[ textLines.length - 1 ];
for ( const node of textLines ) {
writer.insert( node, position );
position = position.getShiftedBy( node.offsetSize );
if ( node !== lastLine ) {
const softBreak = writer.createElement( 'softBreak' );
writer.insert( softBreak, position );
position = writer.createPositionAfter( softBreak );
}
}
data.modelRange = writer.createRange(
data.modelCursor,
position
);
data.modelCursor = position;
};
}
/**
* A view-to-model converter that handles orphan text nodes (white spaces, new lines, etc.)
* that surround `<code>` inside `<pre>`.
*
* Sample input:
*
* // White spaces
* <pre> <code>foo()</code> </pre>
*
* // White spaces
* <pre> <code>foo()</code> </pre>
*
* // White spaces
* <pre> <code>foo()</code> </pre>
*
* // New lines
* <pre>
* <code>foo()</code>
* </pre>
*
* // Redundant text
* <pre>ABC<code>foo()</code>DEF</pre>
*
* Unified output for each case:
*
* <codeBlock language="plaintext">foo()</codeBlock>
*
* @returns {Function} Returns a conversion callback.
*/
export function dataViewToModelOrphanNodeConsumer() {
return ( evt, data, { consumable } ) => {
const preElement = data.viewItem;
// Don't clean up nested pre elements. Their content should stay as it is, they are not upcasted
// to code blocks.
if ( preElement.findAncestor( 'pre' ) ) {
return;
}
const preChildren = Array.from( preElement.getChildren() );
const childCodeElement = preChildren.find( node => node.is( 'element', 'code' ) );
// <code>-less <pre>. It will not upcast to code block in the model, skipping.
if ( !childCodeElement ) {
return;
}
for ( const child of preChildren ) {
if ( child === childCodeElement || !child.is( '$text' ) ) {
continue;
}
// Consuming the orphan to remove it from the input data.
// Second argument in `consumable.consume` is discarded for text nodes.
consumable.consume( child, { name: true } );
}
};
}