Add '_regroup/ckeditor5-mermaid/' from commit 'c15257da7e57b6303fda9744ee4153d1c5311d6f'

git-subtree-dir: _regroup/ckeditor5-mermaid
git-subtree-mainline: 90c0f417131d254e86a4a4ab391122cad0930db7
git-subtree-split: c15257da7e57b6303fda9744ee4153d1c5311d6f
This commit is contained in:
Elian Doran 2025-05-04 15:23:12 +03:00
commit 178903f6b2
42 changed files with 2559 additions and 0 deletions

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# Configurations to normalize the IDE behavior.
# http://editorconfig.org/
root = true
[*]
indent_style = tab
tab_width = 4
charset = utf-8
end_of_line = lf
trim_trailing_whitespace = true
insert_final_newline = true
[*.{js,jsx,ts}]
quote_type = single
[package.json]
indent_style = space
tab_width = 2

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/* eslint-env node */
'use strict';
module.exports = {
extends: 'ckeditor5',
root: true,
ignorePatterns: [
// Ignore the entire `build/` (the DLL build).
'build/**',
// Ignore the entire `dist/`.
'dist/**'
],
rules: {
// This rule disallows importing core DLL packages directly. Imports should be done using the `ckeditor5` package.
// Also, importing non-DLL packages is not allowed. If the package requires other features to work, they should be
// specified as soft-requirements.
// Read more: https://ckeditor.com/docs/ckeditor5/latest/builds/guides/migration/migration-to-26.html#soft-requirements.
'ckeditor5-rules/ckeditor-imports': 'error',
// This rule disallows importing from any path other than the package main entrypoint.
'ckeditor5-rules/allow-imports-only-from-main-package-entry-point': 'error',
// As required by the ECMAScript (ESM) standard, all imports must include a file extension.
// If the import does not include it, this rule will try to automatically detect the correct file extension.
'ckeditor5-rules/require-file-extensions-in-imports': [
'error',
{
extensions: [ '.ts', '.js', '.json' ]
}
]
},
overrides: [
{
files: [ 'tests/**/*.js', 'sample/**/*.js' ],
rules: {
// To write complex tests, you may need to import files that are not exported in DLL files by default.
// Hence, imports CKEditor 5 packages in test files are not checked.
'ckeditor5-rules/ckeditor-imports': 'off'
}
}
]
};

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* text=auto
*.htaccess eol=lf
*.cgi eol=lf
*.sh eol=lf
*.css text
*.htm text
*.html text
*.js text
*.json text
*.php text
*.txt text
*.md text
*.png -text
*.gif -text
*.jpg -text

8
_regroup/ckeditor5-mermaid/.gitignore vendored Normal file
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.nyc_output/
coverage/
node_modules/
yarn.lock
tmp/
build/
dist
yarn.error

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{
"extends": "stylelint-config-ckeditor5",
"ignoreFiles": [
"dist/**/*.css"
]
}

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Software License Agreement
==========================
**CKEditor 5 mermaid feature** (https://ckeditor.com/ckeditor-5/)<br>
Copyright (c) 2003-2022, [CKSource](http://cksource.com) Holding sp. z o.o. All rights reserved.
Licensed under the terms of [GNU General Public License Version 2 or later](http://www.gnu.org/licenses/gpl.html).
Sources of Intellectual Property Included in CKEditor 5 mermaid feature
---------------------------------------------------------------------
Where not otherwise indicated, all CKEditor 5 mermaid feature content is authored by CKSource engineers and consists of CKSource-owned intellectual property.
The following libraries are included in CKEditor 5 mermaid feature under the [MIT license](https://opensource.org/licenses/MIT):
* Lo-Dash - Copyright (c) JS Foundation and other contributors https://js.foundation/. Based on Underscore.js, copyright Jeremy Ashkenas.
* mermaid - Copyright (c) 2014 - 2021 Knut Sveidqvist. (MIT License)
Trademarks
----------
**CKEditor** is a trademark of [CKSource](http://cksource.com) Holding sp. z o.o. All other brand and product names are trademarks, registered trademarks or service marks of their respective holders.

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CKEditor 5 Mermaid feature
=================================
Warning: This is an experimental plugin that comes with no support, use it at your own risk.
This package contains a Mermaid feature for CKEditor 5.
## CKEditor 5 Mermaid - Running manual test
You can test all of the features of the `ckeditor5-mermaid` plugin with the manual test sample.
After installing dependencies it's enough to execute the following script at the root of your local clone of the project:
```
yarn start
```
## License
See [LICENSE.md](LICENSE.md) file.
### Trademarks
**CKEditor** is a trademark of [CKSource](https://cksource.com) Holding sp. z o.o. All other brand and product names are trademarks, registered trademarks or service marks of their respective holders.

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{
"name": "@ckeditor/ckeditor5-mermaid",
"version": "0.0.4",
"description": "Mermaid widget for CKEditor 5.",
"private": true,
"keywords": [
"ckeditor",
"ckeditor5",
"ckeditor 5",
"ckeditor5-feature",
"ckeditor5-plugin",
"ckeditor5-mermaid"
],
"type": "module",
"main": "src/index.js",
"license": "SEE LICENSE IN LICENSE.md",
"author": "CKSource (https://cksource.com/)",
"homepage": "https://github.com/ckeditor/ckeditor5-mermaid",
"bugs": "https://github.com/ckeditor/ckeditor5-mermaid/issues",
"engines": {
"node": ">=18.0.0",
"npm": ">=5.7.1"
},
"files": [
"lang",
"src/**/*.js",
"src/**/*.css",
"theme",
"build",
"ckeditor5-metadata.json"
],
"dependencies": {
"ckeditor5": "43.2.0",
"lodash-es": "^4.17.15"
},
"devDependencies": {
"@ckeditor/ckeditor5-dev-build-tools": "^42.0.0",
"@ckeditor/ckeditor5-inspector": "^4.0.0",
"@ckeditor/ckeditor5-package-tools": "^2.1.0",
"ckeditor5": "latest",
"eslint": "^7.32.0",
"eslint-config-ckeditor5": "^6.0.0",
"http-server": "^14.1.1",
"husky": "^4.2.5",
"lint-staged": "^12.0.0",
"stylelint": "^13.13.1",
"stylelint-config-ckeditor5": ">=6.0.0"
},
"peerDependencies": {
"ckeditor5": ">=43.0.0 || ^0.0.0-nightly"
},
"scripts": {
"dll:build": "ckeditor5-package-tools dll:build",
"dll:serve": "http-server ./ -o sample/dll.html",
"lint": "eslint --quiet --ext .ts src/",
"lint:fix": "eslint --quiet --fix --ext .ts src/",
"stylelint": "stylelint --quiet --allow-empty-input 'theme/**/*.css'",
"test": "ckeditor5-package-tools test",
"prepare": "yarn run dll:build",
"prepublishOnly": "ckeditor5-package-tools export-package-as-javascript",
"postpublish": "ckeditor5-package-tools export-package-as-typescript",
"start": "ckeditor5-package-tools start"
},
"lint-staged": {
"**/*.js": [
"eslint --quiet"
],
"**/*.css": [
"stylelint --quiet --allow-empty-input"
]
},
"husky": {
"hooks": {
"pre-commit": "lint-staged"
}
}
}

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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
*/
/* globals console, window, document */
import { ClassicEditor } from '@ckeditor/ckeditor5-editor-classic';
import { Typing } from '@ckeditor/ckeditor5-typing';
import { Paragraph } from '@ckeditor/ckeditor5-paragraph';
import { Undo } from '@ckeditor/ckeditor5-undo';
import { Enter } from '@ckeditor/ckeditor5-enter';
import { Clipboard } from '@ckeditor/ckeditor5-clipboard';
import { Link } from '@ckeditor/ckeditor5-link';
import { Bold, Italic } from '@ckeditor/ckeditor5-basic-styles';
import { CodeBlock } from '@ckeditor/ckeditor5-code-block';
import CKEditorInspector from '@ckeditor/ckeditor5-inspector';
import Mermaid from '../src/mermaid.js';
ClassicEditor
.create( document.querySelector( '#editor' ), {
plugins: [
Typing,
Paragraph,
Undo,
Enter,
Clipboard,
Link,
Bold,
Italic,
CodeBlock,
Mermaid
],
toolbar: [ 'bold', 'italic', 'link', 'undo', 'redo', 'codeBlock', 'mermaid' ],
codeBlock: {
languages: [
{ language: 'plaintext', label: 'Plain text', class: '' },
{ language: 'javascript', label: 'JavaScript' },
{ language: 'python', label: 'Python' },
{ language: 'mermaid', label: 'Mermaid' }
]
}
} )
.then( editor => {
window.editor = editor;
CKEditorInspector.attach( editor );
window.console.log( 'CKEditor 5 is ready.', editor );
} )
.catch( err => {
console.error( err.stack );
} );

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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8">
<title>CKEditor 5 Mermaid widget Development Sample</title>
<style>
body {
max-width: 800px;
margin: 20px auto;
}
</style>
</head>
<body>
<h1>CKEditor 5 Mermaid widget Development Sample</h1>
<div id="editor">
</div>
<!-- DLL builds are served from the `node_modules/` directory -->
<script src="../node_modules/ckeditor5/build/ckeditor5-dll.js"></script>
<script src="../node_modules/@ckeditor/ckeditor5-editor-classic/build/editor-classic.js"></script>
<script src="../node_modules/@ckeditor/ckeditor5-code-block/build/code-block.js"></script>
<script src="../node_modules/@ckeditor/ckeditor5-essentials/build/essentials.js"></script>
<script src="../node_modules/@ckeditor/ckeditor5-basic-styles/build/basic-styles.js"></script>
<script src="../node_modules/@ckeditor/ckeditor5-heading/build/heading.js"></script>
<script src="../node_modules/@ckeditor/ckeditor5-autoformat/build/autoformat.js"></script>
<script src="../node_modules/@ckeditor/ckeditor5-block-quote/build/block-quote.js"></script>
<script src="../node_modules/@ckeditor/ckeditor5-image/build/image.js"></script>
<script src="../node_modules/@ckeditor/ckeditor5-link/build/link.js"></script>
<script src="../node_modules/@ckeditor/ckeditor5-indent/build/indent.js"></script>
<script src="../node_modules/@ckeditor/ckeditor5-media-embed/build/media-embed.js"></script>
<script src="../node_modules/@ckeditor/ckeditor5-list/build/list.js"></script>
<script src="../node_modules/@ckeditor/ckeditor5-table/build/table.js"></script>
<!-- The "@ckeditor/ckeditor5-mermaid" package DLL build is served from the `build/` directory -->
<script src="../build/mermaid.js"></script>
<script>
console.log( 'Objects exported by the DLL build:', CKEditor5[ 'mermaid' ] );
CKEditor5.editorClassic.ClassicEditor
.create( document.querySelector( '#editor' ), {
plugins: [
CKEditor5[ 'mermaid' ].Mermaid,
CKEditor5.essentials.Essentials,
CKEditor5.autoformat.Autoformat,
CKEditor5.blockQuote.BlockQuote,
CKEditor5.basicStyles.Bold,
CKEditor5.heading.Heading,
CKEditor5.image.Image,
CKEditor5.image.ImageCaption,
CKEditor5.image.ImageStyle,
CKEditor5.image.ImageToolbar,
CKEditor5.image.ImageUpload,
CKEditor5.indent.Indent,
CKEditor5.basicStyles.Italic,
CKEditor5.link.Link,
CKEditor5.list.List,
CKEditor5.mediaEmbed.MediaEmbed,
CKEditor5.paragraph.Paragraph,
CKEditor5.table.Table,
CKEditor5.table.TableToolbar,
CKEditor5.codeBlock.CodeBlock,
CKEditor5.basicStyles.Code,
CKEditor5.upload.Base64UploadAdapter
],
toolbar: [
'mermaid',
'|',
'undo',
'redo',
'|',
'heading',
'|',
'bold',
'italic',
'link',
'code',
'bulletedList',
'numberedList',
'|',
'outdent',
'indent',
'|',
'uploadImage',
'blockQuote',
'insertTable',
'mediaEmbed',
'codeBlock'
],
image: {
toolbar: [
'imageStyle:inline',
'imageStyle:block',
'imageStyle:side',
'|',
'imageTextAlternative'
]
},
table: {
contentToolbar: [
'tableColumn',
'tableRow',
'mergeTableCells'
]
}
} )
.then( editor => {
window.editor = editor;
} )
.catch( error => {
console.error( 'There was a problem initializing the editor.', error );
} );
</script>
</body>
</html>

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#!/usr/bin/env node
/**
* @license Copyright (c) 2020-2024, CKSource Holding sp. z o.o. All rights reserved.
* For licensing, see LICENSE.md.
*/
/* eslint-env node */
import { createRequire } from 'module';
import upath from 'upath';
import chalk from 'chalk';
import { build } from '@ckeditor/ckeditor5-dev-build-tools';
function dist( path ) {
return upath.join( 'dist', path );
}
( async () => {
/**
* Step 1
*/
console.log( chalk.cyan( '1/2: Generating NPM build...' ) );
const require = createRequire( import.meta.url );
const pkg = require( upath.resolve( process.cwd(), './package.json' ) );
await build( {
input: 'src/index.js',
output: dist( './index.js' ),
external: [
'ckeditor5',
'ckeditor5-premium-features',
...Object.keys( {
...pkg.dependencies,
...pkg.peerDependencies
} )
],
clean: true,
sourceMap: true,
translations: '**/*.po'
} );
/**
* Step 2
*/
console.log( chalk.cyan( '2/2: Generating browser build...' ) );
await build( {
input: 'src/index.js',
output: dist( 'browser/index.js' ),
sourceMap: true,
minify: true,
browser: true,
name: '@ckeditor/ckeditor5-mermaid',
external: [
'ckeditor5',
'ckeditor5-premium-features'
]
} );
} )();

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/**
* @module mermaid/insertmermaidcommand
*/
import { Command } from 'ckeditor5/src/core.js';
const MOCK_MERMAID_MARKUP = `flowchart TB
A --> B
B --> C`;
/**
* The insert mermaid command.
*
* Allows to insert mermaid.
*
* @extends module:core/command~Command
*/
export default class InsertMermaidCommand extends Command {
/**
* @inheritDoc
*/
refresh() {
const documentSelection = this.editor.model.document.selection;
const selectedElement = documentSelection.getSelectedElement();
if ( selectedElement && selectedElement.name === 'mermaid' ) {
this.isEnabled = false;
} else {
this.isEnabled = true;
}
}
/**
* @inheritDoc
*/
execute() {
const editor = this.editor;
const model = editor.model;
let mermaidItem;
model.change( writer => {
mermaidItem = writer.createElement( 'mermaid', {
displayMode: 'split',
source: MOCK_MERMAID_MARKUP
} );
model.insertContent( mermaidItem );
} );
return mermaidItem;
}
}

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/**
* @module mermaid/mermaidpreviewcommand
*/
import { Command } from 'ckeditor5/src/core.js';
import { checkIsOn } from '../utils.js';
/**
* The mermaid preview command.
*
* Allows to switch to a preview mode.
*
* @extends module:core/command~Command
*/
export default class MermaidPreviewCommand extends Command {
/**
* @inheritDoc
*/
refresh() {
const editor = this.editor;
const documentSelection = editor.model.document.selection;
const selectedElement = documentSelection.getSelectedElement();
const isSelectedElementMermaid = selectedElement && selectedElement.name === 'mermaid';
if ( isSelectedElementMermaid || documentSelection.getLastPosition().findAncestor( 'mermaid' ) ) {
this.isEnabled = !!selectedElement;
} else {
this.isEnabled = false;
}
this.value = checkIsOn( editor, 'preview' );
}
/**
* @inheritDoc
*/
execute() {
const editor = this.editor;
const model = editor.model;
const documentSelection = this.editor.model.document.selection;
const mermaidItem = documentSelection.getSelectedElement() || documentSelection.getLastPosition().parent;
model.change( writer => {
if ( mermaidItem.getAttribute( 'displayMode' ) !== 'preview' ) {
writer.setAttribute( 'displayMode', 'preview', mermaidItem );
}
} );
}
}

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/**
* @module mermaid/mermaidsourceviewcommand
*/
import { Command } from 'ckeditor5/src/core.js';
import { checkIsOn } from '../utils.js';
/**
* The mermaid source view command.
*
* Allows to switch to a source view mode.
*
* @extends module:core/command~Command
*/
export default class MermaidSourceViewCommand extends Command {
/**
* @inheritDoc
*/
refresh() {
const editor = this.editor;
const documentSelection = editor.model.document.selection;
const selectedElement = documentSelection.getSelectedElement();
const isSelectedElementMermaid = selectedElement && selectedElement.name === 'mermaid';
if ( isSelectedElementMermaid || documentSelection.getLastPosition().findAncestor( 'mermaid' ) ) {
this.isEnabled = !!selectedElement;
} else {
this.isEnabled = false;
}
this.value = checkIsOn( editor, 'source' );
}
/**
* @inheritDoc
*/
execute() {
const editor = this.editor;
const model = editor.model;
const documentSelection = this.editor.model.document.selection;
const mermaidItem = documentSelection.getSelectedElement() || documentSelection.getLastPosition().parent;
model.change( writer => {
if ( mermaidItem.getAttribute( 'displayMode' ) !== 'source' ) {
writer.setAttribute( 'displayMode', 'source', mermaidItem );
}
} );
}
}

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/**
* @module mermaid/mermaidsplitviewcommand
*/
import { Command } from 'ckeditor5/src/core.js';
import { checkIsOn } from '../utils.js';
/**
* The mermaid split view command.
*
* Allows to switch to a split view mode.
*
* @extends module:core/command~Command
*/
export default class MermaidSplitViewCommand extends Command {
/**
* @inheritDoc
*/
refresh() {
const editor = this.editor;
const documentSelection = editor.model.document.selection;
const selectedElement = documentSelection.getSelectedElement();
const isSelectedElementMermaid = selectedElement && selectedElement.name === 'mermaid';
if ( isSelectedElementMermaid || documentSelection.getLastPosition().findAncestor( 'mermaid' ) ) {
this.isEnabled = !!selectedElement;
} else {
this.isEnabled = false;
}
this.value = checkIsOn( editor, 'split' );
}
/**
* @inheritDoc
*/
execute() {
const editor = this.editor;
const model = editor.model;
const documentSelection = this.editor.model.document.selection;
const mermaidItem = documentSelection.getSelectedElement() || documentSelection.getLastPosition().parent;
model.change( writer => {
if ( mermaidItem.getAttribute( 'displayMode' ) !== 'split' ) {
writer.setAttribute( 'displayMode', 'split', mermaidItem );
}
} );
}
}

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/**
* @module mermaid
*/
import infoIcon from './../theme/icons/info.svg';
import insertMermaidIcon from './../theme/icons/insert.svg';
import previewModeIcon from './../theme/icons/preview-mode.svg';
import splitModeIcon from './../theme/icons/split-mode.svg';
import sourceModeIcon from './../theme/icons/source-mode.svg';
export { default as Mermaid } from './mermaid.js';
export const icons = {
infoIcon,
insertMermaidIcon,
previewModeIcon,
splitModeIcon,
sourceModeIcon
};

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/**
* @module mermaid/mermaid
*/
import { Plugin } from 'ckeditor5/src/core.js';
import MermaidEditing from './mermaidediting.js';
import MermaidToolbar from './mermaidtoolbar.js';
import MermaidUI from './mermaidui.js';
import '../theme/mermaid.css';
export default class Mermaid extends Plugin {
/**
* @inheritDoc
*/
static get requires() {
return [ MermaidEditing, MermaidToolbar, MermaidUI ];
}
/**
* @inheritDoc
*/
static get pluginName() {
return 'Mermaid';
}
}

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/**
* @module mermaid/mermaidediting
*/
import { Plugin } from 'ckeditor5/src/core.js';
import { toWidget } from 'ckeditor5/src/widget.js';
import { debounce } from 'lodash-es';
import MermaidPreviewCommand from './commands/mermaidPreviewCommand.js';
import MermaidSourceViewCommand from './commands/mermaidSourceViewCommand.js';
import MermaidSplitViewCommand from './commands/mermaidSplitViewCommand.js';
import InsertMermaidCommand from './commands/insertMermaidCommand.js';
// Time in milliseconds.
const DEBOUNCE_TIME = 300;
/* global window */
export default class MermaidEditing extends Plugin {
/**
* @inheritDoc
*/
static get pluginName() {
return 'MermaidEditing';
}
/**
* @inheritDoc
*/
init() {
this._registerCommands();
this._defineConverters();
this._config = this.editor.config.get("mermaid");
}
/**
* @inheritDoc
*/
afterInit() {
this.editor.model.schema.register( 'mermaid', {
allowAttributes: [ 'displayMode', 'source' ],
allowWhere: '$block',
isObject: true
} );
}
/**
* @inheritDoc
*/
_registerCommands() {
const editor = this.editor;
editor.commands.add( 'mermaidPreviewCommand', new MermaidPreviewCommand( editor ) );
editor.commands.add( 'mermaidSplitViewCommand', new MermaidSplitViewCommand( editor ) );
editor.commands.add( 'mermaidSourceViewCommand', new MermaidSourceViewCommand( editor ) );
editor.commands.add( 'insertMermaidCommand', new InsertMermaidCommand( editor ) );
}
/**
* Adds converters.
*
* @private
*/
_defineConverters() {
const editor = this.editor;
editor.data.downcastDispatcher.on( 'insert:mermaid', this._mermaidDataDowncast.bind( this ) );
editor.editing.downcastDispatcher.on( 'insert:mermaid', this._mermaidDowncast.bind( this ) );
editor.editing.downcastDispatcher.on( 'attribute:source:mermaid', this._sourceAttributeDowncast.bind( this ) );
editor.data.upcastDispatcher.on( 'element:code', this._mermaidUpcast.bind( this ), { priority: 'high' } );
editor.conversion.for( 'editingDowncast' ).attributeToAttribute( {
model: {
name: 'mermaid',
key: 'displayMode'
},
view: modelAttributeValue => ( {
key: 'class',
value: 'ck-mermaid__' + modelAttributeValue + '-mode'
} )
} );
}
/**
*
* @private
* @param {*} evt
* @param {*} data
* @param {*} conversionApi
*/
_mermaidDataDowncast( evt, data, conversionApi ) {
const model = this.editor.model;
const { writer, mapper } = conversionApi;
if ( !conversionApi.consumable.consume( data.item, 'insert' ) ) {
return;
}
const targetViewPosition = mapper.toViewPosition( model.createPositionBefore( data.item ) );
// For downcast we're using only language-mermaid class. We don't set class to `mermaid language-mermaid` as
// multiple markdown converters that we have seen are using only `language-mermaid` class and not `mermaid` alone.
const code = writer.createContainerElement( 'code', {
class: 'language-mermaid'
} );
const pre = writer.createContainerElement( 'pre', {
spellcheck: 'false'
} );
const sourceTextNode = writer.createText( data.item.getAttribute( 'source' ) );
writer.insert( model.createPositionAt( code, 'end' ), sourceTextNode );
writer.insert( model.createPositionAt( pre, 'end' ), code );
writer.insert( targetViewPosition, pre );
mapper.bindElements( data.item, code );
}
/**
*
* @private
* @param {*} evt
* @param {*} data
* @param {*} conversionApi
*/
_mermaidDowncast( evt, data, conversionApi ) {
const { writer, mapper, consumable } = conversionApi;
const { editor } = this;
const { model, t } = editor;
const that = this;
if ( !consumable.consume( data.item, 'insert' ) ) {
return;
}
const targetViewPosition = mapper.toViewPosition( model.createPositionBefore( data.item ) );
const wrapperAttributes = {
class: [ 'ck-mermaid__wrapper' ]
};
const textareaAttributes = {
class: [ 'ck-mermaid__editing-view' ],
placeholder: t( 'Insert mermaid source code' ),
'data-cke-ignore-events': true
};
const wrapper = writer.createContainerElement( 'div', wrapperAttributes );
const editingContainer = writer.createUIElement( 'textarea', textareaAttributes, createEditingTextarea );
const previewContainer = writer.createUIElement( 'div', { class: [ 'ck-mermaid__preview' ] }, createMermaidPreview );
writer.insert( writer.createPositionAt( wrapper, 'start' ), previewContainer );
writer.insert( writer.createPositionAt( wrapper, 'start' ), editingContainer );
writer.insert( targetViewPosition, wrapper );
mapper.bindElements( data.item, wrapper );
return toWidget( wrapper, writer, {
widgetLabel: t( 'Mermaid widget' ),
hasSelectionHandle: true
} );
function createEditingTextarea( domDocument ) {
const domElement = this.toDomElement( domDocument );
domElement.value = data.item.getAttribute( 'source' );
const debouncedListener = debounce( event => {
editor.model.change( writer => {
writer.setAttribute( 'source', event.target.value, data.item );
} );
}, DEBOUNCE_TIME );
domElement.addEventListener( 'input', debouncedListener );
/* Workaround for internal #1544 */
domElement.addEventListener( 'focus', () => {
const model = editor.model;
const selectedElement = model.document.selection.getSelectedElement();
// Move the selection onto the mermaid widget if it's currently not selected.
if ( selectedElement !== data.item ) {
model.change( writer => writer.setSelection( data.item, 'on' ) );
}
}, true );
return domElement;
}
function createMermaidPreview( domDocument ) {
// Taking the text from the wrapper container element for now
const mermaidSource = data.item.getAttribute( 'source' );
const domElement = this.toDomElement( domDocument );
domElement.innerHTML = mermaidSource;
window.setTimeout( () => {
// @todo: by the looks of it the domElement needs to be hooked to tree in order to allow for rendering.
that._renderMermaid( domElement );
}, 100 );
return domElement;
}
}
/**
*
* @param {*} evt
* @param {*} data
* @param {*} conversionApi
* @returns
*/
_sourceAttributeDowncast( evt, data, conversionApi ) {
// @todo: test whether the attribute was consumed.
const newSource = data.attributeNewValue;
const domConverter = this.editor.editing.view.domConverter;
if ( newSource ) {
const mermaidView = conversionApi.mapper.toViewElement( data.item );
for ( const child of mermaidView.getChildren() ) {
if ( child.name === 'textarea' && child.hasClass( 'ck-mermaid__editing-view' ) ) {
const domEditingTextarea = domConverter.viewToDom( child, window.document );
if ( domEditingTextarea.value != newSource ) {
domEditingTextarea.value = newSource;
}
} else if ( child.name === 'div' && child.hasClass( 'ck-mermaid__preview' ) ) {
// @todo: we could optimize this and not refresh mermaid if widget is in source mode.
const domPreviewWrapper = domConverter.viewToDom( child, window.document );
if ( domPreviewWrapper ) {
domPreviewWrapper.innerHTML = newSource;
domPreviewWrapper.removeAttribute( 'data-processed' );
this._renderMermaid( domPreviewWrapper );
}
}
}
}
}
/**
*
* @private
* @param {*} evt
* @param {*} data
* @param {*} conversionApi
*/
_mermaidUpcast( evt, data, conversionApi ) {
const viewCodeElement = data.viewItem;
const hasPreElementParent = !viewCodeElement.parent || !viewCodeElement.parent.is( 'element', 'pre' );
const hasCodeAncestors = data.modelCursor.findAncestor( 'code' );
const { consumable, writer } = conversionApi;
if ( !viewCodeElement.hasClass( 'language-mermaid' ) || hasPreElementParent || hasCodeAncestors ) {
return;
}
if ( !consumable.test( viewCodeElement, { name: true } ) ) {
return;
}
const mermaidSource = Array.from( viewCodeElement.getChildren() )
.filter( item => item.is( '$text' ) )
.map( item => item.data )
.join( '' );
const mermaidElement = writer.createElement( 'mermaid', {
source: mermaidSource,
displayMode: 'split'
} );
// Let's try to insert mermaid element.
if ( !conversionApi.safeInsert( mermaidElement, data.modelCursor ) ) {
return;
}
consumable.consume( viewCodeElement, { name: true } );
conversionApi.updateConversionResult( mermaidElement, data );
}
/**
* Renders Mermaid in a given `domElement`. Expect this domElement to have mermaid
* source set as text content.
*
* @param {HTMLElement} domElement
*/
async _renderMermaid( domElement ) {
if (!window.mermaid && typeof this._config?.lazyLoad === "function") {
this.mermaid = await this._config.lazyLoad();
}
this.mermaid.init( this._config.config, domElement );
}
}

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/**
* @module mermaid/mermaidtoolbar
*/
import { Plugin } from 'ckeditor5/src/core.js';
import { WidgetToolbarRepository } from 'ckeditor5/src/widget.js';
export default class MermaidToolbar extends Plugin {
/**
* @inheritDoc
*/
static get requires() {
return [ WidgetToolbarRepository ];
}
/**
* @inheritDoc
*/
static get pluginName() {
return 'MermaidToolbar';
}
/**
* @inheritDoc
*/
afterInit() {
const editor = this.editor;
const t = editor.t;
const widgetToolbarRepository = editor.plugins.get( WidgetToolbarRepository );
const mermaidToolbarItems = [ 'mermaidSourceView', 'mermaidSplitView', 'mermaidPreview', '|', 'mermaidInfo' ];
if ( mermaidToolbarItems ) {
widgetToolbarRepository.register( 'mermaidToolbar', {
ariaLabel: t( 'Mermaid toolbar' ),
items: mermaidToolbarItems,
getRelatedElement: selection => getSelectedElement( selection )
} );
}
}
}
function getSelectedElement( selection ) {
const viewElement = selection.getSelectedElement();
if ( viewElement && viewElement.hasClass( 'ck-mermaid__wrapper' ) ) {
return viewElement;
}
return null;
}

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/**
* @module mermaid/mermaidui
*/
import { Plugin } from 'ckeditor5/src/core.js';
import { ButtonView } from 'ckeditor5/src/ui.js';
import insertMermaidIcon from '../theme/icons/insert.svg';
import previewModeIcon from '../theme/icons/preview-mode.svg';
import splitModeIcon from '../theme/icons/split-mode.svg';
import sourceModeIcon from '../theme/icons/source-mode.svg';
import infoIcon from '../theme/icons/info.svg';
/* global window, document */
export default class MermaidUI extends Plugin {
/**
* @inheritDoc
*/
static get pluginName() {
return 'MermaidUI';
}
/**
* @inheritDoc
*/
init() {
this._addButtons();
}
/**
* Adds all mermaid-related buttons.
*
* @private
*/
_addButtons() {
const editor = this.editor;
this._addInsertMermaidButton();
this._addMermaidInfoButton();
this._createToolbarButton( editor, 'mermaidPreview', 'Preview', previewModeIcon );
this._createToolbarButton( editor, 'mermaidSourceView', 'Source view', sourceModeIcon );
this._createToolbarButton( editor, 'mermaidSplitView', 'Split view', splitModeIcon );
}
/**
* Adds the button for inserting mermaid.
*
* @private
*/
_addInsertMermaidButton() {
const editor = this.editor;
const t = editor.t;
const view = editor.editing.view;
editor.ui.componentFactory.add( 'mermaid', locale => {
const buttonView = new ButtonView( locale );
const command = editor.commands.get( 'insertMermaidCommand' );
buttonView.set( {
label: t( 'Insert Mermaid diagram' ),
icon: insertMermaidIcon,
tooltip: true
} );
buttonView.bind( 'isOn', 'isEnabled' ).to( command, 'value', 'isEnabled' );
// Execute the command when the button is clicked.
command.listenTo( buttonView, 'execute', () => {
const mermaidItem = editor.execute( 'insertMermaidCommand' );
const mermaidItemViewElement = editor.editing.mapper.toViewElement( mermaidItem );
view.scrollToTheSelection();
view.focus();
if ( mermaidItemViewElement ) {
const mermaidItemDomElement = view.domConverter.viewToDom( mermaidItemViewElement, document );
if ( mermaidItemDomElement ) {
mermaidItemDomElement.querySelector( '.ck-mermaid__editing-view' ).focus();
}
}
} );
return buttonView;
} );
}
/**
* Adds the button linking to the mermaid guide.
*
* @private
*/
_addMermaidInfoButton() {
const editor = this.editor;
const t = editor.t;
editor.ui.componentFactory.add( 'mermaidInfo', locale => {
const buttonView = new ButtonView( locale );
const link = 'https://ckeditor.com/blog/basic-overview-of-creating-flowcharts-using-mermaid/';
buttonView.set( {
label: t( 'Read more about Mermaid diagram syntax' ),
icon: infoIcon,
tooltip: true
} );
buttonView.on( 'execute', () => {
window.open( link, '_blank', 'noopener' );
} );
return buttonView;
} );
}
/**
* Adds the mermaid balloon toolbar button.
*
* @private
* @param {module:core/editor/editor~Editor} editor
* @param {String} name Name of the button.
* @param {String} label Label for the button.
* @param {String} icon The button icon.
*/
_createToolbarButton( editor, name, label, icon ) {
const t = editor.t;
editor.ui.componentFactory.add( name, locale => {
const buttonView = new ButtonView( locale );
const command = editor.commands.get( `${ name }Command` );
buttonView.set( {
label: t( label ),
icon,
tooltip: true
} );
buttonView.bind( 'isOn', 'isEnabled' ).to( command, 'value', 'isEnabled' );
// Execute the command when the button is clicked.
command.listenTo( buttonView, 'execute', () => {
editor.execute( `${ name }Command` );
editor.editing.view.scrollToTheSelection();
editor.editing.view.focus();
} );
return buttonView;
} );
}
}

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/**
* @license Copyright (c) 2003-2022, CKSource Holding sp. z o.o. All rights reserved.
* For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license
*/
/**
* @module mermaid/utils
*/
/**
* Helper function for setting the `isOn` state of buttons.
*
* @private
* @param {module:core/editor/editor~Editor} editor
* @param {String} commandName Short name of the command.
* @returns {Boolean}
*/
export function checkIsOn( editor, commandName ) {
const selection = editor.model.document.selection;
const mermaidItem = selection.getSelectedElement() || selection.getLastPosition().parent;
if ( mermaidItem && mermaidItem.is( 'element', 'mermaid' ) && mermaidItem.getAttribute( 'displayMode' ) === commandName ) {
return true;
}
return false;
}

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import { ClassicEditor } from '@ckeditor/ckeditor5-editor-classic';
import { Paragraph } from '@ckeditor/ckeditor5-paragraph';
import {
_setModelData as setModelData,
_getModelData as getModelData
} from '@ckeditor/ckeditor5-engine';
import InsertMermaidCommand from '../../src/commands/insertMermaidCommand.js';
import MermaidEditing from '../../src/mermaidediting.js';
/* global document */
describe( 'InsertMermaidCommand', () => {
let domElement, editor, model, command;
beforeEach( async () => {
domElement = document.createElement( 'div' );
document.body.appendChild( domElement );
editor = await ClassicEditor.create( domElement, {
plugins: [
MermaidEditing,
Paragraph
]
} );
model = editor.model;
command = new InsertMermaidCommand( editor );
} );
afterEach( () => {
domElement.remove();
return editor.destroy();
} );
describe( '#isEnabled', () => {
describe( 'should be false', () => {
it( 'when selection is inside mermaid', () => {
setModelData( model,
'<paragraph>foo</paragraph>' +
'<mermaid source="flowchart TB\nA --> B\nB --> C">[]</mermaid>'
);
expect( command.isEnabled ).to.be.false;
} );
it( 'when mermaid is selected', () => {
setModelData( model,
'<paragraph>foo</paragraph>' +
'[<mermaid source="flowchart TB\nA --> B\nB --> C"></mermaid>]'
);
expect( command.isEnabled ).to.be.false;
} );
} );
describe( 'should be true', () => {
it( 'when text is selected', () => {
setModelData( model,
'<paragraph>[foo]</paragraph>' +
'<mermaid source="flowchart TB\nA --> B\nB --> C"></mermaid>'
);
expect( command.isEnabled ).to.be.true;
} );
it( 'when mermaid is part of the selection', () => {
setModelData( model,
'<paragraph>[foo</paragraph>' +
'<mermaid source="flowchart TB\nA --> B\nB --> C"></mermaid>' +
'<paragraph>b]az</paragraph>'
);
expect( command.isEnabled ).to.be.true;
} );
} );
} );
describe( 'execute()', () => {
it( 'should add sample mermaid', () => {
setModelData( model,
'<paragraph>[foo]</paragraph>'
);
command.execute();
expect( getModelData( model, { withoutSelection: true } ) ).to.equal(
'<mermaid displayMode="split" source="flowchart TB\nA --> B\nB --> C"></mermaid>'
);
} );
} );
} );

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import { ClassicEditor } from '@ckeditor/ckeditor5-editor-classic';
import { Paragraph } from '@ckeditor/ckeditor5-paragraph';
import {
_setModelData as setModelData,
_getModelData as getModelData
} from '@ckeditor/ckeditor5-engine';
import MermaidPreviewCommand from '../../src/commands/mermaidPreviewCommand.js';
import MermaidEditing from '../../src/mermaidediting.js';
/* global document */
describe( 'MermaidPreviewCommand', () => {
let domElement, editor, model, command;
beforeEach( async () => {
domElement = document.createElement( 'div' );
document.body.appendChild( domElement );
editor = await ClassicEditor.create( domElement, {
plugins: [
MermaidEditing,
Paragraph
]
} );
model = editor.model;
command = new MermaidPreviewCommand( editor );
} );
afterEach( () => {
domElement.remove();
return editor.destroy();
} );
describe( '#value', () => {
it( 'should be true when mermaid element has displayMode attribute equal to "preview"', () => {
setModelData( model, '<mermaid displayMode="preview" source="foo"></mermaid>' );
expect( command.value ).to.equal( true );
} );
it( 'should be false when mermaid element has displayMode attribute equal to "split"', () => {
setModelData( model, '<mermaid displayMode="split" source="foo"></mermaid>' );
expect( command.value ).to.equal( false );
} );
it( 'should be false when mermaid element has displayMode attribute equal to "source"', () => {
setModelData( model, '<mermaid displayMode="source" source="foo"></mermaid>' );
expect( command.value ).to.equal( false );
} );
} );
describe( '#isEnabled', () => {
describe( 'should be false', () => {
it( 'when text is selected', () => {
setModelData( model,
'<paragraph>[foo]</paragraph>' +
'<mermaid source="flowchart TB\nA --> B\nB --> C"></mermaid>'
);
expect( command.isEnabled ).to.be.false;
} );
it( 'when mermaid is part of the selection', () => {
setModelData( model,
'<paragraph>[foo</paragraph>' +
'<mermaid source="flowchart TB\nA --> B\nB --> C"></mermaid>' +
'<paragraph>b]az</paragraph>'
);
expect( command.isEnabled ).to.be.false;
} );
} );
describe( 'should be true', () => {
it( 'when selection is inside mermaid', () => {
setModelData( model,
'<paragraph>foo</paragraph>' +
'<mermaid source="flowchart TB\nA --> B\nB --> C">[]</mermaid>'
);
expect( command.isEnabled ).to.be.true;
} );
it( 'when mermaid is selected', () => {
setModelData( model,
'<paragraph>foo</paragraph>' +
'[<mermaid source="flowchart TB\nA --> B\nB --> C"></mermaid>]'
);
expect( command.isEnabled ).to.be.true;
} );
} );
} );
describe( 'execute()', () => {
it( 'should change displayMode to "preview" for mermaid', () => {
setModelData( model,
'[<mermaid displayMode="source" source="foo"></mermaid>]'
);
command.execute();
expect( getModelData( model ) ).to.equal(
'[<mermaid displayMode="preview" source="foo"></mermaid>]'
);
} );
} );
} );

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import { ClassicEditor } from '@ckeditor/ckeditor5-editor-classic';
import { Paragraph } from '@ckeditor/ckeditor5-paragraph';
import {
_setModelData as setModelData,
_getModelData as getModelData
} from '@ckeditor/ckeditor5-engine';
import MermaidSourceViewCommand from '../../src/commands/mermaidSourceViewCommand.js';
import MermaidEditing from '../../src/mermaidediting.js';
/* global document */
describe( 'MermaidSourceViewCommand', () => {
let domElement, editor, model, command;
beforeEach( async () => {
domElement = document.createElement( 'div' );
document.body.appendChild( domElement );
editor = await ClassicEditor.create( domElement, {
plugins: [
MermaidEditing,
Paragraph
]
} );
model = editor.model;
command = new MermaidSourceViewCommand( editor );
} );
afterEach( () => {
domElement.remove();
return editor.destroy();
} );
describe( '#value', () => {
it( 'should be true when mermaid element has displayMode attribute equal to "preview"', () => {
setModelData( model, '<mermaid displayMode="preview" source="foo"></mermaid>' );
expect( command.value ).to.equal( false );
} );
it( 'should be false when mermaid element has displayMode attribute equal to "split"', () => {
setModelData( model, '<mermaid displayMode="split" source="foo"></mermaid>' );
expect( command.value ).to.equal( false );
} );
it( 'should be false when mermaid element has displayMode attribute equal to "source"', () => {
setModelData( model, '<mermaid displayMode="source" source="foo"></mermaid>' );
expect( command.value ).to.equal( true );
} );
} );
describe( '#isEnabled', () => {
describe( 'should be false', () => {
it( 'when text is selected', () => {
setModelData( model,
'<paragraph>[foo]</paragraph>' +
'<mermaid source="flowchart TB\nA --> B\nB --> C"></mermaid>'
);
expect( command.isEnabled ).to.be.false;
} );
it( 'when mermaid is part of the selection', () => {
setModelData( model,
'<paragraph>[foo</paragraph>' +
'<mermaid source="flowchart TB\nA --> B\nB --> C"></mermaid>' +
'<paragraph>b]az</paragraph>'
);
expect( command.isEnabled ).to.be.false;
} );
} );
describe( 'should be true', () => {
it( 'when selection is inside mermaid', () => {
setModelData( model,
'<paragraph>foo</paragraph>' +
'<mermaid source="flowchart TB\nA --> B\nB --> C">[]</mermaid>'
);
expect( command.isEnabled ).to.be.true;
} );
it( 'when mermaid is selected', () => {
setModelData( model,
'<paragraph>foo</paragraph>' +
'[<mermaid source="flowchart TB\nA --> B\nB --> C"></mermaid>]'
);
expect( command.isEnabled ).to.be.true;
} );
} );
} );
describe( 'execute()', () => {
it( 'should add text', () => {
setModelData( model,
'[<mermaid displayMode="preview" source="foo"></mermaid>]'
);
command.execute();
expect( getModelData( model ) ).to.equal(
'[<mermaid displayMode="source" source="foo"></mermaid>]'
);
} );
} );
} );

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import { ClassicEditor } from '@ckeditor/ckeditor5-editor-classic';
import { Paragraph } from '@ckeditor/ckeditor5-paragraph';
import {
_setModelData as setModelData,
_getModelData as getModelData
} from '@ckeditor/ckeditor5-engine';
import MermaidSplitViewCommand from '../../src/commands/mermaidSplitViewCommand.js';
import MermaidEditing from '../../src/mermaidediting.js';
/* global document */
describe( 'MermaidSplitViewCommand', () => {
let domElement, editor, model, command;
beforeEach( async () => {
domElement = document.createElement( 'div' );
document.body.appendChild( domElement );
editor = await ClassicEditor.create( domElement, {
plugins: [
MermaidEditing,
Paragraph
]
} );
model = editor.model;
command = new MermaidSplitViewCommand( editor );
} );
afterEach( () => {
domElement.remove();
return editor.destroy();
} );
describe( '#value', () => {
it( 'should be true when mermaid element has displayMode attribute equal to "preview"', () => {
setModelData( model, '<mermaid displayMode="preview" source="foo"></mermaid>' );
expect( command.value ).to.equal( false );
} );
it( 'should be false when mermaid element has displayMode attribute equal to "split"', () => {
setModelData( model, '<mermaid displayMode="split" source="foo"></mermaid>' );
expect( command.value ).to.equal( true );
} );
it( 'should be false when mermaid element has source attribute equal to "source"', () => {
setModelData( model, '<mermaid displayMode="source" source="foo"></mermaid>' );
expect( command.value ).to.equal( false );
} );
} );
describe( '#isEnabled', () => {
describe( 'should be false', () => {
it( 'when text is selected', () => {
setModelData( model,
'<paragraph>[foo]</paragraph>' +
'<mermaid source="flowchart TB\nA --> B\nB --> C"></mermaid>'
);
expect( command.isEnabled ).to.be.false;
} );
it( 'when mermaid is part of the selection', () => {
setModelData( model,
'<paragraph>[foo</paragraph>' +
'<mermaid source="flowchart TB\nA --> B\nB --> C"></mermaid>' +
'<paragraph>b]az</paragraph>'
);
expect( command.isEnabled ).to.be.false;
} );
} );
describe( 'should be true', () => {
it( 'when selection is inside mermaid', () => {
setModelData( model,
'<paragraph>foo</paragraph>' +
'<mermaid source="flowchart TB\nA --> B\nB --> C">[]</mermaid>'
);
expect( command.isEnabled ).to.be.true;
} );
it( 'when mermaid is selected', () => {
setModelData( model,
'<paragraph>foo</paragraph>' +
'[<mermaid source="flowchart TB\nA --> B\nB --> C"></mermaid>]'
);
expect( command.isEnabled ).to.be.true;
} );
} );
} );
describe( 'execute()', () => {
it( 'should change displayMode to "source" for mermaid', () => {
setModelData( model,
'[<mermaid displayMode="source" source="foo"></mermaid>]'
);
command.execute();
expect( getModelData( model ) ).to.equal(
'[<mermaid displayMode="split" source="foo"></mermaid>]'
);
} );
} );
} );

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import { Mermaid as MermaidDll, icons } from '../src/index.js';
import Mermaid from '../src/mermaid.js';
import infoIcon from './../theme/icons/info.svg';
import insertMermaidIcon from './../theme/icons/insert.svg';
import previewModeIcon from './../theme/icons/preview-mode.svg';
import splitModeIcon from './../theme/icons/split-mode.svg';
import sourceModeIcon from './../theme/icons/source-mode.svg';
describe( 'CKEditor5 Mermaid DLL', () => {
it( 'exports MermaidWidget', () => {
expect( MermaidDll ).to.equal( Mermaid );
} );
describe( 'icons', () => {
it( 'exports the "insertMermaidIcon" icon', () => {
expect( icons.insertMermaidIcon ).to.equal( insertMermaidIcon );
} );
it( 'exports the "infoIcon" icon', () => {
expect( icons.infoIcon ).to.equal( infoIcon );
} );
it( 'exports the "previewModeIcon" icon', () => {
expect( icons.previewModeIcon ).to.equal( previewModeIcon );
} );
it( 'exports the "splitModeIcon" icon', () => {
expect( icons.splitModeIcon ).to.equal( splitModeIcon );
} );
it( 'exports the "sourceModeIcon" icon', () => {
expect( icons.sourceModeIcon ).to.equal( sourceModeIcon );
} );
} );
} );

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<style type="text/css">
#editor, .ck-editor {
/* Adjust width to the typical width in GH. */
width: 820px !important;
}
pre.markdown-output {
background: hsl(70, 7%, 16%);
color: hsl(0, 0%, 100%);
display: block;
font-size: 1em;
font-family: Monaco, Menlo, Consolas, "Roboto Mono", "Courier New", "Ubuntu Mono", monospace;
padding: 1.333em;
}
.editor-container {
display:flex;
}
.output-container {
padding-left: 20px;
}
</style>
<div class="editor-container">
<textarea id="editor">
Mermaid snippet:
```mermaid
flowchart TB
A --> C
A --> D
B --> C
B --> D
```
More complex case:
```mermaid
sequenceDiagram
participant Alice
participant Bob
Alice->>John: Hello John, how are you?
loop Healthcheck
John->>John: Fight against hypochondria
end
Note right of John: Rational thoughts <br/>prevail!
John-->>Alice: Great!
John->>Bob: How about you?
Bob-->>John: Jolly good!
```
Javascript snippet:
```Javascript
var foo = 'bar';
alert( foo );
```
</textarea>
<div class="output-container">
<p>Output:</p>
<pre class="markdown-output"><code id="markdown-output"></code></pre>
</div>
</div>

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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
*/
/* globals console, window, document */
import { ClassicEditor } from '@ckeditor/ckeditor5-editor-classic';
import { Typing } from '@ckeditor/ckeditor5-typing';
import { Paragraph } from '@ckeditor/ckeditor5-paragraph';
import { Undo } from '@ckeditor/ckeditor5-undo';
import { Enter } from '@ckeditor/ckeditor5-enter';
import { Clipboard } from '@ckeditor/ckeditor5-clipboard';
import { Link } from '@ckeditor/ckeditor5-link';
import { Bold, Italic } from '@ckeditor/ckeditor5-basic-styles';
import { Markdown } from '@ckeditor/ckeditor5-markdown-gfm';
import { CodeBlock } from '@ckeditor/ckeditor5-code-block';
import Mermaid from '../../src/mermaid.js';
ClassicEditor
.create( document.querySelector( '#editor' ), {
plugins: [
Markdown,
Typing,
Paragraph,
Undo,
Enter,
Clipboard,
Link,
Bold,
Italic,
CodeBlock,
Mermaid
],
toolbar: [ 'bold', 'italic', 'link', 'undo', 'redo', 'codeBlock', 'mermaid' ],
codeBlock: {
languages: [
{ language: 'plaintext', label: 'Plain text', class: '' },
{ language: 'javascript', label: 'JavaScript' },
{ language: 'python', label: 'Python' },
{ language: 'mermaid', label: 'Mermaid' }
]
}
} )
.then( editor => {
window.editor = editor;
setupMarkdownOutputPreview( editor );
} )
.catch( err => {
console.error( err.stack );
} );
function setupMarkdownOutputPreview( editor ) {
const outputElement = document.querySelector( '#markdown-output' );
editor.model.document.on( 'change', () => {
outputElement.innerText = editor.getData();
} );
// Set the initial data with delay so hightlight.js doesn't catch them.
window.setTimeout( () => {
outputElement.innerText = editor.getData();
}, 500 );
}

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## Mermaid widget

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<style type="text/css">
#editor, .ck-editor {
/* Adjust width to the typical width in GH. */
width: 820px !important;
}
</style>
<div id="editor">
<p>Mermaid snippet:</p>
<pre>
<code class="mermaid language-mermaid">
flowchart TB
A --> C
A --> D
B --> C
B --> D
</code>
</pre>
<p>More complex case:</p>
<pre>
<code class="mermaid language-mermaid">
sequenceDiagram
participant Alice
participant Bob
Alice->>John: Hello John, how are you?
loop Healthcheck
John->>John: Fight against hypochondria
end
Note right of John: Rational thoughts <br/>prevail!
John-->>Alice: Great!
John->>Bob: How about you?
Bob-->>John: Jolly good!
</code>
</pre>
</div>

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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
*/
/* globals console, window, document */
import { ClassicEditor } from '@ckeditor/ckeditor5-editor-classic';
import { Typing } from '@ckeditor/ckeditor5-typing';
import { Paragraph } from '@ckeditor/ckeditor5-paragraph';
import { Undo } from '@ckeditor/ckeditor5-undo';
import { Enter } from '@ckeditor/ckeditor5-enter';
import { Clipboard } from '@ckeditor/ckeditor5-clipboard';
import { Link } from '@ckeditor/ckeditor5-link';
import { Bold, Italic } from '@ckeditor/ckeditor5-basic-styles';
import { CodeBlock } from '@ckeditor/ckeditor5-code-block';
import Mermaid from '../../src/mermaid.js';
ClassicEditor
.create( document.querySelector( '#editor' ), {
plugins: [
Typing,
Paragraph,
Undo,
Enter,
Clipboard,
Link,
Bold,
Italic,
CodeBlock,
Mermaid
],
toolbar: [ 'bold', 'italic', 'link', 'undo', 'redo', 'codeBlock', 'mermaid' ],
codeBlock: {
languages: [
{ language: 'plaintext', label: 'Plain text', class: '' },
{ language: 'javascript', label: 'JavaScript' },
{ language: 'python', label: 'Python' },
{ language: 'mermaid', label: 'Mermaid' }
]
}
} )
.then( editor => {
window.editor = editor;
} )
.catch( err => {
console.error( err.stack );
} );

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## Mermaid widget

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import { ClassicEditor } from '@ckeditor/ckeditor5-editor-classic';
import { Essentials } from '@ckeditor/ckeditor5-essentials';
import { Paragraph } from '@ckeditor/ckeditor5-paragraph';
import { Heading } from '@ckeditor/ckeditor5-heading';
import { _setModelData as setModelData } from '@ckeditor/ckeditor5-engine';
import Mermaid from '../src/mermaid.js';
/* global document */
describe( 'Mermaid', () => {
it( 'should be named', () => {
expect( Mermaid.pluginName ).to.equal( 'Mermaid' );
} );
describe( 'init()', () => {
let domElement, editor;
beforeEach( async () => {
domElement = document.createElement( 'div' );
document.body.appendChild( domElement );
editor = await ClassicEditor.create( domElement, {
plugins: [
Paragraph,
Heading,
Essentials,
Mermaid
],
toolbar: [
'mermaid'
]
} );
setModelData( editor.model, '<paragraph>[]</paragraph>' );
} );
afterEach( () => {
domElement.remove();
return editor.destroy();
} );
it( 'should add an icon to the toolbar', () => {
expect( editor.ui.componentFactory.has( 'Mermaid' ) ).to.equal( true );
} );
} );
} );

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import { ClassicEditor } from '@ckeditor/ckeditor5-editor-classic';
import { Essentials } from '@ckeditor/ckeditor5-essentials';
import { Paragraph } from '@ckeditor/ckeditor5-paragraph';
import { Heading } from '@ckeditor/ckeditor5-heading';
import { CodeBlockEditing } from '@ckeditor/ckeditor5-code-block';
import {
_setModelData as setModelData,
_getModelData as getModelData,
_getViewData as getViewData
} from '@ckeditor/ckeditor5-engine';
import MermaidEditing from '../src/mermaidediting.js';
/* global document */
describe( 'MermaidEditing', () => {
it( 'should be named', () => {
expect( MermaidEditing.pluginName ).to.equal( 'MermaidEditing' );
} );
describe( 'conversion', () => {
let domElement, editor, model;
beforeEach( async () => {
domElement = document.createElement( 'div' );
document.body.appendChild( domElement );
editor = await ClassicEditor.create( domElement, {
plugins: [
Paragraph,
Heading,
Essentials,
CodeBlockEditing,
MermaidEditing
]
} );
model = editor.model;
} );
afterEach( () => {
domElement.remove();
return editor.destroy();
} );
describe( 'conversion', () => {
describe( 'upcast', () => {
it( 'works correctly', () => {
editor.setData(
'<pre spellcheck="false">' +
'<code class="language-mermaid">flowchart TB\nA --> B\nB --> C</code>' +
'</pre>'
);
expect( getModelData( model, { withoutSelection: true } ) ).to.equal(
'<mermaid displayMode="split" source="flowchart TB\nA --> B\nB --> C">' +
'</mermaid>'
);
} );
it( 'works correctly when empty', () => {
editor.setData(
'<pre spellcheck="false">' +
'<code class="language-mermaid"></code>' +
'</pre>'
);
expect( getModelData( model, { withoutSelection: true } ) ).to.equal(
'<mermaid displayMode="split" source=""></mermaid>'
);
} );
} );
describe( 'data downcast', () => {
it( 'works correctly', () => {
// Using editor.setData() instead of setModelData helper because of #11365.
editor.setData(
'<pre spellcheck="false">' +
'<code class="language-mermaid">flowchart TB\nA --> B\nB --> C</code>' +
'</pre>'
);
expect( editor.getData() ).to.equal(
'<pre spellcheck="false">' +
'<code class="language-mermaid">flowchart TB\nA --&gt; B\nB --&gt; C</code>' +
'</pre>'
);
} );
it( 'works correctly when empty ', () => {
// Using editor.setData() instead of setModelData helper because of #11365.
editor.setData(
'<pre spellcheck="false">' +
'<code class="language-mermaid"></code>' +
'</pre>'
);
expect( editor.getData() ).to.equal(
'<pre spellcheck="false">' +
'<code class="language-mermaid"></code>' +
'</pre>'
);
} );
} );
describe( 'editing downcast', () => {
it( 'works correctly without displayMode attribute', () => {
// Using editor.setData() instead of setModelData helper because of #11365.
editor.setData(
'<pre spellcheck="false">' +
'<code class="language-mermaid">flowchart TB\nA --> B\nB --> C</code>' +
'</pre>'
);
expect( getViewData( editor.editing.view, { withoutSelection: true } ) ).to.equal(
'<div class="ck-mermaid__split-mode ck-mermaid__wrapper ck-widget ck-widget_selected' +
' ck-widget_with-selection-handle" contenteditable="false">' +
'<div class="ck ck-widget__selection-handle"></div>' +
// New lines replaced with space, same issue in getViewData as in #11365.
'<textarea class="ck-mermaid__editing-view" data-cke-ignore-events="true"' +
' placeholder="Insert mermaid source code"></textarea>' +
'<div class="ck-mermaid__preview"></div>' +
'<div class="ck ck-reset_all ck-widget__type-around"></div>' +
'</div>'
);
} );
it( 'works correctly with displayMode attribute', () => {
setModelData( editor.model,
'<mermaid source="foo" displayMode="preview"></mermaid>'
);
expect( getViewData( editor.editing.view, { withoutSelection: true } ) ).to.equal(
'<div class="ck-mermaid__preview-mode ck-mermaid__wrapper ck-widget ck-widget_selected ' +
'ck-widget_with-selection-handle" contenteditable="false">' +
'<div class="ck ck-widget__selection-handle"></div>' +
'<textarea class="ck-mermaid__editing-view" data-cke-ignore-events="true"' +
' placeholder="Insert mermaid source code"></textarea>' +
'<div class="ck-mermaid__preview"></div>' +
'<div class="ck ck-reset_all ck-widget__type-around"></div>' +
'</div>'
);
} );
it( 'works correctly with empty source', () => {
setModelData( editor.model,
'<mermaid source="" displayMode="preview"></mermaid>'
);
expect( getViewData( editor.editing.view, { withoutSelection: true } ) ).to.equal(
'<div class="ck-mermaid__preview-mode ck-mermaid__wrapper ck-widget ck-widget_selected ' +
'ck-widget_with-selection-handle" contenteditable="false">' +
'<div class="ck ck-widget__selection-handle"></div>' +
'<textarea class="ck-mermaid__editing-view" data-cke-ignore-events="true"' +
' placeholder="Insert mermaid source code"></textarea>' +
'<div class="ck-mermaid__preview"></div>' +
'<div class="ck ck-reset_all ck-widget__type-around"></div>' +
'</div>'
);
} );
describe( 'textarea value', () => {
let domTextarea = null;
beforeEach( () => {
// Using editor.setData() instead of setModelData helper because of #11365.
editor.setData(
'<pre spellcheck="false">' +
'<code class="language-mermaid">flowchart TB\nA --> B\nB --> C</code>' +
'</pre>'
);
const textareaView = editor.editing.view.document.getRoot().getChild( 0 ).getChild( 1 );
domTextarea = editor.editing.view.domConverter.viewToDom( textareaView );
} );
it( 'is properly set during the initial conversion', () => {
expect( domTextarea.value ).to.equal( 'flowchart TB\nA --> B\nB --> C' );
} );
it( 'is properly updated after model\'s attribute change', () => {
const { model } = editor;
const mermaidModel = model.document.getRoot().getChild( 0 );
model.change( writer => {
writer.setAttribute( 'source', 'abc', mermaidModel );
} );
expect( domTextarea.value ).to.equal( 'abc' );
} );
it( 'doesn\'t loop if model attribute changes to the same value', () => {
const { model } = editor;
const mermaidModel = model.document.getRoot().getChild( 0 );
model.change( writer => {
writer.setAttribute( 'source', 'flowchart TB\nA --> B\nB --> C', mermaidModel );
} );
expect( domTextarea.value ).to.equal( 'flowchart TB\nA --> B\nB --> C' );
} );
} );
describe( 'preview div', () => {
let domPreviewContainer, renderMermaidStub;
beforeEach( () => {
// Using editor.setData() instead of setModelData helper because of #11365.
editor.setData(
'<pre spellcheck="false">' +
'<code class="language-mermaid">flowchart TB\nA --> B\nB --> C</code>' +
'</pre>'
);
const previewContainerView = editor.editing.view.document.getRoot().getChild( 0 ).getChild( 2 );
domPreviewContainer = editor.editing.view.domConverter.viewToDom( previewContainerView );
renderMermaidStub = sinon.stub( editor.plugins.get( 'MermaidEditing' ), '_renderMermaid' );
} );
afterEach( () => {
renderMermaidStub.restore();
} );
it( 'has proper inner text set during the initial conversion', () => {
expect( domPreviewContainer.textContent ).to.equal( 'flowchart TB\nA --> B\nB --> C' );
} );
it( 'has proper inner text set after a model\'s attribute change', () => {
const { model } = editor;
const mermaidModel = model.document.getRoot().getChild( 0 );
model.change( writer => {
writer.setAttribute( 'source', 'abc', mermaidModel );
} );
expect( domPreviewContainer.textContent ).to.equal( 'abc' );
} );
it( 'calls mermaid render function after a model\'s attribute change', () => {
const { model } = editor;
const mermaidModel = model.document.getRoot().getChild( 0 );
model.change( writer => {
writer.setAttribute( 'source', 'abc', mermaidModel );
} );
expect( renderMermaidStub.callCount ).to.equal( 1 );
sinon.assert.calledWithExactly( renderMermaidStub, domPreviewContainer );
} );
} );
} );
it( 'adds a editing pipeline converter that has a precedence over code block', () => {
setModelData( editor.model, '<mermaid source="foo"></mermaid>' );
const firstViewChild = editor.editing.view.document.getRoot().getChild( 0 );
expect( firstViewChild.name ).to.equal( 'div' );
expect( firstViewChild.hasClass( 'ck-mermaid__wrapper' ), 'has ck-mermaid__wrapper class' ).to.be.true;
} );
it( 'does not convert code blocks other than mermaid language', () => {
setModelData( editor.model, '<codeBlock language="javascript">foo</codeBlock>' );
const firstViewChild = editor.editing.view.document.getRoot().getChild( 0 );
expect( firstViewChild.name ).not.to.equal( 'div' );
expect( firstViewChild.hasClass( 'ck-mermaid__wrapper' ), 'has ck-mermaid__wrapper class' ).to.be.false;
} );
it( 'adds a preview element', () => {
setModelData( editor.model, '<mermaid source="foo"></mermaid>' );
const widgetChildren = [ ...editor.editing.view.document.getRoot().getChild( 0 ).getChildren() ];
const previewView = widgetChildren.filter( item => item.name === 'div' && item.hasClass( 'ck-mermaid__preview' ) );
expect( previewView.length ).to.equal( 1 );
} );
it( 'adds an editing element', () => {
setModelData( editor.model, '<mermaid source="foo"></mermaid>' );
const widgetChildren = [ ...editor.editing.view.document.getRoot().getChild( 0 ).getChildren() ];
const previewView = widgetChildren.filter(
item => item.name === 'textarea' && item.hasClass( 'ck-mermaid__editing-view' )
);
expect( previewView.length ).to.equal( 1 );
} );
} );
} );
} );

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import { ClassicEditor as ClassicTestEditor } from '@ckeditor/ckeditor5-editor-classic';
import { Essentials } from '@ckeditor/ckeditor5-essentials';
import { Paragraph } from '@ckeditor/ckeditor5-paragraph';
import { WidgetToolbarRepository } from '@ckeditor/ckeditor5-widget';
import { _setModelData as setData } from '@ckeditor/ckeditor5-engine';
import Mermaid from '../src/mermaid.js';
/* global document */
describe( 'MermaidToolbar', () => {
let editor, domElement, widgetToolbarRepository, balloon, toolbar, model;
beforeEach( () => {
domElement = document.createElement( 'div' );
document.body.appendChild( domElement );
return ClassicTestEditor.create( domElement, {
plugins: [ Essentials, Paragraph, Mermaid ],
mermaid: {
toolbar: [ 'fake_button' ]
}
} ).then( newEditor => {
editor = newEditor;
model = newEditor.model;
widgetToolbarRepository = editor.plugins.get( WidgetToolbarRepository );
toolbar = widgetToolbarRepository._toolbarDefinitions.get( 'mermaidToolbar' ).view;
balloon = editor.plugins.get( 'ContextualBalloon' );
} );
} );
afterEach( () => {
domElement.remove();
return editor.destroy();
} );
describe( 'toolbar', () => {
it( 'should be initialized with expected buttons', () => {
editor.ui.focusTracker.isFocused = true;
setData( model, '<mermaid displayMode="split" source="">[]</mermaid>' );
expect( toolbar.items ).to.have.length( 5 );
expect( toolbar.items.get( 0 ).label ).to.equal( 'Source view' );
expect( toolbar.items.get( 1 ).label ).to.equal( 'Split view' );
expect( toolbar.items.get( 2 ).label ).to.equal( 'Preview' );
expect( toolbar.items.get( 4 ).label ).to.equal( 'Read more about Mermaid diagram syntax' );
} );
} );
describe( 'integration with the editor focus', () => {
it( 'should show the toolbar when the editor gains focus and the mermaid widget is selected', () => {
setData( model,
'[<mermaid source="flowchart TB\nA --> B\nB --> C"></mermaid>]'
);
expect( balloon.visibleView ).to.be.null;
// @todo: remove me
// expect( balloon.visibleView === null, 'balloon.visibleView === null' ).to.be.true;
editor.ui.focusTracker.isFocused = true;
expect( balloon.visibleView ).to.equal( toolbar );
// @todo: remove me
// expect( balloon.visibleView === toolbar, 'balloon.visibleView === toolbar' ).to.be.true;
} );
it( 'should hide the toolbar when the editor loses focus and the mermaid widget is selected', () => {
setData( model,
'[<mermaid source="flowchart TB\nA --> B\nB --> C"></mermaid>]'
);
editor.ui.focusTracker.isFocused = true;
expect( balloon.visibleView ).to.equal( toolbar );
editor.ui.focusTracker.isFocused = false;
expect( balloon.visibleView ).to.be.null;
} );
} );
describe( 'integration with the editor selection', () => {
beforeEach( () => {
editor.ui.focusTracker.isFocused = true;
} );
it( 'should show the toolbar on ui#update when the mermaid widget is selected', () => {
setData( model,
'<paragraph>[foo]</paragraph>' +
'<mermaid source="flowchart TB\nA --> B\nB --> C"></mermaid>'
);
expect( balloon.visibleView ).to.be.null;
editor.ui.fire( 'update' );
expect( balloon.visibleView ).to.be.null;
model.change( writer => {
// Set selection to the [<mermaid source="flowchart TB\nA --> B\nB --> C"></mermaid>]
writer.setSelection( model.document.getRoot().getChild( 1 ), 'on' );
} );
expect( balloon.visibleView ).to.equal( toolbar );
// Make sure successive change does not throw, e.g. attempting
// to insert the toolbar twice.
editor.ui.fire( 'update' );
expect( balloon.visibleView ).to.equal( toolbar );
} );
it( 'should hide the toolbar on ui#update if the mermaid widget is deselected', () => {
setData( model,
'<paragraph>foo</paragraph>' +
'[<mermaid source="flowchart TB\nA --> B\nB --> C"></mermaid>]'
);
expect( balloon.visibleView ).to.equal( toolbar );
model.change( writer => {
// Select the <paragraph>[foo]</paragraph>
writer.setSelection( model.document.getRoot().getChild( 0 ), 'in' );
} );
expect( balloon.visibleView ).to.be.null;
// Make sure successive change does not throw, e.g. attempting
// to remove the toolbar twice.
editor.ui.fire( 'update' );
expect( balloon.visibleView ).to.be.null;
} );
it( 'should not hide the toolbar on ui#update when the selection is being moved from one mermaid widget to another', () => {
setData( model,
'[<mermaid source="flowchart TB\nA --> B\nB --> C"></mermaid>]' +
'<mermaid source="flowchart TB\nA --> B\nB --> C"></mermaid>'
);
expect( balloon.visibleView ).to.equal( toolbar );
model.change( writer => {
// Set selection to the second <mermaid></mermaid>
writer.setSelection( model.document.selection.getSelectedElement().nextSibling, 'on' );
} );
expect( balloon.visibleView ).to.equal( toolbar );
// Make sure successive change does not throw, e.g. attempting
// to insert the toolbar twice.
editor.ui.fire( 'update' );
expect( balloon.visibleView ).to.equal( toolbar );
} );
} );
} );

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import { ClassicEditor } from '@ckeditor/ckeditor5-editor-classic';
import { _setModelData as setModelData } from '@ckeditor/ckeditor5-engine';
import Mermaid from '../src/mermaid.js';
import MermaidUI from '../src/mermaidui.js';
/* global document */
describe( 'MermaidUI', () => {
it( 'should be named', () => {
expect( MermaidUI.pluginName ).to.equal( 'MermaidUI' );
} );
describe( 'init()', () => {
let domElement, editor;
beforeEach( async () => {
domElement = document.createElement( 'div' );
document.body.appendChild( domElement );
editor = await ClassicEditor.create( domElement, {
plugins: [
Mermaid
]
} );
} );
afterEach( () => {
domElement.remove();
return editor.destroy();
} );
it( 'should register the UI item', () => {
expect( editor.ui.componentFactory.has( 'mermaid' ) ).to.equal( true );
} );
it( 'has the base properties', () => {
const button = editor.ui.componentFactory.create( 'mermaid' );
expect( button ).to.have.property( 'label', 'Insert Mermaid diagram' );
expect( button ).to.have.property( 'icon' );
expect( button ).to.have.property( 'tooltip', true );
} );
describe( 'UI components', () => {
for ( const buttonName of [
'mermaidPreview',
'mermaidSourceView',
'mermaidSplitView',
'mermaidInfo'
] ) {
it( `should register the ${ buttonName } button`, () => {
expect( editor.ui.componentFactory.has( buttonName ) ).to.equal( true );
} );
it( `should add the base properties for ${ buttonName } button`, () => {
const button = editor.ui.componentFactory.create( buttonName );
expect( button ).to.have.property( 'label' );
expect( button ).to.have.property( 'icon' );
expect( button ).to.have.property( 'tooltip', true );
} );
}
} );
it( 'should set focus inside textarea of a newly created mermaid', () => {
const button = editor.ui.componentFactory.create( 'mermaid' );
button.fire( 'execute' );
expect( document.activeElement.tagName ).to.equal( 'TEXTAREA' );
} );
it( 'should not crash if the button is fired inside model.change()', () => {
const button = editor.ui.componentFactory.create( 'mermaid' );
setModelData( editor.model, '[]' );
editor.model.change( () => {
button.fire( 'execute' );
} );
// As the conversion is to be executed after the model.change(), we don't have access to the fully prepared view and
// despite that, we should still successfully add mermaid widget to the editor, not requiring the selection change
// to the inside of the nonexisting textarea element.
} );
} );
} );

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<svg width="16" height="16" viewBox="0 0 16 16" xmlns="http://www.w3.org/2000/svg"><path d="M8 1.219C4.254 1.219 1.219 4.28 1.219 8A6.78 6.78 0 0 0 8 14.781c3.719 0 6.781-3.035 6.781-6.781 0-3.719-3.062-6.781-6.781-6.781Zm0 12.25A5.45 5.45 0 0 1 2.531 8 5.467 5.467 0 0 1 8 2.531c3.008 0 5.469 2.461 5.469 5.469A5.467 5.467 0 0 1 8 13.469Zm0-9.242c-.656 0-1.148.52-1.148 1.148 0 .656.492 1.148 1.148 1.148.629 0 1.148-.492 1.148-1.148 0-.629-.52-1.148-1.148-1.148Zm1.531 6.945v-.656a.353.353 0 0 0-.328-.329h-.328V7.454a.353.353 0 0 0-.328-.328h-1.75a.332.332 0 0 0-.328.328v.656c0 .192.136.329.328.329h.328v1.75h-.328a.333.333 0 0 0-.328.328v.656c0 .191.136.328.328.328h2.406a.332.332 0 0 0 .328-.328Z"/></svg>

After

Width:  |  Height:  |  Size: 712 B

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/* Mermaid wrapper */
.ck-mermaid__wrapper {
display: flex;
justify-content: center;
}
/* Editing
Assigned to textarea
*/
.ck-mermaid__wrapper .ck-mermaid__editing-view {
padding: 16px; /* just like pre element */
background-color: hsla(0, 0%, 78%, 0.3); /* just like pre element */
min-height: 200px;
border: 0;
resize: vertical;
font-size: 12px; /* just like pre element */
outline: 0; /* just like pre element */
}
/* Preview */
.ck-mermaid__preview {
display: flex;
justify-content: center;
}
/* Preview error state */
[id^="dmermaid-"] {
display: flex;
align-items: center;
height: 100%;
justify-content: center;
}
[id^="dmermaid-"] svg {
display: block;
width: 60%;
height: auto;
}
/* Source mode */
.ck-mermaid__source-mode .ck-mermaid__editing-view {
width: 100%;
}
.ck-mermaid__source-mode .ck-mermaid__preview {
display: none;
}
/* Split mode */
.ck-mermaid__split-mode .ck-mermaid__editing-view {
width: 50%;
}
.ck-mermaid__split-mode .ck-mermaid__preview {
width: 50%;
}
/* Preview mode */
.ck-mermaid__preview-mode .ck-mermaid__editing-view {
display: none;
}