@ckeditor/ckeditor5-core/dist/index.js

/**
 * @license Copyright (c) 2003-2024, CKSource Holding sp. z o.o. All rights reserved.
 * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license
 */
import { ObservableMixin, insertToPriorityArray, EmitterMixin, CKEditorError, Config, Locale, Collection, KeystrokeHandler, setDataInElement } from '@ckeditor/ckeditor5-utils/dist/index.js';
import { Model, StylesProcessor, DataController, EditingController, Conversion } from '@ckeditor/ckeditor5-engine/dist/index.js';
import { isFunction } from 'lodash-es';

class Plugin extends ObservableMixin() {
    /**
     * Disables the plugin.
     *
     * Plugin may be disabled by multiple features or algorithms (at once). When disabling a plugin, unique id should be passed
     * (e.g. feature name). The same identifier should be used when {@link #clearForceDisabled enabling back} the plugin.
     * The plugin becomes enabled only after all features {@link #clearForceDisabled enabled it back}.
     *
     * Disabling and enabling a plugin:
     *
     * ```ts
     * plugin.isEnabled; // -> true
     * plugin.forceDisabled( 'MyFeature' );
     * plugin.isEnabled; // -> false
     * plugin.clearForceDisabled( 'MyFeature' );
     * plugin.isEnabled; // -> true
     * ```
     *
     * Plugin disabled by multiple features:
     *
     * ```ts
     * plugin.forceDisabled( 'MyFeature' );
     * plugin.forceDisabled( 'OtherFeature' );
     * plugin.clearForceDisabled( 'MyFeature' );
     * plugin.isEnabled; // -> false
     * plugin.clearForceDisabled( 'OtherFeature' );
     * plugin.isEnabled; // -> true
     * ```
     *
     * Multiple disabling with the same identifier is redundant:
     *
     * ```ts
     * plugin.forceDisabled( 'MyFeature' );
     * plugin.forceDisabled( 'MyFeature' );
     * plugin.clearForceDisabled( 'MyFeature' );
     * plugin.isEnabled; // -> true
     * ```
     *
     * **Note:** some plugins or algorithms may have more complex logic when it comes to enabling or disabling certain plugins,
     * so the plugin might be still disabled after {@link #clearForceDisabled} was used.
     *
     * @param id Unique identifier for disabling. Use the same id when {@link #clearForceDisabled enabling back} the plugin.
     */ forceDisabled(id) {
        this._disableStack.add(id);
        if (this._disableStack.size == 1) {
            this.on('set:isEnabled', forceDisable$1, {
                priority: 'highest'
            });
            this.isEnabled = false;
        }
    }
    /**
     * Clears forced disable previously set through {@link #forceDisabled}. See {@link #forceDisabled}.
     *
     * @param id Unique identifier, equal to the one passed in {@link #forceDisabled} call.
     */ clearForceDisabled(id) {
        this._disableStack.delete(id);
        if (this._disableStack.size == 0) {
            this.off('set:isEnabled', forceDisable$1);
            this.isEnabled = true;
        }
    }
    /**
     * @inheritDoc
     */ destroy() {
        this.stopListening();
    }
    /**
     * @inheritDoc
     */ static get isContextPlugin() {
        return false;
    }
    /**
     * @inheritDoc
     */ constructor(editor){
        super();
        /**
         * Holds identifiers for {@link #forceDisabled} mechanism.
         */ this._disableStack = new Set();
        this.editor = editor;
        this.set('isEnabled', true);
    }
}
/**
 * Helper function that forces plugin to be disabled.
 */ function forceDisable$1(evt) {
    evt.return = false;
    evt.stop();
}

class Command extends ObservableMixin() {
    /**
     * A flag indicating whether a command execution changes the editor data or not.
     *
     * Commands with `affectsData` set to `false` will not be automatically disabled in
     * the {@link module:core/editor/editor~Editor#isReadOnly read-only mode} and
     * {@glink features/read-only#related-features other editor modes} with restricted user write permissions.
     *
     * **Note:** You do not have to set it for your every command. It is `true` by default.
     *
     * @default true
     */ get affectsData() {
        return this._affectsData;
    }
    set affectsData(affectsData) {
        this._affectsData = affectsData;
    }
    /**
     * Refreshes the command. The command should update its {@link #isEnabled} and {@link #value} properties
     * in this method.
     *
     * This method is automatically called when
     * {@link module:engine/model/document~Document#event:change any changes are applied to the document}.
     */ refresh() {
        this.isEnabled = true;
    }
    /**
     * Disables the command.
     *
     * Command may be disabled by multiple features or algorithms (at once). When disabling a command, unique id should be passed
     * (e.g. the feature name). The same identifier should be used when {@link #clearForceDisabled enabling back} the command.
     * The command becomes enabled only after all features {@link #clearForceDisabled enabled it back}.
     *
     * Disabling and enabling a command:
     *
     * ```ts
     * command.isEnabled; // -> true
     * command.forceDisabled( 'MyFeature' );
     * command.isEnabled; // -> false
     * command.clearForceDisabled( 'MyFeature' );
     * command.isEnabled; // -> true
     * ```
     *
     * Command disabled by multiple features:
     *
     * ```ts
     * command.forceDisabled( 'MyFeature' );
     * command.forceDisabled( 'OtherFeature' );
     * command.clearForceDisabled( 'MyFeature' );
     * command.isEnabled; // -> false
     * command.clearForceDisabled( 'OtherFeature' );
     * command.isEnabled; // -> true
     * ```
     *
     * Multiple disabling with the same identifier is redundant:
     *
     * ```ts
     * command.forceDisabled( 'MyFeature' );
     * command.forceDisabled( 'MyFeature' );
     * command.clearForceDisabled( 'MyFeature' );
     * command.isEnabled; // -> true
     * ```
     *
     * **Note:** some commands or algorithms may have more complex logic when it comes to enabling or disabling certain commands,
     * so the command might be still disabled after {@link #clearForceDisabled} was used.
     *
     * @param id Unique identifier for disabling. Use the same id when {@link #clearForceDisabled enabling back} the command.
     */ forceDisabled(id) {
        this._disableStack.add(id);
        if (this._disableStack.size == 1) {
            this.on('set:isEnabled', forceDisable, {
                priority: 'highest'
            });
            this.isEnabled = false;
        }
    }
    /**
     * Clears forced disable previously set through {@link #forceDisabled}. See {@link #forceDisabled}.
     *
     * @param id Unique identifier, equal to the one passed in {@link #forceDisabled} call.
     */ clearForceDisabled(id) {
        this._disableStack.delete(id);
        if (this._disableStack.size == 0) {
            this.off('set:isEnabled', forceDisable);
            this.refresh();
        }
    }
    /**
     * Executes the command.
     *
     * A command may accept parameters. They will be passed from {@link module:core/editor/editor~Editor#execute `editor.execute()`}
     * to the command.
     *
     * The `execute()` method will automatically abort when the command is disabled ({@link #isEnabled} is `false`).
     * This behavior is implemented by a high priority listener to the {@link #event:execute} event.
     *
     * In order to see how to disable a command from "outside" see the {@link #isEnabled} documentation.
     *
     * This method may return a value, which would be forwarded all the way down to the
     * {@link module:core/editor/editor~Editor#execute `editor.execute()`}.
     *
     * @fires execute
     */ execute(...args) {
        return undefined;
    }
    /**
     * Destroys the command.
     */ destroy() {
        this.stopListening();
    }
    /**
     * Creates a new `Command` instance.
     *
     * @param editor The editor on which this command will be used.
     */ constructor(editor){
        super();
        this.editor = editor;
        this.set('value', undefined);
        this.set('isEnabled', false);
        this._affectsData = true;
        this._isEnabledBasedOnSelection = true;
        this._disableStack = new Set();
        this.decorate('execute');
        // By default, every command is refreshed when changes are applied to the model.
        this.listenTo(this.editor.model.document, 'change', ()=>{
            this.refresh();
        });
        this.listenTo(editor, 'change:isReadOnly', ()=>{
            this.refresh();
        });
        // By default, commands are disabled if the selection is in non-editable place or editor is in read-only mode.
        this.on('set:isEnabled', (evt)=>{
            if (!this.affectsData) {
                return;
            }
            const selection = editor.model.document.selection;
            const selectionInGraveyard = selection.getFirstPosition().root.rootName == '$graveyard';
            const canEditAtSelection = !selectionInGraveyard && editor.model.canEditAt(selection);
            // Disable if editor is read only, or when selection is in a place which cannot be edited.
            //
            // Checking `editor.isReadOnly` is needed for all commands that have `_isEnabledBasedOnSelection == false`.
            // E.g. undo does not base on selection, but affects data and should be disabled when the editor is in read-only mode.
            if (editor.isReadOnly || this._isEnabledBasedOnSelection && !canEditAtSelection) {
                evt.return = false;
                evt.stop();
            }
        }, {
            priority: 'highest'
        });
        this.on('execute', (evt)=>{
            if (!this.isEnabled) {
                evt.stop();
            }
        }, {
            priority: 'high'
        });
    }
}
/**
 * Helper function that forces command to be disabled.
 */ function forceDisable(evt) {
    evt.return = false;
    evt.stop();
}

class MultiCommand extends Command {
    /**
     * @inheritDoc
     */ refresh() {
    // Override base command refresh(): the command's state is changed when one of child commands changes states.
    }
    /**
     * Executes the first enabled command which has the highest priority of all registered child commands.
     *
     * @returns The value returned by the {@link module:core/command~Command#execute `command.execute()`}.
     */ execute(...args) {
        const command = this._getFirstEnabledCommand();
        return !!command && command.execute(args);
    }
    /**
     * Registers a child command.
     *
     * @param options An object with configuration options.
     * @param options.priority Priority of a command to register.
     */ registerChildCommand(command, options = {}) {
        insertToPriorityArray(this._childCommandsDefinitions, {
            command,
            priority: options.priority || 'normal'
        });
        // Change multi-command enabled state when one of registered commands changes state.
        command.on('change:isEnabled', ()=>this._checkEnabled());
        this._checkEnabled();
    }
    /**
     * Checks if any of child commands is enabled.
     */ _checkEnabled() {
        this.isEnabled = !!this._getFirstEnabledCommand();
    }
    /**
     * Returns a first enabled command with the highest priority or `undefined` if none of them is enabled.
     */ _getFirstEnabledCommand() {
        const commandDefinition = this._childCommandsDefinitions.find(({ command })=>command.isEnabled);
        return commandDefinition && commandDefinition.command;
    }
    constructor(){
        super(...arguments);
        /**
         * Registered child commands definitions.
         */ this._childCommandsDefinitions = [];
    }
}

class PluginCollection extends EmitterMixin() {
    /**
     * Iterable interface.
     *
     * Returns `[ PluginConstructor, pluginInstance ]` pairs.
     */ *[Symbol.iterator]() {
        for (const entry of this._plugins){
            if (typeof entry[0] == 'function') {
                yield entry;
            }
        }
    }
    /**
     * Gets the plugin instance by its constructor or name.
     *
     * ```ts
     * // Check if 'Clipboard' plugin was loaded.
     * if ( editor.plugins.has( 'ClipboardPipeline' ) ) {
     * 	// Get clipboard plugin instance
     * 	const clipboard = editor.plugins.get( 'ClipboardPipeline' );
     *
     * 	this.listenTo( clipboard, 'inputTransformation', ( evt, data ) => {
     * 		// Do something on clipboard input.
     * 	} );
     * }
     * ```
     *
     * **Note**: This method will throw an error if a plugin is not loaded. Use `{@link #has editor.plugins.has()}`
     * to check if a plugin is available.
     *
     * @param key The plugin constructor or {@link module:core/plugin~PluginStaticMembers#pluginName name}.
     */ get(key) {
        const plugin = this._plugins.get(key);
        if (!plugin) {
            let pluginName = key;
            if (typeof key == 'function') {
                pluginName = key.pluginName || key.name;
            }
            /**
             * The plugin is not loaded and could not be obtained.
             *
             * Plugin classes (constructors) need to be provided to the editor and must be loaded before they can be obtained from
             * the plugin collection.
             * This is usually done in CKEditor 5 builds by setting the {@link module:core/editor/editor~Editor.builtinPlugins}
             * property.
             *
             * **Note**: You can use `{@link module:core/plugincollection~PluginCollection#has editor.plugins.has()}`
             * to check if a plugin was loaded.
             *
             * @error plugincollection-plugin-not-loaded
             * @param plugin The name of the plugin which is not loaded.
             */ throw new CKEditorError('plugincollection-plugin-not-loaded', this._context, {
                plugin: pluginName
            });
        }
        return plugin;
    }
    /**
     * Checks if a plugin is loaded.
     *
     * ```ts
     * // Check if the 'Clipboard' plugin was loaded.
     * if ( editor.plugins.has( 'ClipboardPipeline' ) ) {
     * 	// Now use the clipboard plugin instance:
     * 	const clipboard = editor.plugins.get( 'ClipboardPipeline' );
     *
     * 	// ...
     * }
     * ```
     *
     * @param key The plugin constructor or {@link module:core/plugin~PluginStaticMembers#pluginName name}.
     */ has(key) {
        return this._plugins.has(key);
    }
    /**
     * Initializes a set of plugins and adds them to the collection.
     *
     * @param plugins An array of {@link module:core/plugin~PluginInterface plugin constructors}
     * or {@link module:core/plugin~PluginStaticMembers#pluginName plugin names}.
     * @param pluginsToRemove Names of the plugins or plugin constructors
     * that should not be loaded (despite being specified in the `plugins` array).
     * @param pluginsSubstitutions An array of {@link module:core/plugin~PluginInterface plugin constructors}
     * that will be used to replace plugins of the same names that were passed in `plugins` or that are in their dependency tree.
     * A useful option for replacing built-in plugins while creating tests (for mocking their APIs). Plugins that will be replaced
     * must follow these rules:
     *   * The new plugin must be a class.
     *   * The new plugin must be named.
     *   * Both plugins must not depend on other plugins.
     * @returns A promise which gets resolved once all plugins are loaded and available in the collection.
     */ init(plugins, pluginsToRemove = [], pluginsSubstitutions = []) {
        // Plugin initialization procedure consists of 2 main steps:
        // 1) collecting all available plugin constructors,
        // 2) verification whether all required plugins can be instantiated.
        //
        // In the first step, all plugin constructors, available in the provided `plugins` array and inside
        // plugin's dependencies (from the `Plugin.requires` array), are recursively collected and added to the existing
        // `this._availablePlugins` map, but without any verification at the given moment. Performing the verification
        // at this point (during the plugin constructor searching) would cause false errors to occur, that some plugin
        // is missing but in fact it may be defined further in the array as the dependency of other plugin. After
        // traversing the entire dependency tree, it will be checked if all required "top level" plugins are available.
        //
        // In the second step, the list of plugins that have not been explicitly removed is traversed to get all the
        // plugin constructors to be instantiated in the correct order and to validate against some rules. Finally, if
        // no plugin is missing and no other error has been found, they all will be instantiated.
        // eslint-disable-next-line @typescript-eslint/no-this-alias
        const that = this;
        const context = this._context;
        findAvailablePluginConstructors(plugins);
        validatePlugins(plugins);
        const pluginsToLoad = plugins.filter((plugin)=>!isPluginRemoved(plugin, pluginsToRemove));
        const pluginConstructors = [
            ...getPluginConstructors(pluginsToLoad)
        ];
        substitutePlugins(pluginConstructors, pluginsSubstitutions);
        const pluginInstances = loadPlugins(pluginConstructors);
        return initPlugins(pluginInstances, 'init').then(()=>initPlugins(pluginInstances, 'afterInit')).then(()=>pluginInstances);
        function isPluginConstructor(plugin) {
            return typeof plugin === 'function';
        }
        function isContextPlugin(plugin) {
            return isPluginConstructor(plugin) && !!plugin.isContextPlugin;
        }
        function isPluginRemoved(plugin, pluginsToRemove) {
            return pluginsToRemove.some((removedPlugin)=>{
                if (removedPlugin === plugin) {
                    return true;
                }
                if (getPluginName(plugin) === removedPlugin) {
                    return true;
                }
                if (getPluginName(removedPlugin) === plugin) {
                    return true;
                }
                return false;
            });
        }
        function getPluginName(plugin) {
            return isPluginConstructor(plugin) ? plugin.pluginName || plugin.name : plugin;
        }
        function findAvailablePluginConstructors(plugins, processed = new Set()) {
            plugins.forEach((plugin)=>{
                if (!isPluginConstructor(plugin)) {
                    return;
                }
                if (processed.has(plugin)) {
                    return;
                }
                processed.add(plugin);
                if (plugin.pluginName && !that._availablePlugins.has(plugin.pluginName)) {
                    that._availablePlugins.set(plugin.pluginName, plugin);
                }
                if (plugin.requires) {
                    findAvailablePluginConstructors(plugin.requires, processed);
                }
            });
        }
        function getPluginConstructors(plugins, processed = new Set()) {
            return plugins.map((plugin)=>{
                return isPluginConstructor(plugin) ? plugin : that._availablePlugins.get(plugin);
            }).reduce((result, plugin)=>{
                if (processed.has(plugin)) {
                    return result;
                }
                processed.add(plugin);
                if (plugin.requires) {
                    validatePlugins(plugin.requires, plugin);
                    getPluginConstructors(plugin.requires, processed).forEach((plugin)=>result.add(plugin));
                }
                return result.add(plugin);
            }, new Set());
        }
        function validatePlugins(plugins, parentPluginConstructor = null) {
            plugins.map((plugin)=>{
                return isPluginConstructor(plugin) ? plugin : that._availablePlugins.get(plugin) || plugin;
            }).forEach((plugin)=>{
                checkMissingPlugin(plugin, parentPluginConstructor);
                checkContextPlugin(plugin, parentPluginConstructor);
                checkRemovedPlugin(plugin, parentPluginConstructor);
            });
        }
        function checkMissingPlugin(plugin, parentPluginConstructor) {
            if (isPluginConstructor(plugin)) {
                return;
            }
            if (parentPluginConstructor) {
                /**
                 * A required "soft" dependency was not found on the plugin list.
                 *
                 * When configuring the editor, either prior to building (via
                 * {@link module:core/editor/editor~Editor.builtinPlugins `Editor.builtinPlugins`}) or when
                 * creating a new instance of the editor (e.g. via
                 * {@link module:core/editor/editorconfig~EditorConfig#plugins `config.plugins`}), you need to provide
                 * some of the dependencies for other plugins that you used.
                 *
                 * This error is thrown when one of these dependencies was not provided. The name of the missing plugin
                 * can be found in `missingPlugin` and the plugin that required it in `requiredBy`.
                 *
                 * In order to resolve it, you need to import the missing plugin and add it to the
                 * current list of plugins (`Editor.builtinPlugins` or `config.plugins`/`config.extraPlugins`).
                 *
                 * Soft requirements were introduced in version 26.0.0. If you happen to stumble upon this error
                 * when upgrading to version 26.0.0, read also the
                 * {@glink updating/guides/update-to-26 Migration to 26.0.0} guide.
                 *
                 * @error plugincollection-soft-required
                 * @param missingPlugin The name of the required plugin.
                 * @param requiredBy The name of the plugin that requires the other plugin.
                 */ throw new CKEditorError('plugincollection-soft-required', context, {
                    missingPlugin: plugin,
                    requiredBy: getPluginName(parentPluginConstructor)
                });
            }
            /**
             * A plugin is not available and could not be loaded.
             *
             * Plugin classes (constructors) need to be provided to the editor before they can be loaded by name.
             * This is usually done in CKEditor 5 builds by setting the {@link module:core/editor/editor~Editor.builtinPlugins}
             * property.
             *
             * **If you see this warning when using one of the {@glink installation/getting-started/predefined-builds
             * CKEditor 5 Builds}**,
             * it means that you try to enable a plugin which was not included in that build. This may be due to a typo
             * in the plugin name or simply because that plugin is not a part of this build. In the latter scenario,
             * read more about {@glink installation/getting-started/quick-start custom builds}.
             *
             * **If you see this warning when using one of the editor creators directly** (not a build), then it means
             * that you tried loading plugins by name. However, unlike CKEditor 4, CKEditor 5 does not implement a "plugin loader".
             * This means that CKEditor 5 does not know where to load the plugin modules from. Therefore, you need to
             * provide each plugin through a reference (as a constructor function). Check out the examples in
             * {@glink installation/advanced/alternative-setups/integrating-from-source-webpack "Building from source"}.
             *
             * @error plugincollection-plugin-not-found
             * @param plugin The name of the plugin which could not be loaded.
             */ throw new CKEditorError('plugincollection-plugin-not-found', context, {
                plugin
            });
        }
        function checkContextPlugin(plugin, parentPluginConstructor) {
            if (!isContextPlugin(parentPluginConstructor)) {
                return;
            }
            if (isContextPlugin(plugin)) {
                return;
            }
            /**
             * If a plugin is a context plugin, all plugins it requires should also be context plugins
             * instead of plugins. In other words, if one plugin can be used in the context,
             * all its requirements should also be ready to be used in the context. Note that the context
             * provides only a part of the API provided by the editor. If one plugin needs a full
             * editor API, all plugins which require it are considered as plugins that need a full
             * editor API.
             *
             * @error plugincollection-context-required
             * @param plugin The name of the required plugin.
             * @param requiredBy The name of the parent plugin.
             */ throw new CKEditorError('plugincollection-context-required', context, {
                plugin: getPluginName(plugin),
                requiredBy: getPluginName(parentPluginConstructor)
            });
        }
        function checkRemovedPlugin(plugin, parentPluginConstructor) {
            if (!parentPluginConstructor) {
                return;
            }
            if (!isPluginRemoved(plugin, pluginsToRemove)) {
                return;
            }
            /**
             * Cannot load a plugin because one of its dependencies is listed in the `removePlugins` option.
             *
             * @error plugincollection-required
             * @param plugin The name of the required plugin.
             * @param requiredBy The name of the parent plugin.
             */ throw new CKEditorError('plugincollection-required', context, {
                plugin: getPluginName(plugin),
                requiredBy: getPluginName(parentPluginConstructor)
            });
        }
        function loadPlugins(pluginConstructors) {
            return pluginConstructors.map((PluginConstructor)=>{
                let pluginInstance = that._contextPlugins.get(PluginConstructor);
                pluginInstance = pluginInstance || new PluginConstructor(context);
                that._add(PluginConstructor, pluginInstance);
                return pluginInstance;
            });
        }
        function initPlugins(pluginInstances, method) {
            return pluginInstances.reduce((promise, plugin)=>{
                if (!plugin[method]) {
                    return promise;
                }
                if (that._contextPlugins.has(plugin)) {
                    return promise;
                }
                return promise.then(plugin[method].bind(plugin));
            }, Promise.resolve());
        }
        /**
         * Replaces plugin constructors with the specified set of plugins.
         */ function substitutePlugins(pluginConstructors, pluginsSubstitutions) {
            for (const pluginItem of pluginsSubstitutions){
                if (typeof pluginItem != 'function') {
                    /**
                     * The plugin replacing an existing plugin must be a function.
                     *
                     * @error plugincollection-replace-plugin-invalid-type
                     */ throw new CKEditorError('plugincollection-replace-plugin-invalid-type', null, {
                        pluginItem
                    });
                }
                const pluginName = pluginItem.pluginName;
                if (!pluginName) {
                    /**
                     * The plugin replacing an existing plugin must have a name.
                     *
                     * @error plugincollection-replace-plugin-missing-name
                     */ throw new CKEditorError('plugincollection-replace-plugin-missing-name', null, {
                        pluginItem
                    });
                }
                if (pluginItem.requires && pluginItem.requires.length) {
                    /**
                     * The plugin replacing an existing plugin cannot depend on other plugins.
                     *
                     * @error plugincollection-plugin-for-replacing-cannot-have-dependencies
                     */ throw new CKEditorError('plugincollection-plugin-for-replacing-cannot-have-dependencies', null, {
                        pluginName
                    });
                }
                const pluginToReplace = that._availablePlugins.get(pluginName);
                if (!pluginToReplace) {
                    /**
                     * The replaced plugin does not exist in the
                     * {@link module:core/plugincollection~PluginCollection available plugins} collection.
                     *
                     * @error plugincollection-plugin-for-replacing-not-exist
                     */ throw new CKEditorError('plugincollection-plugin-for-replacing-not-exist', null, {
                        pluginName
                    });
                }
                const indexInPluginConstructors = pluginConstructors.indexOf(pluginToReplace);
                if (indexInPluginConstructors === -1) {
                    // The Context feature can substitute plugins as well.
                    // It may happen that the editor will be created with the given context, where the plugin for substitute
                    // was already replaced. In such a case, we don't want to do it again.
                    if (that._contextPlugins.has(pluginToReplace)) {
                        return;
                    }
                    /**
                     * The replaced plugin will not be loaded so it cannot be replaced.
                     *
                     * @error plugincollection-plugin-for-replacing-not-loaded
                     */ throw new CKEditorError('plugincollection-plugin-for-replacing-not-loaded', null, {
                        pluginName
                    });
                }
                if (pluginToReplace.requires && pluginToReplace.requires.length) {
                    /**
                     * The replaced plugin cannot depend on other plugins.
                     *
                     * @error plugincollection-replaced-plugin-cannot-have-dependencies
                     */ throw new CKEditorError('plugincollection-replaced-plugin-cannot-have-dependencies', null, {
                        pluginName
                    });
                }
                pluginConstructors.splice(indexInPluginConstructors, 1, pluginItem);
                that._availablePlugins.set(pluginName, pluginItem);
            }
        }
    }
    /**
     * Destroys all loaded plugins.
     */ destroy() {
        const promises = [];
        for (const [, pluginInstance] of this){
            if (typeof pluginInstance.destroy == 'function' && !this._contextPlugins.has(pluginInstance)) {
                promises.push(pluginInstance.destroy());
            }
        }
        return Promise.all(promises);
    }
    /**
     * Adds the plugin to the collection. Exposed mainly for testing purposes.
     *
     * @param PluginConstructor The plugin constructor.
     * @param plugin The instance of the plugin.
     */ _add(PluginConstructor, plugin) {
        this._plugins.set(PluginConstructor, plugin);
        const pluginName = PluginConstructor.pluginName;
        if (!pluginName) {
            return;
        }
        if (this._plugins.has(pluginName)) {
            /**
             * Two plugins with the same {@link module:core/plugin~PluginStaticMembers#pluginName} were loaded.
             * This will lead to runtime conflicts between these plugins.
             *
             * In practice, this warning usually means that new plugins were added to an existing CKEditor 5 build.
             * Plugins should always be added to a source version of the editor (`@ckeditor/ckeditor5-editor-*`),
             * not to an editor imported from one of the `@ckeditor/ckeditor5-build-*` packages.
             *
             * Check your import paths and the list of plugins passed to
             * {@link module:core/editor/editor~Editor.create `Editor.create()`}
             * or specified in {@link module:core/editor/editor~Editor.builtinPlugins `Editor.builtinPlugins`}.
             *
             * The second option is that your `node_modules/` directory contains duplicated versions of the same
             * CKEditor 5 packages. Normally, on clean installations, npm deduplicates packages in `node_modules/`, so
             * it may be enough to call `rm -rf node_modules && npm i`. However, if you installed conflicting versions
             * of some packages, their dependencies may need to be installed in more than one version which may lead to this
             * warning.
             *
             * Technically speaking, this error occurs because after adding a plugin to an existing editor build
             * the dependencies of this plugin are being duplicated.
             * They are already built into that editor build and now get added for the second time as dependencies
             * of the plugin you are installing.
             *
             * Read more about {@glink installation/plugins/installing-plugins Installing plugins}.
             *
             * @error plugincollection-plugin-name-conflict
             * @param pluginName The duplicated plugin name.
             * @param plugin1 The first plugin constructor.
             * @param plugin2 The second plugin constructor.
             */ throw new CKEditorError('plugincollection-plugin-name-conflict', null, {
                pluginName,
                plugin1: this._plugins.get(pluginName).constructor,
                plugin2: PluginConstructor
            });
        }
        this._plugins.set(pluginName, plugin);
    }
    /**
     * Creates an instance of the plugin collection class.
     * Allows loading and initializing plugins and their dependencies.
     * Allows providing a list of already loaded plugins. These plugins will not be destroyed along with this collection.
     *
     * @param availablePlugins Plugins (constructors) which the collection will be able to use
     * when {@link module:core/plugincollection~PluginCollection#init} is used with the plugin names (strings, instead of constructors).
     * Usually, the editor will pass its built-in plugins to the collection so they can later be
     * used in `config.plugins` or `config.removePlugins` by names.
     * @param contextPlugins A list of already initialized plugins represented by a `[ PluginConstructor, pluginInstance ]` pair.
     */ constructor(context, availablePlugins = [], contextPlugins = []){
        super();
        this._plugins = new Map();
        this._context = context;
        this._availablePlugins = new Map();
        for (const PluginConstructor of availablePlugins){
            if (PluginConstructor.pluginName) {
                this._availablePlugins.set(PluginConstructor.pluginName, PluginConstructor);
            }
        }
        this._contextPlugins = new Map();
        for (const [PluginConstructor, pluginInstance] of contextPlugins){
            this._contextPlugins.set(PluginConstructor, pluginInstance);
            this._contextPlugins.set(pluginInstance, PluginConstructor);
            // To make it possible to require a plugin by its name.
            if (PluginConstructor.pluginName) {
                this._availablePlugins.set(PluginConstructor.pluginName, PluginConstructor);
            }
        }
    }
}

class Context {
    /**
     * Loads and initializes plugins specified in the configuration.
     *
     * @returns A promise which resolves once the initialization is completed, providing an array of loaded plugins.
     */ initPlugins() {
        const plugins = this.config.get('plugins') || [];
        const substitutePlugins = this.config.get('substitutePlugins') || [];
        // Plugins for substitution should be checked as well.
        for (const Plugin of plugins.concat(substitutePlugins)){
            if (typeof Plugin != 'function') {
                /**
                 * Only a constructor function is allowed as a {@link module:core/contextplugin~ContextPlugin context plugin}.
                 *
                 * @error context-initplugins-constructor-only
                 */ throw new CKEditorError('context-initplugins-constructor-only', null, {
                    Plugin
                });
            }
            if (Plugin.isContextPlugin !== true) {
                /**
                 * Only a plugin marked as a {@link module:core/contextplugin~ContextPlugin.isContextPlugin context plugin}
                 * is allowed to be used with a context.
                 *
                 * @error context-initplugins-invalid-plugin
                 */ throw new CKEditorError('context-initplugins-invalid-plugin', null, {
                    Plugin
                });
            }
        }
        return this.plugins.init(plugins, [], substitutePlugins);
    }
    /**
     * Destroys the context instance and all editors used with the context,
     * releasing all resources used by the context.
     *
     * @returns A promise that resolves once the context instance is fully destroyed.
     */ destroy() {
        return Promise.all(Array.from(this.editors, (editor)=>editor.destroy())).then(()=>this.plugins.destroy());
    }
    /**
     * Adds a reference to the editor which is used with this context.
     *
     * When the given editor has created the context, the reference to this editor will be stored
     * as a {@link ~Context#_contextOwner}.
     *
     * This method should only be used by the editor.
     *
     * @internal
     * @param isContextOwner Stores the given editor as a context owner.
     */ _addEditor(editor, isContextOwner) {
        if (this._contextOwner) {
            /**
             * Cannot add multiple editors to the context which is created by the editor.
             *
             * @error context-addeditor-private-context
             */ throw new CKEditorError('context-addeditor-private-context');
        }
        this.editors.add(editor);
        if (isContextOwner) {
            this._contextOwner = editor;
        }
    }
    /**
     * Removes a reference to the editor which was used with this context.
     * When the context was created by the given editor, the context will be destroyed.
     *
     * This method should only be used by the editor.
     *
     * @internal
     * @return A promise that resolves once the editor is removed from the context or when the context was destroyed.
     */ _removeEditor(editor) {
        if (this.editors.has(editor)) {
            this.editors.remove(editor);
        }
        if (this._contextOwner === editor) {
            return this.destroy();
        }
        return Promise.resolve();
    }
    /**
     * Returns the context configuration which will be copied to the editors created using this context.
     *
     * The configuration returned by this method has the plugins configuration removed – plugins are shared with all editors
     * through another mechanism.
     *
     * This method should only be used by the editor.
     *
     * @internal
     * @returns Configuration as a plain object.
     */ _getEditorConfig() {
        const result = {};
        for (const name of this.config.names()){
            if (![
                'plugins',
                'removePlugins',
                'extraPlugins'
            ].includes(name)) {
                result[name] = this.config.get(name);
            }
        }
        return result;
    }
    /**
     * Creates and initializes a new context instance.
     *
     * ```ts
     * const commonConfig = { ... }; // Configuration for all the plugins and editors.
     * const editorPlugins = [ ... ]; // Regular plugins here.
     *
     * Context
     * 	.create( {
     * 		// Only context plugins here.
     * 		plugins: [ ... ],
     *
     * 		// Configure the language for all the editors (it cannot be overwritten).
     * 		language: { ... },
     *
     * 		// Configuration for context plugins.
     * 		comments: { ... },
     * 		...
     *
     * 		// Default configuration for editor plugins.
     * 		toolbar: { ... },
     * 		image: { ... },
     * 		...
     * 	} )
     * 	.then( context => {
     * 		const promises = [];
     *
     * 		promises.push( ClassicEditor.create(
     * 			document.getElementById( 'editor1' ),
     * 			{
     * 				editorPlugins,
     * 				context
     * 			}
     * 		) );
     *
     * 		promises.push( ClassicEditor.create(
     * 			document.getElementById( 'editor2' ),
     * 			{
     * 				editorPlugins,
     * 				context,
     * 				toolbar: { ... } // You can overwrite the configuration of the context.
     * 			}
     * 		) );
     *
     * 		return Promise.all( promises );
     * 	} );
     * ```
     *
     * @param config The context configuration.
     * @returns A promise resolved once the context is ready. The promise resolves with the created context instance.
     */ static create(config) {
        return new Promise((resolve)=>{
            const context = new this(config);
            resolve(context.initPlugins().then(()=>context));
        });
    }
    /**
     * Creates a context instance with a given configuration.
     *
     * Usually not to be used directly. See the static {@link module:core/context~Context.create `create()`} method.
     *
     * @param config The context configuration.
     */ constructor(config){
        /**
         * Reference to the editor which created the context.
         * Null when the context was created outside of the editor.
         *
         * It is used to destroy the context when removing the editor that has created the context.
         */ this._contextOwner = null;
        // We don't pass translations to the config, because its behavior of splitting keys
        // with dots (e.g. `resize.width` => `resize: { width }`) breaks the translations.
        const { translations, ...rest } = config || {};
        this.config = new Config(rest, this.constructor.defaultConfig);
        const availablePlugins = this.constructor.builtinPlugins;
        this.config.define('plugins', availablePlugins);
        this.plugins = new PluginCollection(this, availablePlugins);
        const languageConfig = this.config.get('language') || {};
        this.locale = new Locale({
            uiLanguage: typeof languageConfig === 'string' ? languageConfig : languageConfig.ui,
            contentLanguage: this.config.get('language.content'),
            translations
        });
        this.t = this.locale.t;
        this.editors = new Collection();
    }
}

class ContextPlugin extends ObservableMixin() {
    /**
     * @inheritDoc
     */ destroy() {
        this.stopListening();
    }
    /**
     * @inheritDoc
     */ static get isContextPlugin() {
        return true;
    }
    /**
     * Creates a new plugin instance.
     */ constructor(context){
        super();
        this.context = context;
    }
}

class CommandCollection {
    /**
     * Registers a new command.
     *
     * @param commandName The name of the command.
     */ add(commandName, command) {
        this._commands.set(commandName, command);
    }
    /**
     * Retrieves a command from the collection.
     *
     * @param commandName The name of the command.
     */ get(commandName) {
        return this._commands.get(commandName);
    }
    /**
     * Executes a command.
     *
     * @param commandName The name of the command.
     * @param commandParams Command parameters.
     * @returns The value returned by the {@link module:core/command~Command#execute `command.execute()`}.
     */ execute(commandName, ...commandParams) {
        const command = this.get(commandName);
        if (!command) {
            /**
             * Command does not exist.
             *
             * @error commandcollection-command-not-found
             * @param commandName Name of the command.
             */ throw new CKEditorError('commandcollection-command-not-found', this, {
                commandName
            });
        }
        return command.execute(...commandParams);
    }
    /**
     * Returns iterator of command names.
     */ *names() {
        yield* this._commands.keys();
    }
    /**
     * Returns iterator of command instances.
     */ *commands() {
        yield* this._commands.values();
    }
    /**
     * Iterable interface.
     *
     * Returns `[ commandName, commandInstance ]` pairs.
     */ [Symbol.iterator]() {
        return this._commands[Symbol.iterator]();
    }
    /**
     * Destroys all collection commands.
     */ destroy() {
        for (const command of this.commands()){
            command.destroy();
        }
    }
    /**
     * Creates collection instance.
     */ constructor(){
        this._commands = new Map();
    }
}

class EditingKeystrokeHandler extends KeystrokeHandler {
    /**
     * Registers a handler for the specified keystroke.
     *
     * The handler can be specified as a command name or a callback.
     *
     * @param keystroke Keystroke defined in a format accepted by
     * the {@link module:utils/keyboard~parseKeystroke} function.
     * @param callback If a string is passed, then the keystroke will
     * {@link module:core/editor/editor~Editor#execute execute a command}.
     * If a function, then it will be called with the
     * {@link module:engine/view/observer/keyobserver~KeyEventData key event data} object and
     * a `cancel()` helper to both `preventDefault()` and `stopPropagation()` of the event.
     * @param options Additional options.
     * @param options.priority The priority of the keystroke callback. The higher the priority value
     * the sooner the callback will be executed. Keystrokes having the same priority
     * are called in the order they were added.
     */ set(keystroke, callback, options = {}) {
        if (typeof callback == 'string') {
            const commandName = callback;
            callback = (evtData, cancel)=>{
                this.editor.execute(commandName);
                cancel();
            };
        }
        super.set(keystroke, callback, options);
    }
    /**
     * Creates an instance of the keystroke handler.
     */ constructor(editor){
        super();
        this.editor = editor;
    }
}

const DEFAULT_CATEGORY_ID = 'contentEditing';
const DEFAULT_GROUP_ID = 'common';
class Accessibility {
    /**
     * Adds a top-level category in the {@link #keystrokeInfos keystroke information database} with a label and optional description.
     *
     * Categories organize keystrokes and help users to find the right keystroke. Each category can have multiple groups
     * of keystrokes that narrow down the context in which the keystrokes are available. Every keystroke category comes
     * with a `'common'` group by default.
     *
     * By default, two categories are available:
     * * `'contentEditing'` for keystrokes related to content creation,
     * * `'navigation'` for keystrokes related to navigation in the UI and the content.
     *
     * To create a new keystroke category with new groups, use the following code:
     *
     * ```js
     * class MyPlugin extends Plugin {
     * 	// ...
     * 	init() {
     * 		const editor = this.editor;
     * 		const t = editor.t;
     *
     * 		// ...
     *
     * 		editor.accessibility.addKeystrokeInfoCategory( {
     * 			id: 'myCategory',
     * 			label: t( 'My category' ),
     * 			description: t( 'My category description.' ),
     * 			groups: [
     * 				{
     * 					id: 'myGroup',
     * 					label: t( 'My keystroke group' ),
     * 					keystrokes: [
     * 						{
     * 							label: t( 'Keystroke label 1' ),
     * 							keystroke: 'Ctrl+Shift+N'
     * 						},
     * 						{
     * 							label: t( 'Keystroke label 2' ),
     * 							keystroke: 'Ctrl+Shift+M'
     * 						}
     * 					]
     * 				}
     * 			]
     * 		};
     * 	}
     * }
     * ```
     *
     * See {@link #keystrokeInfos}, {@link #addKeystrokeInfoGroup}, and {@link #addKeystrokeInfos}.
     */ addKeystrokeInfoCategory({ id, label, description, groups }) {
        this.keystrokeInfos.set(id, {
            id,
            label,
            description,
            groups: new Map()
        });
        this.addKeystrokeInfoGroup({
            categoryId: id,
            id: DEFAULT_GROUP_ID
        });
        if (groups) {
            groups.forEach((group)=>{
                this.addKeystrokeInfoGroup({
                    categoryId: id,
                    ...group
                });
            });
        }
    }
    /**
     * Adds a group of keystrokes in a specific category to the {@link #keystrokeInfos keystroke information database}.
     *
     * Groups narrow down the context in which the keystrokes are available. When `categoryId` is not specified,
     * the group goes to the `'contentEditing'` category (default).
     *
     * To create a new group within an existing category, use the following code:
     *
     * ```js
     * class MyPlugin extends Plugin {
     * 	// ...
     * 	init() {
     * 		const editor = this.editor;
     * 		const t = editor.t;
     *
     * 		// ...
     *
     * 		editor.accessibility.addKeystrokeInfoGroup( {
     * 			id: 'myGroup',
     * 			categoryId: 'navigation',
     * 			label: t( 'My keystroke group' ),
     * 			keystrokes: [
     * 				{
     * 					label: t( 'Keystroke label 1' ),
     * 					keystroke: 'Ctrl+Shift+N'
     * 				},
     * 				{
     * 					label: t( 'Keystroke label 2' ),
     * 					keystroke: 'Ctrl+Shift+M'
     * 				}
     * 			]
     * 		} );
     * 	}
     * }
     * ```
     *
     * See {@link #keystrokeInfos}, {@link #addKeystrokeInfoCategory}, and {@link #addKeystrokeInfos}.
     */ addKeystrokeInfoGroup({ categoryId = DEFAULT_CATEGORY_ID, id, label, keystrokes }) {
        const category = this.keystrokeInfos.get(categoryId);
        if (!category) {
            throw new CKEditorError('accessibility-unknown-keystroke-info-category', this._editor, {
                groupId: id,
                categoryId
            });
        }
        category.groups.set(id, {
            id,
            label,
            keystrokes: keystrokes || []
        });
    }
    /**
     * Adds information about keystrokes to the {@link #keystrokeInfos keystroke information database}.
     *
     * Keystrokes without specified `groupId` or `categoryId` go to the `'common'` group in the `'contentEditing'` category (default).
     *
     * To add a keystroke brought by your plugin (using default group and category), use the following code:
     *
     * ```js
     * class MyPlugin extends Plugin {
     * 	// ...
     * 	init() {
     * 		const editor = this.editor;
     * 		const t = editor.t;
     *
     * 		// ...
     *
     * 		editor.accessibility.addKeystrokeInfos( {
     * 			keystrokes: [
     * 				{
     * 					label: t( 'Keystroke label' ),
     * 					keystroke: 'CTRL+B'
     * 				}
     * 			]
     * 		} );
     * 	}
     * }
     * ```
     * To add a keystroke in a specific existing `'widget'` group in the default `'contentEditing'` category:
     *
     * ```js
     * class MyPlugin extends Plugin {
     * 	// ...
     * 	init() {
     * 		const editor = this.editor;
     * 		const t = editor.t;
     *
     * 		// ...
     *
     * 		editor.accessibility.addKeystrokeInfos( {
     * 			// Add a keystroke to the existing "widget" group.
     * 			groupId: 'widget',
     * 			keystrokes: [
     * 				{
     * 					label: t( 'A an action on a selected widget' ),
     * 					keystroke: 'Ctrl+D',
     * 				}
     * 			]
     * 		} );
     * 	}
     * }
     * ```
     *
     * To add a keystroke to another existing category (using default group):
     *
     * ```js
     * class MyPlugin extends Plugin {
     * 	// ...
     * 	init() {
     * 		const editor = this.editor;
     * 		const t = editor.t;
     *
     * 		// ...
     *
     * 		editor.accessibility.addKeystrokeInfos( {
     * 			// Add keystrokes to the "navigation" category (one of defaults).
     * 			categoryId: 'navigation',
     * 			keystrokes: [
     * 				{
     * 					label: t( 'Keystroke label' ),
     * 					keystroke: 'CTRL+B'
     * 				}
     * 			]
     * 		} );
     * 	}
     * }
     * ```
     *
     * See {@link #keystrokeInfos}, {@link #addKeystrokeInfoGroup}, and {@link #addKeystrokeInfoCategory}.
     */ addKeystrokeInfos({ categoryId = DEFAULT_CATEGORY_ID, groupId = DEFAULT_GROUP_ID, keystrokes }) {
        if (!this.keystrokeInfos.has(categoryId)) {
            /**
             * Cannot add keystrokes in an unknown category. Use
             * {@link module:core/accessibility~Accessibility#addKeystrokeInfoCategory}
             * to add a new category or make sure the specified category exists.
             *
             * @error accessibility-unknown-keystroke-info-category
             * @param categoryId The id of the unknown keystroke category.
             * @param keystrokes Keystroke definitions about to be added.
             */ throw new CKEditorError('accessibility-unknown-keystroke-info-category', this._editor, {
                categoryId,
                keystrokes
            });
        }
        const category = this.keystrokeInfos.get(categoryId);
        if (!category.groups.has(groupId)) {
            /**
             * Cannot add keystrokes to an unknown group.
             *
             * Use {@link module:core/accessibility~Accessibility#addKeystrokeInfoGroup}
             * to add a new group or make sure the specified group exists.
             *
             * @error accessibility-unknown-keystroke-info-group
             * @param groupId The id of the unknown keystroke group.
             * @param categoryId The id of category the unknown group should belong to.
             * @param keystrokes Keystroke definitions about to be added.
             */ throw new CKEditorError('accessibility-unknown-keystroke-info-group', this._editor, {
                groupId,
                categoryId,
                keystrokes
            });
        }
        category.groups.get(groupId).keystrokes.push(...keystrokes);
    }
    /**
     * @inheritDoc
     */ constructor(editor){
        /**
         * Stores information about keystrokes brought by editor features for the users to interact with the editor, mainly
         * keystroke combinations and their accessible labels.
         *
         * This information is particularly useful for screen reader and other assistive technology users. It gets displayed
         * by the {@link module:ui/editorui/accessibilityhelp/accessibilityhelp~AccessibilityHelp Accessibility help} dialog.
         *
         * Keystrokes are organized in categories and groups. They can be added using ({@link #addKeystrokeInfoCategory},
         * {@link #addKeystrokeInfoGroup}, and {@link #addKeystrokeInfos}) methods.
         *
         * Please note that:
         * * two categories are always available:
         *   * `'contentEditing'` for keystrokes related to content creation,
         *   * `'navigation'` for keystrokes related to navigation in the UI and the content.
         * * unless specified otherwise, new keystrokes are added into the `'contentEditing'` category and the `'common'`
         * keystroke group within that category while using the {@link #addKeystrokeInfos} method.
         */ this.keystrokeInfos = new Map();
        this._editor = editor;
        const isMenuBarVisible = editor.config.get('menuBar.isVisible');
        const t = editor.locale.t;
        this.addKeystrokeInfoCategory({
            id: DEFAULT_CATEGORY_ID,
            label: t('Content editing keystrokes'),
            description: t('These keyboard shortcuts allow for quick access to content editing features.')
        });
        const navigationKeystrokes = [
            {
                label: t('Close contextual balloons, dropdowns, and dialogs'),
                keystroke: 'Esc'
            },
            {
                label: t('Open the accessibility help dialog'),
                keystroke: 'Alt+0'
            },
            {
                label: t('Move focus between form fields (inputs, buttons, etc.)'),
                keystroke: [
                    [
                        'Tab'
                    ],
                    [
                        'Shift+Tab'
                    ]
                ]
            },
            {
                label: t('Move focus to the toolbar, navigate between toolbars'),
                keystroke: 'Alt+F10',
                mayRequireFn: true
            },
            {
                label: t('Navigate through the toolbar or menu bar'),
                keystroke: [
                    [
                        'arrowup'
                    ],
                    [
                        'arrowright'
                    ],
                    [
                        'arrowdown'
                    ],
                    [
                        'arrowleft'
                    ]
                ]
            },
            {
                // eslint-disable-next-line max-len
                label: t('Execute the currently focused button. Executing buttons that interact with the editor content moves the focus back to the content.'),
                keystroke: [
                    [
                        'Enter'
                    ],
                    [
                        'Space'
                    ]
                ]
            }
        ];
        if (isMenuBarVisible) {
            navigationKeystrokes.push({
                label: t('Move focus to the menu bar, navigate between menu bars'),
                keystroke: 'Alt+F9',
                mayRequireFn: true
            });
        }
        this.addKeystrokeInfoCategory({
            id: 'navigation',
            label: t('User interface and content navigation keystrokes'),
            description: t('Use the following keystrokes for more efficient navigation in the CKEditor 5 user interface.'),
            groups: [
                {
                    id: 'common',
                    keystrokes: navigationKeystrokes
                }
            ]
        });
    }
}

class Editor extends ObservableMixin() {
    /**
     * Defines whether the editor is in the read-only mode.
     *
     * In read-only mode the editor {@link #commands commands} are disabled so it is not possible
     * to modify the document by using them. Also, the editable element(s) become non-editable.
     *
     * In order to make the editor read-only, you need to call the {@link #enableReadOnlyMode} method:
     *
     * ```ts
     * editor.enableReadOnlyMode( 'feature-id' );
     * ```
     *
     * Later, to turn off the read-only mode, call {@link #disableReadOnlyMode}:
     *
     * ```ts
     * editor.disableReadOnlyMode( 'feature-id' );
     * ```
     *
     * @readonly
     * @observable
     */ get isReadOnly() {
        return this._readOnlyLocks.size > 0;
    }
    set isReadOnly(value) {
        /**
         * The {@link module:core/editor/editor~Editor#isReadOnly Editor#isReadOnly} property is read-only since version `34.0.0`
         * and can be set only using {@link module:core/editor/editor~Editor#enableReadOnlyMode `Editor#enableReadOnlyMode( lockId )`} and
         * {@link module:core/editor/editor~Editor#disableReadOnlyMode `Editor#disableReadOnlyMode( lockId )`}.
         *
         * Usage before version `34.0.0`:
         *
         * ```ts
         * editor.isReadOnly = true;
         * editor.isReadOnly = false;
         * ```
         *
         * Usage since version `34.0.0`:
         *
         * ```ts
         * editor.enableReadOnlyMode( 'my-feature-id' );
         * editor.disableReadOnlyMode( 'my-feature-id' );
         * ```
         *
         * @error editor-isreadonly-has-no-setter
         */ throw new CKEditorError('editor-isreadonly-has-no-setter');
    }
    /**
     * Turns on the read-only mode in the editor.
     *
     * Editor can be switched to or out of the read-only mode by many features, under various circumstances. The editor supports locking
     * mechanism for the read-only mode. It enables easy control over the read-only mode when many features wants to turn it on or off at
     * the same time, without conflicting with each other. It guarantees that you will not make the editor editable accidentally (which
     * could lead to errors).
     *
     * Each read-only mode request is identified by a unique id (also called "lock"). If multiple plugins requested to turn on the
     * read-only mode, then, the editor will become editable only after all these plugins turn the read-only mode off (using the same ids).
     *
     * Note, that you cannot force the editor to disable the read-only mode if other plugins set it.
     *
     * After the first `enableReadOnlyMode()` call, the {@link #isReadOnly `isReadOnly` property} will be set to `true`:
     *
     * ```ts
     * editor.isReadOnly; // `false`.
     * editor.enableReadOnlyMode( 'my-feature-id' );
     * editor.isReadOnly; // `true`.
     * ```
     *
     * You can turn off the read-only mode ("clear the lock") using the {@link #disableReadOnlyMode `disableReadOnlyMode()`} method:
     *
     * ```ts
     * editor.enableReadOnlyMode( 'my-feature-id' );
     * // ...
     * editor.disableReadOnlyMode( 'my-feature-id' );
     * editor.isReadOnly; // `false`.
     * ```
     *
     * All "locks" need to be removed to enable editing:
     *
     * ```ts
     * editor.enableReadOnlyMode( 'my-feature-id' );
     * editor.enableReadOnlyMode( 'my-other-feature-id' );
     * // ...
     * editor.disableReadOnlyMode( 'my-feature-id' );
     * editor.isReadOnly; // `true`.
     * editor.disableReadOnlyMode( 'my-other-feature-id' );
     * editor.isReadOnly; // `false`.
     * ```
     *
     * @param lockId A unique ID for setting the editor to the read-only state.
     */ enableReadOnlyMode(lockId) {
        if (typeof lockId !== 'string' && typeof lockId !== 'symbol') {
            /**
             * The lock ID is missing or it is not a string or symbol.
             *
             * @error editor-read-only-lock-id-invalid
             */ throw new CKEditorError('editor-read-only-lock-id-invalid', null, {
                lockId
            });
        }
        if (this._readOnlyLocks.has(lockId)) {
            return;
        }
        this._readOnlyLocks.add(lockId);
        if (this._readOnlyLocks.size === 1) {
            // Manually fire the `change:isReadOnly` event as only getter is provided.
            this.fire('change:isReadOnly', 'isReadOnly', true, false);
        }
    }
    /**
     * Removes the read-only lock from the editor with given lock ID.
     *
     * When no lock is present on the editor anymore, then the {@link #isReadOnly `isReadOnly` property} will be set to `false`.
     *
     * @param lockId The lock ID for setting the editor to the read-only state.
     */ disableReadOnlyMode(lockId) {
        if (typeof lockId !== 'string' && typeof lockId !== 'symbol') {
            throw new CKEditorError('editor-read-only-lock-id-invalid', null, {
                lockId
            });
        }
        if (!this._readOnlyLocks.has(lockId)) {
            return;
        }
        this._readOnlyLocks.delete(lockId);
        if (this._readOnlyLocks.size === 0) {
            // Manually fire the `change:isReadOnly` event as only getter is provided.
            this.fire('change:isReadOnly', 'isReadOnly', false, true);
        }
    }
    /**
     * Sets the data in the editor.
     *
     * ```ts
     * editor.setData( '<p>This is editor!</p>' );
     * ```
     *
     * If your editor implementation uses multiple roots, you should pass an object with keys corresponding
     * to the editor root names and values equal to the data that should be set in each root:
     *
     * ```ts
     * editor.setData( {
     *     header: '<p>Content for header part.</p>',
     *     content: '<p>Content for main part.</p>',
     *     footer: '<p>Content for footer part.</p>'
     * } );
     * ```
     *
     * By default the editor accepts HTML. This can be controlled by injecting a different data processor.
     * See the {@glink features/markdown Markdown output} guide for more details.
     *
     * @param data Input data.
     */ setData(data) {
        this.data.set(data);
    }
    /**
     * Gets the data from the editor.
     *
     * ```ts
     * editor.getData(); // -> '<p>This is editor!</p>'
     * ```
     *
     * If your editor implementation uses multiple roots, you should pass root name as one of the options:
     *
     * ```ts
     * editor.getData( { rootName: 'header' } ); // -> '<p>Content for header part.</p>'
     * ```
     *
     * By default, the editor outputs HTML. This can be controlled by injecting a different data processor.
     * See the {@glink features/markdown Markdown output} guide for more details.
     *
     * A warning is logged when you try to retrieve data for a detached root, as most probably this is a mistake. A detached root should
     * be treated like it is removed, and you should not save its data. Note, that the detached root data is always an empty string.
     *
     * @param options Additional configuration for the retrieved data.
     * Editor features may introduce more configuration options that can be set through this parameter.
     * @param options.rootName Root name. Defaults to `'main'`.
     * @param options.trim Whether returned data should be trimmed. This option is set to `'empty'` by default,
     * which means that whenever editor content is considered empty, an empty string is returned. To turn off trimming
     * use `'none'`. In such cases exact content will be returned (for example `'<p>&nbsp;</p>'` for an empty editor).
     * @returns Output data.
     */ getData(options) {
        return this.data.get(options);
    }
    /**
     * Loads and initializes plugins specified in the configuration.
     *
     * @returns A promise which resolves once the initialization is completed, providing an array of loaded plugins.
     */ initPlugins() {
        const config = this.config;
        const plugins = config.get('plugins');
        const removePlugins = config.get('removePlugins') || [];
        const extraPlugins = config.get('extraPlugins') || [];
        const substitutePlugins = config.get('substitutePlugins') || [];
        return this.plugins.init(plugins.concat(extraPlugins), removePlugins, substitutePlugins);
    }
    /**
     * Destroys the editor instance, releasing all resources used by it.
     *
     * **Note** The editor cannot be destroyed during the initialization phase so if it is called
     * while the editor {@link #state is being initialized}, it will wait for the editor initialization before destroying it.
     *
     * @fires destroy
     * @returns A promise that resolves once the editor instance is fully destroyed.
     */ destroy() {
        let readyPromise = Promise.resolve();
        if (this.state == 'initializing') {
            readyPromise = new Promise((resolve)=>this.once('ready', resolve));
        }
        return readyPromise.then(()=>{
            this.fire('destroy');
            this.stopListening();
            this.commands.destroy();
        }).then(()=>this.plugins.destroy()).then(()=>{
            this.model.destroy();
            this.data.destroy();
            this.editing.destroy();
            this.keystrokes.destroy();
        })// Remove the editor from the context.
        // When the context was created by this editor, the context will be destroyed.
        .then(()=>this._context._removeEditor(this));
    }
    /**
     * Executes the specified command with given parameters.
     *
     * Shorthand for:
     *
     * ```ts
     * editor.commands.get( commandName ).execute( ... );
     * ```
     *
     * @param commandName The name of the command to execute.
     * @param commandParams Command parameters.
     * @returns The value returned by the {@link module:core/commandcollection~CommandCollection#execute `commands.execute()`}.
     */ execute(commandName, ...commandParams) {
        try {
            return this.commands.execute(commandName, ...commandParams);
        } catch (err) {
            // @if CK_DEBUG // throw err;
            /* istanbul ignore next -- @preserve */ CKEditorError.rethrowUnexpectedError(err, this);
        }
    }
    /**
     * Focuses the editor.
     *
     * **Note** To explicitly focus the editing area of the editor, use the
     * {@link module:engine/view/view~View#focus `editor.editing.view.focus()`} method of the editing view.
     *
     * Check out the {@glink framework/deep-dive/ui/focus-tracking#focus-in-the-editor-ui Focus in the editor UI} section
     * of the {@glink framework/deep-dive/ui/focus-tracking Deep dive into focus tracking} guide to learn more.
     */ focus() {
        this.editing.view.focus();
    }
    /* istanbul ignore next -- @preserve */ /**
     * Creates and initializes a new editor instance.
     *
     * This is an abstract method. Every editor type needs to implement its own initialization logic.
     *
     * See the `create()` methods of the existing editor types to learn how to use them:
     *
     * * {@link module:editor-classic/classiceditor~ClassicEditor.create `ClassicEditor.create()`}
     * * {@link module:editor-balloon/ballooneditor~BalloonEditor.create `BalloonEditor.create()`}
     * * {@link module:editor-decoupled/decouplededitor~DecoupledEditor.create `DecoupledEditor.create()`}
     * * {@link module:editor-inline/inlineeditor~InlineEditor.create `InlineEditor.create()`}
     */ static create(...args) {
        throw new Error('This is an abstract method.');
    }
    /**
     * Creates a new instance of the editor class.
     *
     * Usually, not to be used directly. See the static {@link module:core/editor/editor~Editor.create `create()`} method.
     *
     * @param config The editor configuration.
     */ constructor(config = {}){
        super();
        const constructor = this.constructor;
        // We don't pass translations to the config, because its behavior of splitting keys
        // with dots (e.g. `resize.width` => `resize: { width }`) breaks the translations.
        const { translations: defaultTranslations, ...defaultConfig } = constructor.defaultConfig || {};
        const { translations = defaultTranslations, ...rest } = config;
        // Prefer the language passed as the argument to the constructor instead of the constructor's `defaultConfig`, if both are set.
        const language = config.language || defaultConfig.language;
        this._context = config.context || new Context({
            language,
            translations
        });
        this._context._addEditor(this, !config.context);
        // Clone the plugins to make sure that the plugin array will not be shared
        // between editors and make the watchdog feature work correctly.
        const availablePlugins = Array.from(constructor.builtinPlugins || []);
        this.config = new Config(rest, defaultConfig);
        this.config.define('plugins', availablePlugins);
        this.config.define(this._context._getEditorConfig());
        this.plugins = new PluginCollection(this, availablePlugins, this._context.plugins);
        this.locale = this._context.locale;
        this.t = this.locale.t;
        this._readOnlyLocks = new Set();
        this.commands = new CommandCollection();
        this.set('state', 'initializing');
        this.once('ready', ()=>this.state = 'ready', {
            priority: 'high'
        });
        this.once('destroy', ()=>this.state = 'destroyed', {
            priority: 'high'
        });
        this.model = new Model();
        this.on('change:isReadOnly', ()=>{
            this.model.document.isReadOnly = this.isReadOnly;
        });
        const stylesProcessor = new StylesProcessor();
        this.data = new DataController(this.model, stylesProcessor);
        this.editing = new EditingController(this.model, stylesProcessor);
        this.editing.view.document.bind('isReadOnly').to(this);
        this.conversion = new Conversion([
            this.editing.downcastDispatcher,
            this.data.downcastDispatcher
        ], this.data.upcastDispatcher);
        this.conversion.addAlias('dataDowncast', this.data.downcastDispatcher);
        this.conversion.addAlias('editingDowncast', this.editing.downcastDispatcher);
        this.keystrokes = new EditingKeystrokeHandler(this);
        this.keystrokes.listenTo(this.editing.view.document);
        this.accessibility = new Accessibility(this);
    }
} /**
 * This error is thrown when trying to pass a `<textarea>` element to a `create()` function of an editor class.
 *
 * The only editor type which can be initialized on `<textarea>` elements is
 * the {@glink installation/getting-started/predefined-builds#classic-editor classic editor}.
 * This editor hides the passed element and inserts its own UI next to it. Other types of editors reuse the passed element as their root
 * editable element and therefore `<textarea>` is not appropriate for them. Use a `<div>` or another text container instead:
 *
 * ```html
 * <div id="editor">
 * 	<p>Initial content.</p>
 * </div>
 * ```
 *
 * @error editor-wrong-element
 */

/**
 * Checks if the editor is initialized on a `<textarea>` element that belongs to a form. If yes, it updates the editor's element
 * content before submitting the form.
 *
 * This helper requires the {@link module:core/editor/utils/elementapimixin~ElementApi ElementApi interface}.
 *
 * @param editor Editor instance.
 */ function attachToForm(editor) {
    if (!isFunction(editor.updateSourceElement)) {
        /**
         * The editor passed to `attachToForm()` must implement the
         * {@link module:core/editor/utils/elementapimixin~ElementApi} interface.
         *
         * @error attachtoform-missing-elementapi-interface
         */ throw new CKEditorError('attachtoform-missing-elementapi-interface', editor);
    }
    const sourceElement = editor.sourceElement;
    // Only when replacing a textarea which is inside of a form element.
    if (isTextArea(sourceElement) && sourceElement.form) {
        let originalSubmit;
        const form = sourceElement.form;
        const onSubmit = ()=>editor.updateSourceElement();
        // Replace the original form#submit() to call a custom submit function first.
        // Check if #submit is a function because the form might have an input named "submit".
        if (isFunction(form.submit)) {
            originalSubmit = form.submit;
            form.submit = ()=>{
                onSubmit();
                originalSubmit.apply(form);
            };
        }
        // Update the replaced textarea with data before each form#submit event.
        form.addEventListener('submit', onSubmit);
        // Remove the submit listener and revert the original submit method on
        // editor#destroy.
        editor.on('destroy', ()=>{
            form.removeEventListener('submit', onSubmit);
            if (originalSubmit) {
                form.submit = originalSubmit;
            }
        });
    }
}
function isTextArea(sourceElement) {
    return !!sourceElement && sourceElement.tagName.toLowerCase() === 'textarea';
}

/**
 * @license Copyright (c) 2003-2024, CKSource Holding sp. z o.o. All rights reserved.
 * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license
 */ /**
 * Implementation of the {@link module:core/editor/utils/dataapimixin~DataApi}.
 *
 * @deprecated This functionality is already implemented by the `Editor` class.
 */ function DataApiMixin(base) {
    return base;
}

/**
 * Implementation of the {@link module:core/editor/utils/elementapimixin~ElementApi}.
 */ function ElementApiMixin(base) {
    class Mixin extends base {
        updateSourceElement(data) {
            if (!this.sourceElement) {
                /**
                 * Cannot update the source element of a detached editor.
                 *
                 * The {@link module:core/editor/utils/elementapimixin~ElementApi#updateSourceElement `updateSourceElement()`}
                 * method cannot be called if you did not pass an element to `Editor.create()`.
                 *
                 * @error editor-missing-sourceelement
                 */ throw new CKEditorError('editor-missing-sourceelement', this);
            }
            const shouldUpdateSourceElement = this.config.get('updateSourceElementOnDestroy');
            const isSourceElementTextArea = this.sourceElement instanceof HTMLTextAreaElement;
            // The data returned by the editor might be unsafe, so we want to prevent rendering
            // unsafe content inside the source element different than <textarea>, which is considered
            // secure. This behavior could be changed by setting the `updateSourceElementOnDestroy`
            // configuration option to `true`.
            if (!shouldUpdateSourceElement && !isSourceElementTextArea) {
                setDataInElement(this.sourceElement, '');
                return;
            }
            const dataToSet = typeof data === 'string' ? data : this.data.get();
            setDataInElement(this.sourceElement, dataToSet);
        }
    }
    return Mixin;
}
// Backward compatibility with `mix`.
ElementApiMixin.updateSourceElement = ElementApiMixin(Object).prototype.updateSourceElement;

/**
 * Marks the source element on which the editor was initialized. This prevents other editor instances from using this element.
 *
 * Running multiple editor instances on the same source element causes various issues and it is
 * crucial this helper is called as soon as the source element is known to prevent collisions.
 *
 * @param editor Editor instance.
 * @param sourceElement Element to bind with the editor instance.
 */ function secureSourceElement(editor, sourceElement) {
    if (sourceElement.ckeditorInstance) {
        /**
         * A DOM element used to create the editor (e.g.
         * {@link module:editor-inline/inlineeditor~InlineEditor.create `InlineEditor.create()`})
         * has already been used to create another editor instance. Make sure each editor is
         * created with an unique DOM element.
         *
         * @error editor-source-element-already-used
         * @param element DOM element that caused the collision.
         */ throw new CKEditorError('editor-source-element-already-used', editor);
    }
    sourceElement.ckeditorInstance = editor;
    editor.once('destroy', ()=>{
        delete sourceElement.ckeditorInstance;
    });
}

class PendingActions extends ContextPlugin {
    /**
     * @inheritDoc
     */ static get pluginName() {
        return 'PendingActions';
    }
    /**
     * @inheritDoc
     */ init() {
        this.set('hasAny', false);
        this._actions = new Collection({
            idProperty: '_id'
        });
        this._actions.delegate('add', 'remove').to(this);
    }
    /**
     * Adds an action to the list of pending actions.
     *
     * This method returns an action object with an observable message property.
     * The action object can be later used in the {@link #remove} method. It also allows you to change the message.
     *
     * @param message The action message.
     * @returns An observable object that represents a pending action.
     */ add(message) {
        if (typeof message !== 'string') {
            /**
             * The message must be a string.
             *
             * @error pendingactions-add-invalid-message
             */ throw new CKEditorError('pendingactions-add-invalid-message', this);
        }
        const action = new (ObservableMixin())();
        action.set('message', message);
        this._actions.add(action);
        this.hasAny = true;
        return action;
    }
    /**
     * Removes an action from the list of pending actions.
     *
     * @param action An action object.
     */ remove(action) {
        this._actions.remove(action);
        this.hasAny = !!this._actions.length;
    }
    /**
     * Returns the first action from the list or null if the list is empty
     *
     * @returns The pending action object.
     */ get first() {
        return this._actions.get(0);
    }
    /**
     * Iterable interface.
     */ [Symbol.iterator]() {
        return this._actions[Symbol.iterator]();
    }
}

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var horizontalLine = "<svg viewBox=\"0 0 20 20\" xmlns=\"http://www.w3.org/2000/svg\"><path d=\"M2 9h16v2H2z\"/></svg>";

var html = "<svg viewBox=\"0 0 20 20\" xmlns=\"http://www.w3.org/2000/svg\"><path d=\"M17 0a2 2 0 0 1 2 2v7a1 1 0 0 1 1 1v5a1 1 0 0 1-.883.993l-.118.006L19 17a2 2 0 0 1-2 2H3a2 2 0 0 1-2-2l-.001-1.001-.116-.006A1 1 0 0 1 0 15v-5a1 1 0 0 1 .999-1L1 2a2 2 0 0 1 2-2h14zm.499 15.999h-15L2.5 17a.5.5 0 0 0 .5.5h14a.5.5 0 0 0 .5-.5l-.001-1.001zm-3.478-6.013-.014.014H14v.007l-1.525 1.525-1.46-1.46-.015.013V10h-1v5h1v-3.53l1.428 1.43.048.043.131-.129L14 11.421V15h1v-5h-.965l-.014-.014zM2 10H1v5h1v-2h2v2h1v-5H4v2H2v-2zm7 0H6v1h1v4h1v-4h1v-1zm8 0h-1v5h3v-1h-2v-4zm0-8.5H3a.5.5 0 0 0-.5.5l-.001 6.999h15L17.5 2a.5.5 0 0 0-.5-.5zM10 7v1H4V7h6zm3-2v1H4V5h9zm-3-2v1H4V3h6z\"/></svg>";

var indent = "<svg viewBox=\"0 0 20 20\" xmlns=\"http://www.w3.org/2000/svg\"><path d=\"M2 3.75c0 .414.336.75.75.75h14.5a.75.75 0 1 0 0-1.5H2.75a.75.75 0 0 0-.75.75zm5 6c0 .414.336.75.75.75h9.5a.75.75 0 1 0 0-1.5h-9.5a.75.75 0 0 0-.75.75zM2.75 16.5h14.5a.75.75 0 1 0 0-1.5H2.75a.75.75 0 1 0 0 1.5zM1.632 6.95 5.02 9.358a.4.4 0 0 1-.013.661l-3.39 2.207A.4.4 0 0 1 1 11.892V7.275a.4.4 0 0 1 .632-.326z\"/></svg>";

var outdent = "<svg viewBox=\"0 0 20 20\" xmlns=\"http://www.w3.org/2000/svg\"><path d=\"M2 3.75c0 .414.336.75.75.75h14.5a.75.75 0 1 0 0-1.5H2.75a.75.75 0 0 0-.75.75zm5 6c0 .414.336.75.75.75h9.5a.75.75 0 1 0 0-1.5h-9.5a.75.75 0 0 0-.75.75zM2.75 16.5h14.5a.75.75 0 1 0 0-1.5H2.75a.75.75 0 1 0 0 1.5zm1.618-9.55L.98 9.358a.4.4 0 0 0 .013.661l3.39 2.207A.4.4 0 0 0 5 11.892V7.275a.4.4 0 0 0-.632-.326z\"/></svg>";

var table = "<svg viewBox=\"0 0 20 20\" xmlns=\"http://www.w3.org/2000/svg\"><path d=\"M3 5.5v3h4v-3H3Zm0 4v3h4v-3H3Zm0 4v3h4v-3H3Zm5 3h4v-3H8v3Zm5 0h4v-3h-4v3Zm4-4v-3h-4v3h4Zm0-4v-3h-4v3h4Zm1.5 8A1.5 1.5 0 0 1 17 18H3a1.5 1.5 0 0 1-1.5-1.5V3c.222-.863 1.068-1.5 2-1.5h13c.932 0 1.778.637 2 1.5v13.5Zm-6.5-4v-3H8v3h4Zm0-4v-3H8v3h4Z\"/></svg>";

const icons = {
    bold,
    cancel,
    caption,
    check,
    cog,
    colorPalette,
    eraser,
    history,
    image,
    imageUpload,
    imageAssetManager,
    imageUrl,
    lowVision,
    textAlternative,
    loupe,
    previousArrow,
    nextArrow,
    importExport,
    paragraph,
    plus,
    text,
    alignBottom,
    alignMiddle,
    alignTop,
    alignLeft,
    alignCenter,
    alignRight,
    alignJustify,
    objectLeft,
    objectCenter,
    objectRight,
    objectFullWidth,
    objectInline,
    objectBlockLeft,
    objectBlockRight,
    objectSizeCustom,
    objectSizeFull,
    objectSizeLarge,
    objectSizeSmall,
    objectSizeMedium,
    pencil,
    pilcrow,
    quote,
    threeVerticalDots,
    dragIndicator,
    redo,
    undo,
    bulletedList,
    numberedList,
    todoList,
    codeBlock,
    browseFiles,
    heading1,
    heading2,
    heading3,
    heading4,
    heading5,
    heading6,
    horizontalLine,
    html,
    indent,
    outdent,
    table
};

export { Command, Context, ContextPlugin, DataApiMixin, Editor, ElementApiMixin, MultiCommand, PendingActions, Plugin, attachToForm, icons, secureSourceElement };
//# sourceMappingURL=index.js.map