/**
 * @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
 */
/**
 * @module basic-styles/attributecommand
 */
import { Command, type Editor } from 'ckeditor5/src/core.js';
/**
 * An extension of the base {@link module:core/command~Command} class, which provides utilities for a command
 * that toggles a single attribute on a text or an element.
 *
 * `AttributeCommand` uses {@link module:engine/model/document~Document#selection}
 * to decide which nodes (if any) should be changed, and applies or removes the attribute from them.
 *
 * The command checks the {@link module:engine/model/model~Model#schema} to decide if it can be enabled
 * for the current selection and to which nodes the attribute can be applied.
 */
export default class AttributeCommand extends Command {
    /**
     * Flag indicating whether the command is active. The command is active when the
     * {@link module:engine/model/selection~Selection#hasAttribute selection has the attribute} which means that:
     *
     * * If the selection is not empty – That the attribute is set on the first node in the selection that allows this attribute.
     * * If the selection is empty – That the selection has the attribute itself (which means that newly typed
     * text will have this attribute, too).
     *
     * @observable
     * @readonly
     */
    value: boolean;
    /**
     * The attribute that will be set by the command.
     */
    readonly attributeKey: string;
    /**
     * @param attributeKey Attribute that will be set by the command.
     */
    constructor(editor: Editor, attributeKey: string);
    /**
     * Updates the command's {@link #value} and {@link #isEnabled} based on the current selection.
     */
    refresh(): void;
    /**
     * Executes the command – applies the attribute to the selection or removes it from the selection.
     *
     * If the command is active (`value == true`), it will remove attributes. Otherwise, it will set attributes.
     *
     * The execution result differs, depending on the {@link module:engine/model/document~Document#selection}:
     *
     * * If the selection is on a range, the command applies the attribute to all nodes in that range
     * (if they are allowed to have this attribute by the {@link module:engine/model/schema~Schema schema}).
     * * If the selection is collapsed in a non-empty node, the command applies the attribute to the
     * {@link module:engine/model/document~Document#selection} itself (note that typed characters copy attributes from the selection).
     * * If the selection is collapsed in an empty node, the command applies the attribute to the parent node of the selection (note
     * that the selection inherits all attributes from a node if it is in an empty node).
     *
     * @fires execute
     * @param options Command options.
     * @param options.forceValue If set, it will force the command behavior. If `true`,
     * the command will apply the attribute, otherwise the command will remove the attribute.
     * If not set, the command will look for its current value to decide what it should do.
     */
    execute(options?: {
        forceValue?: boolean;
    }): void;
    /**
     * Checks the attribute value of the first node in the selection that allows the attribute.
     * For the collapsed selection returns the selection attribute.
     *
     * @returns The attribute value.
     */
    private _getValueFromFirstAllowedNode;
}