/**
 * Copyright (C) 2016 Michael Kourlas
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
import { IStringOptions } from "../options";
import XmlNode from "./XmlNode";
/**
 * Represents an XML character reference.
 *
 * An XML character reference is structured as follows, where `{dec}` is the
 * decimal representation code point corresponding to a particular Unicode
 * character:
 *
 * ```xml
 * &#{dec};
 * ```
 *
 * The corresponding hexadecimal version is structured as follows, where
 * `{hex}` is the hexadecimal representation code point corresponding to a
 * particular Unicode character:
 *
 * ```xml
 * &#x{hex};
 * ```
 *
 * Unicode characters outside of the Basic Multilingual Plane are represented
 * using a surrogate pair consisting of two character references.
 *
 * The `{dec}` and `{hex}` values are defined by the `char` and `hex`
 * properties of this node; the former is the character to be represented while
 * the latter indicates whether the decimal or hexadecimal representation
 * should be used.
 *
 * XmlCharRef nodes cannot have any children.
 */
export default class XmlCharRef extends XmlNode {
    private _char;
    private _hex;
    /**
     * Initializes a new instance of the {@link XmlCharRef} class.
     *
     * @param char The character to represent using the reference.
     * @param hex Whether to use the hexadecimal or decimal representation for
     *            the reference. If left undefined, decimal is the default.
     */
    constructor(char: string, hex?: boolean);
    /**
     * Gets the character to represent using the reference.
     *
     * @returns The character to represent using the reference.
     */
    /**
     * Sets the character to represent using the reference.
     *
     * @param char The character to represent using the reference.
     */
    char: string;
    /**
     * Gets whether or not to use the hexadecimal or decimal representation for
     * the reference.
     *
     * @returns Whether or not to use the hexadecimal or decimal representation
     *          for the reference.
     */
    /**
     * Sets whether or not to use the hexadecimal or decimal representation for
     * the reference.
     *
     * @param hex Whether or not to use the hexadecimal or decimal
     *            representation for the reference.
     */
    hex: boolean;
    /**
     * Throws an exception since {@link XmlCharRef} nodes cannot have any
     * children.
     *
     * @returns This method does not return.
     */
    children(): XmlNode[];
    /**
     * Throws an exception since {@link XmlCharRef} nodes cannot have any
     * children.
     *
     * @param node This parameter is unused.
     * @param index This parameter is unused.
     *
     * @returns This method does not return.
     */
    insertChild(node: XmlNode, index?: number): XmlNode | undefined;
    /**
     * Throws an exception since {@link XmlCharRef} nodes cannot have any
     * children.
     *
     * @param node This parameter is unused.
     *
     * @returns This method does not return.
     */
    removeChild(node: XmlNode): boolean;
    /**
     * Throws an exception since {@link XmlCharRef} nodes cannot have any
     * children.
     *
     * @param index This parameter is unused.
     *
     * @returns This method does not return.
     */
    removeChildAtIndex(index: number): XmlNode;
    /**
     * Returns an XML string representation of this node.
     *
     * @param options Formatting options for the string representation.
     *
     * @returns {string} An XML string representation of this node.
     */
    toString(options?: IStringOptions): string;
}