Zabbix

/*

** Copyright (C) 2001-2025 Zabbix SIA

**

** This program is free software: you can redistribute it and/or modify it under the terms of

** the GNU Affero General Public License as published by the Free Software Foundation, version 3.

**

** This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY;

** without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

** See the GNU Affero General Public License for more details.

**

** You should have received a copy of the GNU Affero General Public License along with this program.

** If not, see <https://www.gnu.org/licenses/>.

**/

​

​

/*

 * Template class implements token replacement logic for strings containing HTML and tokens.

 *

 * The following format is used for tokens: #{token_name}.

 * When found in template String, token will be replaced with value of the key "token_name" of object passed to

 * evaluate function. All occurrences of tokens are replaced by values from object with HTML entities escaped.

 * Token name should be prefixed with character '*' to avoid escaping of HTML entities (for example, #{*test}).

 * Backslash character (\\) can be used to escape token (such tokens will not be affected).

 *

 * Nested object properties could be used in templated by using square bracket token syntax (for example, #{a[b][c]}).

 * Previous example will look for nested value a->b->c ({'a': {'b': {'c': 'value'}}}).

 */

​

class Template {

​

    /**

     * @type {string}

     */

    #template;

​

    /**

     * @param {string} template

     */

    constructor(template) {

        this.#template = template;

    }

​

    /**

     * Fill template with data defined in object.

     *

     * @param {Object} data

     *

     * @return {string}

     */

    evaluate(data) {

        let template = this.#template;

        let result = '';

​

        while (template.length > 0) {

            const match = template.match(/(^|.|\r|\n)(#\{(.*?)\})/);

​

            if (match) {

                result += template.substring(0, match.index);

                result += this.#match(match, data);

                template = template.substring(match.index + match[0].length);

            }

            else {

                result += template;