/**
 * @license
 * Copyright 2022 The Closure Library Authors. All Rights Reserved.
 *
 * 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.
 */

const path = require('path');

/**
 * Escape regular expression pattern by making the following replacements:
 *  * single backslash -> double backslash
 * @param {string} pattern
 * @returns {string}
 */
function escapePattern(pattern) {
  return pattern.replace(/\\/g, '\\\\');
}

/**
 * Replaces OS-specific path with POSIX style path.
 * @param {string} p
 * @returns {string}
 */
exports.normalizePath = (p) => {
  const root = new RegExp(escapePattern(`^${path.resolve('/')}`));
  const osSpecificSep = new RegExp(escapePattern(path.sep), 'g');
  return p.replace(root, path.posix.sep).replace(osSpecificSep, path.posix.sep);
};
