com.google.javascript.jscomp.js.util.stringpadding.js Maven / Gradle / Ivy

/*
 * Copyright 2017 The Closure Compiler Authors.
 *
 * 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.
 */

'require es6/string/repeat';

/**
 * Repeats the given string as necessary to reach the given length,
 * truncating any extra characters.
 * @param {string|undefined} padString
 * @param {number} padLength
 * @return {string}
 */
$jscomp.stringPadding = function(padString, padLength) {
  var padding = padString !== undefined ? String(padString) : ' ';
  if (!(padLength > 0) || !padding) return '';
  var repeats = Math.ceil(padLength / padding.length);
  return padding.repeat(repeats).substring(0, padLength);
};