1var createPadding = require('./_createPadding'),
2    stringSize = require('./_stringSize'),
3    toInteger = require('./toInteger'),
4    toString = require('./toString');
5
6/* Built-in method references for those with the same name as other `lodash` methods. */
7var nativeCeil = Math.ceil,
8    nativeFloor = Math.floor;
9
10/**
11 * Pads `string` on the left and right sides if it's shorter than `length`.
12 * Padding characters are truncated if they can't be evenly divided by `length`.
13 *
14 * @static
15 * @memberOf _
16 * @since 3.0.0
17 * @category String
18 * @param {string} [string=''] The string to pad.
19 * @param {number} [length=0] The padding length.
20 * @param {string} [chars=' '] The string used as padding.
21 * @returns {string} Returns the padded string.
22 * @example
23 *
24 * _.pad('abc', 8);
25 * // => '  abc   '
26 *
27 * _.pad('abc', 8, '_-');
28 * // => '_-abc_-_'
29 *
30 * _.pad('abc', 3);
31 * // => 'abc'
32 */
33function pad(string, length, chars) {
34  string = toString(string);
35  length = toInteger(length);
36
37  var strLength = length ? stringSize(string) : 0;
38  if (!length || strLength >= length) {
39    return string;
40  }
41  var mid = (length - strLength) / 2;
42  return (
43    createPadding(nativeFloor(mid), chars) +
44    string +
45    createPadding(nativeCeil(mid), chars)
46  );
47}
48
49module.exports = pad;
50