HORIZON PROJECT

var createPadding = require('./_createPadding'),

    stringSize = require('./_stringSize'),

    toInteger = require('./toInteger'),

    toString = require('./toString');

/* Built-in method references for those with the same name as other `lodash` methods. */

var nativeCeil = Math.ceil,

    nativeFloor = Math.floor;

/**

 * Pads `string` on the left and right sides if it's shorter than `length`.

 * Padding characters are truncated if they can't be evenly divided by `length`.

 *

 * @static

 * @memberOf _

 * @since 3.0.0

 * @category String

 * @param {string} [string=''] The string to pad.

 * @param {number} [length=0] The padding length.

 * @param {string} [chars=' '] The string used as padding.

 * @returns {string} Returns the padded string.

 * @example

 *

 * _.pad('abc', 8);

 * // => '  abc   '

 *

 * _.pad('abc', 8, '_-');

 * // => '_-abc_-_'

 *

 * _.pad('abc', 3);

 * // => 'abc'

 */

function pad(string, length, chars) {

  string = toString(string);

  length = toInteger(length);

  var strLength = length ? stringSize(string) : 0;

  if (!length || strLength >= length) {

    return string;

  }

  var mid = (length - strLength) / 2;

  return (

    createPadding(nativeFloor(mid), chars) +

    string +

    createPadding(nativeCeil(mid), chars)

  );

}

module.exports = pad;