37 lines
1.4 KiB
JavaScript
37 lines
1.4 KiB
JavaScript
|
'use strict';
|
||
|
|
// https://github.com/tc39/proposal-string-pad-start-end
|
||
|
|
var uncurryThis = require('../internals/function-uncurry-this');
|
||
|
|
var toLength = require('../internals/to-length');
|
||
|
|
var toString = require('../internals/to-string');
|
||
|
|
var $repeat = require('../internals/string-repeat');
|
||
|
|
var requireObjectCoercible = require('../internals/require-object-coercible');
|
||
|
|
|
||
|
|
var repeat = uncurryThis($repeat);
|
||
|
|
var stringSlice = uncurryThis(''.slice);
|
||
|
|
var ceil = Math.ceil;
|
||
|
|
|
||
|
|
// `String.prototype.{ padStart, padEnd }` methods implementation
|
||
|
|
var createMethod = function (IS_END) {
|
||
|
|
return function ($this, maxLength, fillString) {
|
||
|
|
var S = toString(requireObjectCoercible($this));
|
||
|
|
var intMaxLength = toLength(maxLength);
|
||
|
|
var stringLength = S.length;
|
||
|
|
var fillStr = fillString === undefined ? ' ' : toString(fillString);
|
||
|
|
var fillLen, stringFiller;
|
||
|
|
if (intMaxLength <= stringLength || fillStr === '') return S;
|
||
|
|
fillLen = intMaxLength - stringLength;
|
||
|
|
stringFiller = repeat(fillStr, ceil(fillLen / fillStr.length));
|
||
|
|
if (stringFiller.length > fillLen) stringFiller = stringSlice(stringFiller, 0, fillLen);
|
||
|
|
return IS_END ? S + stringFiller : stringFiller + S;
|
||
|
|
};
|
||
|
|
};
|
||
|
|
|
||
|
|
module.exports = {
|
||
|
|
// `String.prototype.padStart` method
|
||
|
|
// https://tc39.es/ecma262/#sec-string.prototype.padstart
|
||
|
|
start: createMethod(false),
|
||
|
|
// `String.prototype.padEnd` method
|
||
|
|
// https://tc39.es/ecma262/#sec-string.prototype.padend
|
||
|
|
end: createMethod(true)
|
||
|
|
};
|