You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
43 lines
1.2 KiB
43 lines
1.2 KiB
'use strict'; |
|
|
|
var GetIntrinsic = require('get-intrinsic'); |
|
|
|
var $TypeError = GetIntrinsic('%TypeError%'); |
|
|
|
var callBound = require('call-bind/callBound'); |
|
|
|
var ToLength = require('./ToLength'); |
|
var ToString = require('./ToString'); |
|
|
|
var $strSlice = callBound('String.prototype.slice'); |
|
|
|
// https://262.ecma-international.org/11.0/#sec-stringpad |
|
|
|
module.exports = function StringPad(O, maxLength, fillString, placement) { |
|
if (placement !== 'start' && placement !== 'end') { |
|
throw new $TypeError('Assertion failed: `placement` must be "start" or "end"'); |
|
} |
|
var S = ToString(O); |
|
var intMaxLength = ToLength(maxLength); |
|
var stringLength = S.length; |
|
if (intMaxLength <= stringLength) { |
|
return S; |
|
} |
|
var filler = typeof fillString === 'undefined' ? ' ' : ToString(fillString); |
|
if (filler === '') { |
|
return S; |
|
} |
|
var fillLen = intMaxLength - stringLength; |
|
|
|
// the String value consisting of repeated concatenations of filler truncated to length fillLen. |
|
var truncatedStringFiller = ''; |
|
while (truncatedStringFiller.length < fillLen) { |
|
truncatedStringFiller += filler; |
|
} |
|
truncatedStringFiller = $strSlice(truncatedStringFiller, 0, fillLen); |
|
|
|
if (placement === 'start') { |
|
return truncatedStringFiller + S; |
|
} |
|
return S + truncatedStringFiller; |
|
};
|
|
|