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.
44 lines
1.2 KiB
44 lines
1.2 KiB
2 years ago
|
'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;
|
||
|
|
};
|