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27 lines
876 B
27 lines
876 B
'use strict';
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var $TypeError = require('es-errors/type');
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var StringPad = require('./StringPad');
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var ToLength = require('./ToLength');
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var ToString = require('./ToString');
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// https://262.ecma-international.org/15.0/#sec-stringpaddingbuiltinsimpl
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module.exports = function StringPaddingBuiltinsImpl(O, maxLength, fillString, placement) {
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if (placement !== 'start' && placement !== 'end' && placement !== 'START' && placement !== 'END') {
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throw new $TypeError('Assertion failed: `placement` must be ~START~ or ~END~');
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}
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var S = ToString(O); // step 1
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var intMaxLength = ToLength(maxLength); // step 2
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var stringLength = S.length; // step 3
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if (intMaxLength <= stringLength) { return S; } // step 4
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var filler = typeof fillString === 'undefined' ? ' ' : ToString(fillString); // steps 5-6
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return StringPad(S, intMaxLength, filler, placement); // step 7
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};
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