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Edit File: GetSubstitution.js

'use strict';

var GetIntrinsic = require('get-intrinsic');

var $TypeError = GetIntrinsic('%TypeError%');

var callBound = require('call-bind/callBound');
var regexTester = require('../helpers/regexTester');
var every = require('../helpers/every');

var $charAt = callBound('String.prototype.charAt');
var $strSlice = callBound('String.prototype.slice');
var $indexOf = callBound('String.prototype.indexOf');
var $parseInt = parseInt;

var isDigit = regexTester(/^[0-9]$/);

var inspect = require('object-inspect');

var Get = require('./Get');
var IsArray = require('./IsArray');
var IsIntegralNumber = require('./IsIntegralNumber');
var ToObject = require('./ToObject');
var ToString = require('./ToString');
var Type = require('./Type');

var canDistinguishSparseFromUndefined = 0 in [undefined]; // IE 6 - 8 have a bug where this returns false

var isStringOrHole = function (capture, index, arr) {
	return Type(capture) === 'String' || (canDistinguishSparseFromUndefined ? !(index in arr) : Type(capture) === 'Undefined');
};

// http://www.ecma-international.org/ecma-262/12.0/#sec-getsubstitution

// eslint-disable-next-line max-statements, max-params, max-lines-per-function
module.exports = function GetSubstitution(matched, str, position, captures, namedCaptures, replacement) {
	if (Type(matched) !== 'String') {
		throw new $TypeError('Assertion failed: `matched` must be a String');
	}
	var matchLength = matched.length;

if (Type(str) !== 'String') {
		throw new $TypeError('Assertion failed: `str` must be a String');
	}
	var stringLength = str.length;

if (!IsIntegralNumber(position) || position < 0 || position > stringLength) {
		throw new $TypeError('Assertion failed: `position` must be a nonnegative integer, and less than or equal to the length of `string`, got ' + inspect(position));
	}

if (!IsArray(captures) || !every(captures, isStringOrHole)) {
		throw new $TypeError('Assertion failed: `captures` must be a possibly-empty List of Strings, got ' + inspect(captures));
	}

if (Type(replacement) !== 'String') {
		throw new $TypeError('Assertion failed: `replacement` must be a String');
	}

var tailPos = position + matchLength;
	var m = captures.length;
	if (Type(namedCaptures) !== 'Undefined') {
		namedCaptures = ToObject(namedCaptures); // eslint-disable-line no-param-reassign
	}

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