'use strict';
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var $TypeError = require('es-errors/type');
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var regexTester = require('safe-regex-test');
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var every = require('../helpers/every');
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var inspect = require('object-inspect');
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var Get = require('./Get');
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var IsArray = require('./IsArray');
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var min = require('./min');
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var StringIndexOf = require('./StringIndexOf');
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var StringToNumber = require('./StringToNumber');
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var substring = require('./substring');
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var ToString = require('./ToString');
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var Type = require('./Type');
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var isInteger = require('../helpers/isInteger');
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var isStringOrUndefined = require('../helpers/isStringOrUndefined');
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var isPrefixOf = require('../helpers/isPrefixOf');
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var startsWithDollarDigit = regexTester(/^\$[0-9]/);
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var startsWithDollarTwoDigit = regexTester(/^\$[0-9][0-9]/);
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// http://www.ecma-international.org/ecma-262/14.0/#sec-getsubstitution
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// eslint-disable-next-line max-statements, max-params, max-lines-per-function
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module.exports = function GetSubstitution(matched, str, position, captures, namedCaptures, replacementTemplate) {
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if (typeof matched !== 'string') {
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throw new $TypeError('Assertion failed: `matched` must be a String');
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}
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if (typeof str !== 'string') {
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throw new $TypeError('Assertion failed: `str` must be a String');
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}
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if (!isInteger(position) || position < 0) {
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throw new $TypeError('Assertion failed: `position` must be a nonnegative integer, got ' + inspect(position));
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}
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if (!IsArray(captures) || !every(captures, isStringOrUndefined)) {
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throw new $TypeError('Assertion failed: `captures` must be a possibly-empty List of Strings or `undefined`, got ' + inspect(captures));
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}
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if (typeof namedCaptures !== 'undefined' && Type(namedCaptures) !== 'Object') {
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throw new $TypeError('Assertion failed: `namedCaptures` must be `undefined` or an Object');
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}
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if (typeof replacementTemplate !== 'string') {
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throw new $TypeError('Assertion failed: `replacementTemplate` must be a String');
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}
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var stringLength = str.length; // step 1
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if (position > stringLength) {
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throw new $TypeError('Assertion failed: position > stringLength, got ' + inspect(position)); // step 2
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}
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var templateRemainder = replacementTemplate; // step 3
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var result = ''; // step 4
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while (templateRemainder !== '') { // step 5
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// 5.a NOTE: The following steps isolate ref (a prefix of templateRemainder), determine refReplacement (its replacement), and then append that replacement to result.
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var ref, refReplacement, capture;
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if (isPrefixOf('$$', templateRemainder)) { // step 5.b
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ref = '$$'; // step 5.b.i
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refReplacement = '$'; // step 5.b.ii
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} else if (isPrefixOf('$`', templateRemainder)) { // step 5.c
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ref = '$`'; // step 5.c.i
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refReplacement = substring(str, 0, position); // step 5.c.ii
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} else if (isPrefixOf('$&', templateRemainder)) { // step 5.d
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ref = '$&'; // step 5.d.i
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refReplacement = matched; // step 5.d.ii
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} else if (isPrefixOf('$\'', templateRemainder)) { // step 5.e
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ref = '$\''; // step 5.e.i
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var matchLength = matched.length; // step 5.e.ii
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var tailPos = position + matchLength; // step 5.e.iii
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refReplacement = substring(str, min(tailPos, stringLength)); // step 5.e.iv
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// 5.e.v NOTE: tailPos can exceed stringLength only if this abstract operation was invoked by a call to the intrinsic @@replace method of %RegExp.prototype% on an object whose "exec" property is not the intrinsic %RegExp.prototype.exec%.
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} else if (startsWithDollarDigit(templateRemainder)) { // step 5.f
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var digitCount = startsWithDollarTwoDigit(templateRemainder) ? 2 : 1; // step 5.f.i
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ref = substring(templateRemainder, 0, 1 + digitCount); // step 5.f.ii
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var digits = substring(templateRemainder, 1, 1 + digitCount); // step 5.f.iii
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var index = StringToNumber(digits); // step 5.f.iv
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if (index < 0 || index > 99) {
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throw new $TypeError('Assertion failed: `index` must be >= 0 and <= 99'); // step 5.f.v
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}
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var captureLen = captures.length; // step 5.f.vi
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if (1 <= index && index <= captureLen) { // step 5.f.vii
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capture = captures[index - 1]; // step 5.f.vii.1
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if (typeof capture === 'undefined') { // step 5.f.vii.2
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refReplacement = ''; // step 5.f.vii.2.a
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} else { // step 5.f.vii.3
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refReplacement = capture; // step 5.f.vii.3.a
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}
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} else { // step 5.f.viii
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refReplacement = ref; // step 5.f.viii.1
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}
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} else if (isPrefixOf('$<', templateRemainder)) { // step 5.g
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var gtPos = StringIndexOf(templateRemainder, '>', 0); // step 5.g.i
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if (gtPos === -1 || typeof namedCaptures === 'undefined') { // step 5.g.ii
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ref = '$<'; // step 5.g.ii.1
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refReplacement = ref; // step 5.g.ii.2
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} else { // step 5.g.iii
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ref = substring(templateRemainder, 0, gtPos + 1); // step 5.g.iii.1
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var groupName = substring(templateRemainder, 2, gtPos); // step 5.g.iii.2
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if (Type(namedCaptures) !== 'Object') {
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throw new $TypeError('Assertion failed: Type(namedCaptures) is not Object'); // step 5.g.iii.3
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}
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capture = Get(namedCaptures, groupName); // step 5.g.iii.4
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if (typeof capture === 'undefined') { // step 5.g.iii.5
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refReplacement = ''; // step 5.g.iii.5.a
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} else { // step 5.g.iii.6
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refReplacement = ToString(capture); // step 5.g.iii.6.a
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}
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}
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} else { // step 5.h
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ref = substring(templateRemainder, 0, 1); // step 5.h.i
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refReplacement = ref; // step 5.h.ii
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}
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var refLength = ref.length; // step 5.i
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templateRemainder = substring(templateRemainder, refLength); // step 5.j
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result += refReplacement; // step 5.k
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}
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return result; // step 6
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};
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