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'use strict';
var $TypeError = require('es-errors/type');
var callBound = require('call-bound');
var regexTester = require('safe-regex-test');
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 isInteger = require('math-intrinsics/isInteger');
var Get = require('./Get');
var IsArray = require('./IsArray');
var ToObject = require('./ToObject');
var ToString = require('./ToString');
var isStringOrUndefined = require('../helpers/isStringOrUndefined');
// http://262.ecma-international.org/9.0/#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 (typeof matched !== 'string') {
throw new $TypeError('Assertion failed: `matched` must be a String');
}
var matchLength = matched.length;
if (typeof str !== 'string') {
throw new $TypeError('Assertion failed: `str` must be a String');
}
var stringLength = str.length;
if (!isInteger(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, isStringOrUndefined)) {
throw new $TypeError('Assertion failed: `captures` must be a List of Strings or `undefined`, got ' + inspect(captures));
}
if (typeof replacement !== 'string') {
throw new $TypeError('Assertion failed: `replacement` must be a String');
}
var tailPos = position + matchLength;
var m = captures.length;
if (typeof namedCaptures !== 'undefined') {
namedCaptures = ToObject(namedCaptures); // eslint-disable-line no-param-reassign
}
var result = '';
for (var i = 0; i < replacement.length; i += 1) {
// if this is a $, and it's not the end of the replacement
var current = $charAt(replacement, i);
var isLast = (i + 1) >= replacement.length;
var nextIsLast = (i + 2) >= replacement.length;
if (current === '$' && !isLast) {
var next = $charAt(replacement, i + 1);
if (next === '$') {
result += '$';
i += 1;
} else if (next === '&') {
result += matched;
i += 1;
} else if (next === '`') {
result += position === 0 ? '' : $strSlice(str, 0, position - 1);
i += 1;
} else if (next === "'") {
result += tailPos >= stringLength ? '' : $strSlice(str, tailPos);
i += 1;
} else {
var nextNext = nextIsLast ? null : $charAt(replacement, i + 2);
if (isDigit(next) && next !== '0' && (nextIsLast || !isDigit(nextNext))) {
// $1 through $9, and not followed by a digit
var n = $parseInt(next, 10);
// if (n > m, impl-defined)
result += n <= m && typeof captures[n - 1] === 'undefined' ? '' : captures[n - 1];
i += 1;
} else if (isDigit(next) && (nextIsLast || isDigit(nextNext))) {
// $00 through $99
var nn = next + nextNext;
var nnI = $parseInt(nn, 10) - 1;
// if nn === '00' or nn > m, impl-defined
result += nn <= m && typeof captures[nnI] === 'undefined' ? '' : captures[nnI];
i += 2;
} else if (next === '<') {
if (typeof namedCaptures === 'undefined') {
result += '$<';
i += 2;
} else {
var endIndex = $indexOf(replacement, '>', i);
if (endIndex > -1) {
var groupName = $strSlice(replacement, i + '$<'.length, endIndex);
var capture = Get(namedCaptures, groupName);
if (typeof capture !== 'undefined') {
result += ToString(capture);
}
i += ('<' + groupName + '>').length;
}
}
} else {
result += '$';
}
}
} else {
// the final $, or else not a $
result += $charAt(replacement, i);
}
}
return result;
};