| '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 IsInteger = require('./IsInteger'); |
| 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://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 (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 (!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, isStringOrHole)) { |
| throw new $TypeError('Assertion failed: `captures` must be a 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 |
| } |
| |
| 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 && Type(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 = $parseInt(nn, 10) - 1; |
| // if nn === '00' or nn > m, impl-defined |
| result += nn <= m && Type(captures[nnI]) === 'Undefined' ? '' : captures[nnI]; |
| i += 2; |
| } else if (next === '<') { |
| // eslint-disable-next-line max-depth |
| if (Type(namedCaptures) === 'Undefined') { |
| result += '$<'; |
| i += 2; |
| } else { |
| var endIndex = $indexOf(replacement, '>', i); |
| // eslint-disable-next-line max-depth |
| if (endIndex > -1) { |
| var groupName = $strSlice(replacement, i + '$<'.length, endIndex); |
| var capture = Get(namedCaptures, groupName); |
| // eslint-disable-next-line max-depth |
| if (Type(capture) !== 'Undefined') { |
| result += ToString(capture); |
| } |
| i += ('<' + groupName + '>').length; |
| } |
| } |
| } else { |
| result += '$'; |
| } |
| } |
| } else { |
| // the final $, or else not a $ |
| result += $charAt(replacement, i); |
| } |
| } |
| return result; |
| }; |