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node_modules/es-abstract/2017/GetSubstitution.js
| 104 lines
| 3.5 KiB
| application/javascript
| JavascriptLexer
|
| r789 | ||||
| 'use strict'; | ||||
| var GetIntrinsic = require('../GetIntrinsic'); | ||||
| var $TypeError = GetIntrinsic('%TypeError%'); | ||||
| var $parseInt = GetIntrinsic('%parseInt%'); | ||||
| var inspect = require('object-inspect'); | ||||
| var regexTester = require('../helpers/regexTester'); | ||||
| var callBound = require('../helpers/callBound'); | ||||
| var every = require('../helpers/every'); | ||||
| var isDigit = regexTester(/^[0-9]$/); | ||||
| var $charAt = callBound('String.prototype.charAt'); | ||||
| var $strSlice = callBound('String.prototype.slice'); | ||||
| var IsArray = require('./IsArray'); | ||||
| var IsInteger = require('./IsInteger'); | ||||
| 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'); | ||||
| }; | ||||
| // https://www.ecma-international.org/ecma-262/6.0/#sec-getsubstitution | ||||
| // eslint-disable-next-line max-statements, max-params, max-lines-per-function | ||||
| module.exports = function GetSubstitution(matched, str, position, captures, 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; | ||||
| 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 = $parseInt(nn, 10) - 1; | ||||
| // if nn === '00' or nn > m, impl-defined | ||||
| result += (nn <= m && Type(captures[nnI]) === 'Undefined') ? '' : captures[nnI]; | ||||
| i += 2; | ||||
| } else { | ||||
| result += '$'; | ||||
| } | ||||
| } | ||||
| } else { | ||||
| // the final $, or else not a $ | ||||
| result += $charAt(replacement, i); | ||||
| } | ||||
| } | ||||
| return result; | ||||
| }; | ||||