'use strict';
|
|
var GetIntrinsic = require('get-intrinsic');
|
|
var $TypeError = GetIntrinsic('%TypeError%');
|
|
var callBound = require('call-bind/callBound');
|
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 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;
|
};
|
