100 lines
3.2 KiB
JavaScript
100 lines
3.2 KiB
JavaScript
|
|
||
|
|
'use strict';
|
||
|
|
|
||
|
|
var GetIntrinsic = require('get-intrinsic');
|
||
|
|
|
||
|
|
var $TypeError = require('es-errors/type');
|
||
|
|
var $parseInt = GetIntrinsic('%parseInt%');
|
||
|
|
|
||
|
|
var inspect = require('object-inspect');
|
||
|
|
|
||
|
|
var regexTester = require('safe-regex-test');
|
||
|
|
var callBound = require('call-bind/callBound');
|
||
|
|
var every = require('../helpers/every');
|
||
|
|
|
||
|
|
var isDigit = regexTester(/^[0-9]$/);
|
||
|
|
|
||
|
|
var $charAt = callBound('String.prototype.charAt');
|
||
|
|
var $strSlice = callBound('String.prototype.slice');
|
||
|
|
|
||
|
|
var IsArray = require('./IsArray');
|
||
|
|
|
||
|
|
var isInteger = require('../helpers/isInteger');
|
||
|
|
var isStringOrUndefined = require('../helpers/isStringOrUndefined');
|
||
|
|
|
||
|
|
// https://262.ecma-international.org/6.0/#sec-getsubstitution
|
||
|
|
|
||
|
|
// eslint-disable-next-line max-statements, max-lines-per-function
|
||
|
|
module.exports = function GetSubstitution(matched, str, position, captures, 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, 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;
|
||
|
|
|
||
|
|
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 = $parseInt(nn, 10) - 1;
|
||
|
|
// if nn === '00' or nn > m, impl-defined
|
||
|
|
result += nn <= m && typeof captures[nnI] === 'undefined' ? '' : captures[nnI];
|
||
|
|
i += 2;
|
||
|
|
} else {
|
||
|
|
result += '$';
|
||
|
|
}
|
||
|
|
}
|
||
|
|
} else {
|
||
|
|
// the final $, or else not a $
|
||
|
|
result += $charAt(replacement, i);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
return result;
|
||
|
|
};
|