99 lines
3.2 KiB
JavaScript
99 lines
3.2 KiB
JavaScript
'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 strSlice = callBound('String.prototype.slice');
|
|
|
|
var IsArray = require('./IsArray');
|
|
var IsInteger = require('./IsInteger');
|
|
var Type = require('./Type');
|
|
|
|
// 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));
|
|
}
|
|
|
|
var ES = this;
|
|
var isStringOrHole = function (capture, index, arr) { return ES.Type(capture) === 'String' || !(index in arr); };
|
|
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 $, and it's not the end of the replacement
|
|
var current = replacement[i];
|
|
var isLast = (i + 1) >= replacement.length;
|
|
var nextIsLast = (i + 2) >= replacement.length;
|
|
if (current === '$' && !isLast) {
|
|
var next = 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 : 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 += replacement[i];
|
|
}
|
|
}
|
|
return result;
|
|
};
|