1 files changed, 104 insertions, 0 deletions
diff --git a/src/node_modules/es-abstract/2017/GetSubstitution.js b/src/node_modules/es-abstract/2017/GetSubstitution.js
new file mode 100644
index 0000000..6497aae
--- /dev/null
+++ b/src/node_modules/es-abstract/2017/GetSubstitution.js
@@ -0,0 +1,104 @@
+
+'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;
+};