Commit

1 files changed, 23 insertions, 0 deletions

diff --git a/src/node_modules/es-abstract/2016/UTF16Encoding.js b/src/node_modules/es-abstract/2016/UTF16Encoding.js
new file mode 100644
index 0000000..7cedbb2
--- /dev/null
+++ b/src/node_modules/es-abstract/2016/UTF16Encoding.js
@@ -0,0 +1,23 @@
+'use strict';
+
+var GetIntrinsic = require('../GetIntrinsic');
+
+var $TypeError = GetIntrinsic('%TypeError%');
+var $fromCharCode = GetIntrinsic('%String.fromCharCode%');
+
+var floor = require('./floor');
+var modulo = require('./modulo');
+
+// https://ecma-international.org/ecma-262/7.0/#sec-utf16encoding
+
+module.exports = function UTF16Encoding(cp) {
+	if (typeof cp !== 'number' || cp < 0 || cp > 0x10FFFF) {
+		throw new $TypeError('Assertion failed: `cp` must be >= 0 and <= 0x10FFFF');
+	}
+	if (cp <= 65535) {
+		return cp;
+	}
+	var cu1 = floor((cp - 65536) / 1024) + 0xD800;
+	var cu2 = modulo(cp - 65536, 1024) + 0xDC00;
+	return $fromCharCode(cu1) + $fromCharCode(cu2);
+};