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// Copyright (C) 2015 the V8 project authors. All rights reserved.
// This code is governed by the BSD license found in the LICENSE file.
/*---
es6id: 21.1.3.3
description: >
Return UTF16 Decode value of the lead and trail elements at index position.
info: |
21.1.3.3 String.prototype.codePointAt ( pos )
...
8. Let first be the code unit value of the element at index position in the
String S.
9. If first < 0xD800 or first > 0xDBFF or position+1 = size, return first.
10. Let second be the code unit value of the element at index position+1 in
the String S.
11. If second < 0xDC00 or second > 0xDFFF, return first.
12. Return UTF16Decode(first, second).
10.1.2 Static Semantics: UTF16Decode( lead, trail )
Two code units, lead and trail, that form a UTF-16 surrogate pair are
converted to a code point by performing the following steps:
1. Assert: 0xD800 ≤ lead ≤ 0xDBFF and 0xDC00 ≤ trail ≤ 0xDFFF.
2. Let cp be (lead – 0xD800) × 1024 + (trail – 0xDC00) + 0x10000.
3. Return the code point cp.
---*/
assert.sameValue('\uD800\uDC00'.codePointAt(0), 65536, 'U+10000');
assert.sameValue('\uD800\uDDD0'.codePointAt(0), 66000, 'U+101D0');
assert.sameValue('\uD800\uDFFF'.codePointAt(0), 66559, 'U+103FF');
assert.sameValue('\uDAAA\uDC00'.codePointAt(0), 763904, 'U+BA800');
assert.sameValue('\uDAAA\uDDD0'.codePointAt(0), 764368, 'U+BA9D0');
assert.sameValue('\uDAAA\uDFFF'.codePointAt(0), 764927, 'U+BABFF');
assert.sameValue('\uDBFF\uDC00'.codePointAt(0), 1113088, 'U+10FC00');
assert.sameValue('\uDBFF\uDDD0'.codePointAt(0), 1113552, 'U+10FDD0');
assert.sameValue('\uDBFF\uDFFF'.codePointAt(0), 1114111, 'U+10FFFF');
reportCompare(0, 0);
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