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// for-of works on strings and String objects.
load(libdir + "string.js");
function test(s, expectedCodePoints) {
var copy = '';
var codepoints = 0;
var singleHighSurrogate = false;
for (var v of s) {
assertEq(typeof v, 'string');
assertEq(v.length, isSurrogatePair(v) ? 2 : 1);
assertEq(false, singleHighSurrogate && isLowSurrogate(v));
copy += v;
codepoints += 1;
singleHighSurrogate = !isSurrogatePair(v) && isHighSurrogate(v);
}
assertEq(copy, String(s));
assertEq(codepoints, expectedCodePoints);
}
test('', 0);
test('abc', 3);
test('a \0 \ufffe \ufeff', 7);
// Non-BMP characters are generally passed to JS in UTF-16, as surrogate pairs.
// ES6 requires that such pairs be treated as a single code point in for-of.
test('\ud808\udf45', 1);
// Also test invalid surrogate pairs:
// (1) High surrogate not followed by low surrogate
test('\ud808', 1);
test('\ud808\u0000', 2);
// (2) Low surrogate not preceded by high surrogate
test('\udf45', 1);
test('\u0000\udf45', 2);
// (3) Low surrogate followed by high surrogate
test('\udf45\ud808', 2);
test(new String(''), 0);
test(new String('abc'), 3);
test(new String('a \0 \ufffe \ufeff'), 7);
test(new String('\ud808\udf45'), 1);
test(new String('\ud808'), 1);
test(new String('\ud808\u0000'), 2);
test(new String('\udf45'), 1);
test(new String('\u0000\udf45'), 2);
test(new String('\udf45\ud808'), 2);
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