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comparison: js/src/jit-test/tests/for-of/strings.js
js/src/jit-test/tests/for-of/strings.js
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| 1 // for-of works on strings and String objects. | |
| 2 | |
| 3 load(libdir + "string.js"); | |
| 4 | |
| 5 function test(s, expectedCodePoints) { | |
| 6 var copy = ''; | |
| 7 var codepoints = 0; | |
| 8 var singleHighSurrogate = false; | |
| 9 for (var v of s) { | |
| 10 assertEq(typeof v, 'string'); | |
| 11 assertEq(v.length, isSurrogatePair(v) ? 2 : 1); | |
| 12 assertEq(false, singleHighSurrogate && isLowSurrogate(v)); | |
| 13 copy += v; | |
| 14 codepoints += 1; | |
| 15 singleHighSurrogate = !isSurrogatePair(v) && isHighSurrogate(v); | |
| 16 } | |
| 17 assertEq(copy, String(s)); | |
| 18 assertEq(codepoints, expectedCodePoints); | |
| 19 } | |
| 20 | |
| 21 test('', 0); | |
| 22 test('abc', 3); | |
| 23 test('a \0 \ufffe \ufeff', 7); | |
| 24 | |
| 25 // Non-BMP characters are generally passed to JS in UTF-16, as surrogate pairs. | |
| 26 // ES6 requires that such pairs be treated as a single code point in for-of. | |
| 27 test('\ud808\udf45', 1); | |
| 28 | |
| 29 // Also test invalid surrogate pairs: | |
| 30 // (1) High surrogate not followed by low surrogate | |
| 31 test('\ud808', 1); | |
| 32 test('\ud808\u0000', 2); | |
| 33 // (2) Low surrogate not preceded by high surrogate | |
| 34 test('\udf45', 1); | |
| 35 test('\u0000\udf45', 2); | |
| 36 // (3) Low surrogate followed by high surrogate | |
| 37 test('\udf45\ud808', 2); | |
| 38 | |
| 39 test(new String(''), 0); | |
| 40 test(new String('abc'), 3); | |
| 41 test(new String('a \0 \ufffe \ufeff'), 7); | |
| 42 test(new String('\ud808\udf45'), 1); | |
| 43 test(new String('\ud808'), 1); | |
| 44 test(new String('\ud808\u0000'), 2); | |
| 45 test(new String('\udf45'), 1); | |
| 46 test(new String('\u0000\udf45'), 2); | |
| 47 test(new String('\udf45\ud808'), 2); |
