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Diffstat (limited to '')
-rw-r--r-- | js/src/jit-test/tests/cacheir/string-at.js | 115 |
1 files changed, 115 insertions, 0 deletions
diff --git a/js/src/jit-test/tests/cacheir/string-at.js b/js/src/jit-test/tests/cacheir/string-at.js new file mode 100644 index 0000000000..8dfb2f779e --- /dev/null +++ b/js/src/jit-test/tests/cacheir/string-at.js @@ -0,0 +1,115 @@ +// Test String.prototype.at with negative and non-negative indices. + +function* characters(...ranges) { + for (let [start, end] of ranges) { + for (let i = start; i <= end; ++i) { + yield i; + } + } +} + +const empty = []; + +const ascii = [...characters( + [0x41, 0x5A], // A..Z + [0x61, 0x7A], // a..z +)]; + +const latin1 = [...characters( + [0xC0, 0xFF], // À..ÿ +)]; + +const twoByte = [...characters( + [0x100, 0x17E], // Ā..ž +)]; + +function atomize(s) { + return Object.keys({[s]: 0})[0]; +} + +function codePoints() { + return [empty, ascii, latin1, twoByte]; +} + +function toRope(s) { + // Ropes have at least two characters. + if (s.length < 2) { + return s; + } + if (s.length === 2) { + return newRope(s[0], s[1]); + } + return newRope(s[0], s.substring(1)); +} + +function makeStrings() { + let strings = codePoints() + .map(codePoints => String.fromCodePoint(...codePoints)) + .flatMap(x => [ + x, + toRope(x), + newString(x, {twoByte: true}), + atomize(x), + ]); + return strings; +} + +function testNonNegativeIndexConstant() { + let strings = makeStrings(); + for (let i = 0; i < 200; ++i) { + let str = strings[i % strings.length]; + let index = 0; + let ch = str.at(index); + let expected = str.charAt(index); + if (expected === "") expected = undefined; + assertEq(ch, expected); + } +} +for (let i = 0; i < 2; ++i) { + testNonNegativeIndexConstant(); +} + +function testNonNegativeIndex() { + let strings = makeStrings(); + for (let i = 0; i < 200; ++i) { + let str = strings[i % strings.length]; + let index = i & 3; + let ch = str.at(index); + let expected = str.charAt(index); + if (expected === "") expected = undefined; + assertEq(ch, expected); + } +} +for (let i = 0; i < 2; ++i) { + testNonNegativeIndex(); +} + +function testNegativeIndexConstant() { + let strings = makeStrings(); + for (let i = 0; i < 200; ++i) { + let str = strings[i % strings.length]; + let index = -1; + let ch = str.at(index); + let expected = str.charAt(str.length + index); + if (expected === "") expected = undefined; + assertEq(ch, expected); + } +} +for (let i = 0; i < 2; ++i) { + testNegativeIndexConstant(); +} + +function testNegativeIndex() { + let strings = makeStrings(); + for (let i = 0; i < 200; ++i) { + let str = strings[i % strings.length]; + let index = -(i & 3) - 1; + let ch = str.at(index); + let expected = str.charAt(str.length + index); + if (expected === "") expected = undefined; + assertEq(ch, expected); + } +} +for (let i = 0; i < 2; ++i) { + testNegativeIndex(); +} |