LayoutTests/fast/regex/script-tests/string-split-newline.js

description(
'This test checks the SIMD-optimized newline splitting patterns for correctness.'
);

// Test the optimized patterns: /\r\n?|\n/ and /\n|\r\n?/
// These patterns match LF (\n), CR (\r), and CRLF (\r\n)

var newlinePatterns = [/\r\n?|\n/, /\n|\r\n?/];
var newlineTypes = ["\\n", "\\r", "\\r\\n"];

newlinePatterns.forEach(function(pattern, patternIndex) {
    shouldBe(`"".split(newlinePatterns[${patternIndex}])`, '[""]');
    shouldBe(`"no newlines".split(newlinePatterns[${patternIndex}])`, '["no newlines"]');
    shouldBe(`"abc".split(newlinePatterns[${patternIndex}])`, '["abc"]');
    shouldBe(`"Line1\\r\\nLine2\\nLine3\\rLine4".split(newlinePatterns[${patternIndex}])`, '["Line1", "Line2", "Line3", "Line4"]');
    newlineTypes.forEach(function(nl) {
        shouldBe(`"${nl}".split(newlinePatterns[${patternIndex}])`, '["", ""]');
        shouldBe(`"${nl}text".split(newlinePatterns[${patternIndex}])`, '["", "text"]');
        shouldBe(`"a${nl}b".split(newlinePatterns[${patternIndex}])`, '["a", "b"]');
        shouldBe(`"a${nl}b${nl}c".split(newlinePatterns[${patternIndex}])`, '["a", "b", "c"]');
        shouldBe(`"text${nl}".split(newlinePatterns[${patternIndex}])`, '["text", ""]');
        shouldBe(`"${nl}${nl}".split(newlinePatterns[${patternIndex}])`, '["", "", ""]');
        shouldBe(`"a${nl}${nl}b".split(newlinePatterns[${patternIndex}])`, '["a", "", "b"]');
        shouldBe(`"a${nl}b${nl}c".split(newlinePatterns[${patternIndex}], 2)`, '["a", "b"]');
        shouldBe(`"a${nl}b${nl}".split(newlinePatterns[${patternIndex}], 2)`, '["a", "b"]');
        shouldBe(`"a${nl}b${nl}c${nl}".split(newlinePatterns[${patternIndex}], 3)`, '["a", "b", "c"]');
        shouldBe(`"This is a very long string that exceeds 32 chars to test vectorMatch in the SIMD-optimized function${nl}Second line".split(newlinePatterns[${patternIndex}])`, '["This is a very long string that exceeds 32 chars to test vectorMatch in the SIMD-optimized function", "Second line"]');
    });
});

/(test)(123)/.exec("test123");
shouldBe('RegExp.$1', '"test"');
shouldBe('RegExp.$2', '"123"');

"".split(/\r\n?|\n/);
shouldBe('RegExp.$1', '"test"');
shouldBe('RegExp.$2', '"123"');

"a\nb\nc".split(/\r\n?|\n/);
shouldBe('RegExp.$1', '""');
shouldBe('RegExp.$2', '""');

/(foo)(bar)/.exec("foobar");
shouldBe('RegExp.$1', '"foo"');
shouldBe('RegExp.$2', '"bar"');

"x\ny\nz".split(/\n|\r\n?/);
shouldBe('RegExp.$1', '""');
shouldBe('RegExp.$2', '""');

"hello\nworld".split(/\r\n?|\n/);
shouldBe('RegExp.lastMatch', '"\\n"');
"hello\r\nworld".split(/\r\n?|\n/);
shouldBe('RegExp.lastMatch', '"\\r\\n"');
"hello\rworld".split(/\r\n?|\n/);
shouldBe('RegExp.lastMatch', '"\\r"');