forked from Mirror/wren
6845328661
- Simplify the arithmetic a little in wrenStringFind(). - Allow the start to be negative. - Even more tests. - Docs.
40 lines
1.6 KiB
Plaintext
40 lines
1.6 KiB
Plaintext
// An empty string is anywhere you look for it.
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System.print("abcd".indexOf("", 0)) // expect: 0
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System.print("abcd".indexOf("", 1)) // expect: 1
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System.print("abcd".indexOf("", 2)) // expect: 2
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// Overlapping results.
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System.print("aaaaa".indexOf("aaaa", 0)) // expect: 0
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System.print("aaaaa".indexOf("aaaa", 1)) // expect: 1
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System.print("aaaaa".indexOf("aaaa", 2)) // expect: -1
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// It's OK if the needle extends past the end.
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System.print("abcd".indexOf("abcde", 0)) // expect: -1
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System.print("abcd".indexOf("cde", 3)) // expect: -1
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System.print("abcd".indexOf("cd", 0)) // expect: 2
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System.print("abcd".indexOf("cd", 1)) // expect: 2
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System.print("abcd".indexOf("cd", 2)) // expect: 2
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System.print("abcd".indexOf("cd", 3)) // expect: -1
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// Negative start.
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System.print("abcd".indexOf("cd", -4)) // expect: 2
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System.print("abcd".indexOf("cd", -3)) // expect: 2
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System.print("abcd".indexOf("cd", -2)) // expect: 2
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System.print("abcd".indexOf("cd", -1)) // expect: -1
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// Skips past earlier results.
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System.print("here as well as here".indexOf("here", 1)) // expect: 16
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// Non-ASCII. Note that it returns byte indices, not code points.
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System.print("søméஃthîng".indexOf("e", 2)) // expect: -1
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System.print("søméஃthîng".indexOf("m", 2)) // expect: 3
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System.print("søméஃthîng".indexOf("thî", 8)) // expect: 9
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// 8-bit clean.
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System.print("a\0b\0c".indexOf("\0", 0)) // expect: 1
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System.print("a\0b\0c".indexOf("a", 0)) // expect: 0
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System.print("a\0b\0c".indexOf("b\0c", 1)) // expect: 2
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System.print("a\0b\0c".indexOf("a\0b\0c\0d", 0)) // expect: -1
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System.print("a\0b\0a\0b".indexOf("a\0b", 0)) // expect: 0
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