Bob Nystrom
c3d0b66630
Add `byteAt(index)`, `codePointAt(index)`, and `bytes` sequence to String, enabling direct byte-level manipulation of UTF-8 encoded strings. Introduce `\x` hex escape sequence in string literals for specifying raw byte values. Refactor Unicode escape parsing into a generic `readHexEscape` function supporting variable digit counts. Implement `wrenUtf8Decode` utility for decoding UTF-8 sequences from byte buffers. Add comprehensive tests for `byteAt` including boundary conditions and error cases.
39 lines
1.3 KiB
Plaintext
39 lines
1.3 KiB
Plaintext
// Bytes: 11111
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// 012345678901234
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// Chars: sø mé ஃ thî ng
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var s = "søméஃthîng"
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IO.print(s.byteAt(0)) // expect: 115
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IO.print(s.byteAt(1)) // expect: 195
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IO.print(s.byteAt(2)) // expect: 184
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IO.print(s.byteAt(3)) // expect: 109
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IO.print(s.byteAt(4)) // expect: 195
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IO.print(s.byteAt(5)) // expect: 169
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IO.print(s.byteAt(6)) // expect: 224
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IO.print(s.byteAt(7)) // expect: 174
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IO.print(s.byteAt(8)) // expect: 131
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IO.print(s.byteAt(9)) // expect: 116
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IO.print(s.byteAt(10)) // expect: 104
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IO.print(s.byteAt(11)) // expect: 195
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IO.print(s.byteAt(12)) // expect: 174
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IO.print(s.byteAt(13)) // expect: 110
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IO.print(s.byteAt(14)) // expect: 103
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IO.print(s.byteAt(-15)) // expect: 115
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IO.print(s.byteAt(-14)) // expect: 195
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IO.print(s.byteAt(-13)) // expect: 184
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IO.print(s.byteAt(-12)) // expect: 109
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IO.print(s.byteAt(-11)) // expect: 195
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IO.print(s.byteAt(-10)) // expect: 169
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IO.print(s.byteAt(-9)) // expect: 224
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IO.print(s.byteAt(-8)) // expect: 174
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IO.print(s.byteAt(-7)) // expect: 131
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IO.print(s.byteAt(-6)) // expect: 116
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IO.print(s.byteAt(-5)) // expect: 104
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IO.print(s.byteAt(-4)) // expect: 195
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IO.print(s.byteAt(-3)) // expect: 174
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IO.print(s.byteAt(-2)) // expect: 110
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IO.print(s.byteAt(-1)) // expect: 103
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IO.print("\0".byteAt(0)) // expect: 0
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