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58e4d26648
Get rid of the separate opt-in IO class and replace it with a core System class. - Remove wren_io.c, wren_io.h, and io.wren. - Remove the flags that disable it. - Remove the overloads for print() with different arity. (It was an experiment, but I don't think it's that useful.) - Remove IO.read(). That will reappear using libuv in the CLI at some point. - Remove IO.time. Doesn't seem to have been used. - Update all of the tests, docs, etc. I'm sorry for all the breakage this causes, but I think "System" is a better name for this class (it makes it natural to add things like "System.gc()") and frees up "IO" for referring to the CLI's IO module.
50 lines
1.7 KiB
Plaintext
50 lines
1.7 KiB
Plaintext
var string = "abcde"
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System.print(string[0..0]) // expect: a
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System.print(string[1...1] == "") // expect: true
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System.print(string[1..2]) // expect: bc
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System.print(string[1...2]) // expect: b
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System.print(string[2..4]) // expect: cde
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System.print(string[2...5]) // expect: cde
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// A backwards range reverses.
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System.print(string[3..1]) // expect: dcb
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System.print(string[3...1]) // expect: dc
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System.print(string[3...3] == "") // expect: true
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// Negative ranges index from the end.
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System.print(string[-5..-2]) // expect: abcd
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System.print(string[-5...-2]) // expect: abc
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System.print(string[-3..-5]) // expect: cba
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System.print(string[-3...-6]) // expect: cba
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// Half-negative ranges are treated like the negative value is fixed before
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// walking the range.
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System.print(string[-5..3]) // expect: abcd
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System.print(string[-3...5]) // expect: cde
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System.print(string[-2..1]) // expect: dcb
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System.print(string[-2...0]) // expect: dcb
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System.print(string[1..-2]) // expect: bcd
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System.print(string[2...-1]) // expect: cd
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System.print(string[4..-5]) // expect: edcba
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System.print(string[3...-6]) // expect: dcba
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// An empty range at zero is allowed on an empty string.
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System.print(""[0...0] == "") // expect: true
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System.print(""[0..-1] == "") // expect: true
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// Indexes by byte, not code point.
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//
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// Bytes: 11111
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// 012345678901234
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// Chars: sø mé ஃ thî ng
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System.print("søméஃthîng"[0..3]) // expect: søm
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System.print("søméஃthîng"[3...10]) // expect: méஃt
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// Only includes sequences whose first byte is in the range.
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System.print("søméஃthîng"[2..6]) // expect: méஃ
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System.print("søméஃthîng"[2...6]) // expect: mé
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System.print("søméஃthîng"[2...7]) // expect: méஃ
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// TODO: Strings including invalid UTF-8.
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