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wren/test/core/string/count.wren
Bob Nystrom 58e4d26648 "IO" -> "System".
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.
2015-09-15 07:46:09 -07:00

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System.print("".count) // expect: 0
System.print("a string".count) // expect: 8
// 8-bit clean.
System.print("\0".count) // expect: 1
System.print("a\0b".count) // expect: 3
System.print("\0c".count) // expect: 2
System.print(("a\0b" + "\0c").count) // expect: 5
// Treats a UTF-8 sequence as a single item.
//
// Bytes: 11111
// 012345678901234
// Chars: sø mé ஃ thî ng
System.print("søméஃthîng".count) // expect: 10
// Counts invalid UTF-8 one byte at a time.
System.print("\xefok\xf7".count) // expect: 4