fa5d08b7de
This PR redefines `String.take` and variants to operate on `String.Slice`. While previously functions returning a substring of the input sometimes returned `String` and sometimes returned `Substring.Raw`, they now uniformly return `String.Slice`. This is a BREAKING change, because many functions now have a different return type. So for example, if `s` is a string and `f` is a function accepting a string, `f (s.drop 1)` will no longer compile because `s.drop 1` is a `String.Slice`. To fix this, insert a call to `copy` to restore the old behavior: `f (s.drop 1).copy`. Of course, in many cases, there will be more efficient options. For example, don't write `f <| s.drop 1 |>.copy |>.dropEnd 1 |>.copy`, write `f <| s.drop 1 |>.dropEnd 1 |>.copy` instead. Also, instead of `(s.drop 1).copy = "Hello"`, write `s.drop 1 == "Hello".toSlice` instead.
64 lines
2.2 KiB
Text
64 lines
2.2 KiB
Text
def f (s : String) : String :=
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s ++ " " ++ s
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def g (s : String) : String :=
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s.push ' ' ++ s.push '-'
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def h (s : String) : String :=
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let it₁ := s.mkIterator;
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let it₂ := it₁.next;
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it₁.remainingToString ++ "-" ++ it₂.remainingToString
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#eval "hello" ++ "hello"
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#eval f "hello"
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#eval (f "αβ").length
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#eval "hello".toList
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#eval "αβ".toList
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#eval "".toList
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#eval "αβγ".toList
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#eval "αβγ".mkIterator.1
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#eval "αβγ".mkIterator.next.1
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#eval "αβγ".mkIterator.next.next.1
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#eval "αβγ".mkIterator.next.2
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#eval "αβ".data
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#eval "αβ".push 'a'
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#eval g "α"
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#eval "".mkIterator.curr
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#eval ("αβγ".mkIterator.setCurr 'a').toString
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#eval (("αβγ".mkIterator.setCurr 'a').next.setCurr 'b').toString
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#eval ((("αβγ".mkIterator.setCurr 'a').next.setCurr 'b').next.setCurr 'c').toString
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#eval ((("αβγ".mkIterator.setCurr 'a').next.setCurr 'b').prev.setCurr 'c').toString
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#eval ("abc".mkIterator.setCurr '0').toString
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#eval (("abc".mkIterator.setCurr '0').next.setCurr '1').toString
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#eval ((("abc".mkIterator.setCurr '0').next.setCurr '1').next.setCurr '2').toString
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#eval ((("abc".mkIterator.setCurr '0').next.setCurr '1').prev.setCurr '2').toString
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#eval ("abc".mkIterator.setCurr (Char.ofNat 955)).toString
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#eval h "abc"
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#eval "abc".mkIterator.remainingToString
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#eval ("a".push (Char.ofNat 0)) ++ "bb"
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#eval (("a".push (Char.ofNat 0)) ++ "αb").length
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#eval "".mkIterator.hasNext
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#eval "a".mkIterator.hasNext
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#eval "a".mkIterator.next.hasNext
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#eval "".mkIterator.hasPrev
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#eval "a".mkIterator.next.hasPrev
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#eval "αβ".mkIterator.next.hasPrev
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#eval "αβ".mkIterator.next.prev.hasPrev
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#eval "abc" == "abc"
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#eval "abc" == "abd"
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#eval "αβγ".drop 1 |>.copy
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#eval "αβγ".takeRight 1
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def ss : Substring.Raw := "0123abcdαβγδ".toRawSubstring
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#eval ss.drop 4 |>.takeRight 4
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#eval ss.drop 4 |>.take 4
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#eval ss.dropRight 4 |>.takeRight 4
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def ssDots : Substring.Raw := "____abc.αβγ.123.____".toRawSubstring.extract ⟨4⟩ ⟨19⟩
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#eval ssDots.splitOn "."
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def ssHyphs : Substring.Raw := "____abc--αβγ--123--____".toRawSubstring.extract ⟨4⟩ ⟨22⟩
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#eval ssHyphs.splitOn "--"
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#eval "αβγ".get' 0 (by decide)
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#eval "αβγ".get' ⟨2⟩ (by decide)
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#eval "αβγ".next' ⟨2⟩ (by decide)
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