29 lines
1,007 B
Text
29 lines
1,007 B
Text
def showChars : Nat → String → String.Pos → IO Unit
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| 0, _, _ => pure ()
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| n+1, s, idx => do
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unless s.atEnd idx do
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IO.println (">> " ++ toString (s.get idx)) *>
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showChars n s (s.next idx)
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def main : IO UInt32 :=
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let s₁ := "hello α_world_β";
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let b : String.Pos := 0;
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let e := s₁.endPos;
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IO.println (s₁.extract b e) *>
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IO.println (s₁.extract (b+ " ") e) *>
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IO.println (s₁.extract (b+ " ") (e-⟨1⟩)) *>
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IO.println (s₁.extract (b+⟨2⟩) (e-⟨2⟩)) *>
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IO.println (s₁.extract (b+⟨7⟩) e) *>
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IO.println (s₁.extract (b+⟨8⟩) e) *>
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IO.println (toString e) *>
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IO.println (repr " aaa ".trim) *>
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showChars s₁.length s₁ 0 *>
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IO.println ("abc".isPrefixOf "abcd") *>
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IO.println ("abcd".isPrefixOf "abcd") *>
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IO.println ("".isPrefixOf "abcd") *>
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IO.println ("".isPrefixOf "") *>
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IO.println ("ab".isPrefixOf "cb") *>
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IO.println ("ab".isPrefixOf "a") *>
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IO.println ("αb".isPrefixOf "αbc") *>
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IO.println ("\x00a").length *>
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pure 0
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