167429501b
This PR defines `String.Slice.replace` and redefines `String.replace` to use the `Slice` version. The new implementation is generic in the pattern, so it supports things like `"education".replace isVowel "☃!" = "☃!d☃!c☃!t☃!☃!n"`. Since it uses the `ForwardSearcher` infrastructure, `String` patterns are searched using KMP, unlike the previous implementation which had quadratic runtime. As a side effect, the behavior when replacing an empty string now matches that of most other programming languages, namely `"abc".replace "" "k" = "kakbkck"`.
21 lines
1 KiB
Text
21 lines
1 KiB
Text
module
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def isVowel (c : Char) : Bool :=
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c == 'a' || c == 'e' || c == 'i' || c == 'o' || c == 'u'
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#guard "education".replace isVowel "☃!" = "☃!d☃!c☃!t☃!☃!n"
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#guard "red green blue".replace "e" "" = "rd grn blu"
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#guard "red green blue".replace 'e' "" = "rd grn blu"
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#guard "red green blue".replace "ee" "E" = "red grEn blue"
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#guard "red green blue".replace "e" "E" = "rEd grEEn bluE"
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#guard "abc".replace "" "k" = "kakbkck"
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#guard "ℕ".replace "" "z" = "zℕz"
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#guard "𝔸".replace "" "z" = "z𝔸z"
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#guard "v̂".replace "" "z" = "zvẑz"
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#guard "aaaaa".replace "aa" "b" = "bba"
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#guard "v̂fℚo".replace ("ℕfℚoℤ".toSlice.drop 1 |>.dropEnd 1) ("☃🔭🌌".toSlice.dropEnd 1 |>.drop 1) = "v̂🔭"
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#guard ("abcde".toSlice.drop 1).replace (· == 'c') "C" = "bCde"
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#guard (("ac bc cc cd".toSlice.split " ").map (·.replace 'c' "C") |>.toList) = ["aC", "bC", "CC", "Cd"]
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#guard "red green blue".replace (fun c => c == 'u' || c == 'e') "" = "rd grn bl"
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#guard "aab".replace "ab" "X" = "aX"
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#guard " ℚℚ\n ".replace "ℚ\n" "\n" = " ℚ\n "
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