diff options
| author | Alexander Krotov <ilabdsf@gmail.com> | 2017-02-15 02:00:23 +0400 |
|---|---|---|
| committer | John MacFarlane <jgm@berkeley.edu> | 2017-02-14 23:00:23 +0100 |
| commit | a58112f6bcd3b30a942d5afad2ee5a8b9db367ac (patch) | |
| tree | 6e4dd31eb3ef131fc357e5769a7ea5049544657d /src | |
| parent | 2a3c2b01ea0e07151629ffb7535a0cdf0525858e (diff) | |
Simplify toRomanNumeral using guards (#3445)
Diffstat (limited to 'src')
| -rw-r--r-- | src/Text/Pandoc/Shared.hs | 34 |
1 files changed, 16 insertions, 18 deletions
diff --git a/src/Text/Pandoc/Shared.hs b/src/Text/Pandoc/Shared.hs index 86e9a5525..268a5052e 100644 --- a/src/Text/Pandoc/Shared.hs +++ b/src/Text/Pandoc/Shared.hs @@ -261,24 +261,22 @@ camelCaseToHyphenated (a:rest) = (toLower a):(camelCaseToHyphenated rest) -- | Convert number < 4000 to uppercase roman numeral. toRomanNumeral :: Int -> String -toRomanNumeral x = - if x >= 4000 || x < 0 - then "?" - else case x of - _ | x >= 1000 -> "M" ++ toRomanNumeral (x - 1000) - _ | x >= 900 -> "CM" ++ toRomanNumeral (x - 900) - _ | x >= 500 -> "D" ++ toRomanNumeral (x - 500) - _ | x >= 400 -> "CD" ++ toRomanNumeral (x - 400) - _ | x >= 100 -> "C" ++ toRomanNumeral (x - 100) - _ | x >= 90 -> "XC" ++ toRomanNumeral (x - 90) - _ | x >= 50 -> "L" ++ toRomanNumeral (x - 50) - _ | x >= 40 -> "XL" ++ toRomanNumeral (x - 40) - _ | x >= 10 -> "X" ++ toRomanNumeral (x - 10) - _ | x == 9 -> "IX" - _ | x >= 5 -> "V" ++ toRomanNumeral (x - 5) - _ | x == 4 -> "IV" - _ | x >= 1 -> "I" ++ toRomanNumeral (x - 1) - _ -> "" +toRomanNumeral x + | x >= 4000 || x < 0 = "?" + | x >= 1000 = "M" ++ toRomanNumeral (x - 1000) + | x >= 900 = "CM" ++ toRomanNumeral (x - 900) + | x >= 500 = "D" ++ toRomanNumeral (x - 500) + | x >= 400 = "CD" ++ toRomanNumeral (x - 400) + | x >= 100 = "C" ++ toRomanNumeral (x - 100) + | x >= 90 = "XC" ++ toRomanNumeral (x - 90) + | x >= 50 = "L" ++ toRomanNumeral (x - 50) + | x >= 40 = "XL" ++ toRomanNumeral (x - 40) + | x >= 10 = "X" ++ toRomanNumeral (x - 10) + | x == 9 = "IX" + | x >= 5 = "V" ++ toRomanNumeral (x - 5) + | x == 4 = "IV" + | x >= 1 = "I" ++ toRomanNumeral (x - 1) + | otherwise = "" -- | Escape whitespace and some punctuation characters in URI. escapeURI :: String -> String |