27 lines
583 B
Haskell
27 lines
583 B
Haskell
-- nice-frac.hs
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import Text.Pandoc.JSON
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import Text.Regex
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-- Usefull regex elements
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space :: String
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space = "[ \\t\\n\\r]*"
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num :: String
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num = "([0-9]+)"
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-- Replace fractions like "(42 / 1)" by "\frac{42}{1}"
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fracReg :: Regex
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fracReg = mkRegex $
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"\\(" ++ space ++ num ++ space ++ "/" ++ space ++ num ++ space ++ "\\)"
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frac :: String -> String
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frac s = subRegex fracReg s "\\\\frac{\\1}{\\2}"
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-- Apply the substitution to all Latex parts on the AST
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niceFrac :: Inline -> Inline
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niceFrac (Math t s) = Math t (frac s)
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niceFrac x = x
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main :: IO ()
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main = toJSONFilter niceFrac
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