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45 lines
1.5 KiB
45 lines
1.5 KiB
{-# LANGUAGE OverloadedStrings #-}
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module Main where
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import qualified Data.Text.Lazy.IO as Text
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import qualified Data.Text.Lazy as Text
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import Data.Text.Lazy (Text)
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import Text.HTML.TagSoup
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import System.Environment
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import Control.Exception
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import Data.Maybe
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main :: IO ()
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main = do
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[file] <- getArgs
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tags <- parseTags <$> Text.readFile file
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evaluate (length tags)
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Text.writeFile file (renderTags (hideSteps False tags))
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hideSteps :: Bool -> [Tag Text] -> [Tag Text]
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hideSteps has_eqn (to@(TagOpen "a" attrs):tt@(TagText t):tc@(TagClose "a"):rest)
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| Text.length t >= 1, Text.last t == '⟨', Just href <- lookup "href" attrs =
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[ TagOpen "span" [("class", "reasoning-step")]
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, TagOpen "span" [("class", "as-written " <> fromMaybe "" (lookup "class" attrs))]
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, to, tt, tc ] ++ go href rest
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where
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alternate = Text.init t
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go href (to@(TagOpen "a" attrs):tt@(TagText t):tc@(TagClose "a"):cs)
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| Text.length t >= 1
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, Text.head t == '⟩'
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, Just href' <- lookup "href" attrs
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, href' == href
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= [ to, tt, tc, TagClose "span"
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, TagOpen "span" [("class", "alternate " <> fromMaybe "" (lookup "class" attrs))]
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, TagText alternate
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, TagClose "span"
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, TagClose "span"
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] ++ hideSteps True cs
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go href (c:cs) = c:go href cs
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go _ [] = []
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hideSteps False (TagClose "html":cs) =
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[TagOpen "style" [], TagText ".equations { display: none !important; }", TagClose "style", TagClose "html"]
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++ hideSteps True cs
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hideSteps has_eqn (c:cs) = c:hideSteps has_eqn cs
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hideSteps _ [] = []
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