42 lines
1.2 KiB
Haskell
42 lines
1.2 KiB
Haskell
{-# OPTIONS_HADDOCK ignore-exports #-}
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module Parser.Meshparser (meshToArr, facesToArr) where
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import Control.Applicative
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import Data.Attoparsec.ByteString.Char8
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import Data.Either
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import qualified Data.ByteString.Char8 as B
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import Diagrams.TwoD.Types
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-- |Convert a text String with multiple vertices and faces into
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-- a list of vertices, ordered by the faces specification.
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facesToArr :: B.ByteString -> [[P2 Double]]
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facesToArr str = fmap (fmap (\y -> meshToArr str !! (fromIntegral y - 1)))
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(faces str)
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where
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faces = rights . fmap (parseOnly parseFace) . B.lines
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-- |Convert a text String with multiple vertices into
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-- an array of float tuples.
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meshToArr :: B.ByteString -- ^ the string to convert
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-> [P2 Double] -- ^ the resulting vertice table
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meshToArr =
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fmap p2
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. rights
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. fmap (parseOnly parseVertice)
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. B.lines
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-- |Creates a Parser that accepts a single vertice, such as 'v 1.0 2.0'.
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parseVertice :: Parser (Double, Double)
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parseVertice =
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(,)
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<$> (char 'v' *> many' space *> double)
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<*> (many' space *> double)
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parseFace :: Parser [Integer]
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parseFace = char 'f' *> many1' (many' space *> decimal)
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