haddock for iqm (so far) complete

src/Importer/IQM/Parser.hs

@@ -1,6 +1,9 @@
 {-# LANGUAGE RankNTypes #-}
 
-module Importer.IQM.Parser where
+-- | Parser for IQM-Files
+--
+--   Assumes that the file is stored with 32-Bit-BigEndian-Ints
+module Importer.IQM.Parser (parseIQM) where
 
 import Importer.IQM.Types
 import Data.Attoparsec.ByteString.Char8
@@ -16,14 +19,19 @@ import Control.Monad
 
 import Prelude as P hiding (take, null)
 
+-- | helper-function for creating an integral out of [8-Bit Ints]
 w8ToInt :: Integral a => a -> a -> a
 w8ToInt i add = 256*i + add
 
+-- | shorthand-function for parsing Word8 into Integrals
 parseNum :: (Integral a, Integral b) => [a] -> b
 parseNum = (foldl1 w8ToInt) . map fromIntegral
 
-int16 :: CParser Int16
-int16 = do
+-- | read a 16-Bit Int from Parsing-Input and log 2 bytes in our Parsing-Monad
+--
+--   begins with _ to defeat ghc-warnings. Rename if used!
+_int16 :: CParser Int16
+_int16 = do
         ret <- lift $ do
                          a <- anyWord8 :: Parser Word8
                          b <- anyWord8 :: Parser Word8
@@ -31,6 +39,7 @@ int16 = do
         modify (+2)
         return ret
 
+-- | read a 32-Bit Int from Parsing-Input and log 4 bytes in our Parsing-Monad
 int32 :: CParser Int32
 int32 = do
         ret <- lift $ do
@@ -42,6 +51,7 @@ int32 = do
         modify (+4)
         return $ ret
 
+-- | Parser for the header
 readHeader :: CParser IQMHeader
 readHeader = do
          _ <- lift $ string (pack "INTERQUAKEMODEL\0")
@@ -102,6 +112,7 @@ readHeader = do
                 , ofs_extensions     = ofs_extensions'
                 }
 
+-- | Parser for Mesh-Structure
 readMesh :: CParser IQMMesh
 readMesh = do
         name <- int32
@@ -119,6 +130,7 @@ readMesh = do
                 , meshNumTriangles      = nt
                 }
 
+-- | helper to read n consecutive Meshes tail-recursive
 readMeshes :: Int -> CParser [IQMMesh]
 readMeshes 1 = do
         m <- readMesh
@@ -128,6 +140,8 @@ readMeshes n = do
         ms <- readMeshes (n-1)
         return $ m:ms
 
+-- | helper-Notation for subtracting 2 integral values of different kind in the precision
+--   of the target-kind
 (.-) :: forall a a1 a2.
               (Num a, Integral a2, Integral a1) =>
               a1 -> a2 -> a
@@ -135,21 +149,26 @@ readMeshes n = do
 
 infix 5 .-
 
+-- | skips (=drops) all input until the internal counter is at a given bytecount
+--
+--   Fails the parser if given bytecount is lower than the internal counter as we
+--   read sequentially and do not do backtracking
 skipToCounter :: Integral a => a -> CParser ()
 skipToCounter a = do
                         let d = fromIntegral a
-			c <- get
+                        c <- get
                         when (d < c) $ fail "wanting to skip to counter already passed"
-			_ <- lift $ take $ d .- c
-			put d
+                        _ <- lift $ take $ d .- c
+                        put d
 
+-- | Parses an IQM-File and handles back the Haskell-Structure
 parseIQM :: CParser IQM
 parseIQM = do
-        put 0 							--start at offset 0
-        h <- readHeader						--read header
-        skipToCounter $ ofs_text h				--skip 0-n bytes to get to text
+        put 0                                                   --start at offset 0
+        h <- readHeader                                         --read header
+        skipToCounter $ ofs_text h                              --skip 0-n bytes to get to text
         text <- lift . take . fromIntegral $ num_text h         --read texts
-	modify . (+) . fromIntegral $ num_text h                --put offset forward
+        modify . (+) . fromIntegral $ num_text h                --put offset forward
         skipToCounter $ ofs_meshes h                            --skip 0-n bytes to get to meshes
         meshes' <- readMeshes (fromIntegral (num_meshes h))     --read meshes
         return IQM