{-   `Deep Thought', a softcore CPU implemented on a FPGA

    Copyright (C) 2010 Markus Hofstaetter <markus.manrow@gmx.at>
    Copyright (C) 2010 Martin Perner <e0725782@student.tuwien.ac.at>
    Copyright (C) 2010 Stefan Rebernig <stefan.rebernig@gmail.com>
    Copyright (C) 2010 Manfred Schwarz <e0725898@student.tuwien.ac.at>
    Copyright (C) 2010 Bernhard Urban <lewurm@gmail.com>

    This program is free software: you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation, either version 3 of the License, or
    (at your option) any later version.

    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.

    You should have received a copy of the GNU General Public License
    along with this program.  If not, see <http://www.gnu.org/licenses/>. -}

module DTFormat where

import Numeric
import Data.Word
import Data.Char
import Text.Printf
import Text.Parsec
import Text.Parsec.String
import Text.Parsec.Combinator
import Text.Parsec.Expr
import Text.ParserCombinators.Parsec.Token
import Text.ParserCombinators.Parsec.Expr
import Control.Monad

data DT_State = NoState | InData | InText deriving (Show,Eq)

type Address = Word32
type Value = Word32
type Repeat = Word32
type ValueToParse = String
type Code = String
type Label = String
type Comment = String
type Ascii = String
type LineNo = Word32

data DTF =
	DTF_Data Address Value Code Label Comment | -- 0;...
	DTF_Instr Address Value Code Label Comment | -- 1;...
	DTF_Comment Comment | -- 2;...
	DTF_Label Label Comment Address | -- 3;...
	-- types for intern processing
	DTF_InstrToParse Address ValueToParse Code Label Comment LineNo |
	DTF_SectionToDet Address Value Code Label Comment |
	DTF_Org Address |
	DTF_Define Label Value Comment |
	DTF_Fill Repeat Value Label Code Comment |
	DTF_Ascii String Label Code Comment |
	DTF_State DT_State

instance Show (DTF) where
	showsPrec n = showsDTF

showsDTF :: DTF -> ShowS
showsDTF (DTF_Data a v c l s) = (++) (datins "0" a v c l s)
showsDTF (DTF_Instr a v c l s) = (++) (datins "1" a v c l s)
showsDTF (DTF_Comment c) = (++) (printf "2;%s\n" c)
showsDTF (DTF_Label l c _) = (++) (printf "3;%s;%s\n" l c)
showsDTF (DTF_InstrToParse a v c l s lno) = (++) (printf "itp;%08x;%s;%s;%s;%s@%d\n" a v c l s lno)
showsDTF (DTF_SectionToDet a v c l s) = (++) (datins "std" a v c l s)
showsDTF (DTF_Org a) = (++) (printf "org;%08x\n" a)
showsDTF (DTF_Define l a c) = (++) (printf "def;%s;%08x;%s\n" l a c)
showsDTF (DTF_Fill r v code l c) = (++) (printf "fill;%08x;%08x;%s;%s;%s\n" r v code l c)
showsDTF (DTF_Ascii str l code c) = (++) (printf "ascii;%s;%s;%s;%s" str code l c)
showsDTF (DTF_State s) = (++) (printf "sta;%s\n" (show s))

datins :: String -> Address -> Value -> Code -> Label -> Comment -> String
datins = printf "%s;%08x;%08x;%s;%s;%s\n"

tobin :: Value -> String
tobin v = reverse $ take 32 $ reverse $ (['0' | _<-[0..32]]) ++ (showIntAtBase 2 (chr. ((+)0x30)) v "")

showsDTFBase :: DTF -> Int -> ShowS
showsDTFBase (DTF_Data a v c l s) 2 = (++) (datinsBin "0" a (tobin v) c l s)
showsDTFBase (DTF_Instr a v c l s) 2 = (++) (datinsBin "1" a (tobin v) c l s)
showsDTFBase d _ = showsDTF d

datinsBin :: String -> Address -> String -> Code -> Label -> Comment -> String
datinsBin = printf "%s;%08x;%s;%s;%s;%s\n"

-- datastructure for managing labels and defines
type Dict = (Address,[DictElem])
type DictElem = (String,Word32)

get_elem :: String -> [DictElem] -> Word32
get_elem s dict = case (lookup s dict) of
		Nothing -> error ("unknown label or define: \"" ++ s ++ "\"")
		Just z -> z

add_elem :: [DictElem] -> (String,Word32) -> [DictElem]
add_elem dic (s,w)
	| s == "" = dic -- ignore empty string
	| already_in =  error ("Label or define \"" ++ s ++ "\" already exists")
	| otherwise = (s,w):dic
	where
	already_in = case (lookup s dic) of
		Just _ -> True
		Nothing -> False

-- some common functions
parseMySpaces :: Parser String
parseMySpaces = do
	ret <- many $ oneOf "\t "
	return $ ret