{-# LANGUAGE TypeSynonymInstances, FlexibleInstances #-}

{- |

Module : $Header$

Description : Printer for abstract syntax of CSL

Copyright : (c) Dominik Dietrich, Ewaryst Schulz, DFKI Bremen 2010

License : GPLv2 or higher, see LICENSE.txt

Maintainer : Ewaryst.Schulz@dfki.de

Stability : experimental

Portability : portable

Pretty printing the abstract syntax of CSL.

-}

module CSL.Print_AS

( printExpression

, printCMD

, printAssDefinition

, printConstantName

, ExpressionPrinter (..)

, toArgList

) where

import Common.Id as Id

import Common.Doc

import Common.DocUtils

import Control.Monad

import Control.Monad.Reader

import Numeric

import CSL.AS_BASIC_CSL

import CSL.TreePO

-- * Pretty Printing

instance Pretty InfInt where

pretty = printInfInt

instance Pretty GroundConstant where

pretty = printGC

instance Pretty a => Pretty (SetOrInterval a) where

pretty = printDomain

instance Pretty EP_item where

pretty = printEPDecl

instance Pretty EPComponent where

pretty = printEPComponent

instance Pretty OP_ITEM where

pretty = printOpItem

instance Pretty VAR_ITEM where

pretty = printVarItem

instance Pretty BASIC_SPEC where

pretty = printBasicSpec

instance Pretty BASIC_ITEM where

pretty = printBasicItems

instance Pretty EXTPARAM where

pretty = printExtparam

instance Pretty EXPRESSION where

pretty = head . printExpression

instance Pretty SYMB_ITEMS where

pretty = printSymbItems

instance Pretty SYMB where

pretty = printSymbol

instance Pretty SYMB_MAP_ITEMS where

pretty = printSymbMapItems

instance Pretty SYMB_OR_MAP where

pretty = printSymbOrMap

instance Pretty CMD where

pretty = head . printCMD

instance Pretty ConstantName where

pretty = printConstantName

instance Pretty AssDefinition where

pretty = head . printAssDefinition

instance Pretty OPID where

pretty = head . printOPID

-- | A monad for printing of constants. This turns the pretty printing facility

-- more flexible w.r.t. the output of 'ConstantName'.

class Monad m => ExpressionPrinter m where

getOINM :: m OpInfoNameMap

getOINM = return operatorInfoNameMap

printConstant :: ConstantName -> m Doc

printConstant = return . printConstantName

printOpname :: OPNAME -> m Doc

printOpname = return . text . showOPNAME

prefixMode :: m Bool

prefixMode = return False

printArgs :: [Doc] -> m Doc

printArgs = return . parens . sepByCommas

printVarDecl :: String -> m Doc

printVarDecl = return . text

printInterval :: Double -> Double -> m Doc

printInterval l r =

return $ brackets $ sepByCommas $ map (text . show) [l, r]

printRational :: APFloat -> m Doc

printRational r = return $ text $ showFloat ((fromRat r) :: Double) ""

-- | The default ConstantName printer

printConstantName :: ConstantName -> Doc

printConstantName (SimpleConstant s) = text s

printConstantName (ElimConstant s i) =

text $ if i > 0 then s ++ "__" ++ show i else s

printAssDefinition :: ExpressionPrinter m => AssDefinition -> m Doc

printAssDefinition (ConstDef e) = printExpression e >>= return . (text "=" <+>)

printAssDefinition (FunDef l e) = do

ed <- printExpression e

l' <- mapM printVarDecl l

args <- printArgs l'

return $ args <+> text "=" <+> ed

printOPID :: ExpressionPrinter m => OPID -> m Doc

printOPID (OpUser c) = printConstant c

printOPID (OpId oi) = printOpname oi

-- a dummy instance, we take the simplest monad

instance ExpressionPrinter []

-- | An 'OpInfoNameMap' can be interpreted as an 'ExpressionPrinter'

instance ExpressionPrinter (Reader OpInfoNameMap) where

getOINM = ask

printCMD :: ExpressionPrinter m => CMD -> m Doc

printCMD (Ass c def) = do

[c', def'] <- mapM printExpression [c, def]

return $ c' <+> text ":=" <+> def'

printCMD c@(Cmd s exps) -- TODO: remove the case := later

| s == ":=" = error $ "printCMD: use Ass for assignment representation! "

++ show c

| s == "constraint" = printExpression (exps !! 0)

| otherwise = let f l = text s <> parens (sepByCommas l)

in liftM f $ mapM printExpression exps

printCMD (Repeat e stms) = do

e' <- printExpression e

let f l = text "re" <>

(text "peat" $+$ vcat (map (text "." <+>) l))

$+$ text "until" <+> e'

liftM f $ mapM printCMD stms

printCMD (Sequence stms) =

let f l = text "se" <> (text "quence" $+$ vcat (map (text "." <+>) l))

$+$ text "end"

in liftM f $ mapM printCMD stms

printCMD (Cond l) = let f l' = vcat l' $+$ text "end"

in liftM f $ mapM (uncurry printCase) l

printCase :: ExpressionPrinter m => EXPRESSION -> [CMD] -> m Doc

printCase e l = do

e' <- printExpression e

let f l' = text "ca" <> (text "se" <+> e' <> text ":"

$+$ vcat (map (text "." <+>) l'))

liftM f $ mapM printCMD l

getPrec :: OpInfoNameMap -> EXPRESSION -> Int

getPrec oinm (Op s _ exps _)

| length exps == 0 = maxPrecedence + 1

| otherwise =

case lookupOpInfo oinm s $ length exps of

Right oi -> prec oi

Left True -> error $

concat [ "getPrec: registered operator ", show s, " used "

, "with non-registered arity ", show $ length exps ]

_ -> maxPrecedence -- this is probably a user-defined prefix function

-- , binds strongly

getPrec _ _ = maxPrecedence

getOp :: EXPRESSION -> Maybe OPID

getOp (Op s _ _ _) = Just s

getOp _ = Nothing

printExtparam :: EXTPARAM -> Doc

printExtparam (EP p op i) =

pretty p <> text op <> (if op == "-|" then empty else text $ show i)

printExtparams :: [EXTPARAM] -> Doc

printExtparams [] = empty

printExtparams l = brackets $ sepByCommas $ map printExtparam l

printInfix :: ExpressionPrinter m => EXPRESSION -> m Doc

printInfix e@(Op s _ exps@[e1, e2] _) = do

-- we mustn't omit the space between the operator and its arguments for text-

-- operators such as "and", "or", but it would be good to omit it for "+-*/"

oi <- printOPID s

oinm <- getOINM

let outerprec = getPrec oinm e

f cmp e' ed = if cmp outerprec $ getPrec oinm e' then ed else parens ed

g [ed1, ed2] = let cmp = case getOp e1 of

Just op1 | op1 == s -> (<=)

| otherwise -> (<)

_ -> (<)

in sep[f cmp e1 ed1, oi <+> f (<) e2 ed2]

g _ = error "printInfix: Inner impossible case"

liftM g $ mapM printExpression exps

printInfix _ = error "printInfix: Impossible case"

printExpression :: ExpressionPrinter m => EXPRESSION -> m Doc

printExpression (Var token) = return $ text $ tokStr token

printExpression e@(Op s epl exps _)

| length exps == 0 = liftM (<> printExtparams epl) $ printOPID s

| otherwise = do

let asPrfx pexps = do

oid <- printOPID s

args <- printArgs pexps

return $ oid <> printExtparams epl <> args

asPrfx' = mapM printExpression exps >>= asPrfx

oinm <- getOINM

pfxMode <- prefixMode

if pfxMode then asPrfx' else

case lookupOpInfo oinm s $ length exps of

Right oi

| infx oi -> printInfix e

| otherwise -> asPrfx'

_ -> asPrfx'

printExpression (List exps _) = liftM sepByCommas (mapM printExpression exps)

printExpression (Int i _) = return $ text (show i)

printExpression (Rat r _) = printRational r

printExpression (Interval l r _) = printInterval l r

printOpItem :: OP_ITEM -> Doc

printOpItem (Op_item tokens _) =

text "operator" <+> sepByCommas (map pretty tokens)

printVarItem :: VAR_ITEM -> Doc

printVarItem (Var_item vars dom _) =

hsep [sepByCommas $ map pretty vars, text "in", pretty dom]

printEPComponent :: EPComponent -> Doc

printEPComponent (EPDomain n epd) = pretty n <+> text "in" <+> printDomain epd

printEPComponent (EPDefault n dv) = pretty n <+> text "default=" <+> pretty dv

printEPComponent (EPSimple n) = pretty n

printEPDecl :: EP_item -> Doc

printEPDecl (EP_item tk mDom mDef) =

let tkD = pretty tk

domD = case mDom of

Just dom -> hsep [tkD, text "in", pretty dom]

_ -> tkD

in case mDef of

Just def -> sepBySemis [domD, hsep [tkD, text "default=", pretty def]]

_ -> domD

printDomain :: Pretty a => SetOrInterval a -> Doc

printDomain (Set s) = pretty s

printDomain (IntVal (c1, b1) (c2, b2)) =

hcat [ getIBorder True b1, sepByCommas $ map pretty [c1, c2]

, getIBorder False b2]

getIBorder :: Bool -> Bool -> Doc

getIBorder False False = lbrack

getIBorder True True = lbrack

getIBorder _ _ = rbrack

printGC :: GroundConstant -> Doc

printGC (GCI i) = text (show i)

printGC (GCR d) = text (show d)

printInfInt :: InfInt -> Doc

printInfInt NegInf = text "-oo"

printInfInt PosInf = text "oo"

printInfInt (FinInt x) = text $ show x

printBasicSpec :: BASIC_SPEC -> Doc

printBasicSpec (Basic_spec xs) = vcat $ map pretty xs

printBasicItems :: BASIC_ITEM -> Doc

printBasicItems (Axiom_item x) = pretty x

printBasicItems (Op_decl x) = pretty x

printBasicItems (Var_decls x) = text "vars" <+> (sepBySemis $ map pretty x)

printBasicItems (EP_components x) = text "eps" <+> (sepBySemis $ map pretty x)

printSymbol :: SYMB -> Doc

printSymbol (Symb_id sym) = pretty sym

printSymbItems :: SYMB_ITEMS -> Doc

printSymbItems (Symb_items xs _) = fsep $ map pretty xs

printSymbOrMap :: SYMB_OR_MAP -> Doc

printSymbOrMap (Symb sym) = pretty sym

printSymbOrMap (Symb_map source dest _) =

pretty source <+> mapsto <+> pretty dest

printSymbMapItems :: SYMB_MAP_ITEMS -> Doc

printSymbMapItems (Symb_map_items xs _) = fsep $ map pretty xs

-- Instances for GetRange

instance GetRange OP_ITEM where

getRange = Range . rangeSpan

rangeSpan x = case x of

Op_item a b -> joinRanges [rangeSpan a, rangeSpan b]

instance GetRange EPComponent where

getRange = Range . rangeSpan

rangeSpan = rangeSpan . epNameOfComp

instance GetRange VAR_ITEM where

getRange = Range . rangeSpan

rangeSpan x = case x of

Var_item a _ b -> joinRanges [rangeSpan a, rangeSpan b]

instance GetRange BASIC_SPEC where

getRange = Range . rangeSpan

rangeSpan x = case x of

Basic_spec a -> joinRanges [rangeSpan a]

instance GetRange BASIC_ITEM where

getRange = Range . rangeSpan

rangeSpan x = case x of

Op_decl a -> joinRanges [rangeSpan a]

Var_decls a -> joinRanges [rangeSpan a]

Axiom_item a -> joinRanges [rangeSpan a]

EP_components a -> joinRanges [rangeSpan a]

instance GetRange CMD where

getRange = Range . rangeSpan

rangeSpan (Ass c def) = joinRanges (map rangeSpan [c, def])

rangeSpan (Cmd _ exps) = joinRanges (map rangeSpan exps)

-- parsing guruantees l <> null

rangeSpan (Repeat c l) = joinRanges [rangeSpan c, rangeSpan $ head l]

-- parsing guruantees l <> null

rangeSpan (Sequence l) = rangeSpan $ head l

rangeSpan (Cond l) = rangeSpan $ head l

instance GetRange SYMB_ITEMS where

getRange = Range . rangeSpan

rangeSpan (Symb_items a b) = joinRanges [rangeSpan a, rangeSpan b]

instance GetRange SYMB where

getRange = Range . rangeSpan

rangeSpan (Symb_id a) = joinRanges [rangeSpan a]

instance GetRange SYMB_MAP_ITEMS where

getRange = Range . rangeSpan

rangeSpan (Symb_map_items a b) = joinRanges [rangeSpan a, rangeSpan b]

instance GetRange SYMB_OR_MAP where

getRange = Range . rangeSpan

rangeSpan x = case x of

Symb a -> joinRanges [rangeSpan a]

Symb_map a b c -> joinRanges [rangeSpan a, rangeSpan b, rangeSpan c]

instance GetRange EXPRESSION where

getRange = Range . rangeSpan

rangeSpan x = case x of

Var token -> joinRanges [rangeSpan token]

Op _ _ exps a -> joinRanges $ [rangeSpan a] ++ (map rangeSpan exps)

List exps a -> joinRanges $ [rangeSpan a] ++ (map rangeSpan exps)

Int _ a -> joinRanges [rangeSpan a]

Rat _ a -> joinRanges [rangeSpan a]

Interval _ _ a -> joinRanges [rangeSpan a]

instance Pretty InstantiatedConstant where

pretty (InstantiatedConstant { constName = cn, instantiation = el }) =

if null el then pretty cn

else pretty cn <> (parens $ sepByCommas $ map pretty el)

-- | If the expression list is a variable list the list of the variable names

-- is returned.

toArgList :: [EXPRESSION] -> [String]

toArgList [] = []

toArgList (Var tok:l) = tokStr tok : toArgList l

toArgList (x:_) = error $ "toArgList: unsupported as argument " ++ show (pretty x)