{- |

Module : $Header$

Copyright : (c) Christian Maeder, Uni Bremen 2002-2004

Licence : similar to LGPL, see HetCATS/LICENCE.txt or LIZENZ.txt

Maintainer : hets@tzi.de

Stability : provisional

Portability : portable

-}

{-

parse SORT-ITEM and "sort/sorts SORT-ITEM ; ... ; SORT-ITEM"

parse DATATYPE-DECL

http://www.cofi.info/Documents/CASL/Summary/

from 25 March 2001

C.2.1 Basic Specifications with Subsorts

-}

module CASL.SortItem (sortItem, datatype) where

import Common.AnnoState

import Common.Id

import Common.Keywords

import Common.Lexer

import CASL.AS_Basic_CASL

import Common.AS_Annotation

import Common.Lib.Parsec

import Common.Token

import CASL.Formula

-- ------------------------------------------------------------------------

-- sortItem

-- ------------------------------------------------------------------------

commaSortDecl :: Id -> AParser SORT_ITEM

commaSortDecl s = do c <- anComma

(is, cs) <- sortId `separatedBy` anComma

let l = s : is

p = map tokPos (c:cs) in

subSortDecl (l, p) <|> return (Sort_decl l p)

isoDecl :: Id -> AParser SORT_ITEM

isoDecl s = do e <- equalT

subSortDefn (s, tokPos e)

<|>

(do (l, p) <- sortId `separatedBy` equalT

return (Iso_decl (s:l) (map tokPos (e:p))))

subSortDefn :: (Id, Pos) -> AParser SORT_ITEM

subSortDefn (s, e) = do a <- annos

o <- oBraceT

v <- varId

c <- colonT

t <- sortId

d <- dotT -- or bar

f <- formula

p <- cBraceT

return $ Subsort_defn s v t (Annoted f [] a [])

(e: map tokPos [o, c, d, p])

subSortDecl :: ([Id], [Pos]) -> AParser SORT_ITEM

subSortDecl (l, p) = do t <- lessT

s <- sortId

return (Subsort_decl l s (p++[tokPos t]))

sortItem :: AParser SORT_ITEM

sortItem = do s <- sortId ;

subSortDecl ([s],[])

<|>

commaSortDecl s

<|>

isoDecl s

<|>

return (Sort_decl [s] [])

-- ------------------------------------------------------------------------

-- typeItem

-- ------------------------------------------------------------------------

datatype :: AParser DATATYPE_DECL

datatype = do s <- sortId

addAnnos

e <- asKey defnS

addAnnos

a <- getAnnos

(Annoted v _ _ b:as, ps) <- aAlternative

`separatedBy` barT

return (Datatype_decl s (Annoted v [] a b:as)

(map tokPos (e:ps)))

aAlternative :: AParser (Annoted ALTERNATIVE)

aAlternative = do a <- alternative

an <- annos

return (Annoted a [] [] an)

alternative :: AParser ALTERNATIVE

alternative = do s <- pluralKeyword sortS

(ts, cs) <- sortId `separatedBy` anComma

return (Subsorts ts (map tokPos (s:cs)))

<|>

do i <- consId

do o <- oParenT

(cs, ps) <- component `separatedBy` anSemi

c <- cParenT

let qs = toPos o ps c in

do q <- quMarkT

return (Partial_construct i cs

(qs++[tokPos q]))

<|> return (Total_construct i cs qs)

<|> return (Total_construct i [] [])

isSortId :: Id -> Bool

isSortId (Id is _ _) = case is of

[Token (c:_) _] -> c `elem` caslLetters

_ -> False

component :: AParser COMPONENTS

component = do (is, cs) <- parseId `separatedBy` anComma

if isSingle is && isSortId (head is) then

compSort is cs

<|> return (Sort (head is))

else compSort is cs

compSort :: [OP_NAME] -> [Token] -> AParser COMPONENTS

compSort is cs = do c <- colonST

(b, t, _) <- opSort

let p = map tokPos (cs++[c]) in

return (if b then Partial_select is t p

else Total_select is t p)