{- HetCATS/CASL/SortItem.hs

$Id$

Authors: Christian Maeder

Year: 2002

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

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

from 25 March 2001

C.2.1 Basic Specifications with Subsorts

-}

module SortItem where

import AnnoState

import Id

import Keywords

import Lexer

import AS_Basic_CASL

import AS_Annotation

import Parsec

import Token

import Formula

import ItemList

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

-- sortItem

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

commaSortDecl :: Id -> AParser SORT_ITEM

commaSortDecl s = do c <- commaT

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

let l = s : is

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

sortItems :: AParser SIG_ITEMS

sortItems = itemList sortS sortItem Sort_items