{- HetCATS/CASL/Parse_AS_Basic.hs

$Id$

Authors: Christian Maeder

Year: 2002

parse SIG-ITEMS, BASIC-ITEMS, BASIC-SPEC

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

from 25 March 2001

C.2.1 Basic Specifications with Subsorts

-}

module CASL.Parse_AS_Basic where

import Common.AnnoState

import Common.Id

import Common.Keywords

import Common.Lexer

import CASL.AS_Basic_CASL

import Common.AS_Annotation

import Data.Maybe

import Common.Lib.Parsec

import CASL.Formula

import CASL.SortItem

import CASL.OpItem

import CASL.TypeItem

import CASL.ItemList

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

-- sigItems

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

sigItems :: AParser SIG_ITEMS

sigItems = sortItems <|> opItems <|> predItems <|> typeItems

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

-- basicItems

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

basicItems :: AParser BASIC_ITEMS

basicItems = fmap Sig_items sigItems

<|> do f <- asKey freeS

Datatype_items ts ps <- typeItems

return (Free_datatype ts (tokPos f : ps))

<|> do g <- asKey generatedS

do t <- typeItems

return (Sort_gen [Annoted t [] [] []] [tokPos g])

<|>

do o <- oBraceT

is <- annosParser sigItems

c <- cBraceT

return (Sort_gen is

(toPos g [o] c))

<|> do v <- pluralKeyword varS

(vs, ps) <- varItems

return (Var_items vs (map tokPos (v:ps)))

<|> do f <- forallT

(vs, ps) <- varDecl `separatedBy` anSemi

a <- annos

Axiom_items ((Annoted ft qs as rs):fs) ds <- dotFormulae

let aft = Annoted ft qs (a++as) rs

in return (Local_var_axioms vs (aft:fs)

(map tokPos (f:ps) ++ ds))

<|> dotFormulae

<|> do a <- pluralKeyword axiomS

(fs, ps, ans) <- itemAux startKeyword formula

return (Axiom_items (zipWith

(\ x y -> Annoted x [] [] y)

fs ans) (map tokPos (a:ps)))

varItems :: AParser ([VAR_DECL], [Token])

varItems = do v <- varDecl

do s <- try (addAnnos >> Common.Lexer.semiT << addLineAnnos)

do tryItemEnd startKeyword

return ([v], [s])

<|>

do (vs, ts) <- varItems

return (v:vs, s:ts)

<|>

return ([v], [])

dotFormulae :: AParser BASIC_ITEMS

dotFormulae = do d <- dotT

(fs, ds) <- aFormula `separatedBy` dotT

(m, an) <- optSemi

let ps = map tokPos (d:ds)

ns = init fs ++ [appendAnno (last fs) an]

in case m of

Nothing -> return (Axiom_items ns ps)

Just t -> return (Axiom_items ns

(ps ++ [tokPos t]))

aFormula :: AParser (Annoted FORMULA)

aFormula = bind appendAnno (annoParser formula) lineAnnos

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

-- basicSpec

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

basicSpec :: AParser BASIC_SPEC

basicSpec = (fmap Basic_spec $ many1 $

try $ annoParser basicItems)

<|> try (oBraceT >> cBraceT >> return (Basic_spec []))