4632N/ACopyright : (c) Till Mossakowski, Wiebke Herding, C. Maeder, Uni Bremen 2004
4632N/AMaintainer : luettich@tzi.de
4632N/AAbstract syntax for modal logic extension of CASL
4632N/A Only the added syntax is specified
4632N/Atype M_BASIC_SPEC = BASIC_SPEC M_BASIC_ITEM M_SIG_ITEM M_FORMULA
type AnModFORM = Annoted (FORMULA M_FORMULA)
data M_BASIC_ITEM = Simple_mod_decl [Annoted SIMPLE_ID] [AnModFORM] [Pos]
| Term_mod_decl [Annoted SORT] [AnModFORM] [Pos]
data RIGOR = Rigid | Flexible deriving (Eq, Show)
Rigid_op_items RIGOR [Annoted (OP_ITEM M_FORMULA)] [Pos]
| Rigid_pred_items RIGOR [Annoted (PRED_ITEM M_FORMULA)] [Pos]
-- pos: pred, semi colons
data MODALITY = Simple_mod SIMPLE_ID | Term_mod (TERM M_FORMULA)
data M_FORMULA = BoxOrDiamond Bool MODALITY (FORMULA M_FORMULA) [Pos]
-- The identifier and the term specify the kind of the modality
-- pos: "[]" or "<>", True if Box, False if Diamond
modalityS, modalitiesS, flexibleS, rigidS, termS, emptyS, diamondS, greaterS
modalitiesS = init modalityS ++ "ies"
modal_reserved_words :: [String]
modal_reserved_words = diamondS:termS:rigidS:flexibleS:modalityS:[modalitiesS]