{-|

Module : $Header$

Copyright : (c) Till Mossakowski, Uni Bremen 2002-2004

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

Maintainer : hets@tzi.de

Stability : provisional

Portability : portable

Provide prover stuff for class Logic.Sentences

-}

module Logic.Prover where

-- theories and theory morphisms

data Theory sign sen =

Theory {sign_of :: sign,

ax_of :: [(String,sen)]

}

data TheoryMorphism sign sen mor =

TheoryMorphism {t_source, t_target :: Theory sign sen,

t_morphism :: mor

}

-- proofs and provers

type Rule = String

type Tactic_script = String -- the file name

data Proof_status sen proof_tree = Open sen

| Disproved sen

| Proved(sen,

[sen], -- used axioms

String, -- name of prover

proof_tree,

Tactic_script)

data Prover sen proof_tree symbol =

Prover { prover_name :: String,

prover_sublogic :: String,

add_sym :: symbol -> IO(Bool), -- returns True if succeeded

remove_sym :: symbol -> IO(Bool), -- returns True if succeeded

add_sen :: sen -> IO(Bool), -- returns True if succeeded

remove_sen :: sen -> IO(Bool), -- returns True if succeeded

prove :: sen -> IO([Proof_status sen proof_tree]), -- proof status for goal and lemmas

add_termination_info :: [symbol] -> [(symbol,[symbol])] -> IO(Bool), -- returns True if succeeded

remove_termination_info :: [symbol] -> [(symbol,[symbol])] -> IO(Bool), -- returns True if succeeded

replay :: proof_tree -> Maybe sen -- what about the theory???

}

data Cons_checker morphism =

Cons_checker {cons_checker_name :: String,

cons_checker_sublogic :: String,

cons_check :: morphism -> IO(Bool, Tactic_script)

}