{- |

Module : $Header$

Description : datastructures for annotations of (Het)CASL.

Copyright : (c) Klaus L�ttich, Christian Maeder, and Uni Bremen 2002-2006

License : similar to LGPL, see HetCATS/LICENSE.txt or LIZENZ.txt

Maintainer : Christian.Maeder@dfki.de

Stability : provisional

Portability : portable

Datastructures for annotations of (Het)CASL.

There is also a paramterized data type for an 'Annoted' 'item'.

See also chapter II.5 of the CASL Reference Manual.

-}

module Common.AS_Annotation where

import Common.Id

-- DrIFT command

{-! global: UpPos !-}

-- | start of an annote with its WORD or a comment

data Annote_word = Annote_word String | Comment_start deriving (Show, Eq, Ord)

-- | line or group for 'Unparsed_anno'

data Annote_text = Line_anno String | Group_anno [String]

deriving (Show, Eq, Ord)

-- | formats to be displayed (may be extended in the future).

-- Drop 3 from the show result to get the string for parsing and printing

data Display_format = DF_HTML | DF_LATEX | DF_RTF deriving (Show, Eq, Ord)

-- | swap the entries of a lookup table

swapTable :: [(a, b)] -> [(b, a)]

swapTable = map $ \ (a, b) -> (b, a)

-- | drop the first 3 characters from the show result

toTable :: (Show a) => [a] -> [(a, String)]

toTable = map $ \a -> (a, drop 3 $ show a)

-- | a lookup table for the textual representation of display formats

display_format_table :: [(Display_format, String)]

display_format_table = toTable [ DF_HTML, DF_LATEX, DF_RTF ]

-- | lookup the textual representation of a display format

-- in 'display_format_table'

lookupDisplayFormat :: Display_format -> String

lookupDisplayFormat df =

maybe (error "lookupDisplayFormat: unknown display format")

id $ lookup df display_format_table

-- | precedence 'Lower' means less and 'BothDirections' means less and greater.

-- 'Higher' means greater but this is syntactically not allowed in 'Prec_anno'.

-- 'NoDirection' can also not be specified explicitly,

-- but covers those ids that are not mentionend in precedences.

data PrecRel = Higher | Lower | BothDirections | NoDirection

deriving (Show, Eq, Ord)

-- | either left or right associative

data AssocEither = ALeft | ARight deriving (Show, Eq, Ord)

-- | semantic (line) annotations without further information.

-- Use the same drop-3-trick as for the 'Display_format'.

data Semantic_anno = SA_cons | SA_def | SA_implies | SA_mono | SA_implied

deriving (Show, Eq, Ord)

-- | a lookup table for the textual representation of semantic annos

semantic_anno_table :: [(Semantic_anno, String)]

semantic_anno_table =

toTable [SA_cons, SA_def, SA_implies, SA_mono, SA_implied]

-- | lookup the textual representation of a semantic anno

-- in 'semantic_anno_table'

lookupSemanticAnno :: Semantic_anno -> String

lookupSemanticAnno sa =

maybe (error "lookupSemanticAnno: no semantic anno")

id $ lookup sa semantic_anno_table

-- | all possible annotations (without comment-outs)

data Annotation = -- | constructor for comments or unparsed annotes

Unparsed_anno Annote_word Annote_text Range

-- | known annotes

| Display_anno Id [(Display_format, String)] Range

-- position of anno start, keywords and anno end

| List_anno Id Id Id Range

-- position of anno start, commas and anno end

| Number_anno Id Range

-- position of anno start, commas and anno end

| Float_anno Id Id Range

-- position of anno start, commas and anno end

| String_anno Id Id Range

-- position of anno start, commas and anno end

| Prec_anno PrecRel [Id] [Id] Range

-- ^ positions: "{",commas,"}", RecRel, "{",commas,"}"

-- | Lower = "< " BothDirections = "<>"

| Assoc_anno AssocEither [Id] Range -- position of commas

| Label [String] Range

-- position of anno start and anno end

-- All annotations below are only as annote line allowed

| Semantic_anno Semantic_anno Range

-- position information for annotations is provided

-- by every annotation

deriving (Show, Eq, Ord)

-- |

-- 'isLabel' tests if the given 'Annotation' is a label

-- (a 'Label' typically follows a formula)

isLabel :: Annotation -> Bool

isLabel a = case a of

Label _ _ -> True

_ -> False

isImplies :: Annotation -> Bool

isImplies a = case a of

Semantic_anno SA_implies _ -> True

_ -> False

isImplied :: Annotation -> Bool

isImplied a = case a of

Semantic_anno SA_implied _ -> True

_ -> False

-- |

-- 'isSemanticAnno' tests if the given 'Annotation' is a semantic one

isSemanticAnno :: Annotation -> Bool

isSemanticAnno a = case a of

Semantic_anno _ _ -> True

_ -> False

-- |

-- 'isComment' tests if the given 'Annotation' is a comment line or a

-- comment group

isComment :: Annotation -> Bool

isComment c = case c of

Unparsed_anno Comment_start _ _ -> True

_ -> False

-- |

-- 'isAnnote' is the negation of 'isComment'

isAnnote :: Annotation -> Bool

isAnnote = not . isComment

-- | an item wrapped in preceeding (left 'l_annos')

-- and following (right 'r_annos') annotations.

-- 'opt_pos' should carry the position of an optional semicolon

-- following a formula (but is currently unused).

data Annoted a = Annoted

{ item :: a

, opt_pos :: Range

, l_annos :: [Annotation]

, r_annos :: [Annotation] } deriving (Show, Ord, Eq)

notImplied :: Annoted a -> Bool

notImplied a = not $ any isImplied $ r_annos a

-- | naming or labelling sentences

data SenAttr s a = SenAttr

{ senAttr :: a

, isAxiom :: Bool

, isDef :: Bool

, wasTheorem :: Bool

{- will be set to True when status of isAxiom changes from False to True -}

, simpAnno :: Maybe Bool -- for %simp or %nosimp annotations

, sentence :: s } deriving (Eq, Ord, Show)

-- | equip a sentence with an empty name

makeNamed :: a -> s -> SenAttr s a

makeNamed a s = SenAttr

{ senAttr = a

, isAxiom = True

, isDef = False

, wasTheorem = False

, simpAnno = Nothing

, sentence = s }

type Named s = SenAttr s String

reName :: (String -> String) -> Named s -> Named s

reName f x = x { senAttr = f $ senAttr x }

-- | extending sentence maps to maps on labelled sentences

mapNamed :: (s -> t) -> SenAttr s a -> SenAttr t a

mapNamed f x = x { sentence = f $ sentence x }

-- | extending sentence maybe-maps to maps on labelled sentences

mapNamedM :: Monad m => (s -> m t) -> Named s -> m (Named t)

mapNamedM f x = do

y <- f $ sentence x

return x {sentence = y}

-- | process all items and wrap matching annotations around the results

mapAnM :: (Monad m) => (a -> m b) -> [Annoted a] -> m [Annoted b]

mapAnM f al =

do il <- mapM (f . item) al

return $ zipWith (flip replaceAnnoted) al il

-- | replace the 'item'

replaceAnnoted :: b -> Annoted a -> Annoted b

replaceAnnoted x (Annoted _ o l r) = Annoted x o l r

-- | add further following annotations

appendAnno :: Annoted a -> [Annotation] -> Annoted a

appendAnno (Annoted x p l r) y = Annoted x p l $ r ++ y

-- | put together preceding annotations and an item

addLeftAnno :: [Annotation] -> a -> Annoted a

addLeftAnno l i = Annoted i nullRange l []

-- | decorate with no annotations

emptyAnno :: a -> Annoted a

emptyAnno = addLeftAnno []

-- | get the label following (or to the right of) an 'item'

getRLabel :: Annoted a -> String

getRLabel a =

case filter isLabel (r_annos a) of

Label l _ : _ -> unwords $ concatMap words l

_ -> ""

-- | check for an annotation starting with % and the input str

-- (does not work for known annotation words)

identAnno :: String -> Annotation -> Bool

identAnno str an = case an of

Unparsed_anno (Annote_word wrd) _ _ -> wrd == str

_ -> False

-- | test all anntotions for an item

hasIdentAnno :: String -> Annoted a -> Bool

hasIdentAnno str a = any (identAnno str) $ l_annos a ++ r_annos a

makeNamedSen :: Annoted a -> Named a

makeNamedSen a = (makeNamed (getRLabel a) $ item a)

{ isAxiom = notImplied a

, simpAnno = case (hasIdentAnno "simp" a, hasIdentAnno "nosimp" a) of

(True, False) -> Just True

(False, True) -> Just False

_ -> Nothing }