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solved: path problem in SimpleGFC

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This commit is contained in:
peb
2005-11-24 10:02:53 +00:00
parent 506dd0809c
commit 9d408658de
1 changed files with 7 additions and 6 deletions
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13
src/GF/Formalism/SimpleGFC.hs
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@@ -166,6 +166,7 @@ enumeratePatterns t = enumerateTerms Nothing t
----------------------------------------------------------------------
-- * paths of record projections and table selections
-- | Note that the list of labels/selection terms is /reversed/
newtype Path c t = Path [Either Label (Term c t)] deriving (Eq, Ord, Show)
emptyPath :: Path c t
@@ -180,20 +181,20 @@ Path path ++. lbl = Path (Left lbl : path)
Path path ++! sel = Path (Right sel : path)
lintypeFollowPath :: (Print c,Print t) => Path c t -> LinType c t -> LinType c t
lintypeFollowPath (Path path0) ctype0 = follow path0 ctype0
lintypeFollowPath (Path path0) ctype0 = follow (reverse path0) ctype0
where follow [] ctype = ctype
follow (Right pat : path) (TblT _ ctype) = follow path ctype
follow (Left lbl : path) (RecT rec)
= maybe err (follow path) $ lookup lbl rec
where err = error $ "lintypeFollowPath: label not in record type"
++ "\nLabel: " ++ prt lbl
++ "\nPath: " ++ prt (Path path0)
++ "\nCType: " ++ prt ctype0
++ "\nRType: " ++ prt (RecT rec)
++ "\nOriginal Path: " ++ prt (Path path0)
++ "\nOriginal CType: " ++ prt ctype0
++ "\nCurrent Label: " ++ prt lbl
++ "\nCurrent RType: " ++ prt (RecT rec)
--- by AR for debugging 23/11/2005
termFollowPath :: (Eq c, Eq t) => Path c t -> Term c t -> Term c t
termFollowPath (Path path) = follow (reverse path)
termFollowPath (Path path0) = follow (reverse path0)
where follow [] term = term
follow (Right pat : path) term = follow path (term +! pat)
follow (Left lbl : path) term = follow path (term +. lbl)