Founding the newly structured GF2.0 cvs archive.

src/GF/CF/PPrCF.hs

@@ -0,0 +1,59 @@
+module PPrCF where
+
+import Operations
+import CF
+import CFIdent
+import AbsGFC
+import PrGrammar
+
+-- printing and parsing CF grammars, rules, and trees AR 26/1/2000 -- 9/6/2003
+---- use the Print class instead!
+
+prCF :: CF -> String
+prCF = unlines . (map prCFRule) . rulesOfCF -- hiding the literal recogn function
+
+prCFTree :: CFTree -> String
+prCFTree (CFTree (fun, (_,trees))) = prCFFun fun ++ prs trees where 
+ prs [] = ""
+ prs ts = " " ++ unwords (map ps ts)
+ ps t@(CFTree (_,(_,[]))) = prCFTree t
+ ps t = prParenth (prCFTree t)
+
+prCFRule :: CFRule -> String
+prCFRule (fun,(cat,its)) = 
+  prCFFun fun ++ "." +++ prCFCat cat +++ "::=" +++ 
+  unwords (map prCFItem its) +++ ";"
+
+prCFFun :: CFFun -> String
+prCFFun = prCFFun' True ---- False -- print profiles for debug
+
+prCFFun' :: Bool -> CFFun -> String
+prCFFun' profs (CFFun (t, p)) = prt t ++ pp p where
+    pp p = if (not profs || normal p) then "" else "_" ++ concat (map show p)
+    normal p = and [x==y && null b | ((b,x),y) <- zip p (map (:[]) [0..])]
+
+prCFCat :: CFCat -> String
+prCFCat (CFCat (c,l)) = prt c ++ "-" ++ prt l ----
+
+prCFItem (CFNonterm c) = prCFCat c
+prCFItem (CFTerm a) = prRegExp a
+
+prRegExp (RegAlts tt) = case tt of
+  [t] -> prQuotedString t
+  _ -> prParenth (prTList " | " (map prQuotedString tt))
+
+{- ----
+-- rules have an amazingly easy parser, if we use the format
+-- fun. C -> item1 item2 ... where unquoted items are treated as cats
+-- Actually would be nice to add profiles to this.
+
+getCFRule :: String -> Maybe CFRule
+getCFRule s = getcf (wrds s) where
+  getcf ww | length ww > 2 && ww !! 2 `elem` ["->", "::="] = 
+            Just (string2CFFun (init fun), (string2CFCat cat, map mkIt its)) where
+    fun : cat : _ : its = words s
+    mkIt ('"':w@(_:_)) = atomCFTerm (string2CFTok (init w))
+    mkIt w = CFNonterm (string2CFCat w)
+  getcf _ = Nothing
+  wrds = takeWhile (/= ";") . words -- to permit semicolon in the end
+-}