GF/src is now for 2.9, and the new sources are in src-3.0 - keep it this way until the release of GF 3

1 files changed, 157 insertions, 0 deletions

diff --git a/src-3.0/GF/CFGM/PrintCFG.hs b/src-3.0/GF/CFGM/PrintCFG.hs
new file mode 100644
index 000000000..0fd46239c
--- /dev/null
+++ b/src-3.0/GF/CFGM/PrintCFG.hs
@@ -0,0 +1,157 @@
+module GF.CFGM.PrintCFG where
+
+-- pretty-printer generated by the BNF converter
+
+import GF.CFGM.AbsCFG
+import Char
+
+-- the top-level printing method
+printTree :: Print a => a -> String
+printTree = render . prt 0
+
+type Doc = [ShowS] -> [ShowS]
+
+doc :: ShowS -> Doc
+doc = (:)
+
+render :: Doc -> String
+render d = rend 0 (map ($ "") $ d []) "" where
+  rend i ss = case ss of
+    "["      :ts -> showChar '[' . rend i ts
+    "("      :ts -> showChar '(' . rend i ts
+    "{"      :ts -> showChar '{' . new (i+1) . rend (i+1) ts
+    "}" : ";":ts -> new (i-1) . space "}" . showChar ';' . new (i-1) . rend (i-1) ts
+    "}"      :ts -> new (i-1) . showChar '}' . new (i-1) . rend (i-1) ts
+    ";"      :ts -> showChar ';' . new i . rend i ts
+    t  : "," :ts -> showString t . space "," . rend i ts
+    t  : ")" :ts -> showString t . showChar ')' . rend i ts
+    t  : "]" :ts -> showString t . showChar ']' . rend i ts
+    t        :ts -> space t . rend i ts
+    _            -> id
+  new i   = showChar '\n' . replicateS (2*i) (showChar ' ') . dropWhile isSpace
+  space t = showString t . (\s -> if null s then "" else (' ':s))
+
+parenth :: Doc -> Doc
+parenth ss = doc (showChar '(') . ss . doc (showChar ')')
+
+concatS :: [ShowS] -> ShowS
+concatS = foldr (.) id
+
+concatD :: [Doc] -> Doc
+concatD = foldr (.) id
+
+replicateS :: Int -> ShowS -> ShowS
+replicateS n f = concatS (replicate n f)
+
+-- the printer class does the job
+class Print a where
+  prt :: Int -> a -> Doc
+  prtList :: [a] -> Doc
+  prtList = concatD . map (prt 0)
+
+instance Print a => Print [a] where
+  prt _ = prtList
+
+instance Print Char where
+  prt _ s = doc (showChar '\'' . mkEsc '\'' s . showChar '\'')
+  prtList s = doc (showChar '"' . concatS (map (mkEsc '"') s) . showChar '"')
+
+mkEsc :: Char -> Char -> ShowS
+mkEsc q s = case s of
+  _ | s == q -> showChar '\\' . showChar s
+  '\\'-> showString "\\\\"
+  '\n' -> showString "\\n"
+  '\t' -> showString "\\t"
+  _ -> showChar s
+
+prPrec :: Int -> Int -> Doc -> Doc
+prPrec i j = if j<i then parenth else id
+
+
+instance Print Integer where
+  prt _ x = doc (shows x)
+  prtList es = case es of
+   [] -> (concatD [])
+   [x] -> (concatD [prt 0 x])
+   x:xs -> (concatD [prt 0 x , doc (showString ",") , prt 0 xs])
+
+
+instance Print Double where
+  prt _ x = doc (shows x)
+
+
+instance Print Ident where
+  prt _ (Ident i) = doc (showString i)
+
+
+instance Print SingleQuoteString where
+  prt _ (SingleQuoteString i) = doc (showString i)
+
+
+
+instance Print Grammars where
+  prt i e = case e of
+   Grammars grammars -> prPrec i 0 (concatD [prt 0 grammars])
+
+
+instance Print Grammar where
+  prt i e = case e of
+   Grammar id flags rules -> prPrec i 0 (concatD [doc (showString "grammar") , prt 0 id , prt 0 flags , prt 0 rules , doc (showString "end") , doc (showString "grammar")])
+
+  prtList es = case es of
+   [] -> (concatD [])
+   x:xs -> (concatD [prt 0 x , prt 0 xs])
+
+instance Print Flag where
+  prt i e = case e of
+   StartCat category -> prPrec i 0 (concatD [doc (showString "startcat") , prt 0 category])
+
+  prtList es = case es of
+   [] -> (concatD [])
+   x:xs -> (concatD [prt 0 x , doc (showString ";") , prt 0 xs])
+
+instance Print Rule where
+  prt i e = case e of
+   Rule fun profiles category symbols -> prPrec i 0 (concatD [prt 0 fun , doc (showString ":") , prt 0 profiles , doc (showString ".") , prt 0 category , doc (showString "->") , prt 0 symbols])
+
+  prtList es = case es of
+   [] -> (concatD [])
+   x:xs -> (concatD [prt 0 x , doc (showString ";") , prt 0 xs])
+
+instance Print Fun where
+  prt i e = case e of
+   Cons id -> prPrec i 0 (concatD [prt 0 id])
+   Coerce  -> prPrec i 0 (concatD [doc (showString "_")])
+
+
+instance Print Profiles where
+  prt i e = case e of
+   Profiles profiles -> prPrec i 0 (concatD [doc (showString "[") , prt 0 profiles , doc (showString "]")])
+
+
+instance Print Profile where
+  prt i e = case e of
+   UnifyProfile ns -> prPrec i 0 (concatD [doc (showString "[") , prt 0 ns , doc (showString "]")])
+   ConstProfile id -> prPrec i 0 (concatD [prt 0 id])
+
+  prtList es = case es of
+   [] -> (concatD [])
+   [x] -> (concatD [prt 0 x])
+   x:xs -> (concatD [prt 0 x , doc (showString ",") , prt 0 xs])
+
+instance Print Symbol where
+  prt i e = case e of
+   CatS category -> prPrec i 0 (concatD [prt 0 category])
+   TermS str -> prPrec i 0 (concatD [prt 0 str])
+
+  prtList es = case es of
+   [] -> (concatD [doc (showString ".")])
+   [x] -> (concatD [prt 0 x])
+   x:xs -> (concatD [prt 0 x , prt 0 xs])
+
+instance Print Category where
+  prt i e = case e of
+   Category singlequotestring -> prPrec i 0 (concatD [prt 0 singlequotestring])
+
+
+