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

src-3.0/GF/Visualization/VisualizeTree.hs

@@ -0,0 +1,58 @@
+----------------------------------------------------------------------
+-- |
+-- Module      : VisualizeTree
+-- Maintainer  : AR
+-- Stability   : (stable)
+-- Portability : (portable)
+--
+-- > CVS $Date: 
+-- > CVS $Author:
+-- > CVS $Revision: 
+--
+-- Print a graph of an abstract syntax tree in Graphviz DOT format
+-- Based on BB's VisualizeGrammar
+-- FIXME: change this to use GF.Visualization.Graphviz, 
+--        instead of rolling its own.
+-----------------------------------------------------------------------------
+
+module GF.Visualization.VisualizeTree ( visualizeTrees
+			) where
+
+import GF.Infra.Ident
+import GF.Infra.Option
+import GF.Grammar.Abstract
+import GF.Data.Zipper
+import GF.Grammar.PrGrammar
+
+import Data.List (intersperse, nub)
+import Data.Maybe (maybeToList)
+
+visualizeTrees :: Options -> [Tree] -> String
+visualizeTrees opts = unlines . map (prGraph opts . tree2graph opts)
+
+tree2graph :: Options -> Tree -> [String]
+tree2graph opts = prf [] where
+  prf ps t@(Tr (node, trees)) = 
+    let (nod,lab) = prn ps node in
+      (nod ++ " [label = " ++ lab ++ ", style = \"solid\", shape = \"plaintext\"] ;") : 
+      [       pra (j:ps) nod t | (j,t) <- zip [0..] trees] ++
+      concat [prf (j:ps) t     | (j,t) <- zip [0..] trees]
+  prn ps (N (bi,at,val,_,_)) = 
+    let 
+      lab = 
+        "\"" ++ 
+        prb bi ++ 
+        prc at val ++ 
+        "\""
+    in if oElem (iOpt "g") opts then (lab,lab) else (show(show (ps :: [Int])),lab)
+  prb [] = ""
+  prb bi = "\\" ++ concat (intersperse "," (map (prt_ . fst) bi)) ++ " -> "
+  pra i nod t@(Tr (node,_)) =  nod ++ arr ++ fst (prn i node) ++ " [style = \"solid\"];"
+  prc a v 
+    | oElem (iOpt "c") opts = prt_ v
+    | oElem (iOpt "f") opts = prt_ a
+    | otherwise             = prt_ a ++ " : " ++ prt_ v
+  arr = if oElem (iOpt "g") opts then " -> " else " -- "
+
+prGraph opts ns = concat $ map (++"\n") $ [graph ++ "{\n"] ++ ns ++ ["}"] where
+  graph = if oElem (iOpt "g") opts then "digraph" else "graph"