X-Git-Url: http://matita.cs.unibo.it/gitweb/?a=blobdiff_plain;f=helm%2Fgraphs%2Ftools%2Fsimplify_deps%2Fsimplify_deps.ml;h=9b0fb0042ab5d5847807fcd6fae877789c090c1e;hb=4167cea65ca58897d1a3dbb81ff95de5074700cc;hp=0763d614974b35679a6993e06b23622c99a1c36c;hpb=53ae76208da0cf33862c64e60b76a441e1d78863;p=helm.git

diff --git a/helm/graphs/tools/simplify_deps/simplify_deps.ml b/helm/graphs/tools/simplify_deps/simplify_deps.ml
index 0763d6149..9b0fb0042 100644
--- a/helm/graphs/tools/simplify_deps/simplify_deps.ml
+++ b/helm/graphs/tools/simplify_deps/simplify_deps.ml
@@ -55,32 +55,36 @@ let parse () =
  try
   while true do
    let line = read_line () in
-    if Str.string_match (Str.regexp " \([^ ]*\) -> \([^ ;]*\)\(\( \[.*\]\)?\);") line 0 then
+    if Str.string_match (Str.regexp " \\([^ ]*\\) -> \\([^ ;]*\\)\\(\\( \\[.*\\]\\)?\\);") line 0 then
      let source = Str.matched_group 1 line in
      let target = Str.matched_group 2 line in
-     let rest   = Str.matched_group 3 line in
-      let tar =
-        try
-	 search_node target
-        with
-         Not_found ->
-	  let tar = Node (target,ref []) in
-	   nodes := tar :: !nodes ;
-	   tar
-      in
-       let sou =
-        try
-         let sou = search_node source in
-          let Node (_,ts) = sou in
-           ts := tar::!ts ;
-	   sou
-        with
-         Not_found ->
-          let sou = Node (source,ref [tar]) in
-           nodes := sou :: !nodes ;
-	   sou
-       in
-        arcs := (sou,tar,rest)::!arcs
+      begin
+       if source <> target then
+        (* not a self loop *)
+        let rest   = Str.matched_group 3 line in
+         let tar =
+           try
+	          search_node target
+           with
+            Not_found ->
+	           let tar = Node (target,ref []) in
+	            nodes := tar :: !nodes ;
+	            tar
+         in
+          let sou =
+           try
+            let sou = search_node source in
+             let Node (_,ts) = sou in
+              ts := tar::!ts ;
+	            sou
+           with
+            Not_found ->
+             let sou = Node (source,ref [tar]) in
+              nodes := sou :: !nodes ;
+	            sou
+          in
+           arcs := (sou,tar,rest)::!arcs
+      end
     else
      print_endline line
   done