- enable header to output graphs attributes and graph-wide node and edge

[helm.git] / components / extlib / graphvizPp.ml

diff --git a/components/extlib/graphvizPp.ml b/components/extlib/graphvizPp.ml
index aa472f76982945843304c7e1a3e589d17f4350ed..4804699e0a7ef048dae9851641411e7e768be6e5 100644 (file)
--- a/components/extlib/graphvizPp.ml
+++ b/components/extlib/graphvizPp.ml
@@ -29,7 +29,11 @@ type attribute = string * string  (* <key, value> pair *)
 
 module type GraphvizFormatter =
   sig
-    val header: ?name:string -> Format.formatter -> unit
+    val header:
+      ?name:string -> ?graph_attrs:(attribute list) ->
+      ?node_attrs:(attribute list) -> ?edge_attrs:(attribute list) ->
+      Format.formatter ->
+        unit
     val node: string -> ?attrs:(attribute list) -> Format.formatter -> unit
     val edge:
       string -> string -> ?attrs:(attribute list) -> Format.formatter ->
@@ -45,11 +49,24 @@ module Dot =
     let attribute fmt (k, v) = fprintf fmt "@[<hv2>%s=@,\"%s\",@]" k v
     let attributes attrs fmt = List.iter (attribute fmt) attrs
 
-    let header ?(name = "g") fmt = fprintf fmt "@[<hv2>digraph %s {@," name
-    let node name ?(attrs = []) fmt =
-      fprintf fmt "@[<hov2>\"%s\"@ [" name;
+    let node name ~quote ?(attrs = []) fmt =
+      let quote_string = if quote then "\"" else "" in
+      fprintf fmt "@[<hov2>%s%s%s@ [" quote_string name quote_string;
       attributes attrs fmt;
       fprintf fmt "];@]@,"
+
+    let header ?(name = "g") ?(graph_attrs = []) ?node_attrs ?edge_attrs fmt =
+      fprintf fmt "@[<hv2>strict digraph %s {@," name;
+      List.iter (fun (k, v) -> fprintf fmt "@[<hv2>%s=@,%s;@]@," k v)
+        graph_attrs;
+      (match node_attrs with
+      | Some attrs -> node "node" ~quote:false ~attrs fmt
+      | None -> ());
+      (match edge_attrs with
+      | Some attrs -> node "edge" ~quote:false ~attrs fmt
+      | None -> ())
+
+    let node = node ~quote:true
     let edge name1 name2 ?(attrs = []) fmt =
       fprintf fmt "@[<hov2>\"%s\" ->@ \"%s\"@ [" name1 name2;
       attributes attrs fmt;