From 0ece452577dc3d9e593c862c0531367aa6d8840a Mon Sep 17 00:00:00 2001
From: Stefano Zacchiroli <zack@upsilon.cc>
Date: Wed, 19 Jul 2006 17:29:44 +0000
Subject: [PATCH] - enable header to output graphs attributes and graph-wide
 node and edge   attributes - quote nodes only when needed

---
 components/extlib/graphvizPp.ml  | 25 +++++++++++++++++++++----
 components/extlib/graphvizPp.mli | 10 +++++++++-
 2 files changed, 30 insertions(+), 5 deletions(-)

diff --git a/components/extlib/graphvizPp.ml b/components/extlib/graphvizPp.ml
index aa472f769..4804699e0 100644
--- 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;
diff --git a/components/extlib/graphvizPp.mli b/components/extlib/graphvizPp.mli
index fa635a971..a10831dca 100644
--- a/components/extlib/graphvizPp.mli
+++ b/components/extlib/graphvizPp.mli
@@ -31,7 +31,15 @@ type attribute = string * string  (* <key, value> pair *)
 
 module type GraphvizFormatter =
   sig
-    val header: ?name:string -> Format.formatter -> unit
+    (** @param name graph name
+     * @param graph_attrs graph attributes
+     * @param node_attrs graph-wide node attributes
+     * @param edge_attrs graph-wide edge attributes *)
+    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 ->
-- 
2.39.2