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ocamlgraph ConcreteBidirectional and Dot
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Date: -- (:)
From: Pietro Abate <Pietro.Abate@p...>
Subject: Re: [Caml-list] ocamlgraph ConcreteBidirectional and Dot
I still don't have an answer for this problem, but I'm wondering now ...
is there a way to create a Labeled ConcreteBidirectional reusing these
building blocks ? 

is there an ocamlgraph specific ml ?

:)
p


On Fri, Apr 03, 2009 at 02:37:19PM +0200, Pietro Abate wrote:
> Hello all.
> 
> I've a small problem with ocamlgraph.
> I want to parse a dot graph into a ConcreteBidirectional.
> 
> The problem is that the signature needed for Dot.Parse requires a function
> edge, but I've no mean to specify a label (since it is unlabelled !!)... 
> 
> The functor for ConcreteBidirectional says E.t = (V.t * V.t), 
> but I don't quite understand the type of B.G.E.label ... 
> 
> ConcreteBidirectional is of type Sig.I with
> with type V.t = V.t and type V.label = V.t and type E.t = V.t * V.t
> 
> Sig.I includes Sig.G
> 
> and Sig.G has E: Sig.EDGE  with type vertex = vertex
> but I'm missing the type of label for unlabelled graphs ... that should be
> an implementation detail, isn't it ?
> 
> I tried to look at the implementation of per_imp.ml but I got a bit lost...
> 
> this is what I'm trying to do: 
> 
> -------------------
> module V = struct
>     type t = string
>     let compare = Pervasives.compare
>     let hash = Hashtbl.hash
>     let equal l1 l2 = (l1 = l2)
> end
> 
> module G = Imperative.Digraph.ConcreteBidirectional(V)
> 
> module B = Builder.I(G)
> 
> module L = struct
>   open Dot_ast
>   let node (id,_) attrs = match id with
>     | Ident i -> i
>     | Number n -> n
>     | String s -> s
>     | Html h -> h
>   let edge l = ""
> end
> 
> module DIn = Dot.Parse (B)(L)
> 
> ---------------
> 
> the problem is:
> 
> Error: Signature mismatch:
>        Modules do not match:
>          sig
>            val node : Graph.Dot_ast.id * 'a -> 'b -> string
>            val edge : 'a -> string
>          end
>        is not included in
>          sig
>            val node :
>              Graph.Dot_ast.node_id -> Graph.Dot_ast.attr list -> B.G.V.label
>            val edge : Graph.Dot_ast.attr list -> B.G.E.label
>          end
>        Values do not match:
>          val edge : 'a -> string
>        is not included in
>          val edge : Graph.Dot_ast.attr list -> B.G.E.label
> Command exited with code 2.
> 
> 
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