(*
    ||M||  This file is part of HELM, an Hypertextual, Electronic        
    ||A||  Library of Mathematics, developed at the Computer Science     
    ||T||  Department, University of Bologna, Italy.                     
    ||I||                                                                
    ||T||  HELM is free software; you can redistribute it and/or         
    ||A||  modify it under the terms of the GNU General Public License   
    \   /  version 2 or (at your option) any later version.              
     \ /   This software is distributed as is, NO WARRANTY.              
      V_______________________________________________________________ *)

module P = Printf
module L = Log

let icm = ref 0

type reductions = {
   beta   : int;
   zeta   : int;
   upsilon: int;
   tau    : int;
   ldelta : int;
   gdelta : int;
   si     : int;
   lrt    : int;
   grt    : int
}

let initial_reductions = {
   beta = 0; upsilon = 0; tau = 0; zeta = 0; ldelta = 0; gdelta = 0;
   si = 0; lrt = 0; grt = 0
}

let reductions = ref initial_reductions

let clear_reductions () = reductions := initial_reductions

let add 
   ?(beta=0) ?(upsilon=0) ?(tau=0) ?(ldelta=0) ?(gdelta=0) ?(zeta=0) 
   ?(si=0) ?(lrt=0) ?(grt=0) ()
= reductions := {
   beta = !reductions.beta + beta;
   zeta = !reductions.zeta + zeta;
   upsilon = !reductions.upsilon + upsilon;
   tau = !reductions.tau + tau;
   ldelta = !reductions.ldelta + ldelta;
   gdelta = !reductions.gdelta + gdelta;
   si = !reductions.si + si;
   lrt = !reductions.lrt + lrt;
   grt = !reductions.grt + grt
}

let print_reductions () =
   let r = !reductions in
   let rs = r.beta + r.ldelta + r.zeta + r.upsilon + r.tau + r.gdelta in
   let prs = r.si + r.lrt + r.grt in
   let delta = r.ldelta + r.gdelta in
   let rt = r.lrt + r.grt in   
   L.warn (P.sprintf "  Reductions summary");
   L.warn (P.sprintf "    Proper reductions:        %7u" rs);
   L.warn (P.sprintf "      Beta:                   %7u" r.beta);
   L.warn (P.sprintf "      Delta:                  %7u" delta);
   L.warn (P.sprintf "        Local:                %7u" r.ldelta);
   L.warn (P.sprintf "        Global:               %7u" r.gdelta);
   L.warn (P.sprintf "      Zeta:                   %7u" r.zeta);
   L.warn (P.sprintf "      Upsilon:                %7u" r.upsilon);
   L.warn (P.sprintf "      Tau:                    %7u" r.tau);
   L.warn (P.sprintf "    Pseudo reductions:        %7u" prs);
   L.warn (P.sprintf "      Reference typing:       %7u" rt);
   L.warn (P.sprintf "        Local:                %7u" r.lrt);
   L.warn (P.sprintf "        Global:               %7u" r.grt);
   L.warn (P.sprintf "      Sort inclusion:         %7u" r.si);
   L.warn (P.sprintf "  Relocated nodes (icm):      %7u" !icm)

let indexes = ref false