Tactic.cs

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/*++
Copyright (c) 2012 Microsoft Corporation

Module Name:

    Tactic.cs

Abstract:

    Z3 Managed API: Tactics

Author:

    Christoph Wintersteiger (cwinter) 2012-03-21

Notes:
    
--*/

using System;
using System.Diagnostics.Contracts;

namespace Microsoft.Z3
{
    [ContractVerification(true)]
    public class Tactic : Z3Object
    {
        public string Help
        {
            get
            {
                Contract.Ensures(Contract.Result<string>() != null);

                return Native.Z3_tactic_get_help(Context.nCtx, NativeObject);
            }
        }


        public ParamDescrs ParameterDescriptions
        {
            get { return new ParamDescrs(Context, Native.Z3_tactic_get_param_descrs(Context.nCtx, NativeObject)); }
        }


        public ApplyResult Apply(Goal g, Params p = null)
        {
            Contract.Requires(g != null);
            Contract.Ensures(Contract.Result<ApplyResult>() != null);

            Context.CheckContextMatch(g);
            if (p == null)
                return new ApplyResult(Context, Native.Z3_tactic_apply(Context.nCtx, NativeObject, g.NativeObject));
            else
            {
                Context.CheckContextMatch(p);
                return new ApplyResult(Context, Native.Z3_tactic_apply_ex(Context.nCtx, NativeObject, g.NativeObject, p.NativeObject));
            }
        }

        public ApplyResult this[Goal g]
        {
            get
            {
                Contract.Requires(g != null);
                Contract.Ensures(Contract.Result<ApplyResult>() != null);

                return Apply(g);
            }
        }

        public Solver Solver
        {
            get
            {
                Contract.Ensures(Contract.Result<Solver>() != null);

                return Context.MkSolver(this);
            }
        }

        #region Internal
        internal Tactic(Context ctx, IntPtr obj)
            : base(ctx, obj)
        {
            Contract.Requires(ctx != null);
        }
        internal Tactic(Context ctx, string name)
            : base(ctx, Native.Z3_mk_tactic(ctx.nCtx, name))
        {
            Contract.Requires(ctx != null);
        }

        internal class DecRefQueue : IDecRefQueue
        {
            public DecRefQueue() : base() { }
            public DecRefQueue(uint move_limit) : base(move_limit) { }
            internal override void IncRef(Context ctx, IntPtr obj)
            {
                Native.Z3_tactic_inc_ref(ctx.nCtx, obj);
            }

            internal override void DecRef(Context ctx, IntPtr obj)
            {
                Native.Z3_tactic_dec_ref(ctx.nCtx, obj);
            }
        };

        internal override void IncRef(IntPtr o)
        {
            Context.Tactic_DRQ.IncAndClear(Context, o);
            base.IncRef(o);
        }

        internal override void DecRef(IntPtr o)
        {
            Context.Tactic_DRQ.Add(o);
            base.DecRef(o);
        }
        #endregion
    }
}