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//-----------------------------------------------------------------------------
//
// Copyright (C) 2012 Microsoft Corporation. All Rights Reserved.
//
//-----------------------------------------------------------------------------
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using Term = Microsoft.Boogie.VCExprAST.VCExpr;
using FuncDecl = Microsoft.Boogie.VCExprAST.VCExprOp;
using Sort = Microsoft.Boogie.Type;
using Microsoft.Boogie.VCExprAST;
/** This namespace contains some extensions to allow VCExpr to provide the
* interface needed by RPFP and FixedpointVC. */
namespace Microsoft.Boogie.ExprExtensions
{
public enum TermKind { App, Other };
public enum DeclKind { Uninterpreted, And, Implies, Label, Other };
public static class MyExtensions
{
public static Term[] GetAppArgs(this Term t)
{
Microsoft.Boogie.VCExprAST.VCExprNAry tn = t as Microsoft.Boogie.VCExprAST.VCExprNAry;
return tn.ToArray();
}
public static FuncDecl GetAppDecl(this Term t)
{
Microsoft.Boogie.VCExprAST.VCExprNAry tn = t as Microsoft.Boogie.VCExprAST.VCExprNAry;
return tn.Op;
}
public static string GetDeclName(this FuncDecl f)
{
return (f as VCExprBoogieFunctionOp).Func.Name; //TODO
}
public static DeclKind GetKind(this FuncDecl f)
{
if (f is VCExprBoogieFunctionOp)
return DeclKind.Uninterpreted;
if (f == VCExpressionGenerator.AndOp)
return DeclKind.And;
if (f == VCExpressionGenerator.ImpliesOp)
return DeclKind.Implies;
if (f is VCExprLabelOp)
return DeclKind.Label;
return DeclKind.Other;
}
public static bool IsLabel(this Term t)
{
return (t is VCExprNAry) && (GetAppDecl(t) is VCExprLabelOp);
}
public static string LabelName(this Term t)
{
return (GetAppDecl(t) as VCExprLabelOp).label;
}
public static Sort GetSort(this Term t)
{
return t.Type;
}
public static TermKind GetKind(this Term t)
{
if (t is Microsoft.Boogie.VCExprAST.VCExprNAry)
return TermKind.App;
return TermKind.Other;
}
public static bool IsFunctionApp(this Term t)
{
return t.GetKind() == TermKind.App && t.GetAppDecl().GetKind() == DeclKind.Uninterpreted;
}
public static bool IsFalse(this Term t)
{
return t == VCExpressionGenerator.False;
}
public static Term VCExprToTerm(this Microsoft.Boogie.ProverContext ctx, VCExpr e, LineariserOptions lin){
return e;
}
}
public class Context : Microsoft.Boogie.VCExpressionGenerator
{
public Term MkTrue()
{
return VCExpressionGenerator.True;
}
public Term MkFalse()
{
return VCExpressionGenerator.False;
}
public List<Term> axioms = new List<Term>();
public void AddAxiom(Term ax)
{
axioms.Add(ax);
}
public void RemoveAxiom(Term ax)
{
axioms.Remove(ax);
}
public FuncDecl MkFuncDecl(string name, FuncDecl f)
{
Function h = (f as VCExprBoogieFunctionOp).Func;
Function g = new Function(Token.NoToken, name, h.InParams, h.OutParams[0]);
return BoogieFunctionOp(g);
}
public FuncDecl MkFuncDecl(string name, Sort rng)
{
Function g = new Function(Token.NoToken, name, new VariableSeq(), new Constant(Token.NoToken, new TypedIdent(Token.NoToken, "dummy",rng)));
return BoogieFunctionOp(g);
}
public Term MkApp(FuncDecl f, Term[] args)
{
return Function(f, args);
}
public Term MkApp(FuncDecl f, Term[] args, Type[]/*!*/ typeArguments)
{
return Function(f, args, typeArguments);
}
public Term MkApp(FuncDecl f, Term arg)
{
return Function(f, arg);
}
public Term CloneApp(Term t, Term[] args)
{
var f = t.GetAppDecl();
var typeArgs = (t as VCExprNAry).TypeArguments;
if (typeArgs != null && typeArgs.Count > 0)
{
return MkApp(f, args, typeArgs.ToArray());
}
else
{
return MkApp(f, args);
}
}
public Term MkAnd(Term[] args)
{
if (args.Length == 0) return True;
Term res = args[0];
for (int i = 1; i < args.Length; i++)
res = And(res, args[i]);
return res;
}
public Term MkAnd(Term arg1, Term arg2)
{
return And(arg1, arg2);
}
public Term MkNot(Term arg1)
{
return Not(arg1);
}
public Term MkImplies(Term arg1, Term arg2)
{
return Implies(arg1, arg2);
}
public Term MkEq(Term arg1, Term arg2)
{
return Eq(arg1, arg2);
}
public Sort MkBoolSort()
{
return Type.Bool;
}
public Term MkConst(string name, Sort sort)
{
return Variable(name, sort);
}
public Term MkForall(Term[] bounds, Term body)
{
List<VCExprVar> vbs = new List<VCExprVar>();
foreach(var v in bounds)
vbs.Add(v as VCExprVar);
return Forall(vbs,new List<VCTrigger>(), body);
}
public Term MkExists(Term[] bounds, Term body)
{
List<VCExprVar> vbs = new List<VCExprVar>();
foreach (var v in bounds)
vbs.Add(v as VCExprVar);
return Exists(vbs, new List<VCTrigger>(), body);
}
};
}
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