private static IEnumerable <ProofState> UpdateLocalValue(UpdateStmt us, ProofState state)
{
Contract.Requires <ArgumentNullException>(us != null, "stmt");
Contract.Requires <ArgumentNullException>(state != null, "state");
Contract.Requires <ArgumentException>(state.IsLocalAssignment(us), "stmt");
foreach (var item in us.Rhss)
{
int index = us.Rhss.IndexOf(item);
Contract.Assert(us.Lhss.ElementAtOrDefault(index) != null, "register var err");
var exprRhs = item as ExprRhs;
if (exprRhs?.Expr is ApplySuffix)
{
var aps = (ApplySuffix)exprRhs.Expr;
foreach (var result in EvaluateTacnyExpression(state, aps))
{
state.UpdateLocal(((NameSegment)us.Lhss[index]).Name, result);
}
}
else if (exprRhs?.Expr is Dafny.LiteralExpr)
{
state.UpdateLocal(((NameSegment)us.Lhss[index]).Name, (Dafny.LiteralExpr)exprRhs?.Expr);
}
else
{
state.UpdateLocal(((NameSegment)us.Lhss[index]).Name, exprRhs?.Expr);
}
}
yield return(state.Copy());
}
private static IEnumerable<ProofState> UpdateLocalValue(UpdateStmt us, ProofState state) {
Contract.Requires<ArgumentNullException>(us != null, "stmt");
Contract.Requires<ArgumentNullException>(state != null, "state");
Contract.Requires<ArgumentException>(state.IsLocalAssignment(us), "stmt");
foreach (var item in us.Rhss) {
int index = us.Rhss.IndexOf(item);
Contract.Assert(us.Lhss.ElementAtOrDefault(index) != null, "register var err");
var exprRhs = item as ExprRhs;
if (exprRhs?.Expr is ApplySuffix) {
var aps = (ApplySuffix)exprRhs.Expr;
foreach (var result in EvaluateTacnyExpression(state, aps)) {
state.UpdateLocal(((NameSegment)us.Lhss[index]).Name, result);
}
} else if (exprRhs?.Expr is Dafny.LiteralExpr) {
state.UpdateLocal(((NameSegment)us.Lhss[index]).Name, (Dafny.LiteralExpr)exprRhs?.Expr);
} else {
state.UpdateLocal(((NameSegment)us.Lhss[index]).Name, exprRhs?.Expr);
}
}
yield return state.Copy();
}