public virtual void AfterVisit(SwitchStatement node)
{
this.AfterVisitCatchAll(node);
}
public virtual void BeforeVisit(SwitchStatement node)
{
this.BeforeVisitCatchAll(node);
}
public override void AfterVisit(SwitchStatement node)
{
//In the case of a switch statement with no cases, the default block always executes and the expression should be evaluated too, in case there are side effects.
//Note: Can't pass an empty cases collection to Expression.Switch() - an ArgumentException will result.
if (node.Cases.Length == 0)
{
var notSwitchExprs = new List<Expression>();
if (node.DefaultStatementBlock != null)
notSwitchExprs.Add(_expressionStack.Pop());
notSwitchExprs.Add(_expressionStack.Pop());
_expressionStack.Push(node, MaybeBlock(notSwitchExprs));
return;
}
Expression defaultBlock = null;
if (node.DefaultStatementBlock != null)
defaultBlock = _expressionStack.Pop();
var cases = _expressionStack.Pop(node.Cases.Length, false).Cast<ContainerPseudoExpression<System.Linq.Expressions.SwitchCase>>().Select(container => container.ContainedItem).ToList();
var switchExpr = _expressionStack.Pop();
MethodInfo comparerMethodInfo = typeof(RuntimeHelpers).GetMethod("HappyEq");
_expressionStack.Push(node, Expression.Switch(switchExpr, defaultBlock, comparerMethodInfo, cases));
base.AfterVisit(node);
}
