public void ForContinue()
{
var counter = new Counter();
var c = Expression.Parameter(typeof(Counter), "c");
var l = Expression.Parameter(typeof(int), "l");
var i = Expression.Variable(typeof(int), "i");
var for_break = Expression.Label("for_break");
var for_continue = Expression.Label("for_continue");
var hitcounter = Expression.Lambda <Action <Counter, int> >(
ExpressionEx.For(
i,
Expression.Constant(0),
Expression.LessThan(i, l),
Expression.PreIncrementAssign(i),
Expression.Block(
Expression.Condition(
Expression.Equal(Expression.Modulo(i, Expression.Constant(2)), Expression.Constant(0)),
Expression.Call(c, typeof(Counter).GetMethod("Hit", Type.EmptyTypes)),
Expression.Goto(for_continue))),
for_break,
for_continue),
c, l).Compile();
hitcounter(counter, 10);
Assert.Equal(5, counter.Count);
}
public void For()
{
var l = Expression.Parameter(typeof(int), "l");
var i = Expression.Variable(typeof(int), "i");
var lambda = Expression.Lambda <Action <int> >(
ExpressionEx.For(
i,
Expression.Constant(0),
Expression.LessThan(i, l),
Expression.PreIncrementAssign(i),
Expression.Call(typeof(Console).GetMethod("WriteLine", new[] { typeof(int) }), i)),
l);
AssertExpression(@"
void (int l)
{
for (int i = 0; i < l; ++i)
{
Console.WriteLine(i);
}
}
", lambda);
}
public void Never()
{
var counter = new Counter();
var c = Expression.Parameter(typeof(Counter), "c");
var l = Expression.Parameter(typeof(int), "l");
var i = Expression.Variable(typeof(int), "i");
var hitcounter = Expression.Lambda <Action <Counter, int> >(
ExpressionEx.For(
i,
Expression.Constant(0),
Expression.LessThan(i, l),
Expression.PreIncrementAssign(i),
Expression.Call(c, typeof(Counter).GetMethod("Hit", Type.EmptyTypes))),
c, l).Compile();
hitcounter(counter, 0);
Assert.Equal(0, counter.Count);
}
