protected override Expression VisitIteratorExpression(IteratorExpression iex)
{
var iteratorBindingContext = Expression.Variable(typeof(BindingContext), "context");
return Expression.Block(
new ParameterExpression[] {
iteratorBindingContext
},
Expression.IfThenElse(
Expression.NotEqual(Expression.TypeAs(iex.Sequence, typeof(IEnumerable)), Expression.Constant(null)),
GetEnumerableIterator(iteratorBindingContext, iex),
GetObjectIterator(iteratorBindingContext, iex))
);
}
protected override Expression VisitIteratorExpression(IteratorExpression iex)
{
var iteratorBindingContext = Expression.Variable(typeof(BindingContext), "context");
return(Expression.Block(
new ParameterExpression[] {
iteratorBindingContext
},
Expression.IfThenElse(
Expression.NotEqual(Expression.TypeAs(iex.Sequence, typeof(IEnumerable)), Expression.Constant(null)),
GetEnumerableIterator(iteratorBindingContext, iex),
GetObjectIterator(iteratorBindingContext, iex))
));
}
private Expression GetObjectIterator(Expression contextParameter, IteratorExpression iex)
{
var fb = new FunctionBuilder(_context.Configuration);
return Expression.Block(
Expression.Assign(contextParameter,
Expression.New(
typeof(ObjectEnumeratorBindingContext).GetConstructor(new[] { typeof(BindingContext) }),
new Expression[] { _context.BindingContext })),
Expression.Call(
new Action<ObjectEnumeratorBindingContext, object, Action<TextWriter, object>, Action<TextWriter, object>>(Iterate).Method,
new Expression[] {
Expression.Convert(contextParameter, typeof(ObjectEnumeratorBindingContext)),
iex.Sequence,
fb.Compile(new [] { iex.Template }, contextParameter),
fb.Compile(new [] { iex.IfEmpty }, _context.BindingContext)
}));
}
private Expression GetObjectIterator(Expression contextParameter, IteratorExpression iex)
{
var fb = new FunctionBuilder(_context.Configuration);
return(Expression.Block(
Expression.Assign(contextParameter,
Expression.New(
typeof(ObjectEnumeratorBindingContext).GetConstructor(new[] { typeof(BindingContext) }),
new Expression[] { _context.BindingContext })),
Expression.Call(
new Action <ObjectEnumeratorBindingContext, object, Action <TextWriter, object>, Action <TextWriter, object> >(Iterate).Method,
new Expression[] {
Expression.Convert(contextParameter, typeof(ObjectEnumeratorBindingContext)),
iex.Sequence,
fb.Compile(new [] { iex.Template }, contextParameter),
fb.Compile(new [] { iex.IfEmpty }, _context.BindingContext)
})));
}
protected virtual Expression VisitIteratorExpression(IteratorExpression iex)
{
return iex;
}
protected virtual Expression VisitIteratorExpression(IteratorExpression iex)
{
return(iex);
}