protected override Expression VisitBinaryExpression(BinaryExpression expression)
{
var currentlyInBooleanExpression = _inBooleanExpression;
var ret = new BooleanFlagExpression(false);
switch (expression.NodeType)
{
case ExpressionType.Equal:
case ExpressionType.NotEqual:
_inBooleanExpression = false;
ret =
new BooleanFlagExpression(
(
// Allowed: x.prop=constant
(expression.Left is MemberExpression && expression.Right is ConstantExpression) ||
// Allowed: x.prop=y.other_prop
(expression.Left is MemberExpression && expression.Right is MemberExpression)
) &&
// Check left and right expression content are optimisable
IsTrue(VisitExpression(expression.Left)) &&
IsTrue(VisitExpression(expression.Right)));
break;
case ExpressionType.OrElse:
case ExpressionType.AndAlso:
_inBooleanExpression = true;
ret =
new BooleanFlagExpression(
// Check left and right expression content are optimisable
IsTrue(VisitExpression(expression.Left)) &&
IsTrue(VisitExpression(expression.Right)));
break;
}
_inBooleanExpression = currentlyInBooleanExpression;
return ret;
}
protected override Expression VisitBinaryExpression(BinaryExpression expression)
{
var currentlyInBooleanExpression = _inBooleanExpression;
var ret = new BooleanFlagExpression(false);
switch (expression.NodeType)
{
case ExpressionType.Equal:
case ExpressionType.NotEqual:
_inBooleanExpression = false;
ret =
new BooleanFlagExpression(
(
// Allowed: x.prop=constant
(expression.Left is MemberExpression && expression.Right is ConstantExpression) ||
// Allowed: x.prop=y.other_prop
(expression.Left is MemberExpression && expression.Right is MemberExpression)
) &&
// Check left and right expression content are optimisable
IsTrue(VisitExpression(expression.Left)) &&
IsTrue(VisitExpression(expression.Right)));
break;
case ExpressionType.OrElse:
case ExpressionType.AndAlso:
_inBooleanExpression = true;
ret =
new BooleanFlagExpression(
// Check left and right expression content are optimisable
IsTrue(VisitExpression(expression.Left)) &&
IsTrue(VisitExpression(expression.Right)));
break;
}
_inBooleanExpression = currentlyInBooleanExpression;
return(ret);
}
