protected virtual Expression CompileDereference(Compiler compiler, Frame frame, Expression left, Parse.BinaryExpression expression, System.Type typeHint)
{
left = compiler.MaterializeReference(left);
var local = compiler.AddFrame(frame, expression);
var memberType = left.Type.GenericTypeArguments[0];
var parameters = new List<ParameterExpression>();
var valueParam = compiler.CreateValueParam(expression, local, left, memberType);
parameters.Add(valueParam);
var indexParam = compiler.CreateIndexParam(expression, local);
parameters.Add(indexParam);
var right =
compiler.MaterializeReference
(
compiler.CompileExpression(local, expression.Right, typeHint)
);
var selection = Expression.Lambda(right, parameters);
var select =
typeof(Enumerable).GetMethodExt
(
"Select",
new System.Type[] { typeof(IEnumerable<ReflectionUtility.T>), typeof(Func<ReflectionUtility.T, int, ReflectionUtility.T>) }
);
select = select.MakeGenericMethod(memberType, selection.ReturnType);
return Expression.Call(select, left, selection);
}
public override Expression CompileBinaryExpression(Compiler compiler, Frame frame, Expression left, Parse.BinaryExpression expression, System.Type typeHint)
{
switch (expression.Operator)
{
case Parse.Operator.Equal:
case Parse.Operator.NotEqual:
left = compiler.MaterializeReference(left);
var right = compiler.MaterializeReference(compiler.CompileExpression(frame, expression.Right));
switch (expression.Operator)
{
case Parse.Operator.Equal: return Expression.Equal(left, right);
case Parse.Operator.NotEqual: return Expression.NotEqual(left, right);
default: throw new NotSupportedException();
}
case Parse.Operator.Dereference: return CompileDereference(compiler, frame, left, expression, typeHint);
default: throw new NotSupportedException(String.Format("Operator {0} is not supported.", expression.Operator));
}
}
public override Expression CompileBinaryExpression(Compiler compiler, Frame frame, Expression left, Parse.BinaryExpression expression, System.Type typeHint)
{
left = compiler.MaterializeReference(left);
switch (expression.Operator)
{
case Parse.Operator.Addition:
case Parse.Operator.Subtract:
case Parse.Operator.Multiply:
case Parse.Operator.Modulo:
case Parse.Operator.Divide:
case Parse.Operator.Power:
case Parse.Operator.BitwiseAnd:
case Parse.Operator.And:
case Parse.Operator.BitwiseOr:
case Parse.Operator.Or:
case Parse.Operator.BitwiseXor:
case Parse.Operator.Xor:
case Parse.Operator.ShiftLeft:
case Parse.Operator.ShiftRight:
{
var right = compiler.MaterializeReference(compiler.CompileExpression(frame, expression.Right, typeHint));
return CompileOperator(left, right, expression.Operator);
}
case Parse.Operator.Equal:
case Parse.Operator.NotEqual:
case Parse.Operator.InclusiveGreater:
case Parse.Operator.InclusiveLess:
case Parse.Operator.Greater:
case Parse.Operator.Less:
{
var right = compiler.MaterializeReference(compiler.CompileExpression(frame, expression.Right)); // (no type hint)
return CompileOperator(left, right, expression.Operator);
}
default: throw new NotSupportedException(String.Format("Operator {0} is not supported.", expression.Operator));
}
}
private Expression CompileDereference(Compiler compiler, Frame frame, Expression left, Parse.BinaryExpression expression, System.Type typeHint)
{
left = compiler.MaterializeReference(left);
var local = compiler.AddFrame(frame, expression);
foreach (var field in left.Type.GetFields(BindingFlags.Public | BindingFlags.Instance))
{
local.Add(expression, Name.FromNative(field.Name), field);
var fieldExpression = Expression.Field(left, field);
compiler.ExpressionsBySymbol.Add(field, fieldExpression);
}
return compiler.CompileExpression(local, expression.Right, typeHint);
}
public override Expression CompileUnaryExpression(Compiler compiler, Frame frame, Expression inner, Parse.UnaryExpression expression, System.Type typeHint)
{
inner = compiler.MaterializeReference(inner);
switch (expression.Operator)
{
case Parse.Operator.Exists:
return Expression.GreaterThan
(
Expression.Property(inner, typeof(ICollection<>).MakeGenericType(inner.Type).GetProperty("Count")),
Expression.Constant(0)
);
case Parse.Operator.IsNull: return Expression.Constant(false);
default: throw new NotSupportedException(String.Format("Operator {0} is not supported.", expression.Operator));
}
}
public override Expression CompileUnaryExpression(Compiler compiler, Frame frame, Expression inner, Parse.UnaryExpression expression, System.Type typeHint)
{
inner = compiler.MaterializeReference(inner);
switch (expression.Operator)
{
case Parse.Operator.Exists: return Expression.Constant(true);
case Parse.Operator.IsNull: return Expression.Constant(false);
case Parse.Operator.Negate: return Expression.Negate(inner);
case Parse.Operator.Not: return Expression.Not(inner);
//case Parse.Operator.Successor:
//case Parse.Operator.Predicessor:
default: throw new NotSupportedException(String.Format("Operator {0} is not supported.", expression.Operator));
}
}
