/// <summary>
/// Performs the binding of the dynamic unary operation.
/// </summary>
/// <param name="binder">An instance of the <see cref="UnaryOperationBinder"/> that represents the details of the dynamic operation.</param>
/// <returns>The new <see cref="DynamicMetaObject"/> representing the result of the binding.</returns>
public override DynamicMetaObject BindUnaryOperation(UnaryOperationBinder binder)
{
if (binder == null)
{
throw DiagnosticUtility.ExceptionUtility.ThrowHelperError(new ArgumentNullException("binder"));
}
Expression operExpression = null;
JsonValue jsonValue = this.Value as JsonValue;
if (jsonValue is JsonPrimitive)
{
OperationSupport supportValue = GetUnaryOperationSupport(binder.Operation, jsonValue);
if (supportValue == OperationSupport.Supported)
{
Type operationReturnType = this.GetUnaryOperationReturnType(binder);
Expression instance = Expression.Convert(this.Expression, this.LimitType);
Expression thisExpression = Expression.Convert(Expression.Call(instance, ReadAsMethodInfo, new Expression[] { Expression.Constant(operationReturnType) }), operationReturnType);
operExpression = JsonValueDynamicMetaObject.GetUnaryOperationExpression(binder.Operation, thisExpression);
}
}
if (operExpression == null)
{
operExpression = JsonValueDynamicMetaObject.GetOperationErrorExpression(OperationSupport.NotSupportedOnJsonType, binder.Operation, jsonValue, null);
}
operExpression = Expression.Convert(operExpression, binder.ReturnType);
return(new DynamicMetaObject(operExpression, this.DefaultRestrictions));
}
/// <summary>
/// Returns an expression representing a 'throw' instruction based on the specified <see cref="OperationSupport"/> value.
/// </summary>
/// <param name="supportValue">The <see cref="OperationSupport"/> value.</param>
/// <param name="operation">The operation type.</param>
/// <param name="thisValue">The operation left operand.</param>
/// <param name="operand">The operation right operand.</param>
/// <returns>A <see cref="Expression"/> representing a 'throw' instruction.</returns>
private static Expression GetOperationErrorExpression(OperationSupport supportValue, ExpressionType operation, JsonValue thisValue, object operand)
{
string exceptionMessage;
string operandTypeName = operand != null?operand.GetType().FullName : "<null>";
switch (supportValue)
{
default:
case OperationSupport.NotSupported:
case OperationSupport.NotSupportedOnJsonType:
case OperationSupport.NotSupportedOnValueType:
exceptionMessage = SG.GetString(SR.OperatorNotDefinedForJsonType, operation, thisValue.JsonType);
break;
case OperationSupport.NotSupportedOnOperand:
exceptionMessage = SG.GetString(SR.OperatorNotAllowedOnOperands, operation, thisValue.GetType().FullName, operandTypeName);
break;
}
return(Expression.Throw(Expression.Constant(new InvalidOperationException(exceptionMessage)), typeof(object)));
}
/// <summary>
/// Performs the binding of the dynamic binary operation.
/// </summary>
/// <param name="binder">An instance of the <see cref="BinaryOperationBinder"/> that represents the details of the dynamic operation.</param>
/// <param name="arg">An instance of the <see cref="DynamicMetaObject"/> representing the right hand side of the binary operation.</param>
/// <returns>The new <see cref="DynamicMetaObject"/> representing the result of the binding.</returns>
public override DynamicMetaObject BindBinaryOperation(BinaryOperationBinder binder, DynamicMetaObject arg)
{
if (binder == null)
{
throw DiagnosticUtility.ExceptionUtility.ThrowHelperError(new ArgumentNullException("binder"));
}
if (arg == null)
{
throw DiagnosticUtility.ExceptionUtility.ThrowHelperError(new ArgumentNullException("arg"));
}
Expression thisExpression = this.Expression;
Expression otherExpression = arg.Expression;
Expression operExpression = null;
JsonValue otherValue = arg.Value as JsonValue;
JsonValue thisValue = this.Value as JsonValue;
OperationSupport supportValue = JsonValueDynamicMetaObject.GetBinaryOperationSupport(binder.Operation, thisValue, arg.Value);
if (supportValue == OperationSupport.Supported)
{
if (otherValue != null)
{
if (thisValue is JsonPrimitive && otherValue is JsonPrimitive)
{
//// operation on primitive types.
JsonValueDynamicMetaObject.GetBinaryOperandExpressions(binder.Operation, this, arg, ref thisExpression, ref otherExpression);
}
else
{
//// operation on JsonValue types.
thisExpression = Expression.Convert(thisExpression, typeof(JsonValue));
otherExpression = Expression.Convert(otherExpression, typeof(JsonValue));
}
}
else
{
if (arg.Value != null)
{
//// operation on JSON primitive and CLR primitive
JsonValueDynamicMetaObject.GetBinaryOperandExpressions(binder.Operation, this, arg, ref thisExpression, ref otherExpression);
}
else
{
//// operation on JsonValue and null.
thisExpression = Expression.Convert(thisExpression, typeof(JsonValue));
if (thisValue.JsonType == JsonType.Default)
{
thisExpression = Expression.Constant(null);
}
}
}
operExpression = JsonValueDynamicMetaObject.GetBinaryOperationExpression(binder.Operation, thisExpression, otherExpression);
}
if (operExpression == null)
{
operExpression = JsonValueDynamicMetaObject.GetOperationErrorExpression(supportValue, binder.Operation, thisValue, arg.Value);
}
operExpression = Expression.Convert(operExpression, typeof(object));
return(new DynamicMetaObject(operExpression, this.DefaultRestrictions));
}
