/// <summary>
/// Evalaute this node and return result.
/// </summary>
/// <param name="thisObject">Reference to object that is exposed as 'this'.</param>
/// <returns>Result value and type of that result.</returns>
public override EvalResult Evaluate(object thisObject)
{
EvalResult target = this[0].Evaluate(thisObject);
EvalNodeArgList args = (EvalNodeArgList)this[1];
if (target.Value == null)
{
throw new ApplicationException("Cannot access '" + Identifier + "' on a value of 'null'.");
}
// Evalute all the arguments
EvalResult[] results = new EvalResult[args.Count];
for (int i = 0; i < results.Length; i++)
{
results[i] = args[i].Evaluate(thisObject);
}
if (target.Value is Type)
{
return(EvaluateTypeMethod(target, results));
}
else
{
return(EvaluateObjectMethod(target, results));
}
}
private EvalResult EvaluateTypeMember(EvalResult target)
{
// Extract the type we are working against
Type t = target.Value as Type;
// Try and find the static field for our identifier
FieldInfo fi = t.GetField(Identifier, BindingFlags.Static | BindingFlags.Public | BindingFlags.GetField);
if (fi != null)
{
// Grab the value of the static field
EvalResult ret = new EvalResult();
ret.Value = fi.GetValue(null);
return(DiscoverTypeCode(ret));
}
else
{
// Try and find the static property for our identifier
PropertyInfo pi = t.GetProperty(Identifier, BindingFlags.Static | BindingFlags.Public | BindingFlags.GetProperty);
if (pi == null)
{
throw new ApplicationException("Cannot find static public field/property called '" + Identifier + "' for type '" + t.ToString() + "'.");
}
else
{
// Grab the value of the static property
EvalResult ret = new EvalResult();
ret.Value = pi.GetValue(null, null);
return(DiscoverTypeCode(ret));
}
}
}
private EvalResult EvaluatePlus(EvalResult ret)
{
// Unary plus means we do nothing as long as the type is valid
switch (ret.Type)
{
case TypeCode.Char:
if (_language == Language.VBNet)
{
throw new ApplicationException("Operation '+' cannot be applied to operand of type '" + ret.Type.ToString() + "'.");
}
else
{
break;
}
case TypeCode.Byte:
case TypeCode.SByte:
case TypeCode.Int16:
case TypeCode.Int32:
case TypeCode.Int64:
case TypeCode.UInt16:
case TypeCode.UInt32:
case TypeCode.UInt64:
case TypeCode.Single:
case TypeCode.Double:
case TypeCode.Decimal:
break;
default:
throw new ApplicationException("Operation '+' cannot be applied to operand of type '" + ret.Type.ToString() + "'.");
}
return(ret);
}
private EvalResult EvaluateObjectArray(EvalResult target,
EvalResult[] args,
object thisObject)
{
// We know the value is an actual array instance
Array array = (Array)target.Value;
// Must have same number of arguments as the array rank
if (array.Rank != args.Length)
{
throw new ApplicationException("Array expects '" + array.Rank.ToString() + "' indices but '" + args.Length.ToString() + "' have been specified.");
}
// Construct the set of indices for accessing array
long[] indices = new long[args.Length];
for (int i = 0; i < args.Length; i++)
{
indices[i] = ImplicitConverter.ConvertToInt64(args[i].Value, _language);
}
EvalResult ret = new EvalResult();
ret.Value = array.GetValue(indices);
return(DiscoverTypeCode(ret));
}
/// <summary>
/// Evalaute this node and return result.
/// </summary>
/// <param name="thisObject">Reference to object that is exposed as 'this'.</param>
/// <returns>Result value and type of that result.</returns>
public override EvalResult Evaluate(object thisObject)
{
// Get the result from evaluating the left side of operand
EvalResult left = this[0].Evaluate(thisObject);
// We can only handle an object result
if (left.Type != TypeCode.Object)
{
throw new ApplicationException("Null coalescing '??' requires a 'object' type for left operand.");
}
// If conditional is not null then return it
if (left.Value != null)
{
return(left);
}
else
{
// Get the result from evaluating the right side operand
EvalResult right = this[1].Evaluate(thisObject);
// We can only handle an object result
if (right.Type != TypeCode.Object)
{
throw new ApplicationException("Null coalescing '??' requires a 'object' type for right operand.");
}
return(right);
}
}
/// <summary>
/// Converts source values to a value for the binding target.
/// </summary>
/// <param name="values">The array of values that the source bindings produces.</param>
/// <param name="targetType">The type of the binding target property.</param>
/// <param name="parameter">The converter parameter to use.</param>
/// <param name="culture">The culture to use in the converter.</param>
/// <returns>A converted value.</returns>
public object Convert(object[] values, Type targetType, object parameter, CultureInfo culture)
{
try
{
// First time around we parse the evaluation input
if (_eval == null)
{
_eval = new Eval(_language);
_eval.ResolveIdentifier += new EventHandler <ResolveIdentifierEventArgs>(OnResolveIdentifier);
_eval.Parse(_expression);
}
// Every time we evaluate we could throw an exception. This is because each time around the
// bindings can provide values of different types. So first time round the binding has an
// integer and so works correctly but next time it could provide a string and cause a type
// error in the evaluation.
EvalResult ret = _eval.Evaluate(values);
// Null means we have no result to provide
if (ret == null)
{
return(DependencyProperty.UnsetValue);
}
else
{
// If the return type is different to the target type
if (ret.Value.GetType() != targetType)
{
// If possible we perform an implicit conversion to the target
TypeCode targetTypeCode = Type.GetTypeCode(targetType);
if (ImplicitConverter.CanConvertTo(targetTypeCode, ret.Value, _language))
{
ret.Value = ImplicitConverter.ConvertTo(targetTypeCode, ret.Value, _language);
}
else
{
// Use type converters to attempt an explicit conversion
ret.Value = ConvertUsingConverter(ret, targetType);
}
}
return(ret.Value);
}
}
catch (ParseException pe)
{
Console.WriteLine("EvalBinding Parsing Exception : {0} : Index '{1}'", pe.Message, pe.Index);
return(DependencyProperty.UnsetValue);
}
catch (Exception e)
{
Console.WriteLine("EvalBinding Evaluation Exception : {0} : Eval '{1}'", e.Message, _eval.ToString());
return(DependencyProperty.UnsetValue);
}
}
private EvalResult EvaluateComplement(EvalResult ret)
{
// Unary plus means we do nothing as long as the type is valid
switch (ret.Type)
{
case TypeCode.Byte:
ret.Value = ~(Byte)ret.Value;
break;
case TypeCode.SByte:
ret.Value = ~(SByte)ret.Value;
break;
case TypeCode.Char:
if (_language != Language.VBNet)
{
ret.Value = ~(Char)ret.Value;
}
else
{
throw new ApplicationException("Operation '~' cannot be applied to operand of type '" + ret.Type.ToString() + "'.");
}
break;
case TypeCode.Int16:
ret.Value = ~(Int16)ret.Value;
break;
case TypeCode.Int32:
ret.Value = ~(Int32)ret.Value;
break;
case TypeCode.Int64:
ret.Value = ~(Int64)ret.Value;
break;
case TypeCode.UInt16:
ret.Value = ~(UInt16)ret.Value;
break;
case TypeCode.UInt32:
ret.Value = ~(UInt32)ret.Value;
break;
case TypeCode.UInt64:
ret.Value = ~(UInt64)ret.Value;
break;
default:
throw new ApplicationException("Operation '~' cannot be applied to operand of type '" + ret.Type.ToString() + "'.");
}
return(ret);
}
/// <summary>
/// Evalaute this node and return result.
/// </summary>
/// <param name="thisObject">Reference to object that is exposed as 'this'.</param>
/// <returns>Result value and type of that result.</returns>
public override EvalResult Evaluate(object thisObject)
{
// Get the result from evaluating both children
EvalResult left = this[0].Evaluate(thisObject);
EvalResult right = this[1].Evaluate(thisObject);
// Convert both sides to a string if possible
string leftString = (left.Value != null ? left.Value.ToString() : string.Empty);
string rightString = (right.Value != null ? right.Value.ToString() : string.Empty);
return(new EvalResult(TypeCode.String, leftString + rightString));
}
/// <summary>
/// Update the TypeCode to reflect the contents of the Value fields.
/// </summary>
/// <param name="ret">Instance to update.</param>
/// <returns>Instance that has been updated.</returns>
protected EvalResult DiscoverTypeCode(EvalResult ret)
{
// Fill in the correct type code for the value
if (ret.Value == null)
{
ret.Type = TypeCode.Object;
}
else
{
ret.Type = Type.GetTypeCode(ret.Value.GetType());
}
return(ret);
}
private EvalResult EvaluateNot(EvalResult ret)
{
// Unary plus means we do nothing as long as the type is valid
switch (ret.Type)
{
case TypeCode.Boolean:
ret.Value = !(bool)ret.Value;
break;
default:
throw new ApplicationException("Logical invert cannot be applied to operand of type '" + ret.Type.ToString() + "'.");
}
return(ret);
}
/// <summary>
/// Evalaute this node and return result.
/// </summary>
/// <param name="thisObject">Reference to object that is exposed as 'this'.</param>
/// <returns>Result value and type of that result.</returns>
public override EvalResult Evaluate(object thisObject)
{
EvalResult target = this[0].Evaluate(thisObject);
if (target.Value == null)
{
throw new ApplicationException("Cannot access '" + Identifier + "' on a value of 'null'.");
}
else if (target.Value is Type)
{
return(EvaluateTypeMember(target));
}
else
{
return(EvaluateObjectMember(target));
}
}
/// <summary>
/// Evalaute this node and return result.
/// </summary>
/// <param name="thisObject">Reference to object that is exposed as 'this'.</param>
/// <returns>Result value and type of that result.</returns>
public override EvalResult Evaluate(object thisObject)
{
EvalResult target = this[0].Evaluate(thisObject);
EvalNodeArgList args = (EvalNodeArgList)this[1];
if (target.Value == null)
throw new ApplicationException("Cannot access '" + Identifier + "' on a value of 'null'.");
// Evalute all the arguments
EvalResult[] results = new EvalResult[args.Count];
for (int i = 0; i < results.Length; i++)
results[i] = args[i].Evaluate(thisObject);
if (target.Value is Type)
return EvaluateTypeMethod(target, results);
else
return EvaluateObjectMethod(target, results);
}
private EvalResult EvalShiftOp(UInt64 x, int count)
{
EvalResult ret = new EvalResult(TypeCode.UInt64, null);
switch (Operation)
{
case ShiftOp.Left:
ret.Value = x << count;
break;
case ShiftOp.Right:
ret.Value = x >> count;
break;
default:
throw new ApplicationException("Unrecognized 'UInt64' type shift operation '" + OperationString);
}
return(ret);
}
/// <summary>
/// Evalaute this node and return result.
/// </summary>
/// <param name="thisObject">Reference to object that is exposed as 'this'.</param>
/// <returns>Result value and type of that result.</returns>
public override EvalResult Evaluate(object thisObject)
{
// Get the result from evaluating the condition
EvalResult cond = this[0].Evaluate(thisObject);
// We can only handle a boolean result
if (cond.Type != TypeCode.Boolean)
{
throw new ApplicationException("Conditional '?:' requires a 'bool' type for evaluating.");
}
// Decide which value to return based on boolean result
if ((bool)cond.Value)
{
return(this[1].Evaluate(thisObject));
}
else
{
return(this[2].Evaluate(thisObject));
}
}
/// <summary>
/// Evalaute this node and return result.
/// </summary>
/// <param name="thisObject">Reference to object that is exposed as 'this'.</param>
/// <returns>Result value and type of that result.</returns>
public override EvalResult Evaluate(object thisObject)
{
// Get the result from evaluating the single child
EvalResult ret = this[0].Evaluate(thisObject);
switch (Operation)
{
case UnaryOp.Plus:
return(EvaluatePlus(ret));
case UnaryOp.Minus:
return(EvaluateMinus(ret));
case UnaryOp.Not:
return(EvaluateNot(ret));
case UnaryOp.Complement:
return(EvaluateComplement(ret));
}
return(ret);
}
/// <summary>
/// Evalaute this node and return result.
/// </summary>
/// <param name="thisObject">Reference to object that is exposed as 'this'.</param>
/// <returns>Result value and type of that result.</returns>
public override EvalResult Evaluate(object thisObject)
{
// Get the result from evaluating both children
EvalResult left = this[0].Evaluate(thisObject);
EvalResult right = this[1].Evaluate(thisObject);
// Both sides must be converted to doubles
if (!ImplicitConverter.CanConvertToDouble(left.Value, _language))
{
throw new ApplicationException("Cannot convert '" + left.Type.ToString() + "' type to 'Double' for left side of exponent '^' operation.");
}
if (!ImplicitConverter.CanConvertToDouble(right.Value, _language))
{
throw new ApplicationException("Cannot convert '" + left.Type.ToString() + "' type to 'Double' for right side of exponent '^' operation.");
}
double leftDouble = ImplicitConverter.ConvertToDouble(left.Value, _language);
double rightDouble = ImplicitConverter.ConvertToDouble(right.Value, _language);
return(new EvalResult(TypeCode.Double, Math.Pow(leftDouble, rightDouble)));
}
/// <summary>
/// Evalaute this node and return result.
/// </summary>
/// <param name="thisObject">Reference to object that is exposed as 'this'.</param>
/// <returns>Result value and type of that result.</returns>
public override EvalResult Evaluate(object thisObject)
{
EvalResult target = this[0].Evaluate(thisObject);
EvalNodeArgList args = (EvalNodeArgList)this[1];
// We can only handle a target that is an object
if (target.Type != TypeCode.Object)
throw new ApplicationException("Array index cannot index a value of type '" + target.Type.ToString() + "'.");
else if (target.Value == null)
throw new ApplicationException("Array index cannot index a value of 'null'.");
else if (target.Value is Type)
throw new ApplicationException("Array index cannot index a 'type' object.");
// Evalute all the arguments
EvalResult[] results = new EvalResult[args.Count];
for (int i = 0; i < results.Length; i++)
results[i] = args[i].Evaluate(thisObject);
// Is this an actual array of a type?
if (target.Value.GetType().IsArray)
return EvaluateObjectArray(target, results, thisObject);
else
return EvaluateObjectInstance(target, results, thisObject);
}
/// <summary>
/// Evalaute this node and return result.
/// </summary>
/// <param name="thisObject">Reference to object that is exposed as 'this'.</param>
/// <returns>Result value and type of that result.</returns>
public override EvalResult Evaluate(object thisObject)
{
EvalResult target = this[0].Evaluate(thisObject);
EvalNodeArgList args = (EvalNodeArgList)this[1];
// We can only handle a target that is an object
if (target.Type != TypeCode.Object)
{
throw new ApplicationException("Array index cannot index a value of type '" + target.Type.ToString() + "'.");
}
else if (target.Value == null)
{
throw new ApplicationException("Array index cannot index a value of 'null'.");
}
else if (target.Value is Type)
{
throw new ApplicationException("Array index cannot index a 'type' object.");
}
// Evalute all the arguments
EvalResult[] results = new EvalResult[args.Count];
for (int i = 0; i < results.Length; i++)
{
results[i] = args[i].Evaluate(thisObject);
}
// Is this an actual array of a type?
if (target.Value.GetType().IsArray)
{
return(EvaluateObjectArray(target, results, thisObject));
}
else
{
return(EvaluateObjectInstance(target, results, thisObject));
}
}
private EvalResult EvaluateTypeMethod(EvalResult target, EvalResult[] args)
{
// Get all the static methods that might of interest to us
MethodInfo[] mis = ((Type)target.Value).GetMethods(BindingFlags.Static | BindingFlags.Public | BindingFlags.InvokeMethod);
return(EvaluateMethod(mis, null, args));
}
private EvalResult EvaluateMinus(EvalResult ret)
{
// Processing depends on the type we are provided with
switch (ret.Type)
{
case TypeCode.Byte:
ret.Value = 0 - ((Byte)ret.Value);
break;
case TypeCode.SByte:
ret.Value = 0 - ((SByte)ret.Value);
break;
case TypeCode.Char:
if (_language != Language.VBNet)
{
ret.Value = 0 - ((Char)ret.Value);
break;
}
else
{
throw new ApplicationException("Operation '-' cannot be applied to operand of type '" + ret.Type.ToString() + "'.");
}
case TypeCode.Int16:
ret.Value = 0 - ((Int16)ret.Value);
break;
case TypeCode.Int32:
ret.Value = 0 - ((Int32)ret.Value);
break;
case TypeCode.Int64:
ret.Value = 0 - ((Int64)ret.Value);
break;
case TypeCode.UInt16:
// Convert to long and subtract from zero
ret.Value = 0 - (Int64)((UInt16)ret.Value);
ret.Type = TypeCode.Int64;
break;
case TypeCode.UInt32:
// Convert to long and subtract from zero
ret.Value = 0 - (Int64)((UInt32)ret.Value);
ret.Type = TypeCode.Int64;
break;
case TypeCode.Single:
ret.Value = 0 - ((Single)ret.Value);
break;
case TypeCode.Double:
ret.Value = 0 - ((Double)ret.Value);
break;
case TypeCode.Decimal:
ret.Value = 0 - ((Decimal)ret.Value);
break;
default:
throw new ApplicationException("Operation '-' cannot be applied to operand of type '" + ret.Type.ToString() + "'.");
}
return(ret);
}
private EvalResult EvaluateMethod(MethodInfo[] mis, object target, EvalResult[] args)
{
if (mis == null)
{
if (target == null)
{
throw new ApplicationException("Cannot find static public method called '" + Identifier + "'.");
}
else
{
throw new ApplicationException("Cannot find instance public method called '" + Identifier + "'.");
}
}
MethodInfo callMi = null;
object[] callParams = null;
// Find methods that we could call
foreach (MethodInfo mi in mis)
{
// Matching name?
if (mi.Name == Identifier)
{
ParameterInfo[] pis = mi.GetParameters();
// Is the last parameter an array of params?
bool paramArray = (pis.Length > 0 ? pis[pis.Length - 1].IsDefined(typeof(ParamArrayAttribute), false) : false);
// It must have the same number of parameters as we have arguments
if (!paramArray && (pis.Length == args.Length))
{
// Match parameter types?
int i = 0;
int exact = 0;
object[] pisParams = new object[args.Length];
for (i = 0; i < pis.Length; i++)
{
TypeCode methodTc = Type.GetTypeCode(pis[i].ParameterType);
// Note how many parameters are an exact match
if (methodTc == args[i].Type)
{
pisParams[i] = args[i].Value;
exact++;
}
else
{
// If cannot be implicitly converted, then fail to match at all
if (ImplicitConverter.CanConvertTo(methodTc, args[i].Value, _language))
{
pisParams[i] = ImplicitConverter.ConvertTo(methodTc, args[i].Value, _language);
}
else
{
break;
}
}
}
// If all parameters exactly match
if (exact == pis.Length)
{
// Use this method
callMi = mi;
callParams = pisParams;
break;
}
// Remember the first compatible match we find
if ((i == pis.Length) && (callMi == null))
{
callMi = mi;
callParams = pisParams;
}
}
else if (paramArray)
{
// We can only handle packaging up a param array as an object array
int lastIndex = pis.Length - 1;
if (pis[lastIndex].ParameterType == typeof(object[]))
{
// Package up the extra parameters into an object array
object[] pisParams = new object[pis.Length];
object[] lastParams = new object[args.Length - lastIndex];
pisParams[lastIndex] = lastParams;
for (int j = 0; j < lastParams.Length; j++)
{
lastParams[j] = args[j + lastIndex].Value;
}
// Match parameter types for all but the last 'object[]' entry?
int i = 0;
int exact = 0;
for (i = 0; i < lastIndex; i++)
{
TypeCode methodTc = Type.GetTypeCode(pis[i].ParameterType);
// Note how many parameters are an exact match
if (methodTc == args[i].Type)
{
pisParams[i] = args[i].Value;
exact++;
}
else
{
// If cannot be implicitly converted, then fail to match at all
if (ImplicitConverter.CanConvertTo(methodTc, args[i].Value, _language))
{
pisParams[i] = ImplicitConverter.ConvertTo(methodTc, args[i].Value, _language);
}
else
{
break;
}
}
}
// If all parameters exactly match
if (exact == lastIndex)
{
// Use this method
callMi = mi;
callParams = pisParams;
break;
}
// Remember the first compatible match we find
if ((i == lastIndex) && (callMi == null))
{
callMi = mi;
callParams = pisParams;
}
}
}
}
}
if (callMi == null)
{
if (target == null)
{
throw new ApplicationException("Cannot find static public method called '" + Identifier + "' with matching parameters to those provided.");
}
else
{
throw new ApplicationException("Cannot find instance public method called '" + Identifier + "' with matching parameters to those provided.");
}
}
// Call the static method and return result
EvalResult ret = new EvalResult();
ret.Value = callMi.Invoke(target, callParams);
return(DiscoverTypeCode(ret));
}
private EvalResult EvaluateObjectMethod(EvalResult target, EvalResult[] args)
{
// Get all the instance methods that might of interest to us
MethodInfo[] mis = target.Value.GetType().GetMethods(BindingFlags.Instance | BindingFlags.Public | BindingFlags.InvokeMethod);
return(EvaluateMethod(mis, target.Value, args));
}
private EvalResult EvalShiftOp(UInt64 x, int count)
{
EvalResult ret = new EvalResult(TypeCode.UInt64, null);
switch (Operation)
{
case ShiftOp.Left:
ret.Value = x << count;
break;
case ShiftOp.Right:
ret.Value = x >> count;
break;
default:
throw new ApplicationException("Unrecognized 'UInt64' type shift operation '" + OperationString);
}
return ret;
}
private EvalResult EvaluateObjectMember(EvalResult target)
{
// Extract the type we are working against
Type t = target.Value.GetType();
// Try and find the instance field for our identifier
FieldInfo fi = t.GetField(Identifier, BindingFlags.Instance | BindingFlags.Public | BindingFlags.GetField);
if (fi != null)
{
// Grab the value of the static field
EvalResult ret = new EvalResult();
ret.Value = fi.GetValue(target.Value);
return DiscoverTypeCode(ret);
}
else
{
// Try and find the instance property for our identifier
PropertyInfo pi = t.GetProperty(Identifier, BindingFlags.Instance | BindingFlags.Public | BindingFlags.GetProperty);
if (pi == null)
throw new ApplicationException("Cannot find instance public field/property called '" + Identifier + "' for type '" + t.ToString() + "'.");
else
{
// Grab the value of the instance property
EvalResult ret = new EvalResult();
ret.Value = pi.GetValue(target.Value, null);
return DiscoverTypeCode(ret);
}
}
}
private object ConvertUsingConverter(EvalResult ret, Type targetType)
{
// Try and get a converter from the target type
TypeConverter converter = TypeDescriptor.GetConverter(targetType);
if (converter != null)
{
// Ask the converter to convert using the source type when possible, if not possible
// fallback to requesting a string version of the source be converted to the target
switch (ret.Type)
{
case TypeCode.Boolean:
if (converter.CanConvertFrom(typeof(Boolean)))
return converter.ConvertFrom((Boolean)ret.Value);
else if (converter.CanConvertFrom(typeof(String)))
return converter.ConvertFromString(ret.Value.ToString());
break;
case TypeCode.SByte:
if (converter.CanConvertFrom(typeof(SByte)))
return converter.ConvertFrom((SByte)ret.Value);
else if (converter.CanConvertFrom(typeof(String)))
return converter.ConvertFromString(ret.Value.ToString());
break;
case TypeCode.Byte:
if (converter.CanConvertFrom(typeof(Byte)))
return converter.ConvertFrom((Byte)ret.Value);
else if (converter.CanConvertFrom(typeof(String)))
return converter.ConvertFromString(ret.Value.ToString());
break;
case TypeCode.Char:
if (converter.CanConvertFrom(typeof(Char)))
return converter.ConvertFrom((Char)ret.Value);
else if (converter.CanConvertFrom(typeof(String)))
return converter.ConvertFromString(ret.Value.ToString());
break;
case TypeCode.Int16:
if (converter.CanConvertFrom(typeof(Int16)))
return converter.ConvertFrom((Int16)ret.Value);
else if (converter.CanConvertFrom(typeof(String)))
return converter.ConvertFromString(ret.Value.ToString());
break;
case TypeCode.Int32:
if (converter.CanConvertFrom(typeof(Int32)))
return converter.ConvertFrom((Int32)ret.Value);
else if (converter.CanConvertFrom(typeof(String)))
return converter.ConvertFromString(ret.Value.ToString());
break;
case TypeCode.Int64:
if (converter.CanConvertFrom(typeof(Int64)))
return converter.ConvertFrom((Int64)ret.Value);
else if (converter.CanConvertFrom(typeof(String)))
return converter.ConvertFromString(ret.Value.ToString());
break;
case TypeCode.UInt16:
if (converter.CanConvertFrom(typeof(UInt16)))
return converter.ConvertFrom((UInt16)ret.Value);
else if (converter.CanConvertFrom(typeof(String)))
return converter.ConvertFromString(ret.Value.ToString());
break;
case TypeCode.UInt32:
if (converter.CanConvertFrom(typeof(UInt32)))
return converter.ConvertFrom((UInt32)ret.Value);
else if (converter.CanConvertFrom(typeof(String)))
return converter.ConvertFromString(ret.Value.ToString());
break;
case TypeCode.UInt64:
if (converter.CanConvertFrom(typeof(UInt64)))
return converter.ConvertFrom((UInt64)ret.Value);
else if (converter.CanConvertFrom(typeof(String)))
return converter.ConvertFromString(ret.Value.ToString());
break;
case TypeCode.Single:
if (converter.CanConvertFrom(typeof(Single)))
return converter.ConvertFrom((Single)ret.Value);
else if (converter.CanConvertFrom(typeof(String)))
return converter.ConvertFromString(ret.Value.ToString());
break;
case TypeCode.Double:
if (converter.CanConvertFrom(typeof(Double)))
return converter.ConvertFrom((Double)ret.Value);
else if (converter.CanConvertFrom(typeof(String)))
return converter.ConvertFromString(ret.Value.ToString());
break;
case TypeCode.Decimal:
if (converter.CanConvertFrom(typeof(Decimal)))
return converter.ConvertFrom((Decimal)ret.Value);
else if (converter.CanConvertFrom(typeof(String)))
return converter.ConvertFromString(ret.Value.ToString());
break;
case TypeCode.String:
if (converter.CanConvertFrom(typeof(String)))
return converter.ConvertFrom((String)ret.Value);
else if (converter.CanConvertFrom(typeof(String)))
return converter.ConvertFromString(ret.Value.ToString());
break;
case TypeCode.DateTime:
if (converter.CanConvertFrom(typeof(DateTime)))
return converter.ConvertFrom((DateTime)ret.Value);
else if (converter.CanConvertFrom(typeof(String)))
return converter.ConvertFromString(ret.Value.ToString());
break;
case TypeCode.DBNull:
if (converter.CanConvertFrom(typeof(DBNull)))
return converter.ConvertFrom((DBNull)ret.Value);
else if (converter.CanConvertFrom(typeof(String)))
return converter.ConvertFromString(ret.Value.ToString());
break;
case TypeCode.Object:
if (converter.CanConvertFrom(typeof(Object)))
return converter.ConvertFrom((Object)ret.Value);
else if (converter.CanConvertFrom(typeof(String)))
return converter.ConvertFromString(ret.Value.ToString());
break;
}
}
// Unable to convert the value
return ret.Value;
}
private EvalResult EvaluateTypeMethod(EvalResult target, EvalResult[] args)
{
// Get all the static methods that might of interest to us
MethodInfo[] mis = ((Type)target.Value).GetMethods(BindingFlags.Static | BindingFlags.Public | BindingFlags.InvokeMethod);
return EvaluateMethod(mis, null, args);
}
private EvalResult EvaluateObjectInstance(EvalResult target,
EvalResult[] args,
object thisObject)
{
// Get the type definition of the target instance
Type t = target.Value.GetType();
// Get the list of all properties that might be of interest to us
PropertyInfo[] pis = t.GetProperties(BindingFlags.Instance | BindingFlags.Public | BindingFlags.GetProperty);
PropertyInfo callPi = null;
object[] callParams = null;
// Find properties that we could call
foreach (PropertyInfo pi in pis)
{
// Object indexers are compiled from 'this[...]' in C# to the fixed name 'Item'
if (pi.Name == "Item")
{
// Grab the list of parameters for this property accessor
ParameterInfo[] infos = pi.GetIndexParameters();
// Is the last parameter an array of params?
bool paramArray = (infos.Length > 0 ? infos[infos.Length - 1].IsDefined(typeof(ParamArrayAttribute), false) : false);
// It must have the same number of parameters as we have arguments
if (!paramArray && (infos.Length == args.Length))
{
// Match parameter types?
int i = 0;
int exact = 0;
object[] infoParams = new object[args.Length];
for (i = 0; i < infos.Length; i++)
{
TypeCode paramTc = Type.GetTypeCode(infos[i].ParameterType);
// Note how many parameters are an exact match
if (paramTc == args[i].Type)
{
infoParams[i] = args[i].Value;
exact++;
}
else
{
// If cannot be implicitly converted, then fail to match at all
if (ImplicitConverter.CanConvertTo(paramTc, args[i].Value, _language))
infoParams[i] = ImplicitConverter.ConvertTo(paramTc, args[i].Value, _language);
else
break;
}
}
// If all parameters exactly match
if (exact == infos.Length)
{
// Use this method
callPi = pi;
callParams = infoParams;
break;
}
// Remember the first compatible match we find
if ((i == infos.Length) && (callPi == null))
{
callPi = pi;
callParams = infoParams;
}
}
else if (paramArray)
{
// We can only handle packaging up a param array as an object array
int lastIndex = infos.Length - 1;
if (infos[lastIndex].ParameterType == typeof(object[]))
{
// Package up the extra parameters into an object array
object[] infoParams = new object[infos.Length];
object[] lastParams = new object[args.Length - lastIndex];
infoParams[lastIndex] = lastParams;
for (int j = 0; j < lastParams.Length; j++)
lastParams[j] = args[j + lastIndex].Value;
// Match parameter types for all but the last 'object[]' entry?
int i = 0;
int exact = 0;
for (i = 0; i < lastIndex; i++)
{
TypeCode paramTc = Type.GetTypeCode(infos[i].ParameterType);
// Note how many parameters are an exact match
if (paramTc == args[i].Type)
{
infoParams[i] = args[i].Value;
exact++;
}
else
{
// If cannot be implicitly converted, then fail to match at all
if (ImplicitConverter.CanConvertTo(paramTc, args[i].Value, _language))
infoParams[i] = ImplicitConverter.ConvertTo(paramTc, args[i].Value, _language);
else
break;
}
}
// If all parameters exactly match
if (exact == lastIndex)
{
// Use this method
callPi = pi;
callParams = infoParams;
break;
}
// Remember the first compatible match we find
if ((i == lastIndex) && (callPi == null))
{
callPi = pi;
callParams = infoParams;
}
}
}
}
}
if (callPi == null)
throw new ApplicationException("Cannot find array acessor for type '" + target.Type.ToString() + "' with matching number and type of arguments.");
// Call the static method and return result
EvalResult ret = new EvalResult();
ret.Value = callPi.GetValue(target.Value, callParams);
return DiscoverTypeCode(ret);
}
private EvalResult EvaluateObjectMethod(EvalResult target, EvalResult[] args)
{
// Get all the instance methods that might of interest to us
MethodInfo[] mis = target.Value.GetType().GetMethods(BindingFlags.Instance | BindingFlags.Public | BindingFlags.InvokeMethod);
return EvaluateMethod(mis, target.Value, args);
}
private EvalResult EvaluateMinus(EvalResult ret)
{
// Processing depends on the type we are provided with
switch (ret.Type)
{
case TypeCode.Byte:
ret.Value = 0 - ((Byte)ret.Value);
break;
case TypeCode.SByte:
ret.Value = 0 - ((SByte)ret.Value);
break;
case TypeCode.Char:
if (_language != Language.VBNet)
{
ret.Value = 0 - ((Char)ret.Value);
break;
}
else
throw new ApplicationException("Operation '-' cannot be applied to operand of type '" + ret.Type.ToString() + "'.");
case TypeCode.Int16:
ret.Value = 0 - ((Int16)ret.Value);
break;
case TypeCode.Int32:
ret.Value = 0 - ((Int32)ret.Value);
break;
case TypeCode.Int64:
ret.Value = 0 - ((Int64)ret.Value);
break;
case TypeCode.UInt16:
// Convert to long and subtract from zero
ret.Value = 0 - (Int64)((UInt16)ret.Value);
ret.Type = TypeCode.Int64;
break;
case TypeCode.UInt32:
// Convert to long and subtract from zero
ret.Value = 0 - (Int64)((UInt32)ret.Value);
ret.Type = TypeCode.Int64;
break;
case TypeCode.Single:
ret.Value = 0 - ((Single)ret.Value);
break;
case TypeCode.Double:
ret.Value = 0 - ((Double)ret.Value);
break;
case TypeCode.Decimal:
ret.Value = 0 - ((Decimal)ret.Value);
break;
default:
throw new ApplicationException("Operation '-' cannot be applied to operand of type '" + ret.Type.ToString() + "'.");
}
return ret;
}
/// <summary>
/// Evalaute this node and return result.
/// </summary>
/// <param name="thisObject">Reference to object that is exposed as 'this'.</param>
/// <returns>Result value and type of that result.</returns>
public override EvalResult Evaluate(object thisObject)
{
// Get the result from evaluating both children
EvalResult left = this[0].Evaluate(thisObject);
EvalResult right = this[1].Evaluate(thisObject);
int count;
if (_language == Language.CSharp)
{
// The shift count is always an Int32, so convert anything smaller to an Int32
switch (right.Type)
{
case TypeCode.Char:
count = (Int32)(Char)right.Value;
break;
case TypeCode.Byte:
count = (Int32)(Byte)right.Value;
break;
case TypeCode.SByte:
count = (Int32)(SByte)right.Value;
break;
case TypeCode.UInt16:
count = (Int32)(UInt16)right.Value;
break;
case TypeCode.Int16:
count = (Int32)(Int16)right.Value;
break;
case TypeCode.Int32:
count = (Int32)right.Value;
break;
default:
throw new ApplicationException("Shift operation '" + OperationString + "' cannot convert the shift count from type '" + right.Type.ToString() + "' to 'Int32'.");
}
}
else
{
if (ImplicitConverter.CanConvertToInt32(right.Value, Language.VBNet))
{
count = ImplicitConverter.ConvertToInt32(right.Value, Language.VBNet);
}
else
{
throw new ApplicationException("Shift operation '" + OperationString + "' cannot convert the shift count to a 'Int32' value.");
}
}
// Perform the actual shift operation
switch (left.Type)
{
case TypeCode.Byte:
return(EvalShiftOp((Int32)(Byte)left.Value, count));
case TypeCode.SByte:
return(EvalShiftOp((Int32)(SByte)left.Value, count));
case TypeCode.Char:
if (_language == Language.CSharp)
{
return(EvalShiftOp((Int32)(Char)left.Value, count));
}
break;
case TypeCode.UInt16:
return(EvalShiftOp((Int32)(UInt16)left.Value, count));
case TypeCode.Int16:
return(EvalShiftOp((Int32)(Int16)left.Value, count));
case TypeCode.Int32:
return(EvalShiftOp((Int32)(Int32)left.Value, count));
case TypeCode.UInt32:
return(EvalShiftOp((UInt32)left.Value, count));
case TypeCode.Int64:
return(EvalShiftOp((Int64)left.Value, count));
case TypeCode.UInt64:
return(EvalShiftOp((UInt64)left.Value, count));
case TypeCode.Boolean:
if (_language == Language.VBNet)
{
return(EvalShiftOp((Int16)ImplicitConverter.ConvertToInt16(left.Value, Language.VBNet), count));
}
break;
case TypeCode.Single:
if (_language == Language.VBNet)
{
return(EvalShiftOp((Int64)(Single)left.Value, count));
}
break;
case TypeCode.Double:
if (_language == Language.VBNet)
{
return(EvalShiftOp((Int64)(Double)left.Value, count));
}
break;
case TypeCode.Decimal:
if (_language == Language.VBNet)
{
return(EvalShiftOp((Int64)(Decimal)left.Value, count));
}
break;
}
throw new ApplicationException("Shift operation '" + OperationString + "' cannot shift type '" + left.Type.ToString() + "'.");
}
private EvalResult EvaluateObjectArray(EvalResult target,
EvalResult[] args,
object thisObject)
{
// We know the value is an actual array instance
Array array = (Array)target.Value;
// Must have same number of arguments as the array rank
if (array.Rank != args.Length)
throw new ApplicationException("Array expects '" + array.Rank.ToString() + "' indices but '" + args.Length.ToString() + "' have been specified.");
// Construct the set of indices for accessing array
long[] indices = new long[args.Length];
for (int i = 0; i < args.Length; i++)
indices[i] = ImplicitConverter.ConvertToInt64(args[i].Value, _language);
EvalResult ret = new EvalResult();
ret.Value = array.GetValue(indices);
return DiscoverTypeCode(ret);
}
private EvalResult EvaluatePlus(EvalResult ret)
{
// Unary plus means we do nothing as long as the type is valid
switch (ret.Type)
{
case TypeCode.Char:
if (_language == Language.VBNet)
throw new ApplicationException("Operation '+' cannot be applied to operand of type '" + ret.Type.ToString() + "'.");
else
break;
case TypeCode.Byte:
case TypeCode.SByte:
case TypeCode.Int16:
case TypeCode.Int32:
case TypeCode.Int64:
case TypeCode.UInt16:
case TypeCode.UInt32:
case TypeCode.UInt64:
case TypeCode.Single:
case TypeCode.Double:
case TypeCode.Decimal:
break;
default:
throw new ApplicationException("Operation '+' cannot be applied to operand of type '" + ret.Type.ToString() + "'.");
}
return ret;
}
private EvalResult EvaluateComplement(EvalResult ret)
{
// Unary plus means we do nothing as long as the type is valid
switch (ret.Type)
{
case TypeCode.Byte:
ret.Value = ~(Byte)ret.Value;
break;
case TypeCode.SByte:
ret.Value = ~(SByte)ret.Value;
break;
case TypeCode.Char:
if (_language != Language.VBNet)
ret.Value = ~(Char)ret.Value;
else
throw new ApplicationException("Operation '~' cannot be applied to operand of type '" + ret.Type.ToString() + "'.");
break;
case TypeCode.Int16:
ret.Value = ~(Int16)ret.Value;
break;
case TypeCode.Int32:
ret.Value = ~(Int32)ret.Value;
break;
case TypeCode.Int64:
ret.Value = ~(Int64)ret.Value;
break;
case TypeCode.UInt16:
ret.Value = ~(UInt16)ret.Value;
break;
case TypeCode.UInt32:
ret.Value = ~(UInt32)ret.Value;
break;
case TypeCode.UInt64:
ret.Value = ~(UInt64)ret.Value;
break;
default:
throw new ApplicationException("Operation '~' cannot be applied to operand of type '" + ret.Type.ToString() + "'.");
}
return ret;
}
private EvalResult EvaluateObjectInstance(EvalResult target,
EvalResult[] args,
object thisObject)
{
// Get the type definition of the target instance
Type t = target.Value.GetType();
// Get the list of all properties that might be of interest to us
PropertyInfo[] pis = t.GetProperties(BindingFlags.Instance | BindingFlags.Public | BindingFlags.GetProperty);
PropertyInfo callPi = null;
object[] callParams = null;
// Find properties that we could call
foreach (PropertyInfo pi in pis)
{
// Object indexers are compiled from 'this[...]' in C# to the fixed name 'Item'
if (pi.Name == "Item")
{
// Grab the list of parameters for this property accessor
ParameterInfo[] infos = pi.GetIndexParameters();
// Is the last parameter an array of params?
bool paramArray = (infos.Length > 0 ? infos[infos.Length - 1].IsDefined(typeof(ParamArrayAttribute), false) : false);
// It must have the same number of parameters as we have arguments
if (!paramArray && (infos.Length == args.Length))
{
// Match parameter types?
int i = 0;
int exact = 0;
object[] infoParams = new object[args.Length];
for (i = 0; i < infos.Length; i++)
{
TypeCode paramTc = Type.GetTypeCode(infos[i].ParameterType);
// Note how many parameters are an exact match
if (paramTc == args[i].Type)
{
infoParams[i] = args[i].Value;
exact++;
}
else
{
// If cannot be implicitly converted, then fail to match at all
if (ImplicitConverter.CanConvertTo(paramTc, args[i].Value, _language))
{
infoParams[i] = ImplicitConverter.ConvertTo(paramTc, args[i].Value, _language);
}
else
{
break;
}
}
}
// If all parameters exactly match
if (exact == infos.Length)
{
// Use this method
callPi = pi;
callParams = infoParams;
break;
}
// Remember the first compatible match we find
if ((i == infos.Length) && (callPi == null))
{
callPi = pi;
callParams = infoParams;
}
}
else if (paramArray)
{
// We can only handle packaging up a param array as an object array
int lastIndex = infos.Length - 1;
if (infos[lastIndex].ParameterType == typeof(object[]))
{
// Package up the extra parameters into an object array
object[] infoParams = new object[infos.Length];
object[] lastParams = new object[args.Length - lastIndex];
infoParams[lastIndex] = lastParams;
for (int j = 0; j < lastParams.Length; j++)
{
lastParams[j] = args[j + lastIndex].Value;
}
// Match parameter types for all but the last 'object[]' entry?
int i = 0;
int exact = 0;
for (i = 0; i < lastIndex; i++)
{
TypeCode paramTc = Type.GetTypeCode(infos[i].ParameterType);
// Note how many parameters are an exact match
if (paramTc == args[i].Type)
{
infoParams[i] = args[i].Value;
exact++;
}
else
{
// If cannot be implicitly converted, then fail to match at all
if (ImplicitConverter.CanConvertTo(paramTc, args[i].Value, _language))
{
infoParams[i] = ImplicitConverter.ConvertTo(paramTc, args[i].Value, _language);
}
else
{
break;
}
}
}
// If all parameters exactly match
if (exact == lastIndex)
{
// Use this method
callPi = pi;
callParams = infoParams;
break;
}
// Remember the first compatible match we find
if ((i == lastIndex) && (callPi == null))
{
callPi = pi;
callParams = infoParams;
}
}
}
}
}
if (callPi == null)
{
throw new ApplicationException("Cannot find array acessor for type '" + target.Type.ToString() + "' with matching number and type of arguments.");
}
// Call the static method and return result
EvalResult ret = new EvalResult();
ret.Value = callPi.GetValue(target.Value, callParams);
return(DiscoverTypeCode(ret));
}
/// <summary>
/// Evalaute this node and return result.
/// </summary>
/// <param name="thisObject">Reference to object that is exposed as 'this'.</param>
/// <returns>Result value and type of that result.</returns>
public override EvalResult Evaluate(object thisObject)
{
// Always evaluate the first child
EvalResult left = this[0].Evaluate(thisObject);
// We can only handle a boolean result
if (left.Type != TypeCode.Boolean)
{
// Try and perform implicit conversion to a boolean
if (ImplicitConverter.CanConvertToBoolean(left.Value, _language))
{
left.Type = TypeCode.Boolean;
left.Value = ImplicitConverter.ConvertToBoolean(left.Value, _language);
}
else
{
throw new ApplicationException("Operator '" + OperationString + "' can only operate on 'bool' types.");
}
}
switch (Operation)
{
case CompareOp.Or:
// If 'true' then there is no need to evaluate the right side
if ((bool)left.Value)
{
return(left);
}
break;
case CompareOp.And:
// If 'false' then there is no need to evaluate the right side
if (!(bool)left.Value)
{
return(left);
}
break;
default:
throw new ApplicationException("Unimplemented conditional logical operator '" + Operation.ToString() + "'.");
}
// Need to evaluate the second child
left = this[1].Evaluate(thisObject);
// We can only handle a boolean result
if (left.Type != TypeCode.Boolean)
{
// Try and perform implicit conversion to a boolean
if (ImplicitConverter.CanConvertToBoolean(left.Value, _language))
{
left.Type = TypeCode.Boolean;
left.Value = ImplicitConverter.ConvertToBoolean(left.Value, _language);
}
else
{
throw new ApplicationException("Operator '" + OperationString + "' can only operate on 'bool' types.");
}
}
// Just return whatever the result is as the result of the conditional operation
return(left);
}
private EvalResult EvaluateMethod(MethodInfo[] mis, object target, EvalResult[] args)
{
if (mis == null)
{
if (target == null)
throw new ApplicationException("Cannot find static public method called '" + Identifier + "'.");
else
throw new ApplicationException("Cannot find instance public method called '" + Identifier + "'.");
}
MethodInfo callMi = null;
object[] callParams = null;
// Find methods that we could call
foreach (MethodInfo mi in mis)
{
// Matching name?
if (mi.Name == Identifier)
{
ParameterInfo[] pis = mi.GetParameters();
// Is the last parameter an array of params?
bool paramArray = (pis.Length > 0 ? pis[pis.Length - 1].IsDefined(typeof(ParamArrayAttribute), false) : false);
// It must have the same number of parameters as we have arguments
if (!paramArray && (pis.Length == args.Length))
{
// Match parameter types?
int i = 0;
int exact = 0;
object[] pisParams = new object[args.Length];
for (i = 0; i < pis.Length; i++)
{
TypeCode methodTc = Type.GetTypeCode(pis[i].ParameterType);
// Note how many parameters are an exact match
if (methodTc == args[i].Type)
{
pisParams[i] = args[i].Value;
exact++;
}
else
{
// If cannot be implicitly converted, then fail to match at all
if (ImplicitConverter.CanConvertTo(methodTc, args[i].Value, _language))
pisParams[i] = ImplicitConverter.ConvertTo(methodTc, args[i].Value, _language);
else
break;
}
}
// If all parameters exactly match
if (exact == pis.Length)
{
// Use this method
callMi = mi;
callParams = pisParams;
break;
}
// Remember the first compatible match we find
if ((i == pis.Length) && (callMi == null))
{
callMi = mi;
callParams = pisParams;
}
}
else if (paramArray)
{
// We can only handle packaging up a param array as an object array
int lastIndex = pis.Length - 1;
if (pis[lastIndex].ParameterType == typeof(object[]))
{
// Package up the extra parameters into an object array
object[] pisParams = new object[pis.Length];
object[] lastParams = new object[args.Length - lastIndex];
pisParams[lastIndex] = lastParams;
for (int j = 0; j < lastParams.Length; j++)
lastParams[j] = args[j + lastIndex].Value;
// Match parameter types for all but the last 'object[]' entry?
int i = 0;
int exact = 0;
for (i = 0; i < lastIndex; i++)
{
TypeCode methodTc = Type.GetTypeCode(pis[i].ParameterType);
// Note how many parameters are an exact match
if (methodTc == args[i].Type)
{
pisParams[i] = args[i].Value;
exact++;
}
else
{
// If cannot be implicitly converted, then fail to match at all
if (ImplicitConverter.CanConvertTo(methodTc, args[i].Value, _language))
pisParams[i] = ImplicitConverter.ConvertTo(methodTc, args[i].Value, _language);
else
break;
}
}
// If all parameters exactly match
if (exact == lastIndex)
{
// Use this method
callMi = mi;
callParams = pisParams;
break;
}
// Remember the first compatible match we find
if ((i == lastIndex) && (callMi == null))
{
callMi = mi;
callParams = pisParams;
}
}
}
}
}
if (callMi == null)
{
if (target == null)
throw new ApplicationException("Cannot find static public method called '" + Identifier + "' with matching parameters to those provided.");
else
throw new ApplicationException("Cannot find instance public method called '" + Identifier + "' with matching parameters to those provided.");
}
// Call the static method and return result
EvalResult ret = new EvalResult();
ret.Value = callMi.Invoke(target, callParams);
return DiscoverTypeCode(ret);
}
private object ConvertUsingConverter(EvalResult ret, Type targetType)
{
// Try and get a converter from the target type
TypeConverter converter = TypeDescriptor.GetConverter(targetType);
if (converter != null)
{
// Ask the converter to convert using the source type when possible, if not possible
// fallback to requesting a string version of the source be converted to the target
switch (ret.Type)
{
case TypeCode.Boolean:
if (converter.CanConvertFrom(typeof(Boolean)))
{
return(converter.ConvertFrom((Boolean)ret.Value));
}
else if (converter.CanConvertFrom(typeof(String)))
{
return(converter.ConvertFromString(ret.Value.ToString()));
}
break;
case TypeCode.SByte:
if (converter.CanConvertFrom(typeof(SByte)))
{
return(converter.ConvertFrom((SByte)ret.Value));
}
else if (converter.CanConvertFrom(typeof(String)))
{
return(converter.ConvertFromString(ret.Value.ToString()));
}
break;
case TypeCode.Byte:
if (converter.CanConvertFrom(typeof(Byte)))
{
return(converter.ConvertFrom((Byte)ret.Value));
}
else if (converter.CanConvertFrom(typeof(String)))
{
return(converter.ConvertFromString(ret.Value.ToString()));
}
break;
case TypeCode.Char:
if (converter.CanConvertFrom(typeof(Char)))
{
return(converter.ConvertFrom((Char)ret.Value));
}
else if (converter.CanConvertFrom(typeof(String)))
{
return(converter.ConvertFromString(ret.Value.ToString()));
}
break;
case TypeCode.Int16:
if (converter.CanConvertFrom(typeof(Int16)))
{
return(converter.ConvertFrom((Int16)ret.Value));
}
else if (converter.CanConvertFrom(typeof(String)))
{
return(converter.ConvertFromString(ret.Value.ToString()));
}
break;
case TypeCode.Int32:
if (converter.CanConvertFrom(typeof(Int32)))
{
return(converter.ConvertFrom((Int32)ret.Value));
}
else if (converter.CanConvertFrom(typeof(String)))
{
return(converter.ConvertFromString(ret.Value.ToString()));
}
break;
case TypeCode.Int64:
if (converter.CanConvertFrom(typeof(Int64)))
{
return(converter.ConvertFrom((Int64)ret.Value));
}
else if (converter.CanConvertFrom(typeof(String)))
{
return(converter.ConvertFromString(ret.Value.ToString()));
}
break;
case TypeCode.UInt16:
if (converter.CanConvertFrom(typeof(UInt16)))
{
return(converter.ConvertFrom((UInt16)ret.Value));
}
else if (converter.CanConvertFrom(typeof(String)))
{
return(converter.ConvertFromString(ret.Value.ToString()));
}
break;
case TypeCode.UInt32:
if (converter.CanConvertFrom(typeof(UInt32)))
{
return(converter.ConvertFrom((UInt32)ret.Value));
}
else if (converter.CanConvertFrom(typeof(String)))
{
return(converter.ConvertFromString(ret.Value.ToString()));
}
break;
case TypeCode.UInt64:
if (converter.CanConvertFrom(typeof(UInt64)))
{
return(converter.ConvertFrom((UInt64)ret.Value));
}
else if (converter.CanConvertFrom(typeof(String)))
{
return(converter.ConvertFromString(ret.Value.ToString()));
}
break;
case TypeCode.Single:
if (converter.CanConvertFrom(typeof(Single)))
{
return(converter.ConvertFrom((Single)ret.Value));
}
else if (converter.CanConvertFrom(typeof(String)))
{
return(converter.ConvertFromString(ret.Value.ToString()));
}
break;
case TypeCode.Double:
if (converter.CanConvertFrom(typeof(Double)))
{
return(converter.ConvertFrom((Double)ret.Value));
}
else if (converter.CanConvertFrom(typeof(String)))
{
return(converter.ConvertFromString(ret.Value.ToString()));
}
break;
case TypeCode.Decimal:
if (converter.CanConvertFrom(typeof(Decimal)))
{
return(converter.ConvertFrom((Decimal)ret.Value));
}
else if (converter.CanConvertFrom(typeof(String)))
{
return(converter.ConvertFromString(ret.Value.ToString()));
}
break;
case TypeCode.String:
if (converter.CanConvertFrom(typeof(String)))
{
return(converter.ConvertFrom((String)ret.Value));
}
else if (converter.CanConvertFrom(typeof(String)))
{
return(converter.ConvertFromString(ret.Value.ToString()));
}
break;
case TypeCode.DateTime:
if (converter.CanConvertFrom(typeof(DateTime)))
{
return(converter.ConvertFrom((DateTime)ret.Value));
}
else if (converter.CanConvertFrom(typeof(String)))
{
return(converter.ConvertFromString(ret.Value.ToString()));
}
break;
case TypeCode.DBNull:
if (converter.CanConvertFrom(typeof(DBNull)))
{
return(converter.ConvertFrom((DBNull)ret.Value));
}
else if (converter.CanConvertFrom(typeof(String)))
{
return(converter.ConvertFromString(ret.Value.ToString()));
}
break;
case TypeCode.Object:
if (converter.CanConvertFrom(typeof(Object)))
{
return(converter.ConvertFrom((Object)ret.Value));
}
else if (converter.CanConvertFrom(typeof(String)))
{
return(converter.ConvertFromString(ret.Value.ToString()));
}
break;
}
}
// Unable to convert the value
return(ret.Value);
}
private EvalResult EvaluateNot(EvalResult ret)
{
// Unary plus means we do nothing as long as the type is valid
switch (ret.Type)
{
case TypeCode.Boolean:
ret.Value = !(bool)ret.Value;
break;
default:
throw new ApplicationException("Logical invert cannot be applied to operand of type '" + ret.Type.ToString() + "'.");
}
return ret;
}
