protected void AddImplementation(string op, Type baseType, BinaryOperatorMethod baseMethod, TypeConverter resultConverter)
{
var key = OperatorDispatchKey.CreateFromTypes(op, baseType, baseType);
var imp = new OperatorImplementation(key, baseType, baseMethod, null, null, resultConverter);
_baseOperatorImplementations.Add(key, imp);
}
protected OperatorImplementation AddUnary(ExpressionType op, Type commonType, UnaryOperatorMethod unaryMethod)
{
var key = new OperatorDispatchKey(op, commonType);
var impl = new OperatorImplementation(key, commonType, null, unaryMethod, null, null);
OperatorImplementations[key] = impl;
return(impl);
}
protected OperatorImplementation AddConverter(Type fromType, Type toType, UnaryOperatorMethod method)
{
var key = new OperatorDispatchKey(ExpressionType.ConvertChecked, fromType, toType);
var impl = new OperatorImplementation(key, toType, method);
OperatorImplementations[key] = impl;
return(impl);
}
protected OperatorImplementation AddBinary(ExpressionType op, Type commonType,
BinaryOperatorMethod binaryMethod, UnaryOperatorMethod resultConverter)
{
var key = new OperatorDispatchKey(op, commonType, commonType);
var impl = new OperatorImplementation(key, commonType, binaryMethod, null, null, resultConverter);
OperatorImplementations[key] = impl;
return(impl);
}
protected virtual OperatorImplementation CreateBinaryOperatorImplementation(ExpressionType op, Type arg1Type, Type arg2Type,
Type commonType, BinaryOperatorMethod method, UnaryOperatorMethod resultConverter)
{
var key = new OperatorDispatchKey(op, arg1Type, arg2Type);
var arg1Converter = arg1Type == commonType ? null : GetConverter(arg1Type, commonType);
var arg2Converter = arg2Type == commonType ? null : GetConverter(arg2Type, commonType);
var impl = new OperatorImplementation(key, commonType, method, arg1Converter, arg2Converter, resultConverter);
return(impl);
}
public object ExecuteUnaryOperator(ExpressionType op, object arg1, ref OperatorImplementation previousUsed)
{
// 1. Get arg type
Type arg1Type;
try {
arg1Type = arg1.GetType();
} catch (NullReferenceException) {
CheckUnassigned(arg1);
throw;
}
// 2. If we had prev impl, check if current args types match it; first copy it into local variable
OperatorDispatchKey key;
var currentImpl = previousUsed;
if (currentImpl != null && arg1Type != currentImpl.Key.Arg1Type)
{
currentImpl = null;
}
// 3. Find implementation for arg type
if (currentImpl == null)
{
key = new OperatorDispatchKey(op, arg1Type);
if (!OperatorImplementations.TryGetValue(key, out currentImpl))
{
ThrowError(Resources.ErrOpNotDefinedForType, op, arg1Type);
}
}
// 4. Actually call
try {
previousUsed = currentImpl; //set previousUsed so next time we'll try this impl first
return(currentImpl.Arg1Converter(arg1));
} catch (OverflowException) {
if (currentImpl.OverflowHandler == null)
{
throw;
}
previousUsed = currentImpl.OverflowHandler; //set previousUsed to overflowHandler, so it will be used next time
return(ExecuteUnaryOperator(op, arg1, ref previousUsed)); //call self recursively
}
}
private static bool CanOverflow(OperatorImplementation impl)
{
if (!CanOverflow(impl.Key.Op))
{
return(false);
}
if (impl.CommonType == typeof(int) && IsSmallInt(impl.Key.Arg1Type) && IsSmallInt(impl.Key.Arg2Type))
{
return(false);
}
if (impl.CommonType == typeof(double) || impl.CommonType == typeof(float))
{
return(false);
}
if (impl.CommonType == typeof(BigInteger))
{
return(false);
}
return(true);
}
/*
* public virtual FunctionBindingInfo GetFunctionBindingInfo(string name, AstNodeList parameters) {
* return FunctionBindings.Find(name, parameters.Count);
* }
* //Utility methods for adding library functions
* public FunctionBindingInfo AddFunction(string name, int paramCount) {
* return null;
* }
* public FunctionBindingInfo AddFunction(string name, int paramCount, FunctionFlags flags) {
* FunctionBindingInfo info = new FunctionBindingInfo(name, paramCount, null, flags);
* FunctionBindings.Add(name, info);
* return info;
* }
*/
#region Operator implementations
// When an implementation for exact type pair is not found, we find implementation for base type and create
// implementation for exact types using type converters
public virtual OperatorImplementation AddOperatorImplementation(OperatorImplementationTable implementations, OperatorDispatchKey forKey)
{
Type baseType = GetBaseTypeForExpression(forKey.OpSymbol, forKey.Arg1Type, forKey.Arg2Type);
if (baseType == null)
{
return(null);
}
TypeConverter arg1Converter = GetConverter(forKey.Arg1Type, baseType);
TypeConverter arg2Converter = GetConverter(forKey.Arg2Type, baseType);
//Get base method for the operator and common type
var baseKey = OperatorDispatchKey.CreateFromTypes(forKey.OpSymbol, baseType, baseType);
OperatorImplementation baseImpl;
if (!_baseOperatorImplementations.TryGetValue(baseKey, out baseImpl))
{
throw new Exception(string.Format(Resources.ErrOpNotDefinedForTypes, forKey.OpSymbol, forKey.Arg1Type, forKey.Arg2Type));
}
var impl = new OperatorImplementation(forKey, baseType, baseImpl.BaseMethod, arg1Converter, arg2Converter, baseImpl.ResultConverter);
implementations[forKey] = impl;
return(impl);
}
public virtual bool HandleException(Exception ex, DynamicCallDispatcher dispatcher, OperatorImplementation failedTarget, EvaluationContext context)
{
return(false);
}
public object ExecuteBinaryOperator(ExpressionType op, object arg1, object arg2, ref OperatorImplementation previousUsed)
{
// 1. Get arg types
Type arg1Type, arg2Type;
try {
arg1Type = arg1.GetType();
arg2Type = arg2.GetType();
} catch (NullReferenceException) {
// arg1 or arg2 is null - which means never assigned.
CheckUnassigned(arg1);
CheckUnassigned(arg2);
throw;
}
// 2. If we had prev impl, check if current args types match it; first copy it into local variable
// Note: BinaryExpression node might already have tried it directly, without any checks, and
// apparently failed. At some point this attempt in BinaryExpressionNode can become disabled.
// But we might still try it here, with proper checks
var currentImpl = previousUsed;
if (currentImpl != null && (arg1Type != currentImpl.Key.Arg1Type || arg2Type != currentImpl.Key.Arg2Type))
{
currentImpl = null;
}
// 3. Find implementation for arg types
OperatorDispatchKey key;
if (currentImpl == null)
{
key = new OperatorDispatchKey(op, arg1Type, arg2Type);
if (!OperatorImplementations.TryGetValue(key, out currentImpl))
{
ThrowScriptError(Resources.ErrOpNotDefinedForTypes, op, arg1Type, arg2Type);
}
}
// 4. Actually call
try {
previousUsed = currentImpl;
return(currentImpl.EvaluateBinary(arg1, arg2));
} catch (OverflowException) {
if (currentImpl.OverflowHandler == null)
{
throw;
}
previousUsed = currentImpl.OverflowHandler; //set previousUsed to overflowHandler, so it will be used next time
return(ExecuteBinaryOperator(op, arg1, arg2, ref previousUsed)); //call self recursively
} catch (IndexOutOfRangeException) {
//We can get here only if we use SmartBoxing - the result is out of range of pre-allocated boxes,
// so attempt to lookup a boxed value in _boxes dictionary fails with outOfRange exc
if (currentImpl.NoBoxImplementation == null)
{
throw;
}
// If NoBoxImpl is not null, then it is implementation with auto-boxing.
// Auto-boxing failed - the result is outside the range of our boxes array. Let's call no-box version.
// we also set previousUsed to no-box implementation, so we use it in the future calls
previousUsed = currentImpl.NoBoxImplementation;
return(ExecuteBinaryOperator(op, arg1, arg2, ref previousUsed)); //call self recursively
}
}//method