public void RegisterFunction(string functionName, Delegate function, bool isOverWritable)
{
if (string.IsNullOrEmpty(functionName))
throw new ArgumentNullException("functionName");
if (function == null)
throw new ArgumentNullException("function");
Type funcType = function.GetType();
if (!funcType.FullName.StartsWith("System.Func"))
throw new ArgumentException("Only System.Func delegates are permitted.", "function");
#if NETFX_CORE
foreach (Type genericArgument in funcType.GenericTypeArguments)
#else
foreach (Type genericArgument in funcType.GetGenericArguments())
#endif
if (genericArgument != typeof(double))
throw new ArgumentException("Only doubles are supported as function arguments", "function");
functionName = ConvertFunctionName(functionName);
if (functions.ContainsKey(functionName) && !functions[functionName].IsOverWritable)
{
string message = string.Format("The function \"{0}\" cannot be overwriten.", functionName);
throw new Exception(message);
}
#if NETFX_CORE
int numberOfParameters = function.GetMethodInfo().GetParameters().Length;
#else
int numberOfParameters = function.Method.GetParameters().Length;
#endif
if (functions.ContainsKey(functionName) && functions[functionName].NumberOfParameters != numberOfParameters)
{
string message = string.Format("The number of parameters cannot be changed when overwriting a method.");
throw new Exception(message);
}
FunctionInfo functionInfo = new FunctionInfo(functionName, numberOfParameters, isOverWritable, function);
if (functions.ContainsKey(functionName))
functions[functionName] = functionInfo;
else
functions.Add(functionName, functionInfo);
}
private Expression GenerateMethodBody(Operation operation, ParameterExpression contextParameter,
IFunctionRegistry functionRegistry, IDictionary <string, double> variables)
{
if (operation == null)
{
throw new ArgumentNullException("operation");
}
if (operation.GetType() == typeof(IntegerConstant))
{
IntegerConstant constant = (IntegerConstant)operation;
double value = constant.Value;
return(Expression.Constant(value, typeof(double)));
}
else if (operation.GetType() == typeof(FloatingPointConstant))
{
FloatingPointConstant constant = (FloatingPointConstant)operation;
return(Expression.Constant(constant.Value, typeof(double)));
}
else if (operation.GetType() == typeof(Variable))
{
Variable variable = (Variable)operation;
Func <string, FormulaContext, double> getVariableValueOrThrow = PrecompiledMethods.GetVariableValueOrThrow;
return(Expression.Call(null,
getVariableValueOrThrow.Method,
Expression.Constant(variable.Name),
contextParameter));
}
else if (operation.GetType() == typeof(Multiplication))
{
Multiplication multiplication = (Multiplication)operation;
Expression argument1 = GenerateMethodBody(multiplication.Argument1, contextParameter, functionRegistry, variables);
Expression argument2 = GenerateMethodBody(multiplication.Argument2, contextParameter, functionRegistry, variables);
return(Expression.Multiply(argument1, argument2));
}
else if (operation.GetType() == typeof(Addition))
{
Addition addition = (Addition)operation;
Expression argument1 = GenerateMethodBody(addition.Argument1, contextParameter, functionRegistry, variables);
Expression argument2 = GenerateMethodBody(addition.Argument2, contextParameter, functionRegistry, variables);
return(Expression.Add(argument1, argument2));
}
else if (operation.GetType() == typeof(Subtraction))
{
Subtraction addition = (Subtraction)operation;
Expression argument1 = GenerateMethodBody(addition.Argument1, contextParameter, functionRegistry, variables);
Expression argument2 = GenerateMethodBody(addition.Argument2, contextParameter, functionRegistry, variables);
return(Expression.Subtract(argument1, argument2));
}
else if (operation.GetType() == typeof(Division))
{
Division division = (Division)operation;
Expression dividend = GenerateMethodBody(division.Dividend, contextParameter, functionRegistry, variables);
Expression divisor = GenerateMethodBody(division.Divisor, contextParameter, functionRegistry, variables);
return(Expression.Divide(dividend, divisor));
}
else if (operation.GetType() == typeof(Modulo))
{
Modulo modulo = (Modulo)operation;
Expression dividend = GenerateMethodBody(modulo.Dividend, contextParameter, functionRegistry, variables);
Expression divisor = GenerateMethodBody(modulo.Divisor, contextParameter, functionRegistry, variables);
return(Expression.Modulo(dividend, divisor));
}
else if (operation.GetType() == typeof(Exponentiation))
{
Exponentiation exponentation = (Exponentiation)operation;
Expression @base = GenerateMethodBody(exponentation.Base, contextParameter, functionRegistry, variables);
Expression exponent = GenerateMethodBody(exponentation.Exponent, contextParameter, functionRegistry, variables);
return(Expression.Call(null, typeof(Math).GetMethod("Pow", new Type[] { typeof(double), typeof(double) }), @base, exponent));
}
else if (operation.GetType() == typeof(UnaryMinus))
{
UnaryMinus unaryMinus = (UnaryMinus)operation;
Expression argument = GenerateMethodBody(unaryMinus.Argument, contextParameter, functionRegistry, variables);
return(Expression.Negate(argument));
}
else if (operation.GetType() == typeof(And))
{
And and = (And)operation;
Expression argument1 = Expression.NotEqual(GenerateMethodBody(and.Argument1, contextParameter, functionRegistry, variables), Expression.Constant(0.0));
Expression argument2 = Expression.NotEqual(GenerateMethodBody(and.Argument2, contextParameter, functionRegistry, variables), Expression.Constant(0.0));
return(Expression.Condition(Expression.And(argument1, argument2),
Expression.Constant(1.0),
Expression.Constant(0.0)));
}
else if (operation.GetType() == typeof(Or))
{
Or and = (Or)operation;
Expression argument1 = Expression.NotEqual(GenerateMethodBody(and.Argument1, contextParameter, functionRegistry, variables), Expression.Constant(0.0));
Expression argument2 = Expression.NotEqual(GenerateMethodBody(and.Argument2, contextParameter, functionRegistry, variables), Expression.Constant(0.0));
return(Expression.Condition(Expression.Or(argument1, argument2),
Expression.Constant(1.0),
Expression.Constant(0.0)));
}
else if (operation.GetType() == typeof(LessThan))
{
LessThan lessThan = (LessThan)operation;
Expression argument1 = GenerateMethodBody(lessThan.Argument1, contextParameter, functionRegistry, variables);
Expression argument2 = GenerateMethodBody(lessThan.Argument2, contextParameter, functionRegistry, variables);
return(Expression.Condition(Expression.LessThan(argument1, argument2),
Expression.Constant(1.0),
Expression.Constant(0.0)));
}
else if (operation.GetType() == typeof(LessOrEqualThan))
{
LessOrEqualThan lessOrEqualThan = (LessOrEqualThan)operation;
Expression argument1 = GenerateMethodBody(lessOrEqualThan.Argument1, contextParameter, functionRegistry, variables);
Expression argument2 = GenerateMethodBody(lessOrEqualThan.Argument2, contextParameter, functionRegistry, variables);
return(Expression.Condition(Expression.LessThanOrEqual(argument1, argument2),
Expression.Constant(1.0),
Expression.Constant(0.0)));
}
else if (operation.GetType() == typeof(GreaterThan))
{
GreaterThan greaterThan = (GreaterThan)operation;
Expression argument1 = GenerateMethodBody(greaterThan.Argument1, contextParameter, functionRegistry, variables);
Expression argument2 = GenerateMethodBody(greaterThan.Argument2, contextParameter, functionRegistry, variables);
return(Expression.Condition(Expression.GreaterThan(argument1, argument2),
Expression.Constant(1.0),
Expression.Constant(0.0)));
}
else if (operation.GetType() == typeof(GreaterOrEqualThan))
{
GreaterOrEqualThan greaterOrEqualThan = (GreaterOrEqualThan)operation;
Expression argument1 = GenerateMethodBody(greaterOrEqualThan.Argument1, contextParameter, functionRegistry, variables);
Expression argument2 = GenerateMethodBody(greaterOrEqualThan.Argument2, contextParameter, functionRegistry, variables);
return(Expression.Condition(Expression.GreaterThanOrEqual(argument1, argument2),
Expression.Constant(1.0),
Expression.Constant(0.0)));
}
else if (operation.GetType() == typeof(Equal))
{
Equal equal = (Equal)operation;
Expression argument1 = GenerateMethodBody(equal.Argument1, contextParameter, functionRegistry, variables);
Expression argument2 = GenerateMethodBody(equal.Argument2, contextParameter, functionRegistry, variables);
return(Expression.Condition(Expression.Equal(argument1, argument2),
Expression.Constant(1.0),
Expression.Constant(0.0)));
}
else if (operation.GetType() == typeof(NotEqual))
{
NotEqual notEqual = (NotEqual)operation;
Expression argument1 = GenerateMethodBody(notEqual.Argument1, contextParameter, functionRegistry, variables);
Expression argument2 = GenerateMethodBody(notEqual.Argument2, contextParameter, functionRegistry, variables);
return(Expression.Condition(Expression.NotEqual(argument1, argument2),
Expression.Constant(1.0),
Expression.Constant(0.0)));
}
else if (operation.GetType() == typeof(Function))
{
Function function = (Function)operation;
FunctionInfo functionInfo = functionRegistry.GetFunctionInfo(function.FunctionName);
Type funcType;
Type[] parameterTypes;
Expression[] arguments;
if (function.FunctionName == "isvardefined")
{
if (function.Arguments.Count != 1)
{
throw new ArgumentException("Invalid number of arguments.");
}
if (function.Arguments[0].GetType() == typeof(Variable))
{
Variable variable = (Variable)function.Arguments[0];
double value;
bool variableFound = variables.TryGetValue(variable.Name, out value);
IntegerConstant newArgument = new IntegerConstant(variableFound ? 1 : 0);
function.Arguments[0] = newArgument;
}
else if (function.Arguments[0].GetType() == typeof(IntegerConstant))
{
IntegerConstant oldArgument = (IntegerConstant)function.Arguments[0];
IntegerConstant newArgument = new IntegerConstant(oldArgument.Value != 0 ? 1 : 0);
function.Arguments[0] = newArgument;
}
else if (function.Arguments[0].GetType() == typeof(FloatingPointConstant))
{
FloatingPointConstant oldArgument = (FloatingPointConstant)function.Arguments[0];
FloatingPointConstant newArgument = new FloatingPointConstant(oldArgument.Value != 0 ? 1 : 0);
function.Arguments[0] = newArgument;
}
else
{
throw new ArgumentException("Invalid argument for isVarDefined.");
}
}
if (functionInfo.IsDynamicFunc)
{
funcType = typeof(DynamicFunc <double, double>);
parameterTypes = new Type[] { typeof(double[]) };
Expression[] arrayArguments = new Expression[function.Arguments.Count];
for (int i = 0; i < function.Arguments.Count; i++)
{
arrayArguments[i] = GenerateMethodBody(function.Arguments[i], contextParameter, functionRegistry, variables);
}
arguments = new Expression[1];
arguments[0] = NewArrayExpression.NewArrayInit(typeof(double), arrayArguments);
}
else
{
funcType = GetFuncType(functionInfo.NumberOfParameters);
parameterTypes = (from i in Enumerable.Range(0, functionInfo.NumberOfParameters)
select typeof(double)).ToArray();
arguments = new Expression[functionInfo.NumberOfParameters];
for (int i = 0; i < functionInfo.NumberOfParameters; i++)
{
arguments[i] = GenerateMethodBody(function.Arguments[i], contextParameter, functionRegistry, variables);
}
}
Expression getFunctionRegistry = Expression.Property(contextParameter, "FunctionRegistry");
ParameterExpression functionInfoVariable = Expression.Variable(typeof(FunctionInfo));
Expression funcInstance;
if (!functionInfo.IsOverWritable)
{
funcInstance = Expression.Convert(
Expression.Property(
Expression.Call(
getFunctionRegistry,
typeof(IFunctionRegistry).GetMethod("GetFunctionInfo", new Type[] { typeof(string) }),
Expression.Constant(function.FunctionName)),
"Function"),
funcType);
}
else
{
funcInstance = Expression.Constant(functionInfo.Function, funcType);
}
return(Expression.Call(
funcInstance,
funcType.GetMethod("Invoke", parameterTypes),
arguments));
}
else
{
throw new ArgumentException(string.Format("Unsupported operation \"{0}\".", operation.GetType().FullName), "operation");
}
}
public double Execute(Operation operation,
IFunctionRegistry functionRegistry,
IConstantRegistry constantRegistry,
IDictionary <string, double> variables)
{
if (operation == null)
{
throw new ArgumentNullException("operation");
}
if (operation.GetType() == typeof(IntegerConstant))
{
IntegerConstant constant = (IntegerConstant)operation;
return(constant.Value);
}
else if (operation.GetType() == typeof(FloatingPointConstant))
{
FloatingPointConstant constant = (FloatingPointConstant)operation;
return(constant.Value);
}
else if (operation.GetType() == typeof(Variable))
{
Variable variable = (Variable)operation;
double value;
bool variableFound = variables.TryGetValue(variable.Name, out value);
if (variableFound)
{
return(value);
}
else
{
throw new VariableNotDefinedException(string.Format("The variable \"{0}\" used is not defined.", variable.Name));
}
}
else if (operation.GetType() == typeof(Multiplication))
{
Multiplication multiplication = (Multiplication)operation;
return(Execute(multiplication.Argument1, functionRegistry, constantRegistry, variables) * Execute(multiplication.Argument2, functionRegistry, constantRegistry, variables));
}
else if (operation.GetType() == typeof(Addition))
{
Addition addition = (Addition)operation;
return(Execute(addition.Argument1, functionRegistry, constantRegistry, variables) + Execute(addition.Argument2, functionRegistry, constantRegistry, variables));
}
else if (operation.GetType() == typeof(Subtraction))
{
Subtraction addition = (Subtraction)operation;
return(Execute(addition.Argument1, functionRegistry, constantRegistry, variables) - Execute(addition.Argument2, functionRegistry, constantRegistry, variables));
}
else if (operation.GetType() == typeof(Division))
{
Division division = (Division)operation;
return(Execute(division.Dividend, functionRegistry, constantRegistry, variables) / Execute(division.Divisor, functionRegistry, constantRegistry, variables));
}
else if (operation.GetType() == typeof(Modulo))
{
Modulo division = (Modulo)operation;
return(Execute(division.Dividend, functionRegistry, constantRegistry, variables) % Execute(division.Divisor, functionRegistry, constantRegistry, variables));
}
else if (operation.GetType() == typeof(Exponentiation))
{
Exponentiation exponentiation = (Exponentiation)operation;
return(Math.Pow(Execute(exponentiation.Base, functionRegistry, constantRegistry, variables), Execute(exponentiation.Exponent, functionRegistry, constantRegistry, variables)));
}
else if (operation.GetType() == typeof(UnaryMinus))
{
UnaryMinus unaryMinus = (UnaryMinus)operation;
return(-Execute(unaryMinus.Argument, functionRegistry, constantRegistry, variables));
}
else if (operation.GetType() == typeof(And))
{
And and = (And)operation;
var operation1 = Execute(and.Argument1, functionRegistry, constantRegistry, variables) != 0;
var operation2 = Execute(and.Argument2, functionRegistry, constantRegistry, variables) != 0;
return((operation1 && operation2) ? 1.0 : 0.0);
}
else if (operation.GetType() == typeof(Or))
{
Or or = (Or)operation;
var operation1 = Execute(or.Argument1, functionRegistry, constantRegistry, variables) != 0;
var operation2 = Execute(or.Argument2, functionRegistry, constantRegistry, variables) != 0;
return((operation1 || operation2) ? 1.0 : 0.0);
}
else if (operation.GetType() == typeof(LessThan))
{
LessThan lessThan = (LessThan)operation;
return((Execute(lessThan.Argument1, functionRegistry, constantRegistry, variables) < Execute(lessThan.Argument2, functionRegistry, constantRegistry, variables)) ? 1.0 : 0.0);
}
else if (operation.GetType() == typeof(LessOrEqualThan))
{
LessOrEqualThan lessOrEqualThan = (LessOrEqualThan)operation;
return((Execute(lessOrEqualThan.Argument1, functionRegistry, constantRegistry, variables) <= Execute(lessOrEqualThan.Argument2, functionRegistry, constantRegistry, variables)) ? 1.0 : 0.0);
}
else if (operation.GetType() == typeof(GreaterThan))
{
GreaterThan greaterThan = (GreaterThan)operation;
return((Execute(greaterThan.Argument1, functionRegistry, constantRegistry, variables) > Execute(greaterThan.Argument2, functionRegistry, constantRegistry, variables)) ? 1.0 : 0.0);
}
else if (operation.GetType() == typeof(GreaterOrEqualThan))
{
GreaterOrEqualThan greaterOrEqualThan = (GreaterOrEqualThan)operation;
return((Execute(greaterOrEqualThan.Argument1, functionRegistry, constantRegistry, variables) >= Execute(greaterOrEqualThan.Argument2, functionRegistry, constantRegistry, variables)) ? 1.0 : 0.0);
}
else if (operation.GetType() == typeof(Equal))
{
Equal equal = (Equal)operation;
return((Execute(equal.Argument1, functionRegistry, constantRegistry, variables) == Execute(equal.Argument2, functionRegistry, constantRegistry, variables)) ? 1.0 : 0.0);
}
else if (operation.GetType() == typeof(NotEqual))
{
NotEqual notEqual = (NotEqual)operation;
return((Execute(notEqual.Argument1, functionRegistry, constantRegistry, variables) != Execute(notEqual.Argument2, functionRegistry, constantRegistry, variables)) ? 1.0 : 0.0);
}
else if (operation.GetType() == typeof(Function))
{
Function function = (Function)operation;
FunctionInfo functionInfo = functionRegistry.GetFunctionInfo(function.FunctionName);
double[] arguments = new double[functionInfo.IsDynamicFunc ? function.Arguments.Count : functionInfo.NumberOfParameters];
for (int i = 0; i < arguments.Length; i++)
{
arguments[i] = Execute(function.Arguments[i], functionRegistry, constantRegistry, variables);
}
return(Invoke(functionInfo.Function, arguments));
}
else
{
throw new ArgumentException(string.Format("Unsupported operation \"{0}\".", operation.GetType().FullName), "operation");
}
}
private void GenerateMethodBody(ILGenerator generator, Operation operation,
IFunctionRegistry functionRegistry)
{
if (operation == null)
{
throw new ArgumentNullException("operation");
}
if (operation.GetType() == typeof(IntegerConstant))
{
IntegerConstant constant = (IntegerConstant)operation;
generator.Emit(OpCodes.Ldc_I4, constant.Value);
generator.Emit(OpCodes.Conv_R8);
}
else if (operation.GetType() == typeof(FloatingPointConstant))
{
FloatingPointConstant constant = (FloatingPointConstant)operation;
generator.Emit(OpCodes.Ldc_R8, constant.Value);
}
else if (operation.GetType() == typeof(Variable))
{
Type dictionaryType = typeof(Dictionary <string, double>);
Variable variable = (Variable)operation;
Label throwExceptionLabel = generator.DefineLabel();
Label returnLabel = generator.DefineLabel();
generator.Emit(OpCodes.Ldarg_0);
generator.Emit(OpCodes.Callvirt, typeof(FormulaContext).GetProperty("Variables").GetGetMethod());
generator.Emit(OpCodes.Ldstr, variable.Name);
generator.Emit(OpCodes.Callvirt, dictionaryType.GetMethod("ContainsKey", new Type[] { typeof(string) }));
generator.Emit(OpCodes.Ldc_I4_0);
generator.Emit(OpCodes.Ceq);
generator.Emit(OpCodes.Brtrue_S, throwExceptionLabel);
generator.Emit(OpCodes.Ldarg_0);
generator.Emit(OpCodes.Callvirt, typeof(FormulaContext).GetProperty("Variables").GetGetMethod());
generator.Emit(OpCodes.Ldstr, variable.Name);
generator.Emit(OpCodes.Callvirt, dictionaryType.GetMethod("get_Item", new Type[] { typeof(string) }));
generator.Emit(OpCodes.Br_S, returnLabel);
generator.MarkLabel(throwExceptionLabel);
generator.Emit(OpCodes.Ldstr, string.Format("The variable \"{0}\" used is not defined.", variable.Name));
generator.Emit(OpCodes.Newobj, typeof(VariableNotDefinedException).GetConstructor(new Type[] { typeof(string) }));
generator.Emit(OpCodes.Throw);
generator.MarkLabel(returnLabel);
}
else if (operation.GetType() == typeof(Multiplication))
{
Multiplication multiplication = (Multiplication)operation;
GenerateMethodBody(generator, multiplication.Argument1, functionRegistry);
GenerateMethodBody(generator, multiplication.Argument2, functionRegistry);
generator.Emit(OpCodes.Mul);
}
else if (operation.GetType() == typeof(Addition))
{
Addition addition = (Addition)operation;
GenerateMethodBody(generator, addition.Argument1, functionRegistry);
GenerateMethodBody(generator, addition.Argument2, functionRegistry);
generator.Emit(OpCodes.Add);
}
else if (operation.GetType() == typeof(Subtraction))
{
Subtraction addition = (Subtraction)operation;
GenerateMethodBody(generator, addition.Argument1, functionRegistry);
GenerateMethodBody(generator, addition.Argument2, functionRegistry);
generator.Emit(OpCodes.Sub);
}
else if (operation.GetType() == typeof(Division))
{
Division division = (Division)operation;
GenerateMethodBody(generator, division.Dividend, functionRegistry);
GenerateMethodBody(generator, division.Divisor, functionRegistry);
generator.Emit(OpCodes.Div);
}
else if (operation.GetType() == typeof(Modulo))
{
Modulo modulo = (Modulo)operation;
GenerateMethodBody(generator, modulo.Dividend, functionRegistry);
GenerateMethodBody(generator, modulo.Divisor, functionRegistry);
generator.Emit(OpCodes.Rem);
}
else if (operation.GetType() == typeof(Exponentiation))
{
Exponentiation exponentation = (Exponentiation)operation;
GenerateMethodBody(generator, exponentation.Base, functionRegistry);
GenerateMethodBody(generator, exponentation.Exponent, functionRegistry);
generator.Emit(OpCodes.Call, typeof(Math).GetMethod("Pow"));
}
else if (operation.GetType() == typeof(UnaryMinus))
{
UnaryMinus unaryMinus = (UnaryMinus)operation;
GenerateMethodBody(generator, unaryMinus.Argument, functionRegistry);
generator.Emit(OpCodes.Neg);
}
else if (operation.GetType() == typeof(Function))
{
Function function = (Function)operation;
FunctionInfo functionInfo = functionRegistry.GetFunctionInfo(function.FunctionName);
Type funcType = GetFuncType(functionInfo.NumberOfParameters);
generator.Emit(OpCodes.Ldarg_0);
generator.Emit(OpCodes.Callvirt, typeof(FormulaContext).GetProperty("FunctionRegistry").GetGetMethod());
generator.Emit(OpCodes.Ldstr, function.FunctionName);
generator.Emit(OpCodes.Callvirt, typeof(IFunctionRegistry).GetMethod("GetFunctionInfo", new Type[] { typeof(string) }));
generator.Emit(OpCodes.Callvirt, typeof(FunctionInfo).GetProperty("Function").GetGetMethod());
generator.Emit(OpCodes.Castclass, funcType);
for (int i = 0; i < functionInfo.NumberOfParameters; i++)
{
GenerateMethodBody(generator, function.Arguments[i], functionRegistry);
}
generator.Emit(OpCodes.Call, funcType.GetMethod("Invoke"));
}
else
{
throw new ArgumentException(string.Format("Unsupported operation \"{0}\".", operation.GetType().FullName), "operation");
}
}
private Expression GenerateMethodBody(Operation operation, ParameterExpression contextParameter,
IFunctionRegistry functionRegistry)
{
if (operation == null)
{
throw new ArgumentNullException("operation");
}
if (operation.GetType() == typeof(IntegerConstant))
{
IntegerConstant constant = (IntegerConstant)operation;
return(Expression.Convert(Expression.Constant(constant.Value, typeof(int)), typeof(double)));
}
else if (operation.GetType() == typeof(FloatingPointConstant))
{
FloatingPointConstant constant = (FloatingPointConstant)operation;
return(Expression.Constant(constant.Value, typeof(double)));
}
else if (operation.GetType() == typeof(Variable))
{
Type contextType = typeof(FormulaContext);
Type dictionaryType = typeof(IDictionary <string, double>);
Variable variable = (Variable)operation;
Expression getVariables = Expression.Property(contextParameter, "Variables");
ParameterExpression value = Expression.Variable(typeof(double), "value");
Expression variableFound = Expression.Call(getVariables,
dictionaryType.GetRuntimeMethod("TryGetValue", new Type[] { typeof(string), typeof(double).MakeByRefType() }),
Expression.Constant(variable.Name),
value);
Expression throwException = Expression.Throw(
Expression.New(typeof(VariableNotDefinedException).GetConstructor(new Type[] { typeof(string) }),
Expression.Constant(string.Format("The variable \"{0}\" used is not defined.", variable.Name))));
LabelTarget returnLabel = Expression.Label(typeof(double));
return(Expression.Block(
new[] { value },
Expression.IfThenElse(
variableFound,
Expression.Return(returnLabel, value),
throwException
),
Expression.Label(returnLabel, Expression.Constant(0.0))
));
}
else if (operation.GetType() == typeof(Multiplication))
{
Multiplication multiplication = (Multiplication)operation;
Expression argument1 = GenerateMethodBody(multiplication.Argument1, contextParameter, functionRegistry);
Expression argument2 = GenerateMethodBody(multiplication.Argument2, contextParameter, functionRegistry);
return(Expression.Multiply(argument1, argument2));
}
else if (operation.GetType() == typeof(Addition))
{
Addition addition = (Addition)operation;
Expression argument1 = GenerateMethodBody(addition.Argument1, contextParameter, functionRegistry);
Expression argument2 = GenerateMethodBody(addition.Argument2, contextParameter, functionRegistry);
return(Expression.Add(argument1, argument2));
}
else if (operation.GetType() == typeof(Subtraction))
{
Subtraction addition = (Subtraction)operation;
Expression argument1 = GenerateMethodBody(addition.Argument1, contextParameter, functionRegistry);
Expression argument2 = GenerateMethodBody(addition.Argument2, contextParameter, functionRegistry);
return(Expression.Subtract(argument1, argument2));
}
else if (operation.GetType() == typeof(Division))
{
Division division = (Division)operation;
Expression dividend = GenerateMethodBody(division.Dividend, contextParameter, functionRegistry);
Expression divisor = GenerateMethodBody(division.Divisor, contextParameter, functionRegistry);
return(Expression.Divide(dividend, divisor));
}
else if (operation.GetType() == typeof(Modulo))
{
Modulo modulo = (Modulo)operation;
Expression dividend = GenerateMethodBody(modulo.Dividend, contextParameter, functionRegistry);
Expression divisor = GenerateMethodBody(modulo.Divisor, contextParameter, functionRegistry);
return(Expression.Modulo(dividend, divisor));
}
else if (operation.GetType() == typeof(Exponentiation))
{
Exponentiation exponentation = (Exponentiation)operation;
Expression @base = GenerateMethodBody(exponentation.Base, contextParameter, functionRegistry);
Expression exponent = GenerateMethodBody(exponentation.Exponent, contextParameter, functionRegistry);
return(Expression.Call(null, typeof(Math).GetRuntimeMethod("Pow", new Type[] { typeof(double), typeof(double) }), @base, exponent));
}
else if (operation.GetType() == typeof(UnaryMinus))
{
UnaryMinus unaryMinus = (UnaryMinus)operation;
Expression argument = GenerateMethodBody(unaryMinus.Argument, contextParameter, functionRegistry);
return(Expression.Negate(argument));
}
else if (operation.GetType() == typeof(LessThan))
{
LessThan lessThan = (LessThan)operation;
Expression argument1 = GenerateMethodBody(lessThan.Argument1, contextParameter, functionRegistry);
Expression argument2 = GenerateMethodBody(lessThan.Argument2, contextParameter, functionRegistry);
return(Expression.Condition(Expression.LessThan(argument1, argument2),
Expression.Constant(1.0),
Expression.Constant(0.0)));
}
else if (operation.GetType() == typeof(LessOrEqualThan))
{
LessOrEqualThan lessOrEqualThan = (LessOrEqualThan)operation;
Expression argument1 = GenerateMethodBody(lessOrEqualThan.Argument1, contextParameter, functionRegistry);
Expression argument2 = GenerateMethodBody(lessOrEqualThan.Argument2, contextParameter, functionRegistry);
return(Expression.Condition(Expression.LessThanOrEqual(argument1, argument2),
Expression.Constant(1.0),
Expression.Constant(0.0)));
}
else if (operation.GetType() == typeof(GreaterThan))
{
GreaterThan greaterThan = (GreaterThan)operation;
Expression argument1 = GenerateMethodBody(greaterThan.Argument1, contextParameter, functionRegistry);
Expression argument2 = GenerateMethodBody(greaterThan.Argument2, contextParameter, functionRegistry);
return(Expression.Condition(Expression.GreaterThan(argument1, argument2),
Expression.Constant(1.0),
Expression.Constant(0.0)));
}
else if (operation.GetType() == typeof(GreaterOrEqualThan))
{
GreaterOrEqualThan greaterOrEqualThan = (GreaterOrEqualThan)operation;
Expression argument1 = GenerateMethodBody(greaterOrEqualThan.Argument1, contextParameter, functionRegistry);
Expression argument2 = GenerateMethodBody(greaterOrEqualThan.Argument2, contextParameter, functionRegistry);
return(Expression.Condition(Expression.GreaterThanOrEqual(argument1, argument2),
Expression.Constant(1.0),
Expression.Constant(0.0)));
}
else if (operation.GetType() == typeof(Equal))
{
Equal equal = (Equal)operation;
Expression argument1 = GenerateMethodBody(equal.Argument1, contextParameter, functionRegistry);
Expression argument2 = GenerateMethodBody(equal.Argument2, contextParameter, functionRegistry);
return(Expression.Condition(Expression.Equal(argument1, argument2),
Expression.Constant(1.0),
Expression.Constant(0.0)));
}
else if (operation.GetType() == typeof(NotEqual))
{
NotEqual notEqual = (NotEqual)operation;
Expression argument1 = GenerateMethodBody(notEqual.Argument1, contextParameter, functionRegistry);
Expression argument2 = GenerateMethodBody(notEqual.Argument2, contextParameter, functionRegistry);
return(Expression.Condition(Expression.NotEqual(argument1, argument2),
Expression.Constant(1.0),
Expression.Constant(0.0)));
}
else if (operation.GetType() == typeof(Function))
{
Function function = (Function)operation;
FunctionInfo functionInfo = functionRegistry.GetFunctionInfo(function.FunctionName);
Type funcType;
Type[] parameterTypes;
Expression[] arguments;
if (functionInfo.IsDynamicFunc)
{
funcType = typeof(DynamicFunc <double, double>);
parameterTypes = new Type[] { typeof(double[]) };
Expression[] arrayArguments = new Expression[function.Arguments.Count];
for (int i = 0; i < function.Arguments.Count; i++)
{
arrayArguments[i] = GenerateMethodBody(function.Arguments[i], contextParameter, functionRegistry);
}
arguments = new Expression[1];
arguments[0] = NewArrayExpression.NewArrayInit(typeof(double), arrayArguments);
}
else
{
funcType = GetFuncType(functionInfo.NumberOfParameters);
parameterTypes = (from i in Enumerable.Range(0, functionInfo.NumberOfParameters)
select typeof(double)).ToArray();
arguments = new Expression[functionInfo.NumberOfParameters];
for (int i = 0; i < functionInfo.NumberOfParameters; i++)
{
arguments[i] = GenerateMethodBody(function.Arguments[i], contextParameter, functionRegistry);
}
}
Expression getFunctionRegistry = Expression.Property(contextParameter, "FunctionRegistry");
ParameterExpression functionInfoVariable = Expression.Variable(typeof(FunctionInfo));
return(Expression.Block(
new[] { functionInfoVariable },
Expression.Assign(
functionInfoVariable,
Expression.Call(getFunctionRegistry, typeof(IFunctionRegistry).GetRuntimeMethod("GetFunctionInfo", new Type[] { typeof(string) }), Expression.Constant(function.FunctionName))
),
Expression.Call(
Expression.Convert(Expression.Property(functionInfoVariable, "Function"), funcType),
funcType.GetRuntimeMethod("Invoke", parameterTypes),
arguments)));
}
else
{
throw new ArgumentException(string.Format("Unsupported operation \"{0}\".", operation.GetType().FullName), "operation");
}
}
public void RegisterFunction(string functionName, Delegate function, bool isOverWritable)
{
if (string.IsNullOrEmpty(functionName))
{
throw new ArgumentNullException("functionName");
}
if (function == null)
{
throw new ArgumentNullException("function");
}
Type funcType = function.GetType();
if (!funcType.FullName.StartsWith("System.Func"))
{
throw new ArgumentException("Only System.Func delegates are permitted.", "function");
}
#if NETFX_CORE
foreach (Type genericArgument in funcType.GenericTypeArguments)
#else
foreach (Type genericArgument in funcType.GetGenericArguments())
#endif
{ if (genericArgument != typeof(double))
{
throw new ArgumentException("Only doubles are supported as function arguments", "function");
}
}
functionName = ConvertFunctionName(functionName);
if (functions.ContainsKey(functionName) && !functions[functionName].IsOverWritable)
{
string message = string.Format("The function \"{0}\" cannot be overwriten.", functionName);
throw new Exception(message);
}
#if NETFX_CORE
int numberOfParameters = function.GetMethodInfo().GetParameters().Length;
#else
int numberOfParameters = function.Method.GetParameters().Length;
#endif
if (functions.ContainsKey(functionName) && functions[functionName].NumberOfParameters != numberOfParameters)
{
string message = string.Format("The number of parameters cannot be changed when overwriting a method.");
throw new Exception(message);
}
FunctionInfo functionInfo = new FunctionInfo(functionName, numberOfParameters, isOverWritable, function);
if (functions.ContainsKey(functionName))
{
functions[functionName] = functionInfo;
}
else
{
functions.Add(functionName, functionInfo);
}
}
