private IValue doFunctionCall([NotNull] ClepsParser.FunctionCallContext context, IValue target, ClepsType targetType, bool allowVoidReturn)
{
string targetFunctionName = context.FunctionName.GetText();
List <IValue> parameters = context._FunctionParameters.Select(p => Visit(p) as IValue).ToList();
return(doFunctionCall(context, targetFunctionName, parameters, target, targetType, allowVoidReturn));
}
/// <summary>
/// Exit a parse tree produced by <see cref="ClepsParser.functionCall"/>.
/// <para>The default implementation does nothing.</para>
/// </summary>
/// <param name="context">The parse tree.</param>
public virtual void ExitFunctionCall([NotNull] ClepsParser.FunctionCallContext context)
{
}
/// <summary>
/// Visit a parse tree produced by <see cref="ClepsParser.functionCall"/>.
/// <para>
/// The default implementation returns the result of calling <see cref="AbstractParseTreeVisitor{Result}.VisitChildren(IRuleNode)"/>
/// on <paramref name="context"/>.
/// </para>
/// </summary>
/// <param name="context">The parse tree.</param>
/// <return>The visitor result.</return>
public virtual Result VisitFunctionCall([NotNull] ClepsParser.FunctionCallContext context)
{
return(VisitChildren(context));
}
private IValue doFunctionCall(ClepsParser.FunctionCallContext functionCall, ClepsType targetType, bool isMemberFunctionsAccessible, bool allowVoidReturn)
{
ClepsClass targetClepsClass;
if (targetType is BasicClepsType)
{
targetClepsClass = ClassManager.GetClass(targetType.GetClepsTypeString());
}
else if (targetType is BasicStaticClepsType)
{
targetClepsClass = ClassManager.GetClass(targetType.GetClepsTypeString());
isMemberFunctionsAccessible = false;
}
else
{
throw new NotImplementedException("Function calls on non basic types not supported");
}
string targetFunctionName = functionCall.FunctionName.GetText();
List <IValue> parameters = functionCall._FunctionParameters.Select(p => Visit(p) as IValue).ToList();
ClepsType functionType = null;
if (targetClepsClass.StaticMemberMethods.ContainsKey(targetFunctionName))
{
functionType = targetClepsClass.StaticMemberMethods[targetFunctionName];
}
else if (isMemberFunctionsAccessible && targetClepsClass.MemberMethods.ContainsKey(targetFunctionName))
{
functionType = targetClepsClass.MemberMethods[targetFunctionName];
}
if (functionType == null)
{
string errorMessage = String.Format("Class {0} does not contain a function called {1}", targetClepsClass.FullyQualifiedName, targetFunctionName);
Status.AddError(new CompilerError(FileName, functionCall.Start.Line, functionCall.Start.Column, errorMessage));
//Just return something to avoid stalling compilation
return(CodeGenerator.CreateByte(0));
}
List <ClepsType> functionOverloads = new List <ClepsType> {
functionType
};
int matchedPosition;
string fnMatchErrorMessage;
if (!FunctionOverloadManager.FindMatchingFunctionType(functionOverloads, parameters, out matchedPosition, out fnMatchErrorMessage))
{
Status.AddError(new CompilerError(FileName, functionCall.Start.Line, functionCall.Start.Column, fnMatchErrorMessage));
//Just return something to avoid stalling compilation
return(CodeGenerator.CreateByte(0));
}
FunctionClepsType chosenFunctionType = functionOverloads[matchedPosition] as FunctionClepsType;
if (!allowVoidReturn && chosenFunctionType.ReturnType == VoidType.GetVoidType())
{
string errorMessage = String.Format("Function {0} does not return a value", targetFunctionName);
Status.AddError(new CompilerError(FileName, functionCall.Start.Line, functionCall.Start.Column, errorMessage));
//Just return something to avoid stalling compilation
return(CodeGenerator.CreateByte(0));
}
IValue returnValue = CodeGenerator.GetFunctionCallReturnValue(FullyQualifiedClassName, targetFunctionName, chosenFunctionType, parameters);
return(returnValue);
}
