private object InvokeMethodSymbol(MethodSymbol method, List<Ast> args)
{
// create a new memory scope. this is where arguments will get defined
// we wont overwrite any memory values since they will all be local here
MemorySpaces.CreateScope();
var count = 0;
if (method.MethodDeclr.Arguments.Count != args.Count)
{
throw new InvalidSyntax(String.Format("Wrong number of arguments passed to method {0}. Got {1}, expected {2}",
method.MethodDeclr.MethodName.Token.TokenValue,
args.Count, method.MethodDeclr.Arguments.Count));
}
foreach (VarDeclrAst expectedArgument in method.MethodDeclr.Arguments)
{
var currentArgument = args[count];
var oldmemory = MemorySpaces.Current;
// if the argument is coming from somewhere else, make sure to be able to
// load the argument from its preferred space.
if (currentArgument.CallingMemory != null)
{
MemorySpaces.Current = currentArgument.CallingMemory;
}
var value = GetValue(Exec(currentArgument));
// since we were just loading values from the argument space
// switch back to the current space so we can assign the argument value
// into our local working memory
MemorySpaces.Current = oldmemory;
if (expectedArgument.VariableValue == null)
{
MemorySpaces.Current.Define(expectedArgument.Token.TokenValue, value);
}
else
{
MemorySpaces.Current.Assign(expectedArgument.Token.TokenValue, value);
}
// if the passed in argument is a word and not a literal (like string or bool) then
// pull its value from memory so we can match type to the target type
var resolvedSymbol = (currentArgument.Token.TokenType == TokenType.Word ?
MemorySpaces.Current.Get(currentArgument.Token.TokenValue)
: args[count]) as Symbol;
var resolvedType = resolvedSymbol != null ? resolvedSymbol.Type : currentArgument.AstSymbolType;
if (currentArgument is MethodDeclr)
{
resolvedType = new BuiltInType(ExpressionTypes.Method);
}
if (!TokenUtil.EqualOrPromotable(expectedArgument.AstSymbolType, resolvedType))
{
throw new InvalidSyntax(String.Format("Cannot pass argument {0} of type {1} to function {2} as argument {3} of type {4}",
currentArgument.Token.TokenValue,
currentArgument.AstSymbolType.TypeName,
method.MethodDeclr.MethodName.Token.TokenValue,
expectedArgument.VariableName.Token.TokenValue,
expectedArgument.AstSymbolType.TypeName));
}
count++;
}
var val = Exec(method.MethodDeclr.Body);
MemorySpaces.PopScope();
return val;
}
private void ValidateReturnStatementType(MethodDeclr ast, Symbol symbol)
{
if (!ResolvingTypes)
{
return;
}
IType returnStatementType;
// no return found
if (ast.ReturnAst == null)
{
returnStatementType = new BuiltInType(ExpressionTypes.Void);
}
else
{
returnStatementType = ast.ReturnAst.AstSymbolType;
}
var delcaredSymbol = ScopeUtil.CreateSymbolType(ast.MethodReturnType);
// if its inferred, just use whatever the return statement i
if (delcaredSymbol.ExpressionType == ExpressionTypes.Inferred)
{
return;
}
if (!TokenUtil.EqualOrPromotable(returnStatementType.ExpressionType, delcaredSymbol.ExpressionType))
{
throw new InvalidSyntax(String.Format("Return type {0} for function {1} is not of the same type of declared method (type {2})",
returnStatementType.ExpressionType, symbol.Name, delcaredSymbol.ExpressionType));
}
}