private bool parameter()
{
int line = _line;
int position = _position;
string type = oneOf(_dataTypes);
if (type == null)
{
return(false);
}
if (!identifier())
{
Log.Error("Expected identifier", _filename, _line, _position);
}
Node lvalue = _stack.Pop();
DataType dataType = _dataTypeMapping[type];
IdentifierDefinitionNode node = new IdentifierDefinitionNode(dataType, lvalue, null, _filename, line, position);
_stack.Push(node);
return(true);
}
private bool identifierDefinition()
{
int line = _line;
int position = _position;
if (!parameter())
{
return(false);
}
IdentifierDefinitionNode identifier = (IdentifierDefinitionNode)_stack.Pop();
Node rvalue = null;
// default value
if (accept("="))
{
expression();
rvalue = _stack.Pop();
identifier.Value = rvalue;
}
// function definition
else if (accept("("))
{
// create new scope here so that parameters don't leak out
SymbolTable.EnterScope();
List <Node> parameters = parameterList();
block();
SymbolTable.ExitScope();
Node functionBody = _stack.Pop();
CallableType type = new CallableType(identifier.Type, parameters, functionBody);
SymbolTable.CurrentScope.Callables[identifier.Symbol.Identifier] = type;
FunctionDefinitionNode node = new FunctionDefinitionNode(type, identifier.Symbol, _filename, line, position);
_stack.Push(node);
return(true);
}
_stack.Push(identifier);
return(true);
}