public Variable getVariable(Identifier identifier)
{
Variable variable = variables[identifier.name];
if (variable == null)
{
return getParentVariable(identifier);
}
return variable;
}
// assignment_stmt = { lvalue " = " } ( expression | new_instance ) terminator ;
public static Assignment produce(Queue<Token> tokens)
{
List<Symbol.Symbol> childSymbols = new List<Symbol.Symbol>();
// lvalue
if (tokens.First().tokenType != TokenType.IDENTIFIER)
return null;
Token identifierToken = tokens.First();
Identifier identifier = new Identifier(identifierToken);
tokens.Dequeue();
// " is "
if (tokens.First().tokenType != TokenType.ASSIGNMENT)
{
// there is no assign, this might be a method call, stop processing
tokens.Enqueue(identifierToken);
return null;
}
tokens.Dequeue();
if (tokens.First().tokenType == TokenType.NEW)
{
/*
// new_instance
NewInstance newInstance = NewInstanceFactory.produce(symbols);
if(newInstance == null)
throw new ParsingException("NewInstance expected.", symbols.peek());
// terminator
optionalTerminator(symbols);
return Optional.of(new NewInstanceAssignment(identifier, newInstance));
*/
// TODO: Fix me
return null;
}
else {
// expression
Expression expression = ExpressionFactory.produce(tokens);
// terminator
optionalTerminator(tokens);
return new Assignment(identifier, expression);
}
}
//public void AddFunction(Function function)
//{
//}
//public List<Function> GetFunctions()
//{
//}
public Scope findIdentifier(Identifier identifier)
{
Scope scope = this;
do
{
if (scope.variables[identifier.name] == null)
{
scope = scope.parentScope;
}
else {
return scope;
}
} while (scope.parentScope != null);
return null;
}
public Function getFunction(Identifier identifier)
{
Function function = recipies[identifier.name];
if (function == null)
{
if (parentScope != null)
{
return parentScope.getFunction(identifier);
}
else {
throw new VirtualMachineRuntimeException("Function " + identifier.name + " does not exist.");
}
}
return function;
}
public virtual bool visit(Identifier identifier)
{
var value = scope.getVariable(identifier).value;
evaluation.Push(value);
return true;
}
public VariableDoesNotExistException(Identifier identifier) : base(message)
{
message = identifier.name + "does not exist";
}
public Variable(Identifier identifier, Value.Value value)
{
this.identifier = identifier;
this.value = value;
}
public Assignment(Identifier identifier, Expressions.Expression expression) : base(expression.token)
{
this.identifier = identifier;
this.expression = expression;
}
public FunctionCall(Identifier functionName, ArgumentList argumentList) : base(functionName.token)
{
this.functionName = functionName;
this.argumentList = argumentList;
}
public FunctionCall(Identifier functionName) : base(functionName.token)
{
this.functionName = functionName;
argumentList = null;
}
public bool visit(Identifier identifier)
{
return true;
}
public void setVariable(Identifier identifier, Value.Value value)
{
string name = identifier.name;
Variable variable = new Variable(identifier, value);
variables.Remove(name);
variables.Add(name, variable);
Console.WriteLine("SET - Variable " + name + " = " + value.getText());
}
public void setVariable(Identifier identifier)
{
throw new NotImplementedException();
}
private Variable getParentVariable(Identifier identifier)
{
if (parentScope != null)
{
return parentScope.getVariable(identifier);
}
throw new VariableDoesNotExistException(identifier);
}