// ISCNode members
public void Evaluate(Scope scope)
{
// Predefined functinos
if (Function.Name == "putchar")
{
foreach (IExprNode expr in Parameters)
{
expr.Evaluate(scope);
Console.WriteLine(expr.IntValue);
}
return;
}
Scope globalScope = scope.GlobalScope;
if (FuncDeclsContainer.Contains(Function))
throw new InterpreterException("Call to undefined function: " + Function.Name);
Scope childScope = new Scope(globalScope);
FuncDefNode funcDef = globalScope.FuncDefs.Get(Function);
for (int i = 0; i < Parameters.Count; ++i)
{
Parameters[i].Evaluate(scope);
childScope.Add(funcDef.Parameters[i].Name, new IntVariable(Parameters[i].IntValue));
}
funcDef.Body.Evaluate(childScope);
}
// ISCNode members
public void Evaluate(Scope scope)
{
Debug.Assert(Left != null && Right != null, "Null operand in binary expression");
Left.Evaluate(scope);
Right.Evaluate(scope);
switch (Type)
{
case BinaryExpressionType.ADD:
intValue_ = Left.IntValue + Right.IntValue;
break;
case BinaryExpressionType.SUB:
intValue_ = Left.IntValue - Right.IntValue;
break;
case BinaryExpressionType.MUL:
intValue_ = Left.IntValue * Right.IntValue;
break;
case BinaryExpressionType.DIV:
intValue_ = Left.IntValue / Right.IntValue;
break;
case BinaryExpressionType.MOD:
intValue_ = Left.IntValue % Right.IntValue;
break;
case BinaryExpressionType.ASSIGN:
IdentNode identNode = Left as IdentNode;
if (identNode == null)
throw new InterpreterException("Left operand of '=' must be an lvalue");
if (!scope.IsDefined(identNode.Name))
throw new InterpreterException("Undefined variable: " + identNode.Name);
intValue_ = Right.IntValue;
scope.Get(identNode.Name).Value = intValue_;
break;
default:
throw new InterpreterException("Unexpected expression type");
}
}
// ISCNode members
public void Evaluate(Scope scope)
{
foreach (ISCNode statement in Statements)
{
if (statement is CompoundStatementNode)
{
Scope childScope = new Scope(scope);
statement.Evaluate(childScope);
}
else if (statement is IExprNode)
{
statement.Evaluate(scope);
}
else if (statement is VarDefNode)
{
scope.Add(statement as VarDefNode);
}
}
// TODO: Evaluate compound statement
}
// ISCNode members
public void Evaluate(Scope parentScope)
{
// Nothing to do here
}
public void Evaluate(Scope parentScope)
{
// Really nothing to do here
}
public void Run()
{
Scope scope = new Scope(globalScope_);
mainFuncDef_.Body.Evaluate(scope);
}
// ISCNode members
public void Evaluate(Scope parentScope)
{
}
// ISCNode members
public void Evaluate(Scope scope)
{
if (!scope.IsDefined(Name))
throw new InterpreterException("Undefined variable: " + Name);
intValue_ = scope.Get(Name).Value;
}
public Scope(Scope parent = null)
{
Parent = parent;
}
// ISCNode members
public void Evaluate(Scope parentScope)
{
// TODO: evaluate root node
}
