public EarleStackFrameExecutor(EarleFunction function, EarleStackFrame parentFrame, int callerIp,
EarleValue target,
IEarleRuntimeScope superScope, EarleDictionary locals)
: base(target)
{
Frame = parentFrame.SpawnChild(function, this, callerIp);
Scopes.Push(new EarleRuntimeScope(superScope, locals));
}
public virtual bool SetValue(string name, EarleValue value)
{
if ((_superScope?.GetValue(name) ?? EarleValue.Undefined).HasValue)
{
return _superScope.SetValue(name, value);
}
if (CanAssignVariableInScope(name))
{
_locals[name] = value;
return true;
}
return false;
}
public virtual IEarleStackFrameExecutor CreateFrameExecutor(EarleStackFrame parentFrame, int callerIp,
EarleValue target, EarleValue[] arguments)
{
if (arguments == null) throw new ArgumentNullException(nameof(arguments));
var locals = new EarleDictionary();
var index = 0;
if (Parameters == null)
{
throw new Exception("Parameters cannot be null in order for a EarleStackFrameExecutor to be created.");
}
foreach (var parameter in Parameters)
{
locals[parameter] = index >= arguments.Length ? EarleValue.Undefined : arguments[index];
index++;
}
return new EarleStackFrameExecutor(this, parentFrame, callerIp, target, File, locals);
}
/// <summary>
/// Creates the frame executor this instruction will invoke.
/// </summary>
/// <param name="superFrame">The super frame.</param>
/// <param name="callerIp">The caller ip.</param>
/// <returns>The newly created stack frame executor.</returns>
protected virtual IEarleStackFrameExecutor CreateFrameExecutor(EarleStackFrame superFrame, int callerIp)
{
var argumentCount = GetInt32();
var funcValue = Pop();
// Pop the arguments of the stack.
var args = new EarleValue[argumentCount];
for (var i = 0; i < argumentCount; i++)
args[argumentCount - 1 - i] = Pop();
// Pop the call target of the stack.
var target = HasTarget ? Pop() : EarleValue.Undefined;
// Find the function to call.
var function = funcValue.As<EarleFunctionCollection>()?.GetBestOverload(argumentCount)
?? funcValue.As<EarleFunction>();
// If no function was specified, show an error and push NULL onto the stack instead of the result.
if (function == null)
{
// Throw a tailored warning.
if (funcValue.As<EarleFunctionCollection>()?.Any() ?? false)
Frame.Runtime.HandleWarning(
$"No suitable overload can be found of `{funcValue.As<EarleFunctionCollection>().FirstOrDefault()?.Name}`.");
else if (funcValue.As<EarleFunctionCollection>()?.Any() ?? false)
Frame.Runtime.HandleWarning("No suitable overload can be found.");
else if (!funcValue.HasValue)
Frame.Runtime.HandleWarning("A null pointer cannot be invoked.");
else
Frame.Runtime.HandleWarning($"{funcValue.Value?.GetType()} cannot be invoked.");
// Push NULL onto the stack to as the result.
Push(EarleValue.Undefined);
return null;
}
// Create the frame executor of the function.
return function.CreateFrameExecutor(superFrame, callerIp, target, args);
}
public EarleValue? Invoke(EarleCompletionHandler completionHandler, EarleValue target, params EarleValue[] args)
{
var thread = new EarleThread(completionHandler);
var rootFrame = new EarleStackFrame(File.Runtime, null, null, EarleStackFrame.RootFrameIP, null, thread);
var frame = CreateFrameExecutor(rootFrame, EarleStackFrame.RootCallIP, target,
args?.ToArray() ?? new EarleValue[0]);
thread.AttachExecutor(frame);
return thread.Run();
}
private static bool IsDefined(EarleValue value)
{
return value.Value != null;
}
public virtual bool SetValue(string name, EarleValue value)
{
if (name == "self" || name == "thread")
{
Frame.Runtime.HandleWarning($"'{name}' cannot be set!");
return false;
}
return Scopes.Peek().SetValue(name, value);
}
public EarleBaseStackFrameExecutor(EarleValue target)
{
Target = target;
}
public void SetField(string name, EarleValue value)
{
// Values cannot be set.
}
/// <summary>
/// Runs the specified unary operator.
/// </summary>
/// <param name="operator">The operator to run.</param>
/// <param name="value">The value.</param>
/// <returns>The result of the operation.</returns>
public EarleValue RunUnaryOperator(OpCode @operator, EarleValue value)
{
Func<EarleValue, EarleValue> func;
return _unaryOperators.TryGetValue(new Tuple<OpCode, Type>(@operator, value.Value?.GetType()), out func)
? func(value)
: EarleValue.Undefined;
}
/// <summary>
/// Runs the specified binary operator.
/// </summary>
/// <param name="operator">The operator to run.</param>
/// <param name="left">The left value.</param>
/// <param name="right">The right value.</param>
/// <returns>The result of the operation.</returns>
public EarleValue RunBinaryOperator(OpCode @operator, EarleValue left, EarleValue right)
{
Tuple<bool, Func<EarleValue, EarleValue, EarleValue>> op;
if (
!_binaryOperators.TryGetValue(
new Tuple<OpCode, Type, Type>(@operator, left.Value?.GetType(), right.Value?.GetType()), out op) &&
!_binaryOperators.TryGetValue(new Tuple<OpCode, Type, Type>(@operator, null, right.Value?.GetType()),
out op) &&
!_binaryOperators.TryGetValue(new Tuple<OpCode, Type, Type>(@operator, left.Value?.GetType(), null),
out op))
return EarleValue.Undefined;
if (op.Item1)
{
var tmp = left;
left = right;
right = tmp;
}
return op.Item2(left, right);
}
/// <summary>
/// Initializes a new instance of the <see cref="EarleEventNotifyEventArgs" /> class.
/// </summary>
/// <param name="eventName">Name of the event.</param>
/// <param name="firer">The firer of the event.</param>
public EarleEventNotifyEventArgs(string eventName, EarleValue firer)
{
EventName = eventName;
Firer = firer;
}
private static void Notify(EarleStackFrame frame, string eventName, EarleValue[] optionals)
{
GetManager(frame, "notify")
?.Notify(eventName, optionals?.FirstOrDefault() ?? EarleValue.Undefined);
}
/// <summary>
/// Called when an event is fired.
/// </summary>
/// <param name="sender">The sender.</param>
/// <param name="e">The <see cref="EarleEventNotifyEventArgs" /> instance containing the event data.</param>
private void OnEventFired(object sender, EarleEventNotifyEventArgs e)
{
if (e.EventName == _eventName)
{
_hasFired = true;
_firer = e.Firer;
}
}
/// <summary>
/// Initializes a new instance of the <see cref="WaitTillStackFrameExecutor" /> class.
/// </summary>
/// <param name="parentFrame">The parent frame.</param>
/// <param name="target">The target.</param>
/// <param name="eventManager">The event manager.</param>
/// <param name="eventName">Name of the event.</param>
/// <exception cref="System.ArgumentNullException">
/// Thrown if <see cref="eventManager" /> or <see cref="eventName" /> is
/// null.
/// </exception>
public WaitTillStackFrameExecutor(EarleStackFrame parentFrame, EarleValue target,
IEarleEventManager eventManager,
string eventName)
: base(target)
{
if (eventManager == null)
throw new ArgumentNullException(nameof(eventManager));
if (eventName == null)
throw new ArgumentNullException(nameof(eventName));
Frame = parentFrame.SpawnChild(null, this, EarleStackFrame.SleepCallIP);
_eventName = eventName;
eventManager.EventFired += OnEventFired;
}