public State()
{
_stack = new Stack<Step>();
_prevStep = null;
_resultStack = new Stack<object>();
_constScope = new ConstScope( null );
_lookupScope = new LookupScope( _constScope );
_rootScope = new StandardScope( _lookupScope );
_baggage = new StandardScope();
}
/// <summary>
/// Returns true if this step represents the marker that ends the whole while loop.
/// </summary>
public static bool IsLoopMarker( Step step )
{
return step.description == LoopMarker;
}
/// <summary>
/// Returns true if this step represents the marker that will start a new loop iteration.
/// </summary>
/// <remarks>The marker itself should be left on.</remarks>
public static bool IsBlockMarker( Step step )
{
return step.description == BlockMarker;
}
static bool IsTryMarker( Step step )
{
return step.description == TryMarker;
}
/// <summary>
/// Returns true if the specified step is a function call scope marker.
/// </summary>
public static bool IsScopeMarker( Step s )
{
return s.description == ScopeMarker;
}
/// <summary>
/// Push a set of actions onto the step stack. They are pushed in order.
/// </summary>
public void pushActions( Step[] actions )
{
foreach( Step a in actions )
_stack.Push( a );
}
/// <summary>
/// Push a single action onto the step stack, creating a new security context.
/// </summary>
public void pushActionAndSecurityContext( Step action, ISecurityContext context )
{
action.securityContext = context;
action.description = "security context: {0}".FormatI( context.name );
_stack.Push( action );
}
/// <summary>
/// Push a single action onto the step stack, creating a new variable scope.
/// </summary>
public void pushActionAndScope( Step action, IScope scope )
{
action.scope = scope;
_stack.Push( action );
}
/// <summary>
/// Push a single action onto the step stack.
/// </summary>
public void pushAction( Step action )
{
_stack.Push( action );
}
/// <summary>
/// Pop a single action from the step stack.
/// </summary>
public Step popAction()
{
if( !_stack.Any() )
throw new InvalidOperationException( "Action stack is empty" );
_prevStep = _stack.Pop();
return _prevStep;
}