/// <summary>
/// Visits a STABILIZE expression
/// </summary>
/// <param name="stabilizeExpression"></param>
protected virtual void VisitStabilizeExpression(StabilizeExpression stabilizeExpression)
{
if (stabilizeExpression != null)
{
VisitExpression(stabilizeExpression.Expression);
VisitExpression(stabilizeExpression.Condition);
VisitExpression(stabilizeExpression.InitialValue);
}
}
/// <summary>
/// Evaluates a unary expression
/// . NOT expression
/// . Term
/// </summary>
/// <param name="enclosing"></param>
/// <returns></returns>
private Expression EvaluateUnaryExpression()
{
Expression retVal = null;
string unaryOp = LookAhead(UnaryExpression.UNARY_OPERATORS);
if (unaryOp != null)
{
Match(unaryOp);
Expression expression = Expression(6);
retVal = new UnaryExpression(Root, expression, unaryOp);
}
else
{
if (LookAhead("STABILIZE"))
{
Match("STABILIZE");
Expression expression = Expression(0);
Match("INITIAL_VALUE");
Expression initialValue = Expression(0);
Match("STOP_CONDITION");
Expression condition = Expression(0);
retVal = new StabilizeExpression(Root, expression, initialValue, condition);
}
else
{
retVal = EvaluateStructure();
if (retVal == null)
{
retVal = EvaluateFunction();
}
if (retVal == null)
{
Term term = Term();
if (term != null)
{
retVal = new UnaryExpression(Root, term);
}
else if (LookAhead("("))
{
Match("(");
retVal = new UnaryExpression(Root, Expression(0));
Match(")");
if (retVal != null)
{
retVal = Continuation(retVal);
}
}
}
}
}
return(retVal);
}
/// <summary>
/// Visits a STABILIZE expression
/// </summary>
/// <param name="stabilizeExpression"></param>
protected virtual void VisitStabilizeExpression(StabilizeExpression stabilizeExpression)
{
if (stabilizeExpression != null)
{
VisitExpression(stabilizeExpression.Expression);
VisitExpression(stabilizeExpression.Condition);
VisitExpression(stabilizeExpression.InitialValue);
}
}
/// <summary>
/// Evaluates a unary expression
/// . NOT expression
/// . Term
/// </summary>
/// <returns></returns>
private Expression EvaluateUnaryExpression()
{
Expression retVal;
SkipWhiteSpaces();
int start = Index;
string unaryOp = LookAhead(UnaryExpression.UnaryOperators);
if (unaryOp != null)
{
Match(unaryOp);
Expression expression = Expression(6);
retVal = new UnaryExpression(Root, RootLog, expression, unaryOp, start, Index);
}
else
{
if (LookAhead("STABILIZE"))
{
Match("STABILIZE");
Expression expression = Expression(0);
Match("INITIAL_VALUE");
Expression initialValue = Expression(0);
Match("STOP_CONDITION");
Expression condition = Expression(0);
retVal = new StabilizeExpression(Root, RootLog, expression, initialValue, condition, start, Index);
}
else
{
retVal = EvaluateStructure();
if (retVal == null)
{
retVal = EvaluateFunction();
}
if (retVal == null)
{
Term term = Term();
if (term != null)
{
retVal = new UnaryExpression(Root, RootLog, term, start, Index);
}
else if (LookAhead("("))
{
Match("(");
retVal = new UnaryExpression(Root, RootLog, Expression(0), null, start, -1);
Match(")");
retVal.End = Index;
retVal = Continuation(retVal);
}
}
}
}
return retVal;
}
/// <summary>
/// Evaluates a unary expression
/// . NOT expression
/// . Term
/// </summary>
/// <param name="enclosing"></param>
/// <returns></returns>
private Expression EvaluateUnaryExpression()
{
Expression retVal = null;
string unaryOp = LookAhead(UnaryExpression.UNARY_OPERATORS);
if (unaryOp != null)
{
Match(unaryOp);
Expression expression = Expression(6);
retVal = new UnaryExpression(Root, expression, unaryOp);
}
else
{
if (LookAhead("STABILIZE"))
{
Match("STABILIZE");
Expression expression = Expression(0);
Match("INITIAL_VALUE");
Expression initialValue = Expression(0);
Match("STOP_CONDITION");
Expression condition = Expression(0);
retVal = new StabilizeExpression(Root, expression, initialValue, condition);
}
else
{
retVal = EvaluateStructure();
if (retVal == null)
{
retVal = EvaluateFunction();
}
if (retVal == null)
{
Term term = Term();
if (term != null)
{
retVal = new UnaryExpression(Root, term);
}
else if (LookAhead("("))
{
Match("(");
retVal = new UnaryExpression(Root, Expression(0));
Match(")");
if (retVal != null)
{
retVal = Continuation(retVal);
}
}
}
}
}
return retVal;
}