public void FinalizeExpression()
{
for (int i = stacks.Count - 1; i >= 0; i--)
{
RusticStack stack = stacks[i];
stack.displayId = i;
stack.Prepare();
}
}
private void PutOperationOfLowerPriority(RusticOperation operation)
{
nextOperation = operation;
while (currentStack.priority > operation.GetPriorityWithOffset())
{
currentStack = currentStack.parent;
}
if (currentStack.priority < operation.GetPriorityWithOffset())
{
PutOperationOfHigherPriority(operation);
}
}
private void ChangePriority(int addition)
{
priorityOffset += addition;
if (addition > 0)
{
RusticStack newStack = new RusticStack(stacks.Count, currentStack, priorityOffset + RusticOperation.FirstPriority);
nextOperation.parameter = new Evaluators.StackReference(newStack);
currentStack.operations.Add(nextOperation);
int index = stacks.IndexOf(currentStack);
stacks.Insert(index + 1, newStack);
currentStack = newStack;
nextOperation = new Operations.Set();
}
}
public RusticExprBuilder(RusticExpr expression, RusticContext context)
{
if (expression?.stacks.Count > 0)
{
throw new Exception("RusticExpr instance was already built and should not be built again. Did you intend to ResetExpression?");
}
this.expression = expression;
this.context = context;
nextOperation = new Operations.Set();
priorityOffset = 0;
stacks?.Add(new RusticStack(0, null, 1));
currentStack = stacks?[0];
}
private void PutOperationOfHigherPriority(RusticOperation operation)
{
nextOperation = operation;
RusticOperation lastOperationFromStack = currentStack.operations[currentStack.operations.Count - 1];
RusticValueEvaluator lastOperationValue = lastOperationFromStack.parameter;
RusticStack newStack = new RusticStack(stacks.Count, currentStack, operation.GetPriorityWithOffset());
lastOperationFromStack.parameter = new Evaluators.StackReference(newStack);
RusticOperation newSetOperation = new Operations.Set();
newSetOperation.parameter = lastOperationValue;
newStack.operations.Add(newSetOperation);
int index = stacks.IndexOf(currentStack);
stacks.Insert(index + 1, newStack);
currentStack = newStack;
}
private void PutLeftOperationToken(RusticOperation operation)
{
if (currentStack.priority == operation.GetPriorityWithOffset())
{
currentStack.operations.Add(operation);
}
else
{
RusticStack newStack = new RusticStack(stacks.Count, currentStack, operation.GetPriorityWithOffset());
newStack.operations.Add(operation);
int index = stacks.IndexOf(currentStack);
stacks.Insert(index + 1, newStack);
PutCustomValueToken(new Evaluators.StackReference(newStack));
currentStack = newStack;
nextOperation = new Operations.Set();
}
}
public void SimplifyExpression()
{
HashSet <RusticStack> discard = null;
foreach (RusticStack stack in stacks)
{
foreach (RusticOperation operation in stack.operations)
{
Evaluators.StackReference reference = null;
bool hasRefParam = operation.parameter != null && (reference = operation.parameter as Evaluators.StackReference) != null;
bool canBeSimplified = hasRefParam && reference.stack.CanBeSimplified;
if (canBeSimplified)
{
operation.parameter = reference.stack.operations[0].parameter;
discard = discard ?? new HashSet <RusticStack>();
discard.Add(reference.stack);
}
}
}
if (discard != null)
{
foreach (RusticStack item in discard)
{
stacks.Remove(item);
}
}
// Simplify the stack register R0
if (stacks.Count > 0 && stacks[0].operations.Count == 1)
{
RusticOperation set;
if ((set = stacks[0].operations[0] as Operations.Set) != null)
{
stacks[0].operations.Clear();
RusticStack stack = ((Evaluators.StackReference)set.parameter).stack;
stacks[0].operations.AddRange(stack.operations);
stacks[0].priority = stack.priority;
stacks.Remove(stack);
}
}
FinalizeExpression();
}
public RusticStack(int id, RusticStack parent, int priority)
{
this.displayId = id;
this.parent = parent;
this.priority = priority;
}