void evaluate_stack(std::stack<stack_item*>* stack)
{
if (stack->size() <= 1)
return;
stack_item* top_item = stack->top();
stack->pop();
if (top_item->type == NODE)
{
assert(stack->top()->type == FUNC);
if (stack->top()->function == '|')
{
stack->pop();
collapse_stack_strings(stack);
evaluate_stack(stack);
Node* newNode = new Node(ALTER);
newNode->left = stack->top()->node;
newNode->right = top_item->node;
stack->top()->node = newNode;
return;
}
else {
evaluate_stack(stack);
Node* newNode = new Node(CONCAT);
newNode->left = stack->top()->node;
newNode->right = top_item->node;
stack->top()->node = newNode;
return;
}
}
else if (top_item->type == FUNC)
{
assert(stack->top()->type == NODE);
if (top_item->function == '*')
{
Node* newNode = new Node(STAR);
newNode->left = stack->top()->node;
stack->top()->node = newNode;
return;
}
else if (top_item->function == '+')
{
Node* newNode = new Node(PLUS);
newNode->left = stack->top()->node;
stack->top()->node = newNode;
return;
}
else if (top_item->function == '?')
{
Node* newNode = new Node(QUESTION);
newNode->left = stack->top()->node;
stack->top()->node = newNode;
return;
}
}
}
void evaluate_stack_brackets(std::stack<stack_item*>* stack)
{
std::stack<stack_item*> stack1;
while (stack->top()->function != '[')
{
stack1.push(stack->top());
stack->pop();
assert(!stack->empty());
}
std::stack<stack_item*> itemStack;
while (!stack1.empty())
{
itemStack.push(stack1.top());
stack1.pop();
}
std::stack<char> charStack;
while (!itemStack.empty())
{
assert(itemStack.top()->type != FUNC || itemStack.top()->function == '-');
if (itemStack.top()->type == NODE)
{
assert(itemStack.top()->node->type == CHR);
charStack.push(itemStack.top()->node->data);
itemStack.pop();
}
else if (itemStack.top()->function == '-')
{
itemStack.pop();
assert(itemStack.top()->node->type == CHR);
char firstChar = itemStack.top()->node->data;
itemStack.pop();
char lastChar = charStack.top();
charStack.pop();
int a = std::min((int)firstChar, (int)lastChar);
int b = std::max((int)firstChar, (int)lastChar);
for (int i = a; i <= b; ++i)
{
charStack.push((char)i);
}
}
}
stack->pop();
while (!charStack.empty())
{
stack->push(new stack_item(NODE, charStack.top()));
stack->push(new stack_item(FUNC, '|'));
charStack.pop();
}
stack->pop(); //Remove trailing '|'
evaluate_stack(stack);
}
bool resolve_stack_from_parser(const object& operation_tree, bool resolve_entire_stack)
{
if(operation_tree.type == OPERATION_TREE)
{
Array* tree;
// Copy for normal calls, DON'T copy if this is coming from the parser. We know this because the parser resolves the entire stack.
// We don't copy the calls from the parser because it passes off ownership of the objects and doesn't free them itself.
if(!resolve_entire_stack)
{
// object copy_tree = mem_copy(operation_tree);
// object copy_tree = operation_tree;
// tree = copy_tree.data.array;
tree = operation_tree.data.array;
}
else
{
tree = operation_tree.data.array;
}
if(operation_tree.data.array->size() > 1)
{
std::reverse_copy(tree->begin(), tree->end(), std::inserter(optic_stack, optic_stack.end()));
}
else if(operation_tree.data.array->size() == 1)
{
optic_stack.push_back(tree->at(0));
}
else
{
out() << "Error: No operations to put on the stack." << std::endl;
correct_parsing = false;
}
// Free the Array* we created but not the actual contents because they will get freed on the stack
// shallow_mem_free_array(tree, OPERATION_TREE);
if(resolve_entire_stack)
evaluate_stack();
else
evaluate_top();
}
}
void evaluate_stack_paren(std::stack<stack_item*>* stack)
{
std::stack<stack_item*> stack1;
while (stack->top()->type == CHR || stack->top()->function != '(')
{
stack1.push(stack->top());
stack->pop();
assert(!stack->empty());
}
std::stack<stack_item*> itemStack;
while (!stack1.empty())
{
itemStack.push(stack1.top());
stack1.pop();
}
while (itemStack.size() > 1)
{
evaluate_stack(&itemStack);
}
stack->pop();
stack->push(itemStack.top());
}
Tree* build_tree_from_expression(std::string str)
{
int i = 0;
std::stack<stack_item*> treeStack;
int paren_depth = 0;
int bracket_depth = 0;
int brace_depth = 0;
while (i < str.length())
{
switch (str[i])
{
case '\\':
{
i++;
assert(i < str.length());
if (str[i] - '0' >= 0 && str[i] - '0' <= 9)
{
treeStack.push(new stack_item(FUNC, str[i]));
}
else {
treeStack.push(new stack_item(NODE, control_character(str[i])));
}
break;
}
case '(':
{
paren_depth++;
treeStack.push(new stack_item(FUNC, str[i]));
break;
}
case ')':
{
assert(paren_depth > 0);
collapse_stack_strings(&treeStack);
evaluate_stack_paren(&treeStack);
paren_depth--;
break;
}
case '[':
{
bracket_depth++;
treeStack.push(new stack_item(FUNC, str[i]));
break;
}
case ']':
{
assert(bracket_depth > 0);
evaluate_stack_brackets(&treeStack);
collapse_stack_strings(&treeStack);
bracket_depth--;
break;
}
case '{':
{
brace_depth++;
treeStack.push(new stack_item(FUNC, str[i]));
break;
}
case '}':
{
assert(brace_depth > 0);
evaluate_stack_braces(&treeStack);
collapse_stack_strings(&treeStack);
brace_depth--;
break;
}
case '^':
{
treeStack.push(new stack_item(FUNC, str[i]));
break;
}
case '$':
{
treeStack.push(new stack_item(FUNC, str[i]));
break;
}
case '.':
{
treeStack.push(new stack_item(FUNC, '['));
treeStack.push(new stack_item(NODE, (char)MIN_CHAR));
treeStack.push(new stack_item(FUNC, '-'));
treeStack.push(new stack_item(NODE, (char)MAX_CHAR));
evaluate_stack_brackets(&treeStack);
collapse_stack_strings(&treeStack);
//treeStack.push(new stack_item(FUNC, str[i]));
break;
}
case '*':
{
treeStack.push(new stack_item(FUNC, str[i]));
break;
}
case '+':
{
treeStack.push(new stack_item(FUNC, str[i]));
break;
}
case '?':
{
treeStack.push(new stack_item(FUNC, str[i]));
break;
}
case '|':
{
treeStack.push(new stack_item(FUNC, str[i]));
break;
}
case '-':
{
if (bracket_depth > 0)
treeStack.push(new stack_item(FUNC, str[i]));
else
treeStack.push(new stack_item(NODE, str[i]));
break;
}
default:
{
if (brace_depth > 0)
{
treeStack.push(new stack_item(FUNC, str[i]));
assert(str[i] == ',' || (str[i] - '0' >= 0 && str[i] - '0' <= 9));
}else
treeStack.push(new stack_item(NODE, str[i]));
break;
}
}
i++;
}
collapse_stack_strings(&treeStack);
evaluate_stack(&treeStack);
return new Tree(treeStack.top()->node);
}
