static int s_GetTreeHeight(const CQueryParseTree::TNode& node)
{
if (node.IsLeaf()) return 0;
CQueryParseTree::TNode::TNodeList_CI iter = node.SubNodeBegin();
vector<int> heights;
for ( ; iter != node.SubNodeEnd(); ++iter) {
CQueryParseTree::TNode& sub_node = **iter;
heights.push_back(s_GetTreeHeight(sub_node));
}
auto it = max_element(begin(heights), end(heights));
return *it + 1;
}
static int s_CountNodesOfGivenType(const CQueryParseTree::TNode& node, CQueryParseNode::EType type)
{
if (node.IsLeaf()) {
return (node->GetType() == type) ? 1 : 0;
}
CQueryParseTree::TNode::TNodeList_CI iter = node.SubNodeBegin();
int count = 0;
for (; iter != node.SubNodeEnd(); ++iter) {
CQueryParseTree::TNode& sub_node = **iter;
count += s_CountNodesOfGivenType(sub_node, type);
}
return (node->GetType() == type) ? count +1 : count;
}
void CAlignFilter::x_ParseTree_Flatten(CQueryParseTree& tree,
CQueryParseTree::TNode& node)
{
CQueryParseNode::EType type = node->GetType();
switch (type) {
case CQueryParseNode::eAnd:
case CQueryParseNode::eOr:
{{
CQueryParseTree::TNode::TNodeList_I iter;
size_t hoisted = 0;
size_t count_by_complexity[] = {0, 0};
do {
hoisted = 0;
for (iter = node.SubNodeBegin();
iter != node.SubNodeEnd(); ) {
CQueryParseTree::TNode& sub_node = **iter;
++count_by_complexity[x_Complexity(sub_node)];
if (sub_node->GetType() == type) {
/// hoist this node's children
CQueryParseTree::TNode::TNodeList_I sub_iter =
sub_node.SubNodeBegin();
for ( ; sub_iter != sub_node.SubNodeEnd(); ) {
node.AddNode(sub_node.DetachNode(*sub_iter++));
}
node.RemoveNode(iter++);
++hoisted;
} else {
++iter;
}
}
}
while (hoisted != 0);
if (count_by_complexity[CScoreLookup::IScore::eEasy] &&
count_by_complexity[CScoreLookup::IScore::eHard])
{
/// Have both easy and hard subnodes; move hard nodes to end
CQueryParseTree::TNode::TNodeList hard_nodes;
for (iter = node.SubNodeBegin(); iter != node.SubNodeEnd(); )
{
if (x_Complexity(**iter) == CScoreLookup::IScore::eHard) {
hard_nodes.push_back(node.DetachNode(*iter++));
} else {
++iter;
}
}
ITERATE (CQueryParseTree::TNode::TNodeList, it, hard_nodes) {
node.AddNode(*it);
}
}
}}