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#include "multitree_iterator.hpp"
namespace terraces {
multitree_iterator::multitree_iterator(const multitree_node* root)
: m_tree(2 * root->num_leaves - 1), m_choices(m_tree.size()),
m_unconstrained_choices(m_tree.size()) {
m_choices[0] = {root};
init_subtree(0);
}
void multitree_iterator::init_subtree(index_t i, index_t single_leaf) {
m_tree[i].lchild() = none;
m_tree[i].rchild() = none;
m_tree[i].taxon() = single_leaf;
}
void multitree_iterator::init_subtree(index_t i, multitree_nodes::two_leaves two_leaves) {
const auto l = i + 1;
const auto r = i + 2;
m_tree[i].lchild() = l;
m_tree[i].rchild() = r;
m_tree[i].taxon() = none;
m_tree[l] = {i, none, none, two_leaves.left_leaf};
m_tree[r] = {i, none, none, two_leaves.right_leaf};
}
void multitree_iterator::init_subtree(index_t i, multitree_nodes::unconstrained unconstrained) {
m_unconstrained_choices[i] = small_bipartition::full_set(unconstrained.num_leaves());
init_subtree_unconstrained(i, unconstrained);
}
bool multitree_iterator::init_subtree_unconstrained(index_t root,
multitree_nodes::unconstrained data) {
auto init_size = m_init_stack.size();
m_init_stack.emplace(root);
while (m_init_stack.size() > init_size) {
auto i = m_init_stack.top();
m_init_stack.pop();
const auto& bip = m_unconstrained_choices[i];
auto& node = m_tree[i];
if (bip.num_leaves() <= 2) {
if (bip.num_leaves() == 1) {
node.lchild() = none;
node.rchild() = none;
node.taxon() = data.begin[bip.leftmost_leaf()];
} else {
node.lchild() = i + 1;
node.rchild() = i + 2;
node.taxon() = none;
m_tree[i + 1] = {i, none, none, data.begin[bip.leftmost_leaf()]};
m_tree[i + 2] = {i, none, none, data.begin[bip.rightmost_leaf()]};
}
} else {
const auto lbip = small_bipartition{bip.left_mask()};
const auto rbip = small_bipartition{bip.right_mask()};
const auto left = i + 1;
const auto right = i + 1 + 2 * lbip.num_leaves() - 1;
node.lchild() = left;
node.rchild() = right;
node.taxon() = none;
m_unconstrained_choices[left] = lbip;
m_unconstrained_choices[right] = rbip;
m_tree[node.lchild()].parent() = i;
m_tree[node.rchild()].parent() = i;
m_init_stack.push(left);
m_init_stack.push(right);
}
}
return true;
}
void multitree_iterator::init_subtree(index_t i, multitree_nodes::inner_node inner) {
const auto left = inner.left;
const auto right = inner.right;
const auto lindex = i + 1;
const auto rindex = lindex + (2 * left->num_leaves - 1);
m_tree[i].lchild() = lindex;
m_tree[i].rchild() = rindex;
m_tree[i].taxon() = none;
m_tree[lindex].parent() = i;
m_tree[rindex].parent() = i;
m_choices[lindex] = {left};
m_choices[rindex] = {right};
m_init_stack.push(lindex);
m_init_stack.push(rindex);
}
bool multitree_iterator::init_subtree(index_t root) {
m_init_stack.push(root);
while (!m_init_stack.empty()) {
auto i = m_init_stack.top();
m_init_stack.pop();
const auto mt_node = m_choices[i].current;
switch (mt_node->type) {
case multitree_node_type::base_single_leaf:
init_subtree(i, mt_node->single_leaf);
break;
case multitree_node_type::base_two_leaves:
init_subtree(i, mt_node->two_leaves);
break;
case multitree_node_type::base_unconstrained:
init_subtree(i, mt_node->unconstrained);
break;
case multitree_node_type::inner_node:
init_subtree(i, mt_node->inner_node);
break;
case multitree_node_type::alternative_array:
assert(false && "Malformed multitree: Nested alternative_arrays");
break;
case multitree_node_type::unexplored:
throw multitree_unexplored_error{};
}
}
return true;
}
bool multitree_iterator::next(index_t root) {
auto node = m_tree[root];
auto left = node.lchild();
auto right = node.rchild();
auto& choice = m_choices[root];
switch (choice.current->type) {
case multitree_node_type::base_single_leaf:
case multitree_node_type::base_two_leaves:
return false;
case multitree_node_type::base_unconstrained:
return next_unconstrained(root, choice.current->unconstrained);
case multitree_node_type::inner_node:
case multitree_node_type::alternative_array:
return next(left) || (next(right) && reset(left)) ||
(choice.has_choices() && choice.next() && init_subtree(root));
case multitree_node_type::unexplored:
throw multitree_unexplored_error{};
default:
assert(false && "Unknown node type in multitree");
return false;
}
}
bool multitree_iterator::next_unconstrained(index_t root, multitree_nodes::unconstrained data) {
auto node = m_tree[root];
auto left = node.lchild();
auto right = node.rchild();
auto& choice = m_unconstrained_choices[root];
if (!choice.has_choices()) {
return false;
}
return next_unconstrained(left, data) ||
(next_unconstrained(right, data) && reset_unconstrained(left, data)) ||
(choice.next() && init_subtree_unconstrained(root, data));
}
bool multitree_iterator::reset(index_t root) {
auto& choice = m_choices[root];
if (choice.has_choices()) {
choice.reset();
}
switch (choice.current->type) {
case multitree_node_type::base_single_leaf:
case multitree_node_type::base_two_leaves:
break;
case multitree_node_type::base_unconstrained:
reset_unconstrained(root, choice.current->unconstrained);
break;
case multitree_node_type::inner_node:
case multitree_node_type::alternative_array:
init_subtree(root);
break;
case multitree_node_type::unexplored:
throw multitree_unexplored_error{};
default:
assert(false && "Unknown node type in multitree");
break;
}
return true;
}
bool multitree_iterator::reset_unconstrained(index_t root, multitree_nodes::unconstrained data) {
auto& choice = m_unconstrained_choices[root];
if (choice.has_choices()) {
choice.reset();
}
init_subtree_unconstrained(root, data);
return true;
}
bool multitree_iterator::next() { return next(0); }
} // namespace terraces
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