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#pragma once
#include "base/assert.hpp"
#include "base/base.hpp"
#include "base/buffer_vector.hpp"
#include "std/unique_ptr.hpp"
namespace trie
{
using TrieChar = uint32_t;
// 95 is a good value for the default baseChar, since both small and capital latin letters
// are less than +/- 32 from it and thus can fit into supershort edge.
// However 0 is used because the first byte is actually language id.
uint32_t constexpr kDefaultChar = 0;
template <typename TValueList>
class Iterator
{
public:
using TValue = typename TValueList::TValue;
struct Edge
{
using TEdgeLabel = buffer_vector<TrieChar, 8>;
TEdgeLabel m_label;
};
buffer_vector<Edge, 8> m_edge;
TValueList m_valueList;
virtual ~Iterator() = default;
virtual unique_ptr<Iterator<TValueList>> Clone() const = 0;
virtual unique_ptr<Iterator<TValueList>> GoToEdge(size_t i) const = 0;
};
template <typename TValueList, typename TF, typename TString>
void ForEachRef(Iterator<TValueList> const & it, TF && f, TString const & s)
{
it.m_valueList.ForEach([&f, &s](typename TValueList::TValue const & value)
{
f(s, value);
});
for (size_t i = 0; i < it.m_edge.size(); ++i)
{
TString s1(s);
s1.insert(s1.end(), it.m_edge[i].m_label.begin(), it.m_edge[i].m_label.end());
auto nextIt = it.GoToEdge(i);
ForEachRef(*nextIt, f, s1);
}
}
} // namespace trie
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