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#ifndef LATTICE_H_
#define LATTICE_H_
#include <string>
#include <vector>
#include "wordid.h"
#include "array2d.h"
class Lattice;
struct LatticeTools {
static bool LooksLikePLF(const std::string &line);
static void ConvertTextToLattice(const std::string& text, Lattice* pl);
static void ConvertTextOrPLF(const std::string& text_or_plf, Lattice* pl);
};
struct LatticeArc {
WordID label;
double cost;
int dist2next;
LatticeArc() : label(), cost(), dist2next() {}
LatticeArc(WordID w, double c, int i) : label(w), cost(c), dist2next(i) {}
};
class Lattice : public std::vector<std::vector<LatticeArc> > {
friend void LatticeTools::ConvertTextOrPLF(const std::string& text_or_plf, Lattice* pl);
friend void LatticeTools::ConvertTextToLattice(const std::string& text, Lattice* pl);
public:
Lattice() {}
explicit Lattice(size_t t, const std::vector<LatticeArc>& v = std::vector<LatticeArc>()) :
std::vector<std::vector<LatticeArc>>(t, v) {}
int Distance(int from, int to) const {
if (dist_.empty())
return (to - from);
return dist_(from, to);
}
private:
void ComputeDistances();
Array2D<int> dist_;
};
inline bool IsSentence(const Lattice& in) {
bool res = true;
for (auto& alt : in)
if (alt.size() > 1) { res = false; break; }
return res;
}
#endif
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