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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);
public:
Lattice() : is_sentence_(false) {}
explicit Lattice(size_t t, const std::vector<LatticeArc>& v = std::vector<LatticeArc>()) :
std::vector<std::vector<LatticeArc> >(t, v),
is_sentence_(false) {}
int Distance(int from, int to) const {
if (dist_.empty())
return (to - from);
return dist_(from, to);
}
// TODO this should actually be computed based on the contents
// of the lattice
bool IsSentence() const { return is_sentence_; }
private:
void ComputeDistances();
Array2D<int> dist_;
bool is_sentence_;
};
#endif
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