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#ifndef _FDICT_H_
#define _FDICT_H_
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <iostream>
#include <string>
#include <vector>
#include "dict.h"
#ifdef HAVE_CMPH
#include "perfect_hash.h"
#include <sstream>
#endif
struct FD {
// once the FD is frozen, new features not already in the
// dictionary will return 0
static void Freeze() {
frozen_ = true;
}
static bool UsingPerfectHashFunction() {
#ifdef HAVE_CMPH
return hash_;
#else
return false;
#endif
}
static void EnableHash(const std::string& cmph_file) {
#ifdef HAVE_CMPH
assert(dict_.max() == 0); // dictionary must not have
// been added to
hash_ = new PerfectHashFunction(cmph_file);
#else
(void) cmph_file;
#endif
}
static inline int NumFeats() {
#ifdef HAVE_CMPH
if (hash_) return hash_->number_of_keys();
#endif
return dict_.max() + 1;
}
static inline WordID Convert(const std::string& s) {
#ifdef HAVE_CMPH
if (hash_) return (*hash_)(s);
#endif
return dict_.Convert(s, frozen_);
}
static inline const std::string& Convert(const WordID& w) {
#ifdef HAVE_CMPH
if (hash_) {
static std::string tls;
std::ostringstream os;
os << w;
tls = os.str();
return tls;
}
#endif
return dict_.Convert(w);
}
static std::string Convert(WordID const *i,WordID const* e);
static std::string Convert(std::vector<WordID> const& v);
// Escape any string to a form that can be used as the name
// of a weight in a weights file
static std::string Escape(const std::string& s);
static Dict dict_;
private:
static bool frozen_;
#ifdef HAVE_CMPH
static PerfectHashFunction* hash_;
#endif
};
#endif
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