/usr/include/fst/register.h is in libfst-dev 1.6.3-2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 | // See www.openfst.org for extensive documentation on this weighted
// finite-state transducer library.
//
// Classes for registering derived FST for generic reading.
#ifndef FST_LIB_REGISTER_H_
#define FST_LIB_REGISTER_H_
#include <string>
#include <fst/compat.h>
#include <fst/generic-register.h>
#include <fst/util.h>
#include <fst/types.h>
#include <fst/log.h>
namespace fst {
template <class Arc>
class Fst;
struct FstReadOptions;
// This class represents a single entry in a FstRegister
template <class Arc>
struct FstRegisterEntry {
using Reader = Fst<Arc> *(*)(std::istream &istrm, const FstReadOptions &opts);
using Converter = Fst<Arc> *(*)(const Fst<Arc> &fst);
Reader reader;
Converter converter;
explicit FstRegisterEntry(Reader reader = nullptr,
Converter converter = nullptr)
: reader(reader), converter(converter) {}
};
// This class maintains the correspondence between a string describing
// an FST type, and its reader and converter.
template <class Arc>
class FstRegister
: public GenericRegister<string, FstRegisterEntry<Arc>, FstRegister<Arc>> {
public:
using Reader = typename FstRegisterEntry<Arc>::Reader;
using Converter = typename FstRegisterEntry<Arc>::Converter;
const Reader GetReader(const string &type) const {
return this->GetEntry(type).reader;
}
const Converter GetConverter(const string &type) const {
return this->GetEntry(type).converter;
}
protected:
string ConvertKeyToSoFilename(const string &key) const override {
string legal_type(key);
ConvertToLegalCSymbol(&legal_type);
return legal_type + "-fst.so";
}
};
// This class registers an FST type for generic reading and creating.
// The type must have a default constructor and a copy constructor from
// Fst<Arc>.
template <class FST>
class FstRegisterer : public GenericRegisterer<FstRegister<typename FST::Arc>> {
public:
using Arc = typename FST::Arc;
using Entry = typename FstRegister<Arc>::Entry;
using Reader = typename FstRegister<Arc>::Reader;
FstRegisterer()
: GenericRegisterer<FstRegister<typename FST::Arc>>(FST().Type(),
BuildEntry()) {}
private:
static Entry BuildEntry() {
FST *(*reader)(std::istream & strm, const FstReadOptions &opts) =
&FST::Read;
return Entry(reinterpret_cast<Reader>(reader),
&FstRegisterer<FST>::Convert);
}
static Fst<Arc> *Convert(const Fst<Arc> &fst) { return new FST(fst); }
};
// Convenience macro to generate static FstRegisterer instance.
#define REGISTER_FST(FST, Arc) \
static fst::FstRegisterer<FST<Arc>> FST##_##Arc##_registerer
// Converts an FST to the specified type.
template <class Arc>
Fst<Arc> *Convert(const Fst<Arc> &fst, const string &fst_type) {
auto *reg = FstRegister<Arc>::GetRegister();
const auto converter = reg->GetConverter(fst_type);
if (!converter) {
FSTERROR() << "Fst::Convert: Unknown FST type " << fst_type << " (arc type "
<< Arc::Type() << ")";
return nullptr;
}
return converter(fst);
}
} // namespace fst
#endif // FST_LIB_REGISTER_H_
|