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tools/openfst-1.6.7/src/script/fst-class.cc
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// See www.openfst.org for extensive documentation on this weighted
// finite-state transducer library.
//
// These classes are only recommended for use in high-level scripting
// applications. Most users should use the lower-level templated versions
// corresponding to these classes.
#include <istream>
#include <fst/log.h>
#include <fst/equal.h>
#include <fst/fst-decl.h>
#include <fst/reverse.h>
#include <fst/union.h>
#include <fst/script/fst-class.h>
#include <fst/script/register.h>
namespace fst {
namespace script {
// Registration.
REGISTER_FST_CLASSES(StdArc);
REGISTER_FST_CLASSES(LogArc);
REGISTER_FST_CLASSES(Log64Arc);
// FstClass methods.
namespace {
template <class F>
F *ReadFst(std::istream &istrm, const string &fname) {
if (!istrm) {
LOG(ERROR) << "ReadFst: Can't open file: " << fname;
return nullptr;
}
FstHeader hdr;
if (!hdr.Read(istrm, fname)) return nullptr;
const FstReadOptions read_options(fname, &hdr);
const auto &arc_type = hdr.ArcType();
static const auto *io_register = IORegistration<F>::Register::GetRegister();
const auto reader = io_register->GetReader(arc_type);
if (!reader) {
LOG(ERROR) << "ReadFst: Unknown arc type: " << arc_type;
return nullptr;
}
return reader(istrm, read_options);
}
} // namespace
FstClass *FstClass::Read(const string &fname) {
if (!fname.empty()) {
std::ifstream istrm(fname, std::ios_base::in | std::ios_base::binary);
return ReadFst<FstClass>(istrm, fname);
} else {
return ReadFst<FstClass>(std::cin, "standard input");
}
}
FstClass *FstClass::Read(std::istream &istrm, const string &source) {
return ReadFst<FstClass>(istrm, source);
}
bool FstClass::WeightTypesMatch(const WeightClass &weight,
const string &op_name) const {
if (WeightType() != weight.Type()) {
FSTERROR() << "FST and weight with non-matching weight types passed to "
<< op_name << ": " << WeightType() << " and " << weight.Type();
return false;
}
return true;
}
// MutableFstClass methods.
MutableFstClass *MutableFstClass::Read(const string &fname, bool convert) {
if (convert == false) {
if (!fname.empty()) {
std::ifstream in(fname, std::ios_base::in | std::ios_base::binary);
return ReadFst<MutableFstClass>(in, fname);
} else {
return ReadFst<MutableFstClass>(std::cin, "standard input");
}
} else { // Converts to VectorFstClass if not mutable.
std::unique_ptr<FstClass> ifst(FstClass::Read(fname));
if (!ifst) return nullptr;
if (ifst->Properties(kMutable, false) == kMutable) {
return static_cast<MutableFstClass *>(ifst.release());
} else {
return new VectorFstClass(*ifst.release());
}
}
}
// VectorFstClass methods.
VectorFstClass *VectorFstClass::Read(const string &fname) {
if (!fname.empty()) {
std::ifstream in(fname, std::ios_base::in | std::ios_base::binary);
return ReadFst<VectorFstClass>(in, fname);
} else {
return ReadFst<VectorFstClass>(std::cin, "standard input");
}
}
IORegistration<VectorFstClass>::Entry GetVFSTRegisterEntry(
const string &arc_type) {
static const auto *io_register =
IORegistration<VectorFstClass>::Register::GetRegister();
return io_register->GetEntry(arc_type);
}
VectorFstClass::VectorFstClass(const string &arc_type)
: MutableFstClass(GetVFSTRegisterEntry(arc_type).creator()) {
if (Properties(kError, true) == kError) {
FSTERROR() << "VectorFstClass: Unknown arc type: " << arc_type;
}
}
VectorFstClass::VectorFstClass(const FstClass &other)
: MutableFstClass(GetVFSTRegisterEntry(other.ArcType()).converter(other)) {}
} // namespace script
} // namespace fst
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