/usr/include/fst/matcher-fst.h is in libfst-dev 1.5.3+r3-2.
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// finite-state transducer library.
//
// Class to add a matcher to an FST.
#ifndef FST_LIB_MATCHER_FST_H_
#define FST_LIB_MATCHER_FST_H_
#include <memory>
#include <fst/add-on.h>
#include <fst/const-fst.h>
#include <fst/lookahead-matcher.h>
namespace fst {
// WRITABLE MATCHERS - these have the interface of Matchers (see
// matcher.h) and these additional methods:
//
// template <class F>
// class Matcher {
// public:
// typedef ... MatcherData; // Initialization data
// ...
// // Constructor with additional argument for external initialization
// // data; matcher increments its reference count on construction and
// // decrements the reference count, and if 0 deletes, on destruction.
// Matcher(const F &fst, MatchType type, MatcherData *data);
//
// // Returns pointer to initialization data that can be
// // passed to a Matcher constructor.
// MatcherData *GetData() const;
// };
// The matcher initialization data class must have the form:
// class MatcherData {
// public:
// // Required copy constructor.
// MatcherData(const MatcherData &);
// //
// // Required I/O methods.
// static MatcherData *Read(std::istream &istrm, const FstReadOptions& opts);
// bool Write(std::ostream &ostrm, const FstWriteOptions& opts) const;
// };
// Default MatcherFst initializer - does nothing.
template <class M>
class NullMatcherFstInit {
public:
typedef AddOnPair<typename M::MatcherData, typename M::MatcherData> D;
typedef AddOnImpl<typename M::FST, D> Impl;
explicit NullMatcherFstInit(std::shared_ptr<Impl> *impl) {}
};
// Class to add a matcher M to an Fst F. Creates a new Fst of type name N.
// Optional function object I can be used to initialize the Fst.
// Parameter A allows defining the kind of add-on to use.
template <class F, class M, const char *N, class I = NullMatcherFstInit<M>,
class A =
AddOnPair<typename M::MatcherData, typename M::MatcherData>>
class MatcherFst : public ImplToExpandedFst<AddOnImpl<F, A>> {
public:
friend class StateIterator<MatcherFst<F, M, N, I, A>>;
friend class ArcIterator<MatcherFst<F, M, N, I, A>>;
typedef F FST;
typedef M FstMatcher;
typedef typename F::Arc Arc;
typedef typename Arc::StateId StateId;
typedef A D;
typedef AddOnImpl<F, D> Impl;
MatcherFst() : ImplToExpandedFst<Impl>(std::make_shared<Impl>(F(), N)) {}
explicit MatcherFst(const F &fst, std::shared_ptr<D> data = nullptr)
: ImplToExpandedFst<Impl>(data ? CreateImpl(fst, N, data)
: CreateDataAndImpl(fst, N)) {}
explicit MatcherFst(const Fst<Arc> &fst)
: ImplToExpandedFst<Impl>(CreateDataAndImpl(fst, N)) {}
// See Fst<>::Copy() for doc.
MatcherFst(const MatcherFst<F, M, N, I, A> &fst, bool safe = false)
: ImplToExpandedFst<Impl>(fst, safe) {}
// Get a copy of this MatcherFst. See Fst<>::Copy() for further doc.
MatcherFst<F, M, N, I, A> *Copy(bool safe = false) const override {
return new MatcherFst<F, M, N, I, A>(*this, safe);
}
// Read a MatcherFst from an input stream; return nullptr on error
static MatcherFst<F, M, N, I, A> *Read(std::istream &strm,
const FstReadOptions &opts) {
Impl *impl = Impl::Read(strm, opts);
return impl ? new MatcherFst<F, M, N, I, A>(std::shared_ptr<Impl>(impl))
: nullptr;
}
// Read a MatcherFst from a file; return nullptr on error
// Empty filename reads from standard input
static MatcherFst<F, M, N, I, A> *Read(const string &filename) {
Impl *impl = ImplToExpandedFst<Impl>::Read(filename);
return impl ? new MatcherFst<F, M, N, I, A>(std::shared_ptr<Impl>(impl))
: nullptr;
}
bool Write(std::ostream &strm, const FstWriteOptions &opts) const override {
return GetImpl()->Write(strm, opts);
}
bool Write(const string &filename) const override {
return Fst<Arc>::WriteFile(filename);
}
void InitStateIterator(StateIteratorData<Arc> *data) const override {
return GetImpl()->InitStateIterator(data);
}
void InitArcIterator(StateId s, ArcIteratorData<Arc> *data) const override {
return GetImpl()->InitArcIterator(s, data);
}
M *InitMatcher(MatchType match_type) const override {
return new M(GetFst(), match_type, GetSharedData(match_type));
}
const F &GetFst() const { return GetImpl()->GetFst(); }
const D *GetAddOn() const { return GetImpl()->GetAddOn(); }
std::shared_ptr<D> GetSharedAddOn() const {
return GetImpl()->GetSharedAddOn();
}
const typename M::MatcherData *GetData(MatchType match_type) const {
const D *data = GetAddOn();
return match_type == MATCH_INPUT ? data->First() : data->Second();
}
std::shared_ptr<typename M::MatcherData> GetSharedData(
MatchType match_type) const {
const D *data = GetAddOn();
return match_type == MATCH_INPUT ? data->SharedFirst()
: data->SharedSecond();
}
protected:
using ImplToFst<Impl, ExpandedFst<Arc>>::GetImpl;
static std::shared_ptr<Impl> CreateDataAndImpl(const F &fst,
const string &name) {
M imatcher(fst, MATCH_INPUT);
M omatcher(fst, MATCH_OUTPUT);
return CreateImpl(fst, name, std::make_shared<D>(imatcher.GetSharedData(),
omatcher.GetSharedData()));
}
static std::shared_ptr<Impl> CreateDataAndImpl(const Fst<Arc> &fst,
const string &name) {
F ffst(fst);
return CreateDataAndImpl(ffst, name);
}
static std::shared_ptr<Impl> CreateImpl(const F &fst, const string &name,
std::shared_ptr<D> data) {
CHECK(data);
std::shared_ptr<Impl> impl = std::make_shared<Impl>(fst, name);
impl->SetAddOn(data);
I init(&impl);
return impl;
}
explicit MatcherFst(std::shared_ptr<Impl> impl)
: ImplToExpandedFst<Impl>(impl) {}
private:
void operator=(const MatcherFst<F, M, N, I, A> &fst); // disallow
};
// Specialization fo MatcherFst.
template <class F, class M, const char *N, class I>
class StateIterator<MatcherFst<F, M, N, I>> : public StateIterator<F> {
public:
explicit StateIterator(const MatcherFst<F, M, N, I> &fst)
: StateIterator<F>(fst.GetImpl()->GetFst()) {}
};
// Specialization for MatcherFst.
template <class F, class M, const char *N, class I>
class ArcIterator<MatcherFst<F, M, N, I>> : public ArcIterator<F> {
public:
ArcIterator(const MatcherFst<F, M, N, I> &fst, typename F::Arc::StateId s)
: ArcIterator<F>(fst.GetImpl()->GetFst(), s) {}
};
// Specialization for MatcherFst
template <class F, class M, const char *N, class I>
class Matcher<MatcherFst<F, M, N, I>> {
public:
typedef MatcherFst<F, M, N, I> FST;
typedef typename F::Arc Arc;
typedef typename Arc::StateId StateId;
typedef typename Arc::Label Label;
Matcher(const FST &fst, MatchType match_type) {
matcher_ = fst.InitMatcher(match_type);
}
Matcher(const Matcher<FST> &matcher) { matcher_ = matcher.matcher_->Copy(); }
~Matcher() { delete matcher_; }
Matcher<FST> *Copy() const { return new Matcher<FST>(*this); }
MatchType Type(bool test) const { return matcher_->Type(test); }
void SetState(StateId s) { matcher_->SetState(s); }
bool Find(Label label) { return matcher_->Find(label); }
bool Done() const { return matcher_->Done(); }
const Arc &Value() const { return matcher_->Value(); }
void Next() { matcher_->Next(); }
uint64 Properties(uint64 props) const { return matcher_->Properties(props); }
uint32 Flags() const { return matcher_->Flags(); }
private:
M *matcher_;
void operator=(const Matcher<Arc> &); // disallow
};
// Specialization for MatcherFst
template <class F, class M, const char *N, class I>
class LookAheadMatcher<MatcherFst<F, M, N, I>> {
public:
typedef MatcherFst<F, M, N, I> FST;
typedef typename F::Arc Arc;
typedef typename Arc::StateId StateId;
typedef typename Arc::Label Label;
typedef typename Arc::Weight Weight;
LookAheadMatcher(const FST &fst, MatchType match_type) {
matcher_ = fst.InitMatcher(match_type);
}
LookAheadMatcher(const LookAheadMatcher<FST> &matcher, bool safe = false) {
matcher_ = matcher.matcher_->Copy(safe);
}
~LookAheadMatcher() { delete matcher_; }
// General matcher methods
LookAheadMatcher<FST> *Copy(bool safe = false) const {
return new LookAheadMatcher<FST>(*this, safe);
}
MatchType Type(bool test) const { return matcher_->Type(test); }
void SetState(StateId s) { matcher_->SetState(s); }
bool Find(Label label) { return matcher_->Find(label); }
bool Done() const { return matcher_->Done(); }
const Arc &Value() const { return matcher_->Value(); }
void Next() { matcher_->Next(); }
const FST &GetFst() const { return matcher_->GetFst(); }
uint64 Properties(uint64 props) const { return matcher_->Properties(props); }
uint32 Flags() const { return matcher_->Flags(); }
// Look-ahead methods
bool LookAheadLabel(Label label) const {
return matcher_->LookAheadLabel(label);
}
bool LookAheadFst(const Fst<Arc> &fst, StateId s) {
return matcher_->LookAheadFst(fst, s);
}
Weight LookAheadWeight() const { return matcher_->LookAheadWeight(); }
bool LookAheadPrefix(Arc *arc) const {
return matcher_->LookAheadPrefix(arc);
}
void InitLookAheadFst(const Fst<Arc> &fst, bool copy = false) {
matcher_->InitLookAheadFst(fst, copy);
}
private:
M *matcher_;
void operator=(const LookAheadMatcher<FST> &); // disallow
};
//
// Useful aliases when using StdArc and LogArc.
//
// Arc look-ahead matchers
extern const char arc_lookahead_fst_type[];
typedef MatcherFst<ConstFst<StdArc>,
ArcLookAheadMatcher<SortedMatcher<ConstFst<StdArc>> >,
arc_lookahead_fst_type> StdArcLookAheadFst;
typedef MatcherFst<ConstFst<LogArc>,
ArcLookAheadMatcher<SortedMatcher<ConstFst<LogArc>> >,
arc_lookahead_fst_type> LogArcLookAheadFst;
// Label look-ahead matchers
extern const char ilabel_lookahead_fst_type[];
extern const char olabel_lookahead_fst_type[];
static const uint32 ilabel_lookahead_flags =
kInputLookAheadMatcher | kLookAheadWeight | kLookAheadPrefix |
kLookAheadEpsilons | kLookAheadNonEpsilonPrefix;
static const uint32 olabel_lookahead_flags =
kOutputLookAheadMatcher | kLookAheadWeight | kLookAheadPrefix |
kLookAheadEpsilons | kLookAheadNonEpsilonPrefix;
typedef MatcherFst<
ConstFst<StdArc>,
LabelLookAheadMatcher<SortedMatcher<ConstFst<StdArc>>,
ilabel_lookahead_flags, FastLogAccumulator<StdArc>>,
ilabel_lookahead_fst_type,
LabelLookAheadRelabeler<StdArc>> StdILabelLookAheadFst;
typedef MatcherFst<
ConstFst<LogArc>,
LabelLookAheadMatcher<SortedMatcher<ConstFst<LogArc>>,
ilabel_lookahead_flags, FastLogAccumulator<LogArc>>,
ilabel_lookahead_fst_type,
LabelLookAheadRelabeler<LogArc>> LogILabelLookAheadFst;
typedef MatcherFst<
ConstFst<StdArc>,
LabelLookAheadMatcher<SortedMatcher<ConstFst<StdArc>>,
olabel_lookahead_flags, FastLogAccumulator<StdArc>>,
olabel_lookahead_fst_type,
LabelLookAheadRelabeler<StdArc>> StdOLabelLookAheadFst;
typedef MatcherFst<
ConstFst<LogArc>,
LabelLookAheadMatcher<SortedMatcher<ConstFst<LogArc>>,
olabel_lookahead_flags, FastLogAccumulator<LogArc>>,
olabel_lookahead_fst_type,
LabelLookAheadRelabeler<LogArc>> LogOLabelLookAheadFst;
} // namespace fst
#endif // FST_LIB_MATCHER_FST_H_
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