/usr/include/fst/arc.h is in libfst-dev 1.5.3+r3-2.
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// finite-state transducer library.
//
// Commonly used FST arc types.
#ifndef FST_LIB_ARC_H_
#define FST_LIB_ARC_H_
#include <string>
#include <fst/expectation-weight.h>
#include <fst/float-weight.h>
#include <fst/lexicographic-weight.h>
#include <fst/power-weight.h>
#include <fst/product-weight.h>
#include <fst/signed-log-weight.h>
#include <fst/sparse-power-weight.h>
#include <fst/string-weight.h>
namespace fst {
template <class W>
class ArcTpl {
public:
typedef W Weight;
typedef int Label;
typedef int StateId;
ArcTpl(Label i, Label o, const Weight &w, StateId s)
: ilabel(i), olabel(o), weight(w), nextstate(s) {}
ArcTpl() {}
static const string &Type(void) {
static const string type =
(Weight::Type() == "tropical") ? "standard" : Weight::Type();
return type;
}
Label ilabel;
Label olabel;
Weight weight;
StateId nextstate;
};
typedef ArcTpl<TropicalWeight> StdArc;
typedef ArcTpl<LogWeight> LogArc;
typedef ArcTpl<Log64Weight> Log64Arc;
typedef ArcTpl<SignedLogWeight> SignedLogArc;
typedef ArcTpl<SignedLog64Weight> SignedLog64Arc;
typedef ArcTpl<MinMaxWeight> MinMaxArc;
// Arc with integer labels and state Ids and string weights.
template <StringType S = STRING_LEFT>
class StringArc {
public:
typedef int Label;
typedef StringWeight<int, S> Weight;
typedef int StateId;
StringArc(Label i, Label o, Weight w, StateId s)
: ilabel(i), olabel(o), weight(w), nextstate(s) {}
StringArc() {}
static const string &Type() { // Arc type name
static const string type =
S == STRING_LEFT ? "left_standard_string"
: (S == STRING_RIGHT ? "right_standard_string"
: "restricted_standard_string");
return type;
}
Label ilabel; // Transition input label
Label olabel; // Transition output label
Weight weight; // Transition weight
StateId nextstate; // Transition destination state
};
// Arc with label and state Id type the same as template arg and with
// weights over the Gallic semiring w.r.t the output labels and weights of A.
template <class A, GallicType G = GALLIC_LEFT>
struct GallicArc {
typedef A Arc;
typedef typename A::Label Label;
typedef typename A::StateId StateId;
typedef GallicWeight<Label, typename A::Weight, G> Weight;
GallicArc() {}
GallicArc(Label i, Label o, Weight w, StateId s)
: ilabel(i), olabel(o), weight(w), nextstate(s) {}
GallicArc(const A &arc)
: ilabel(arc.ilabel),
olabel(arc.ilabel),
weight(arc.olabel, arc.weight),
nextstate(arc.nextstate) {}
static const string &Type() { // Arc type name
static const string type =
(G == GALLIC_LEFT
? "left_gallic_"
: (G == GALLIC_RIGHT
? "right_gallic_"
: (G == GALLIC_RESTRICT
? "restricted_gallic_"
: (G == GALLIC_MIN ? "min_gallic_" : "gallic_")))) +
A::Type();
return type;
}
Label ilabel; // Transition input label
Label olabel; // Transition output label
Weight weight; // Transition weight
StateId nextstate; // Transition destination state
};
// Arc with the reverse of the weight found in its template arg.
template <class A>
struct ReverseArc {
typedef A Arc;
typedef typename A::Label Label;
typedef typename A::Weight AWeight;
typedef typename AWeight::ReverseWeight Weight;
typedef typename A::StateId StateId;
ReverseArc(Label i, Label o, Weight w, StateId s)
: ilabel(i), olabel(o), weight(w), nextstate(s) {}
ReverseArc() {}
static const string &Type() { // Arc type name
static const string type = "reverse_" + Arc::Type();
return type;
}
Label ilabel; // Transition input label
Label olabel; // Transition output label
Weight weight; // Transition weight
StateId nextstate; // Transition destination state
};
// Arc with integer labels and state Ids and lexicographic weights.
template <class W1, class W2>
struct LexicographicArc {
typedef int Label;
typedef LexicographicWeight<W1, W2> Weight;
typedef int StateId;
LexicographicArc(Label i, Label o, Weight w, StateId s)
: ilabel(i), olabel(o), weight(w), nextstate(s) {}
LexicographicArc() {}
static const string &Type() { // Arc type name
static const string type = Weight::Type();
return type;
}
Label ilabel; // Transition input label
Label olabel; // Transition output label
Weight weight; // Transition weight
StateId nextstate; // Transition destination state
};
// Arc with integer labels and state Ids and product weights.
template <class W1, class W2>
struct ProductArc {
typedef int Label;
typedef ProductWeight<W1, W2> Weight;
typedef int StateId;
ProductArc(Label i, Label o, Weight w, StateId s)
: ilabel(i), olabel(o), weight(w), nextstate(s) {}
ProductArc() {}
static const string &Type() { // Arc type name
static const string type = Weight::Type();
return type;
}
Label ilabel; // Transition input label
Label olabel; // Transition output label
Weight weight; // Transition weight
StateId nextstate; // Transition destination state
};
// Arc with label and state Id type the same as first template arg and with
// weights over the n-th cartesian power of the weight type of the
// template arg.
template <class A, unsigned int n>
struct PowerArc {
typedef A Arc;
typedef typename A::Label Label;
typedef typename A::StateId StateId;
typedef PowerWeight<typename A::Weight, n> Weight;
PowerArc() {}
PowerArc(Label i, Label o, Weight w, StateId s)
: ilabel(i), olabel(o), weight(w), nextstate(s) {}
static const string &Type() { // Arc type name
static string type;
if (type.empty()) {
string power;
Int64ToStr(n, &power);
type = A::Type() + "_^" + power;
}
return type;
}
Label ilabel; // Transition input label
Label olabel; // Transition output label
Weight weight; // Transition weight
StateId nextstate; // Transition destination state
};
// Arc with label and state Id type the same as first template arg and with
// weights over the arbitrary cartesian power of the weight type.
template <class A, class K = int>
struct SparsePowerArc {
typedef A Arc;
typedef typename A::Label Label;
typedef typename A::StateId StateId;
typedef SparsePowerWeight<typename A::Weight, K> Weight;
SparsePowerArc() {}
SparsePowerArc(Label i, Label o, Weight w, StateId s)
: ilabel(i), olabel(o), weight(w), nextstate(s) {}
static const string &Type() { // Arc type name
static string type;
if (type.empty()) {
type = A::Type() + "_^n";
}
if (sizeof(K) != sizeof(uint32)) {
string size;
Int64ToStr(8 * sizeof(K), &size);
type += "_" + size;
}
return type;
}
Label ilabel; // Transition input label
Label olabel; // Transition output label
Weight weight; // Transition weight
StateId nextstate; // Transition destination state
};
// Arc with label and state Id type the same as first template arg and with
// expectation weight over the first template arg weight type and the
// second template arg.
template <class A, class X2>
struct ExpectationArc {
typedef A Arc;
typedef typename A::Label Label;
typedef typename A::StateId StateId;
typedef typename A::Weight X1;
typedef ExpectationWeight<X1, X2> Weight;
ExpectationArc() {}
ExpectationArc(Label i, Label o, Weight w, StateId s)
: ilabel(i), olabel(o), weight(w), nextstate(s) {}
static const string &Type() { // Arc type name
static string type;
if (type.empty()) {
type = "expectation_" + A::Type() + "_" + X2::Type();
}
return type;
}
Label ilabel; // Transition input label
Label olabel; // Transition output label
Weight weight; // Transition weight
StateId nextstate; // Transition destination state
};
} // namespace fst
#endif // FST_LIB_ARC_H_
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