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// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//
// Copyright 2005-2010 Google, Inc.
// Author: jpr@google.com (Jake Ratkiewicz)
#ifndef FST_SCRIPT_PRUNE_H_
#define FST_SCRIPT_PRUNE_H_
#include <vector>
using std::vector;
#include <fst/script/arg-packs.h>
#include <fst/script/fst-class.h>
#include <fst/script/weight-class.h>
#include <fst/prune.h>
#include <fst/arcfilter.h>
namespace fst {
namespace script {
struct PruneOptions {
WeightClass weight_threshold;
int64 state_threshold;
const vector<WeightClass> *distance;
float delta;
explicit PruneOptions(const WeightClass& w, int64 s,
vector<WeightClass> *d = 0, float e = kDelta)
: weight_threshold(w),
state_threshold(s),
distance(d),
delta(e) {}
private:
PruneOptions(); // disallow
};
// converts a script::PruneOptions into a fst::PruneOptions.
// Notes:
// If the original opts.distance is not NULL, a new distance will be
// created with new; it's the client's responsibility to delete this.
template<class A>
fst::PruneOptions<A, AnyArcFilter<A> > ConvertPruneOptions(
const PruneOptions &opts) {
typedef typename A::Weight Weight;
typedef typename A::StateId StateId;
Weight weight_threshold = *(opts.weight_threshold.GetWeight<Weight>());
StateId state_threshold = opts.state_threshold;
vector<Weight> *distance = 0;
if (opts.distance) {
distance = new vector<Weight>(opts.distance->size());
for (unsigned i = 0; i < opts.distance->size(); ++i) {
(*distance)[i] = *((*opts.distance)[i].GetWeight<Weight>());
}
}
return fst::PruneOptions<A, AnyArcFilter<A> >(
weight_threshold, state_threshold, AnyArcFilter<A>(), distance,
opts.delta);
}
// 1
typedef args::Package<MutableFstClass *, const PruneOptions &> PruneArgs1;
template<class Arc>
void Prune(PruneArgs1 *args) {
MutableFst<Arc> *ofst = args->arg1->GetMutableFst<Arc>();
typedef typename Arc::Weight Weight;
typedef typename Arc::StateId StateId;
fst::PruneOptions<Arc, AnyArcFilter<Arc> > opts =
ConvertPruneOptions<Arc>(args->arg2);
Prune(ofst, opts);
delete opts.distance;
}
// 2
typedef args::Package<const FstClass &, MutableFstClass *,
const PruneOptions &> PruneArgs2;
template<class Arc>
void Prune(PruneArgs2 *args) {
const Fst<Arc>& ifst = *(args->arg1.GetFst<Arc>());
MutableFst<Arc> *ofst = args->arg2->GetMutableFst<Arc>();
fst::PruneOptions<Arc, AnyArcFilter<Arc> > opts =
ConvertPruneOptions<Arc>(args->arg3);
Prune(ifst, ofst, opts);
delete opts.distance;
}
// 3
typedef args::Package<const FstClass &,
MutableFstClass *,
const WeightClass &, int64, float> PruneArgs3;
template<class Arc>
void Prune(PruneArgs3 *args) {
const Fst<Arc>& ifst = *(args->arg1.GetFst<Arc>());
MutableFst<Arc> *ofst = args->arg2->GetMutableFst<Arc>();
typename Arc::Weight w = *(args->arg3.GetWeight<typename Arc::Weight>());
Prune(ifst, ofst, w, args->arg4, args->arg5);
}
// 4
typedef args::Package<MutableFstClass *, const WeightClass&,
int64, float> PruneArgs4;
template<class Arc>
void Prune(PruneArgs4 *args) {
MutableFst<Arc> *fst = args->arg1->GetMutableFst<Arc>();
typename Arc::Weight w = *(args->arg2.GetWeight<typename Arc::Weight>());
Prune(fst, w, args->arg3, args->arg4);
}
// 1
void Prune(MutableFstClass *fst, const PruneOptions &opts);
// 2
void Prune(const FstClass &ifst, MutableFstClass *fst,
const PruneOptions &opts);
// 3
void Prune(const FstClass &ifst, MutableFstClass *ofst,
const WeightClass &weight_threshold,
int64 state_threshold = kNoStateId,
float delta = kDelta);
// 4
void Prune(MutableFstClass *fst, const WeightClass& weight_threshold,
int64 state_threshold, float delta);
} // namespace script
} // namespace fst
#endif // FST_SCRIPT_PRUNE_H_
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