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// print.h
// 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: riley@google.com (Michael Riley)
//
// \file
// Stand-alone class to print out binary FSTs in the AT&T format,
// helper class for fstprint.cc
#ifndef FST_SCRIPT_PRINT_IMPL_H_
#define FST_SCRIPT_PRINT_IMPL_H_
#include <sstream>
#include <string>
#include <fst/fst.h>
#include <fst/util.h>
DECLARE_string(fst_field_separator);
namespace fst {
// Print a binary Fst in textual format, helper class for fstprint.cc
// WARNING: Stand-alone use of this class not recommended, most code should
// read/write using the binary format which is much more efficient.
template <class A> class FstPrinter {
public:
typedef A Arc;
typedef typename A::StateId StateId;
typedef typename A::Label Label;
typedef typename A::Weight Weight;
FstPrinter(const Fst<A> &fst,
const SymbolTable *isyms,
const SymbolTable *osyms,
const SymbolTable *ssyms,
bool accep,
bool show_weight_one)
: fst_(fst), isyms_(isyms), osyms_(osyms), ssyms_(ssyms),
accep_(accep && fst.Properties(kAcceptor, true)), ostrm_(0),
show_weight_one_(show_weight_one) {}
// Print Fst to an output stream
void Print(ostream *ostrm, const string &dest) {
ostrm_ = ostrm;
dest_ = dest;
StateId start = fst_.Start();
if (start == kNoStateId)
return;
// initial state first
PrintState(start);
for (StateIterator< Fst<A> > siter(fst_);
!siter.Done();
siter.Next()) {
StateId s = siter.Value();
if (s != start)
PrintState(s);
}
}
private:
// Maximum line length in text file.
static const int kLineLen = 8096;
void PrintId(int64 id, const SymbolTable *syms,
const char *name) const {
if (syms) {
string symbol = syms->Find(id);
if (symbol == "") {
FSTERROR() << "FstPrinter: Integer " << id
<< " is not mapped to any textual symbol"
<< ", symbol table = " << syms->Name()
<< ", destination = " << dest_;
symbol = "?";
}
*ostrm_ << symbol;
} else {
*ostrm_ << id;
}
}
void PrintStateId(StateId s) const {
PrintId(s, ssyms_, "state ID");
}
void PrintILabel(Label l) const {
PrintId(l, isyms_, "arc input label");
}
void PrintOLabel(Label l) const {
PrintId(l, osyms_, "arc output label");
}
void PrintState(StateId s) const {
bool output = false;
for (ArcIterator< Fst<A> > aiter(fst_, s);
!aiter.Done();
aiter.Next()) {
Arc arc = aiter.Value();
PrintStateId(s);
*ostrm_ << FLAGS_fst_field_separator[0];
PrintStateId(arc.nextstate);
*ostrm_ << FLAGS_fst_field_separator[0];
PrintILabel(arc.ilabel);
if (!accep_) {
*ostrm_ << FLAGS_fst_field_separator[0];
PrintOLabel(arc.olabel);
}
if (show_weight_one_ || arc.weight != Weight::One())
*ostrm_ << FLAGS_fst_field_separator[0] << arc.weight;
*ostrm_ << "\n";
output = true;
}
Weight final = fst_.Final(s);
if (final != Weight::Zero() || !output) {
PrintStateId(s);
if (show_weight_one_ || final != Weight::One()) {
*ostrm_ << FLAGS_fst_field_separator[0] << final;
}
*ostrm_ << "\n";
}
}
const Fst<A> &fst_;
const SymbolTable *isyms_; // ilabel symbol table
const SymbolTable *osyms_; // olabel symbol table
const SymbolTable *ssyms_; // slabel symbol table
bool accep_; // print as acceptor when possible
ostream *ostrm_; // text FST destination
string dest_; // text FST destination name
bool show_weight_one_; // print weights equal to Weight::One()
DISALLOW_COPY_AND_ASSIGN(FstPrinter);
};
} // namespace fst
#endif // FST_SCRIPT_PRINT_IMPL_H_
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