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// fstdifference.cc
// 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)
// Modified: jpr@google.com (Jake Ratkiewicz) to use FstClass
//
// \file
// Subtracts an unweighted DFA from an FSA.
//
#include <fst/script/difference.h>
#include <fst/script/connect.h>
DEFINE_string(compose_filter, "auto",
"Composition filter, one of: \"alt_sequence\", \"auto\","
" \"match\", \"sequence\"");
DEFINE_bool(connect, true, "Trim output");
int main(int argc, char **argv) {
namespace s = fst::script;
using fst::script::FstClass;
using fst::script::MutableFstClass;
using fst::script::VectorFstClass;
string usage = "Subtracts an unweighted DFA from an FSA.\n\n Usage: ";
usage += argv[0];
usage += " in1.fst in2.fst [out.fst]\n";
std::set_new_handler(FailedNewHandler);
SetFlags(usage.c_str(), &argc, &argv, true);
if (argc < 3 || argc > 4) {
ShowUsage();
return 1;
}
string in1_name = strcmp(argv[1], "-") == 0 ? "" : argv[1];
string in2_name = strcmp(argv[2], "-") == 0 ? "" : argv[2];
string out_name = argc > 3 ? argv[3] : "";
if (in1_name.empty() && in2_name.empty()) {
LOG(ERROR) << argv[0] << ": Can't take both inputs from standard input.";
return 1;
}
FstClass *ifst1 = FstClass::Read(in1_name);
if (!ifst1) return 1;
FstClass *ifst2 = FstClass::Read(in2_name);
if (!ifst2) return 1;
VectorFstClass ofst(ifst1->ArcType());
fst::ComposeFilter cf;
if (FLAGS_compose_filter == "auto") {
cf = fst::AUTO_FILTER;
} else if (FLAGS_compose_filter == "sequence") {
cf = fst::SEQUENCE_FILTER;
} else if (FLAGS_compose_filter == "alt_sequence") {
cf = fst::ALT_SEQUENCE_FILTER;
} else if (FLAGS_compose_filter == "match") {
cf = fst::MATCH_FILTER;
} else {
LOG(ERROR) << argv[0] << ": Bad filter type \""
<< FLAGS_compose_filter << "\"";
return 1;
}
fst::DifferenceOptions opts(FLAGS_connect, cf);
s::Difference(*ifst1, *ifst2, &ofst, opts);
ofst.Write(out_name);
return 0;
}
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