/usr/include/fst/script/replace.h is in libfst-dev 1.5.3+r3-2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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// finite-state transducer library.
#ifndef FST_SCRIPT_REPLACE_H_
#define FST_SCRIPT_REPLACE_H_
#include <utility>
#include <vector>
#include <fst/replace.h>
#include <fst/script/arg-packs.h>
#include <fst/script/fst-class.h>
namespace fst {
namespace script {
struct ReplaceOptions {
int64 root; // Root rule for expansion.
fst::ReplaceLabelType call_label_type; // How to label call arc.
fst::ReplaceLabelType return_label_type; // How to label return arc.
int64 return_label; // Specifies return arc label.
explicit ReplaceOptions(int64 r,
fst::ReplaceLabelType c = fst::REPLACE_LABEL_INPUT,
fst::ReplaceLabelType t = fst::REPLACE_LABEL_NEITHER,
int64 l = 0)
: root(r), call_label_type(c), return_label_type(t), return_label(l) {}
};
using LabelFstClassPair = std::pair<int64, const FstClass *>;
typedef args::Package<const std::vector<LabelFstClassPair> &,
MutableFstClass *, const ReplaceOptions &> ReplaceArgs;
template <class Arc>
void Replace(ReplaceArgs *args) {
using LabelFstPair = std::pair<typename Arc::Label, const Fst<Arc> *>;
// Now that we know the arc type, we construct a vector of
// std::pair<real label, real fst> that the real Replace will use.
const std::vector<LabelFstClassPair> &untyped_pairs = args->arg1;
auto size = untyped_pairs.size();
std::vector<LabelFstPair> typed_pairs(size);
for (auto i = 0; i < size; ++i) {
typed_pairs[i].first = untyped_pairs[i].first; // Converts label.
typed_pairs[i].second = untyped_pairs[i].second->GetFst<Arc>();
}
MutableFst<Arc> *ofst = args->arg2->GetMutableFst<Arc>();
const ReplaceOptions &opts = args->arg3;
ReplaceFstOptions<Arc> typed_opts(opts.root, opts.call_label_type,
opts.return_label_type, opts.return_label);
ReplaceFst<Arc> rfst(typed_pairs, typed_opts);
// Checks for cyclic dependencies before attempting expansino.
if (rfst.CyclicDependencies()) {
FSTERROR() << "Replace: Cyclic dependencies detected; cannot expand";
ofst->SetProperties(kError, kError);
return;
}
typed_opts.gc = true; // Caching options to speed up batch copy.
typed_opts.gc_limit = 0;
*ofst = rfst;
}
void Replace(const std::vector<LabelFstClassPair> &pairs,
MutableFstClass *ofst, const ReplaceOptions &opts);
} // namespace script
} // namespace fst
#endif // FST_SCRIPT_REPLACE_H_
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