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#include "ff_spans.h"
#include <sstream>
#include <cassert>
#include "sentence_metadata.h"
#include "lattice.h"
#include "fdict.h"
using namespace std;
SpanFeatures::SpanFeatures(const string& param) :
kS(TD::Convert("S") * -1),
kX(TD::Convert("X") * -1) {}
void SpanFeatures::TraversalFeaturesImpl(const SentenceMetadata& smeta,
const Hypergraph::Edge& edge,
const vector<const void*>& ant_contexts,
SparseVector<double>* features,
SparseVector<double>* estimated_features,
void* context) const {
// char& res = *static_cast<char*>(context);
// res = edge.j_ - edge.i_;
// assert(res >= 0);
assert(edge.j_ < end_span_ids_.size());
assert(edge.j_ >= 0);
features->set_value(end_span_ids_[edge.j_], 1);
if (edge.Arity() == 2) {
const TRule& rule = *edge.rule_;
if (rule.f_[0] == kS && rule.f_[1] == kX) {
// char x_width = *static_cast<const char*>(ant_contexts[1]);
}
}
}
void SpanFeatures::PrepareForInput(const SentenceMetadata& smeta) {
const Lattice& lattice = smeta.GetSourceLattice();
WordID eos = TD::Convert("</s>");
end_span_ids_.resize(lattice.size() + 1);
for (int i = 0; i <= lattice.size(); ++i) {
WordID word = eos;
if (i < lattice.size())
word = lattice[i][0].label; // rather arbitrary for lattices
ostringstream sfid;
sfid << "ES:" << TD::Convert(word);
end_span_ids_[i] = FD::Convert(sfid.str());
}
}
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