1 files changed, 64 insertions, 0 deletions
diff --git a/rst_parser/arc_ff.cc b/rst_parser/arc_ff.cc
new file mode 100644
index 00000000..f9effbda
--- /dev/null
+++ b/rst_parser/arc_ff.cc
@@ -0,0 +1,64 @@
+#include "arc_ff.h"
+
+#include "tdict.h"
+#include "fdict.h"
+#include "sentence_metadata.h"
+
+using namespace std;
+
+ArcFeatureFunction::~ArcFeatureFunction() {}
+
+void ArcFeatureFunction::PrepareForInput(const TaggedSentence&) {}
+
+DistancePenalty::DistancePenalty(const string&) : fidw_(FD::Convert("Distance")), fidr_(FD::Convert("RootDistance")) {}
+
+void DistancePenalty::EdgeFeaturesImpl(const TaggedSentence& sent,
+                                       short h,
+                                       short m,
+                                       SparseVector<weight_t>* features) const {
+  const bool dir = m < h;
+  const bool is_root = (h == -1);
+  int v = m - h;
+  if (v < 0) {
+    v= -1 - int(log(-v) / log(2));
+  } else {
+    v= int(log(v) / log(2));
+  }
+  static map<int, int> lenmap;
+  int& lenfid = lenmap[v];
+  if (!lenfid) {
+    ostringstream os;
+    if (v < 0) os << "LenL" << -v; else os << "LenR" << v;
+    lenfid = FD::Convert(os.str());
+  }
+  features->set_value(lenfid, 1.0);
+  const string& lenstr = FD::Convert(lenfid);
+  if (!is_root) {
+    static int modl = FD::Convert("ModLeft");
+    static int modr = FD::Convert("ModRight");
+    if (dir) features->set_value(modl, 1);
+    else features->set_value(modr, 1);
+  }
+  if (is_root) {
+    ostringstream os;
+    os << "ROOT:" << TD::Convert(sent.pos[m]);
+    features->set_value(FD::Convert(os.str()), 1.0);
+    os << "_" << lenstr;
+    features->set_value(FD::Convert(os.str()), 1.0);
+  } else { // not root
+    ostringstream os;
+    os << "HM:" << TD::Convert(sent.pos[h]) << '_' << TD::Convert(sent.pos[m]);
+    features->set_value(FD::Convert(os.str()), 1.0);
+    os << '_' << dir;
+    features->set_value(FD::Convert(os.str()), 1.0);
+    os << '_' << lenstr;
+    features->set_value(FD::Convert(os.str()), 1.0);
+    ostringstream os2;
+    os2 << "LexHM:" << TD::Convert(sent.words[h]) << '_' << TD::Convert(sent.words[m]);
+    features->set_value(FD::Convert(os2.str()), 1.0);
+    os2 << '_' << dir;
+    features->set_value(FD::Convert(os2.str()), 1.0);
+    os2 << '_' << lenstr;
+    features->set_value(FD::Convert(os2.str()), 1.0);
+  }
+}