From e8451a312b01b0917ffef06afc17f1e8cad5d510 Mon Sep 17 00:00:00 2001
From: Chris Dyer <cdyer@allegro.clab.cs.cmu.edu>
Date: Sat, 18 Oct 2014 22:58:24 -0400
Subject: support serialization of TRule with boost serialization

---
 decoder/trule.h       | 62 +++++++++++++++++++++++++++++++++++++++++++++++++++
 decoder/trule_test.cc | 36 ++++++++++++++++++++++++++++++
 2 files changed, 98 insertions(+)

diff --git a/decoder/trule.h b/decoder/trule.h
index adef7cc7..85842bb5 100644
--- a/decoder/trule.h
+++ b/decoder/trule.h
@@ -11,6 +11,7 @@
 
 #include "sparse_vector.h"
 #include "wordid.h"
+#include "tdict.h"
 
 class TRule;
 typedef boost::shared_ptr<TRule> TRulePtr;
@@ -26,6 +27,7 @@ struct AlignmentPoint {
   short s_;
   short t_;
 };
+
 inline std::ostream& operator<<(std::ostream& os, const AlignmentPoint& p) {
   return os << static_cast<int>(p.s_) << '-' << static_cast<int>(p.t_);
 }
@@ -163,6 +165,66 @@ class TRule {
   // optional, shows internal structure of TSG rules
   boost::shared_ptr<cdec::TreeFragment> tree_structure;
 
+  friend class boost::serialization::access;
+  template<class Archive>
+  void save(Archive & ar, const unsigned int version) const {
+    ar & TD::Convert(-lhs_);
+    unsigned f_size = f_.size();
+    ar & f_size;
+    assert(f_size <= (sizeof(size_t) * 8));
+    size_t f_nt_mask = 0;
+    for (int i = f_.size() - 1; i >= 0; --i) {
+      f_nt_mask <<= 1;
+      f_nt_mask |= (f_[i] <= 0 ? 1 : 0);
+    }
+    ar & f_nt_mask;
+    for (unsigned i = 0; i < f_.size(); ++i)
+      ar & TD::Convert(f_[i] < 0 ? -f_[i] : f_[i]);
+    unsigned e_size = e_.size();
+    ar & e_size;
+    size_t e_nt_mask = 0;
+    assert(e_size <= (sizeof(size_t) * 8));
+    for (int i = e_.size() - 1; i >= 0; --i) {
+      e_nt_mask <<= 1;
+      e_nt_mask |= (e_[i] <= 0 ? 1 : 0);
+    }
+    ar & e_nt_mask;
+    for (unsigned i = 0; i < e_.size(); ++i)
+      if (e_[i] <= 0) ar & e_[i]; else ar & TD::Convert(e_[i]);
+    ar & arity_;
+    ar & scores_;
+  }
+  template<class Archive>
+  void load(Archive & ar, const unsigned int version) {
+    std::string lhs; ar & lhs; lhs_ = -TD::Convert(lhs);
+    unsigned f_size; ar & f_size;
+    f_.resize(f_size);
+    size_t f_nt_mask; ar & f_nt_mask;
+    std::string sym;
+    for (unsigned i = 0; i < f_size; ++i) {
+      bool mask = (f_nt_mask & 1);
+      ar & sym;
+      f_[i] = TD::Convert(sym) * (mask ? -1 : 1);
+      f_nt_mask >>= 1;
+    }
+    unsigned e_size; ar & e_size;
+    e_.resize(e_size);
+    size_t e_nt_mask; ar & e_nt_mask;
+    for (unsigned i = 0; i < e_size; ++i) {
+      bool mask = (e_nt_mask & 1);
+      if (mask) {
+        ar & e_[i];
+      } else {
+        ar & sym;
+        e_[i] = TD::Convert(sym);
+      }
+      e_nt_mask >>= 1;
+    }
+    ar & arity_;
+    ar & scores_;
+  }
+
+  BOOST_SERIALIZATION_SPLIT_MEMBER()
  private:
   TRule(const WordID& src, const WordID& trg) : e_(1, trg), f_(1, src), lhs_(), arity_(), prev_i(), prev_j() {}
 };
diff --git a/decoder/trule_test.cc b/decoder/trule_test.cc
index 0cb7e2e8..d75c2016 100644
--- a/decoder/trule_test.cc
+++ b/decoder/trule_test.cc
@@ -4,6 +4,10 @@
 #include <boost/test/unit_test.hpp>
 #include <boost/test/floating_point_comparison.hpp>
 #include <iostream>
+#include <boost/archive/text_oarchive.hpp>
+#include <boost/archive/text_iarchive.hpp>
+#include <boost/serialization/shared_ptr.hpp>
+#include <sstream>
 #include "tdict.h"
 
 using namespace std;
@@ -53,3 +57,35 @@ BOOST_AUTO_TEST_CASE(TestRuleR) {
   BOOST_CHECK_EQUAL(t6.e_[3], 0);
 }
 
+BOOST_AUTO_TEST_CASE(TestReadWriteHG_Boost) {
+  string str;
+  string t7str;
+  {
+    TRule t7;
+    t7.ReadFromString("[X] ||| den [X,1] sah [X,2] . ||| [2] saw the [1] . ||| Feature1=0.12321 Foo=0.23232 Bar=0.121");
+    cerr << t7.AsString() << endl;
+    ostringstream os;
+    TRulePtr tp1(new TRule("[X] ||| a b c ||| x z y ||| A=1 B=2"));
+    TRulePtr tp2 = tp1;
+    boost::archive::text_oarchive oa(os);
+    oa << t7;
+    oa << tp1;
+    oa << tp2;
+    str = os.str();
+    t7str = t7.AsString();
+  }
+  {
+    istringstream is(str);
+    boost::archive::text_iarchive ia(is);
+    TRule t8;
+    ia >> t8;
+    TRulePtr tp3, tp4;
+    ia >> tp3;
+    ia >> tp4;
+    cerr << t8.AsString() << endl;
+    BOOST_CHECK_EQUAL(t7str, t8.AsString());
+    cerr << tp3->AsString() << endl;
+    cerr << tp4->AsString() << endl;
+  }
+}
+
-- 
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