1 files changed, 122 insertions, 0 deletions
diff --git a/src/trule.h b/src/trule.h
new file mode 100644
index 00000000..d2b1babe
--- /dev/null
+++ b/src/trule.h
@@ -0,0 +1,122 @@
+#ifndef _RULE_H_
+#define _RULE_H_
+
+#include <algorithm>
+#include <vector>
+#include <cassert>
+#include <boost/shared_ptr.hpp>
+
+#include "sparse_vector.h"
+#include "wordid.h"
+
+class TRule;
+typedef boost::shared_ptr<TRule> TRulePtr;
+struct SpanInfo;
+
+// Translation rule
+class TRule {
+ public:
+  TRule() : lhs_(0), prev_i(-1), prev_j(-1) { }
+  explicit TRule(const std::vector<WordID>& e) : e_(e), lhs_(0), prev_i(-1), prev_j(-1) {}
+  TRule(const std::vector<WordID>& e, const std::vector<WordID>& f, const WordID& lhs) :
+    e_(e), f_(f), lhs_(lhs), prev_i(-1), prev_j(-1) {}
+
+  // deprecated - this will be private soon
+  explicit TRule(const std::string& text, bool strict = false, bool mono = false) {
+    ReadFromString(text, strict, mono);
+  }
+
+  // make a rule from a hiero-like rule table, e.g.
+  //    [X] ||| [X,1] DE [X,2] ||| [X,2] of the [X,1]
+  // if misformatted, returns NULL
+  static TRule* CreateRuleSynchronous(const std::string& rule);
+
+  // make a rule from a phrasetable entry (i.e., one that has no LHS type), e.g:
+  //    el gato ||| the cat ||| Feature_2=0.34
+  static TRule* CreateRulePhrasetable(const std::string& rule);
+
+  // make a rule from a non-synchrnous CFG representation, e.g.:
+  //    [LHS] ||| term1 [NT] term2 [OTHER_NT] [YET_ANOTHER_NT]
+  static TRule* CreateRuleMonolingual(const std::string& rule);
+
+  void ESubstitute(const std::vector<const std::vector<WordID>* >& var_values,
+                   std::vector<WordID>* result) const {
+    int vc = 0;
+    result->clear();
+    for (std::vector<WordID>::const_iterator i = e_.begin(); i != e_.end(); ++i) {
+      const WordID& c = *i;
+      if (c < 1) {
+        ++vc;
+        const std::vector<WordID>& var_value = *var_values[-c];
+        std::copy(var_value.begin(),
+                  var_value.end(),
+                  std::back_inserter(*result));
+      } else {
+        result->push_back(c);
+      }
+    }
+    assert(vc == var_values.size());
+  }
+
+  void FSubstitute(const std::vector<const std::vector<WordID>* >& var_values,
+                   std::vector<WordID>* result) const {
+    int vc = 0;
+    result->clear();
+    for (std::vector<WordID>::const_iterator i = f_.begin(); i != f_.end(); ++i) {
+      const WordID& c = *i;
+      if (c < 1) {
+        const std::vector<WordID>& var_value = *var_values[vc++];
+        std::copy(var_value.begin(),
+                  var_value.end(),
+                  std::back_inserter(*result));
+      } else {
+        result->push_back(c);
+      }
+    }
+    assert(vc == var_values.size());
+  }
+
+  bool ReadFromString(const std::string& line, bool strict = false, bool monolingual = false);
+
+  bool Initialized() const { return e_.size(); }
+
+  std::string AsString(bool verbose = true) const;
+
+  static TRule DummyRule() {
+    TRule res;
+    res.e_.resize(1, 0);
+    return res;
+  }
+
+  const std::vector<WordID>& f() const { return f_; }
+  const std::vector<WordID>& e() const { return e_; }
+
+  int EWords() const { return ELength() - Arity(); }
+  int FWords() const { return FLength() - Arity(); }
+  int FLength() const { return f_.size(); }
+  int ELength() const { return e_.size(); }
+  int Arity() const { return arity_; }
+  bool IsUnary() const { return (Arity() == 1) && (f_.size() == 1); }
+  const SparseVector<double>& GetFeatureValues() const { return scores_; }
+  double Score(int i) const { return scores_[i]; }
+  WordID GetLHS() const { return lhs_; }
+  void ComputeArity();
+
+  // 0 = first variable, -1 = second variable, -2 = third ...
+  std::vector<WordID> e_;
+  // < 0: *-1 = encoding of category of variable
+  std::vector<WordID> f_;
+  WordID lhs_;
+  SparseVector<double> scores_;
+  char arity_;
+  TRulePtr parent_rule_;  // usually NULL, except when doing constrained decoding
+
+  // this is only used when doing synchronous parsing
+  short int prev_i;
+  short int prev_j;
+
+ private:
+  bool SanityCheck() const;
+};
+
+#endif