[python] Support for grammars

- Translation rules can now be create programatically
- Grammars = list of translation rules can be used for translation
- Feature expectations on the hypergraph (inside_outside)

1 files changed, 43 insertions, 0 deletions

diff --git a/python/src/grammar.pxd b/python/src/grammar.pxd
new file mode 100644
index 00000000..43806f71
--- /dev/null
+++ b/python/src/grammar.pxd
@@ -0,0 +1,43 @@
+from libcpp.vector cimport vector
+from libcpp.string cimport string
+from utils cimport *
+
+cdef extern from "decoder/trule.h":
+
+    cdef cppclass AlignmentPoint:
+        AlignmentPoint(int s, int t)
+        AlignmentPoint Inverted()
+        short s_
+        short t_
+
+    cdef cppclass TRule:
+        vector[WordID] f_
+        vector[WordID] e_
+        vector[AlignmentPoint] a_
+        FastSparseVector[weight_t] scores_
+        WordID lhs_
+        int arity_
+        bint IsUnary()
+        bint IsGoal()
+        void ComputeArity()
+
+cdef extern from "decoder/grammar.h":
+    cdef cppclass RuleBin "const RuleBin":
+        int GetNumRules()
+        shared_ptr[TRule] GetIthRule(int i)
+        int Arity()
+
+    cdef cppclass GrammarIter "const GrammarIter":
+        RuleBin* GetRules()
+        GrammarIter* Extend(int symbol)
+
+    cdef cppclass Grammar:
+        GrammarIter* GetRoot()
+        bint HasRuleForSpan(int i, int j, int distance)
+        unsigned GetCTFLevels()
+        string GetGrammarName()
+        void SetGrammarName(string)
+
+    cdef cppclass TextGrammar(Grammar):
+        TextGrammar()
+        void AddRule(shared_ptr[TRule]& rule)