From cc9deae9600456b2cda8c605e1487a8d97778b26 Mon Sep 17 00:00:00 2001
From: Matthew Honnibal <honnibal@gmail.com>
Date: Sat, 8 Aug 2015 23:36:18 +0200
Subject: [PATCH] * Add is_valid method to transition_system

---
 spacy/syntax/transition_system.pyx | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/spacy/syntax/transition_system.pyx b/spacy/syntax/transition_system.pyx
index 00395333f..86aef1fbc 100644
--- a/spacy/syntax/transition_system.pyx
+++ b/spacy/syntax/transition_system.pyx
@@ -54,6 +54,10 @@ cdef class TransitionSystem:
     cdef Transition init_transition(self, int clas, int move, int label) except *:
         raise NotImplementedError
 
+    def is_valid(self, StateClass stcls, move_name):
+        action = self.lookup_transition(move_name)
+        return action.is_valid(stcls, action.label)
+
     cdef int set_valid(self, int* is_valid, StateClass stcls) nogil:
         cdef int i
         for i in range(self.n_moves):