From bdc77848f5eb9ada0f900ec07b471b6a6b72e30a Mon Sep 17 00:00:00 2001
From: Matthew Honnibal <honnibal+gh@gmail.com>
Date: Sun, 10 Mar 2019 13:00:00 +0100
Subject: [PATCH] Add helper method to apply a transition in parser/NER

---
 spacy/syntax/transition_system.pyx | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/spacy/syntax/transition_system.pyx b/spacy/syntax/transition_system.pyx
index 5ec254e04..4cc00828e 100644
--- a/spacy/syntax/transition_system.pyx
+++ b/spacy/syntax/transition_system.pyx
@@ -94,6 +94,13 @@ cdef class TransitionSystem:
                 raise ValueError(Errors.E024)
         return history
 
+    def apply_transition(self, StateClass state, name):
+        if not self.is_valid(state, name):
+            raise ValueError(
+                "Cannot apply transition {name}: invalid for the current state.".format(name=name))
+        action = self.lookup_transition(name)
+        action.do(state.c, action.label)
+
     cdef int initialize_state(self, StateC* state) nogil:
         pass