add back pinyin_clear_constraint

3 files changed, 23 insertions, 0 deletions

diff --git a/src/libpinyin.ver b/src/libpinyin.ver
index 078ad86..db4cc20 100644
--- a/src/libpinyin.ver
+++ b/src/libpinyin.ver
@@ -29,6 +29,7 @@ LIBPINYIN {
         pinyin_get_full_pinyin_candidates;
         pinyin_choose_candidate;
         pinyin_free_candidates;
+        pinyin_clear_constraint;
         pinyin_lookup_tokens;
         pinyin_train;
         pinyin_reset;
diff --git a/src/pinyin.cpp b/src/pinyin.cpp
index 5cac776..35a7dc8 100644
--- a/src/pinyin.cpp
+++ b/src/pinyin.cpp
@@ -1711,6 +1711,16 @@ bool pinyin_free_candidates(pinyin_instance_t * instance,
     return true;
 }
 
+bool pinyin_clear_constraint(pinyin_instance_t * instance,
+                             size_t offset){
+    pinyin_context_t * & context = instance->m_context;
+
+    bool retval = context->m_pinyin_lookup->clear_constraint
+        (instance->m_constraints, offset);
+
+    return retval;
+}
+
 bool pinyin_lookup_tokens(pinyin_instance_t * instance,
                           const char * phrase, GArray * tokenarray){
     pinyin_context_t * & context = instance->m_context;
diff --git a/src/pinyin.h b/src/pinyin.h
index a28b850..40d9d3d 100644
--- a/src/pinyin.h
+++ b/src/pinyin.h
@@ -446,6 +446,18 @@ bool pinyin_free_candidates(pinyin_instance_t * instance,
                             CandidateVector candidates);
 
 /**
+* pinyin_clear_constraint:
+* @instance: the pinyin instance.
+* @offset: the offset in the pinyin keys.
+* @returns: whether the constraint is cleared.
+*
+* Clear the previous chosen candidate.
+*
+*/
+bool pinyin_clear_constraint(pinyin_instance_t * instance,
+                             size_t offset);
+
+/**
  * pinyin_lookup_tokens:
  * @instance: the pinyin instance.
  * @phrase: the phrase to be looked up.