From 0542734a86d0684345fd7b33fb5428fa6669c396 Mon Sep 17 00:00:00 2001
From: Peng Wu <alexepico@gmail.com>
Date: Mon, 1 Nov 2010 16:38:11 +0800
Subject: write final step for phrase lookup

---
 src/lookup/phrase_lookup.cpp | 44 ++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 44 insertions(+)

(limited to 'src/lookup')

diff --git a/src/lookup/phrase_lookup.cpp b/src/lookup/phrase_lookup.cpp
index 1b9c967..e0f530f 100644
--- a/src/lookup/phrase_lookup.cpp
+++ b/src/lookup/phrase_lookup.cpp
@@ -214,6 +214,50 @@ bool PhraseLookup::save_next_step(int next_step_pos, lookup_value_t * cur_value,
     }
 }
 
+bool PhraseLookup::final_step(MatchResults & results ){
+    //reset results
+    g_array_set_size(results, m_steps_content->len);
+    for ( size_t i = 0; i < m_steps_content->len; ++i ){
+        phrase_token_t * token = &g_array_index(results, phrase_token_t, i);
+        *token = null_token;
+    }
+
+    //find max element
+    size_t last_step_pos = m_steps_content->len - 1;
+    GArray * last_step_array =  (GArray *) g_ptr_array_index(m_steps_content, last_step_pos);
+    if ( last_step_array->len == 0 )
+        return false;
+
+    lookup_value_t * max_value = &g_array_index(last_step_array, lookup_value_t, 0);
+    for ( size_t i = 1; i < last_step_array->len; ++i ){
+        lookup_value_t * cur_value = &g_array_index(last_step_array, lookup_value_t, i);
+        if ( cur_value->m_poss > max_value->m_poss )
+            max_value = cur_value;
+    }
+
+    //backtracing
+    while( true ){
+        int cur_step_pos = max_value->m_last_step;
+        if ( -1 = cur_step_pos )
+            break;
+
+        phrase_token_t * token = &g_array_index(results, phrase_token_t, cur_step_pos);
+        *token = max_value->m_handles[1];
+
+        phrase_token_t last_token = max_value->m_handles[0];
+        GHashTable * lookup_step_index = (GHashTable *) g_ptr_array_index(m_steps_index, cur_step_pos);
+        gpointer key, value;
+        gboolean result = g_hash_table_lookup_extended(lookup_step_index, GUINT_TO_POINTER(last_token), &key, &value);
+        if ( !result )
+            return false;
+        GArray * lookup_step_content = (GArray *) g_ptr_array_index(m_steps_content, cur_step_pos);
+        max_value = &g_array_index(lookup_step_content, lookup_value_t, GPOINTER_TO_UINT(value));
+    }
+
+    //no need to reverse the result
+    return true;
+}
+
 bool PhraseLookup::convert_to_utf8(phrase_token_t token, /* out */ char * & phrase){
     m_phrase_index->get_phrase_item(token, m_cache_phrase_item);
     utf16_t buffer[MAX_PHRASE_LENGTH];
-- 
cgit