From 9423a65c6cdd1e9442bf729e0e7dc4eee23cde03 Mon Sep 17 00:00:00 2001
From: Peng Wu <alexepico@gmail.com>
Date: Fri, 29 Oct 2010 15:01:23 +0800
Subject: write get_best_match for phrase lookup

---
 src/lookup/phrase_lookup.cpp | 54 ++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 54 insertions(+)

(limited to 'src/lookup')

diff --git a/src/lookup/phrase_lookup.cpp b/src/lookup/phrase_lookup.cpp
index eae0662..70ab75c 100644
--- a/src/lookup/phrase_lookup.cpp
+++ b/src/lookup/phrase_lookup.cpp
@@ -40,7 +40,61 @@ PhraseLookup::PhraseLookup(PhraseLargeTable * phrase_table,
     m_steps_content = g_ptr_array_new();
 }
 
+bool PhraseLookup::get_best_match(int sentence_length, utf16_t sentence[],
+                                  MatchResults & results){
+    m_sentence_length = sentence_length;
+    m_sentence = sentence;
+    int nstep = keys->len + 1;
 
+    //free m_steps_index
+    for ( size_t i = 0; i < m_steps_index->len; ++i){
+        GHashTable * table = (GHashTable *) g_ptr_array_index(m_steps_index, i);
+        g_hash_table_destroy(table);
+        g_ptr_array_index(m_steps_index, i) = NULL;
+    }
+
+    //free m_steps_content
+    for ( size_t i = 0; m < m_steps_content->len; ++i){
+        GArray * array = (GArray *) g_ptr_array_index(m_steps_content, i);
+        g_array_free(array, TRUE);
+        g_ptr_array_index(m_steps_content, i) = NULL;
+    }
+
+    //add null start step
+    g_ptr_array_set_size(m_steps_index, nstep);
+    g_ptr_array_set_size(m_steps_content, nstep);
+
+    for ( size_t i = 0; i < nstep; ++i ){
+        //initialize m_steps_index
+        g_ptr_array_index(m_steps_index, i) = g_hash_table_new(g_direct_hash, g_direct_equal);
+        //initialize m_steps_content
+        g_ptr_array_index(m_steps_content, i) = g_array_new(FALSE, FALSE, sizeof(lookup_value_t));
+    }
+
+    lookup_key_t initial_key = sentence_start;
+    lookup_value_t initial_value(log(1));
+    initial_value.m_handles[1] = sentence_start;
+    GArray * initial_step_content = (GArray *) g_ptr_array_index(m_steps_content, 0);
+    initial_step_content = g_array_append_val(initial_step_content, initial_value);
+    GHashTable * initial_step_index = (GHashTable *) g_ptr_array_index(m_steps_index, 0);
+    g_hash_table_insert(initial_step_index, GUINT_TO_POINTER(initial_key), GUINT_TO_POINTER(initial_step_content->len - 1));
+
+    for ( size_t i = 0; i < nstep - 1; ++i) {
+        for ( size_t m = i; m < n_step; ++m ){
+            phrase_token_t next_token = NULL;
+            int result = m_phrase_index->search(m - i, sentence + i, next_token);
+            /* found next phrase */
+            if ( result & SEARCH_OK ) {
+                search_bigram(i, next_token),
+                    search_unigram(i, next_token);
+            }
+            /* no longer phrase */
+            if (!(result & SEARCH_CONTINUED))
+                break;
+        }
+    }
+    return final_step(results);
+}
 
 
 
-- 
cgit