From e13055bcabe4fa7d91c79f9938d55147990d1ec4 Mon Sep 17 00:00:00 2001
From: Peng Wu <alexepico@gmail.com>
Date: Wed, 17 Apr 2013 13:58:33 +0800
Subject: write merge_sequence function

---
 utils/segment/mergeseq.cpp | 130 +++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 130 insertions(+)
 create mode 100644 utils/segment/mergeseq.cpp

(limited to 'utils')

diff --git a/utils/segment/mergeseq.cpp b/utils/segment/mergeseq.cpp
new file mode 100644
index 0000000..f7e7cf5
--- /dev/null
+++ b/utils/segment/mergeseq.cpp
@@ -0,0 +1,130 @@
+/* 
+ *  libpinyin
+ *  Library to deal with pinyin.
+ *  
+ *  Copyright (C) 2013 Peng Wu <alexepico@gmail.com>
+ *  
+ *  This program is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation; either version 2 of the License, or
+ *  (at your option) any later version.
+ * 
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ *  GNU General Public License for more details.
+ *  
+ *  You should have received a copy of the GNU General Public License
+ *  along with this program; if not, write to the Free Software
+ *  Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
+ */
+
+#include "pinyin_internal.h"
+
+
+void print_help(){
+    printf("Usage: spseg [--generate-extra-enter] [-o outputfile] [inputfile]\n");
+}
+
+
+/* data structure definition. */
+typedef struct{
+    phrase_token_t m_token;
+    gint m_token_len;
+} TokenInfo;
+
+
+/* GArray of ucs4 characters. */
+typedef GArray * UnicodeCharVector;
+/* GArray of TokenInfo. */
+typedef GArray * TokenInfoVector;
+
+gint calculate_sequence_length(TokenInfoVector * tokens) {
+    gint len = 0;
+
+    size_t i = 0;
+    for (i = 0; i < tokens->len; ++i) {
+        TokenInfo * token_info = &g_array_index(tokens, TokenInfo, i);
+        len += token_info->len;
+    }
+
+    return len;
+}
+
+/* if merge sequence found, merge and output it,
+ *   if not, just output the first token;
+ * pop the first token or sequence.
+ */
+bool merge_sequence(PhraseLargeTable2 * phrase_table,
+                    FacadePhraseIndex * phrase_index,
+                    UnicodeCharVector * unichars,
+                    TokenInfoVector * tokens) {
+    assert(tokens->len > 0);
+
+    bool found = false;
+    TokenInfo * token_info = NULL;
+    gint token_len = 0;
+    phrase_token_t token = null_token;
+
+    const gunichar * ucs4_str = (const gunichar *)unichars->data;
+
+    PhraseTokens tokens;
+    memset(tokens, 0, sizeof(PhraseTokens));
+    phrase_index->prepare_tokens(tokens);
+
+    /* search the merge sequence. */
+    size_t index = tokens->len;
+    gint seq_len = calculate_sequence_length(tokens);
+    while (seq_len > 0) {
+        /* do phrase table search. */
+        phrase_index->clear_tokens(tokens);
+        int retval = phrase_table->search(seq_len, ucs4_str, tokens);
+
+        if (retval & SEARCH_OK) {
+            int num = get_first_token(tokens, token);
+            found = true;
+            break;
+        }
+
+        --index;
+        token_info = &g_array_index(tokens, TokenInfo, index);
+        seq_len -= token_info->m_token_len;
+    }
+
+    phrase_index->destroy_tokens(tokens);
+
+    /* push the merged sequence back. */
+    if (found) {
+        /* pop up the origin sequence. */
+        g_array_remove_range(tokens, 0, index);
+
+        TokenInfo info;
+        info.m_token = token;
+        info.m_token_len = seq_len;
+        g_array_prepend_val(tokens, info);
+    }
+
+    return found;
+}
+
+bool pop_first_token(UnicodeCharVector * unichars,
+                     TokenInfoVector * tokens,
+                     FILE * output) {
+    const gunichar * ucs4_str = (const gunichar *)unichars->data;
+
+    /* pop it. */
+    token_info = &g_array_index(tokens, TokenInfo, 0);
+    token = token_info->m_token;
+    token_len = token_info->m_token_len;
+
+    glong read = 0;
+    gchar * utf8_str = g_ucs4_to_utf8(ucs4_str, token_len, &read, NULL, NULL);
+    assert(read == token_len);
+    fprintf(output, "%d %s\n", token, utf8_str);
+    g_free(utf8_str);
+
+    g_array_remove_range(unichars, 0, token_len);
+    g_array_remove_index(tokens, 0);
+
+    return true;
+}
-- 
cgit