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diff --git a/src/PYPhrase.h b/src/PYPhrase.h
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+++ b/src/PYPhrase.h
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+/* vim:set et ts=4 sts=4:
+ *
+ * ibus-pinyin - The Chinese PinYin engine for IBus
+ *
+ * Copyright (c) 2008-2010 Peng Huang <shawn.p.huang@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, 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., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+#ifndef __PY_PHRASE_H_
+#define __PY_PHRASE_H_
+
+#include <cstring>
+#include "PYTypes.h"
+
+namespace PY {
+
+#define PHRASE_LEN_IN_BYTE (MAX_UTF8_LEN * (MAX_PHRASE_LEN + 1))
+
+struct Phrase {
+    gchar phrase[PHRASE_LEN_IN_BYTE];
+    guint freq;
+    guint user_freq;
+    struct {
+        guint8 sheng;
+        guint8 yun;
+    } pinyin_id[MAX_PHRASE_LEN];
+    guint len;
+
+    void reset (void)
+    {
+        phrase[0] = 0;
+        freq = 0;
+        user_freq = 0;
+        len = 0;
+    }
+
+    gboolean empty (void) const
+    {
+        return len == 0;
+    }
+
+    Phrase & operator += (const Phrase & a)
+    {
+        g_assert (len + a.len <= MAX_PHRASE_LEN);
+        g_strlcat (phrase, a.phrase, sizeof (phrase));
+        std::memcpy (pinyin_id + len, a.pinyin_id, a.len << 1);
+        len += a.len;
+        return *this;
+    }
+
+    operator const gchar * (void) const
+    {
+        return phrase;
+    }
+
+};
+
+};
+
+#endif