Xol_convert_wkr.java

/*
XOWA: the XOWA Offline Wiki Application
Copyright (C) 2012-2017 gnosygnu@gmail.com

XOWA is licensed under the terms of the General Public License (GPL) Version 3,
or alternatively under the terms of the Apache License Version 2.0.

You may use XOWA according to either of these licenses as is most appropriate
for your project on a case-by-case basis.

The terms of each license can be found in the source code repository:

GPLv3 License: https://github.com/gnosygnu/xowa/blob/master/LICENSE-GPLv3.txt
Apache License: https://github.com/gnosygnu/xowa/blob/master/LICENSE-APACHE2.txt
*/
package gplx.xowa.langs.vnts.converts; import gplx.*; import gplx.xowa.*; import gplx.xowa.langs.*; import gplx.xowa.langs.vnts.*;
import gplx.core.btries.*; import gplx.core.intls.*;
public class Xol_convert_wkr {
	private final    Btrie_slim_mgr trie = Btrie_slim_mgr.cs(); private final    Btrie_rv trv = new Btrie_rv();
	public Xol_convert_wkr(byte[] key) {this.key = key;}
	public byte[] Key() {return key;} private final    byte[] key;
	public void Add(byte[] src, byte[] trg) {trie.Add_obj(src, trg);}	// called by -{H}-
	public void Del(byte[] src)				{trie.Del(src);}			// called by -{-}-
	public boolean Convert_text(Bry_bfr bfr, byte[] src) {return Convert_text(bfr, src, 0, src.length);}
	public boolean Convert_text(Bry_bfr bfr, byte[] src, int bgn, int end) {
		int pos = bgn;
		boolean matched = false;
		while (pos < end) {
			byte b = src[pos];
			Object o = trie.Match_at_w_b0(trv, b, src, pos, end);
			if (o == null) {										// no match; skip to next char
				int char_len = Utf8_.Len_of_char_by_1st_byte(b);	// NOTE: must increment by char_len, not +1
				if (matched) {
					if (char_len == 1)
						bfr.Add_byte(b);
					else
						bfr.Add_mid(src, pos, pos + char_len);
				}
				pos += char_len;
			}
			else {
				if (!matched) {
					bfr.Add_mid(src, bgn, pos);	// add everything up to pos
					matched = true;
				}
				bfr.Add((byte[])o);
				pos = trv.Pos();
			}
		}
		if (!matched) bfr.Add_mid(src, bgn, end);	// no convert; make sure to add back src, else bfr will be blank
		return matched;
	}
	public void Init(Xol_convert_regy regy, byte[][] vnt_ary) {	// EX: "zh-cn" should add all converts from "zh-hans" "zh-cn" to its wkr
		trie.Clear();
		int len = vnt_ary.length;
		for (int i = 0; i < len; ++i) {
			byte[] key = vnt_ary[i];
			Xol_convert_grp grp = regy.Get_or_null(key); if (grp == null) continue;	// vnt may not have convert mapping; EX: zh-my
			Init_grp(grp);
		}
	}
	private void Init_grp(Xol_convert_grp grp) {
		int len = grp.Len();
		for (int i = 0; i < len; ++i) {
			Xol_convert_itm itm = grp.Get_at(i);
			trie.Add_obj(itm.Src(), itm.Trg());	// NOTE: for dupes, latest value wins
		}
	}
}