1 /*******************************************************************************
2 * Jalview - A Sequence Alignment Editor and Viewer ($$Version-Rel$$)
3 * Copyright (C) $(date) The Jalview Authors
5 * This file is part of Jalview.
7 * Jalview is free software: you can redistribute it and/or
8 * modify it under the terms of the GNU General Public License
9 * as published by the Free Software Foundation, either version 3
10 * of the License, or (at your option) any later version.
12 * Jalview is distributed in the hope that it will be useful, but
13 * WITHOUT ANY WARRANTY; without even the implied warranty
14 * of MERCHANTABILITY or FITNESS FOR A PARTICULAR
15 * PURPOSE. See the GNU General Public License for more details.
17 * You should have received a copy of the GNU General Public License
18 * along with Jalview. If not, see <http://www.gnu.org/licenses/>.
19 * The Jalview Authors are detailed in the 'AUTHORS' file.
20 *******************************************************************************/
22 // This software is now distributed according to
23 // the Lesser Gnu Public License. Please see
24 // http://www.gnu.org/copyleft/lesser.txt for
26 // -- Happy Computing!
28 package com.stevesoft.pat;
30 import java.util.Hashtable;
33 * Provides the ability to match a backreference from within a Pattern.
35 class BackMatch extends Pattern
44 public String toString()
46 return "\\" + (id) + nextString();
49 public int matchInternal(int pos, Pthings p)
52 int i2 = p.marks[id + p.nMarks];
54 if (i1 < 0 || imax < 0 || pos + imax > p.src.length())
58 int ns = p.src.length() - pos;
63 for (int i = 0; i < ns; i++)
65 if (p.src.charAt(i + i1) != p.src.charAt(pos + i))
70 return nextMatch(pos + imax, p);
73 Pattern clone1(Hashtable h)
75 return new BackMatch(id);