| /* pattern.java -- |
| Copyright (C) 2005 Free Software Foundation, Inc. |
| |
| This file is part of GNU Classpath. |
| |
| GNU Classpath 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. |
| |
| GNU Classpath 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 GNU Classpath; see the file COPYING. If not, write to the |
| Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA |
| 02110-1301 USA. |
| |
| Linking this library statically or dynamically with other modules is |
| making a combined work based on this library. Thus, the terms and |
| conditions of the GNU General Public License cover the whole |
| combination. |
| |
| As a special exception, the copyright holders of this library give you |
| permission to link this library with independent modules to produce an |
| executable, regardless of the license terms of these independent |
| modules, and to copy and distribute the resulting executable under |
| terms of your choice, provided that you also meet, for each linked |
| independent module, the terms and conditions of the license of that |
| module. An independent module is a module which is not derived from |
| or based on this library. If you modify this library, you may extend |
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| exception statement from your version. */ |
| |
| |
| package gnu.javax.swing.text.html.parser.support.low; |
| |
| |
| /** |
| * The simple pattern, consisting from the sequence of tokens that |
| * may have the unary modifier '?'. Choices and grouping |
| * are not required here. |
| * @author Audrius Meskauskas, Lithuania (AudriusA@Bioinformatics.org) |
| */ |
| public class pattern |
| { |
| /** |
| * The nodes of this pattern. |
| */ |
| public final node[] nodes; |
| |
| /** |
| * Create a pattern, containing the given list of nodes. |
| * @param a_nodes |
| */ |
| public pattern(node[] a_nodes) |
| { |
| nodes = a_nodes; |
| } |
| |
| /** |
| * Checks if the pattern can match the tokens in this |
| * tokenizer. Does not change the state of tokenizer. |
| * @param stream The tokenizer to read data from |
| * @return True if the pattern sequence matches the |
| * beginning of the tokenizer content. |
| */ |
| public boolean matches(ReaderTokenizer stream) |
| { |
| try |
| { |
| int pt = 0; |
| int pn = 0; |
| Token t; |
| node n; |
| |
| while (pn < nodes.length) |
| { |
| n = nodes [ pn ]; |
| t = stream.getTokenAhead(pt); |
| |
| if (t.kind == n.kind) |
| { |
| pn++; |
| pt++; |
| } |
| else |
| { |
| if (!n.optional) |
| return false; |
| else |
| pn++; |
| } |
| } |
| return true; |
| } |
| catch (Exception ex) |
| { |
| throw new ParseException("Exception", ex); |
| } |
| } |
| } |