/* 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
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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
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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
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independent module, the terms and conditions of the license of that
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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);
}
}
}