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Diffstat (limited to 'libjava/classpath/gnu/javax/swing/text/html/parser/support/low/pattern.java')
-rw-r--r-- | libjava/classpath/gnu/javax/swing/text/html/parser/support/low/pattern.java | 105 |
1 files changed, 105 insertions, 0 deletions
diff --git a/libjava/classpath/gnu/javax/swing/text/html/parser/support/low/pattern.java b/libjava/classpath/gnu/javax/swing/text/html/parser/support/low/pattern.java new file mode 100644 index 000000000..0fe03fdbe --- /dev/null +++ b/libjava/classpath/gnu/javax/swing/text/html/parser/support/low/pattern.java @@ -0,0 +1,105 @@ +/* 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 +this exception to your version of the library, but you are not +obligated to do so. If you do not wish to do so, delete this +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); + } + } +} |