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[pf3gnuchains/gcc-fork.git] / libjava / classpath / gnu / javax / swing / text / html / parser / support / low / pattern.java

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
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+/* 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);
+      }
+  }
+}