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git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@102074 138bc75d-0d04-0410-961f-82ee72b054a4

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diff --git a/libjava/classpath/java/util/regex/Matcher.java b/libjava/classpath/java/util/regex/Matcher.java
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+/* Matcher.java -- Instance of a regular expression applied to a char sequence.
+   Copyright (C) 2002, 2004 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 java.util.regex;
+
+import gnu.regexp.REMatch;
+
+/**
+ * Instance of a regular expression applied to a char sequence.
+ *
+ * @since 1.4
+ */
+public final class Matcher
+{
+  private Pattern pattern;
+  private CharSequence input;
+  private int position;
+  private int appendPosition;
+  private REMatch match;
+
+  Matcher(Pattern pattern, CharSequence input)
+  {
+    this.pattern = pattern;
+    this.input = input;
+  }
+  
+  /**
+   * @param sb The target string buffer
+   * @param replacement The replacement string
+   *
+   * @exception IllegalStateException If no match has yet been attempted,
+   * or if the previous match operation failed
+   * @exception IndexOutOfBoundsException If the replacement string refers
+   * to a capturing group that does not exist in the pattern
+   */
+  public Matcher appendReplacement (StringBuffer sb, String replacement)
+    throws IllegalStateException
+  {
+    assertMatchOp();
+    sb.append(input.subSequence(appendPosition,
+				match.getStartIndex()).toString());
+    sb.append(match.substituteInto(replacement));
+    appendPosition = match.getEndIndex();
+    return this;
+  }
+
+  /**
+   * @param sb The target string buffer
+   */
+  public StringBuffer appendTail (StringBuffer sb)
+  {
+    sb.append(input.subSequence(appendPosition, input.length()).toString());
+    return sb;
+  }
+ 
+  /**
+   * @exception IllegalStateException If no match has yet been attempted,
+   * or if the previous match operation failed
+   */
+  public int end ()
+    throws IllegalStateException
+  {
+    assertMatchOp();
+    return match.getEndIndex();
+  }
+  
+  /**
+   * @param group The index of a capturing group in this matcher's pattern
+   *
+   * @exception IllegalStateException If no match has yet been attempted,
+   * or if the previous match operation failed
+   * @exception IndexOutOfBoundsException If the replacement string refers
+   * to a capturing group that does not exist in the pattern
+   */
+  public int end (int group)
+    throws IllegalStateException
+  {
+    assertMatchOp();
+    return match.getEndIndex(group);
+  }
+ 
+  public boolean find ()
+  {
+    boolean first = (match == null);
+    match = pattern.getRE().getMatch(input, position);
+    if (match != null)
+      {
+	int endIndex = match.getEndIndex();
+	// Are we stuck at the same position?
+	if (!first && endIndex == position)
+	  {
+	    match = null;
+	    // Not at the end of the input yet?
+	    if (position < input.length() - 1)
+	      {
+		position++;
+		return find(position);
+	      }
+	    else
+	      return false;
+	  }
+	position = endIndex;
+	return true;
+      }
+    return false;
+  } 
+
+  /**
+   * @param start The index to start the new pattern matching
+   *
+   * @exception IndexOutOfBoundsException If the replacement string refers
+   * to a capturing group that does not exist in the pattern
+   */
+  public boolean find (int start)
+  {
+    match = pattern.getRE().getMatch(input, start);
+    if (match != null)
+      {
+	position = match.getEndIndex();
+	return true;
+      }
+    return false;
+  }
+ 
+  /**
+   * @exception IllegalStateException If no match has yet been attempted,
+   * or if the previous match operation failed
+   */
+  public String group ()
+  {
+    assertMatchOp();
+    return match.toString();
+  }
+  
+  /**
+   * @param group The index of a capturing group in this matcher's pattern
+   *
+   * @exception IllegalStateException If no match has yet been attempted,
+   * or if the previous match operation failed
+   * @exception IndexOutOfBoundsException If the replacement string refers
+   * to a capturing group that does not exist in the pattern
+   */
+  public String group (int group)
+    throws IllegalStateException
+  {
+    assertMatchOp();
+    return match.toString(group);
+  }
+
+  /**
+   * @param replacement The replacement string
+   */
+  public String replaceFirst (String replacement)
+  {
+    reset();
+    // Semantics might not quite match
+    return pattern.getRE().substitute(input, replacement, position);
+  }
+
+  /**
+   * @param replacement The replacement string
+   */
+  public String replaceAll (String replacement)
+  {
+    reset();
+    return pattern.getRE().substituteAll(input, replacement, position);
+  }
+  
+  public int groupCount ()
+  {
+    return pattern.getRE().getNumSubs();
+  }
+ 
+  public boolean lookingAt ()
+  {
+    match = pattern.getRE().getMatch(input, 0);
+    if (match != null)
+      {
+	if (match.getStartIndex() == 0)
+	  {
+	    position = match.getEndIndex();
+	    return true;
+	  }
+	match = null;
+      }
+    return false;
+  }
+  
+  /**
+   * Attempts to match the entire input sequence against the pattern. 
+   *
+   * If the match succeeds then more information can be obtained via the
+   * start, end, and group methods.
+   *
+   * @see #start
+   * @see #end
+   * @see #group
+   */
+  public boolean matches ()
+  {
+    if (lookingAt())
+      {
+	if (position == input.length())
+	  return true;
+	match = null;
+      }
+    return false;
+  }
+  
+  /**
+   * Returns the Pattern that is interpreted by this Matcher
+   */
+  public Pattern pattern ()
+  {
+    return pattern;
+  }
+  
+  public Matcher reset ()
+  {
+    position = 0;
+    match = null;
+    return this;
+  }
+  
+  /**
+   * @param input The new input character sequence
+   */
+  public Matcher reset (CharSequence input)
+  {
+    this.input = input;
+    return reset();
+  }
+  
+  /**
+   * @param group The index of a capturing group in this matcher's pattern
+   *
+   * @exception IllegalStateException If no match has yet been attempted,
+   * or if the previous match operation failed
+   */
+  public int start ()
+    throws IllegalStateException
+  {
+    assertMatchOp();
+    return match.getStartIndex();
+  }
+
+  /**
+   * @param group The index of a capturing group in this matcher's pattern
+   *
+   * @exception IllegalStateException If no match has yet been attempted,
+   * or if the previous match operation failed
+   * @exception IndexOutOfBoundsException If the replacement string refers
+   * to a capturing group that does not exist in the pattern
+   */
+  public int start (int group)
+    throws IllegalStateException
+  {
+    assertMatchOp();
+    return match.getStartIndex(group);
+  }
+
+  private void assertMatchOp()
+  {
+    if (match == null) throw new IllegalStateException();
+  }
+}