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-/* Pattern.java -- Compiled regular expression ready to be applied.
- 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.RE;
-import gnu.regexp.REException;
-import gnu.regexp.RESyntax;
-
-import java.io.Serializable;
-import java.util.ArrayList;
-
-
-/**
- * Compiled regular expression ready to be applied.
- *
- * @since 1.4
- */
-public final class Pattern implements Serializable
-{
- private static final long serialVersionUID = 5073258162644648461L;
-
- public static final int CANON_EQ = 128;
- public static final int CASE_INSENSITIVE = 2;
- public static final int COMMENTS = 4;
- public static final int DOTALL = 32;
- public static final int MULTILINE = 8;
- public static final int UNICODE_CASE = 64;
- public static final int UNIX_LINES = 1;
-
- private final String regex;
- private final int flags;
-
- private final RE re;
-
- private Pattern (String regex, int flags)
- throws PatternSyntaxException
- {
- this.regex = regex;
- this.flags = flags;
-
- int gnuFlags = 0;
- if ((flags & CASE_INSENSITIVE) != 0)
- gnuFlags |= RE.REG_ICASE;
- if ((flags & MULTILINE) != 0)
- gnuFlags |= RE.REG_MULTILINE;
- if ((flags & DOTALL) != 0)
- gnuFlags |= RE.REG_DOT_NEWLINE;
- // not yet supported:
- // if ((flags & UNICODE_CASE) != 0) gnuFlags =
- // if ((flags & CANON_EQ) != 0) gnuFlags =
-
- RESyntax syntax = RESyntax.RE_SYNTAX_JAVA_1_4;
- if ((flags & UNIX_LINES) != 0)
- {
- // Use a syntax set with \n for linefeeds?
- syntax = new RESyntax(syntax);
- syntax.setLineSeparator("\n");
- }
-
- if ((flags & COMMENTS) != 0)
- {
- // Use a syntax with support for comments?
- }
-
- try
- {
- this.re = new RE(regex, gnuFlags, syntax);
- }
- catch (REException e)
- {
- throw new PatternSyntaxException(e.getMessage(),
- regex, e.getPosition());
- }
- }
-
- // package private accessor method
- RE getRE()
- {
- return re;
- }
-
- /**
- * @param regex The regular expression
- *
- * @exception PatternSyntaxException If the expression's syntax is invalid
- */
- public static Pattern compile (String regex)
- throws PatternSyntaxException
- {
- return compile(regex, 0);
- }
-
- /**
- * @param regex The regular expression
- * @param flags The match flags, a bit mask
- *
- * @exception PatternSyntaxException If the expression's syntax is invalid
- * @exception IllegalArgumentException If bit values other than those
- * corresponding to the defined match flags are set in flags
- */
- public static Pattern compile (String regex, int flags)
- throws PatternSyntaxException
- {
- // FIXME: check which flags are really accepted
- if ((flags & ~0xEF) != 0)
- throw new IllegalArgumentException ();
-
- return new Pattern (regex, flags);
- }
-
- public int flags ()
- {
- return this.flags;
- }
-
- /**
- * @param regex The regular expression
- * @param input The character sequence to be matched
- *
- * @exception PatternSyntaxException If the expression's syntax is invalid
- */
- public static boolean matches (String regex, CharSequence input)
- {
- return compile(regex).matcher(input).matches();
- }
-
- /**
- * @param input The character sequence to be matched
- */
- public Matcher matcher (CharSequence input)
- {
- return new Matcher(this, input);
- }
-
- /**
- * @param input The character sequence to be matched
- */
- public String[] split (CharSequence input)
- {
- return split(input, 0);
- }
-
- /**
- * @param input The character sequence to be matched
- * @param limit The result threshold
- */
- public String[] split (CharSequence input, int limit)
- {
- Matcher matcher = new Matcher(this, input);
- ArrayList list = new ArrayList();
- int empties = 0;
- int count = 0;
- int start = 0;
- int end;
- boolean matched;
-
- while (matched = matcher.find() && (limit <= 0 || count < limit - 1))
- {
- ++count;
- end = matcher.start();
- if (start == end)
- empties++;
- else
- {
- while (empties > 0)
- {
- list.add("");
- empties--;
- }
-
- String text = input.subSequence(start, end).toString();
- list.add(text);
- }
- start = matcher.end();
- }
-
- // We matched nothing.
- if (!matched && count == 0)
- return new String[] { input.toString() };
-
- // Is the last token empty?
- boolean emptyLast = (start == input.length());
-
- // Can/Must we add empties or an extra last token at the end?
- if (list.size() < limit || limit < 0 || (limit == 0 && !emptyLast))
- {
- if (limit > list.size())
- {
- int max = limit - list.size();
- empties = (empties > max) ? max : empties;
- }
- while (empties > 0)
- {
- list.add("");
- empties--;
- }
- }
-
- // last token at end
- if (limit != 0 || (limit == 0 && !emptyLast))
- {
- String t = input.subSequence(start, input.length()).toString();
- if ("".equals(t) && limit == 0)
- ; // Don't add.
- else
- list.add(t);
- }
-
- String[] output = new String [list.size()];
- list.toArray(output);
- return output;
- }
-
- public String pattern ()
- {
- return regex;
- }
-}
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