Subversion Repositories openrisc

/*  gnu/regexp/RETokenStart.java

    Copyright (C) 2006 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.java.util.regex;

import gnu.java.lang.CPStringBuilder;

class RETokenStart extends REToken

{

  private String newline;       // matches after a newline

  private boolean check_java_line_terminators;

  RETokenStart (int subIndex, String newline)

  {

    super (subIndex);

    this.newline = newline;

    this.check_java_line_terminators = false;

  }

  RETokenStart (int subIndex, String newline, boolean b)

  {

    super (subIndex);

    this.newline = newline;

    this.check_java_line_terminators = b;

  }

  @Override

    int getMaximumLength ()

  {

    return 0;

  }

  @Override

    REMatch matchThis (CharIndexed input, REMatch mymatch)

  {

    // charAt(index-n) may be unknown on a Reader/InputStream. FIXME

    // Match after a newline if in multiline mode

    if (check_java_line_terminators)

      {

        char ch = input.charAt (mymatch.index - 1);

        if (ch != CharIndexed.OUT_OF_BOUNDS)

          {

            if (ch == '\n')

              return mymatch;

            if (ch == '\r')

              {

                char ch1 = input.charAt (mymatch.index);

                if (ch1 != '\n')

                  return mymatch;

                return null;

              }

            if (ch == '\u0085')

              return mymatch;   // A next-line character

            if (ch == '\u2028')

              return mymatch;   // A line-separator character

            if (ch == '\u2029')

              return mymatch;   // A paragraph-separator character

          }

      }

    if (newline != null)

      {

        int len = newline.length ();

        if (mymatch.offset >= len)

          {

            boolean found = true;

            char z;

            int i = 0;          // position in REToken.newline

            char ch = input.charAt (mymatch.index - len);

            do

              {

                z = newline.charAt (i);

                if (ch != z)

                  {

                    found = false;

                    break;

                  }

                ++i;

                ch = input.charAt (mymatch.index - len + i);

              }

            while (i < len);

            if (found)

              return mymatch;

          }

      }

    // Don't match at all if REG_NOTBOL is set.

    if ((mymatch.eflags & RE.REG_NOTBOL) > 0)

      return null;

    if ((mymatch.eflags & RE.REG_ANCHORINDEX) > 0)

      return (mymatch.anchor == mymatch.offset) ? mymatch : null;

    else

      return ((mymatch.index == 0) && (mymatch.offset == 0)) ? mymatch : null;

  }

  @Override

    boolean returnsFixedLengthMatches ()

  {

    return true;

  }

  @Override

    int findFixedLengthMatches (CharIndexed input, REMatch mymatch, int max)

  {

    if (matchThis (input, mymatch) != null)

      return max;

    else

      return 0;

  }

  @Override

    void dump (CPStringBuilder os)

  {

    os.append ('^');

  }

}