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Maven 3 Plugin for processing JavaCC grammar files.
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/* Copyright (c) 2006, Sun Microsystems, Inc.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 *     * Redistributions of source code must retain the above copyright notice,
 *       this list of conditions and the following disclaimer.
 *     * Redistributions in binary form must reproduce the above copyright
 *       notice, this list of conditions and the following disclaimer in the
 *       documentation and/or other materials provided with the distribution.
 *     * Neither the name of the Sun Microsystems, Inc. nor the names of its
 *       contributors may be used to endorse or promote products derived from
 *       this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
 * THE POSSIBILITY OF SUCH DAMAGE.
 */
package org.javacc.jjtree;

import java.io.BufferedReader;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileWriter;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.PrintStream;
import java.io.PrintWriter;
import java.io.Reader;

import org.javacc.parser.JavaCCGlobals;
import org.javacc.parser.Options;

final class IO
{
  private String ifn;
  private String ofn;
  private Reader in;
  private PrintWriter out;
  private final PrintStream msg;
  private final PrintStream err;

  IO ()
  {
    ifn = "";
    msg = System.out;
    err = System.err;
  }

  String getInputFileName ()
  {
    return ifn;
  }

  Reader getIn ()
  {
    return in;
  }

  String getOutputFileName ()
  {
    return ofn;
  }

  PrintWriter getOut ()
  {
    return out;
  }

  PrintStream getMsg ()
  {
    return msg;
  }

  PrintStream getErr ()
  {
    return err;
  }

  void print (final String s)
  {
    out.print (s);
  }

  void println (final String s)
  {
    out.print (s);
    out.println ();
  }

  void println ()
  {
    out.println ();
  }

  void closeAll ()
  {
    if (out != null)
      out.close ();
    if (msg != null)
      msg.flush ();
    if (err != null)
      err.flush ();
  }

  private String create_output_file_name (String i)
  {
    String o = JJTreeOptions.getOutputFile ();

    if (o.equals (""))
    {
      final int s = i.lastIndexOf (File.separatorChar);
      if (s >= 0)
      {
        i = i.substring (s + 1);
      }

      final int di = i.lastIndexOf ('.');
      if (di == -1)
      {
        o = i + ".jj";
      }
      else
      {
        final String suffix = i.substring (di);
        if (suffix.equals (".jj"))
        {
          o = i + ".jj";
        }
        else
        {
          o = i.substring (0, di) + ".jj";
        }
      }
    }

    return o;
  }

  void setInput (final String fn) throws JJTreeIOException
  {
    try
    {
      final File fp = new File (fn);
      if (!fp.exists ())
      {
        throw new JJTreeIOException ("File " + fn + " not found.");
      }
      if (fp.isDirectory ())
      {
        throw new JJTreeIOException (fn + " is a directory. Please use a valid file name.");
      }
      if (org.javacc.parser.JavaCCGlobals.isGeneratedBy ("JJTree", fn))
      {
        throw new JJTreeIOException (fn + " was generated by jjtree.  Cannot run jjtree again.");
      }
      ifn = fp.getPath ();

      in = new BufferedReader (new InputStreamReader (new FileInputStream (ifn), Options.getGrammarEncoding ()));

    }
    catch (final NullPointerException ne)
    { // Should never happen
      throw new JJTreeIOException (ne.toString ());
    }
    catch (final SecurityException se)
    {
      throw new JJTreeIOException ("Security violation while trying to open " + fn);
    }
    catch (final FileNotFoundException e)
    {
      throw new JJTreeIOException ("File " + fn + " not found.");
    }
    catch (final IOException ioe)
    {
      throw new JJTreeIOException (ioe.toString ());
    }
  }

  void setOutput () throws JJTreeIOException
  {
    try
    {
      JavaCCGlobals.createOutputDir (JJTreeOptions.getJJTreeOutputDirectory ());
      final File ofile = new File (JJTreeOptions.getJJTreeOutputDirectory (), create_output_file_name (ifn));
      ofn = ofile.toString ();
      out = new PrintWriter (new FileWriter (ofile));
    }
    catch (final IOException ioe)
    {
      throw new JJTreeIOException ("Can't create output file " + ofn);
    }
  }

}

/* end */