//==============================================================================
// TestParser.java
//==============================================================================

package tribble.net.ftp.shell;


// System imports

import java.io.FileReader;
import java.io.InputStreamReader;
import java.io.IOException;
import java.io.Reader;
import java.io.PrintWriter;

import java.lang.Exception;
import java.lang.String;
import java.lang.System;

import java.text.ParseException;


/*******************************************************************************
* Test driver for class {@link CommandParser}.
*
* <!-- - - - - - - - - - - - - - - - - -->
* @version	$Revision: 1.3 $ $Date: 2007/03/17 03:40:19 $
* @since	API 1.0, 2007-03-14
* @author	David R. Tribble (david&#64;tribble.com).
*	<p>
*	Copyright ©2007 by David R. Tribble, all rights reserved.<br>
*	Permission is granted to any person or entity except those designated by
*	by the United States Department of State as a terrorist, or terrorist
*	government or agency, to use and distribute this source code provided
*	that the original copyright notice remains present and unaltered.
*/

abstract class TestParser
{
// Identification

    /** Revision information. */
    static final String		REV =
        "@(#)tribble/net/ftp/shell/TestParser.java $Revision: 1.3 $ $Date: 2007/03/17 03:40:19 $\n";


// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
// Static variables

    /** Standard output stream. */
    private static PrintWriter	s_stdout =
        new PrintWriter(System.out, true);


// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
// Static methods

    /***************************************************************************
    * Test driver for class {@link CommandParser}.
    *
    * <p>
    * <b>Usage</b>
    * <p>
    * <tt>
    *    java tribble.net.ftp.shell.TestParser [-e] <i>file</i>
    * </tt>
    *
    * <p>
    * Options:
    * <dl>
    *  <dt> <tt>-c</tt>
    *  <dd> Parse the input file as a complete command script.
    *    (This is the default.)
    *
    *  <dt> <tt>-e</tt>
    *  <dd> Parse the input file only as an expression, not as a complete
    *    command script.
    * </dl>
    *
    * <p>
    * The <i>file</i> is a script containing FTP commands.
    *
    * @since	1.1, 2007-03-14
    */

    public static void main(String[] args)
        throws Exception
    {
        String		fname =		null;
        Reader		in =		null;
        boolean		exprOnly =	false;
        int		i;

        // Check args
        for (i = 0;  i < args.length  &&  args[i].charAt(0) == '-';  i++)
        {
            if (args[i].equals("-c"))
                exprOnly = false;
            else if (args[i].equals("-e"))
                exprOnly = true;
            else if (args[i].equals("-"))
                break;
            else
                i = args.length;
        }

        // Check usage
        if (i >= args.length)
        {
            // Display a usage message
            s_stdout.println("Parse an FTP command script file.");
            s_stdout.println();

            s_stdout.println("usage: java " + TestParser.class.getName()
                + " [-e] file");

            System.exit(255);
        }

        try
        {
            CommandParser	parser;
            CommandNode		cmds;

            // Open the command input stream
            fname = args[i];
            if (fname.equals("-"))
                in = new InputStreamReader(System.in);
            else
                in = new FileReader(fname);

            // Parse the command script file
            parser = new CommandParser(in, s_stdout);
            if (exprOnly)
                cmds = parser.parseAnExpr();
            else
                cmds = parser.parse();

            // Print the resulting parse tree
            s_stdout.println("Parse tree:");
            if (cmds != null)
                cmds.print(s_stdout);
            else
                s_stdout.println("<null>");
        }
        catch (ParseException ex)
        {
            s_stdout.println("error:" + ex.getErrorOffset() + ": "
                + ex.getMessage());
            s_stdout.println();
            s_stdout.flush();
            throw (ex);
        }
        finally
        {
            // Clean up
            if (in != null  &&  !fname.equals("-"))
                in.close();
        }
    }
}

// End TestParser.java