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 * may not use this file except in compliance with the License.  You can
 * obtain a copy of the License at
 * https://glassfish.dev.java.net/public/CDDL+GPL_1_1.html
 * or packager/legal/LICENSE.txt.  See the License for the specific
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/*
 * $Id: JavaCupRedirect.java,v 1.10 2010-11-01 04:34:33 joehw Exp $
 */
package com.sun.org.apache.xalan.internal.xsltc.util;

import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.InputStream;

/**
 * Utility class to redirect input to JavaCup program.
 *
 * Usage-command line: 
 * java com.sun.org.apache.xalan.internal.xsltc.utils.JavaCupRedirect [args] -stdin filename.ext
 *
 * @author Morten Jorgensen
 * @version $Id: JavaCupRedirect.java,v 1.10 2010-11-01 04:34:33 joehw Exp $
 */
public class JavaCupRedirect {

    private final static String ERRMSG = 
		 "You must supply a filename with the -stdin option.";

    public static void _main (String args[]) {

		 // If we should call System.exit or not
         //@todo make this settable for use inside other java progs
		 boolean systemExitOK = true;

		 // This is the stream we'll set as our System.in
		 InputStream input = null;

		 // The number of arguments
		 final int argc = args.length;

		 // The arguments we'll pass to the real '_main()'
		 String[] new_args = new String[argc - 2];
		 int new_argc = 0;

		 // Parse all parameters passed to this class
		 for (int i = 0; i < argc; i++) {
		     // Parse option '-stdin '
		     if (args[i].equals("-stdin")) {
		 		 // This option must have an argument
		 		 if ((++i >= argc) || (args[i].startsWith("-"))) {
		 		     System.err.println(ERRMSG);
                     throw new RuntimeException(ERRMSG);
		 		 }
		 		 try {
		 		     input = new FileInputStream(args[i]);
		 		 }
		 		 catch (FileNotFoundException e) {
		 		     System.err.println("Could not open file "+args[i]);
                     throw new RuntimeException(e.getMessage());
		 		 }
		 		 catch (SecurityException e) {
		 		     System.err.println("No permission to file "+args[i]);
                     throw new RuntimeException(e.getMessage());
		 		 }
		     }
		     else {
		 		 if (new_argc == new_args.length) {
		 		     System.err.println("Missing -stdin option!");
                     throw new RuntimeException();
		 		 }
		 		 new_args[new_argc++] = args[i];
		     }
		 }

		 System.setIn(input);
		 try {
		     com.sun.java_cup.internal.Main.main(new_args);
		 }
		 catch (Exception e) {
		     System.err.println("Error running JavaCUP:");
		     e.printStackTrace();
		 }
    }
}