/*

* Copyright (c) 2010 Nokia Corporation and/or its subsidiary(-ies).

* All rights reserved.

* This component and the accompanying materials are made available

* under the terms of the License "Eclipse Public License v1.0"

* which accompanies this distribution, and is available

* at the URL "http://www.eclipse.org/legal/epl-v10.html".

*

* Initial Contributors:

* Nokia Corporation - initial contribution.

*

* Contributors:

*

* Description: 

*

*/

/*

   Get rid of the path to talon from a commandline string on windows find the 

   -c (if it's there) and step past it to after the quote on the first command:

   "g:\program files\talon\talon.exe" -c "gcc -c . . ."

                                          ^------ Returns a pointer to here

   Take care of the possibilty that there might be spaces in the command

   if it is quoted.

   A state-machine is flexible but not all that easy to write.  Should investigate

   the possiblity of using the Ragel state machine generator perhaps.

*/

#define CH_START 0 	/* start state */

#define CH_PRE 1	/* spaces before executable name */

#define CH_EXQUOTE 2    /* part of the executable name, outside quotes */

#define CH_INQUOTE 3	/* part of the executable name, in a quoted region */

#define CH_POST 4	/* spaces after executable name */

#define CH_MINUS 5	/* start of -c option */

#define CH_C 6		/* end of -c option */

#define CH_PRECOMMAND 7 /* spaces before shell commands */

#define CH_COMMAND 8	/* first character of shell command */

#define CH_ERR 9	/* Error! */

#include "log.h"

#include "chomp.h"

char * chompCommand(char command[])

{

	char *result = command;

	int state = CH_START;

	while (state != CH_COMMAND && state != CH_ERR)

	{

		DEBUG(("startstate: %d, char %c ",state, *result));

		switch (*result)

		{

			case ' ':

				switch (state)

				{

					case CH_START:

					case CH_PRE:

						state = CH_PRE;

						break;

					case CH_EXQUOTE:

						state = CH_POST;

						break;

					case CH_INQUOTE:

						break;

					case CH_POST:

						break;

					case CH_MINUS:

						state = CH_C;

						break;

					case CH_C:

						state = CH_PRECOMMAND;

						break;

					case CH_PRECOMMAND:

						break;

					default:

						state = CH_ERR;

						break;

				}

			break;

			case 'c':

				switch (state)

				{

					case CH_START:

					case CH_PRE:

						state = CH_EXQUOTE;

						break;

					case CH_EXQUOTE:

					case CH_INQUOTE:

						break;

					case CH_POST:

						state = CH_ERR;

						break;

					case CH_MINUS:

						state = CH_C;

						break;

					case CH_C:

					case CH_PRECOMMAND:

					default:

						state = CH_ERR;

						break;

				}

			break;

			case '-':

				switch (state)

				{

					case CH_START:

					case CH_PRE:

						state = CH_EXQUOTE;

						break;

					case CH_EXQUOTE:

					case CH_INQUOTE:

						break;

					case CH_POST:

						state = CH_MINUS;

						break;

					case CH_MINUS:

					case CH_C:

					case CH_PRECOMMAND:

					default:

						state = CH_ERR;

						break;

				}

			break;

			case '"':

				switch (state)

				{

					case CH_START:

					case CH_PRE:

					case CH_EXQUOTE:

						state = CH_INQUOTE;

						break;

					case CH_INQUOTE:

						state = CH_EXQUOTE;

						break;

					case CH_POST:

					case CH_MINUS:

					case CH_C:

						state = CH_ERR;

						break;

					case CH_PRECOMMAND:

						state = CH_COMMAND;

						break;

					default:

						state = CH_ERR;

						break;

				}

			break;

			default:

				switch (state)

				{

					case CH_START:

					case CH_PRE:

						state = CH_EXQUOTE;

						break;

					case CH_INQUOTE:

					case CH_EXQUOTE:

						break;

					default:

						state = CH_ERR;

						break;

				}

			break;

		}

		DEBUG(("endstate: %d\n",state));

		result ++;

	}

	if (state == CH_ERR)

		return (char *)0;

	return result;

}