/*  Copyright (C) 1996-1997  Id Software, Inc.

    This program 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 of the License, or
    (at your option) any later version.

    This program 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 this program; if not, write to the Free Software
    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA

    See file, 'COPYING', for details.
*/

// scriplib.c

#include "cmdlib.h"
#include "scriplib.h"

/*
=============================================================================

                                                PARSING STUFF

=============================================================================
*/

char		token[ MAXTOKEN ];
char		*scriptbuffer, *script_p, *scriptend_p;
int		grabbed;
int		scriptline;
qboolean	endofscript;
qboolean	tokenready;              // only true if UnGetToken was just called

/*
==============
=
= LoadScriptFile
=
==============
*/

void
LoadScriptFile( char *filename ) {
	int size;

	size = LoadFile( filename, (void **) &scriptbuffer );

	script_p = scriptbuffer;
	scriptend_p = script_p + size;
	scriptline = 1;
	endofscript = false;
	tokenready = false;
}

/*
==============
=
= UnGetToken
=
= Signals that the current token was not used, and should be reported
= for the next GetToken.  Note that

GetToken (true);
UnGetToken ();
GetToken (false);

= could cross a line boundary.
=
==============
*/

void
UnGetToken( void ) {
	tokenready = true;
}

/*
==============
GetToken
==============
*/
qboolean
GetToken( qboolean crossline ) {
	char *token_p;

	if( tokenready ) { // is a token allready waiting?
		tokenready = false;
		return true;
	}

	if( script_p >= scriptend_p ) {
		if( !crossline )
			Error( "Line %i is incomplete\n", scriptline );
		endofscript = true;
		return false;
	}

	//
	// skip space
	//
skipspace:
	while( *script_p <= 32 ) {
		if( script_p >= scriptend_p ) {
			if( !crossline )
				Error( "Line %i is incomplete\n", scriptline );
			endofscript = true;
			return true;
		}
		if( *script_p++ == '\n' ) {
			if( !crossline )
				Error( "Line %i is incomplete\n", scriptline );
			scriptline++;
		}
	}

	if( script_p >= scriptend_p ) {
		if( !crossline )
			Error( "Line %i is incomplete\n", scriptline );
		endofscript = true;
		return true;
	}

	if( *script_p == ';' || *script_p == '#' ) { // semicolon is comment field
		// also make # a comment field
		if( !crossline )
			Error( "Line %i is incomplete\n", scriptline );
		while( *script_p++ != '\n' )
			if( script_p >= scriptend_p ) {
				endofscript = true;
				return false;
			}
		goto skipspace;
	}

	//
	// copy token
	//
	token_p = token;

	while( *script_p > 32 && *script_p != ';' ) {
		*token_p++ = *script_p++;
		if( script_p == scriptend_p )
			break;
		if( token_p == &token[ MAXTOKEN ] )
			Error( "Token too large on line %i\n", scriptline );
	}

	*token_p = 0;
	return true;
}

/*
==============
=
= TokenAvailable
=
= Returns true if there is another token on the line
=
==============
*/

qboolean
TokenAvailable( void ) {
	char *search_p;

	search_p = script_p;

	if( search_p >= scriptend_p )
		return false;

	while( *search_p <= 32 ) {
		if( *search_p == '\n' )
			return false;

		search_p++;
		if( search_p == scriptend_p )
			return false;
	}

	if( *search_p == ';' )
		return false;

	return true;
}

