/***************************************************************************

    options.h

    Core options code code

    Copyright (c) 1996-2007, Nicola Salmoria and the MAME Team.
    Visit http://mamedev.org for licensing and usage restrictions.

***************************************************************************/

#ifndef __OPTIONS_H__
#define __OPTIONS_H__

#include "osdcore.h"
#include "corefile.h"



/***************************************************************************
    CONSTANTS
***************************************************************************/

/* unadorned option names */
#define MAX_UNADORNED_OPTIONS		16
#define OPTION_UNADORNED(x)			(((x) < MAX_UNADORNED_OPTIONS) ? option_unadorned[x] : "")

/* option flags */
#define OPTION_BOOLEAN				0x0001			/* option is a boolean value */
#define OPTION_DEPRECATED			0x0002			/* option is deprecated */
#define OPTION_COMMAND				0x0004			/* option is a command */
#define OPTION_HEADER				0x0008			/* text-only header */
#define OPTION_INTERNAL				0x0010			/* option is internal-only */
#define OPTION_REPEATS				0x0020			/* unadorned option repeats */

/* option priorities */
#define OPTION_PRIORITY_DEFAULT		0				/* defaults are at 0 priority */
#define OPTION_PRIORITY_LOW			50				/* low priority */
#define OPTION_PRIORITY_NORMAL		100				/* normal priority */
#define OPTION_PRIORITY_HIGH		150				/* high priority */
#define OPTION_PRIORITY_MAXIMUM		255				/* maximum priority */



/***************************************************************************
    TYPE DEFINITIONS
***************************************************************************/

/* opaque type representing a collection of options */
typedef struct _core_options core_options;

/* opaque type use for enumeration of options */
typedef struct _options_enumerator options_enumerator;

/* describes a single option with its description and default value */
typedef struct _options_entry options_entry;
struct _options_entry
{
	const char *		name;				/* name on the command line */
	const char *		defvalue;			/* default value of this argument */
	UINT32				flags;				/* flags to describe the option */
	const char *		description;		/* description for -showusage */
};

/* output messages are one of the following types */
enum _options_message
{
	OPTMSG_INFO,
	OPTMSG_WARNING,
	OPTMSG_ERROR,
	OPTMSG_COUNT
};
typedef enum _options_message options_message;

/* option ranges are one of the following types */
enum _options_range_type
{
	OPTION_RANGE_NONE,
	OPTION_RANGE_INT,
	OPTION_RANGE_FLOAT
};
typedef enum _options_range_type options_range_type;



/***************************************************************************
    GLOBAL VARIABLES
***************************************************************************/

extern const char *const option_unadorned[MAX_UNADORNED_OPTIONS];



/***************************************************************************
    FUNCTION PROTOTYPES
***************************************************************************/


/* ----- options collection management ----- */

/* create a new collection of options */
core_options *options_create(void (*fail)(const char *message));

/* free a collection of options */
void options_free(core_options *opts);

/* set a callback for a particular class of message */
void options_set_output_callback(core_options *opts, options_message msgtype, void (*callback)(const char *s));

/* revert options at or below a certain priority back to their defaults */
void options_revert(core_options *opts, int priority);

/* copy one collection of options into another */
int options_copy(core_options *dest_opts, core_options *src_opts);

/* compare two collections of options */
int options_equal(core_options *opts1, core_options *opts2);



/* ----- option definitions ----- */

/* add a set of entries to an options collection */
int options_add_entries(core_options *opts, const options_entry *entrylist);

/* set the default value for a particular option entry */
int options_set_option_default_value(core_options *opts, const char *name, const char *defvalue);

/* set a callback for a particular option entry */
int options_set_option_callback(core_options *opts, const char *name, void (*callback)(core_options *opts, const char *arg));



/* ----- option data extraction ----- */

/* parse option data from a command line */
int options_parse_command_line(core_options *opts, int argc, char **argv, int priority);

/* parse option data from an INI file */
int options_parse_ini_file(core_options *opts, core_file *inifile, int priority);



/* ----- options output ----- */

/* output option data to an INI file */
void options_output_ini_file(core_options *opts, core_file *inifile);

/* output differing option data to an INI file */
void options_output_diff_ini_file(core_options *opts, core_options *baseopts, core_file *inifile);

/* output option data to a standard file handle */
void options_output_ini_stdfile(core_options *opts, FILE *inifile);

/* output help using the specified output function */
void options_output_help(core_options *opts, void (*output)(const char *s));



/* ----- options reading ----- */

/* read an option as a string */
const char *options_get_string(core_options *opts, const char *name);

/* read an option as a boolean */
int options_get_bool(core_options *opts, const char *name);

/* read an option as an integer */
int options_get_int(core_options *opts, const char *name);

/* read an option as a floating point value */
float options_get_float(core_options *opts, const char *name);

/* read an option as a string */
UINT32 options_get_seqid(core_options *opts, const char *name);



/* ----- options setting ----- */

/* set an option as a string */
void options_set_string(core_options *opts, const char *name, const char *value, int priority);

/* set an option as a boolean */
void options_set_bool(core_options *opts, const char *name, int value, int priority);

/* set an option as an integer */
void options_set_int(core_options *opts, const char *name, int value, int priority);

/* set an option as a floating point value */
void options_set_float(core_options *opts, const char *name, float value, int priority);



/* ----- option definition queries ----- */

/* begin enumerating option definitions */
options_enumerator *options_enumerator_begin(core_options *opts);

/* get the next option in sequence */
const char *options_enumerator_next(options_enumerator *enumerator);

/* free memory allocated for enumeration */
void options_enumerator_free(options_enumerator *enumerator);

/* get the type of range for a given option */
options_range_type options_get_range_type(core_options *opts, const char *name);

/* return an integer range for a given option */
void options_get_range_int(core_options *opts, const char *name, int *minval, int *maxval);

/* return a floating point range for a given option */
void options_get_range_float(core_options *opts, const char *name, float *minval, float *maxval);


#endif /* __OPTIONS_H__ */
