mirror of
https://github.com/mpv-player/mpv
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928da7a448
as oded told me on 1006 02 24, i applied it, blame me if some problem occurs, i hope not, since i tried it for a while.... git-svn-id: svn://svn.mplayerhq.hu/mplayer/trunk@19979 b3059339-0415-0410-9bf9-f77b7e298cf2
502 lines
16 KiB
C
502 lines
16 KiB
C
#ifndef _M_OPTION_H
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#define _M_OPTION_H
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/// \defgroup Options
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/// m_option allows to parse, print and copy data of various types.
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/// It is the base of the \ref OptionsStruct, \ref Config and
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/// \ref Properties APIs.
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///@{
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/// \file m_option.h
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/// \ingroup OptionTypes
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typedef struct m_option_type m_option_type_t;
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typedef struct m_option m_option_t;
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struct m_struct_st;
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/// \defgroup OptionTypes Options types
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/// \ingroup Options
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///@{
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///////////////////////////// Options types declarations ////////////////////////////
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// Simple types
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extern m_option_type_t m_option_type_flag;
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extern m_option_type_t m_option_type_int;
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extern m_option_type_t m_option_type_float;
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extern m_option_type_t m_option_type_double;
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extern m_option_type_t m_option_type_string;
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extern m_option_type_t m_option_type_string_list;
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extern m_option_type_t m_option_type_position;
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extern m_option_type_t m_option_type_time_size;
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extern m_option_type_t m_option_type_print;
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extern m_option_type_t m_option_type_print_indirect;
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extern m_option_type_t m_option_type_print_func;
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extern m_option_type_t m_option_type_subconfig;
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extern m_option_type_t m_option_type_imgfmt;
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extern m_option_type_t m_option_type_afmt;
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// Func-based types
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extern m_option_type_t m_option_type_func_full;
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extern m_option_type_t m_option_type_func_param;
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extern m_option_type_t m_option_type_func;
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/// Callback used to reset func options.
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typedef void (*m_opt_default_func_t)(m_option_t *, char*);
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/// Callback used by m_option_type_func_full options.
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typedef int (*m_opt_func_full_t)(m_option_t *, char *, char *);
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/// Callback used by m_option_type_func_param options.
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typedef int (*m_opt_func_param_t)(m_option_t *, char *);
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/// Callback used by m_option_type_func options.
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typedef int (*m_opt_func_t)(m_option_t *);
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// Backwards compatibility
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typedef m_opt_default_func_t cfg_default_func_t;
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typedef m_opt_func_full_t cfg_func_arg_param_t;
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typedef m_opt_func_param_t cfg_func_param_t;
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typedef m_opt_func_t cfg_func_t;
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#define END_AT_NONE 0
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#define END_AT_TIME 1
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#define END_AT_SIZE 2
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typedef struct {
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double pos;
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int type;
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} m_time_size_t;
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/// Extra definition needed for \ref m_option_type_obj_settings_list options.
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typedef struct {
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/// Pointer to an array of pointer to some object type description struct.
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void** list;
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/// Offset of the object type name (char*) in the description struct.
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void* name_off;
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/// Offset of the object type info string (char*) in the description struct.
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void* info_off;
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/// \brief Offset of the object type parameter description (\ref m_struct_st)
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/// in the description struct.
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void* desc_off;
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} m_obj_list_t;
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/// The data type used by \ref m_option_type_obj_settings_list.
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typedef struct m_obj_settings {
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/// Type of the object.
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char* name;
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/// NULL terminated array of parameter/value pairs.
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char** attribs;
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} m_obj_settings_t;
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/// A parser to set up a list of objects.
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/** It creates a NULL terminated array \ref m_obj_settings. The option priv
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* field (\ref m_option::priv) must point to a \ref m_obj_list_t describing
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* the available object types.
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*/
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extern m_option_type_t m_option_type_obj_settings_list;
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/// Extra definition needed for \ref m_option_type_obj_presets options.
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typedef struct {
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/// Description of the struct holding the presets.
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struct m_struct_st* in_desc;
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/// Description of the struct that should be set by the presets.
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struct m_struct_st* out_desc;
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/// Pointer to an array of structs defining the various presets.
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void* presets;
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/// Offset of the preset's name inside the in_struct.
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void* name_off;
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} m_obj_presets_t;
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/// Set several fields in a struct at once.
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/** For this two struct descriptions are used. One for the struct holding the
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* preset and one for the struct beeing set. Every field present in both
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* structs will be copied from the preset struct to the destination one.
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* The option priv field (\ref m_option::priv) must point to a correctly
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* filled \ref m_obj_presets_t.
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*/
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extern m_option_type_t m_option_type_obj_presets;
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/// Parse an URL into a struct.
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/** The option priv field (\ref m_option::priv) must point to a
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* \ref m_struct_st describing which fields of the URL must be used.
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*/
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extern m_option_type_t m_option_type_custom_url;
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/// Extra definition needed for \ref m_option_type_obj_params options.
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typedef struct {
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/// Field descriptions.
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struct m_struct_st* desc;
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/// Field separator to use.
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char separator;
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} m_obj_params_t;
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/// Parse a set of parameters.
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/** Parameters are separated by the given separator and each one
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* successively sets a field from the struct. The option priv field
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* (\ref m_option::priv) must point to a \ref m_obj_params_t.
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*/
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extern m_option_type_t m_option_type_obj_params;
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typedef struct {
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int start;
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int end;
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} m_span_t;
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/// Ready made settings to parse a \ref m_span_t with a start-end syntax.
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extern m_obj_params_t m_span_params_def;
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// FIXME: backward compatibility
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#define CONF_TYPE_FLAG (&m_option_type_flag)
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#define CONF_TYPE_INT (&m_option_type_int)
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#define CONF_TYPE_FLOAT (&m_option_type_float)
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#define CONF_TYPE_DOUBLE (&m_option_type_double)
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#define CONF_TYPE_STRING (&m_option_type_string)
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#define CONF_TYPE_FUNC (&m_option_type_func)
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#define CONF_TYPE_FUNC_PARAM (&m_option_type_func_param)
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#define CONF_TYPE_PRINT (&m_option_type_print)
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#define CONF_TYPE_PRINT_INDIRECT (&m_option_type_print_indirect)
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#define CONF_TYPE_PRINT_FUNC (&m_option_type_print_func)
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#define CONF_TYPE_FUNC_FULL (&m_option_type_func_full)
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#define CONF_TYPE_SUBCONFIG (&m_option_type_subconfig)
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#define CONF_TYPE_STRING_LIST (&m_option_type_string_list)
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#define CONF_TYPE_POSITION (&m_option_type_position)
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#define CONF_TYPE_IMGFMT (&m_option_type_imgfmt)
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#define CONF_TYPE_AFMT (&m_option_type_afmt)
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#define CONF_TYPE_SPAN (&m_option_type_span)
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#define CONF_TYPE_OBJ_SETTINGS_LIST (&m_option_type_obj_settings_list)
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#define CONF_TYPE_OBJ_PRESETS (&m_option_type_obj_presets)
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#define CONF_TYPE_CUSTOM_URL (&m_option_type_custom_url)
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#define CONF_TYPE_OBJ_PARAMS (&m_option_type_obj_params)
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#define CONF_TYPE_TIME_SIZE (&m_option_type_time_size)
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/////////////////////////////////////////////////////////////////////////////////////////////
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/// Option type description
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struct m_option_type {
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char* name;
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/// Syntax description, etc
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char* comments;
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/// Size needed for the data.
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unsigned int size;
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/// See \ref OptionTypeFlags.
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unsigned int flags;
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/// Parse the data from a string.
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/** It is the only required function, all others can be NULL.
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*
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* \param opt The option that is parsed.
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* \param name The full option name.
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* \param param The parameter to parse.
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* \param dst Pointer to the memory where the data should be written.
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* If NULL the parameter validity should still be checked.
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* \param src Source of the option, see \ref OptionParserModes.
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* \return On error a negative value is returned, on success the number of arguments
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* consumed. For details see \ref OptionParserReturn.
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*/
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int (*parse)(m_option_t* opt,char *name, char *param, void* dst, int src);
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/// Print back a value in string form.
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/** \param opt The option to print.
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* \param val Pointer to the memory holding the data to be printed.
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* \return An allocated string containing the text value or (void*)-1
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* on error.
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*/
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char* (*print)(m_option_t* opt, void* val);
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/** \name
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* These functions are called to save/set/restore the status of the
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* variables. The difference between the 3 only matters for types like
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* \ref m_option_type_func where 'setting' needs to do more than just
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* copying some data.
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*/
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//@{
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/// Update a save slot (dst) from the current value in the program (src).
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/** \param opt The option to copy.
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* \param dst Pointer to the destination memory.
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* \param src Pointer to the source memory.
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*/
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void (*save)(m_option_t* opt,void* dst, void* src);
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/// Set the value in the program (dst) from a save slot.
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/** \param opt The option to copy.
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* \param dst Pointer to the destination memory.
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* \param src Pointer to the source memory.
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*/
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void (*set)(m_option_t* opt,void* dst, void* src);
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/// Copy the data between two save slots. If NULL and size is > 0 a memcpy will be used.
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/** \param opt The option to copy.
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* \param dst Pointer to the destination memory.
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* \param src Pointer to the source memory.
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*/
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void (*copy)(m_option_t* opt,void* dst, void* src);
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//@}
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/// Free the data allocated for a save slot.
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/** This is only needed for dynamic types like strings.
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* \param dst Pointer to the data, usually a pointer that should be freed and
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* set to NULL.
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*/
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void (*free)(void* dst);
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};
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///@}
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/// Option description
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/** \ingroup Options
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*/
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struct m_option {
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/// Option name.
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char *name;
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/// Reserved for higher level APIs, it shouldn't be used by parsers.
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/** The suboption parser and func types do use it. They should instead
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* use the priv field but this was inherited from older versions of the
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* config code.
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*/
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void *p;
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/// Option type.
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m_option_type_t* type;
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/// See \ref OptionFlags.
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unsigned int flags;
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/// \brief Mostly useful for numeric types, the \ref M_OPT_MIN flags must
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/// also be set.
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double min;
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/// \brief Mostly useful for numeric types, the \ref M_OPT_MAX flags must
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/// also be set.
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double max;
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/// Type dependent data (for all kinds of extended settings).
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/** This used to be a function pointer to hold a 'reverse to defaults' func.
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* Now it can be used to pass any type of extra args needed by the parser.
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* Passing a 'default func' is still valid for all func based option types.
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*/
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void* priv;
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};
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/// \defgroup OptionFlags Option flags
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///@{
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/// The option has a minimum set in \ref m_option::min.
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#define M_OPT_MIN (1<<0)
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/// The option has a maximum set in \ref m_option::max.
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#define M_OPT_MAX (1<<1)
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/// The option has a minimum and maximum in \ref m_option::min and \ref m_option::max.
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#define M_OPT_RANGE (M_OPT_MIN|M_OPT_MAX)
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/// The option is forbidden in config files.
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#define M_OPT_NOCFG (1<<2)
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/// The option is forbidden on the command line.
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#define M_OPT_NOCMD (1<<3)
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/// The option is global in the \ref Config.
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/** It won't be saved on push and the command line parser will set it when
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* it's parsed (i.e. it won't be set later)
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* e.g options : -v, -quiet
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*/
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#define M_OPT_GLOBAL (1<<4)
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/// The \ref Config won't save this option on push.
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/** It won't be saved on push but the command line parser will add it with
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* its entry (i.e. it may be set later)
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* e.g options : -include
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*/
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#define M_OPT_NOSAVE (1<<5)
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/// \brief The \ref Config will emulate the old behavior by pushing the
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/// option only if it was set by the user.
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#define M_OPT_OLD (1<<6)
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/// \defgroup OldOptionFlags Backward compatibility
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///
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/// These are kept for compatibility with older code.
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/// @{
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#define CONF_MIN M_OPT_MIN
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#define CONF_MAX M_OPT_MAX
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#define CONF_RANGE M_OPT_RANGE
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#define CONF_NOCFG M_OPT_NOCFG
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#define CONF_NOCMD M_OPT_NOCMD
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#define CONF_GLOBAL M_OPT_GLOBAL
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#define CONF_NOSAVE M_OPT_NOSAVE
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#define CONF_OLD M_OPT_OLD
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///@}
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///@}
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/// \defgroup OptionTypeFlags Option type flags
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/// \ingroup OptionTypes
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///
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/// These flags are used to describe special parser capabilities or behavior.
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///
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///@{
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/// Suboption parser flag.
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/** When this flag is set, m_option::p should point to another m_option
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* array. Only the parse function will be called. If dst is set, it should
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* create/update an array of char* containg opt/val pairs. The options in
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* the child array will then be set automatically by the \ref Config.
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* Also note that suboptions may be directly accessed by using
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* -option:subopt blah.
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*/
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#define M_OPT_TYPE_HAS_CHILD (1<<0)
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/// Wildcard matching flag.
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/** If set the option type has a use for option names ending with a *
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* (used for -aa*), this only affects the option name matching.
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*/
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#define M_OPT_TYPE_ALLOW_WILDCARD (1<<1)
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/// Dynamic data type.
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/** This flag indicates that the data is dynamically allocated (m_option::p
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* points to a pointer). It enables a little hack in the \ref Config wich
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* replaces the initial value of such variables with a dynamic copy in case
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* the initial value is statically allocated (pretty common with strings).
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*/
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#define M_OPT_TYPE_DYNAMIC (1<<2)
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/// Indirect option type.
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/** If this is set the parse function doesn't directly return
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* the wanted thing. Options use this if for some reasons they have to wait
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* until the set call to be able to correctly set the target var.
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* So for those types new values must first be parsed, then set to the target
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* var. If this flag isn't set then new values can be parsed directly to the
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* target var. It's used by the callback-based options as the callback call
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* may append later on.
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*/
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#define M_OPT_TYPE_INDIRECT (1<<3)
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///@}
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///////////////////////////// Parser flags ////////////////////////////////////////
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/// \defgroup OptionParserModes Option parser modes
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/// \ingroup Options
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///
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/// Some parsers behave differently depending on the mode passed in the src
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/// parameter of m_option_type::parse. For example the flag type doesn't take
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/// an argument when parsing from the command line.
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///@{
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/// Set when parsing from a config file.
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#define M_CONFIG_FILE 0
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/// Set when parsing command line arguments.
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#define M_COMMAND_LINE 1
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///@}
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/// \defgroup OptionParserReturn Option parser return code
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/// \ingroup Options
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///
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/// On success parsers return the number of arguments consumed: 0 or 1.
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///
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/// To indicate that MPlayer should exit without playing anything,
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/// parsers return M_OPT_EXIT minus the number of parameters they
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/// consumed: \ref M_OPT_EXIT or \ref M_OPT_EXIT-1.
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///
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/// On error one of the following (negative) error codes is returned:
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///@{
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/// For use by higher level APIs when the option name is invalid.
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#define M_OPT_UNKNOWN -1
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/// Returned when a parameter is needed but wasn't provided.
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#define M_OPT_MISSING_PARAM -2
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/// Returned when the given parameter couldn't be parsed.
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#define M_OPT_INVALID -3
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/// \brief Returned if the value is "out of range". The exact meaning may
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/// vary from type to type.
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#define M_OPT_OUT_OF_RANGE -4
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/// Returned if the parser failed for any other reason than a bad parameter.
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#define M_OPT_PARSER_ERR -5
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/// Returned when MPlayer should exit. Used by various help stuff.
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/** M_OPT_EXIT must be the lowest number on this list.
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*/
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#define M_OPT_EXIT -6
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/// \defgroup OldOptionParserReturn Backward compatibility
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///
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/// These are kept for compatibility with older code.
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///
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///@{
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#define ERR_NOT_AN_OPTION M_OPT_UNKNOWN
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#define ERR_MISSING_PARAM M_OPT_MISSING_PARAM
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#define ERR_OUT_OF_RANGE M_OPT_OUT_OF_RANGE
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#define ERR_FUNC_ERR M_OPT_PARSER_ERR
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///@}
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///@}
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/// Find the option matching the given name in the list.
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/** \ingroup Options
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* This function takes the possible wildcards into account (see
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* \ref M_OPT_TYPE_ALLOW_WILDCARD).
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*
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* \param list Pointer to an array of \ref m_option.
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* \param name Name of the option.
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* \return The matching option or NULL.
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*/
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m_option_t* m_option_list_find(m_option_t* list,const char* name);
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/// Helper to parse options, see \ref m_option_type::parse.
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inline static int
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m_option_parse(m_option_t* opt,char *name, char *param, void* dst, int src) {
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return opt->type->parse(opt,name,param,dst,src);
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}
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/// Helper to print options, see \ref m_option_type::print.
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inline static char*
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m_option_print(m_option_t* opt, void* val_ptr) {
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if(opt->type->print)
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return opt->type->print(opt,val_ptr);
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else
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return (char*)-1;
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}
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/// Helper around \ref m_option_type::save.
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inline static void
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m_option_save(m_option_t* opt,void* dst, void* src) {
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if(opt->type->save)
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opt->type->save(opt,dst,src);
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}
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/// Helper around \ref m_option_type::set.
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inline static void
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m_option_set(m_option_t* opt,void* dst, void* src) {
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if(opt->type->set)
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opt->type->set(opt,dst,src);
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}
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/// Helper around \ref m_option_type::copy.
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inline static void
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m_option_copy(m_option_t* opt,void* dst, void* src) {
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if(opt->type->copy)
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opt->type->copy(opt,dst,src);
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else if(opt->type->size > 0)
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memcpy(dst,src,opt->type->size);
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}
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/// Helper around \ref m_option_type::free.
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inline static void
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m_option_free(m_option_t* opt,void* dst) {
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if(opt->type->free)
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opt->type->free(dst);
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}
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/*@}*/
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#endif /* _M_OPTION_H */
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