json_query.h File Reference

Json query implementation. More...

#include "dist/sds/sds.h"
#include "src/lib/fields.h"
#include "src/lib/list.h"
#include "src/lib/validate.h"
#include <stdbool.h>

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Data Structures
struct	t_json_parse_error

Typedefs
typedef bool(*	iterate_callback) (const char *, sds, sds, int, validate_callback, void *, struct t_json_parse_error *)

Functions
void	json_parse_error_init (struct t_json_parse_error *parse_error)
void	json_parse_error_clear (struct t_json_parse_error *parse_error)
bool	json_get_bool (sds s, const char *path, bool *result, struct t_json_parse_error *error)
bool	json_get_int_max (sds s, const char *path, int *result, struct t_json_parse_error *error)
bool	json_get_int (sds s, const char *path, int min, int max, int *result, struct t_json_parse_error *error)
bool	json_get_time_max (sds s, const char *path, time_t *result, struct t_json_parse_error *error)
bool	json_get_int64_max (sds s, const char *path, int64_t *result, struct t_json_parse_error *error)
bool	json_get_int64 (sds s, const char *path, int64_t min, int64_t max, int64_t *result, struct t_json_parse_error *error)
bool	json_get_uint_max (sds s, const char *path, unsigned *result, struct t_json_parse_error *error)
bool	json_get_uint (sds s, const char *path, unsigned min, unsigned max, unsigned *result, struct t_json_parse_error *error)
bool	json_get_string_max (sds s, const char *path, sds *result, validate_callback vcb, struct t_json_parse_error *error)
bool	json_get_string (sds s, const char *path, size_t min, size_t max, sds *result, validate_callback vcb, struct t_json_parse_error *error)
bool	json_get_string_cmp (sds s, const char *path, size_t min, size_t max, const char *cmp, sds *result, struct t_json_parse_error *error)
bool	json_get_array_string (sds s, const char *path, struct t_list *l, validate_callback vcb, int max_elements, struct t_json_parse_error *error)
bool	json_get_array_int64 (sds s, const char *path, struct t_list *l, int max_elements, struct t_json_parse_error *error)
bool	json_get_object_string (sds s, const char *path, struct t_list *l, validate_callback vcb_key, validate_callback vcb_value, int max_elements, struct t_json_parse_error *error)
bool	json_iterate_object (sds s, const char *path, iterate_callback icb, void *icb_userdata, validate_callback vcb_key, validate_callback vcb_value, int max_elements, struct t_json_parse_error *error)
bool	json_get_fields (sds s, const char *path, struct t_fields *tags, int max_elements, struct t_json_parse_error *error)
bool	json_get_tag_values (sds s, const char *path, struct mpd_song *song, validate_callback vcb, int max_elements, struct t_json_parse_error *error)
bool	json_find_key (sds s, const char *path)
sds	json_get_key_as_sds (sds s, const char *path)
const char *	get_mjson_toktype_name (int vtype)
sds	list_to_json_array (sds s, struct t_list *l)
bool	json_get_fields_as_string (sds s, sds *fields, struct t_json_parse_error *error)

Detailed Description

Json query implementation.

Typedef Documentation

iterate_callback

typedef bool(* iterate_callback) (const char *, sds, sds, int, validate_callback, void *, struct t_json_parse_error *)

Iteration callback definition

Function Documentation

get_mjson_toktype_name()

const char * get_mjson_toktype_name

(

int

vtype

)

Returns the name of a mjson token type

Parameters

vtype

token type

Returns

token type as string

json_find_key()

bool json_find_key	(	sds	s,
		const char *	path
	)

Searches for a key in json object

Parameters

s	json object to search
path	mjson path expression

Returns

true on success, else false

json_get_array_int64()

bool json_get_array_int64	(	sds	s,
		const char *	path,
		struct t_list *	l,
		int	max_elements,
		struct t_json_parse_error *	error
	)

Converts a json array of int64_t to a t_list struct Shortcut for json_iterate_object with icb_json_get_array_int64

Parameters

s	json object to parse
path	mjson path expression
l	t_list struct to populate
max_elements	maximum of elements
error	pointer to t_json_parse_error

Returns

true on success else false

json_get_array_string()

bool json_get_array_string	(	sds	s,
		const char *	path,
		struct t_list *	l,
		validate_callback	vcb,
		int	max_elements,
		struct t_json_parse_error *	error
	)

Converts a json array of strings to a t_list struct Shortcut for json_iterate_object with icb_json_get_array_string

Parameters

s	json object to parse
path	mjson path expression
l	t_list struct to populate
vcb	validation callback
max_elements	maximum of elements
error	pointer to t_json_parse_error

Returns

true on success else false

json_get_bool()

bool json_get_bool	(	sds	s,
		const char *	path,
		bool *	result,
		struct t_json_parse_error *	error
	)

Gets a bool value by json path

Parameters

s	json object to parse
path	mjson path expression
result	pointer to bool with the result
error	pointer to t_json_parse_error

Returns

true on success else false

json_get_fields()

bool json_get_fields	(	sds	s,
		const char *	path,
		struct t_fields *	tags,
		int	max_elements,
		struct t_json_parse_error *	error
	)

Converts a json array to a struct t_tags Shortcut for json_iterate_object with icb_json_get_tag

Parameters

s	json object to parse
path	mjson path expression
tags	t_tags struct to populate
max_elements	maximum of elements
error	pointer to t_json_parse_error

Returns

true on success, else false

json_get_fields_as_string()

bool json_get_fields_as_string	(	sds	s,
		sds *	fields,
		struct t_json_parse_error *	error
	)

Helper function to get myMPD fields out of a jsonrpc request and return a validated json array

Parameters

s	sds string to parse
fields	sds string to append the fields
error	pointer to t_json_parse_error

Returns

true on success, else false

json_get_int()

bool json_get_int	(	sds	s,
		const char *	path,
		int	min,
		int	max,
		int *	result,
		struct t_json_parse_error *	error
	)

Gets a int value by json path

Parameters

s	json object to parse
path	mjson path expression
min	minimum value (including)
max	maximum value (including)
result	pointer to int with the result
error	pointer to t_json_parse_error

Returns

true on success else false

json_get_int64()

bool json_get_int64	(	sds	s,
		const char *	path,
		int64_t	min,
		int64_t	max,
		int64_t *	result,
		struct t_json_parse_error *	error
	)

Gets an int64_t value by json path

Parameters

s	json object to parse
path	mjson path expression
min	minimum value (including)
max	maximum value (including)
result	pointer to int64_t with the result
error	pointer to t_json_parse_error

Returns

true on success else false

json_get_int64_max()

bool json_get_int64_max	(	sds	s,
		const char *	path,
		int64_t *	result,
		struct t_json_parse_error *	error
	)

Gets an int64_t value by json path

Parameters

s	json object to parse
path	mjson path expression
result	pointer to int64_t with the result
error	pointer to t_json_parse_error

Returns

true on success else false

json_get_int_max()

bool json_get_int_max	(	sds	s,
		const char *	path,
		int *	result,
		struct t_json_parse_error *	error
	)

Gets a int value by json path

Parameters

s	json object to parse
path	mjson path expression
result	pointer to int with the result
error	pointer to t_json_parse_error

Returns

true on success else false

json_get_key_as_sds()

sds json_get_key_as_sds	(	sds	s,
		const char *	path
	)

Searches for a key in json object and returns its value as sds string

Parameters

s	json object to search
path	mjson path expression

Returns

Key value as sds

json_get_object_string()

bool json_get_object_string	(	sds	s,
		const char *	path,
		struct t_list *	l,
		validate_callback	vcb_key,
		validate_callback	vcb_value,
		int	max_elements,
		struct t_json_parse_error *	error
	)

Converts a json object key/values to a t_list struct Shortcut for json_iterate_object with icb_json_get_object_string

Parameters

s	json object to parse
path	mjson path expression
l	t_list struct to populate
vcb_key	validation callback for key
vcb_value	validation callback for value
max_elements	maximum of elements
error	pointer to t_json_parse_error

Returns

true on success, else false

json_get_string()

bool json_get_string	(	sds	s,
		const char *	path,
		size_t	min,
		size_t	max,
		sds *	result,
		validate_callback	vcb,
		struct t_json_parse_error *	error
	)

Gets a string value by json path

Parameters

s	json object to parse
path	mjson path expression
result	pointer to int with the result
min	minimum length (inclusive)
max	maximum length (inclusive)
vcb	validation callback
error	pointer to t_json_parse_error

Returns

true on success else false

json_get_string_cmp()

bool json_get_string_cmp	(	sds	s,
		const char *	path,
		size_t	min,
		size_t	max,
		const char *	cmp,
		sds *	result,
		struct t_json_parse_error *	error
	)

Gets a string value by json path

Parameters

s	json object to parse
path	mjson path expression
result	pointer to sds with the result
min	minimum length (inclusive)
max	maximum length (inclusive)
cmp	compare result against this string
error	pointer to t_json_parse_error

Returns

true on success else false

json_get_string_max()

bool json_get_string_max	(	sds	s,
		const char *	path,
		sds *	result,
		validate_callback	vcb,
		struct t_json_parse_error *	error
	)

Gets a string value by json path

Parameters

s	json object to parse
path	mjson path expression
result	pointer to sds with the result
vcb	validation callback
error	pointer to t_json_parse_error

Returns

true on success else false

json_get_tag_values()

bool json_get_tag_values	(	sds	s,
		const char *	path,
		struct mpd_song *	song,
		validate_callback	vcb,
		int	max_elements,
		struct t_json_parse_error *	error
	)

Converts a json array to a mpd song tag value(s) Shortcut for json_iterate_object with icb_json_get_tag_value

Parameters

s	json object to parse
path	mjson path expression
song	mpd_song struct
vcb	validation callback
max_elements	maximum of elements
error	pointer to t_json_parse_error

Returns

true on success else false

json_get_time_max()

bool json_get_time_max	(	sds	s,
		const char *	path,
		time_t *	result,
		struct t_json_parse_error *	error
	)

Gets a time_t value by json path

Parameters

s	json object to parse
path	mjson path expression
result	pointer to time_t with the result
error	pointer to t_json_parse_error

Returns

true on success else false

json_get_uint()

bool json_get_uint	(	sds	s,
		const char *	path,
		unsigned	min,
		unsigned	max,
		unsigned *	result,
		struct t_json_parse_error *	error
	)

Gets a unsigned int value by json path

Parameters

s	json object to parse
path	mjson path expression
min	minimum value (including)
max	maximum value (including)
result	pointer to unsigned int with the result
error	pointer to t_json_parse_error

Returns

true on success else false

json_get_uint_max()

bool json_get_uint_max	(	sds	s,
		const char *	path,
		unsigned *	result,
		struct t_json_parse_error *	error
	)

Gets a unsigned int value by json path

Parameters

s	json object to parse
path	mjson path expression
result	pointer to unsigned int with the result
error	pointer to t_json_parse_error

Returns

true on success else false

json_iterate_object()

bool json_iterate_object	(	sds	s,
		const char *	path,
		iterate_callback	icb,
		void *	icb_userdata,
		validate_callback	vcb_key,
		validate_callback	vcb_value,
		int	max_elements,
		struct t_json_parse_error *	error
	)

Iterates through object/array found by path

Parameters

s	json object to parse
path	mjson path expression
icb	iteration callback
icb_userdata	custom data for iteration callback
vcb_key	validation callback for the key
vcb_value	validation callback for the value
max_elements	maximum of elements
error	pointer to t_json_parse_error

Returns

true on success else false

json_parse_error_clear()

void json_parse_error_clear

(

struct t_json_parse_error *

parse_error

)

Clears the sds strings

Parameters

parse_error

t_json_parse_error struct to clear

json_parse_error_init()

void json_parse_error_init

(

struct t_json_parse_error *

parse_error

)

public functions Initializes the sds strings t_json_parse_error struct to NULL

Parameters

parse_error

t_json_parse_error struct to initialize

list_to_json_array()

sds list_to_json_array	(	sds	s,
		struct t_list *	l
	)

Prints the keys of a list as a json array Leading and ending square brackets are added

Parameters

s	sds string to append
l	pointer to list to add keys from

Returns

pointer to s