[thirdparty/systemd.git] / src / shared / json.h

/* SPDX-License-Identifier: LGPL-2.1+ */
#pragma once

#include <stdbool.h>
#include <stddef.h>
#include <stdint.h>

#include "macro.h"
#include "string-util.h"
#include "util.h"

/*
  In case you wonder why we have our own JSON implementation, here are a couple of reasons why this implementation has
  benefits over various other implementatins:

  - We need support for 64bit signed and unsigned integers, i.e. the full 64,5bit range of -9223372036854775808…18446744073709551615
  - All our variants are immutable after creation
  - Special values such as true, false, zero, null, empty strings, empty array, empty objects require zero dynamic memory
  - Progressive parsing
  - Our integer/real type implicitly converts, but only if that's safe and loss-lessly possible
  - There's a "builder" for putting together objects easily in varargs function calls
  - There's a "dispatcher" for mapping objects to C data structures
  - Every variant optionally carries parsing location information, which simplifies debugging and parse log error generation
  - Formatter has color, line, column support

  Limitations:
  - Doesn't allow embedded NUL in strings
  - Can't store integers outside of the -9223372036854775808…18446744073709551615 range (it will use 'long double' for
    values outside this range, which is lossy)
  - Can't store negative zero (will be treated identical to positive zero, and not retained across serialization)
  - Can't store non-integer numbers that can't be stored in "long double" losslessly
  - Allows creation and parsing of objects with duplicate keys. The "dispatcher" will refuse them however. This means
    we can parse and pass around such objects, but will carefully refuse them when we convert them into our own data.

  (These limitations should be pretty much in line with those of other JSON implementations, in fact might be less
  limiting in most cases even.)
*/

typedef struct JsonVariant JsonVariant;

typedef enum JsonVariantType {
        JSON_VARIANT_STRING,
        JSON_VARIANT_INTEGER,
        JSON_VARIANT_UNSIGNED,
        JSON_VARIANT_REAL,
        JSON_VARIANT_NUMBER, /* This a pseudo-type: we can never create variants of this type, but we use it as wildcard check for the above three types */
        JSON_VARIANT_BOOLEAN,
        JSON_VARIANT_ARRAY,
        JSON_VARIANT_OBJECT,
        JSON_VARIANT_NULL,
        _JSON_VARIANT_TYPE_MAX,
        _JSON_VARIANT_TYPE_INVALID = -1
} JsonVariantType;

int json_variant_new_stringn(JsonVariant **ret, const char *s, size_t n);
int json_variant_new_integer(JsonVariant **ret, intmax_t i);
int json_variant_new_unsigned(JsonVariant **ret, uintmax_t u);
int json_variant_new_real(JsonVariant **ret, long double d);
int json_variant_new_boolean(JsonVariant **ret, bool b);
int json_variant_new_array(JsonVariant **ret, JsonVariant **array, size_t n);
int json_variant_new_array_bytes(JsonVariant **ret, const void *p, size_t n);
int json_variant_new_array_strv(JsonVariant **ret, char **l);
int json_variant_new_object(JsonVariant **ret, JsonVariant **array, size_t n);
int json_variant_new_null(JsonVariant **ret);

static inline int json_variant_new_string(JsonVariant **ret, const char *s) {
        return json_variant_new_stringn(ret, s, strlen_ptr(s));
}

JsonVariant *json_variant_ref(JsonVariant *v);
JsonVariant *json_variant_unref(JsonVariant *v);
void json_variant_unref_many(JsonVariant **array, size_t n);

DEFINE_TRIVIAL_CLEANUP_FUNC(JsonVariant *, json_variant_unref);

const char *json_variant_string(JsonVariant *v);
intmax_t json_variant_integer(JsonVariant *v);
uintmax_t json_variant_unsigned(JsonVariant *v);
long double json_variant_real(JsonVariant *v);
bool json_variant_boolean(JsonVariant *v);

JsonVariantType json_variant_type(JsonVariant *v);
bool json_variant_has_type(JsonVariant *v, JsonVariantType type);

static inline bool json_variant_is_string(JsonVariant *v) {
        return json_variant_has_type(v, JSON_VARIANT_STRING);
}

static inline bool json_variant_is_integer(JsonVariant *v) {
        return json_variant_has_type(v, JSON_VARIANT_INTEGER);
}

static inline bool json_variant_is_unsigned(JsonVariant *v) {
        return json_variant_has_type(v, JSON_VARIANT_UNSIGNED);
}

static inline bool json_variant_is_real(JsonVariant *v) {
        return json_variant_has_type(v, JSON_VARIANT_REAL);
}

static inline bool json_variant_is_number(JsonVariant *v) {
        return json_variant_has_type(v, JSON_VARIANT_NUMBER);
}

static inline bool json_variant_is_boolean(JsonVariant *v) {
        return json_variant_has_type(v, JSON_VARIANT_BOOLEAN);
}

static inline bool json_variant_is_array(JsonVariant *v) {
        return json_variant_has_type(v, JSON_VARIANT_ARRAY);
}

static inline bool json_variant_is_object(JsonVariant *v) {
        return json_variant_has_type(v, JSON_VARIANT_OBJECT);
}

static inline bool json_variant_is_null(JsonVariant *v) {
        return json_variant_has_type(v, JSON_VARIANT_NULL);
}

bool json_variant_is_negative(JsonVariant *v);

size_t json_variant_elements(JsonVariant *v);
JsonVariant *json_variant_by_index(JsonVariant *v, size_t index);
JsonVariant *json_variant_by_key(JsonVariant *v, const char *key);
JsonVariant *json_variant_by_key_full(JsonVariant *v, const char *key, JsonVariant **ret_key);

bool json_variant_equal(JsonVariant *a, JsonVariant *b);

struct json_variant_foreach_state {
        JsonVariant *variant;
        size_t idx;
};

#define JSON_VARIANT_ARRAY_FOREACH(i, v)                                \
        for (struct json_variant_foreach_state _state = { (v), 0 };     \
             _state.idx < json_variant_elements(_state.variant) &&      \
                     ({ i = json_variant_by_index(_state.variant, _state.idx); \
                             true; });                                  \
             _state.idx++)

#define JSON_VARIANT_OBJECT_FOREACH(k, e, v)                            \
        for (struct json_variant_foreach_state _state = { (v), 0 };     \
             _state.idx < json_variant_elements(_state.variant) &&      \
                     ({ k = json_variant_by_index(_state.variant, _state.idx); \
                             e = json_variant_by_index(_state.variant, _state.idx + 1); \
                             true; });                                  \
             _state.idx += 2)

int json_variant_get_source(JsonVariant *v, const char **ret_source, unsigned *ret_line, unsigned *ret_column);

typedef enum JsonFormatFlags {
        JSON_FORMAT_NEWLINE    = 1 << 0, /* suffix with newline */
        JSON_FORMAT_PRETTY     = 1 << 1, /* add internal whitespace to appeal to human readers */
        JSON_FORMAT_COLOR      = 1 << 2, /* insert ANSI color sequences */
        JSON_FORMAT_COLOR_AUTO = 1 << 3, /* insert ANSI color sequences if colors_enabled() says so */
        JSON_FORMAT_SOURCE     = 1 << 4, /* prefix with source filename/line/column */
        JSON_FORMAT_SSE        = 1 << 5, /* prefix/suffix with W3C server-sent events */
        JSON_FORMAT_SEQ        = 1 << 6, /* prefix/suffix with RFC 7464 application/json-seq */
} JsonFormatFlags;

int json_variant_format(JsonVariant *v, JsonFormatFlags flags, char **ret);
void json_variant_dump(JsonVariant *v, JsonFormatFlags flags, FILE *f, const char *prefix);

int json_parse(const char *string, JsonVariant **ret, unsigned *ret_line, unsigned *ret_column);
int json_parse_continue(const char **p, JsonVariant **ret, unsigned *ret_line, unsigned *ret_column);
int json_parse_file(FILE *f, const char *path, JsonVariant **ret, unsigned *ret_line, unsigned *ret_column);

enum {
        _JSON_BUILD_STRING,
        _JSON_BUILD_INTEGER,
        _JSON_BUILD_UNSIGNED,
        _JSON_BUILD_REAL,
        _JSON_BUILD_BOOLEAN,
        _JSON_BUILD_ARRAY_BEGIN,
        _JSON_BUILD_ARRAY_END,
        _JSON_BUILD_OBJECT_BEGIN,
        _JSON_BUILD_OBJECT_END,
        _JSON_BUILD_PAIR,
        _JSON_BUILD_PAIR_CONDITION,
        _JSON_BUILD_NULL,
        _JSON_BUILD_VARIANT,
        _JSON_BUILD_LITERAL,
        _JSON_BUILD_STRV,
        _JSON_BUILD_MAX,
};

#define JSON_BUILD_STRING(s) _JSON_BUILD_STRING, ({ const char *_x = s; _x; })
#define JSON_BUILD_INTEGER(i) _JSON_BUILD_INTEGER, ({ intmax_t _x = i; _x; })
#define JSON_BUILD_UNSIGNED(u) _JSON_BUILD_UNSIGNED, ({ uintmax_t _x = u; _x; })
#define JSON_BUILD_REAL(d) _JSON_BUILD_REAL, ({ long double _x = d; _x; })
#define JSON_BUILD_BOOLEAN(b) _JSON_BUILD_BOOLEAN, ({ bool _x = b; _x; })
#define JSON_BUILD_ARRAY(...) _JSON_BUILD_ARRAY_BEGIN, __VA_ARGS__, _JSON_BUILD_ARRAY_END
#define JSON_BUILD_OBJECT(...) _JSON_BUILD_OBJECT_BEGIN, __VA_ARGS__, _JSON_BUILD_OBJECT_END
#define JSON_BUILD_PAIR(n, ...) _JSON_BUILD_PAIR, ({ const char *_x = n; _x; }), __VA_ARGS__
#define JSON_BUILD_PAIR_CONDITION(c, n, ...) _JSON_BUILD_PAIR_CONDITION, ({ bool _x = c; _x; }), ({ const char *_x = n; _x; }), __VA_ARGS__
#define JSON_BUILD_NULL _JSON_BUILD_NULL
#define JSON_BUILD_VARIANT(v) _JSON_BUILD_VARIANT, ({ JsonVariant *_x = v; _x; })
#define JSON_BUILD_LITERAL(l) _JSON_BUILD_LITERAL, ({ const char *_x = l; _x; })
#define JSON_BUILD_STRV(l) _JSON_BUILD_STRV, ({ char **_x = l; _x; })

int json_build(JsonVariant **ret, ...);
int json_buildv(JsonVariant **ret, va_list ap);

/* A bitmask of flags used by the dispatch logic. Note that this is a combined bit mask, that is generated from the bit
 * mask originally passed into json_dispatch(), the individual bitmask associated with the static JsonDispatch callout
 * entry, as well the bitmask specified for json_log() calls */
typedef enum JsonDispatchFlags {
        /* The following three may be set in JsonDispatch's .flags field or the json_dispatch() flags parameter  */
        JSON_PERMISSIVE = 1 << 0, /* Shall parsing errors be considered fatal for this property? */
        JSON_MANDATORY  = 1 << 1, /* Should existance of this property be mandatory? */
        JSON_LOG        = 1 << 2, /* Should the parser log about errors? */

        /* The following two may be passed into log_json() in addition to the three above */
        JSON_DEBUG      = 1 << 3, /* Indicates that this log message is a debug message */
        JSON_WARNING    = 1 << 4, /* Indicates that this log message is a warning message */
} JsonDispatchFlags;

typedef int (*JsonDispatchCallback)(const char *name, JsonVariant *variant, JsonDispatchFlags flags, void *userdata);

typedef struct JsonDispatch {
        const char *name;
        JsonVariantType type;
        JsonDispatchCallback callback;
        size_t offset;
        JsonDispatchFlags flags;
} JsonDispatch;

int json_dispatch(JsonVariant *v, const JsonDispatch table[], JsonDispatchCallback bad, JsonDispatchFlags flags, void *userdata);

int json_dispatch_string(const char *name, JsonVariant *variant, JsonDispatchFlags flags, void *userdata);
int json_dispatch_strv(const char *name, JsonVariant *variant, JsonDispatchFlags flags, void *userdata);
int json_dispatch_boolean(const char *name, JsonVariant *variant, JsonDispatchFlags flags, void *userdata);
int json_dispatch_tristate(const char *name, JsonVariant *variant, JsonDispatchFlags flags, void *userdata);
int json_dispatch_variant(const char *name, JsonVariant *variant, JsonDispatchFlags flags, void *userdata);
int json_dispatch_integer(const char *name, JsonVariant *variant, JsonDispatchFlags flags, void *userdata);
int json_dispatch_unsigned(const char *name, JsonVariant *variant, JsonDispatchFlags flags, void *userdata);
int json_dispatch_uint32(const char *name, JsonVariant *variant, JsonDispatchFlags flags, void *userdata);
int json_dispatch_int32(const char *name, JsonVariant *variant, JsonDispatchFlags flags, void *userdata);

assert_cc(sizeof(uintmax_t) == sizeof(uint64_t))
#define json_dispatch_uint64 json_dispatch_unsigned

assert_cc(sizeof(intmax_t) == sizeof(int64_t))
#define json_dispatch_int64 json_dispatch_integer

static inline int json_dispatch_level(JsonDispatchFlags flags) {

        /* Did the user request no logging? If so, then never log higher than LOG_DEBUG. Also, if this is marked as
         * debug message, then also log at debug level. */

        if (!(flags & JSON_LOG) ||
            (flags & JSON_DEBUG))
                return LOG_DEBUG;

        /* Are we invoked in permissive mode, or is this explicitly marked as warning message? Then this should be
         * printed at LOG_WARNING */
        if (flags & (JSON_PERMISSIVE|JSON_WARNING))
                return LOG_WARNING;

        /* Otherwise it's an error. */
        return LOG_ERR;
}

int json_log_internal(JsonVariant *variant, int level, int error, const char *file, int line, const char *func, const char *format, ...)  _printf_(7, 8);

#define json_log(variant, flags, error, ...)                       \
        ({                                                              \
                int _level = json_dispatch_level(flags), _e = (error);    \
                (log_get_max_level() >= LOG_PRI(_level))                \
                        ? json_log_internal(variant, _level, _e, __FILE__, __LINE__, __func__, __VA_ARGS__) \
                        : -abs(_e);                                     \
        })

#define JSON_VARIANT_STRING_CONST(x) _JSON_VARIANT_STRING_CONST(UNIQ, (x))

#define _JSON_VARIANT_STRING_CONST(xq, x)                               \
        ({                                                              \
                _align_(2) static const char UNIQ_T(json_string_const, xq)[] = (x); \
                assert((((uintptr_t) UNIQ_T(json_string_const, xq)) & 1) == 0); \
                (JsonVariant*) ((uintptr_t) UNIQ_T(json_string_const, xq) + 1); \
        })

const char *json_variant_type_to_string(JsonVariantType t);
JsonVariantType json_variant_type_from_string(const char *s);
Commit	Line	Data
cd0b6c53	1	/* SPDX-License-Identifier: LGPL-2.1+ */
cd0b6c53 LP	2	#pragma once
	3
	4	#include <stdbool.h>
	5	#include <stddef.h>
	6	#include <stdint.h>
	7
	8	#include "macro.h"
	9	#include "string-util.h"
	10	#include "util.h"
	11
	12	/*
	13	In case you wonder why we have our own JSON implementation, here are a couple of reasons why this implementation has
	14	benefits over various other implementatins:
	15
	16	- We need support for 64bit signed and unsigned integers, i.e. the full 64,5bit range of -9223372036854775808…18446744073709551615
	17	- All our variants are immutable after creation
	18	- Special values such as true, false, zero, null, empty strings, empty array, empty objects require zero dynamic memory
	19	- Progressive parsing
	20	- Our integer/real type implicitly converts, but only if that's safe and loss-lessly possible
	21	- There's a "builder" for putting together objects easily in varargs function calls
	22	- There's a "dispatcher" for mapping objects to C data structures
	23	- Every variant optionally carries parsing location information, which simplifies debugging and parse log error generation
	24	- Formatter has color, line, column support
	25
	26	Limitations:
	27	- Doesn't allow embedded NUL in strings
	28	- Can't store integers outside of the -9223372036854775808…18446744073709551615 range (it will use 'long double' for
	29	values outside this range, which is lossy)
	30	- Can't store negative zero (will be treated identical to positive zero, and not retained across serialization)
	31	- Can't store non-integer numbers that can't be stored in "long double" losslessly
	32	- Allows creation and parsing of objects with duplicate keys. The "dispatcher" will refuse them however. This means
	33	we can parse and pass around such objects, but will carefully refuse them when we convert them into our own data.
	34
	35	(These limitations should be pretty much in line with those of other JSON implementations, in fact might be less
	36	limiting in most cases even.)
	37	*/
	38
	39	typedef struct JsonVariant JsonVariant;
	40
	41	typedef enum JsonVariantType {
	42	JSON_VARIANT_STRING,
	43	JSON_VARIANT_INTEGER,
	44	JSON_VARIANT_UNSIGNED,
	45	JSON_VARIANT_REAL,
	46	JSON_VARIANT_NUMBER, /* This a pseudo-type: we can never create variants of this type, but we use it as wildcard check for the above three types */
	47	JSON_VARIANT_BOOLEAN,
	48	JSON_VARIANT_ARRAY,
	49	JSON_VARIANT_OBJECT,
	50	JSON_VARIANT_NULL,
	51	_JSON_VARIANT_TYPE_MAX,
	52	_JSON_VARIANT_TYPE_INVALID = -1
	53	} JsonVariantType;
	54
	55	int json_variant_new_stringn(JsonVariant *ret, const char s, size_t n);
	56	int json_variant_new_integer(JsonVariant **ret, intmax_t i);
	57	int json_variant_new_unsigned(JsonVariant **ret, uintmax_t u);
	58	int json_variant_new_real(JsonVariant **ret, long double d);
	59	int json_variant_new_boolean(JsonVariant **ret, bool b);
	60	int json_variant_new_array(JsonVariant ret, JsonVariant array, size_t n);
	61	int json_variant_new_array_bytes(JsonVariant *ret, const void p, size_t n);
	62	int json_variant_new_array_strv(JsonVariant ret, char l);
	63	int json_variant_new_object(JsonVariant ret, JsonVariant array, size_t n);
	64	int json_variant_new_null(JsonVariant **ret);
	65
66	static inline int json_variant_new_string(JsonVariant *ret, const char s) {
67	return json_variant_new_stringn(ret, s, strlen_ptr(s));
68	}
69
70	JsonVariant json_variant_ref(JsonVariant v);
71	JsonVariant json_variant_unref(JsonVariant v);
72	void json_variant_unref_many(JsonVariant **array, size_t n);
73
74	DEFINE_TRIVIAL_CLEANUP_FUNC(JsonVariant *, json_variant_unref);
75
76	const char json_variant_string(JsonVariant v);
77	intmax_t json_variant_integer(JsonVariant *v);
78	uintmax_t json_variant_unsigned(JsonVariant *v);
79	long double json_variant_real(JsonVariant *v);
80	bool json_variant_boolean(JsonVariant *v);
81
82	JsonVariantType json_variant_type(JsonVariant *v);
83	bool json_variant_has_type(JsonVariant *v, JsonVariantType type);
84
85	static inline bool json_variant_is_string(JsonVariant *v) {
86	return json_variant_has_type(v, JSON_VARIANT_STRING);
87	}
88
89	static inline bool json_variant_is_integer(JsonVariant *v) {
90	return json_variant_has_type(v, JSON_VARIANT_INTEGER);
91	}
92
93	static inline bool json_variant_is_unsigned(JsonVariant *v) {
94	return json_variant_has_type(v, JSON_VARIANT_UNSIGNED);
95	}
96
97	static inline bool json_variant_is_real(JsonVariant *v) {
98	return json_variant_has_type(v, JSON_VARIANT_REAL);
99	}
100
101	static inline bool json_variant_is_number(JsonVariant *v) {
102	return json_variant_has_type(v, JSON_VARIANT_NUMBER);
103	}
104
105	static inline bool json_variant_is_boolean(JsonVariant *v) {
106	return json_variant_has_type(v, JSON_VARIANT_BOOLEAN);
107	}
108
109	static inline bool json_variant_is_array(JsonVariant *v) {
110	return json_variant_has_type(v, JSON_VARIANT_ARRAY);
111	}
112
113	static inline bool json_variant_is_object(JsonVariant *v) {
114	return json_variant_has_type(v, JSON_VARIANT_OBJECT);
115	}
116
117	static inline bool json_variant_is_null(JsonVariant *v) {
118	return json_variant_has_type(v, JSON_VARIANT_NULL);
119	}
120
121	bool json_variant_is_negative(JsonVariant *v);
122
123	size_t json_variant_elements(JsonVariant *v);
124	JsonVariant json_variant_by_index(JsonVariant v, size_t index);
125	JsonVariant json_variant_by_key(JsonVariant v, const char *key);
126	JsonVariant json_variant_by_key_full(JsonVariant v, const char key, JsonVariant *ret_key);
127
128	bool json_variant_equal(JsonVariant a, JsonVariant b);
129
130	struct json_variant_foreach_state {
131	JsonVariant *variant;
132	size_t idx;
133	};
134
135	#define JSON_VARIANT_ARRAY_FOREACH(i, v) \
136	for (struct json_variant_foreach_state _state = { (v), 0 }; \
137	_state.idx < json_variant_elements(_state.variant) && \
138	({ i = json_variant_by_index(_state.variant, _state.idx); \
139	true; }); \
140	_state.idx++)
141
142	#define JSON_VARIANT_OBJECT_FOREACH(k, e, v) \
143	for (struct json_variant_foreach_state _state = { (v), 0 }; \
144	_state.idx < json_variant_elements(_state.variant) && \
145	({ k = json_variant_by_index(_state.variant, _state.idx); \
146	e = json_variant_by_index(_state.variant, _state.idx + 1); \
147	true; }); \
148	_state.idx += 2)
149
150	int json_variant_get_source(JsonVariant v, const char ret_source, unsigned ret_line, unsigned *ret_column);
151
897f099b	152	typedef enum JsonFormatFlags {
ab91733c LP	153	JSON_FORMAT_NEWLINE = 1 << 0, /* suffix with newline */
	154	JSON_FORMAT_PRETTY = 1 << 1, /* add internal whitespace to appeal to human readers */
	155	JSON_FORMAT_COLOR = 1 << 2, /* insert ANSI color sequences */
6af022fe	156	JSON_FORMAT_COLOR_AUTO = 1 << 3, /* insert ANSI color sequences if colors_enabled() says so */
ab91733c LP	157	JSON_FORMAT_SOURCE = 1 << 4, /* prefix with source filename/line/column */
	158	JSON_FORMAT_SSE = 1 << 5, /* prefix/suffix with W3C server-sent events */
	159	JSON_FORMAT_SEQ = 1 << 6, /* prefix/suffix with RFC 7464 application/json-seq */
897f099b	160	} JsonFormatFlags;
cd0b6c53	161
897f099b LP	162	int json_variant_format(JsonVariant v, JsonFormatFlags flags, char *ret);
897f099b LP	163	void json_variant_dump(JsonVariant v, JsonFormatFlags flags, FILE f, const char *prefix);
cd0b6c53 LP	164
	165	int json_parse(const char string, JsonVariant ret, unsigned ret_line, unsigned *ret_column);
	166	int json_parse_continue(const char p, JsonVariant ret, unsigned ret_line, unsigned ret_column);
	167	int json_parse_file(FILE f, const char path, JsonVariant *ret, unsigned ret_line, unsigned *ret_column);
	168
	169	enum {
	170	_JSON_BUILD_STRING,
	171	_JSON_BUILD_INTEGER,
	172	_JSON_BUILD_UNSIGNED,
	173	_JSON_BUILD_REAL,
	174	_JSON_BUILD_BOOLEAN,
	175	_JSON_BUILD_ARRAY_BEGIN,
	176	_JSON_BUILD_ARRAY_END,
	177	_JSON_BUILD_OBJECT_BEGIN,
	178	_JSON_BUILD_OBJECT_END,
	179	_JSON_BUILD_PAIR,
319a4f27	180	_JSON_BUILD_PAIR_CONDITION,
cd0b6c53 LP	181	_JSON_BUILD_NULL,
	182	_JSON_BUILD_VARIANT,
	183	_JSON_BUILD_LITERAL,
	184	_JSON_BUILD_STRV,
	185	_JSON_BUILD_MAX,
	186	};
	187
	188	#define JSON_BUILD_STRING(s) _JSON_BUILD_STRING, ({ const char *_x = s; _x; })
	189	#define JSON_BUILD_INTEGER(i) _JSON_BUILD_INTEGER, ({ intmax_t _x = i; _x; })
	190	#define JSON_BUILD_UNSIGNED(u) _JSON_BUILD_UNSIGNED, ({ uintmax_t _x = u; _x; })
	191	#define JSON_BUILD_REAL(d) _JSON_BUILD_REAL, ({ long double _x = d; _x; })
	192	#define JSON_BUILD_BOOLEAN(b) _JSON_BUILD_BOOLEAN, ({ bool _x = b; _x; })
	193	#define JSON_BUILD_ARRAY(...) _JSON_BUILD_ARRAY_BEGIN, __VA_ARGS__, _JSON_BUILD_ARRAY_END
	194	#define JSON_BUILD_OBJECT(...) _JSON_BUILD_OBJECT_BEGIN, __VA_ARGS__, _JSON_BUILD_OBJECT_END
	195	#define JSON_BUILD_PAIR(n, ...) _JSON_BUILD_PAIR, ({ const char *_x = n; _x; }), __VA_ARGS__
319a4f27	196	#define JSON_BUILD_PAIR_CONDITION(c, n, ...) _JSON_BUILD_PAIR_CONDITION, ({ bool _x = c; _x; }), ({ const char *_x = n; _x; }), __VA_ARGS__
cd0b6c53 LP	197	#define JSON_BUILD_NULL _JSON_BUILD_NULL
	198	#define JSON_BUILD_VARIANT(v) _JSON_BUILD_VARIANT, ({ JsonVariant *_x = v; _x; })
	199	#define JSON_BUILD_LITERAL(l) _JSON_BUILD_LITERAL, ({ const char *_x = l; _x; })
	200	#define JSON_BUILD_STRV(l) _JSON_BUILD_STRV, ({ char **_x = l; _x; })
	201
	202	int json_build(JsonVariant **ret, ...);
	203	int json_buildv(JsonVariant **ret, va_list ap);
	204
	205	/* A bitmask of flags used by the dispatch logic. Note that this is a combined bit mask, that is generated from the bit
	206	* mask originally passed into json_dispatch(), the individual bitmask associated with the static JsonDispatch callout
	207	* entry, as well the bitmask specified for json_log() calls */
	208	typedef enum JsonDispatchFlags {
	209	/* The following three may be set in JsonDispatch's .flags field or the json_dispatch() flags parameter */
	210	JSON_PERMISSIVE = 1 << 0, /* Shall parsing errors be considered fatal for this property? */
	211	JSON_MANDATORY = 1 << 1, /* Should existance of this property be mandatory? */
	212	JSON_LOG = 1 << 2, /* Should the parser log about errors? */
	213
	214	/* The following two may be passed into log_json() in addition to the three above */
	215	JSON_DEBUG = 1 << 3, /* Indicates that this log message is a debug message */
	216	JSON_WARNING = 1 << 4, /* Indicates that this log message is a warning message */
	217	} JsonDispatchFlags;
	218
	219	typedef int (JsonDispatchCallback)(const char name, JsonVariant variant, JsonDispatchFlags flags, void userdata);
	220
	221	typedef struct JsonDispatch {
	222	const char *name;
	223	JsonVariantType type;
	224	JsonDispatchCallback callback;
	225	size_t offset;
	226	JsonDispatchFlags flags;
	227	} JsonDispatch;
	228
	229	int json_dispatch(JsonVariant v, const JsonDispatch table[], JsonDispatchCallback bad, JsonDispatchFlags flags, void userdata);
	230
	231	int json_dispatch_string(const char name, JsonVariant variant, JsonDispatchFlags flags, void *userdata);
	232	int json_dispatch_strv(const char name, JsonVariant variant, JsonDispatchFlags flags, void *userdata);
	233	int json_dispatch_boolean(const char name, JsonVariant variant, JsonDispatchFlags flags, void *userdata);
	234	int json_dispatch_tristate(const char name, JsonVariant variant, JsonDispatchFlags flags, void *userdata);
	235	int json_dispatch_variant(const char name, JsonVariant variant, JsonDispatchFlags flags, void *userdata);
	236	int json_dispatch_integer(const char name, JsonVariant variant, JsonDispatchFlags flags, void *userdata);
	237	int json_dispatch_unsigned(const char name, JsonVariant variant, JsonDispatchFlags flags, void *userdata);
	238	int json_dispatch_uint32(const char name, JsonVariant variant, JsonDispatchFlags flags, void *userdata);
	239	int json_dispatch_int32(const char name, JsonVariant variant, JsonDispatchFlags flags, void *userdata);
	240
	241	assert_cc(sizeof(uintmax_t) == sizeof(uint64_t))
	242	#define json_dispatch_uint64 json_dispatch_unsigned
	243
	244	assert_cc(sizeof(intmax_t) == sizeof(int64_t))
	245	#define json_dispatch_int64 json_dispatch_integer
	246
	247	static inline int json_dispatch_level(JsonDispatchFlags flags) {
	248
	249	/* Did the user request no logging? If so, then never log higher than LOG_DEBUG. Also, if this is marked as
	250	* debug message, then also log at debug level. */
	251
	252	if (!(flags & JSON_LOG) \|\|
	253	(flags & JSON_DEBUG))
	254	return LOG_DEBUG;
	255
	256	/* Are we invoked in permissive mode, or is this explicitly marked as warning message? Then this should be
	257	* printed at LOG_WARNING */
	258	if (flags & (JSON_PERMISSIVE\|JSON_WARNING))
	259	return LOG_WARNING;
	260
261	/* Otherwise it's an error. */
262	return LOG_ERR;
263	}
264
265	int json_log_internal(JsonVariant variant, int level, int error, const char file, int line, const char func, const char format, ...) _printf_(7, 8);
266
267	#define json_log(variant, flags, error, ...) \
268	({ \
269	int _level = json_dispatch_level(flags), _e = (error); \
270	(log_get_max_level() >= LOG_PRI(_level)) \
271	? json_log_internal(variant, _level, _e, __FILE__, __LINE__, __func__, __VA_ARGS__) \
272	: -abs(_e); \
273	})
274
d520d519 LP	275	#define JSON_VARIANT_STRING_CONST(x) _JSON_VARIANT_STRING_CONST(UNIQ, (x))
d520d519 LP	276
90b365ce	277	#define _JSON_VARIANT_STRING_CONST(xq, x) \
d520d519	278	({ \
90b365ce	279	_align_(2) static const char UNIQ_T(json_string_const, xq)[] = (x); \
d520d519 LP	280	assert((((uintptr_t) UNIQ_T(json_string_const, xq)) & 1) == 0); \
	281	(JsonVariant*) ((uintptr_t) UNIQ_T(json_string_const, xq) + 1); \
	282	})
	283
cd0b6c53 LP	284	const char *json_variant_type_to_string(JsonVariantType t);
cd0b6c53 LP	285	JsonVariantType json_variant_type_from_string(const char *s);