JSONドキュメントへのアクセス

// Get the root value of this JSON document.
yyjson_val *yyjson_doc_get_root(const yyjson_doc *doc);

// Get how many bytes are read when parsing JSON.
// e.g. "[1,2,3]" returns 7.
size_t yyjson_doc_get_read_size(const yyjson_doc *doc);

// Get total value count in this JSON document.
// e.g. "[1,2,3]" returns 4 (1 array and 3 numbers).
size_t yyjson_doc_get_val_count(const yyjson_doc *doc);

// Free the document; if NULL is passed in, do nothing.
void yyjson_doc_free(yyjson_doc *doc);

// Returns the type and subtype of a JSON value.
// Returns 0 if `val` is NULL.
yyjson_type yyjson_get_type(const yyjson_val *val);
yyjson_subtype yyjson_get_subtype(const yyjson_val *val);

// Returns value's tag, see `Data Structures` doc for details.
uint8_t yyjson_get_tag(const yyjson_val *val);

// returns type description, such as:  
// "null", "string", "array", "object", "true", "false",
// "uint", "sint", "real", "unknown"
const char *yyjson_get_type_desc(const yyjson_val *val);

// Returns true if the JSON value is specified type.
// Returns false if `val` is NULL or type does not match.
bool yyjson_is_null(const yyjson_val *val);  // null
bool yyjson_is_true(const yyjson_val *val);  // true
bool yyjson_is_false(const yyjson_val *val); // false
bool yyjson_is_bool(const yyjson_val *val);  // true/false
bool yyjson_is_uint(const yyjson_val *val);  // uint64_t
bool yyjson_is_sint(const yyjson_val *val);  // int64_t
bool yyjson_is_int(const yyjson_val *val);   // uint64_t/int64_t
bool yyjson_is_real(const yyjson_val *val);  // double
bool yyjson_is_num(const yyjson_val *val);   // uint64_t/int64_t/double
bool yyjson_is_str(const yyjson_val *val);   // string
bool yyjson_is_arr(const yyjson_val *val);   // array
bool yyjson_is_obj(const yyjson_val *val);   // object
bool yyjson_is_ctn(const yyjson_val *val);   // array/object
bool yyjson_is_raw(const yyjson_val *val);   // raw string

// Returns the raw string, or NULL if `val` is not raw type.
const char *yyjson_get_raw(const yyjson_val *val);

// Returns bool value, or false if `val` is not bool type.
bool yyjson_get_bool(const yyjson_val *val);

// Returns uint64_t value (cast), or 0 if `val` is not uint/sint type.
uint64_t yyjson_get_uint(const yyjson_val *val);

// Returns int64_t value (cast), or 0 if `val` is not uint/sint type.
int64_t yyjson_get_sint(const yyjson_val *val);

// Returns int value (cast, may overflow), or 0 if `val` is not uint/sint type.
int yyjson_get_int(const yyjson_val *val);

// Returns double value, or 0 if `val` is not real type.
double yyjson_get_real(const yyjson_val *val);

// Returns double value (cast), or 0 if `val` is not uint/sint/real type.
double yyjson_get_num(const yyjson_val *val);

// Returns the string value, or NULL if `val` is not string type.
const char *yyjson_get_str(const yyjson_val *val);

// Returns the content length for raw/string/array/object values.
// Returns 0 if `val` is NULL. The return value is unspecified for other types.
size_t yyjson_get_len(const yyjson_val *val);

// Returns whether the value is equal to a string.
// Returns false if `val` is NULL or is not string.
bool yyjson_equals_str(const yyjson_val *val, const char *str);
bool yyjson_equals_strn(const yyjson_val *val, const char *str, size_t len);

// Returns whether two JSON values are equal (deep compare).
// Returns false if `lhs` or `rhs` is NULL.
// Note: result may be inaccurate if an object has duplicate keys.
// Warning: this function is recursive and may cause a stack overflow
//          if the object/array nesting level is too deep.
bool yyjson_equals(const yyjson_val *lhs, const yyjson_val *rhs);
bool yyjson_mut_equals(const yyjson_mut_val *lhs, const yyjson_mut_val *rhs);

// Set the value to new type and content.
// Returns false if `val` is NULL or is object or array.
bool yyjson_set_raw(yyjson_val *val, const char *raw, size_t len);
bool yyjson_set_null(yyjson_val *val);
bool yyjson_set_bool(yyjson_val *val, bool num);
bool yyjson_set_uint(yyjson_val *val, uint64_t num);
bool yyjson_set_sint(yyjson_val *val, int64_t num);
bool yyjson_set_int(yyjson_val *val, int64_t num);
bool yyjson_set_float(yyjson_val *val, float num);
bool yyjson_set_double(yyjson_val *val, double num);
bool yyjson_set_real(yyjson_val *val, double num);

// The string is not copied, should be held by caller.
bool yyjson_set_str(yyjson_val *val, const char *str);
bool yyjson_set_strn(yyjson_val *val, const char *str, size_t len);

// Returns the number of elements in this array.
// Returns 0 if `arr` is NULL or is not an array.
size_t yyjson_arr_size(const yyjson_val *arr);

// Returns the element at the specified position (linear search time).
// Returns NULL if `arr` is NULL, is not an array, or `idx` is out of bounds.
yyjson_val *yyjson_arr_get(const yyjson_val *arr, size_t idx);

// Returns the first element of this array (constant time).
// Returns NULL if `arr` is NULL, is not an array, or is empty.
yyjson_val *yyjson_arr_get_first(const yyjson_val *arr);

// Returns the last element of this array (linear search time).
// Returns NULL if `arr` is NULL, is not an array, or is empty.
yyjson_val *yyjson_arr_get_last(const yyjson_val *arr);

yyjson_val *arr; // the array to be traversed

yyjson_val *val;
yyjson_arr_iter iter = yyjson_arr_iter_with(arr);
while ((val = yyjson_arr_iter_next(&iter))) {
    your_func(val);
}

yyjson_val *arr; // the array to be traversed

size_t idx, max;
yyjson_val *val;
yyjson_arr_foreach(arr, idx, max, val) {
    your_func(idx, val);
}

yyjson_mut_val *arr; // the array to be traversed

yyjson_mut_val *val;
yyjson_mut_arr_iter iter = yyjson_mut_arr_iter_with(arr);
while ((val = yyjson_mut_arr_iter_next(&iter))) {
    if (your_val_is_unused(val)) {
        // you can remove current value inside iteration
        yyjson_mut_arr_iter_remove(&iter); 
    }
}

yyjson_mut_val *arr; // the array to be traversed

size_t idx, max;
yyjson_mut_val *val;
yyjson_mut_arr_foreach(arr, idx, max, val) {
    your_func(idx, val);
}

// Returns the number of key-value pairs in this object.
// Returns 0 if `obj` is NULL or is not an object.
size_t yyjson_obj_size(const yyjson_val *obj);

// Returns the value to which the specified key is mapped.
// Returns NULL if this object contains no mapping for the key.
yyjson_val *yyjson_obj_get(const yyjson_val *obj, const char *key);
yyjson_val *yyjson_obj_getn(const yyjson_val *obj, const char *key, size_t key_len);

// If the order of the object's keys is known at compile-time,
// you can use this method to avoid searching the entire object.
// e.g. { "x":1, "y":2, "z":3 }
yyjson_val *obj = ...;
yyjson_obj_iter iter = yyjson_obj_iter_with(obj);

yyjson_val *x = yyjson_obj_iter_get(&iter, "x");
yyjson_val *z = yyjson_obj_iter_get(&iter, "z");

yyjson_val *obj; // the object to be traversed

yyjson_val *key, *val;
yyjson_obj_iter iter = yyjson_obj_iter_with(obj);
while ((key = yyjson_obj_iter_next(&iter))) {
    val = yyjson_obj_iter_get_val(key);
    your_func(key, val);
}

yyjson_val *obj; // this is your object

size_t idx, max;
yyjson_val *key, *val;
yyjson_obj_foreach(obj, idx, max, key, val) {
    your_func(key, val);
}

yyjson_mut_val *obj; // the object to be traversed

yyjson_mut_val *key, *val;
yyjson_mut_obj_iter iter = yyjson_mut_obj_iter_with(obj);
while ((key = yyjson_mut_obj_iter_next(&iter))) {
    val = yyjson_mut_obj_iter_get_val(key);
    if (your_key_is_unused(key)) {
        // you can remove current kv pair inside iteration
        yyjson_mut_obj_iter_remove(&iter);
    }
}

yyjson_mut_val *obj; // the object to be traversed

size_t idx, max;
yyjson_mut_val *key, *val;
yyjson_mut_obj_foreach(obj, idx, max, key, val) {
    your_func(key, val);
}