2 #ifndef _json_c_json_visit_h_
3 #define _json_c_json_visit_h_
7 * @brief Methods for walking a tree of objects.
9 #include "json_object.h"
15 typedef int(json_c_visit_userfunc)(json_object *jso, int flags, json_object *parent_jso,
16 const char *jso_key, size_t *jso_index, void *userarg);
19 * Visit each object in the JSON hierarchy starting at jso.
20 * For each object, userfunc is called, passing the object and userarg.
21 * If the object has a parent (i.e. anything other than jso itself)
22 * its parent will be passed as parent_jso, and either jso_key or jso_index
23 * will be set, depending on whether the parent is an object or an array.
25 * Nodes will be visited depth first, but containers (arrays and objects)
26 * will be visited twice, the second time with JSON_C_VISIT_SECOND set in
29 * userfunc must return one of the defined return values, to indicate
30 * whether and how to continue visiting nodes, or one of various ways to stop.
32 * Returns 0 if nodes were visited successfully, even if some were
33 * intentionally skipped due to what userfunc returned.
34 * Returns <0 if an error occurred during iteration, including if
35 * userfunc returned JSON_C_VISIT_RETURN_ERROR.
37 JSON_EXPORT int json_c_visit(json_object *jso, int future_flags, json_c_visit_userfunc *userfunc,
41 * Passed to json_c_visit_userfunc as one of the flags values to indicate
42 * that this is the second time a container (array or object) is being
43 * called, after all of it's members have been iterated over.
45 #define JSON_C_VISIT_SECOND 0x02
48 * This json_c_visit_userfunc return value indicates that iteration
49 * should proceed normally.
51 #define JSON_C_VISIT_RETURN_CONTINUE 0
54 * This json_c_visit_userfunc return value indicates that iteration
55 * over the members of the current object should be skipped.
56 * If the current object isn't a container (array or object), this
57 * is no different than JSON_C_VISIT_RETURN_CONTINUE.
59 #define JSON_C_VISIT_RETURN_SKIP 7547
62 * This json_c_visit_userfunc return value indicates that iteration
63 * of the fields/elements of the <b>containing</b> object should stop
64 * and continue "popped up" a level of the object hierarchy.
65 * For example, returning this when handling arg will result in
66 * arg3 and any other fields being skipped. The next call to userfunc
67 * will be the JSON_C_VISIT_SECOND call on "foo", followed by a userfunc
83 #define JSON_C_VISIT_RETURN_POP 767
86 * This json_c_visit_userfunc return value indicates that iteration
87 * should stop immediately, and cause json_c_visit to return success.
89 #define JSON_C_VISIT_RETURN_STOP 7867
92 * This json_c_visit_userfunc return value indicates that iteration
93 * should stop immediately, and cause json_c_visit to return an error.
95 #define JSON_C_VISIT_RETURN_ERROR -1
101 #endif /* _json_c_json_visit_h_ */