102 строки
3.1 KiB
C
102 строки
3.1 KiB
C
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#ifndef _json_c_json_visit_h_
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#define _json_c_json_visit_h_
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/**
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* @file
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* @brief Methods for walking a tree of objects.
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*/
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#include "json_object.h"
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#ifdef __cplusplus
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extern "C" {
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#endif
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typedef int(json_c_visit_userfunc)(json_object *jso, int flags, json_object *parent_jso,
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const char *jso_key, size_t *jso_index, void *userarg);
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/**
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* Visit each object in the JSON hierarchy starting at jso.
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* For each object, userfunc is called, passing the object and userarg.
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* If the object has a parent (i.e. anything other than jso itself)
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* its parent will be passed as parent_jso, and either jso_key or jso_index
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* will be set, depending on whether the parent is an object or an array.
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*
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* Nodes will be visited depth first, but containers (arrays and objects)
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* will be visited twice, the second time with JSON_C_VISIT_SECOND set in
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* flags.
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*
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* userfunc must return one of the defined return values, to indicate
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* whether and how to continue visiting nodes, or one of various ways to stop.
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*
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* Returns 0 if nodes were visited successfully, even if some were
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* intentionally skipped due to what userfunc returned.
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* Returns <0 if an error occurred during iteration, including if
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* userfunc returned JSON_C_VISIT_RETURN_ERROR.
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*/
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JSON_EXPORT int json_c_visit(json_object *jso, int future_flags, json_c_visit_userfunc *userfunc,
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void *userarg);
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/**
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* Passed to json_c_visit_userfunc as one of the flags values to indicate
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* that this is the second time a container (array or object) is being
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* called, after all of it's members have been iterated over.
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*/
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#define JSON_C_VISIT_SECOND 0x02
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/**
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* This json_c_visit_userfunc return value indicates that iteration
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* should proceed normally.
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*/
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#define JSON_C_VISIT_RETURN_CONTINUE 0
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/**
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* This json_c_visit_userfunc return value indicates that iteration
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* over the members of the current object should be skipped.
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* If the current object isn't a container (array or object), this
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* is no different than JSON_C_VISIT_RETURN_CONTINUE.
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*/
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#define JSON_C_VISIT_RETURN_SKIP 7547
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/**
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* This json_c_visit_userfunc return value indicates that iteration
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* of the fields/elements of the <b>containing</b> object should stop
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* and continue "popped up" a level of the object hierarchy.
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* For example, returning this when handling arg will result in
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* arg3 and any other fields being skipped. The next call to userfunc
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* will be the JSON_C_VISIT_SECOND call on "foo", followed by a userfunc
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* call on "bar".
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* <pre>
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* {
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* "foo": {
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* "arg1": 1,
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* "arg2": 2,
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* "arg3": 3,
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* ...
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* },
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* "bar": {
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* ...
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* }
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* }
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* </pre>
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*/
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#define JSON_C_VISIT_RETURN_POP 767
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/**
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* This json_c_visit_userfunc return value indicates that iteration
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* should stop immediately, and cause json_c_visit to return success.
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*/
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#define JSON_C_VISIT_RETURN_STOP 7867
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/**
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* This json_c_visit_userfunc return value indicates that iteration
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* should stop immediately, and cause json_c_visit to return an error.
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*/
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#define JSON_C_VISIT_RETURN_ERROR -1
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#ifdef __cplusplus
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}
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#endif
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#endif /* _json_c_json_visit_h_ */
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