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Add a json_c_visit() function to provide a way to iterate over a tree of json-c objects.

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This commit is contained in:
Eric Haszlakiewicz
2016-10-29 15:01:20 -04:00
parent 7e12b9f47c
commit ecdc14f535
8 changed files with 410 additions and 4 deletions
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1
tests/Makefile.am
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@@ -22,6 +22,7 @@ TESTS+= test_printbuf.test
TESTS+= test_set_serializer.test
TESTS+= test_compare.test
TESTS+= test_set_value.test
TESTS+= test_visit.test
check_PROGRAMS=
check_PROGRAMS += $(TESTS:.test=)

111
tests/test_visit.c Normal file
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@@ -0,0 +1,111 @@
#include <stdio.h>
#include <stdlib.h>
#include <stddef.h>
#include <string.h>
#include <assert.h>
#include "json.h"
#include "json_tokener.h"
#include "json_visit.h"
static json_c_visit_userfunc emit_object;
static json_c_visit_userfunc skip_arrays;
static json_c_visit_userfunc pop_and_stop;
static json_c_visit_userfunc err_on_subobj2;
int main(void)
{
MC_SET_DEBUG(1);
const char *input = "{\
\"obj1\": 123,\
\"obj2\": {\
\"subobj1\": \"aaa\",\
\"subobj2\": \"bbb\",\
\"subobj3\": [ \"elem1\", \"elem2\", true ],\
},\
\"obj3\": 1.234,\
\"obj4\": [ true, false, null ]\
}";
json_object *jso = json_tokener_parse(input);
printf("jso.to_string()=%s\n", json_object_to_json_string(jso));
int rv;
rv = json_c_visit(jso, 0, emit_object, NULL);
printf("json_c_visit(emit_object)=%d\n", rv);
printf("================================\n\n");
rv = json_c_visit(jso, 0, skip_arrays, NULL);
printf("json_c_visit(skip_arrays)=%d\n", rv);
printf("================================\n\n");
rv = json_c_visit(jso, 0, pop_and_stop, NULL);
printf("json_c_visit(pop_and_stop)=%d\n", rv);
printf("================================\n\n");
rv = json_c_visit(jso, 0, err_on_subobj2, NULL);
printf("json_c_visit(err_on_subobj2)=%d\n", rv);
printf("================================\n\n");
json_object_put(jso);
}
static int emit_object(json_object *jso, int flags,
json_object *parent_jso,
const char *jso_key,
size_t *jso_index, void *userarg)
{
printf("flags: 0x%x, key: %s, index: %ld, value: %s\n",
flags,
(jso_key ? jso_key : "(null)"),
(jso_index ? (long)*jso_index : -1L),
json_object_to_json_string(jso));
return JSON_C_VISIT_RETURN_CONTINUE;
}
static int skip_arrays(json_object *jso, int flags,
json_object *parent_jso,
const char *jso_key,
size_t *jso_index, void *userarg)
{
(void)emit_object(jso, flags, parent_jso, jso_key, jso_index, userarg);
if (json_object_get_type(jso) == json_type_array)
return JSON_C_VISIT_RETURN_SKIP;
return JSON_C_VISIT_RETURN_CONTINUE;
}
static int pop_and_stop(json_object *jso, int flags,
json_object *parent_jso,
const char *jso_key,
size_t *jso_index, void *userarg)
{
(void)emit_object(jso, flags, parent_jso, jso_key, jso_index, userarg);
if (jso_key != NULL && strcmp(jso_key, "subobj1") == 0)
{
printf("POP after handling subobj1\n");
return JSON_C_VISIT_RETURN_POP;
}
if (jso_key != NULL && strcmp(jso_key, "obj3") == 0)
{
printf("STOP after handling obj3\n");
return JSON_C_VISIT_RETURN_STOP;
}
return JSON_C_VISIT_RETURN_CONTINUE;
}
static int err_on_subobj2(json_object *jso, int flags,
json_object *parent_jso,
const char *jso_key,
size_t *jso_index, void *userarg)
{
(void)emit_object(jso, flags, parent_jso, jso_key, jso_index, userarg);
if (jso_key != NULL && strcmp(jso_key, "subobj2") == 0)
{
printf("ERROR after handling subobj1\n");
return JSON_C_VISIT_RETURN_ERROR;
}
return JSON_C_VISIT_RETURN_CONTINUE;
}

55
tests/test_visit.expected Normal file
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@@ -0,0 +1,55 @@
jso.to_string()={ "obj1": 123, "obj2": { "subobj1": "aaa", "subobj2": "bbb", "subobj3": [ "elem1", "elem2", true ] }, "obj3": 1.234, "obj4": [ true, false, null ] }
flags: 0x0, key: (null), index: -1, value: { "obj1": 123, "obj2": { "subobj1": "aaa", "subobj2": "bbb", "subobj3": [ "elem1", "elem2", true ] }, "obj3": 1.234, "obj4": [ true, false, null ] }
flags: 0x0, key: obj1, index: -1, value: 123
flags: 0x0, key: obj2, index: -1, value: { "subobj1": "aaa", "subobj2": "bbb", "subobj3": [ "elem1", "elem2", true ] }
flags: 0x0, key: subobj1, index: -1, value: "aaa"
flags: 0x0, key: subobj2, index: -1, value: "bbb"
flags: 0x0, key: subobj3, index: -1, value: [ "elem1", "elem2", true ]
flags: 0x0, key: (null), index: 0, value: "elem1"
flags: 0x0, key: (null), index: 1, value: "elem2"
flags: 0x0, key: (null), index: 2, value: true
flags: 0x2, key: subobj3, index: -1, value: [ "elem1", "elem2", true ]
flags: 0x2, key: obj2, index: -1, value: { "subobj1": "aaa", "subobj2": "bbb", "subobj3": [ "elem1", "elem2", true ] }
flags: 0x0, key: obj3, index: -1, value: 1.234
flags: 0x0, key: obj4, index: -1, value: [ true, false, null ]
flags: 0x0, key: (null), index: 0, value: true
flags: 0x0, key: (null), index: 1, value: false
flags: 0x0, key: (null), index: 2, value: null
flags: 0x2, key: obj4, index: -1, value: [ true, false, null ]
flags: 0x2, key: (null), index: -1, value: { "obj1": 123, "obj2": { "subobj1": "aaa", "subobj2": "bbb", "subobj3": [ "elem1", "elem2", true ] }, "obj3": 1.234, "obj4": [ true, false, null ] }
json_c_visit(emit_object)=0
================================
flags: 0x0, key: (null), index: -1, value: { "obj1": 123, "obj2": { "subobj1": "aaa", "subobj2": "bbb", "subobj3": [ "elem1", "elem2", true ] }, "obj3": 1.234, "obj4": [ true, false, null ] }
flags: 0x0, key: obj1, index: -1, value: 123
flags: 0x0, key: obj2, index: -1, value: { "subobj1": "aaa", "subobj2": "bbb", "subobj3": [ "elem1", "elem2", true ] }
flags: 0x0, key: subobj1, index: -1, value: "aaa"
flags: 0x0, key: subobj2, index: -1, value: "bbb"
flags: 0x0, key: subobj3, index: -1, value: [ "elem1", "elem2", true ]
flags: 0x2, key: obj2, index: -1, value: { "subobj1": "aaa", "subobj2": "bbb", "subobj3": [ "elem1", "elem2", true ] }
flags: 0x0, key: obj3, index: -1, value: 1.234
flags: 0x0, key: obj4, index: -1, value: [ true, false, null ]
flags: 0x2, key: (null), index: -1, value: { "obj1": 123, "obj2": { "subobj1": "aaa", "subobj2": "bbb", "subobj3": [ "elem1", "elem2", true ] }, "obj3": 1.234, "obj4": [ true, false, null ] }
json_c_visit(skip_arrays)=0
================================
flags: 0x0, key: (null), index: -1, value: { "obj1": 123, "obj2": { "subobj1": "aaa", "subobj2": "bbb", "subobj3": [ "elem1", "elem2", true ] }, "obj3": 1.234, "obj4": [ true, false, null ] }
flags: 0x0, key: obj1, index: -1, value: 123
flags: 0x0, key: obj2, index: -1, value: { "subobj1": "aaa", "subobj2": "bbb", "subobj3": [ "elem1", "elem2", true ] }
flags: 0x0, key: subobj1, index: -1, value: "aaa"
POP after handling subobj1
flags: 0x2, key: obj2, index: -1, value: { "subobj1": "aaa", "subobj2": "bbb", "subobj3": [ "elem1", "elem2", true ] }
flags: 0x0, key: obj3, index: -1, value: 1.234
STOP after handling obj3
json_c_visit(pop_and_stop)=0
================================
flags: 0x0, key: (null), index: -1, value: { "obj1": 123, "obj2": { "subobj1": "aaa", "subobj2": "bbb", "subobj3": [ "elem1", "elem2", true ] }, "obj3": 1.234, "obj4": [ true, false, null ] }
flags: 0x0, key: obj1, index: -1, value: 123
flags: 0x0, key: obj2, index: -1, value: { "subobj1": "aaa", "subobj2": "bbb", "subobj3": [ "elem1", "elem2", true ] }
flags: 0x0, key: subobj1, index: -1, value: "aaa"
flags: 0x0, key: subobj2, index: -1, value: "bbb"
ERROR after handling subobj1
json_c_visit(err_on_subobj2)=-1
================================

12
tests/test_visit.test Executable file
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@@ -0,0 +1,12 @@
#!/bin/sh
# Common definitions
if test -z "$srcdir"; then
srcdir="${0%/*}"
test "$srcdir" = "$0" && srcdir=.
test -z "$srcdir" && srcdir=.
fi
. "$srcdir/test-defs.sh"
run_output_test test_visit
exit $?