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/*
* Copyright (C) 2016-2019 "IoT.bzh"
* Author José Bollo <jose.bollo@iot.bzh>
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
/*
* This simple program expands the object { "$ref": "#/path/to/a/target" }
*
* For example:
*
* {
* "type":{
* "a": "int",
* "b": { "$ref": "#/type/a" }
* }
* }
*
* will be exapanded to
*
* {
* "type":{
* "a": "int",
* "b": "int"
* }
* }
*
* Invocation: program [file|-]...
*
* without arguments, it reads the input.
*/
#define _GNU_SOURCE
#include <string.h>
#include <stdio.h>
#include <json-c/json.h>
#include "getref.h"
#include "exprefs.h"
/**
* records path to the expanded node
*/
struct path
{
struct json_object *object; /**< node being expanded */
const struct path *upper; /**< link to upper expanded nodes */
};
/**
* Returns the top object
*/
static inline struct json_object *top(const struct path *path)
{
while (path->upper)
path = path->upper;
return path->object;
}
/**
* Expands the node designated by path and returns its expanded form
*/
static struct json_object *expand(const struct path *upper)
{
struct path here;
struct json_object *object, *x;
int n, i;
struct json_object_iterator ji, jn;
/* expansion depends of the type of the node */
here.upper = upper;
object = upper->object;
switch (json_object_get_type(object)) {
case json_type_object:
/* for object, look if it contains a property "$ref" */
if (json_object_object_get_ex(object, "$ref", &here.object)) {
/* check that "$ref" value is a string */
if (!json_object_is_type(here.object, json_type_string)) {
fprintf(stderr, "found a $ref not being string. Is: %s\n", json_object_get_string(here.object));
exit(1);
}
/* yes, reference, try to substitute its target */
i = search$ref(top(upper), json_object_get_string(here.object), &x);
if (!i) {
fprintf(stderr, "$ref not found. Was: %s\n", json_object_get_string(here.object));
exit(1);
}
/* check not recursive */
upper = &here;
while(upper) {
if (x == upper->object) {
fprintf(stderr, "$ref recursive. Was: %s\n", json_object_get_string(here.object));
exit(1);
}
upper = upper->upper;
}
/* found. return a new instance of the target */
return x;
}
/* no, expand the values */
ji = json_object_iter_begin(object);
jn = json_object_iter_end(object);
while (!json_object_iter_equal(&ji, &jn)) {
here.object = json_object_iter_peek_value(&ji);
x = expand(&here);
if (x != here.object)
json_object_object_add(object, json_object_iter_peek_name(&ji), json_object_get(x));
json_object_iter_next(&ji);
}
break;
case json_type_array:
/* expand the values of arrays */
i = 0;
n = (int)json_object_array_length(object);
while (i != n) {
here.object = json_object_array_get_idx(object, i);
x = expand(&here);
if (x != here.object)
json_object_array_put_idx(object, i, json_object_get(x));
i++;
}
break;
default:
/* otherwise no expansion */
break;
}
/* return the given node */
return object;
}
struct json_object *exp$refs(struct json_object *root)
{
struct path top = { .object = root, .upper = NULL };
return expand(&top);
}
static int is_tree(struct json_object *object, const struct path *upper)
{
struct path here;
int n, i;
struct json_object_iterator ji, jn;
switch (json_object_get_type(object)) {
case json_type_object:
case json_type_array:
/* check recursive */
here.upper = upper;
while (upper) {
if (upper->object == object)
return 0;
upper = upper->upper;
}
here.object = object;
switch (json_object_get_type(object)) {
case json_type_object:
ji = json_object_iter_begin(object);
jn = json_object_iter_end(object);
while (!json_object_iter_equal(&ji, &jn)) {
if (!is_tree(json_object_iter_peek_value(&ji), &here))
return 0;
json_object_iter_next(&ji);
}
break;
case json_type_array:
i = 0;
n = (int)json_object_array_length(object);
while (i != n) {
if (!is_tree(json_object_array_get_idx(object, i), &here))
return 0;
i++;
}
break;
default:
break;
}
break;
default:
break;
}
return 1;
}
int exp$refs_is_tree(struct json_object *root)
{
return is_tree(root, NULL);
}
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