JSON* GetItemInJSON(JSON *json, const char *path)
{
JSON *rtn = NULL;
JSON *next_json = NULL;
if (path[0] != '/') {
printf("Exception: Invalid path format.\n");
return NULL;
}
if (strcmp("/", path) == 0) {
return json;
}
char *sub_s = GetSubString(path, 1, strlen(path) - 1);
char *next_slash = strchr(sub_s, '/');
if (next_slash == NULL) {
switch (json->type) {
case JSON_ARRAY: rtn = GetItemInArray(json, atoi(sub_s)); break;
case JSON_OBJECT: rtn = GetItemInObject(json, sub_s); break;
}
free(sub_s);
return rtn;
}
else {
char *search_item_key = GetSubString(sub_s, 0, next_slash - sub_s);
char *search_item_path = GetSubString(next_slash, 0, strlen(next_slash));
switch (json->type) {
case JSON_ARRAY:
next_json = GetItemInArray(json, atoi(search_item_key));
case JSON_OBJECT:
next_json = GetItemInObject(json, search_item_key);
}
rtn = GetItemInJSON(next_json, search_item_path);
free(search_item_key);
free(search_item_path);
free(sub_s);
return rtn;
}
return NULL;
}
int TestSomeFuncs() {
int score = 10;
// 调用同学们实现的接口
JSON *root = CreateObject();
// 评测1 是否能正确创建Object
if (root->type != JSON_OBJECT) { // 类型不对
score -= 2;
}
AddItemToObject(root, "name", CreateString("Hello World"));
// 评测2 是否能正确AddItemToObject并且读取
JSON *value = GetItemInObject(root, "name");
// 类型不对或者值不对
if (value->type != JSON_STRING || strcmp(value->valuestring, "Hello World")) {
score -= 2;
}
JSON *array = CreateArray();
AddItemToArray(array, CreateBool(0));
AddItemToArray(array, CreateNumber(2.3));
// 评测3 是否能正确AddItemToArray并且读取
JSON *item = GetItemInArray(array, 1);
if (item->type != JSON_NUMBER || item->valuedouble != 2.3) {
score -= 2;
}
AddItemToObject(root, "array", courses);
// 现在root的状态
/*
{
"name": "Hello Wrold",
"array": [
false,
2.3
]
}
*/
// 评测4 是否能正确地根据路径读取值
item = GetItemInJSON(root, "/array/0");
if (item->type != JSON_FALSE) {
score -= 2;
}
PrintJSONToFile(root, "test.json");
// 评测5 是否与标准答案文件相同
if (!IsSame("test.json", "test.json.ans")) {
score -= 2;
}
return score;
}
JSON *__GetItemInJSON(JSON *object, char *key){
if (object==NULL) return NULL; // fail
if (key == NULL|| *key == 0) return object;
else if (object->type == JSON_ARRAY){
int which = 0;
char *pos = key+1;
while (*pos != 0&& *pos != '/'){
which = which*10 + *pos-'0';
++pos;
}
return __GetItemInJSON(GetItemInArray(object, which), pos);
}
else if (object->type == JSON_OBJECT){
char *op = key+1, *ed = op;
for( ; *ed != 0&& *ed != '/'; ++ed);
char *query_string = (char*)calloc(ed-op+1, sizeof(char));
memcpy(query_string, op, sizeof(char)*(ed-op));
return __GetItemInJSON(GetItemInObject(object, query_string), ed);
}
else
return NULL;
}
