Gist test

gist.md

##About Parson is a lighweight json library written in C. This is a version in development (hence -devel suffix), it contains some features parson lacks, but API can and probably will change in future.

##Features

• Full JSON support
• Lightweight (only 2 files)
• Simple API
• Addressing json values with dot notation (similiar to C structs or objects in most OO languages, e.g. "objectA.objectB.value")
• C89 compatible
• Test suites

##Installation Run the following code:

git clone https://github.com/kgabis/parson.git

and copy parson.h and parson.c to you source code tree.

Run make test to compile and run tests.

##Parsing JSON Here is a function, which prints basic commit info (date, sha and author) from a github repository. It's also included in tests.c file, you can just uncomment and run it.

void print_commits_info(const char *username, const char *repo) {
    JSON_Value *root_value;
    JSON_Array *commits;
    JSON_Object *commit;
    size_t i;
    
    char curl_command[512];
    char cleanup_command[256];
    char output_filename[] = "commits.json";
    
    /* it ain't pretty, but it's not a libcurl tutorial */
    sprintf(curl_command, 
        "curl -s \"https://api.github.com/repos/%s/%s/commits\" > %s",
        username, repo, output_filename);
    sprintf(cleanup_command, "rm -f %s", output_filename);
    system(curl_command);
    
    /* parsing json and validating output */
    root_value = json_parse_file(output_filename);
    if (json_value_get_type(root_value) != JSONArray) {
        system(cleanup_command);
        return;
    }
    
    /* getting array from root value and printing commit info */
    commits = json_value_get_array(root_value);
    printf("%-10.10s %-10.10s %s\n", "Date", "SHA", "Author");
    for (i = 0; i < json_array_get_count(commits); i++) {
        commit = json_array_get_object(commits, i);
        printf("%.10s %.10s %s\n",
               json_object_dotget_string(commit, "commit.author.date"),
               json_object_get_string(commit, "sha"),
               json_object_dotget_string(commit, "commit.author.name"));
    }
    
    /* cleanup code */
    json_value_free(root_value);
    system(cleanup_command);
}

Calling print_commits_info("torvalds", "linux"); prints:

Date       SHA        Author
2012-10-15 dd8e8c4a2c David Rientjes
2012-10-15 3ce9e53e78 Michal Marek
2012-10-14 29bb4cc5e0 Randy Dunlap
2012-10-15 325adeb55e Ralf Baechle
2012-10-14 68687c842c Russell King
2012-10-14 ddffeb8c4d Linus Torvalds
...

##Creating JSON values in code Creating JSON values is very simple thanks to the dot notation. Object hierarchy is automatically created when addressing specific fields. In the following example I create a simple JSON value containing basic information about a person.

    JSON_Value *root_value = json_value_init_object();
    JSON_Object *root_object = json_value_get_object(root_value);
    json_object_set(root_object, "name", json_value_init_string("John Smith"));
    json_object_set(root_object, "age", json_value_init_number(25));
    json_object_dotset(root_object, "address.city", json_value_init_string("Cupertino"));
    json_object_dotset(root_object, "contact.emails", json_parse_string("[\"email@example.com\", \"email2@example.com\"]"));
    puts(json_serialize(root_value));

Created value (after formatting outside parson):

{  
   "name":"John Smith",
   "age":25.000000,
   "address":{  
      "city":"Cupertino"
   },
   "contact":{  
      "emails":[  
         "email@example.com",
         "email2@example.com"
      ]
   }
}

##License The MIT License (MIT)