ruby_string_to_rust_back_to_ruby.rs

extern crate rustc_serialize;
extern crate stringer;

use rustc_serialize::json::{self};
use std::collections::HashMap;
use std::ffi::CString;
use std::os::raw::c_char;
use stringer::*;

#[no_mangle]
pub extern fn read_json(ro: *const c_char) -> *const c_char {
    let roo                                 = make_string(ro);
    let json_for_rust: HashMap<String, i32> = json::decode(&roo).unwrap();
    let encoded                             = json::encode(&json_for_rust).unwrap();
    turn_into_null_string(encoded)
}

#[test]
fn it_reads_the_json() {
    let string   = CString::new("{\"wow\":\"6\"}").unwrap().into_raw();
    let ex_st    = "{\"wow\":\"6\"}".to_string();
    let exp      = turn_into_null_string(ex_st);

    let expected1  = make_string(exp);
    let expected2  = make_string(read_json(string));

    assert_eq!(expected1, "{\"wow\":\"6\"}");
    assert_eq!(expected2, "{\"wow\":6}");
}