rust_json

学习 rust 所写的 JSON 解析与序列化工具。 JSON serializer and deserializer written for learning rust.

解析的编写参考了 miloyip 的 json-tutorial。 Parser is learned from miloyip's json-tutorial.

Rust 宏的编写参考了 Serde JSON。 Marco is learned from Serde JSON.

功能 / Feature

从字符串解析 json / Parse json from string

use rust_json::json_parse;

fn example() {
    let j = json_parse(r#"
    {
        "S": [
            1, 
            2.3, 
            {
                "4": {
                    "5": {
                        "6": [
                            null,
                            true, 
                            false
                            ]
                        }
                    }
            }
        ]
    }"#);

    println!("{}", j["S"]);
}

以 json 的风格构造 JsonElem / Construct JsonElem with json literal

use rust_json::json;

fn example() {
    let j = json!(
        {
            "S": [
                1.2, 
                "2.3", 
                {
                    "4": {
                        "5": {
                            "6": [
                                null,
                                true, 
                                false
                                ]
                            }
                        }
                }
            ]
        }
    );

    println!("{}", j["S"]);
}

以 js 的风格构造 JsonElem / Construct JsonElem with js object literal style

use rust_json::js_object;

fn proc(n: i32) -> i32 {
    n * n + n / 2
}

fn main() {
    let a = true;
    let n = 32;
    let j = js_object!([
        {
            a // 属性的简洁表示 Property Shorthand
        },
        {
            // 使用表达式作为值 Using expression
            proc_n: if n % 2 == 0 { proc(n) + 1 } else { 0 }, 
            [n * 12]: n * 12 // 属性名表达式 Computed Property Names
        }
    ]);
    println!("{}", j);
}

`#[derive(ToJson)]`

use rust_json::ToJson;
use rust_json_derive::ToJson;

#[derive(ToJson)]
struct Simple {
    n: f64,
    b: bool,
}

#[derive(ToJson)]
struct Nest {
    a: Vec<f64>,
    s: Simple,
}

#[derive(ToJson)]
enum Enum {
    Unit,
    One(i32),
    Two(i32, i32),
    Cmpx { a: i32, b: i32, c: i32 },
}

fn main() {
    let s = Simple { n: 12.3, b: true };
    println!("{}", s.to_json());

    let n = Nest {
        a: vec![1.2, 2.3],
        s: s,
    };
    println!("{}", n.to_json());

    let u = E::Unit;
    let o = E::One(1);
    let t = E::Two(1, 2);
    let c = E::Cmpx { a: 1, b: 2, c: 3 };
    println!("{}", u.to_json());
    println!("{}", o.to_json());
    println!("{}", t.to_json());
    println!("{}", c.to_json());
}

`#[derive(FromJson)]`

use rust_json::json_parse;
use rust_json_derive::FromJson;

#[derive(Debug, FromJson)]
struct Simple {
    n: f64,
    b: bool,
}

#[derive(Debug, FromJson)]
struct Nest {
    a: Vec<f64>,
    s: Simple,
}

#[derive(Debug, FromJson)]
enum Enum {
    Unit,
    One(i32),
    Two(i32, i32),
    Cmpx { a: i32, b: i32, c: i32 },
}

fn main() {
    println!("{:?}", json_parse(r#"{"n": 12.3, "b": true}"#).get::<Simple>());

    println!("{:?}", json_parse(r#"
    {
        "a": [1.2, 2.3],
        "s": {"n": 12.3, "b": true}
    }
    "#).get::<Nest>());

    println!("{:?}", json_parse(r#""Unit""#).get::<Enum>());
    
    println!("{:?}", json_parse(r#"{"One": 1}"#).get::<Enum>());

    println!("{:?}", json_parse(r#"
    {
        "Two": [1, 2]
    }
    "#).get::<Enum>());

    println!("{:?}", json_parse(r#"
    {
        "Cmpx": {"a": 1, "b": 2, "c": 3}
    }
    "#).get::<Enum>());
}