# Jsonpath Library
[JsonPath](https://goessner.net/articles/JsonPath/) Rust 구현
## 왜?
To enjoy Rust
## 사용법
## With Javascript (WebAssembly)
#### `jsonpath-wasm` 라이브리러
*(not yet published `jsonpath-wasm`)*
```javascript
import * as jsonpath from "jsonpath-wasm";
```
#### `read` 함수
```
jsonpath.read(JSON.parse("{\"a\" : 1}"), "$.a");
jsonpath.read("{\"a\" : 1}", "$.a");
```
#### JsonPath 재사용
```
let template = jsonpath.compile("$.a");
//
// 1. read json string
//
template("{\"a\" : 1}")
//
// 2. read as json object
//
template(JSON.parse("{\"a\" : 1}"));
```
#### Json 재사용
```
//
// 1. read json string
//
let reader1 = jsonpath.reader("{\"a\" : 1}");
reader1("$.a");
reader1("$.b");
//
// 2. read as json object
//
let reader2 = jsonpath.reader(JSON.parse("{\"a\" : 1}"));
reader2("$.a");
reader2("$.b");
```
### 데모
**Demo**: https://freestrings.github.io/jsonpath/
json 데이터 *(참고 사이트: https://github.com/json-path/JsonPath)*
```javascript
{
"store": {
"book": [
{
"category": "reference",
"author": "Nigel Rees",
"title": "Sayings of the Century",
"price": 8.95
},
{
"category": "fiction",
"author": "Evelyn Waugh",
"title": "Sword of Honour",
"price": 12.99
},
{
"category": "fiction",
"author": "Herman Melville",
"title": "Moby Dick",
"isbn": "0-553-21311-3",
"price": 8.99
},
{
"category": "fiction",
"author": "J. R. R. Tolkien",
"title": "The Lord of the Rings",
"isbn": "0-395-19395-8",
"price": 22.99
}
],
"bicycle": {
"color": "red",
"price": 19.95
}
},
"expensive": 10
}
```
| JsonPath (click link to try)| Result |
| :------- | :----- |
| $.store.book[*].author| The authors of all books |
| $..author | All authors |
| $.store.* | All things, both books and bicycles |
| $.store..price | The price of everything |
| $..book[2] | The third book |
| $..book[-2] | The second to last book |
| $..book[0,1] | The first two books |
| $..book[:2] | All books from index 0 (inclusive) until index 2 (exclusive) |
| $..book[1:2] | All books from index 1 (inclusive) until index 2 (exclusive) |
| $..book[-2:] | Last two books |
| $..book[2:] | Book number two from tail |
| $..book[?(@.isbn)] | All books with an ISBN number |
| $.store.book[?(@.price < 10)] | All books in store cheaper than 10 |
| $..* | Give me every thing
| $..book[?((@.price == 12.99 | | $.store.bicycle.price < @.price) || @.category == "reference")] | Complex filter
## With Rust (as library)
-
## With AWS API Gateway
-
# 성능테스트