# jsonpath-lib
[](https://travis-ci.org/freestrings/jsonpath)

`Rust` 버전 [JsonPath](https://goessner.net/articles/JsonPath/) 구현이다. Rust 구현과 동일한 기능을 `Webassembly` 로 제공하는 것도 목표.
The `Rust` version is a [JsonPath](https://goessner.net/articles/JsonPath/) implementation. It is also aimed to provide the same functionality as `Webassembly` in Rust implementation.
## 왜?
To enjoy Rust!
## 목차
[With Javascript (Webassembly)](#with-javascript-webassembly)
- [jsonpath-wasm library](#jsonpath-wasm-library)
- [javascript - jsonpath.select(json: string|object, jsonpath: string)](#javascript---jsonpathselectjson-stringobject-jsonpath-string)
- [javascript - jsonpath.compile(jsonpath: string)](#javascript---jsonpathcompilejsonpath-string)
- [javascript - jsonpath.selector(json: string|object)](#javascript---jsonpathselectorjson-stringobject)
- [javascript - alloc_json, dealloc_json](#javascript---alloc_json-dealloc_json)
- [javascript - examples](#javascript---examples)
[With Rust (as library)](#with-rust-as-library)
- [jsonpath_lib library](#jsonpath_lib-library)
- [rust - jsonpath::select(json: serde_json::value::Value, jsonpath: &str)](#rust---jsonpathselectjson-serde_jsonvaluevalue-jsonpath-str)
- [rust - jsonpath::compile(jsonpath: &str)](#rust---jsonpathcompilejsonpath-str)
- [rust - jsonpath::selector(json: serde_json::value::Value)](#rust---jsonpathselectorjson-serde_jsonvaluevalue)
- [rust - examples](#rust---examples)
[With AWS API Gateway](#with-aws-api-gateway)
[Simple time check](#simple-time-check-with-dchesterjsonpath)
## With Javascript (WebAssembly)
### jsonpath-wasm library
*(not yet published `jsonpath-wasm`)*
```javascript
// browser
import * as jsonpath from "jsonpath-wasm";
// nodejs
let jsonpath = require('jsonpath-wasm');
```
### javascript - jsonpath.select(json: string|object, jsonpath: string)
```javascript
let jsonObj = {
"school": {
"friends": [{"id": 0}, {"id": 1}]
},
"friends": [{"id": 0}, {"id": 1}]
};
let ret = [{"id": 0}, {"id": 0}];
let a = jsonpath.select(JSON.stringify(jsonObj), "$..friends[0]");
let b = jsonpath.select(jsonObj, "$..friends[0]");
console.log(
JSON.stringify(ret) == JSON.stringify(a),
JSON.stringify(a) == JSON.stringify(b)
);
```
### javascript - jsonpath.compile(jsonpath: string)
```javascript
let template = jsonpath.compile("$..friends[0]");
let jsonObj = {
"school": {
"friends": [ {"id": 0}, {"id": 1} ]
},
"friends": [ {"id": 0}, {"id": 1} ]
};
let ret = JSON.stringify([ {"id": 0}, {"id": 0} ]);
// 1. read as json object
console.log(JSON.stringify(template(jsonObj)) == ret);
// 2. read as json string
console.log(JSON.stringify(template(JSON.stringify(jsonObj))) == ret);
let jsonObj2 = {
"school": {
"friends": [
{"name": "Millicent Norman"},
{"name": "Vincent Cannon"}
]
},
"friends": [ {"id": 0}, {"id": 1} ]
};
let ret2 = JSON.stringify([ {"id": 0}, {"name": "Millicent Norman"} ]);
// 1. read as json object
console.log(JSON.stringify(template(jsonObj2)) == ret2);
// 2. read as json string
console.log(JSON.stringify(template(JSON.stringify(jsonObj2))) == ret2);
```
### javascript - jsonpath.selector(json: string|object)
```javascript
let jsonObj = {
"school": {
"friends": [{"id": 0}, {"id": 1}]
},
"friends": [{"id": 0},{"id": 1}]
};
let ret1 = JSON.stringify([ {"id": 0}, {"id": 0} ]);
let ret2 = JSON.stringify([ {"id": 1}, {"id": 1} ]);
// 1. read as json object
let selector = jsonpath.selector(jsonObj);
console.log(JSON.stringify(selector("$..friends[0]")) == ret1);
console.log(JSON.stringify(selector("$..friends[1]")) == ret2);
// 2. read as json string
let selector = jsonpath.selector(JSON.stringify(jsonObj));
console.log(JSON.stringify(selector("$..friends[0]")) == ret1);
console.log(JSON.stringify(selector("$..friends[1]")) == ret2);
```
### javascript - alloc_json, dealloc_json
wasm-bindgen은 Javascript와 Webassembly 간 값을 주고받을 때 JSON 객체는 String으로 변환되기 때문에, 반복해서 사용되는 JSON 객체를 Webassembly 영역에 생성해 두면 성능에 도움이 된다.
Since wasm-bindgen converts JSON objects to String when exchanging values between Javascript and Webassembly, it is helpful to create repeated Json objects in Webassembly area.
```javascript
let jsonObj = {
"school": {
"friends": [{"id": 0}, {"id": 1}]
},
"friends": [{"id": 0},{"id": 1}]
};
let path = '$..friends[0]';
let template = jsonpath.compile(path);
let selector = jsonpath.selector(jsonObj);
let ptr = jsonpath.alloc_json(jsonObj);
if(ptr == 0) console.error('invalid ptr'); // `0` is invalid pointer
let selector2 = jsonpath.selector(ptr);
let ret1 = selector(path)
let ret2 = selector2(path)
let ret3 = template(jsonObj);
let ret4 = template(ptr);
let ret5 = jsonpath.select(jsonObj, path);
let ret6 = jsonpath.select(ptr, path);
console.log(
JSON.stringify(ret1) == JSON.stringify(ret2),// true
JSON.stringify(ret1) == JSON.stringify(ret3),// true
JSON.stringify(ret1) == JSON.stringify(ret4),// true
JSON.stringify(ret1) == JSON.stringify(ret5),// true
JSON.stringify(ret1) == JSON.stringify(ret6));// true
jsonpath.dealloc_json(ptr);
```
### javascript - examples
**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
}
```
| <a href="https://freestrings.github.io/jsonpath/?path=$.store.book[*].author" target="_blank">$.store.book[*].author</a>| The authors of all books |
| <a href="https://freestrings.github.io/jsonpath/?path=$..author" target="_blank">$..author</a> | All authors |
| <a href="https://freestrings.github.io/jsonpath/?path=$.store.*" target="_blank">$.store.*</a> | All things, both books and bicycles |
| <a href="https://freestrings.github.io/jsonpath/?path=$.store..price" target="_blank">$.store..price</a> | The price of everything |
| <a href="https://freestrings.github.io/jsonpath/?path=$..book[2]" target="_blank">$..book[2]</a> | The third book |
| <a href="https://freestrings.github.io/jsonpath/?path=$..book[2]" target="_blank">$..book[-2]</a> | The second to last book |
| <a href="https://freestrings.github.io/jsonpath/?path=$..book[0,1]" target="_blank">$..book[0,1]</a> | The first two books |
| <a href="https://freestrings.github.io/jsonpath/?path=$..book[:2]" target="_blank">$..book[:2]</a> | All books from index 0 (inclusive) until index 2 (exclusive) |
| <a href="https://freestrings.github.io/jsonpath/?path=$..book[1:2]" target="_blank">$..book[1:2]</a> | All books from index 1 (inclusive) until index 2 (exclusive) |
| <a href="https://freestrings.github.io/jsonpath/?path=$..book[-2:]" target="_blank">$..book[-2:]</a> | Last two books |
| <a href="https://freestrings.github.io/jsonpath/?path=$..book[2:]" target="_blank">$..book[2:]</a> | Book number two from tail |
| <a href="https://freestrings.github.io/jsonpath/?path=$..book[?(@.isbn)]" target="_blank">$..book[?(@.isbn)]</a> | All books with an ISBN number |
| <a href="https://freestrings.github.io/jsonpath/?path=$.store.book[?(@.price < 10)]" target="_blank">$.store.book[?(@.price < 10)]</a> | All books in store cheaper than 10 |
| <a href="https://freestrings.github.io/jsonpath/?path=$..*" target="_blank">$..*</a> | Give me every thing
| <a href="https://freestrings.github.io/jsonpath/?path=%24..book%5B%3F((%40.price%20%3D%3D%2012.99%20%7C%7C%20%24.store.bicycle.price%20%3C%20%40.price)%20%7C%7C%20%40.category%20%3D%3D%20%22reference%22)%5D" target="_blank">$..book[ ?(<br>(@.price == 12.99 | | $.store.bicycle.price < @.price)<br> || @.category == "reference"<br>)]</a> | Complex filter
## With Rust (as library)
### jsonpath_lib library
```rust
extern crate jsonpath_lib as jsonpath;
#[macro_use]
extern crate serde_json;
```
### rust - jsonpath::select(json: serde_json::value::Value, jsonpath: &str)
```rust
let json_obj = json!({
"school": {
"friends": [{"id": 0}, {"id": 1}]
},
"friends": [{"id": 0}, {"id": 1}]
});
let json = jsonpath::select(json_obj, "$..friends[0]").unwrap();
let ret = json!([ {"id": 0}, {"id": 0} ]);
assert_eq!(json, ret)
```
### rust - jsonpath::compile(jsonpath: &str)
```rust
let mut template = jsonpath::compile("$..friends[0]");
let json_obj = json!({
"school": {
"friends": [ {"id": 0}, {"id": 1} ]
},
"friends": [ {"id": 0}, {"id": 1} ]
});
let json = template(json_obj).unwrap();
let ret = json!([ {"id": 0}, {"id": 0} ]);
assert_eq!(json, ret);
let json_obj = json!({
"school": {
"friends": [ {"name": "Millicent Norman"}, {"name": "Vincent Cannon"} ]
},
"friends": [ {"id": 0}, {"id": 1} ]
});
let json = template(json_obj).unwrap();
let ret = json!([ {"id": 0}, {"name": "Millicent Norman"} ]);
assert_eq!(json, ret);
```
### rust - jsonpath::selector(json: serde_json::value::Value)
```rust
let json_obj = json!({
"school": {
"friends": [{"id": 0}, {"id": 1}]
},
"friends": [{"id": 0},{"id": 1}]
});
let mut selector = jsonpath::selector(json_obj);
let json = selector("$..friends[0]").unwrap();
let ret = json!([ {"id": 0}, {"id": 0} ]);
assert_eq!(json, ret);
let json = selector("$..friends[1]").unwrap();
let ret = json!([ {"id": 1}, {"id": 1} ]);
assert_eq!(json, ret);
```
### rust - examples
```rust
let json_obj = json!({
"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
});
let mut selector = jsonpath::selector(json_obj);
```
#### $.store.book[*].author
```rust
let json = selector("$.store.book[*].author").unwrap();
let ret = json!([
"Nigel Rees",
"Evelyn Waugh",
"Herman Melville",
"J. R. R. Tolkien"
]);
assert_eq!(json, ret);
```
#### $..author
```rust
let json = selector("$..author").unwrap();
let ret = json!([
"Nigel Rees",
"Evelyn Waugh",
"Herman Melville",
"J. R. R. Tolkien"
]);
assert_eq!(json, ret);
```
#### $.store.*
```rust
let json = selector("$.store.*").unwrap();
let ret = json!([
[
{
"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
}
],
{
"color": "red",
"price": 19.95
}
]);
assert_eq!(ret, json);
```
#### $.store..price
```rust
let json = selector("$.store..price").unwrap();
let ret = json!([8.95, 12.99, 8.99, 22.99, 19.95]);
assert_eq!(ret, json);
```
#### $..book[2]
```rust
let json = selector("$..book[2]").unwrap();
let ret = json!([{
"category" : "fiction",
"author" : "Herman Melville",
"title" : "Moby Dick",
"isbn" : "0-553-21311-3",
"price" : 8.99
}]);
assert_eq!(ret, json);
```
#### $..book[-2]
```rust
let json = selector("$..book[-2]").unwrap();
let ret = json!([{
"category" : "fiction",
"author" : "Herman Melville",
"title" : "Moby Dick",
"isbn" : "0-553-21311-3",
"price" : 8.99
}]);
assert_eq!(ret, json);
```
#### $..book[0,1]
```rust
let json = selector("$..book[0,1]").unwrap();
let ret = json!([
{
"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
}
]);
assert_eq!(ret, json);
```
#### $..book[:2]
```rust
let json = selector("$..book[:2]").unwrap();
let ret = json!([
{
"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
}
]);
assert_eq!(ret, json);
```
#### $..book[2:]
```rust
let json = selector("$..book[2:]").unwrap();
let ret = json!([
{
"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
}
]);
assert_eq!(ret, json);
```
#### $..book[?(@.isbn)]
```rust
let json = selector("$..book[?(@.isbn)]").unwrap();
let ret = json!([
{
"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
}
]);
assert_eq!(ret, json);
```
#### $.store.book[?(@.price < 10)]
```rust
let json = selector("$.store.book[?(@.price < 10)]").unwrap();
let ret = json!([
{
"category": "reference",
"author": "Nigel Rees",
"title": "Sayings of the Century",
"price": 8.95
},
{
"category": "fiction",
"author": "Herman Melville",
"title": "Moby Dick",
"isbn": "0-553-21311-3",
"price": 8.99
}
]);
assert_eq!(ret, json);
```
#### $..book[?((@.price == 12.99 || $.store.bicycle.price < @.price) || @.category == "reference")]
```rust
let json = selector(r#"$..book[
?(
(@.price == 12.99 || $.store.bicycle.price < @.price)
|| @.category == "reference"
)]"#).unwrap();
let ret = json!([
{
"category": "fiction",
"author": "Evelyn Waugh",
"title": "Sword of Honour",
"price": 12.99
},
{
"category": "fiction",
"author": "J. R. R. Tolkien",
"title": "The Lord of the Rings",
"isbn": "0-395-19395-8",
"price": 22.99
},
{
"category": "reference",
"author": "Nigel Rees",
"title": "Sayings of the Century",
"price": 8.95
}
]);
assert_eq!(ret, json);
```
## With AWS API Gateway
-
## Simple time check with [dchester/jsonpath](https://github.com/dchester/jsonpath)
`jsonpath` is dchester/jsonpath `jsonpath-wasm` is freestrings/jsonpath's compiled to webassembly
`jsonpath-wasm` is slow performance on Chrome browser and in NodeJS. not yet usable. :)
### Browser [Bench Demo](https://freestrings.github.io/jsonpath/bench)
```
'$..book[?(@.price<30 && @.category=="fiction")]' (loop 2,000)
```
#### Chrome: 72.0
> Something to wrong in chrome
```
jsonpath, 166
jsonpath-wasm- selector, 256
jsonpath-wasm- compile, 1168
jsonpath-wasm- compile-alloc, 645
jsonpath-wasm- select, 3224
jsonpath-wasm- select-alloc, 1427
```
#### Firefox: 65.0
> jsonpath-wasm is faster than jsonpath
```
jsonpath, 125
jsonpath-wasm- selector, 101
jsonpath-wasm- compile, 169
jsonpath-wasm- compile-alloc, 78
jsonpath-wasm- select, 186
jsonpath-wasm- select-alloc, 93
```
### NodeJs
* NodeJS: 11.0
> Rust > jsonpath > jsonpath-wasm
```bash
cd benches && ./bench_node_vs_rust.sh
$..book[?(@.price<30 && @.category==fiction)] (loop 100,000)
Rust:
real 0m0.862s
user 0m0.862s
sys 0m0.000s
NodeJs - jsonpath module:
real 0m3.667s
user 0m4.139s
sys 0m0.045s
NodeJs - jsonpath-wasm module - selector:
real 0m5.331s
user 0m5.494s
sys 0m0.093s
NodeJs - jsonpath-wasm module - compile:
real 0m8.665s
user 0m8.809s
sys 0m0.197s
NodeJs - jsonpath-wasm module - compile-alloc:
real 0m4.014s
user 0m4.173s
sys 0m0.088s
NodeJs - jsonpath-wasm module - select:
real 0m9.843s
user 0m9.897s
sys 0m0.244s
NodeJs - jsonpath-wasm module - select-alloc:
Invalid function name
real 0m5.212s
user 0m5.339s
sys 0m0.096s
```