mirror of
https://github.com/fluencelabs/jsonpath
synced 2025-04-25 09:22:19 +00:00
488 lines
12 KiB
Markdown
488 lines
12 KiB
Markdown
# jsonpath_lib
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[](https://travis-ci.org/freestrings/jsonpath)
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`Rust` 버전 [JsonPath](https://goessner.net/articles/JsonPath/) 구현이다. `Webassembly`와 `Javascript`에서도 유사한 API 인터페이스를 제공 한다.
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It is an implementation for [JsonPath](https://goessner.net/articles/JsonPath/) written in `Rust`. it provide a similar API interface in `Webassembly` and` Javascript` also.
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- [Webassembly Demo](https://freestrings.github.io/jsonpath/)
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- [Rust documentation](https://docs.rs/jsonpath_lib)
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## Why?
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To enjoy Rust!
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## API
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[With Javascript](#with-javascript)
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- [jsonpath-wasm library](#jsonpath-wasm-library)
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- [jsonpath-rs library](#jsonpath-rs-library-only-nodejs)
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- [Javascript - jsonpath.select(json: string|object, jsonpath: string)](#javascript---jsonpathselectjson-stringobject-jsonpath-string)
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- [Javascript - jsonpath.compile(jsonpath: string)](#javascript---jsonpathcompilejsonpath-string)
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- [Javascript - jsonpath.selector(json: string|object)](#javascript---jsonpathselectorjson-stringobject)
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- [Javascript - alloc_json, dealloc_json](#javascript---alloc_json-dealloc_json)
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- [Javascript-wasm - examples](https://github.com/freestrings/jsonpath/wiki/Javascript-examples)
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[With Rust](#with-rust)
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- [jsonpath_lib library](#jsonpath_lib-library)
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- [Rust - jsonpath::Selector struct](#rust---jsonpathselector-struct)
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- [Rust - jsonpath::select(json: &serde_json::value::Value, jsonpath: &str)](#rust---jsonpathselectjson-serde_jsonvaluevalue-jsonpath-str)
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- [Rust - jsonpath::select_as_str(json_str: &str, jsonpath: &str)](#rust---jsonpathselect_as_strjson-str-jsonpath-str)
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- [Rust - jsonpath::select_as\<T: `serde::de::DeserializeOwned`\>(json_str: &str, jsonpath: &str)](#rust---jsonpathselect_ast-serdededeserializeownedjson-str-jsonpath-str)
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- [Rust - jsonpath::compile(jsonpath: &str)](#rust---jsonpathcompilejsonpath-str)
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- [Rust - jsonpath::selector(json: &serde_json::value::Value)](#rust---jsonpathselectorjson-serde_jsonvaluevalue)
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- [Rust - jsonpath::selector_as\<T: `serde::de::DeserializeOwned`\>(json: &serde_json::value::Value)](#rust---jsonpathselector_ast-serdededeserializeownedjson-serde_jsonvaluevalue)
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- [Rust - examples](https://github.com/freestrings/jsonpath/wiki/rust-examples)
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[Simple time check - webassembly](https://github.com/freestrings/jsonpath/wiki/Simple-timecheck---jsonpath-wasm)
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[Simple time check - native addon for NodeJs](https://github.com/freestrings/jsonpath/wiki/Simple-timecheck-jsonpath-native)
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## With Javascript
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### jsonpath-wasm library
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*(not yet published `jsonpath-wasm`)*
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```javascript
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// browser
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import * as jsonpath from "jsonpath-wasm";
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// NodeJs
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const jsonpath = require('jsonpath-wasm');
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```
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### jsonpath-rs library (Only NodeJS)
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`jsonpath-rs` is native addon for NodeJs
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```javascript
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const jsonpath = require('jsonpath-rs');
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```
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### Javascript - jsonpath.select(json: string|object, jsonpath: string)
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```javascript
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let jsonObj = {
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"school": {
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"friends": [
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{"name": "친구1", "age": 20},
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{"name": "친구2", "age": 20}
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]
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},
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"friends": [
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{"name": "친구3", "age": 30},
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{"name": "친구4"}
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]
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};
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let ret = [
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{"name": "친구3", "age": 30},
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{"name": "친구1", "age": 20}
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];
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let selectAsString = jsonpath.select(JSON.stringify(jsonObj), '$..friends[0]');
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let selectAsObj = jsonpath.select(jsonObj, '$..friends[0]');
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console.log(
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JSON.stringify(ret) == JSON.stringify(selectAsString),
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JSON.stringify(ret) == JSON.stringify(selectAsObj)
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);
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// => true, true
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```
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### Javascript - jsonpath.compile(jsonpath: string)
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```javascript
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let template = jsonpath.compile('$..friends[0]');
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let jsonObj = {
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"school": {
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"friends": [
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{"name": "친구1", "age": 20},
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{"name": "친구2", "age": 20}
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]
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},
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"friends": [
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{"name": "친구3", "age": 30},
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{"name": "친구4"}
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]
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};
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let ret = [
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{"name": "친구3", "age": 30},
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{"name": "친구1", "age": 20}
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];
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let selectAsString = template(JSON.stringify(jsonObj));
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let selectAsObj = template(jsonObj);
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console.log(
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JSON.stringify(ret) == JSON.stringify(selectAsString),
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JSON.stringify(ret) == JSON.stringify(selectAsObj)
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);
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// => true, true
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let jsonObj2 = {
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"school": {
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"friends": [
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{"name": "Millicent Norman"},
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{"name": "Vincent Cannon"}
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]
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},
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"friends": [ {"age": 30}, {"age": 40} ]
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};
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let ret2 = [
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{"age": 30},
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{"name": "Millicent Norman"}
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];
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let selectAsString2 = template(JSON.stringify(jsonObj2));
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let selectAsObj2 = template(jsonObj2);
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console.log(
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JSON.stringify(ret2) == JSON.stringify(selectAsString2),
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JSON.stringify(ret2) == JSON.stringify(selectAsObj2)
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);
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// => true, true
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```
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### Javascript - jsonpath.selector(json: string|object)
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```javascript
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let jsonObj = {
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"school": {
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"friends": [
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{"name": "친구1", "age": 20},
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{"name": "친구2", "age": 20}
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]
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},
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"friends": [
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{"name": "친구3", "age": 30},
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{"name": "친구4"}
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]
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};
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let ret1 = [
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{"name": "친구3", "age": 30},
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{"name": "친구1", "age": 20}
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];
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let ret2 = [
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{"name": "친구4"},
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{"name": "친구2", "age": 20}
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];
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let selector = jsonpath.selector(jsonObj);
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// or as json string
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// let selector = jsonpath.selector(JSON.stringify(jsonObj));
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let select1 = selector('$..friends[0]');
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let select2 = selector('$..friends[1]');
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console.log(
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JSON.stringify(ret1) == JSON.stringify(select1),
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JSON.stringify(ret2) == JSON.stringify(select2)
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);
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// => true, true
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```
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### Javascript - alloc_json, dealloc_json
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*(not supported in `jsonpath-rs`)*
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wasm-bindgen은 Javascript와 Webassembly 간 값을 주고받을 때 JSON 객체는 String으로 변환되기 때문에, 반복해서 사용되는 JSON 객체를 Webassembly 영역에 생성해 두면 성능에 도움이 된다.
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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.
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```javascript
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const jsonpath = require('@nodejs/jsonpath-wasm');
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let jsonObj = {
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"school": {
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"friends": [
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{"name": "친구1", "age": 20},
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{"name": "친구2", "age": 20}
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]
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},
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"friends": [
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{"name": "친구3", "age": 30},
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{"name": "친구4"}
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]
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};
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// allocate jsonObj in webassembly
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let ptr = jsonpath.alloc_json(jsonObj);
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// `0` is invalid pointer
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if(ptr == 0) {
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console.error('invalid ptr');
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}
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let path = '$..friends[0]';
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let template = jsonpath.compile(path);
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let selector = jsonpath.selector(jsonObj);
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// create selector as pointer
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let ptrSelector = jsonpath.selector(ptr);
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let ret1 = selector(path)
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let ret2 = ptrSelector(path)
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let ret3 = template(jsonObj);
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// select as pointer
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let ret4 = template(ptr);
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let ret5 = jsonpath.select(jsonObj, path);
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// select as pointer
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let ret6 = jsonpath.select(ptr, path);
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console.log(
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JSON.stringify(ret1) == JSON.stringify(ret2),
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JSON.stringify(ret1) == JSON.stringify(ret3),
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JSON.stringify(ret1) == JSON.stringify(ret4),
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JSON.stringify(ret1) == JSON.stringify(ret5),
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JSON.stringify(ret1) == JSON.stringify(ret6));
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// => true true true true true
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jsonpath.dealloc_json(ptr);
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```
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## With Rust
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### jsonpath_lib library
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```rust
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extern crate jsonpath_lib as jsonpath;
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#[macro_use]
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extern crate serde_json;
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```
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### Rust - jsonpath::Selector struct
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```rust
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#[derive(Serialize, Deserialize, PartialEq, Debug)]
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struct Friend {
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name: String,
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age: Option<u8>,
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}
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let json_obj = json!({
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"school": {
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"friends": [
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{"name": "친구1", "age": 20},
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{"name": "친구2", "age": 20}
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]
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},
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"friends": [
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{"name": "친구3", "age": 30},
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{"name": "친구4"}
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]});
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let mut selector = Selector::new();
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let result = selector
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.path("$..[?(@.age >= 30)]").unwrap()
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// .value_from_str(&serde_json::to_string(&json_obj).unwrap() /*&str*/).unwrap()
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// .value_from(&json_obj /*&impl serde::ser::Serialize*/).unwrap()
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.value((&json_obj /*serde_json::value::Value*/ ).into()).unwrap()
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.select_to_value().unwrap();
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assert_eq!(json!([{"name": "친구3", "age": 30}]), result);
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let result = selector.select_to_str().unwrap();
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assert_eq!(r#"[{"name":"친구3","age":30}]"#, result);
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let result = selector.select_to::<Vec<Friend>>().unwrap();
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assert_eq!(vec![Friend { name: "친구3".to_string(), age: Some(30) }], result);
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```
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### rust - jsonpath::select(json: &serde_json::value::Value, jsonpath: &str)
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```rust
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let json_obj = json!({
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"school": {
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"friends": [
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{"name": "친구1", "age": 20},
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{"name": "친구2", "age": 20}
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]
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},
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"friends": [
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{"name": "친구3", "age": 30},
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{"name": "친구4"}
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]});
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let json = jsonpath::select(&json_obj, "$..friends[0]").unwrap();
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let ret = json!([
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{"name": "친구3", "age": 30},
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{"name": "친구1", "age": 20}
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]);
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assert_eq!(json, ret);
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```
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### Rust - jsonpath::select_as_str(json: &str, jsonpath: &str)
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```rust
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let ret = jsonpath::select_as_str(r#"
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{
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"school": {
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"friends": [
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{"name": "친구1", "age": 20},
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{"name": "친구2", "age": 20}
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]
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},
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"friends": [
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{"name": "친구3", "age": 30},
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{"name": "친구4"}
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]
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}
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"#, "$..friends[0]").unwrap();
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assert_eq!(ret, r#"[{"name":"친구3","age":30},{"name":"친구1","age":20}]"#);
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```
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### Rust - jsonpath::select_as\<T: `serde::de::DeserializeOwned`\>(json: &str, jsonpath: &str)
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```rust
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#[derive(Deserialize, PartialEq, Debug)]
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struct Person {
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name: String,
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age: u8,
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phones: Vec<String>,
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}
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let ret: Person = jsonpath::select_as(r#"
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{
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"person":
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{
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"name": "Doe John",
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"age": 44,
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"phones": [
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"+44 1234567",
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"+44 2345678"
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]
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}
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}
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"#, "$.person").unwrap();
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let person = Person {
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name: "Doe John".to_string(),
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age: 44,
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phones: vec!["+44 1234567".to_string(), "+44 2345678".to_string()],
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};
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assert_eq!(person, ret);
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```
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### Rust - jsonpath::compile(jsonpath: &str)
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```rust
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let mut template = jsonpath::compile("$..friends[0]");
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let json_obj = json!({
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"school": {
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"friends": [
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{"name": "친구1", "age": 20},
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{"name": "친구2", "age": 20}
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]
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},
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"friends": [
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{"name": "친구3", "age": 30},
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{"name": "친구4"}
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]});
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let json = template(&json_obj).unwrap();
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let ret = json!([
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{"name": "친구3", "age": 30},
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{"name": "친구1", "age": 20}
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]);
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assert_eq!(json, ret);
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```
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### Rust - jsonpath::selector(json: &serde_json::value::Value)
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```rust
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let json_obj = json!({
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"school": {
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"friends": [
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{"name": "친구1", "age": 20},
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{"name": "친구2", "age": 20}
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]
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},
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"friends": [
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{"name": "친구3", "age": 30},
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{"name": "친구4"}
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]});
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let mut selector = jsonpath::selector(&json_obj);
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let json = selector("$..friends[0]").unwrap();
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let ret = json!([
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{"name": "친구3", "age": 30},
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{"name": "친구1", "age": 20}
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]);
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assert_eq!(json, ret);
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let json = selector("$..friends[1]").unwrap();
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let ret = json!([
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{"name": "친구4"},
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{"name": "친구2", "age": 20}
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]);
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assert_eq!(json, ret);
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```
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### Rust - jsonpath::selector_as\<T: `serde::de::DeserializeOwned`\>(json: &serde_json::value::Value)
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```rust
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let json_obj = json!({
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"school": {
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"friends": [
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{"name": "친구1", "age": 20},
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{"name": "친구2", "age": 20}
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]
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},
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"friends": [
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{"name": "친구3", "age": 30},
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{"name": "친구4"}
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]});
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#[derive(Serialize, Deserialize, PartialEq, Debug)]
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struct Friend {
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name: String,
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age: Option<u8>,
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}
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let mut selector = jsonpath::selector_as::<Vec<Friend>>(&json_obj);
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let json = selector("$..friends[0]").unwrap();
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let ret = vec!(
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Friend { name: "친구3".to_string(), age: Some(30) },
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Friend { name: "친구1".to_string(), age: Some(20) }
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);
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assert_eq!(json, ret);
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let json = selector("$..friends[1]").unwrap();
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let ret = vec!(
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Friend { name: "친구4".to_string(), age: None },
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Friend { name: "친구2".to_string(), age: Some(20) }
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);
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assert_eq!(json, ret);
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``` |