mirror of https://github.com/kubernetes/kops.git
114 lines
3.5 KiB
Markdown
114 lines
3.5 KiB
Markdown
JsonPath
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----------------
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A golang implementation of JsonPath syntax.
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follow the majority rules in http://goessner.net/articles/JsonPath/
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but also with some minor differences.
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this library is till bleeding edge, so use it at your own risk. :D
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**Golang Version Required**: 1.5+
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Get Started
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------------
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```bash
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go get github.com/oliveagle/jsonpath
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```
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example code:
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```go
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import (
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"github.com/oliveagle/jsonpath"
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"encoding/json"
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)
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var json_data interface{}
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json.Unmarshal([]byte(data), &json_data)
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res, err := jsonpath.JsonPathLookup(json_data, "$.expensive")
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//or reuse lookup pattern
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pat, _ := jsonpath.Compile(`$.store.book[?(@.price < $.expensive)].price`)
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res, err := pat.Lookup(json_data)
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```
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Operators
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--------
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referenced from github.com/jayway/JsonPath
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| Operator | Supported | Description |
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| ---- | :---: | ---------- |
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| $ | Y | The root element to query. This starts all path expressions. |
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| @ | Y | The current node being processed by a filter predicate. |
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| * | X | Wildcard. Available anywhere a name or numeric are required. |
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| .. | X | Deep scan. Available anywhere a name is required. |
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| .<name> | Y | Dot-notated child |
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| ['<name>' (, '<name>')] | X | Bracket-notated child or children |
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| [<number> (, <number>)] | Y | Array index or indexes |
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| [start:end] | Y | Array slice operator |
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| [?(<expression>)] | Y | Filter expression. Expression must evaluate to a boolean value. |
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Examples
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--------
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given these example data.
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```javascript
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{
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"store": {
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"book": [
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{
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"category": "reference",
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"author": "Nigel Rees",
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"title": "Sayings of the Century",
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"price": 8.95
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},
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{
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"category": "fiction",
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"author": "Evelyn Waugh",
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"title": "Sword of Honour",
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"price": 12.99
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},
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{
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"category": "fiction",
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"author": "Herman Melville",
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"title": "Moby Dick",
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"isbn": "0-553-21311-3",
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"price": 8.99
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},
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{
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"category": "fiction",
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"author": "J. R. R. Tolkien",
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"title": "The Lord of the Rings",
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"isbn": "0-395-19395-8",
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"price": 22.99
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}
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],
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"bicycle": {
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"color": "red",
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"price": 19.95
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}
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},
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"expensive": 10
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}
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```
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example json path syntax.
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----
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| jsonpath | result|
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| :--------- | :-------|
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| $.expensive | 10|
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| $.store.book[0].price | 8.95|
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| $.store.book[-1].isbn | "0-395-19395-8"|
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| $.store.book[0,1].price | [8.95, 12.99] |
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| $.store.book[0:2].price | [8.95, 12.99, 8.99]|
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| $.store.book[?(@.isbn)].price | [8.99, 22.99] |
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| $.store.book[?(@.price > 10)].title | ["Sword of Honour", "The Lord of the Rings"]|
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| $.store.book[?(@.price < $.expensive)].price | [8.95, 8.99] |
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| $.store.book[:].price | [8.9.5, 12.99, 8.9.9, 22.99] |
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| $.store.book[?(@.author =~ /(?i).*REES/)].author | "Nigel Rees" |
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> Note: golang support regular expression flags in form of `(?imsU)pattern` |