Convert site to Hugo (#8316)
This commit converts content and layout to use Hugo.
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---
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title: JSONPath 支持
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---
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JSONPath 模板由 {} 包起来的 JSONPath 表达式组成。
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除了原始的 JSONPath 语法之外,我们还添加了三个函数:
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1. `$` 运算符是可选的,因为表达式默认情况下始终从根对象开始。
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2. 我们可以使用 `""` 来引用 JSONPath 表达式中的文本。
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3. 我们可以使用 `range` 运算符来迭代列表。
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结果对象使用 String() 函数打印。
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给定输入:
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```json
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{
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"kind": "List",
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"items":[
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{
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"kind":"None",
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"metadata":{"name":"127.0.0.1"},
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"status":{
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"capacity":{"cpu":"4"},
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"addresses":[{"type": "LegacyHostIP", "address":"127.0.0.1"}]
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}
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},
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{
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"kind":"None",
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"metadata":{"name":"127.0.0.2"},
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"status":{
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"capacity":{"cpu":"8"},
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"addresses":[
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{"type": "LegacyHostIP", "address":"127.0.0.2"},
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{"type": "another", "address":"127.0.0.3"}
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]
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}
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}
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],
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"users":[
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{
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"name": "myself",
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"user": {}
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},
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{
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"name": "e2e",
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"user": {"username": "admin", "password": "secret"}
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}
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]
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}
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```
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| 函数 | 描述 | 示例 | 结果 |
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| ----------------- | ---------- | ---------------------------------------- | ---------------------------------------- |
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| text | 纯文本 | kind is {.kind} | kind is List |
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| @ | 当前对象 | {@} | 与输入相同 |
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| . or [] | 子运算符 | {.kind} 或者 {['kind']} | List |
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| .. | 递归下降 | {..name} | 127.0.0.1 127.0.0.2 myself e2e |
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| * | 通配符,获取所有对象 | {.items[*].metadata.name} | [127.0.0.1 127.0.0.2] |
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| [start:end :step] | 下标运算符 | {.users[0].name} | myself |
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| [,] | 并集运算符 | {.items[*]['metadata.name', 'status.capacity']} | 127.0.0.1 127.0.0.2 map[cpu:4] map[cpu:8] |
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| ?() | 过滤 | {.users[?(@.name=="e2e")].user.password} | secret |
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| range, end | 迭代列表 | {range .items[*]}[{.metadata.name}, {.status.capacity}] {end} | [127.0.0.1, map[cpu:4]] [127.0.0.2, map[cpu:8]] |
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| "" | 引用解释执行字符串 | {range .items[*]}{.metadata.name}{"\t"}{end} | 127.0.0.1 127.0.0.2 |
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