mirror of https://github.com/status-im/consul.git
75 lines
1.5 KiB
Markdown
75 lines
1.5 KiB
Markdown
# pointerstructure [](https://godoc.org/github.com/mitchellh/pointerstructure)
|
|
|
|
pointerstructure is a Go library for identifying a specific value within
|
|
any Go structure using a string syntax.
|
|
|
|
pointerstructure is based on
|
|
[JSON Pointer (RFC 6901)](https://tools.ietf.org/html/rfc6901), but
|
|
reimplemented for Go.
|
|
|
|
The goal of pointerstructure is to provide a single, well-known format
|
|
for addressing a specific value. This can be useful for user provided
|
|
input on structures, diffs of structures, etc.
|
|
|
|
## Features
|
|
|
|
* Get the value for an address
|
|
|
|
* Set the value for an address within an existing structure
|
|
|
|
* Delete the value at an address
|
|
|
|
* Sorting a list of addresses
|
|
|
|
## Installation
|
|
|
|
Standard `go get`:
|
|
|
|
```
|
|
$ go get github.com/mitchellh/pointerstructure
|
|
```
|
|
|
|
## Usage & Example
|
|
|
|
For usage and examples see the [Godoc](http://godoc.org/github.com/mitchellh/pointerstructure).
|
|
|
|
A quick code example is shown below:
|
|
|
|
```go
|
|
complex := map[string]interface{}{
|
|
"alice": 42,
|
|
"bob": []interface{}{
|
|
map[string]interface{}{
|
|
"name": "Bob",
|
|
},
|
|
},
|
|
}
|
|
|
|
value, err := pointerstructure.Get(complex, "/bob/0/name")
|
|
if err != nil {
|
|
panic(err)
|
|
}
|
|
|
|
fmt.Printf("%s", value)
|
|
// Output:
|
|
// Bob
|
|
```
|
|
|
|
Continuing the example above, you can also set values:
|
|
|
|
```go
|
|
value, err = pointerstructure.Set(complex, "/bob/0/name", "Alice")
|
|
if err != nil {
|
|
panic(err)
|
|
}
|
|
|
|
value, err = pointerstructure.Get(complex, "/bob/0/name")
|
|
if err != nil {
|
|
panic(err)
|
|
}
|
|
|
|
fmt.Printf("%s", value)
|
|
// Output:
|
|
// Alice
|
|
```
|