b663783717
For 3rd parties building binary packages, and for build consistency in general, it is very helpful to have the same set of dependencies at any time the product is built. See [tools/godep](https://github.com/tools/godep) for further details.
134 lines
2.6 KiB
Markdown
134 lines
2.6 KiB
Markdown
# YAML support for the Go language
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Introduction
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------------
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The yaml package enables Go programs to comfortably encode and decode YAML
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values. It was developed within [Canonical](https://www.canonical.com) as
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part of the [juju](https://juju.ubuntu.com) project, and is based on a
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pure Go port of the well-known [libyaml](http://pyyaml.org/wiki/LibYAML)
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C library to parse and generate YAML data quickly and reliably.
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Compatibility
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-------------
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The yaml package supports most of YAML 1.1 and 1.2, including support for
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anchors, tags, map merging, etc. Multi-document unmarshalling is not yet
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implemented, and base-60 floats from YAML 1.1 are purposefully not
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supported since they're a poor design and are gone in YAML 1.2.
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Installation and usage
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----------------------
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The import path for the package is *gopkg.in/yaml.v2*.
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To install it, run:
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go get gopkg.in/yaml.v2
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API documentation
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-----------------
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If opened in a browser, the import path itself leads to the API documentation:
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* [https://gopkg.in/yaml.v2](https://gopkg.in/yaml.v2)
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API stability
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-------------
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The package API for yaml v2 will remain stable as described in [gopkg.in](https://gopkg.in).
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License
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-------
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The yaml package is licensed under the Apache License 2.0. Please see the LICENSE file for details.
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Example
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-------
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Some more examples can be found in the "examples" folder.
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```Go
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package main
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import (
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"fmt"
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"log"
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"gopkg.in/yaml.v2"
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)
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var data = `
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a: Easy!
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b:
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c: 2
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d: [3, 4]
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`
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type T struct {
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A string
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B struct {
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RenamedC int `yaml:"c"`
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D []int `yaml:",flow"`
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}
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}
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func main() {
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t := T{}
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err := yaml.Unmarshal([]byte(data), &t)
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if err != nil {
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log.Fatalf("error: %v", err)
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}
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fmt.Printf("--- t:\n%v\n\n", t)
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d, err := yaml.Marshal(&t)
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if err != nil {
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log.Fatalf("error: %v", err)
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}
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fmt.Printf("--- t dump:\n%s\n\n", string(d))
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m := make(map[interface{}]interface{})
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err = yaml.Unmarshal([]byte(data), &m)
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if err != nil {
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log.Fatalf("error: %v", err)
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}
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fmt.Printf("--- m:\n%v\n\n", m)
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d, err = yaml.Marshal(&m)
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if err != nil {
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log.Fatalf("error: %v", err)
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}
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fmt.Printf("--- m dump:\n%s\n\n", string(d))
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}
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```
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This example will generate the following output:
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```
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--- t:
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{Easy! {2 [3 4]}}
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--- t dump:
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a: Easy!
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b:
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c: 2
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d: [3, 4]
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--- m:
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map[a:Easy! b:map[c:2 d:[3 4]]]
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--- m dump:
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a: Easy!
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b:
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c: 2
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d:
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- 3
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- 4
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```
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