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// Copyright 2016 Canonical Ltd.
// Licensed under the LGPLv3, see LICENCE file for details.
package names
import (
"fmt"
"regexp"
)
const CloudTagKind = "cloud"
var (
cloudSnippet = "[a-zA-Z0-9][a-zA-Z0-9._-]*"
validCloud = regexp.MustCompile("^" + cloudSnippet + "$")
)
type CloudTag struct {
id string
}
func (t CloudTag) String() string { return t.Kind() + "-" + t.id }
func (t CloudTag) Kind() string { return CloudTagKind }
func (t CloudTag) Id() string { return t.id }
// NewCloudTag returns the tag for the cloud with the given ID.
// It will panic if the given cloud ID is not valid.
func NewCloudTag(id string) CloudTag {
if !IsValidCloud(id) {
panic(fmt.Sprintf("%q is not a valid cloud ID", id))
}
return CloudTag{id}
}
// ParseCloudTag parses a cloud tag string.
func ParseCloudTag(cloudTag string) (CloudTag, error) {
tag, err := ParseTag(cloudTag)
if err != nil {
return CloudTag{}, err
}
dt, ok := tag.(CloudTag)
if !ok {
return CloudTag{}, invalidTagError(cloudTag, CloudTagKind)
}
return dt, nil
}
// IsValidCloud returns whether id is a valid cloud ID.
func IsValidCloud(id string) bool {
return validCloud.MatchString(id)
}
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