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moby--moby/pkg/discovery/generator.go
Daniel Nephin 4f0d95fa6e Add canonical import comment
Signed-off-by: Daniel Nephin <dnephin@docker.com>
2018-02-05 16:51:57 -05:00

35 lines
702 B
Go

package discovery // import "github.com/docker/docker/pkg/discovery"
import (
"fmt"
"regexp"
"strconv"
)
// Generate takes care of IP generation
func Generate(pattern string) []string {
re, _ := regexp.Compile(`\[(.+):(.+)\]`)
submatch := re.FindStringSubmatch(pattern)
if submatch == nil {
return []string{pattern}
}
from, err := strconv.Atoi(submatch[1])
if err != nil {
return []string{pattern}
}
to, err := strconv.Atoi(submatch[2])
if err != nil {
return []string{pattern}
}
template := re.ReplaceAllString(pattern, "%d")
var result []string
for val := from; val <= to; val++ {
entry := fmt.Sprintf(template, val)
result = append(result, entry)
}
return result
}