distribution/reference/regexp.go
Aaron Lehmann b07d759241 Add WithTag and WithDigest combinator functions
These functions allow a Named type to be combined with a tag or a
digest. WithTag will replace the ImageReference function in
github.com/docker/docker/utils as the Docker Engine transitions to the
reference package.

Signed-off-by: Aaron Lehmann <aaron.lehmann@docker.com>
2015-10-12 16:00:33 -07:00

49 lines
2.5 KiB
Go

package reference
import "regexp"
var (
// nameSubComponentRegexp defines the part of the name which must be
// begin and end with an alphanumeric character. These characters can
// be separated by any number of dashes.
nameSubComponentRegexp = regexp.MustCompile(`[a-z0-9]+(?:[-]+[a-z0-9]+)*`)
// nameComponentRegexp restricts registry path component names to
// start with at least one letter or number, with following parts able to
// be separated by one period, underscore or double underscore.
nameComponentRegexp = regexp.MustCompile(nameSubComponentRegexp.String() + `(?:(?:[._]|__)` + nameSubComponentRegexp.String() + `)*`)
nameRegexp = regexp.MustCompile(`(?:` + nameComponentRegexp.String() + `/)*` + nameComponentRegexp.String())
hostnameComponentRegexp = regexp.MustCompile(`(?:[a-z0-9]|[a-z0-9][a-z0-9-]*[a-z0-9])`)
// hostnameComponentRegexp restricts the registry hostname component of a repository name to
// start with a component as defined by hostnameRegexp and followed by an optional port.
hostnameRegexp = regexp.MustCompile(`(?:` + hostnameComponentRegexp.String() + `\.)*` + hostnameComponentRegexp.String() + `(?::[0-9]+)?`)
// TagRegexp matches valid tag names. From docker/docker:graph/tags.go.
TagRegexp = regexp.MustCompile(`[\w][\w.-]{0,127}`)
// anchoredTagRegexp matches valid tag names, anchored at the start and
// end of the matched string.
anchoredTagRegexp = regexp.MustCompile(`^` + TagRegexp.String() + `$`)
// DigestRegexp matches valid digests.
DigestRegexp = regexp.MustCompile(`[A-Za-z][A-Za-z0-9]*(?:[-_+.][A-Za-z][A-Za-z0-9]*)*[:][[:xdigit:]]{32,}`)
// anchoredDigestRegexp matches valid digests, anchored at the start and
// end of the matched string.
anchoredDigestRegexp = regexp.MustCompile(`^` + DigestRegexp.String() + `$`)
// NameRegexp is the format for the name component of references. The
// regexp has capturing groups for the hostname and name part omitting
// the seperating forward slash from either.
NameRegexp = regexp.MustCompile(`(?:` + hostnameRegexp.String() + `/)?` + nameRegexp.String())
// ReferenceRegexp is the full supported format of a reference. The
// regexp has capturing groups for name, tag, and digest components.
ReferenceRegexp = regexp.MustCompile(`^((?:` + hostnameRegexp.String() + `/)?` + nameRegexp.String() + `)(?:[:](` + TagRegexp.String() + `))?(?:[@](` + DigestRegexp.String() + `))?$`)
// anchoredNameRegexp is used to parse a name value, capturing hostname
anchoredNameRegexp = regexp.MustCompile(`^(?:(` + hostnameRegexp.String() + `)/)?(` + nameRegexp.String() + `)$`)
)