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reference: move exported regexes to separate block

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This makes them easier to find between the non-exported ones, and puts
them as separate sections in the generated docs. While updating, also
extended documentation for some to be more descriptive.

Signed-off-by: Sebastiaan van Stijn <github@gone.nl>
This commit is contained in:
Sebastiaan van Stijn 2022-11-09 18:27:05 +01:00
parent a4cec8ca82
commit 02e88c0f15
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GPG key ID: 76698F39D527CE8C
1 changed files with 33 additions and 31 deletions
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64
reference/regexp.go
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@ -5,6 +5,39 @@ import (
"strings"
)
// DigestRegexp matches well-formed digests, including algorithm (e.g. "sha256:<encoded>").
var DigestRegexp = regexp.MustCompile(digestPat)
// DomainRegexp matches hostname or IP-addresses, optionally including a port
// number. It defines the structure of potential domain components that may be
// part of image names. This is purposely a subset of what is allowed by DNS to
// ensure backwards compatibility with Docker image names. It may be a subset of
// DNS domain name, an IPv4 address in decimal format, or an IPv6 address between
// square brackets (excluding zone identifiers as defined by [RFC 6874] or special
// addresses such as IPv4-Mapped).
//
// [RFC 6874]: https://www.rfc-editor.org/rfc/rfc6874.
var DomainRegexp = regexp.MustCompile(domainAndPort)
// IdentifierRegexp is the format for string identifier used as a
// content addressable identifier using sha256. These identifiers
// are like digests without the algorithm, since sha256 is used.
var IdentifierRegexp = regexp.MustCompile(identifier)
// NameRegexp is the format for the name component of references, including
// an optional domain and port, but without tag or digest suffix.
var NameRegexp = regexp.MustCompile(namePat)
// ReferenceRegexp is the full supported format of a reference. The regexp
// is anchored and has capturing groups for name, tag, and digest
// components.
var ReferenceRegexp = regexp.MustCompile(referencePat)
// TagRegexp matches valid tag names. From [docker/docker:graph/tags.go].
//
// [docker/docker:graph/tags.go]: https://github.com/moby/moby/blob/v1.6.0/graph/tags.go#L26-L28
var TagRegexp = regexp.MustCompile(tag)
const (
// alphanumeric defines the alphanumeric atom, typically a
// component of names. This only allows lower case characters and digits.
@ -76,27 +109,10 @@ var (
// compatibility with Docker image names.
domainAndPort = host + optionalPort
// DomainRegexp matches hostname or IP-addresses, optionally including a port
// number. It defines the structure of potential domain components that may be
// part of image names. This is purposely a subset of what is allowed by DNS to
// ensure backwards compatibility with Docker image names. It may be a subset of
// DNS domain name, an IPv4 address in decimal format, or an IPv6 address between
// square brackets (excluding zone identifiers as defined by [rfc6874] or special
// addresses such as IPv4-Mapped).
//
// [rfc6874]: https://www.rfc-editor.org/rfc/rfc6874.
DomainRegexp = regexp.MustCompile(domainAndPort)
// TagRegexp matches valid tag names. From docker/docker:graph/tags.go.
TagRegexp = regexp.MustCompile(tag)
// anchoredTagRegexp matches valid tag names, anchored at the start and
// end of the matched string.
anchoredTagRegexp = regexp.MustCompile(anchored(tag))
// DigestRegexp matches well-formed digests, including algorithm (e.g. "sha256:<encoded>").
DigestRegexp = regexp.MustCompile(digestPat)
// anchoredDigestRegexp matches valid digests, anchored at the start and
// end of the matched string.
anchoredDigestRegexp = regexp.MustCompile(anchored(digestPat))
@ -113,26 +129,12 @@ var (
remoteName = pathComponent + anyTimes(`/`+pathComponent)
namePat = optional(domainAndPort+`/`) + remoteName
// NameRegexp is the format for the name component of references, including
// an optional domain and port, but without tag or digest suffix.
NameRegexp = regexp.MustCompile(namePat)
// anchoredNameRegexp is used to parse a name value, capturing the
// domain and trailing components.
anchoredNameRegexp = regexp.MustCompile(anchored(optional(capture(domainAndPort), `/`), capture(remoteName)))
referencePat = anchored(capture(namePat), optional(`:`, capture(tag)), optional(`@`, capture(digestPat)))
// ReferenceRegexp is the full supported format of a reference. The regexp
// is anchored and has capturing groups for name, tag, and digest
// components.
ReferenceRegexp = regexp.MustCompile(referencePat)
// IdentifierRegexp is the format for string identifier used as a
// content addressable identifier using sha256. These identifiers
// are like digests without the algorithm, since sha256 is used.
IdentifierRegexp = regexp.MustCompile(identifier)
// anchoredIdentifierRegexp is used to check or match an
// identifier value, anchored at start and end of string.
anchoredIdentifierRegexp = regexp.MustCompile(anchored(identifier))