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Diffstat (limited to 'vendor/golang.org/x/mod/module/pseudo.go')
| -rw-r--r-- | vendor/golang.org/x/mod/module/pseudo.go | 250 |
1 files changed, 0 insertions, 250 deletions
diff --git a/vendor/golang.org/x/mod/module/pseudo.go b/vendor/golang.org/x/mod/module/pseudo.go deleted file mode 100644 index 9cf19d325..000000000 --- a/vendor/golang.org/x/mod/module/pseudo.go +++ /dev/null @@ -1,250 +0,0 @@ -// Copyright 2018 The Go Authors. All rights reserved. -// Use of this source code is governed by a BSD-style -// license that can be found in the LICENSE file. - -// Pseudo-versions -// -// Code authors are expected to tag the revisions they want users to use, -// including prereleases. However, not all authors tag versions at all, -// and not all commits a user might want to try will have tags. -// A pseudo-version is a version with a special form that allows us to -// address an untagged commit and order that version with respect to -// other versions we might encounter. -// -// A pseudo-version takes one of the general forms: -// -// (1) vX.0.0-yyyymmddhhmmss-abcdef123456 -// (2) vX.Y.(Z+1)-0.yyyymmddhhmmss-abcdef123456 -// (3) vX.Y.(Z+1)-0.yyyymmddhhmmss-abcdef123456+incompatible -// (4) vX.Y.Z-pre.0.yyyymmddhhmmss-abcdef123456 -// (5) vX.Y.Z-pre.0.yyyymmddhhmmss-abcdef123456+incompatible -// -// If there is no recently tagged version with the right major version vX, -// then form (1) is used, creating a space of pseudo-versions at the bottom -// of the vX version range, less than any tagged version, including the unlikely v0.0.0. -// -// If the most recent tagged version before the target commit is vX.Y.Z or vX.Y.Z+incompatible, -// then the pseudo-version uses form (2) or (3), making it a prerelease for the next -// possible semantic version after vX.Y.Z. The leading 0 segment in the prerelease string -// ensures that the pseudo-version compares less than possible future explicit prereleases -// like vX.Y.(Z+1)-rc1 or vX.Y.(Z+1)-1. -// -// If the most recent tagged version before the target commit is vX.Y.Z-pre or vX.Y.Z-pre+incompatible, -// then the pseudo-version uses form (4) or (5), making it a slightly later prerelease. - -package module - -import ( - "errors" - "fmt" - "strings" - "time" - - "golang.org/x/mod/internal/lazyregexp" - "golang.org/x/mod/semver" -) - -var pseudoVersionRE = lazyregexp.New(`^v[0-9]+\.(0\.0-|\d+\.\d+-([^+]*\.)?0\.)\d{14}-[A-Za-z0-9]+(\+[0-9A-Za-z-]+(\.[0-9A-Za-z-]+)*)?$`) - -const PseudoVersionTimestampFormat = "20060102150405" - -// PseudoVersion returns a pseudo-version for the given major version ("v1") -// preexisting older tagged version ("" or "v1.2.3" or "v1.2.3-pre"), revision time, -// and revision identifier (usually a 12-byte commit hash prefix). -func PseudoVersion(major, older string, t time.Time, rev string) string { - if major == "" { - major = "v0" - } - segment := fmt.Sprintf("%s-%s", t.UTC().Format(PseudoVersionTimestampFormat), rev) - build := semver.Build(older) - older = semver.Canonical(older) - if older == "" { - return major + ".0.0-" + segment // form (1) - } - if semver.Prerelease(older) != "" { - return older + ".0." + segment + build // form (4), (5) - } - - // Form (2), (3). - // Extract patch from vMAJOR.MINOR.PATCH - i := strings.LastIndex(older, ".") + 1 - v, patch := older[:i], older[i:] - - // Reassemble. - return v + incDecimal(patch) + "-0." + segment + build -} - -// ZeroPseudoVersion returns a pseudo-version with a zero timestamp and -// revision, which may be used as a placeholder. -func ZeroPseudoVersion(major string) string { - return PseudoVersion(major, "", time.Time{}, "000000000000") -} - -// incDecimal returns the decimal string incremented by 1. -func incDecimal(decimal string) string { - // Scan right to left turning 9s to 0s until you find a digit to increment. - digits := []byte(decimal) - i := len(digits) - 1 - for ; i >= 0 && digits[i] == '9'; i-- { - digits[i] = '0' - } - if i >= 0 { - digits[i]++ - } else { - // digits is all zeros - digits[0] = '1' - digits = append(digits, '0') - } - return string(digits) -} - -// decDecimal returns the decimal string decremented by 1, or the empty string -// if the decimal is all zeroes. -func decDecimal(decimal string) string { - // Scan right to left turning 0s to 9s until you find a digit to decrement. - digits := []byte(decimal) - i := len(digits) - 1 - for ; i >= 0 && digits[i] == '0'; i-- { - digits[i] = '9' - } - if i < 0 { - // decimal is all zeros - return "" - } - if i == 0 && digits[i] == '1' && len(digits) > 1 { - digits = digits[1:] - } else { - digits[i]-- - } - return string(digits) -} - -// IsPseudoVersion reports whether v is a pseudo-version. -func IsPseudoVersion(v string) bool { - return strings.Count(v, "-") >= 2 && semver.IsValid(v) && pseudoVersionRE.MatchString(v) -} - -// IsZeroPseudoVersion returns whether v is a pseudo-version with a zero base, -// timestamp, and revision, as returned by [ZeroPseudoVersion]. -func IsZeroPseudoVersion(v string) bool { - return v == ZeroPseudoVersion(semver.Major(v)) -} - -// PseudoVersionTime returns the time stamp of the pseudo-version v. -// It returns an error if v is not a pseudo-version or if the time stamp -// embedded in the pseudo-version is not a valid time. -func PseudoVersionTime(v string) (time.Time, error) { - _, timestamp, _, _, err := parsePseudoVersion(v) - if err != nil { - return time.Time{}, err - } - t, err := time.Parse("20060102150405", timestamp) - if err != nil { - return time.Time{}, &InvalidVersionError{ - Version: v, - Pseudo: true, - Err: fmt.Errorf("malformed time %q", timestamp), - } - } - return t, nil -} - -// PseudoVersionRev returns the revision identifier of the pseudo-version v. -// It returns an error if v is not a pseudo-version. -func PseudoVersionRev(v string) (rev string, err error) { - _, _, rev, _, err = parsePseudoVersion(v) - return -} - -// PseudoVersionBase returns the canonical parent version, if any, upon which -// the pseudo-version v is based. -// -// If v has no parent version (that is, if it is "vX.0.0-[…]"), -// PseudoVersionBase returns the empty string and a nil error. -func PseudoVersionBase(v string) (string, error) { - base, _, _, build, err := parsePseudoVersion(v) - if err != nil { - return "", err - } - - switch pre := semver.Prerelease(base); pre { - case "": - // vX.0.0-yyyymmddhhmmss-abcdef123456 → "" - if build != "" { - // Pseudo-versions of the form vX.0.0-yyyymmddhhmmss-abcdef123456+incompatible - // are nonsensical: the "vX.0.0-" prefix implies that there is no parent tag, - // but the "+incompatible" suffix implies that the major version of - // the parent tag is not compatible with the module's import path. - // - // There are a few such entries in the index generated by proxy.golang.org, - // but we believe those entries were generated by the proxy itself. - return "", &InvalidVersionError{ - Version: v, - Pseudo: true, - Err: fmt.Errorf("lacks base version, but has build metadata %q", build), - } - } - return "", nil - - case "-0": - // vX.Y.(Z+1)-0.yyyymmddhhmmss-abcdef123456 → vX.Y.Z - // vX.Y.(Z+1)-0.yyyymmddhhmmss-abcdef123456+incompatible → vX.Y.Z+incompatible - base = strings.TrimSuffix(base, pre) - i := strings.LastIndexByte(base, '.') - if i < 0 { - panic("base from parsePseudoVersion missing patch number: " + base) - } - patch := decDecimal(base[i+1:]) - if patch == "" { - // vX.0.0-0 is invalid, but has been observed in the wild in the index - // generated by requests to proxy.golang.org. - // - // NOTE(bcmills): I cannot find a historical bug that accounts for - // pseudo-versions of this form, nor have I seen such versions in any - // actual go.mod files. If we find actual examples of this form and a - // reasonable theory of how they came into existence, it seems fine to - // treat them as equivalent to vX.0.0 (especially since the invalid - // pseudo-versions have lower precedence than the real ones). For now, we - // reject them. - return "", &InvalidVersionError{ - Version: v, - Pseudo: true, - Err: fmt.Errorf("version before %s would have negative patch number", base), - } - } - return base[:i+1] + patch + build, nil - - default: - // vX.Y.Z-pre.0.yyyymmddhhmmss-abcdef123456 → vX.Y.Z-pre - // vX.Y.Z-pre.0.yyyymmddhhmmss-abcdef123456+incompatible → vX.Y.Z-pre+incompatible - if !strings.HasSuffix(base, ".0") { - panic(`base from parsePseudoVersion missing ".0" before date: ` + base) - } - return strings.TrimSuffix(base, ".0") + build, nil - } -} - -var errPseudoSyntax = errors.New("syntax error") - -func parsePseudoVersion(v string) (base, timestamp, rev, build string, err error) { - if !IsPseudoVersion(v) { - return "", "", "", "", &InvalidVersionError{ - Version: v, - Pseudo: true, - Err: errPseudoSyntax, - } - } - build = semver.Build(v) - v = strings.TrimSuffix(v, build) - j := strings.LastIndex(v, "-") - v, rev = v[:j], v[j+1:] - i := strings.LastIndex(v, "-") - if j := strings.LastIndex(v, "."); j > i { - base = v[:j] // "vX.Y.Z-pre.0" or "vX.Y.(Z+1)-0" - timestamp = v[j+1:] - } else { - base = v[:i] // "vX.0.0" - timestamp = v[i+1:] - } - return base, timestamp, rev, build, nil -} |