mirror of
https://github.com/bolucat/Archive.git
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99 lines
2.5 KiB
Go
99 lines
2.5 KiB
Go
// Copyright (C) 2023 mieru authors
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//
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// This program is free software: you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// This program is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with this program. If not, see <https://www.gnu.org/licenses/>.
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package version
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import (
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"fmt"
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"regexp"
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"strconv"
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)
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var (
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versionFmt = regexp.MustCompile(`^(\d+)\.(\d+)\.(\d+)`)
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tagFmt = regexp.MustCompile(`^v(\d+)\.(\d+)\.(\d+)`)
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)
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// Version defines the components of version number.
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type Version struct {
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Major int
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Minor int
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Patch int
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}
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// String returns the string representation of version number, e.g. "1.0.0".
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func (v Version) String() string {
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return fmt.Sprintf("%d.%d.%d", v.Major, v.Minor, v.Patch)
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}
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// ToTag returns the associated tag name of the version, e.g. "v1.0.0".
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func (v Version) ToTag() string {
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return fmt.Sprintf("v%d.%d.%d", v.Major, v.Minor, v.Patch)
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}
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// IsLessThan returns true if the current version is less than the compared version.
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func (v Version) IsLessThan(another Version) bool {
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if v.Major > another.Major {
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return false
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}
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if v.Major < another.Major {
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return true
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}
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if v.Minor > another.Minor {
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return false
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}
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if v.Minor < another.Minor {
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return true
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}
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if v.Patch >= another.Patch {
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return false
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}
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return true
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}
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// Parse constructs the version from a string.
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func Parse(s string) (Version, error) {
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matches := versionFmt.FindStringSubmatch(s)
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if len(matches) != 4 {
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return Version{}, fmt.Errorf("failed to parse version %s", s)
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}
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major, _ := strconv.Atoi(matches[1])
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minor, _ := strconv.Atoi(matches[2])
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patch, _ := strconv.Atoi(matches[3])
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return Version{
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Major: major,
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Minor: minor,
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Patch: patch,
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}, nil
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}
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// ParseTag constructs the version from a tag name.
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func ParseTag(tag string) (Version, error) {
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matches := tagFmt.FindStringSubmatch(tag)
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if len(matches) != 4 {
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return Version{}, fmt.Errorf("failed to parse tag %s", tag)
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}
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major, _ := strconv.Atoi(matches[1])
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minor, _ := strconv.Atoi(matches[2])
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patch, _ := strconv.Atoi(matches[3])
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return Version{
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Major: major,
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Minor: minor,
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Patch: patch,
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}, nil
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}
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