dev-tools/mage/semver.go

// Copyright Elasticsearch B.V. and/or licensed to Elasticsearch B.V. under one
// or more contributor license agreements. Licensed under the Elastic License 2.0;
// you may not use this file except in compliance with the Elastic License 2.0.

package mage

import (
	"fmt"
	"regexp"
	"strconv"
)

// SemanticVersionRegex regex for semantic version
var SemanticVersionRegex = regexp.MustCompile(`(?m)^(\d+)\.(\d+)(?:\.(\d+))?`)

// SemanticVersion contains version details
type SemanticVersion struct {
	Major, Minor, Patch int
}

// NewSemanticVersion return a new SemanticVersion parsed from string in the
// format of 'x.y' or 'x.y.z'.
func NewSemanticVersion(s string) (*SemanticVersion, error) {
	matches := SemanticVersionRegex.FindStringSubmatch(s)
	if len(matches) < 4 {
		return nil, fmt.Errorf("invalid version format %q", s)
	}

	major, _ := strconv.Atoi(matches[1])
	Minor, _ := strconv.Atoi(matches[2])
	Patch, _ := strconv.Atoi(matches[3])
	return &SemanticVersion{major, Minor, Patch}, nil
}

// LessThan return true iff s is less than x.
func (s *SemanticVersion) LessThan(x *SemanticVersion) bool {
	if s.Major != x.Major {
		return s.Major < x.Major
	}
	if s.Minor != x.Minor {
		return s.Minor < x.Minor
	}
	return s.Patch < x.Patch
}

// LessThanOrEqual return true iff s is less than or equal to x.
func (s *SemanticVersion) LessThanOrEqual(x *SemanticVersion) bool {
	if s.LessThan(x) {
		return true
	}
	return !x.LessThan(s)
}

func (s SemanticVersion) String() string {
	return fmt.Sprintf("%d.%d.%d", s.Major, s.Minor, s.Patch)
}