forgejo-federation/vendor/github.com/mcuadros/go-version/group.go
2016-11-04 08:43:11 +01:00

269 lines
7.4 KiB
Go

package version
import (
"regexp"
"strconv"
"strings"
)
type ConstraintGroup struct {
constraints []*Constraint
}
// Return a new NewConstrainGroup
func NewConstrainGroup() *ConstraintGroup {
group := new(ConstraintGroup)
return group
}
// Return a new NewConstrainGroup and create the constraints based on a string
//
// Version constraints can be specified in a few different ways:
//
// Exact version: You can specify the exact version of a package, for
// example 1.0.2.
//
// Range: By using comparison operators you can specify ranges of valid versions.
// Valid operators are >, >=, <, <=, !=. An example range would be >=1.0. You can
// define multiple ranges, separated by a comma: >=1.0,<2.0.
//
// Wildcard: You can specify a pattern with a * wildcard. 1.0.* is the equivalent
// of >=1.0,<1.1.
//
// Next Significant Release (Tilde Operator): The ~ operator is best explained by
// example: ~1.2 is equivalent to >=1.2,<2.0, while ~1.2.3 is equivalent to
// >=1.2.3,<1.3. As you can see it is mostly useful for projects respecting
// semantic versioning. A common usage would be to mark the minimum minor
// version you depend on, like ~1.2 (which allows anything up to, but not
// including, 2.0). Since in theory there should be no backwards compatibility
// breaks until 2.0, that works well. Another way of looking at it is that
// using ~ specifies a minimum version, but allows the last digit specified
// to go up.
//
// By default only stable releases are taken into consideration. If you would like
// to also get RC, beta, alpha or dev versions of your dependencies you can do so
// using stability flags. To change that for all packages instead of doing per
// dependency you can also use the minimum-stability setting.
//
// From: http://getcomposer.org/doc/01-basic-usage.md#package-versions
func NewConstrainGroupFromString(name string) *ConstraintGroup {
group := new(ConstraintGroup)
group.fromString(name)
return group
}
// Adds a Contraint to the group
func (self *ConstraintGroup) AddConstraint(constraint ...*Constraint) {
if self.constraints == nil {
self.constraints = make([]*Constraint, 0)
}
self.constraints = append(self.constraints, constraint...)
}
// Return all the constraints
func (self *ConstraintGroup) GetConstraints() []*Constraint {
return self.constraints
}
// Match a given version againts the group
//
// Usage
// c := version.NewConstrainGroupFromString(">2.0,<=3.0")
// c.Match("2.5.0beta")
// Returns: true
//
// c := version.NewConstrainGroupFromString("~1.2.3")
// c.Match("1.2.3.5")
// Returns: true
func (self *ConstraintGroup) Match(version string) bool {
for _, constraint := range self.constraints {
if constraint.Match(version) == false {
return false
}
}
return true
}
func (self *ConstraintGroup) fromString(constraint string) bool {
result := RegFind(`(?i)^([^,\s]*?)@(stable|RC|beta|alpha|dev)$`, constraint)
if result != nil {
constraint = result[1]
if constraint == "" {
constraint = "*"
}
}
result = RegFind(`(?i)^(dev-[^,\s@]+?|[^,\s@]+?\.x-dev)#.+$`, constraint)
if result != nil {
if result[1] != "" {
constraint = result[1]
}
}
constraints := RegSplit(`\s*,\s*`, strings.Trim(constraint, " "))
if len(constraints) > 1 {
for _, part := range constraints {
self.AddConstraint(self.parseConstraint(part)...)
}
return true
}
self.AddConstraint(self.parseConstraint(constraints[0])...)
return true
}
func (self *ConstraintGroup) parseConstraint(constraint string) []*Constraint {
stabilityModifier := ""
result := RegFind(`(?i)^([^,\s]+?)@(stable|RC|beta|alpha|dev)$`, constraint)
if result != nil {
constraint = result[1]
if result[2] != "stable" {
stabilityModifier = result[2]
}
}
result = RegFind(`^[x*](\.[x*])*$`, constraint)
if result != nil {
return make([]*Constraint, 0)
}
highVersion := ""
lowVersion := ""
result = RegFind(`(?i)^~(\d+)(?:\.(\d+))?(?:\.(\d+))?(?:\.(\d+))?`+modifierRegex+`?$`, constraint)
if result != nil {
if len(result) > 4 && result[4] != "" {
last, _ := strconv.Atoi(result[3])
highVersion = result[1] + "." + result[2] + "." + strconv.Itoa(last+1) + ".0-dev"
lowVersion = result[1] + "." + result[2] + "." + result[3] + "." + result[4]
} else if len(result) > 3 && result[3] != "" {
last, _ := strconv.Atoi(result[2])
highVersion = result[1] + "." + strconv.Itoa(last+1) + ".0.0-dev"
lowVersion = result[1] + "." + result[2] + "." + result[3] + ".0"
} else {
last, _ := strconv.Atoi(result[1])
highVersion = strconv.Itoa(last+1) + ".0.0.0-dev"
if len(result) > 2 && result[2] != "" {
lowVersion = result[1] + "." + result[2] + ".0.0"
} else {
lowVersion = result[1] + ".0.0.0"
}
}
if len(result) > 5 && result[5] != "" {
lowVersion = lowVersion + "-" + expandStability(result[5])
}
if len(result) > 6 && result[6] != "" {
lowVersion = lowVersion + result[6]
}
if len(result) > 7 && result[7] != "" {
lowVersion = lowVersion + "-dev"
}
return []*Constraint{
{">=", lowVersion},
{"<", highVersion},
}
}
result = RegFind(`^(\d+)(?:\.(\d+))?(?:\.(\d+))?\.[x*]$`, constraint)
if result != nil {
if len(result) > 3 && result[3] != "" {
highVersion = result[1] + "." + result[2] + "." + result[3] + ".9999999"
if result[3] == "0" {
last, _ := strconv.Atoi(result[2])
lowVersion = result[1] + "." + strconv.Itoa(last-1) + ".9999999.9999999"
} else {
last, _ := strconv.Atoi(result[3])
lowVersion = result[1] + "." + result[2] + "." + strconv.Itoa(last-1) + ".9999999"
}
} else if len(result) > 2 && result[2] != "" {
highVersion = result[1] + "." + result[2] + ".9999999.9999999"
if result[2] == "0" {
last, _ := strconv.Atoi(result[1])
lowVersion = strconv.Itoa(last-1) + ".9999999.9999999.9999999"
} else {
last, _ := strconv.Atoi(result[2])
lowVersion = result[1] + "." + strconv.Itoa(last-1) + ".9999999.9999999"
}
} else {
highVersion = result[1] + ".9999999.9999999.9999999"
if result[1] == "0" {
return []*Constraint{{"<", highVersion}}
} else {
last, _ := strconv.Atoi(result[1])
lowVersion = strconv.Itoa(last-1) + ".9999999.9999999.9999999"
}
}
return []*Constraint{
{">", lowVersion},
{"<", highVersion},
}
}
// match operators constraints
result = RegFind(`^(<>|!=|>=?|<=?|==?)?\s*(.*)`, constraint)
if result != nil {
version := Normalize(result[2])
if stabilityModifier != "" && parseStability(version) == "stable" {
version = version + "-" + stabilityModifier
} else if result[1] == "<" {
match := RegFind(`(?i)-stable$`, result[2])
if match == nil {
version = version + "-dev"
}
}
if len(result) > 1 && result[1] != "" {
return []*Constraint{{result[1], version}}
} else {
return []*Constraint{{"=", version}}
}
}
return []*Constraint{{constraint, stabilityModifier}}
}
func RegFind(pattern, subject string) []string {
reg := regexp.MustCompile(pattern)
matched := reg.FindAllStringSubmatch(subject, -1)
if matched != nil {
return matched[0]
}
return nil
}
func RegSplit(pattern, subject string) []string {
reg := regexp.MustCompile(pattern)
indexes := reg.FindAllStringIndex(subject, -1)
laststart := 0
result := make([]string, len(indexes)+1)
for i, element := range indexes {
result[i] = subject[laststart:element[0]]
laststart = element[1]
}
result[len(indexes)] = subject[laststart:len(subject)]
return result
}