424 lines
9.9 KiB
Go
424 lines
9.9 KiB
Go
package semver
|
|
|
|
import (
|
|
"errors"
|
|
"fmt"
|
|
"regexp"
|
|
"strings"
|
|
)
|
|
|
|
// Constraints is one or more constraint that a semantic version can be
|
|
// checked against.
|
|
type Constraints struct {
|
|
constraints [][]*constraint
|
|
}
|
|
|
|
// NewConstraint returns a Constraints instance that a Version instance can
|
|
// be checked against. If there is a parse error it will be returned.
|
|
func NewConstraint(c string) (*Constraints, error) {
|
|
|
|
// Rewrite - ranges into a comparison operation.
|
|
c = rewriteRange(c)
|
|
|
|
ors := strings.Split(c, "||")
|
|
or := make([][]*constraint, len(ors))
|
|
for k, v := range ors {
|
|
cs := strings.Split(v, ",")
|
|
result := make([]*constraint, len(cs))
|
|
for i, s := range cs {
|
|
pc, err := parseConstraint(s)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
result[i] = pc
|
|
}
|
|
or[k] = result
|
|
}
|
|
|
|
o := &Constraints{constraints: or}
|
|
return o, nil
|
|
}
|
|
|
|
// Check tests if a version satisfies the constraints.
|
|
func (cs Constraints) Check(v *Version) bool {
|
|
// loop over the ORs and check the inner ANDs
|
|
for _, o := range cs.constraints {
|
|
joy := true
|
|
for _, c := range o {
|
|
if !c.check(v) {
|
|
joy = false
|
|
break
|
|
}
|
|
}
|
|
|
|
if joy {
|
|
return true
|
|
}
|
|
}
|
|
|
|
return false
|
|
}
|
|
|
|
// Validate checks if a version satisfies a constraint. If not a slice of
|
|
// reasons for the failure are returned in addition to a bool.
|
|
func (cs Constraints) Validate(v *Version) (bool, []error) {
|
|
// loop over the ORs and check the inner ANDs
|
|
var e []error
|
|
|
|
// Capture the prerelease message only once. When it happens the first time
|
|
// this var is marked
|
|
var prerelesase bool
|
|
for _, o := range cs.constraints {
|
|
joy := true
|
|
for _, c := range o {
|
|
// Before running the check handle the case there the version is
|
|
// a prerelease and the check is not searching for prereleases.
|
|
if c.con.pre == "" && v.pre != "" {
|
|
if !prerelesase {
|
|
em := fmt.Errorf("%s is a prerelease version and the constraint is only looking for release versions", v)
|
|
e = append(e, em)
|
|
prerelesase = true
|
|
}
|
|
joy = false
|
|
|
|
} else {
|
|
|
|
if !c.check(v) {
|
|
em := fmt.Errorf(c.msg, v, c.orig)
|
|
e = append(e, em)
|
|
joy = false
|
|
}
|
|
}
|
|
}
|
|
|
|
if joy {
|
|
return true, []error{}
|
|
}
|
|
}
|
|
|
|
return false, e
|
|
}
|
|
|
|
var constraintOps map[string]cfunc
|
|
var constraintMsg map[string]string
|
|
var constraintRegex *regexp.Regexp
|
|
|
|
func init() {
|
|
constraintOps = map[string]cfunc{
|
|
"": constraintTildeOrEqual,
|
|
"=": constraintTildeOrEqual,
|
|
"!=": constraintNotEqual,
|
|
">": constraintGreaterThan,
|
|
"<": constraintLessThan,
|
|
">=": constraintGreaterThanEqual,
|
|
"=>": constraintGreaterThanEqual,
|
|
"<=": constraintLessThanEqual,
|
|
"=<": constraintLessThanEqual,
|
|
"~": constraintTilde,
|
|
"~>": constraintTilde,
|
|
"^": constraintCaret,
|
|
}
|
|
|
|
constraintMsg = map[string]string{
|
|
"": "%s is not equal to %s",
|
|
"=": "%s is not equal to %s",
|
|
"!=": "%s is equal to %s",
|
|
">": "%s is less than or equal to %s",
|
|
"<": "%s is greater than or equal to %s",
|
|
">=": "%s is less than %s",
|
|
"=>": "%s is less than %s",
|
|
"<=": "%s is greater than %s",
|
|
"=<": "%s is greater than %s",
|
|
"~": "%s does not have same major and minor version as %s",
|
|
"~>": "%s does not have same major and minor version as %s",
|
|
"^": "%s does not have same major version as %s",
|
|
}
|
|
|
|
ops := make([]string, 0, len(constraintOps))
|
|
for k := range constraintOps {
|
|
ops = append(ops, regexp.QuoteMeta(k))
|
|
}
|
|
|
|
constraintRegex = regexp.MustCompile(fmt.Sprintf(
|
|
`^\s*(%s)\s*(%s)\s*$`,
|
|
strings.Join(ops, "|"),
|
|
cvRegex))
|
|
|
|
constraintRangeRegex = regexp.MustCompile(fmt.Sprintf(
|
|
`\s*(%s)\s+-\s+(%s)\s*`,
|
|
cvRegex, cvRegex))
|
|
}
|
|
|
|
// An individual constraint
|
|
type constraint struct {
|
|
// The callback function for the restraint. It performs the logic for
|
|
// the constraint.
|
|
function cfunc
|
|
|
|
msg string
|
|
|
|
// The version used in the constraint check. For example, if a constraint
|
|
// is '<= 2.0.0' the con a version instance representing 2.0.0.
|
|
con *Version
|
|
|
|
// The original parsed version (e.g., 4.x from != 4.x)
|
|
orig string
|
|
|
|
// When an x is used as part of the version (e.g., 1.x)
|
|
minorDirty bool
|
|
dirty bool
|
|
patchDirty bool
|
|
}
|
|
|
|
// Check if a version meets the constraint
|
|
func (c *constraint) check(v *Version) bool {
|
|
return c.function(v, c)
|
|
}
|
|
|
|
type cfunc func(v *Version, c *constraint) bool
|
|
|
|
func parseConstraint(c string) (*constraint, error) {
|
|
m := constraintRegex.FindStringSubmatch(c)
|
|
if m == nil {
|
|
return nil, fmt.Errorf("improper constraint: %s", c)
|
|
}
|
|
|
|
ver := m[2]
|
|
orig := ver
|
|
minorDirty := false
|
|
patchDirty := false
|
|
dirty := false
|
|
if isX(m[3]) {
|
|
ver = "0.0.0"
|
|
dirty = true
|
|
} else if isX(strings.TrimPrefix(m[4], ".")) || m[4] == "" {
|
|
minorDirty = true
|
|
dirty = true
|
|
ver = fmt.Sprintf("%s.0.0%s", m[3], m[6])
|
|
} else if isX(strings.TrimPrefix(m[5], ".")) {
|
|
dirty = true
|
|
patchDirty = true
|
|
ver = fmt.Sprintf("%s%s.0%s", m[3], m[4], m[6])
|
|
}
|
|
|
|
con, err := NewVersion(ver)
|
|
if err != nil {
|
|
|
|
// The constraintRegex should catch any regex parsing errors. So,
|
|
// we should never get here.
|
|
return nil, errors.New("constraint Parser Error")
|
|
}
|
|
|
|
cs := &constraint{
|
|
function: constraintOps[m[1]],
|
|
msg: constraintMsg[m[1]],
|
|
con: con,
|
|
orig: orig,
|
|
minorDirty: minorDirty,
|
|
patchDirty: patchDirty,
|
|
dirty: dirty,
|
|
}
|
|
return cs, nil
|
|
}
|
|
|
|
// Constraint functions
|
|
func constraintNotEqual(v *Version, c *constraint) bool {
|
|
if c.dirty {
|
|
|
|
// If there is a pre-release on the version but the constraint isn't looking
|
|
// for them assume that pre-releases are not compatible. See issue 21 for
|
|
// more details.
|
|
if v.Prerelease() != "" && c.con.Prerelease() == "" {
|
|
return false
|
|
}
|
|
|
|
if c.con.Major() != v.Major() {
|
|
return true
|
|
}
|
|
if c.con.Minor() != v.Minor() && !c.minorDirty {
|
|
return true
|
|
} else if c.minorDirty {
|
|
return false
|
|
}
|
|
|
|
return false
|
|
}
|
|
|
|
return !v.Equal(c.con)
|
|
}
|
|
|
|
func constraintGreaterThan(v *Version, c *constraint) bool {
|
|
|
|
// If there is a pre-release on the version but the constraint isn't looking
|
|
// for them assume that pre-releases are not compatible. See issue 21 for
|
|
// more details.
|
|
if v.Prerelease() != "" && c.con.Prerelease() == "" {
|
|
return false
|
|
}
|
|
|
|
return v.Compare(c.con) == 1
|
|
}
|
|
|
|
func constraintLessThan(v *Version, c *constraint) bool {
|
|
// If there is a pre-release on the version but the constraint isn't looking
|
|
// for them assume that pre-releases are not compatible. See issue 21 for
|
|
// more details.
|
|
if v.Prerelease() != "" && c.con.Prerelease() == "" {
|
|
return false
|
|
}
|
|
|
|
if !c.dirty {
|
|
return v.Compare(c.con) < 0
|
|
}
|
|
|
|
if v.Major() > c.con.Major() {
|
|
return false
|
|
} else if v.Minor() > c.con.Minor() && !c.minorDirty {
|
|
return false
|
|
}
|
|
|
|
return true
|
|
}
|
|
|
|
func constraintGreaterThanEqual(v *Version, c *constraint) bool {
|
|
|
|
// If there is a pre-release on the version but the constraint isn't looking
|
|
// for them assume that pre-releases are not compatible. See issue 21 for
|
|
// more details.
|
|
if v.Prerelease() != "" && c.con.Prerelease() == "" {
|
|
return false
|
|
}
|
|
|
|
return v.Compare(c.con) >= 0
|
|
}
|
|
|
|
func constraintLessThanEqual(v *Version, c *constraint) bool {
|
|
// If there is a pre-release on the version but the constraint isn't looking
|
|
// for them assume that pre-releases are not compatible. See issue 21 for
|
|
// more details.
|
|
if v.Prerelease() != "" && c.con.Prerelease() == "" {
|
|
return false
|
|
}
|
|
|
|
if !c.dirty {
|
|
return v.Compare(c.con) <= 0
|
|
}
|
|
|
|
if v.Major() > c.con.Major() {
|
|
return false
|
|
} else if v.Minor() > c.con.Minor() && !c.minorDirty {
|
|
return false
|
|
}
|
|
|
|
return true
|
|
}
|
|
|
|
// ~*, ~>* --> >= 0.0.0 (any)
|
|
// ~2, ~2.x, ~2.x.x, ~>2, ~>2.x ~>2.x.x --> >=2.0.0, <3.0.0
|
|
// ~2.0, ~2.0.x, ~>2.0, ~>2.0.x --> >=2.0.0, <2.1.0
|
|
// ~1.2, ~1.2.x, ~>1.2, ~>1.2.x --> >=1.2.0, <1.3.0
|
|
// ~1.2.3, ~>1.2.3 --> >=1.2.3, <1.3.0
|
|
// ~1.2.0, ~>1.2.0 --> >=1.2.0, <1.3.0
|
|
func constraintTilde(v *Version, c *constraint) bool {
|
|
// If there is a pre-release on the version but the constraint isn't looking
|
|
// for them assume that pre-releases are not compatible. See issue 21 for
|
|
// more details.
|
|
if v.Prerelease() != "" && c.con.Prerelease() == "" {
|
|
return false
|
|
}
|
|
|
|
if v.LessThan(c.con) {
|
|
return false
|
|
}
|
|
|
|
// ~0.0.0 is a special case where all constraints are accepted. It's
|
|
// equivalent to >= 0.0.0.
|
|
if c.con.Major() == 0 && c.con.Minor() == 0 && c.con.Patch() == 0 &&
|
|
!c.minorDirty && !c.patchDirty {
|
|
return true
|
|
}
|
|
|
|
if v.Major() != c.con.Major() {
|
|
return false
|
|
}
|
|
|
|
if v.Minor() != c.con.Minor() && !c.minorDirty {
|
|
return false
|
|
}
|
|
|
|
return true
|
|
}
|
|
|
|
// When there is a .x (dirty) status it automatically opts in to ~. Otherwise
|
|
// it's a straight =
|
|
func constraintTildeOrEqual(v *Version, c *constraint) bool {
|
|
// If there is a pre-release on the version but the constraint isn't looking
|
|
// for them assume that pre-releases are not compatible. See issue 21 for
|
|
// more details.
|
|
if v.Prerelease() != "" && c.con.Prerelease() == "" {
|
|
return false
|
|
}
|
|
|
|
if c.dirty {
|
|
c.msg = constraintMsg["~"]
|
|
return constraintTilde(v, c)
|
|
}
|
|
|
|
return v.Equal(c.con)
|
|
}
|
|
|
|
// ^* --> (any)
|
|
// ^2, ^2.x, ^2.x.x --> >=2.0.0, <3.0.0
|
|
// ^2.0, ^2.0.x --> >=2.0.0, <3.0.0
|
|
// ^1.2, ^1.2.x --> >=1.2.0, <2.0.0
|
|
// ^1.2.3 --> >=1.2.3, <2.0.0
|
|
// ^1.2.0 --> >=1.2.0, <2.0.0
|
|
func constraintCaret(v *Version, c *constraint) bool {
|
|
// If there is a pre-release on the version but the constraint isn't looking
|
|
// for them assume that pre-releases are not compatible. See issue 21 for
|
|
// more details.
|
|
if v.Prerelease() != "" && c.con.Prerelease() == "" {
|
|
return false
|
|
}
|
|
|
|
if v.LessThan(c.con) {
|
|
return false
|
|
}
|
|
|
|
if v.Major() != c.con.Major() {
|
|
return false
|
|
}
|
|
|
|
return true
|
|
}
|
|
|
|
var constraintRangeRegex *regexp.Regexp
|
|
|
|
const cvRegex string = `v?([0-9|x|X|\*]+)(\.[0-9|x|X|\*]+)?(\.[0-9|x|X|\*]+)?` +
|
|
`(-([0-9A-Za-z\-]+(\.[0-9A-Za-z\-]+)*))?` +
|
|
`(\+([0-9A-Za-z\-]+(\.[0-9A-Za-z\-]+)*))?`
|
|
|
|
func isX(x string) bool {
|
|
switch x {
|
|
case "x", "*", "X":
|
|
return true
|
|
default:
|
|
return false
|
|
}
|
|
}
|
|
|
|
func rewriteRange(i string) string {
|
|
m := constraintRangeRegex.FindAllStringSubmatch(i, -1)
|
|
if m == nil {
|
|
return i
|
|
}
|
|
o := i
|
|
for _, v := range m {
|
|
t := fmt.Sprintf(">= %s, <= %s", v[1], v[11])
|
|
o = strings.Replace(o, v[0], t, 1)
|
|
}
|
|
|
|
return o
|
|
}
|