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