mirror of
https://github.com/superseriousbusiness/gotosocial.git
synced 2024-11-25 05:06:38 +00:00
595 lines
16 KiB
Go
595 lines
16 KiB
Go
package semver
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import (
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"bytes"
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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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// TODO: Find a way to validate and fetch all the constraints in a simpler form
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// Validate the segment
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if !validConstraintRegex.MatchString(v) {
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return nil, fmt.Errorf("improper constraint: %s", v)
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}
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cs := findConstraintRegex.FindAllString(v, -1)
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if cs == nil {
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cs = append(cs, v)
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}
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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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// TODO(mattfarina): For v4 of this library consolidate the Check and Validate
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// functions as the underlying functions make that possible now.
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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 check, _ := c.check(v); !check {
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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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// Capture the prerelease message only once. When it happens the first time
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// this var is marked
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var prerelesase bool
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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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// Before running the check handle the case there the version is
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// a prerelease and the check is not searching for prereleases.
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if c.con.pre == "" && v.pre != "" {
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if !prerelesase {
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em := fmt.Errorf("%s is a prerelease version and the constraint is only looking for release versions", v)
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e = append(e, em)
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prerelesase = true
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}
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joy = false
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} else {
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if _, err := c.check(v); err != nil {
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e = append(e, err)
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joy = false
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}
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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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func (cs Constraints) String() string {
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buf := make([]string, len(cs.constraints))
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var tmp bytes.Buffer
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for k, v := range cs.constraints {
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tmp.Reset()
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vlen := len(v)
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for kk, c := range v {
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tmp.WriteString(c.string())
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// Space separate the AND conditions
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if vlen > 1 && kk < vlen-1 {
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tmp.WriteString(" ")
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}
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}
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buf[k] = tmp.String()
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}
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return strings.Join(buf, " || ")
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}
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// UnmarshalText implements the encoding.TextUnmarshaler interface.
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func (cs *Constraints) UnmarshalText(text []byte) error {
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temp, err := NewConstraint(string(text))
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if err != nil {
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return err
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}
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*cs = *temp
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return nil
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}
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// MarshalText implements the encoding.TextMarshaler interface.
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func (cs Constraints) MarshalText() ([]byte, error) {
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return []byte(cs.String()), nil
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}
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var constraintOps map[string]cfunc
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var constraintRegex *regexp.Regexp
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var constraintRangeRegex *regexp.Regexp
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// Used to find individual constraints within a multi-constraint string
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var findConstraintRegex *regexp.Regexp
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// Used to validate an segment of ANDs is valid
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var validConstraintRegex *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 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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ops := `=||!=|>|<|>=|=>|<=|=<|~|~>|\^`
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constraintRegex = regexp.MustCompile(fmt.Sprintf(
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`^\s*(%s)\s*(%s)\s*$`,
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ops,
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cvRegex))
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constraintRangeRegex = regexp.MustCompile(fmt.Sprintf(
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`\s*(%s)\s+-\s+(%s)\s*`,
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cvRegex, cvRegex))
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findConstraintRegex = regexp.MustCompile(fmt.Sprintf(
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`(%s)\s*(%s)`,
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ops,
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cvRegex))
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// The first time a constraint shows up will look slightly different from
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// future times it shows up due to a leading space or comma in a given
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// string.
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validConstraintRegex = regexp.MustCompile(fmt.Sprintf(
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`^(\s*(%s)\s*(%s)\s*)((?:\s+|,\s*)(%s)\s*(%s)\s*)*$`,
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ops,
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cvRegex,
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ops,
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cvRegex))
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}
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// An individual constraint
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type constraint struct {
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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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// The original operator for the constraint
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origfunc 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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patchDirty 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, error) {
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return constraintOps[c.origfunc](v, c)
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}
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// String prints an individual constraint into a string
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func (c *constraint) string() string {
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return c.origfunc + c.orig
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}
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type cfunc func(v *Version, c *constraint) (bool, error)
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func parseConstraint(c string) (*constraint, error) {
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if len(c) > 0 {
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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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cs := &constraint{
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orig: m[2],
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origfunc: m[1],
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}
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ver := m[2]
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minorDirty := false
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patchDirty := false
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dirty := false
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if isX(m[3]) || m[3] == "" {
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ver = fmt.Sprintf("0.0.0%s", m[6])
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dirty = true
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} else if isX(strings.TrimPrefix(m[4], ".")) || 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], ".")) || m[5] == "" {
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dirty = true
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patchDirty = 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.con = con
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cs.minorDirty = minorDirty
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cs.patchDirty = patchDirty
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cs.dirty = dirty
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return cs, nil
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}
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// The rest is the special case where an empty string was passed in which
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// is equivalent to * or >=0.0.0
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con, err := StrictNewVersion("0.0.0")
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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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con: con,
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orig: c,
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origfunc: "",
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minorDirty: false,
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patchDirty: false,
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dirty: true,
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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, error) {
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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, fmt.Errorf("%s is a prerelease version and the constraint is only looking for release versions", v)
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}
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if c.con.Major() != v.Major() {
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return true, nil
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}
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if c.con.Minor() != v.Minor() && !c.minorDirty {
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return true, nil
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} else if c.minorDirty {
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return false, fmt.Errorf("%s is equal to %s", v, c.orig)
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} else if c.con.Patch() != v.Patch() && !c.patchDirty {
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return true, nil
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} else if c.patchDirty {
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// Need to handle prereleases if present
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if v.Prerelease() != "" || c.con.Prerelease() != "" {
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eq := comparePrerelease(v.Prerelease(), c.con.Prerelease()) != 0
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if eq {
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return true, nil
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}
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return false, fmt.Errorf("%s is equal to %s", v, c.orig)
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}
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return false, fmt.Errorf("%s is equal to %s", v, c.orig)
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}
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}
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eq := v.Equal(c.con)
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if eq {
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return false, fmt.Errorf("%s is equal to %s", v, c.orig)
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}
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return true, nil
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}
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func constraintGreaterThan(v *Version, c *constraint) (bool, error) {
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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, fmt.Errorf("%s is a prerelease version and the constraint is only looking for release versions", v)
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}
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var eq bool
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if !c.dirty {
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eq = v.Compare(c.con) == 1
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if eq {
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return true, nil
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}
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return false, fmt.Errorf("%s is less than or equal to %s", v, c.orig)
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}
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if v.Major() > c.con.Major() {
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return true, nil
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} else if v.Major() < c.con.Major() {
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return false, fmt.Errorf("%s is less than or equal to %s", v, c.orig)
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} else if c.minorDirty {
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// This is a range case such as >11. When the version is something like
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// 11.1.0 is it not > 11. For that we would need 12 or higher
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return false, fmt.Errorf("%s is less than or equal to %s", v, c.orig)
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} else if c.patchDirty {
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// This is for ranges such as >11.1. A version of 11.1.1 is not greater
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// which one of 11.2.1 is greater
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eq = v.Minor() > c.con.Minor()
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if eq {
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return true, nil
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}
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return false, fmt.Errorf("%s is less than or equal to %s", v, c.orig)
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}
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// If we have gotten here we are not comparing pre-preleases and can use the
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// Compare function to accomplish that.
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eq = v.Compare(c.con) == 1
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if eq {
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return true, nil
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}
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return false, fmt.Errorf("%s is less than or equal to %s", v, c.orig)
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}
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func constraintLessThan(v *Version, c *constraint) (bool, error) {
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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, fmt.Errorf("%s is a prerelease version and the constraint is only looking for release versions", v)
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}
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eq := v.Compare(c.con) < 0
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if eq {
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return true, nil
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}
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return false, fmt.Errorf("%s is greater than or equal to %s", v, c.orig)
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}
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func constraintGreaterThanEqual(v *Version, c *constraint) (bool, error) {
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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, fmt.Errorf("%s is a prerelease version and the constraint is only looking for release versions", v)
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}
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eq := v.Compare(c.con) >= 0
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if eq {
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return true, nil
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}
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return false, fmt.Errorf("%s is less than %s", v, c.orig)
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}
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func constraintLessThanEqual(v *Version, c *constraint) (bool, error) {
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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, fmt.Errorf("%s is a prerelease version and the constraint is only looking for release versions", v)
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}
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var eq bool
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if !c.dirty {
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eq = v.Compare(c.con) <= 0
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if eq {
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return true, nil
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}
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return false, fmt.Errorf("%s is greater than %s", v, c.orig)
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}
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if v.Major() > c.con.Major() {
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return false, fmt.Errorf("%s is greater than %s", v, c.orig)
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} else if v.Major() == c.con.Major() && v.Minor() > c.con.Minor() && !c.minorDirty {
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return false, fmt.Errorf("%s is greater than %s", v, c.orig)
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}
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return true, nil
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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, error) {
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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, fmt.Errorf("%s is a prerelease version and the constraint is only looking for release versions", v)
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}
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if v.LessThan(c.con) {
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return false, fmt.Errorf("%s is less than %s", v, c.orig)
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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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!c.minorDirty && !c.patchDirty {
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return true, nil
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}
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if v.Major() != c.con.Major() {
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return false, fmt.Errorf("%s does not have same major version as %s", v, c.orig)
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}
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if v.Minor() != c.con.Minor() && !c.minorDirty {
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return false, fmt.Errorf("%s does not have same major and minor version as %s", v, c.orig)
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}
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return true, nil
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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, error) {
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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, fmt.Errorf("%s is a prerelease version and the constraint is only looking for release versions", v)
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}
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if c.dirty {
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return constraintTilde(v, c)
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}
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eq := v.Equal(c.con)
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if eq {
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return true, nil
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}
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return false, fmt.Errorf("%s is not equal to %s", v, c.orig)
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}
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// ^* --> (any)
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// ^1.2.3 --> >=1.2.3 <2.0.0
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// ^1.2 --> >=1.2.0 <2.0.0
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// ^1 --> >=1.0.0 <2.0.0
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// ^0.2.3 --> >=0.2.3 <0.3.0
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// ^0.2 --> >=0.2.0 <0.3.0
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// ^0.0.3 --> >=0.0.3 <0.0.4
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// ^0.0 --> >=0.0.0 <0.1.0
|
|
// ^0 --> >=0.0.0 <1.0.0
|
|
func constraintCaret(v *Version, c *constraint) (bool, error) {
|
|
// 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, fmt.Errorf("%s is a prerelease version and the constraint is only looking for release versions", v)
|
|
}
|
|
|
|
// This less than handles prereleases
|
|
if v.LessThan(c.con) {
|
|
return false, fmt.Errorf("%s is less than %s", v, c.orig)
|
|
}
|
|
|
|
var eq bool
|
|
|
|
// ^ when the major > 0 is >=x.y.z < x+1
|
|
if c.con.Major() > 0 || c.minorDirty {
|
|
|
|
// ^ has to be within a major range for > 0. Everything less than was
|
|
// filtered out with the LessThan call above. This filters out those
|
|
// that greater but not within the same major range.
|
|
eq = v.Major() == c.con.Major()
|
|
if eq {
|
|
return true, nil
|
|
}
|
|
return false, fmt.Errorf("%s does not have same major version as %s", v, c.orig)
|
|
}
|
|
|
|
// ^ when the major is 0 and minor > 0 is >=0.y.z < 0.y+1
|
|
if c.con.Major() == 0 && v.Major() > 0 {
|
|
return false, fmt.Errorf("%s does not have same major version as %s", v, c.orig)
|
|
}
|
|
// If the con Minor is > 0 it is not dirty
|
|
if c.con.Minor() > 0 || c.patchDirty {
|
|
eq = v.Minor() == c.con.Minor()
|
|
if eq {
|
|
return true, nil
|
|
}
|
|
return false, fmt.Errorf("%s does not have same minor version as %s. Expected minor versions to match when constraint major version is 0", v, c.orig)
|
|
}
|
|
// ^ when the minor is 0 and minor > 0 is =0.0.z
|
|
if c.con.Minor() == 0 && v.Minor() > 0 {
|
|
return false, fmt.Errorf("%s does not have same minor version as %s", v, c.orig)
|
|
}
|
|
|
|
// At this point the major is 0 and the minor is 0 and not dirty. The patch
|
|
// is not dirty so we need to check if they are equal. If they are not equal
|
|
eq = c.con.Patch() == v.Patch()
|
|
if eq {
|
|
return true, nil
|
|
}
|
|
return false, fmt.Errorf("%s does not equal %s. Expect version and constraint to equal when major and minor versions are 0", v, c.orig)
|
|
}
|
|
|
|
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
|
|
}
|