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package semver
import (
"fmt"
"strings"
"unicode"
)
type comparator func(Version, Version) bool
var (
compEQ comparator = func(v1 Version, v2 Version) bool {
return v1.Compare(v2) == 0
}
compNE = func(v1 Version, v2 Version) bool {
return v1.Compare(v2) != 0
}
compGT = func(v1 Version, v2 Version) bool {
return v1.Compare(v2) == 1
}
compGE = func(v1 Version, v2 Version) bool {
return v1.Compare(v2) >= 0
}
compLT = func(v1 Version, v2 Version) bool {
return v1.Compare(v2) == -1
}
compLE = func(v1 Version, v2 Version) bool {
return v1.Compare(v2) <= 0
}
)
type versionRange struct {
v Version
c comparator
}
// rangeFunc creates a Range from the given versionRange.
func (vr *versionRange) rangeFunc() Range {
return Range(func(v Version) bool {
return vr.c(v, vr.v)
})
}
// Range represents a range of versions.
// A Range can be used to check if a Version satisfies it:
//
// range, err := semver.ParseRange(">1.0.0 <2.0.0")
// range(semver.MustParse("1.1.1") // returns true
type Range func(Version) bool
// OR combines the existing Range with another Range using logical OR.
func (rf Range) OR(f Range) Range {
return Range(func(v Version) bool {
return rf(v) || f(v)
})
}
// AND combines the existing Range with another Range using logical AND.
func (rf Range) AND(f Range) Range {
return Range(func(v Version) bool {
return rf(v) && f(v)
})
}
// ParseRange parses a range and returns a Range.
// If the range could not be parsed an error is returned.
//
// Valid ranges are:
// - "<1.0.0"
// - "<=1.0.0"
// - ">1.0.0"
// - ">=1.0.0"
// - "1.0.0", "=1.0.0", "==1.0.0"
// - "!1.0.0", "!=1.0.0"
//
// A Range can consist of multiple ranges separated by space:
// Ranges can be linked by logical AND:
// - ">1.0.0 <2.0.0" would match between both ranges, so "1.1.1" and "1.8.7" but not "1.0.0" or "2.0.0"
// - ">1.0.0 <3.0.0 !2.0.3-beta.2" would match every version between 1.0.0 and 3.0.0 except 2.0.3-beta.2
//
// Ranges can also be linked by logical OR:
// - "<2.0.0 || >=3.0.0" would match "1.x.x" and "3.x.x" but not "2.x.x"
//
// AND has a higher precedence than OR. It's not possible to use brackets.
//
// Ranges can be combined by both AND and OR
//
// - `>1.0.0 <2.0.0 || >3.0.0 !4.2.1` would match `1.2.3`, `1.9.9`, `3.1.1`, but not `4.2.1`, `2.1.1`
func ParseRange(s string) (Range, error) {
parts := splitAndTrim(s)
orParts, err := splitORParts(parts)
if err != nil {
return nil, err
}
var orFn Range
for _, p := range orParts {
var andFn Range
for _, ap := range p {
opStr, vStr, err := splitComparatorVersion(ap)
if err != nil {
return nil, err
}
vr, err := buildVersionRange(opStr, vStr)
if err != nil {
return nil, fmt.Errorf("Could not parse Range %q: %s", ap, err)
}
rf := vr.rangeFunc()
// Set function
if andFn == nil {
andFn = rf
} else { // Combine with existing function
andFn = andFn.AND(rf)
}
}
if orFn == nil {
orFn = andFn
} else {
orFn = orFn.OR(andFn)
}
}
return orFn, nil
}
// splitORParts splits the already cleaned parts by '||'.
// Checks for invalid positions of the operator and returns an
// error if found.
func splitORParts(parts []string) ([][]string, error) {
var ORparts [][]string
last := 0
for i, p := range parts {
if p == "||" {
if i == 0 {
return nil, fmt.Errorf("First element in range is '||'")
}
ORparts = append(ORparts, parts[last:i])
last = i + 1
}
}
if last == len(parts) {
return nil, fmt.Errorf("Last element in range is '||'")
}
ORparts = append(ORparts, parts[last:])
return ORparts, nil
}
// buildVersionRange takes a slice of 2: operator and version
// and builds a versionRange, otherwise an error.
func buildVersionRange(opStr, vStr string) (*versionRange, error) {
c := parseComparator(opStr)
if c == nil {
return nil, fmt.Errorf("Could not parse comparator %q in %q", opStr, strings.Join([]string{opStr, vStr}, ""))
}
v, err := Parse(vStr)
if err != nil {
return nil, fmt.Errorf("Could not parse version %q in %q: %s", vStr, strings.Join([]string{opStr, vStr}, ""), err)
}
return &versionRange{
v: v,
c: c,
}, nil
}
// splitAndTrim splits a range string by spaces and cleans leading and trailing spaces
func splitAndTrim(s string) (result []string) {
last := 0
for i := 0; i < len(s); i++ {
if s[i] == ' ' {
if last < i-1 {
result = append(result, s[last:i])
}
last = i + 1
}
}
if last < len(s)-1 {
result = append(result, s[last:])
}
// parts := strings.Split(s, " ")
// for _, x := range parts {
// if s := strings.TrimSpace(x); len(s) != 0 {
// result = append(result, s)
// }
// }
return
}
// splitComparatorVersion splits the comparator from the version.
// Spaces between the comparator and the version are not allowed.
// Input must be free of leading or trailing spaces.
func splitComparatorVersion(s string) (string, string, error) {
i := strings.IndexFunc(s, unicode.IsDigit)
if i == -1 {
return "", "", fmt.Errorf("Could not get version from string: %q", s)
}
return strings.TrimSpace(s[0:i]), s[i:], nil
}
func parseComparator(s string) comparator {
switch s {
case "==":
fallthrough
case "":
fallthrough
case "=":
return compEQ
case ">":
return compGT
case ">=":
return compGE
case "<":
return compLT
case "<=":
return compLE
case "!":
fallthrough
case "!=":
return compNE
}
return nil
}
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