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main.go
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main.go
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package main
import (
"syscall/js"
"github.com/Masterminds/semver/v3"
)
func versionToMap(version *semver.Version) map[string]any {
return map[string]any{
"original": version.Original(),
"major": version.Major(),
"minor": version.Minor(),
"patch": version.Patch(),
"prerelease": version.Prerelease(),
"metadata": version.Metadata(),
}
}
func versionFromJsVal(version js.Value) *semver.Version {
if version.IsUndefined() {
return nil
}
return semver.New(
uint64(version.Get("major").Int()),
uint64(version.Get("minor").Int()),
uint64(version.Get("patch").Int()),
version.Get("prerelease").String(),
version.Get("metadata").String(),
)
}
func promisify(originalFunc func(this js.Value, args []js.Value) (any, error)) js.Func {
return js.FuncOf(func(this js.Value, args []js.Value) any {
handler := js.FuncOf(func(_ js.Value, innerArgs []js.Value) any {
resolve := innerArgs[0]
reject := innerArgs[1]
go func() {
result, err := originalFunc(this, args)
if err != nil {
errorConstructor := js.Global().Get("Error")
errorObject := errorConstructor.New(err.Error())
reject.Invoke(errorObject)
} else {
resolve.Invoke(js.ValueOf(result))
}
}()
return nil
})
promiseConstructor := js.Global().Get("Promise")
return promiseConstructor.New(handler)
})
}
func parseVersionFunc(this js.Value, args []js.Value) (any, error) {
version, err := semver.StrictNewVersion(args[0].String())
if err != nil {
return nil, err
}
return versionToMap(version), nil
}
func parseConstraintFunc(this js.Value, args []js.Value) (any, error) {
constraint, err := semver.NewConstraint(args[0].String())
if err != nil {
return nil, err
}
return constraint.String(), nil
}
func matchVersion(this js.Value, args []js.Value) (any, error) {
version := versionFromJsVal(args[0])
if version == nil {
return nil, nil
}
constraint, err := semver.NewConstraint(args[1].String())
if err != nil {
return nil, err
}
_, errors := constraint.Validate(version)
errorStrings := make([]any, len(errors))
for i, err := range errors {
errorStrings[i] = err.Error()
}
return errorStrings, nil
}
func main() {
ch := make(chan struct{}, 0)
js.Global().Set("parseVersion", promisify(parseVersionFunc))
js.Global().Set("parseConstraint", promisify(parseConstraintFunc))
js.Global().Set("matchVersion", promisify(matchVersion))
<-ch
}