//ParsePackage parses package and filling info structure.
//It's filling info about all internal packages even if they
//are not imported in the root package.
func ParsePackage(pkgName string, info *types.Info) (*types.Package, *token.FileSet, error) {
collectImporter := new(importer.CollectInfoImporter)
collectImporter.Info = info
var resultPkg *types.Package
var resultFset *token.FileSet
parsedPackages := make(map[string]bool)
notParsedPackage := pkgName
for len(notParsedPackage) > 0 {
collectImporter.Pkg = notParsedPackage
pkg, fset, err := collectImporter.Collect()
if err != nil {
return nil, nil, err
}
//Filling results only from first package
//that was passed as argument to function
if resultPkg == nil {
resultPkg = pkg
resultFset = fset
}
parsedPackages[notParsedPackage] = true
//Searching for a new package that was not parsed before
notParsedPackage = ""
files, err := fs.GetUnusedSources(pkgName, fset)
if err != nil {
return nil, nil, err
}
for _, f := range files {
newNotParsedPackage := fs.GetPackagePath(f)
if !parsedPackages[newNotParsedPackage] {
notParsedPackage = newNotParsedPackage
break
} else {
util.Info("package %s has been already parsed, however %s file is still unused", newNotParsedPackage, f)
}
}
}
return resultPkg, resultFset, nil
}
func isUsed(def *Definition) bool {
used := true
if len(def.Usages) == 0 {
used = false
} else {
//Checking pathes of usages to not count internal
hasExternalUsages := false
util.Debug("checking [%s]", def.Name)
for _, u := range def.Usages {
pkgPath := ""
if def.Pkg != nil {
pkgPath = def.Pkg.Path()
} else if dotIdx := strings.LastIndex(def.Name, "."); dotIdx >= 0 {
pkgPath = def.Name[0:dotIdx]
}
util.Debug("checking [%v]", u.Pos)
if u.Pos.IsValid() && fs.GetPackagePath(u.Pos.Filename) != pkgPath {
hasExternalUsages = true
break
}
}
used = hasExternalUsages
}
if !used {
//Check all interfaces
for _, i := range def.Interfaces {
if isUsed(i) {
used = true
break
}
}
}
return used
}