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Merge pull request #38 from Stebalien/feat/imports
Fix import handling
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,99 @@ | ||
| package typegen | ||
|
|
||
| import ( | ||
| "fmt" | ||
| "reflect" | ||
| "sort" | ||
| "strings" | ||
| "sync" | ||
| ) | ||
|
|
||
| var ( | ||
| knownPackageNamesMu sync.Mutex | ||
| pkgNameToPkgPath = make(map[string]string) | ||
| pkgPathToPkgName = make(map[string]string) | ||
|
|
||
| defaultImports = []Import{ | ||
| {Name: "cbg", PkgPath: "github.com/whyrusleeping/cbor-gen"}, | ||
| {Name: "xerrors", PkgPath: "golang.org/x/xerrors"}, | ||
| } | ||
| ) | ||
|
|
||
| func init() { | ||
| for _, imp := range defaultImports { | ||
| if was, conflict := pkgNameToPkgPath[imp.Name]; conflict { | ||
| panic(fmt.Sprintf("reused pkg name %s for %s and %s", imp.Name, imp.PkgPath, was)) | ||
| } | ||
| if _, conflict := pkgPathToPkgName[imp.Name]; conflict { | ||
| panic(fmt.Sprintf("duplicate default import %s", imp.PkgPath)) | ||
| } | ||
| pkgNameToPkgPath[imp.Name] = imp.PkgPath | ||
| pkgPathToPkgName[imp.PkgPath] = imp.Name | ||
| } | ||
| } | ||
|
|
||
| func resolvePkgName(path, typeName string) string { | ||
| parts := strings.Split(typeName, ".") | ||
| if len(parts) != 2 { | ||
| panic(fmt.Sprintf("expected type to have a package name: %s", typeName)) | ||
| } | ||
| defaultName := parts[0] | ||
|
|
||
| knownPackageNamesMu.Lock() | ||
| defer knownPackageNamesMu.Unlock() | ||
|
|
||
| // Check for a known name and use it. | ||
| if name, ok := pkgPathToPkgName[path]; ok { | ||
| return name | ||
| } | ||
|
|
||
| // Allocate a name. | ||
| for i := 0; ; i++ { | ||
| tryName := defaultName | ||
| if i > 0 { | ||
| tryName = fmt.Sprintf("%s%d", defaultName, i) | ||
| } | ||
| if _, taken := pkgNameToPkgPath[tryName]; !taken { | ||
| pkgNameToPkgPath[tryName] = path | ||
| pkgPathToPkgName[path] = tryName | ||
| return tryName | ||
| } | ||
| } | ||
|
|
||
| } | ||
|
|
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| type Import struct { | ||
| Name, PkgPath string | ||
| } | ||
|
|
||
| func ImportsForType(currPkg string, t reflect.Type) []Import { | ||
| switch t.Kind() { | ||
| case reflect.Array, reflect.Slice, reflect.Ptr: | ||
| return ImportsForType(currPkg, t.Elem()) | ||
| case reflect.Map: | ||
| return dedupImports(append(ImportsForType(currPkg, t.Key()), ImportsForType(currPkg, t.Elem())...)) | ||
| default: | ||
| path := t.PkgPath() | ||
| if path == "" || path == currPkg { | ||
| // built-in or in current package. | ||
| return nil | ||
| } | ||
|
|
||
| return []Import{{PkgPath: path, Name: resolvePkgName(path, t.String())}} | ||
| } | ||
| } | ||
|
|
||
| func dedupImports(imps []Import) []Import { | ||
| impSet := make(map[string]string, len(imps)) | ||
| for _, imp := range imps { | ||
| impSet[imp.PkgPath] = imp.Name | ||
| } | ||
| deduped := make([]Import, 0, len(imps)) | ||
| for pkg, name := range impSet { | ||
| deduped = append(deduped, Import{Name: name, PkgPath: pkg}) | ||
| } | ||
| sort.Slice(deduped, func(i, j int) bool { | ||
| return deduped[i].PkgPath < deduped[j].PkgPath | ||
| }) | ||
| return deduped | ||
| } |
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