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feat(typex): typex for univeral reflect and go type abstract
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,332 @@ | ||
| package typex | ||
|
|
||
| import ( | ||
| "go/token" | ||
| "go/types" | ||
| "reflect" | ||
| "strconv" | ||
| "strings" | ||
| "sync" | ||
|
|
||
| "golang.org/x/tools/go/packages" | ||
|
|
||
| "github.com/xoctopus/x/misc/must" | ||
| ) | ||
|
|
||
| var ( | ||
| gGoTypeCache = sync.Map{} | ||
| gBasicsCache = sync.Map{} | ||
| gPackagesCache = sync.Map{} | ||
| ) | ||
|
|
||
| var ( | ||
| LoadFiles = packages.NeedName | packages.NeedFiles | packages.NeedCompiledGoFiles | ||
| LoadImports = LoadFiles | packages.NeedImports | ||
| LoadTypes = LoadImports | packages.NeedTypes | packages.NeedTypesSizes | ||
| ) | ||
|
|
||
| func init() { | ||
| for i := range types.Typ { | ||
| basic := types.Typ[i] | ||
| gBasicsCache.Store( | ||
| types.TypeString(basic, nil), | ||
| func() types.Type { return basic }, | ||
| ) | ||
| } | ||
| gBasicsCache.Store("interface {}", func() types.Type { | ||
| return types.NewInterfaceType(nil, nil) | ||
| }) | ||
| gBasicsCache.Store("any", func() types.Type { | ||
| return types.NewInterfaceType(nil, nil) | ||
| }) | ||
| gBasicsCache.Store("comparable", func() types.Type { | ||
| return types.NewInterfaceType(nil, nil) | ||
| }) | ||
| gBasicsCache.Store("error", func() types.Type { | ||
| return NewPackage("errors"). | ||
| Scope(). | ||
| Lookup("New"). | ||
| Type(). | ||
| Underlying().(*types.Signature). | ||
| Results(). | ||
| At(0). | ||
| Type() | ||
| }) | ||
| } | ||
|
|
||
| func TypeByImportAndName(path, name string) types.Type { | ||
| if path == "" { | ||
| return TypeByID(name) | ||
| } | ||
| return TypeByID(path + "." + name) | ||
| } | ||
|
|
||
| func TypeByID(id string) (t types.Type) { | ||
| if v, ok := gGoTypeCache.Load(id); ok { | ||
| return v.(types.Type) | ||
| } | ||
|
|
||
| defer func() { | ||
| if t == nil { | ||
| t = types.Typ[types.Invalid] | ||
| } | ||
| gGoTypeCache.Store(id, t) | ||
| }() | ||
|
|
||
| if id == "" { | ||
| return nil | ||
| } | ||
|
|
||
| if v, ok := gBasicsCache.Load(id); ok { | ||
| t = v.(func() types.Type)() | ||
| return | ||
| } | ||
|
|
||
| // map[x] | ||
| if idxMapLsb := strings.Index(id, "map["); idxMapLsb == 0 { | ||
| idxMapRsb := strings.Index(id, "]") | ||
| if idxMapRsb == -1 { | ||
| return nil | ||
| } | ||
| kt := TypeByID(id[4:idxMapRsb]) | ||
| if kt == nil || kt == types.Typ[types.Invalid] { | ||
| return nil | ||
| } | ||
| vt := TypeByID(id[idxMapRsb+1:]) | ||
| if vt == nil || vt == types.Typ[types.Invalid] { | ||
| return nil | ||
| } | ||
| t = types.NewMap(kt, vt) | ||
| return t | ||
| } | ||
|
|
||
| // []x [n]x | ||
| idxLsb := strings.Index(id, "[") | ||
| if idxLsb == 0 { | ||
| idxRsb := strings.Index(id, "]") | ||
| if idxRsb == -1 { | ||
| return nil | ||
| } | ||
| elem := TypeByID(id[idxRsb+1:]) | ||
| if elem == nil || elem == types.Typ[types.Invalid] { | ||
| return nil | ||
| } | ||
| if idxRsb == idxLsb+1 { | ||
| t = types.NewSlice(elem) | ||
| return t | ||
| } | ||
| n, err := strconv.ParseInt(id[1:idxRsb], 10, 64) | ||
| if err != nil { | ||
| return t | ||
| } | ||
| t = types.NewArray(elem, n) | ||
| return t | ||
| } | ||
|
|
||
| // path.Type | ||
| if idxLsb == -1 { | ||
| if idxDot := strings.LastIndex(id, "."); idxDot > 0 { | ||
| pkg := NewPackage(id[0:idxDot]) | ||
| if pkg == nil { | ||
| return nil | ||
| } | ||
| tpe, ok := pkg.Scope().Lookup(id[idxDot+1:]).(*types.TypeName) | ||
| if !ok || tpe == nil { | ||
| return nil | ||
| } | ||
| t = types.NewTypeName(token.NoPos, pkg, tpe.Name(), tpe.Type()).Type() | ||
| // t = tpe.Type() | ||
| return t | ||
| } | ||
| return t | ||
| } | ||
|
|
||
| // path.Type[generics parameters...] | ||
| idxRsb := strings.Index(id, "]") | ||
| if idxRsb == -1 { | ||
| return nil | ||
| } | ||
| typeid := id[0:idxLsb] | ||
| idxDot := strings.LastIndex(typeid, ".") | ||
| if idxDot == -1 { | ||
| return nil | ||
| } | ||
| pkg := NewPackage(typeid[:idxDot]) | ||
| if pkg == nil { | ||
| return nil | ||
| } | ||
| tpe, ok := pkg.Scope().Lookup(typeid[idxDot+1:]).(*types.TypeName) | ||
| if !ok || tpe == nil { | ||
| return nil | ||
| } | ||
| named, ok := tpe.Type().(*types.Named) | ||
| if !ok { | ||
| return nil | ||
| } | ||
| cloned := types.NewNamed(tpe, tpe.Type().Underlying(), nil) | ||
| for i := 0; i < named.NumMethods(); i++ { | ||
| cloned.AddMethod(named.Method(i)) | ||
| } | ||
| paramNames := strings.Split(id[idxLsb+1:idxRsb], ",") | ||
| paramList := named.TypeParams() | ||
| if len(paramNames) == 0 || paramList == nil || paramList.Len() != len(paramNames) { | ||
| return nil | ||
| } | ||
| paramTypes := make([]*types.TypeParam, paramList.Len()) | ||
| for i := 0; i < paramList.Len(); i++ { | ||
| paramType := TypeByID(paramNames[i]) | ||
| if paramType == nil || paramType == types.Typ[types.Invalid] { | ||
| return nil | ||
| } | ||
| paramTypes[i] = types.NewTypeParam(paramList.At(i).Obj(), paramType) | ||
| } | ||
| cloned.SetTypeParams(paramTypes) | ||
| t = cloned | ||
| return t | ||
| } | ||
|
|
||
| func NewPackage(path string) *types.Package { | ||
| if path == "" { | ||
| return nil | ||
| } | ||
|
|
||
| if v, ok := gPackagesCache.Load(path); ok { | ||
| return v.(*types.Package) | ||
| } | ||
|
|
||
| pkgs, err := packages.Load(&packages.Config{ | ||
| Overlay: make(map[string][]byte), | ||
| Tests: true, | ||
| Mode: LoadTypes, | ||
| }, path) | ||
| must.NoErrorWrap(err, "failed to load packages from %s", path) | ||
|
|
||
| // if len(pkgs[0].Errors) != 0 { | ||
| // return nil | ||
| // } | ||
|
|
||
| pkg := pkgs[0].Types | ||
| gPackagesCache.Store(path, pkg) | ||
|
|
||
| return pkg | ||
| } | ||
|
|
||
| func NewGoTypeFromReflectType(t reflect.Type) types.Type { | ||
| if t == nil { | ||
| return nil | ||
| } | ||
|
|
||
| refs := 0 | ||
| for t.Kind() == reflect.Pointer { | ||
| refs++ | ||
| t = t.Elem() | ||
| } | ||
|
|
||
| tpe, pkg := t.Name(), t.PkgPath() | ||
| if tpe == "error" && pkg == "" { | ||
| return must.BeTrueV(gBasicsCache.Load("error")).(func() types.Type)() | ||
| } | ||
|
|
||
| var gt types.Type | ||
| if pkg != "" { | ||
| gt = TypeByID(pkg + "." + tpe) | ||
| } else { | ||
| gt = underlying(t) | ||
| } | ||
|
|
||
| for refs > 0 { | ||
| gt = types.NewPointer(gt) | ||
| refs-- | ||
| } | ||
| return gt | ||
| } | ||
|
|
||
| func underlying(t reflect.Type) types.Type { | ||
| if tt, ok := ReflectKindToTypesKind[t.Kind()]; ok { | ||
| return types.Typ[tt] | ||
| } | ||
|
|
||
| switch t.Kind() { | ||
| case reflect.Array: | ||
| return types.NewArray( | ||
| NewGoTypeFromReflectType(t.Elem()), | ||
| int64(t.Len()), | ||
| ) | ||
| case reflect.Chan: | ||
| var dir = types.SendRecv | ||
| switch t.ChanDir() { | ||
| case reflect.RecvDir: // 1 | ||
| dir = types.RecvOnly // 2 | ||
| case reflect.SendDir: // 2 | ||
| dir = types.SendOnly // 1 | ||
| case reflect.BothDir: // 3 | ||
| dir = types.SendRecv // 0 | ||
| } | ||
| return types.NewChan(dir, NewGoTypeFromReflectType(t.Elem())) | ||
| case reflect.Slice: | ||
| return types.NewSlice( | ||
| NewGoTypeFromReflectType(t.Elem()), | ||
| ) | ||
| case reflect.Map: | ||
| return types.NewMap( | ||
| NewGoTypeFromReflectType(t.Key()), | ||
| NewGoTypeFromReflectType(t.Elem()), | ||
| ) | ||
| case reflect.Func: | ||
| ins := make([]*types.Var, t.NumIn()) | ||
| outs := make([]*types.Var, t.NumOut()) | ||
| for i := range ins { | ||
| in := t.In(i) | ||
| ins[i] = types.NewParam( | ||
| 0, | ||
| NewPackage(in.PkgPath()), | ||
| "", | ||
| NewGoTypeFromReflectType(in), | ||
| ) | ||
| } | ||
| for i := range outs { | ||
| out := t.Out(i) | ||
| outs[i] = types.NewParam( | ||
| 0, | ||
| NewPackage(out.PkgPath()), | ||
| "", | ||
| NewGoTypeFromReflectType(out), | ||
| ) | ||
| } | ||
| return types.NewSignatureType( | ||
| nil, nil, nil, | ||
| types.NewTuple(ins...), | ||
| types.NewTuple(outs...), | ||
| t.IsVariadic(), | ||
| ) | ||
| case reflect.Interface: | ||
| fns := make([]*types.Func, t.NumMethod()) | ||
| for i := range fns { | ||
| f := t.Method(i) | ||
| fns[i] = types.NewFunc( | ||
| 0, | ||
| NewPackage(f.PkgPath), | ||
| f.Name, | ||
| NewGoTypeFromReflectType(f.Type).(*types.Signature), | ||
| ) | ||
| } | ||
| return types.NewInterfaceType(fns, nil).Complete() | ||
| case reflect.Struct: | ||
| fields := make([]*types.Var, t.NumField()) | ||
| tags := make([]string, len(fields)) | ||
| for i := range fields { | ||
| f := t.Field(i) | ||
| fields[i] = types.NewField( | ||
| 0, | ||
| NewPackage(f.PkgPath), | ||
| f.Name, | ||
| NewGoTypeFromReflectType(f.Type), | ||
| f.Anonymous, | ||
| ) | ||
| tags[i] = string(f.Tag) | ||
| } | ||
| return types.NewStruct(fields, tags) | ||
| default: // [never entered this case] reflect.Invalid, reflect.Pointer | ||
| return nil | ||
| } | ||
| } |
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