为什么这里是`*invalid type`而不是`*Games`？

huangapple
go评论157阅读模式
英文:

Why is this `*invalid type` instead of `*Games`?

问题

如果你在这里运行分析包：https://github.com/frederikhors/iss-goland-invalid-type，使用以下命令：

  1. go run ./analysis

它会打印出：

  1. field.Name: id - field.Type: string
  2. field.Name: name - field.Type: string        
  3. field.Name: games - field.Type: *invalid type

我不明白的是为什么我得到的是 *invalid type 而不是 *Games？

代码部分：

  • analyis/main.go:
  1. package main
  3. import (
  4. 	"go/types";
  6. 	"golang.org/x/tools/go/packages"
  7. )
  9. func main() {
  10. 	playerModel := LoadPackage("./player.go")
  12. 	var playerStruct *types.Struct
  14. 	for _, entity := range playerModel.Types.Scope().Names() {
  15. 		if entity == "Player" {
  17. 			playerStruct = GetStruct(entity, playerModel)
  19. 			break
  20. 		}
  21. 	}
  23. 	for i := 0; i < playerStruct.NumFields(); i++ {
  24. 		field := playerStruct.Field(i)
  26. 		println("field.Name: " + field.Name() + " - field.Type: " + field.Type().String())
  27. 	}
  28. }
  30. func LoadPackage(path string) *packages.Package {
  31. 	const mode = packages.NeedTypes |
  32. 		packages.NeedName |
  33. 		packages.NeedSyntax |
  34. 		packages.NeedFiles |
  35. 		packages.NeedTypesInfo |
  36. 		packages.NeedTypesInfo |
  37. 		packages.NeedModule
  39. 	cfg := &packages.Config{Mode: mode}
  41. 	pkgs, err := packages.Load(cfg, path)
  42. 	if err != nil {
  43. 		panic(err)
  44. 	}
  46. 	return pkgs[0]
  47. }
  49. func GetStruct(structName string, pkg *packages.Package) *types.Struct {
  50. 	foundStruct := pkg.Types.Scope().Lookup(structName)
  52. 	if foundStruct == nil {
  53. 		return nil
  54. 	}
  56. 	res, _ := foundStruct.Type().Underlying().(*types.Struct)
  58. 	return res
  59. }
  • player.go:
  1. type Player struct {
  2. 	id    string
  3. 	name  string
  4. 	games *Games
  5. }
  • games.go:
  1. package main
  3. type Games struct {
  4. 	wins   []string
  5. 	losses []string
  6. }
英文:

If you run the analysis package here: https://github.com/frederikhors/iss-goland-invalid-type with:

  1. go run ./analysis

it will print:

  1. field.Name: id - field.Type: string
  2. field.Name: name - field.Type: string        
  3. field.Name: games - field.Type: *invalid type

What I don't understand is why I'm having *invalid type instead of *Games?

Code

  • analyis/main.go:
  1. package main
  3. import (
  4. 	&quot;go/types&quot;
  6. 	&quot;golang.org/x/tools/go/packages&quot;
  7. )
  9. func main() {
  10. 	playerModel := LoadPackage(&quot;./player.go&quot;)
  12. 	var playerStruct *types.Struct
  14. 	for _, entity := range playerModel.Types.Scope().Names() {
  15. 		if entity == &quot;Player&quot; {
  17. 			playerStruct = GetStruct(entity, playerModel)
  19. 			break
  20. 		}
  21. 	}
  23. 	for i := 0; i &lt; playerStruct.NumFields(); i++ {
  24. 		field := playerStruct.Field(i)
  26. 		println(&quot;field.Name: &quot; + field.Name() + &quot; - field.Type: &quot; + field.Type().String())
  27. 	}
  28. }
  30. func LoadPackage(path string) *packages.Package {
  31. 	const mode = packages.NeedTypes |
  32. 		packages.NeedName |
  33. 		packages.NeedSyntax |
  34. 		packages.NeedFiles |
  35. 		packages.NeedTypesInfo |
  36. 		packages.NeedTypesInfo |
  37. 		packages.NeedModule
  39. 	cfg := &amp;packages.Config{Mode: mode}
  41. 	pkgs, err := packages.Load(cfg, path)
  42. 	if err != nil {
  43. 		panic(err)
  44. 	}
  46. 	return pkgs[0]
  47. }
  49. func GetStruct(structName string, pkg *packages.Package) *types.Struct {
  50. 	foundStruct := pkg.Types.Scope().Lookup(structName)
  52. 	if foundStruct == nil {
  53. 		return nil
  54. 	}
  56. 	res, _ := foundStruct.Type().Underlying().(*types.Struct)
  58. 	return res
  59. }
  • player.go:
  1. type Player struct {
  2. 	id    string
  3. 	name  string
  4. 	games *Games
  5. }
  • games.go:
  1. package main
  3. type Games struct {
  4. 	wins   []string
  5. 	losses []string
  6. }

答案1

得分: 3

你明确地只加载了一个文件，使用LoadPackage("./player.go")。而这个文件并不是声明Games类型的文件。要加载整个包中所有类型的信息，你需要加载整个包。

你需要使用LoadPackage(".")。

英文:

You are explicitly loading only a single file with LoadPackage(&quot;./player.go&quot;). And that file is not the one in which the Games type is declared. To load information on all types of a package you need to load the whole package.

You need to use LoadPackage(&quot;.&quot;).

huangapple
  • 本文由 发表于 2022年1月29日 20:50:39
  • 转载请务必保留本文链接：https://go.coder-hub.com/70905567.html
  • analysis
  • go
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