为什么这个‘*无效类型’而不是‘*Games`’？

Question

如果您在这里运行分析包：https://github.com/frederikhors/iss-goland-invalid-type：

go run ./analysis

它将印刷：

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

我不明白为什么我要用*invalid type而不是*Games

代码

• analyis/main.go:

package main

import (
    "go/types"

    "golang.org/x/tools/go/packages"
)

func main() {
    playerModel := LoadPackage("./player.go")

    var playerStruct *types.Struct

    for _, entity := range playerModel.Types.Scope().Names() {
        if entity == "Player" {

            playerStruct = GetStruct(entity, playerModel)

            break
        }
    }

    for i := 0; i < playerStruct.NumFields(); i++ {
        field := playerStruct.Field(i)

        println("field.Name: " + field.Name() + " - field.Type: " + field.Type().String())
    }
}

func LoadPackage(path string) *packages.Package {
    const mode = packages.NeedTypes |
        packages.NeedName |
        packages.NeedSyntax |
        packages.NeedFiles |
        packages.NeedTypesInfo |
        packages.NeedTypesInfo |
        packages.NeedModule

    cfg := &packages.Config{Mode: mode}

    pkgs, err := packages.Load(cfg, path)
    if err != nil {
        panic(err)
    }

    return pkgs[0]
}

func GetStruct(structName string, pkg *packages.Package) *types.Struct {
    foundStruct := pkg.Types.Scope().Lookup(structName)

    if foundStruct == nil {
        return nil
    }

    res, _ := foundStruct.Type().Underlying().(*types.Struct)

    return res
}

• player.go:

type Player struct {
    id    string
    name  string
    games *Games
}

• games.go:

package main

type Games struct {
    wins   []string
    losses []string
}

Answer 1

您只使用LoadPackage("./player.go")显式加载单个文件。并且该文件不是声明Games类型的文件。要加载有关包的所有类型的信息，您需要加载整个包。

您需要使用LoadPackage(".")。