forked from maxbrunsfeld/counterfeiter
/
loader.go
156 lines (147 loc) · 3.62 KB
/
loader.go
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package generator
import (
"fmt"
"go/build"
"go/types"
"log"
"path/filepath"
"reflect"
"strings"
"golang.org/x/tools/go/packages"
"golang.org/x/tools/imports"
)
func (f *Fake) loadPackages(c Cacher, workingDir string) error {
log.Println("loading packages...")
p, ok := c.Load(f.TargetPackage)
if ok {
f.Packages = p
log.Printf("loaded %v packages from cache\n", len(f.Packages))
return nil
}
importPath := f.TargetPackage
if !filepath.IsAbs(importPath) {
ctx := getBuildContext(workingDir)
bp, err := ctx.Import(f.TargetPackage, workingDir, build.FindOnly)
if err != nil {
return err
}
importPath = bp.ImportPath
}
p, err := packages.Load(&packages.Config{
Mode: packages.NeedName | packages.NeedFiles | packages.NeedImports | packages.NeedDeps | packages.NeedTypes | packages.NeedTypesInfo,
Dir: workingDir,
Tests: true,
}, importPath)
if err != nil {
return err
}
for i := range p {
if len(p[i].Errors) > 0 {
if i == 0 {
err = p[i].Errors[0]
}
for j := range p[i].Errors {
log.Printf("error loading packages: %v", strings.TrimPrefix(fmt.Sprintf("%v", p[i].Errors[j]), "-: "))
}
}
}
if err != nil {
return err
}
f.Packages = p
c.Store(f.TargetPackage, p)
log.Printf("loaded %v packages\n", len(f.Packages))
return nil
}
func (f *Fake) findPackage() error {
var target *types.TypeName
var pkg *packages.Package
for i := range f.Packages {
if f.Packages[i].Types == nil || f.Packages[i].Types.Scope() == nil {
continue
}
pkg = f.Packages[i]
if f.Mode == Package {
break
}
targetName := f.TargetName
if f.IsGeneric {
targetName = strings.Split(targetName, "[")[0]
}
raw := pkg.Types.Scope().Lookup(targetName)
if raw != nil {
if typeName, ok := raw.(*types.TypeName); ok {
target = typeName
break
}
}
pkg = nil
}
if pkg == nil {
switch f.Mode {
case Package:
return fmt.Errorf("cannot find package with name: %s", f.TargetPackage)
case InterfaceOrFunction:
return fmt.Errorf("cannot find package with target: %s", f.TargetName)
}
}
f.Target = target
f.Package = pkg
f.TargetPackage = imports.VendorlessPath(pkg.PkgPath)
t := f.Imports.Add(pkg.Name, f.TargetPackage)
f.TargetAlias = t.Alias
if f.Mode != Package {
f.TargetName = target.Name()
}
if f.Mode == InterfaceOrFunction {
if !f.IsInterface() && !f.IsFunction() {
return fmt.Errorf("cannot generate an fake for %s because it is not an interface or function", f.TargetName)
}
}
if f.IsInterface() {
log.Printf("Found interface with name: [%s]\n", f.TargetName)
}
if f.IsFunction() {
log.Printf("Found function with name: [%s]\n", f.TargetName)
}
if f.Mode == Package {
log.Printf("Found package with name: [%s]\n", f.TargetPackage)
}
return nil
}
// addImportsFor inspects the given type and adds imports to the fake if importable
// types are found.
func (f *Fake) addImportsFor(typ types.Type) {
if typ == nil {
return
}
switch t := typ.(type) {
case *types.Basic:
return
case *types.Pointer:
f.addImportsFor(t.Elem())
case *types.Map:
f.addImportsFor(t.Key())
f.addImportsFor(t.Elem())
case *types.Chan:
f.addImportsFor(t.Elem())
case *types.Named:
if t.Obj() != nil && t.Obj().Pkg() != nil {
f.Imports.Add(t.Obj().Pkg().Name(), t.Obj().Pkg().Path())
}
case *types.Slice:
f.addImportsFor(t.Elem())
case *types.Array:
f.addImportsFor(t.Elem())
case *types.Interface:
return
case *types.Signature:
f.addTypesForMethod(t)
case *types.Struct:
for i := 0; i < t.NumFields(); i++ {
f.addImportsFor(t.Field(i).Type())
}
default:
log.Printf("!!! WARNING: Missing case for type %s\n", reflect.TypeOf(typ).String())
}
}