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config.go
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config.go
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package cliutil
import (
"fmt"
"go/types"
"go.uber.org/multierr"
"golang.org/x/tools/go/packages"
)
// Config has configurations of static analysis.
type Config struct {
Packages *packages.Config
}
// NewConfigInDir creates [Config] and set dir to Packages.Dir.
// Packages.Mode will be same with DefaultConfig.Packages.Mode.
func NewConfigInDir(dir string) *Config {
return &Config{
Packages: &packages.Config{
Mode: DefaultConfig.Packages.Mode,
Dir: dir,
},
}
}
// TypeOf returns the value of types.Type which represented by the name.
// If any type could not be found, TypeOf returns [ErrNotFound] as the second return value.
func (conf *Config) TypeOf(name string) (types.Type, error) {
first, second, _, ptr := Split(name)
if second == "" {
obj := types.Universe.Lookup(first)
if obj == nil {
return nil, fmt.Errorf("%s: %w", name, ErrNotFound)
}
typ := obj.Type()
if ptr {
typ = types.NewPointer(typ)
}
return typ, nil
}
pkg, err := conf.load(first)
if err != nil {
return nil, fmt.Errorf("load %s: %w", first, err)
}
obj := pkg.Scope().Lookup(second)
if obj == nil {
return nil, fmt.Errorf("%s: %w", name, ErrNotFound)
}
typ := obj.Type()
if ptr {
typ = types.NewPointer(typ)
}
return typ, nil
}
// ObjectOf returns the value of types.Object which represented by the name.
// If any object could not be found, ObjectOf returns [ErrNotFound] as the second return value.
func (conf *Config) ObjectOf(name string) (types.Object, error) {
first, second, third, ptr := Split(name)
if second == "" {
obj := types.Universe.Lookup(name)
if obj == nil {
return nil, fmt.Errorf("%s: %w", name, ErrNotFound)
}
return obj, nil
}
if third == "" && ptr {
return nil, fmt.Errorf("%s: %w", name, ErrNotFound)
}
pkg, err := conf.load(first)
if err != nil {
return nil, fmt.Errorf("load %s: %w", first, err)
}
obj := pkg.Scope().Lookup(second)
if obj == nil {
return nil, fmt.Errorf("%s: %w", name, ErrNotFound)
}
if third == "" {
return obj, nil
}
fieldOrMethod, _, _ := types.LookupFieldOrMethod(obj.Type(), ptr, pkg, third)
if fieldOrMethod == nil {
return nil, fmt.Errorf("%s: %w", name, ErrNotFound)
}
return fieldOrMethod, nil
}
// CurrentPackage load current pacakge.
func (conf *Config) CurrentPackage() (*types.Package, error) {
return conf.load("")
}
func (conf *Config) load(name string) (*types.Package, error) {
var patterns []string
if name != "" {
patterns = []string{name}
}
pkgs, err := packages.Load(conf.Packages, patterns...)
if err != nil {
return nil, fmt.Errorf("could not find package: %w", err)
}
if len(pkgs) == 0 {
return nil, fmt.Errorf("could not find package: %q", name)
}
if len(pkgs[0].Errors) != 0 {
var rerr error
for _, err := range pkgs[0].Errors {
rerr = multierr.Append(rerr, err)
return nil, rerr
}
}
tpkg := pkgs[0].Types
if tpkg == nil {
return nil, fmt.Errorf("could not find package: %q", name)
}
return tpkg, nil
}