mirror of
https://github.com/restic/restic.git
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149 lines
4.2 KiB
Go
149 lines
4.2 KiB
Go
// Copyright 2017, The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE.md file.
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package cmpopts
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import (
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"fmt"
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"reflect"
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"unicode"
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"unicode/utf8"
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"github.com/google/go-cmp/cmp"
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)
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// IgnoreFields returns an Option that ignores exported fields of the
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// given names on a single struct type.
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// The struct type is specified by passing in a value of that type.
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//
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// The name may be a dot-delimited string (e.g., "Foo.Bar") to ignore a
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// specific sub-field that is embedded or nested within the parent struct.
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//
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// This does not handle unexported fields; use IgnoreUnexported instead.
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func IgnoreFields(typ interface{}, names ...string) cmp.Option {
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sf := newStructFilter(typ, names...)
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return cmp.FilterPath(sf.filter, cmp.Ignore())
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}
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// IgnoreTypes returns an Option that ignores all values assignable to
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// certain types, which are specified by passing in a value of each type.
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func IgnoreTypes(typs ...interface{}) cmp.Option {
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tf := newTypeFilter(typs...)
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return cmp.FilterPath(tf.filter, cmp.Ignore())
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}
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type typeFilter []reflect.Type
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func newTypeFilter(typs ...interface{}) (tf typeFilter) {
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for _, typ := range typs {
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t := reflect.TypeOf(typ)
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if t == nil {
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// This occurs if someone tries to pass in sync.Locker(nil)
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panic("cannot determine type; consider using IgnoreInterfaces")
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}
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tf = append(tf, t)
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}
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return tf
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}
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func (tf typeFilter) filter(p cmp.Path) bool {
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if len(p) < 1 {
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return false
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}
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t := p[len(p)-1].Type()
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for _, ti := range tf {
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if t.AssignableTo(ti) {
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return true
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}
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}
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return false
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}
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// IgnoreInterfaces returns an Option that ignores all values or references of
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// values assignable to certain interface types. These interfaces are specified
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// by passing in an anonymous struct with the interface types embedded in it.
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// For example, to ignore sync.Locker, pass in struct{sync.Locker}{}.
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func IgnoreInterfaces(ifaces interface{}) cmp.Option {
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tf := newIfaceFilter(ifaces)
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return cmp.FilterPath(tf.filter, cmp.Ignore())
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}
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type ifaceFilter []reflect.Type
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func newIfaceFilter(ifaces interface{}) (tf ifaceFilter) {
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t := reflect.TypeOf(ifaces)
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if ifaces == nil || t.Name() != "" || t.Kind() != reflect.Struct {
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panic("input must be an anonymous struct")
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}
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for i := 0; i < t.NumField(); i++ {
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fi := t.Field(i)
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switch {
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case !fi.Anonymous:
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panic("struct cannot have named fields")
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case fi.Type.Kind() != reflect.Interface:
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panic("embedded field must be an interface type")
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case fi.Type.NumMethod() == 0:
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// This matches everything; why would you ever want this?
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panic("cannot ignore empty interface")
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default:
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tf = append(tf, fi.Type)
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}
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}
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return tf
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}
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func (tf ifaceFilter) filter(p cmp.Path) bool {
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if len(p) < 1 {
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return false
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}
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t := p[len(p)-1].Type()
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for _, ti := range tf {
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if t.AssignableTo(ti) {
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return true
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}
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if t.Kind() != reflect.Ptr && reflect.PtrTo(t).AssignableTo(ti) {
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return true
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}
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}
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return false
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}
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// IgnoreUnexported returns an Option that only ignores the immediate unexported
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// fields of a struct, including anonymous fields of unexported types.
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// In particular, unexported fields within the struct's exported fields
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// of struct types, including anonymous fields, will not be ignored unless the
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// type of the field itself is also passed to IgnoreUnexported.
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func IgnoreUnexported(typs ...interface{}) cmp.Option {
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ux := newUnexportedFilter(typs...)
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return cmp.FilterPath(ux.filter, cmp.Ignore())
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}
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type unexportedFilter struct{ m map[reflect.Type]bool }
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func newUnexportedFilter(typs ...interface{}) unexportedFilter {
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ux := unexportedFilter{m: make(map[reflect.Type]bool)}
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for _, typ := range typs {
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t := reflect.TypeOf(typ)
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if t == nil || t.Kind() != reflect.Struct {
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panic(fmt.Sprintf("invalid struct type: %T", typ))
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}
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ux.m[t] = true
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}
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return ux
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}
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func (xf unexportedFilter) filter(p cmp.Path) bool {
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if len(p) < 2 {
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return false
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}
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sf, ok := p[len(p)-1].(cmp.StructField)
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if !ok {
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return false
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}
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return xf.m[p[len(p)-2].Type()] && !isExported(sf.Name())
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}
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// isExported reports whether the identifier is exported.
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func isExported(id string) bool {
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r, _ := utf8.DecodeRuneInString(id)
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return unicode.IsUpper(r)
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}
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