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99 lines
3 KiB
Go
99 lines
3 KiB
Go
// Copyright 2017 Google Inc. All Rights Reserved.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package testutil
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import (
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"fmt"
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"math"
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"reflect"
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"unicode"
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"unicode/utf8"
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"github.com/golang/protobuf/proto"
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"github.com/google/go-cmp/cmp"
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)
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var (
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alwaysEqual = cmp.Comparer(func(_, _ interface{}) bool { return true })
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defaultCmpOptions = []cmp.Option{
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// Use proto.Equal for protobufs
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cmp.Comparer(proto.Equal),
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// NaNs compare equal
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cmp.FilterValues(func(x, y float64) bool {
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return math.IsNaN(x) && math.IsNaN(y)
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}, alwaysEqual),
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cmp.FilterValues(func(x, y float32) bool {
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return math.IsNaN(float64(x)) && math.IsNaN(float64(y))
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}, alwaysEqual),
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}
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)
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// Equal tests two values for equality.
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func Equal(x, y interface{}, opts ...cmp.Option) bool {
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// Put default options at the end. Order doesn't matter.
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opts = append(opts[:len(opts):len(opts)], defaultCmpOptions...)
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return cmp.Equal(x, y, opts...)
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}
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// Diff reports the differences between two values.
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// Diff(x, y) == "" iff Equal(x, y).
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func Diff(x, y interface{}, opts ...cmp.Option) string {
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// Put default options at the end. Order doesn't matter.
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opts = append(opts[:len(opts):len(opts)], defaultCmpOptions...)
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return cmp.Diff(x, y, opts...)
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}
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// TODO(jba): remove the code below when cmpopts becomes available.
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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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