/
comparator.go
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/
comparator.go
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// Copyright 2017-2020 Authors of Cilium
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package comparator
import (
"github.com/kr/pretty"
"github.com/pmezard/go-difflib/difflib"
)
// Compare compares two interfaces and emits a unified diff as string
func Compare(a, b interface{}) string {
return CompareWithNames(a, b, "a", "b")
}
// CompareWithNames compares two interfaces and emits a unified diff as string
func CompareWithNames(a, b interface{}, nameA, nameB string) string {
stringA := pretty.Sprintf("%# v", a)
stringB := pretty.Sprintf("%# v", b)
diff := difflib.UnifiedDiff{
A: difflib.SplitLines(stringA),
B: difflib.SplitLines(stringB),
FromFile: nameA,
ToFile: nameB,
Context: 32,
}
out, err := difflib.GetUnifiedDiffString(diff)
if err != nil {
return err.Error()
}
return "Unified diff:\n" + out
}
// MapStringEquals returns true if both maps are equal.
func MapStringEquals(m1, m2 map[string]string) bool {
switch {
case m1 == nil && m2 == nil:
return true
case m1 == nil && m2 != nil,
m1 != nil && m2 == nil,
len(m1) != len(m2):
return false
}
for k1, v1 := range m1 {
if v2, ok := m2[k1]; !ok || v2 != v1 {
return false
}
}
return true
}
// MapBoolEquals returns true if both maps are equal.
func MapBoolEquals(m1, m2 map[string]bool) bool {
switch {
case m1 == nil && m2 == nil:
return true
case m1 == nil && m2 != nil,
m1 != nil && m2 == nil,
len(m1) != len(m2):
return false
}
for k1, v1 := range m1 {
if v2, ok := m2[k1]; !ok || v2 != v1 {
return false
}
}
return true
}
// MapStringEqualsIgnoreKeys returns true if both maps have the same values for
// the keys that are not present in the 'ignoreKeys'.
func MapStringEqualsIgnoreKeys(m1, m2 map[string]string, ignoreKeys []string) bool {
switch {
case m1 == nil && m2 == nil:
return true
case m1 == nil && m2 != nil,
m1 != nil && m2 == nil:
return false
}
ignoredM1 := 0
for k1, v1 := range m1 {
var ignore bool
for _, ig := range ignoreKeys {
if k1 == ig {
ignore = true
break
}
}
if ignore {
ignoredM1++
continue
}
if v2, ok := m2[k1]; !ok || v2 != v1 {
return false
}
}
ignoredM2 := 0
for _, ig := range ignoreKeys {
if _, ok := m2[ig]; ok {
ignoredM2++
}
}
if len(m1)-ignoredM1 != len(m2)-ignoredM2 {
return false
}
return true
}