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// Copyright 2010 Google Inc.
//
// 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 gomock
import (
"fmt"
"reflect"
"strings"
)
// A Matcher is a representation of a class of values.
// It is used to represent the valid or expected arguments to a mocked method.
type Matcher interface {
// Matches returns whether x is a match.
Matches(x interface{}) bool
// String describes what the matcher matches.
String() string
}
// WantFormatter modifies the given Matcher's String() method to the given
// Stringer. This allows for control on how the "Want" is formatted when
// printing .
func WantFormatter(s fmt.Stringer, m Matcher) Matcher {
type matcher interface {
Matches(x interface{}) bool
}
return struct {
matcher
fmt.Stringer
}{
matcher: m,
Stringer: s,
}
}
// StringerFunc type is an adapter to allow the use of ordinary functions as
// a Stringer. If f is a function with the appropriate signature,
// StringerFunc(f) is a Stringer that calls f.
type StringerFunc func() string
// String implements fmt.Stringer.
func (f StringerFunc) String() string {
return f()
}
// GotFormatter is used to better print failure messages. If a matcher
// implements GotFormatter, it will use the result from Got when printing
// the failure message.
type GotFormatter interface {
// Got is invoked with the received value. The result is used when
// printing the failure message.
Got(got interface{}) string
}
// GotFormatterFunc type is an adapter to allow the use of ordinary
// functions as a GotFormatter. If f is a function with the appropriate
// signature, GotFormatterFunc(f) is a GotFormatter that calls f.
type GotFormatterFunc func(got interface{}) string
// Got implements GotFormatter.
func (f GotFormatterFunc) Got(got interface{}) string {
return f(got)
}
// GotFormatterAdapter attaches a GotFormatter to a Matcher.
func GotFormatterAdapter(s GotFormatter, m Matcher) Matcher {
return struct {
GotFormatter
Matcher
}{
GotFormatter: s,
Matcher: m,
}
}
type anyMatcher struct{}
func (anyMatcher) Matches(interface{}) bool {
return true
}
func (anyMatcher) String() string {
return "is anything"
}
type eqMatcher struct {
x interface{}
}
func (e eqMatcher) Matches(x interface{}) bool {
// In case, some value is nil
if e.x == nil || x == nil {
return reflect.DeepEqual(e.x, x)
}
// Check if types assignable and convert them to common type
x1Val := reflect.ValueOf(e.x)
x2Val := reflect.ValueOf(x)
if x1Val.Type().AssignableTo(x2Val.Type()) {
x1ValConverted := x1Val.Convert(x2Val.Type())
return reflect.DeepEqual(x1ValConverted.Interface(), x2Val.Interface())
}
return false
}
func (e eqMatcher) String() string {
return fmt.Sprintf("is equal to %v (%T)", e.x, e.x)
}
type nilMatcher struct{}
func (nilMatcher) Matches(x interface{}) bool {
if x == nil {
return true
}
v := reflect.ValueOf(x)
switch v.Kind() {
case reflect.Chan, reflect.Func, reflect.Interface, reflect.Map,
reflect.Ptr, reflect.Slice:
return v.IsNil()
}
return false
}
func (nilMatcher) String() string {
return "is nil"
}
type notMatcher struct {
m Matcher
}
func (n notMatcher) Matches(x interface{}) bool {
return !n.m.Matches(x)
}
func (n notMatcher) String() string {
return "not(" + n.m.String() + ")"
}
type assignableToTypeOfMatcher struct {
targetType reflect.Type
}
func (m assignableToTypeOfMatcher) Matches(x interface{}) bool {
return reflect.TypeOf(x).AssignableTo(m.targetType)
}
func (m assignableToTypeOfMatcher) String() string {
return "is assignable to " + m.targetType.Name()
}
type allMatcher struct {
matchers []Matcher
}
func (am allMatcher) Matches(x interface{}) bool {
for _, m := range am.matchers {
if !m.Matches(x) {
return false
}
}
return true
}
func (am allMatcher) String() string {
ss := make([]string, 0, len(am.matchers))
for _, matcher := range am.matchers {
ss = append(ss, matcher.String())
}
return strings.Join(ss, "; ")
}
type lenMatcher struct {
i int
}
func (m lenMatcher) Matches(x interface{}) bool {
v := reflect.ValueOf(x)
switch v.Kind() {
case reflect.Array, reflect.Chan, reflect.Map, reflect.Slice, reflect.String:
return v.Len() == m.i
default:
return false
}
}
func (m lenMatcher) String() string {
return fmt.Sprintf("has length %d", m.i)
}
type inAnyOrderMatcher struct {
x interface{}
}
func (m inAnyOrderMatcher) Matches(x interface{}) bool {
given, ok := m.prepareValue(x)
if !ok {
return false
}
wanted, ok := m.prepareValue(m.x)
if !ok {
return false
}
if given.Len() != wanted.Len() {
return false
}
usedFromGiven := make([]bool, given.Len())
foundFromWanted := make([]bool, wanted.Len())
for i := 0; i < wanted.Len(); i++ {
wantedMatcher := Eq(wanted.Index(i).Interface())
for j := 0; j < given.Len(); j++ {
if usedFromGiven[j] {
continue
}
if wantedMatcher.Matches(given.Index(j).Interface()) {
foundFromWanted[i] = true
usedFromGiven[j] = true
break
}
}
}
missingFromWanted := 0
for _, found := range foundFromWanted {
if !found {
missingFromWanted++
}
}
extraInGiven := 0
for _, used := range usedFromGiven {
if !used {
extraInGiven++
}
}
return extraInGiven == 0 && missingFromWanted == 0
}
func (m inAnyOrderMatcher) prepareValue(x interface{}) (reflect.Value, bool) {
xValue := reflect.ValueOf(x)
switch xValue.Kind() {
case reflect.Slice, reflect.Array:
return xValue, true
default:
return reflect.Value{}, false
}
}
func (m inAnyOrderMatcher) String() string {
return fmt.Sprintf("has the same elements as %v", m.x)
}
// Constructors
// All returns a composite Matcher that returns true if and only all of the
// matchers return true.
func All(ms ...Matcher) Matcher { return allMatcher{ms} }
// Any returns a matcher that always matches.
func Any() Matcher { return anyMatcher{} }
// Eq returns a matcher that matches on equality.
//
// Example usage:
// Eq(5).Matches(5) // returns true
// Eq(5).Matches(4) // returns false
func Eq(x interface{}) Matcher { return eqMatcher{x} }
// Len returns a matcher that matches on length. This matcher returns false if
// is compared to a type that is not an array, chan, map, slice, or string.
func Len(i int) Matcher {
return lenMatcher{i}
}
// Nil returns a matcher that matches if the received value is nil.
//
// Example usage:
// var x *bytes.Buffer
// Nil().Matches(x) // returns true
// x = &bytes.Buffer{}
// Nil().Matches(x) // returns false
func Nil() Matcher { return nilMatcher{} }
// Not reverses the results of its given child matcher.
//
// Example usage:
// Not(Eq(5)).Matches(4) // returns true
// Not(Eq(5)).Matches(5) // returns false
func Not(x interface{}) Matcher {
if m, ok := x.(Matcher); ok {
return notMatcher{m}
}
return notMatcher{Eq(x)}
}
// AssignableToTypeOf is a Matcher that matches if the parameter to the mock
// function is assignable to the type of the parameter to this function.
//
// Example usage:
// var s fmt.Stringer = &bytes.Buffer{}
// AssignableToTypeOf(s).Matches(time.Second) // returns true
// AssignableToTypeOf(s).Matches(99) // returns false
//
// var ctx = reflect.TypeOf((*context.Context)(nil)).Elem()
// AssignableToTypeOf(ctx).Matches(context.Background()) // returns true
func AssignableToTypeOf(x interface{}) Matcher {
if xt, ok := x.(reflect.Type); ok {
return assignableToTypeOfMatcher{xt}
}
return assignableToTypeOfMatcher{reflect.TypeOf(x)}
}
// InAnyOrder is a Matcher that returns true for collections of the same elements ignoring the order.
//
// Example usage:
// InAnyOrder([]int{1, 2, 3}).Matches([]int{1, 3, 2}) // returns true
// InAnyOrder([]int{1, 2, 3}).Matches([]int{1, 2}) // returns false
func InAnyOrder(x interface{}) Matcher {
return inAnyOrderMatcher{x}
}
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