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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"
)
// 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
}
type anyMatcher struct{}
func (anyMatcher) Matches(x interface{}) bool {
return true
}
func (anyMatcher) String() string {
return "is anything"
}
type eqMatcher struct {
x interface{}
}
func (e eqMatcher) Matches(x interface{}) bool {
return reflect.DeepEqual(e.x, x)
}
func (e eqMatcher) String() string {
return fmt.Sprintf("is equal to %v", 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 {
// TODO: Improve this if we add a NotString method to the Matcher interface.
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()
}
// Constructors
// 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} }
// 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
func AssignableToTypeOf(x interface{}) Matcher {
return assignableToTypeOfMatcher{reflect.TypeOf(x)}
}
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