89 lines
2.3 KiB
Go
89 lines
2.3 KiB
Go
// Copyright 2012 Aaron Jacobs. All Rights Reserved.
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// Author: aaronjjacobs@gmail.com (Aaron Jacobs)
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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 oglematchers
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import (
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"bytes"
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"errors"
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"fmt"
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"reflect"
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)
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var byteSliceType reflect.Type = reflect.TypeOf([]byte{})
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// DeepEquals returns a matcher that matches based on 'deep equality', as
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// defined by the reflect package. This matcher requires that values have
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// identical types to x.
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func DeepEquals(x interface{}) Matcher {
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return &deepEqualsMatcher{x}
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}
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type deepEqualsMatcher struct {
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x interface{}
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}
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func (m *deepEqualsMatcher) Description() string {
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xDesc := fmt.Sprintf("%v", m.x)
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xValue := reflect.ValueOf(m.x)
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// Special case: fmt.Sprintf presents nil slices as "[]", but
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// reflect.DeepEqual makes a distinction between nil and empty slices. Make
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// this less confusing.
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if xValue.Kind() == reflect.Slice && xValue.IsNil() {
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xDesc = "<nil slice>"
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}
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return fmt.Sprintf("deep equals: %s", xDesc)
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}
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func (m *deepEqualsMatcher) Matches(c interface{}) error {
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// Make sure the types match.
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ct := reflect.TypeOf(c)
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xt := reflect.TypeOf(m.x)
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if ct != xt {
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return NewFatalError(fmt.Sprintf("which is of type %v", ct))
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}
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// Special case: handle byte slices more efficiently.
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cValue := reflect.ValueOf(c)
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xValue := reflect.ValueOf(m.x)
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if ct == byteSliceType && !cValue.IsNil() && !xValue.IsNil() {
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xBytes := m.x.([]byte)
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cBytes := c.([]byte)
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if bytes.Equal(cBytes, xBytes) {
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return nil
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}
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return errors.New("")
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}
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// Defer to the reflect package.
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if reflect.DeepEqual(m.x, c) {
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return nil
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}
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// Special case: if the comparison failed because c is the nil slice, given
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// an indication of this (since its value is printed as "[]").
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if cValue.Kind() == reflect.Slice && cValue.IsNil() {
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return errors.New("which is nil")
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}
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return errors.New("")
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}
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