65 lines
1.8 KiB
Go
65 lines
1.8 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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"errors"
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"fmt"
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"reflect"
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)
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// Return a matcher that matches non-nil pointers whose pointee matches the
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// wrapped matcher.
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func Pointee(m Matcher) Matcher {
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return &pointeeMatcher{m}
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}
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type pointeeMatcher struct {
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wrapped Matcher
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}
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func (m *pointeeMatcher) Matches(c interface{}) (err error) {
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// Make sure the candidate is of the appropriate type.
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cv := reflect.ValueOf(c)
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if !cv.IsValid() || cv.Kind() != reflect.Ptr {
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return NewFatalError("which is not a pointer")
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}
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// Make sure the candidate is non-nil.
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if cv.IsNil() {
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return NewFatalError("")
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}
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// Defer to the wrapped matcher. Fix up empty errors so that failure messages
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// are more helpful than just printing a pointer for "Actual".
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pointee := cv.Elem().Interface()
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err = m.wrapped.Matches(pointee)
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if err != nil && err.Error() == "" {
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s := fmt.Sprintf("whose pointee is %v", pointee)
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if _, ok := err.(*FatalError); ok {
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err = NewFatalError(s)
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} else {
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err = errors.New(s)
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}
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}
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return err
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}
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func (m *pointeeMatcher) Description() string {
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return fmt.Sprintf("pointee(%s)", m.wrapped.Description())
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}
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