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// Copyright 2012 Aaron Jacobs. All Rights Reserved.
// Author: aaronjjacobs@gmail.com (Aaron Jacobs)
//
// 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 oglematchers
import (
"errors"
"fmt"
"reflect"
)
// Return a matcher that matches non-nil pointers whose pointee matches the
// wrapped matcher.
func Pointee(m Matcher) Matcher {
return &pointeeMatcher{m}
}
type pointeeMatcher struct {
wrapped Matcher
}
func (m *pointeeMatcher) Matches(c interface{}) (err error) {
// Make sure the candidate is of the appropriate type.
cv := reflect.ValueOf(c)
if !cv.IsValid() || cv.Kind() != reflect.Ptr {
return NewFatalError("which is not a pointer")
}
// Make sure the candidate is non-nil.
if cv.IsNil() {
return NewFatalError("")
}
// Defer to the wrapped matcher. Fix up empty errors so that failure messages
// are more helpful than just printing a pointer for "Actual".
pointee := cv.Elem().Interface()
err = m.wrapped.Matches(pointee)
if err != nil && err.Error() == "" {
s := fmt.Sprintf("whose pointee is %v", pointee)
if _, ok := err.(*FatalError); ok {
err = NewFatalError(s)
} else {
err = errors.New(s)
}
}
return err
}
func (m *pointeeMatcher) Description() string {
return fmt.Sprintf("pointee(%s)", m.wrapped.Description())
}
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