githaven/vendor/github.com/smartystreets/assertions/internal/oglematchers/all_of.go

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2016-11-03 22:16:01 +00:00
// Copyright 2011 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 (
"strings"
)
// AllOf accepts a set of matchers S and returns a matcher that follows the
// algorithm below when considering a candidate c:
//
// 1. Return true if for every Matcher m in S, m matches c.
//
// 2. Otherwise, if there is a matcher m in S such that m returns a fatal
// error for c, return that matcher's error message.
//
// 3. Otherwise, return false with the error from some wrapped matcher.
//
// This is akin to a logical AND operation for matchers.
func AllOf(matchers ...Matcher) Matcher {
return &allOfMatcher{matchers}
}
type allOfMatcher struct {
wrappedMatchers []Matcher
}
func (m *allOfMatcher) Description() string {
// Special case: the empty set.
if len(m.wrappedMatchers) == 0 {
return "is anything"
}
// Join the descriptions for the wrapped matchers.
wrappedDescs := make([]string, len(m.wrappedMatchers))
for i, wrappedMatcher := range m.wrappedMatchers {
wrappedDescs[i] = wrappedMatcher.Description()
}
return strings.Join(wrappedDescs, ", and ")
}
func (m *allOfMatcher) Matches(c interface{}) (err error) {
for _, wrappedMatcher := range m.wrappedMatchers {
if wrappedErr := wrappedMatcher.Matches(c); wrappedErr != nil {
err = wrappedErr
// If the error is fatal, return immediately with this error.
_, ok := wrappedErr.(*FatalError)
if ok {
return
}
}
}
return
}