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// 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 (
"errors"
"fmt"
"reflect"
"strings"
)
// AnyOf accepts a set of values S and returns a matcher that follows the
// algorithm below when considering a candidate c:
//
// 1. If there exists a value m in S such that m implements the Matcher
// interface and m matches c, return true.
//
// 2. Otherwise, if there exists a value v in S such that v does not implement
// the Matcher interface and the matcher Equals(v) matches c, return true.
//
// 3. Otherwise, if there is a value m in S such that m implements the Matcher
// interface and m returns a fatal error for c, return that fatal error.
//
// 4. Otherwise, return false.
//
// This is akin to a logical OR operation for matchers, with non-matchers x
// being treated as Equals(x).
func AnyOf(vals ...interface{}) Matcher {
// Get ahold of a type variable for the Matcher interface.
var dummy *Matcher
matcherType := reflect.TypeOf(dummy).Elem()
// Create a matcher for each value, or use the value itself if it's already a
// matcher.
wrapped := make([]Matcher, len(vals))
for i, v := range vals {
t := reflect.TypeOf(v)
if t != nil && t.Implements(matcherType) {
wrapped[i] = v.(Matcher)
} else {
wrapped[i] = Equals(v)
}
}
return &anyOfMatcher{wrapped}
}
type anyOfMatcher struct {
wrapped []Matcher
}
func (m *anyOfMatcher) Description() string {
wrappedDescs := make([]string, len(m.wrapped))
for i, matcher := range m.wrapped {
wrappedDescs[i] = matcher.Description()
}
return fmt.Sprintf("or(%s)", strings.Join(wrappedDescs, ", "))
}
func (m *anyOfMatcher) Matches(c interface{}) (err error) {
err = errors.New("")
// Try each matcher in turn.
for _, matcher := range m.wrapped {
wrappedErr := matcher.Matches(c)
// Return immediately if there's a match.
if wrappedErr == nil {
err = nil
return
}
// Note the fatal error, if any.
if _, isFatal := wrappedErr.(*FatalError); isFatal {
err = wrappedErr
}
}
return
}
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