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92 lines
2.5 KiB
Go
92 lines
2.5 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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"strings"
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)
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// Given a list of arguments M, ElementsAre returns a matcher that matches
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// arrays and slices A where all of the following hold:
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//
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// * A is the same length as M.
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//
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// * For each i < len(A) where M[i] is a matcher, A[i] matches M[i].
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//
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// * For each i < len(A) where M[i] is not a matcher, A[i] matches
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// Equals(M[i]).
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//
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func ElementsAre(M ...interface{}) Matcher {
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// Copy over matchers, or convert to Equals(x) for non-matcher x.
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subMatchers := make([]Matcher, len(M))
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for i, x := range M {
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if matcher, ok := x.(Matcher); ok {
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subMatchers[i] = matcher
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continue
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}
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subMatchers[i] = Equals(x)
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}
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return &elementsAreMatcher{subMatchers}
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}
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type elementsAreMatcher struct {
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subMatchers []Matcher
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}
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func (m *elementsAreMatcher) Description() string {
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subDescs := make([]string, len(m.subMatchers))
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for i, sm := range m.subMatchers {
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subDescs[i] = sm.Description()
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}
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return fmt.Sprintf("elements are: [%s]", strings.Join(subDescs, ", "))
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}
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func (m *elementsAreMatcher) Matches(candidates interface{}) error {
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// The candidate must be a slice or an array.
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v := reflect.ValueOf(candidates)
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if v.Kind() != reflect.Slice && v.Kind() != reflect.Array {
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return NewFatalError("which is not a slice or array")
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}
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// The length must be correct.
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if v.Len() != len(m.subMatchers) {
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return errors.New(fmt.Sprintf("which is of length %d", v.Len()))
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}
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// Check each element.
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for i, subMatcher := range m.subMatchers {
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c := v.Index(i)
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if matchErr := subMatcher.Matches(c.Interface()); matchErr != nil {
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// Return an errors indicating which element doesn't match. If the
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// matcher error was fatal, make this one fatal too.
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err := errors.New(fmt.Sprintf("whose element %d doesn't match", i))
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if _, isFatal := matchErr.(*FatalError); isFatal {
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err = NewFatalError(err.Error())
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}
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return err
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}
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}
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return nil
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}
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