146 lines
4.1 KiB
Go
146 lines
4.1 KiB
Go
package gstruct
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import (
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"errors"
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"fmt"
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"reflect"
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"runtime/debug"
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"github.com/onsi/gomega/format"
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errorsutil "github.com/onsi/gomega/gstruct/errors"
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"github.com/onsi/gomega/types"
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)
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//MatchAllElements succeeds if every element of a slice matches the element matcher it maps to
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//through the id function, and every element matcher is matched.
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// Expect([]string{"a", "b"}).To(MatchAllElements(idFn, matchers.Elements{
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// "a": BeEqual("a"),
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// "b": BeEqual("b"),
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// })
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func MatchAllElements(identifier Identifier, elements Elements) types.GomegaMatcher {
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return &ElementsMatcher{
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Identifier: identifier,
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Elements: elements,
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}
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}
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//MatchElements succeeds if each element of a slice matches the element matcher it maps to
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//through the id function. It can ignore extra elements and/or missing elements.
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// Expect([]string{"a", "c"}).To(MatchElements(idFn, IgnoreMissing|IgnoreExtra, matchers.Elements{
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// "a": BeEqual("a")
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// "b": BeEqual("b"),
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// })
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func MatchElements(identifier Identifier, options Options, elements Elements) types.GomegaMatcher {
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return &ElementsMatcher{
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Identifier: identifier,
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Elements: elements,
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IgnoreExtras: options&IgnoreExtras != 0,
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IgnoreMissing: options&IgnoreMissing != 0,
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AllowDuplicates: options&AllowDuplicates != 0,
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}
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}
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// ElementsMatcher is a NestingMatcher that applies custom matchers to each element of a slice mapped
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// by the Identifier function.
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// TODO: Extend this to work with arrays & maps (map the key) as well.
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type ElementsMatcher struct {
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// Matchers for each element.
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Elements Elements
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// Function mapping an element to the string key identifying its matcher.
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Identifier Identifier
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// Whether to ignore extra elements or consider it an error.
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IgnoreExtras bool
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// Whether to ignore missing elements or consider it an error.
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IgnoreMissing bool
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// Whether to key duplicates when matching IDs.
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AllowDuplicates bool
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// State.
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failures []error
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}
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// Element ID to matcher.
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type Elements map[string]types.GomegaMatcher
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// Function for identifying (mapping) elements.
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type Identifier func(element interface{}) string
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func (m *ElementsMatcher) Match(actual interface{}) (success bool, err error) {
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if reflect.TypeOf(actual).Kind() != reflect.Slice {
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return false, fmt.Errorf("%v is type %T, expected slice", actual, actual)
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}
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m.failures = m.matchElements(actual)
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if len(m.failures) > 0 {
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return false, nil
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}
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return true, nil
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}
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func (m *ElementsMatcher) matchElements(actual interface{}) (errs []error) {
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// Provide more useful error messages in the case of a panic.
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defer func() {
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if err := recover(); err != nil {
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errs = append(errs, fmt.Errorf("panic checking %+v: %v\n%s", actual, err, debug.Stack()))
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}
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}()
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val := reflect.ValueOf(actual)
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elements := map[string]bool{}
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for i := 0; i < val.Len(); i++ {
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element := val.Index(i).Interface()
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id := m.Identifier(element)
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if elements[id] {
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if !m.AllowDuplicates {
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errs = append(errs, fmt.Errorf("found duplicate element ID %s", id))
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continue
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}
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}
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elements[id] = true
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matcher, expected := m.Elements[id]
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if !expected {
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if !m.IgnoreExtras {
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errs = append(errs, fmt.Errorf("unexpected element %s", id))
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}
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continue
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}
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match, err := matcher.Match(element)
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if match {
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continue
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}
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if err == nil {
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if nesting, ok := matcher.(errorsutil.NestingMatcher); ok {
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err = errorsutil.AggregateError(nesting.Failures())
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} else {
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err = errors.New(matcher.FailureMessage(element))
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}
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}
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errs = append(errs, errorsutil.Nest(fmt.Sprintf("[%s]", id), err))
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}
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for id := range m.Elements {
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if !elements[id] && !m.IgnoreMissing {
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errs = append(errs, fmt.Errorf("missing expected element %s", id))
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}
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}
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return errs
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}
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func (m *ElementsMatcher) FailureMessage(actual interface{}) (message string) {
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failure := errorsutil.AggregateError(m.failures)
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return format.Message(actual, fmt.Sprintf("to match elements: %v", failure))
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}
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func (m *ElementsMatcher) NegatedFailureMessage(actual interface{}) (message string) {
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return format.Message(actual, "not to match elements")
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}
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func (m *ElementsMatcher) Failures() []error {
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return m.failures
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}
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