forked from mystiq/dex
73 lines
2.3 KiB
Go
73 lines
2.3 KiB
Go
|
package matchers
|
||
|
|
|
||
|
|
import (
|
||
|
|
"fmt"
|
||
|
|
"reflect"
|
||
|
|
|
||
|
|
"github.com/onsi/gomega/internal/oraclematcher"
|
||
|
|
"github.com/onsi/gomega/types"
|
||
|
|
)
|
||
|
|
|
||
|
|
type WithTransformMatcher struct {
|
||
|
|
// input
|
||
|
|
Transform interface{} // must be a function of one parameter that returns one value
|
||
|
|
Matcher types.GomegaMatcher
|
||
|
|
|
||
|
|
// cached value
|
||
|
|
transformArgType reflect.Type
|
||
|
|
|
||
|
|
// state
|
||
|
|
transformedValue interface{}
|
||
|
|
}
|
||
|
|
|
||
|
|
func NewWithTransformMatcher(transform interface{}, matcher types.GomegaMatcher) *WithTransformMatcher {
|
||
|
|
if transform == nil {
|
||
|
|
panic("transform function cannot be nil")
|
||
|
|
}
|
||
|
|
txType := reflect.TypeOf(transform)
|
||
|
|
if txType.NumIn() != 1 {
|
||
|
|
panic("transform function must have 1 argument")
|
||
|
|
}
|
||
|
|
if txType.NumOut() != 1 {
|
||
|
|
panic("transform function must have 1 return value")
|
||
|
|
}
|
||
|
|
|
||
|
|
return &WithTransformMatcher{
|
||
|
|
Transform: transform,
|
||
|
|
Matcher: matcher,
|
||
|
|
transformArgType: reflect.TypeOf(transform).In(0),
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
func (m *WithTransformMatcher) Match(actual interface{}) (bool, error) {
|
||
|
|
// return error if actual's type is incompatible with Transform function's argument type
|
||
|
|
actualType := reflect.TypeOf(actual)
|
||
|
|
if !actualType.AssignableTo(m.transformArgType) {
|
||
|
|
return false, fmt.Errorf("Transform function expects '%s' but we have '%s'", m.transformArgType, actualType)
|
||
|
|
}
|
||
|
|
|
||
|
|
// call the Transform function with `actual`
|
||
|
|
fn := reflect.ValueOf(m.Transform)
|
||
|
|
result := fn.Call([]reflect.Value{reflect.ValueOf(actual)})
|
||
|
|
m.transformedValue = result[0].Interface() // expect exactly one value
|
||
|
|
|
||
|
|
return m.Matcher.Match(m.transformedValue)
|
||
|
|
}
|
||
|
|
|
||
|
|
func (m *WithTransformMatcher) FailureMessage(_ interface{}) (message string) {
|
||
|
|
return m.Matcher.FailureMessage(m.transformedValue)
|
||
|
|
}
|
||
|
|
|
||
|
|
func (m *WithTransformMatcher) NegatedFailureMessage(_ interface{}) (message string) {
|
||
|
|
return m.Matcher.NegatedFailureMessage(m.transformedValue)
|
||
|
|
}
|
||
|
|
|
||
|
|
func (m *WithTransformMatcher) MatchMayChangeInTheFuture(_ interface{}) bool {
|
||
|
|
// TODO: Maybe this should always just return true? (Only an issue for non-deterministic transformers.)
|
||
|
|
//
|
||
|
|
// Querying the next matcher is fine if the transformer always will return the same value.
|
||
|
|
// But if the transformer is non-deterministic and returns a different value each time, then there
|
||
|
|
// is no point in querying the next matcher, since it can only comment on the last transformed value.
|
||
|
|
return oraclematcher.MatchMayChangeInTheFuture(m.Matcher, m.transformedValue)
|
||
|
|
}
|