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package matchers
import (
"fmt"
"reflect"
"strings"
"github.com/onsi/gomega/format"
)
// missingFieldError represents a missing field extraction error that
// HaveExistingFieldMatcher can ignore, as opposed to other, sever field
// extraction errors, such as nil pointers, et cetera.
type missingFieldError string
func (e missingFieldError) Error() string {
return string(e)
}
func extractField(actual interface{}, field string, matchername string) (interface{}, error) {
fields := strings.SplitN(field, ".", 2)
actualValue := reflect.ValueOf(actual)
if actualValue.Kind() == reflect.Ptr {
actualValue = actualValue.Elem()
}
if actualValue == (reflect.Value{}) {
return nil, fmt.Errorf("%s encountered nil while dereferencing a pointer of type %T.", matchername, actual)
}
if actualValue.Kind() != reflect.Struct {
return nil, fmt.Errorf("%s encountered:\n%s\nWhich is not a struct.", matchername, format.Object(actual, 1))
}
var extractedValue reflect.Value
if strings.HasSuffix(fields[0], "()") {
extractedValue = actualValue.MethodByName(strings.TrimSuffix(fields[0], "()"))
if extractedValue == (reflect.Value{}) && actualValue.CanAddr() {
extractedValue = actualValue.Addr().MethodByName(strings.TrimSuffix(fields[0], "()"))
}
if extractedValue == (reflect.Value{}) {
return nil, missingFieldError(fmt.Sprintf("%s could not find method named '%s' in struct of type %T.", matchername, fields[0], actual))
}
t := extractedValue.Type()
if t.NumIn() != 0 || t.NumOut() != 1 {
return nil, fmt.Errorf("%s found an invalid method named '%s' in struct of type %T.\nMethods must take no arguments and return exactly one value.", matchername, fields[0], actual)
}
extractedValue = extractedValue.Call([]reflect.Value{})[0]
} else {
extractedValue = actualValue.FieldByName(fields[0])
if extractedValue == (reflect.Value{}) {
return nil, missingFieldError(fmt.Sprintf("%s could not find field named '%s' in struct:\n%s", matchername, fields[0], format.Object(actual, 1)))
}
}
if len(fields) == 1 {
return extractedValue.Interface(), nil
} else {
return extractField(extractedValue.Interface(), fields[1], matchername)
}
}
type HaveFieldMatcher struct {
Field string
Expected interface{}
extractedField interface{}
expectedMatcher omegaMatcher
}
func (matcher *HaveFieldMatcher) Match(actual interface{}) (success bool, err error) {
matcher.extractedField, err = extractField(actual, matcher.Field, "HaveField")
if err != nil {
return false, err
}
var isMatcher bool
matcher.expectedMatcher, isMatcher = matcher.Expected.(omegaMatcher)
if !isMatcher {
matcher.expectedMatcher = &EqualMatcher{Expected: matcher.Expected}
}
return matcher.expectedMatcher.Match(matcher.extractedField)
}
func (matcher *HaveFieldMatcher) FailureMessage(actual interface{}) (message string) {
message = fmt.Sprintf("Value for field '%s' failed to satisfy matcher.\n", matcher.Field)
message += matcher.expectedMatcher.FailureMessage(matcher.extractedField)
return message
}
func (matcher *HaveFieldMatcher) NegatedFailureMessage(actual interface{}) (message string) {
message = fmt.Sprintf("Value for field '%s' satisfied matcher, but should not have.\n", matcher.Field)
message += matcher.expectedMatcher.NegatedFailureMessage(matcher.extractedField)
return message
}
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