keys.go

Documentation: github.com/onsi/gomega/gstruct

     1  // untested sections: 6
     2  
     3  package gstruct
     4  
     5  import (
     6  	"errors"
     7  	"fmt"
     8  	"reflect"
     9  	"runtime/debug"
    10  	"strings"
    11  
    12  	"github.com/onsi/gomega/format"
    13  	errorsutil "github.com/onsi/gomega/gstruct/errors"
    14  	"github.com/onsi/gomega/types"
    15  )
    16  
    17  func MatchAllKeys(keys Keys) types.GomegaMatcher {
    18  	return &KeysMatcher{
    19  		Keys: keys,
    20  	}
    21  }
    22  
    23  func MatchKeys(options Options, keys Keys) types.GomegaMatcher {
    24  	return &KeysMatcher{
    25  		Keys:          keys,
    26  		IgnoreExtras:  options&IgnoreExtras != 0,
    27  		IgnoreMissing: options&IgnoreMissing != 0,
    28  	}
    29  }
    30  
    31  type KeysMatcher struct {
    32  	// Matchers for each key.
    33  	Keys Keys
    34  
    35  	// Whether to ignore extra keys or consider it an error.
    36  	IgnoreExtras bool
    37  	// Whether to ignore missing keys or consider it an error.
    38  	IgnoreMissing bool
    39  
    40  	// State.
    41  	failures []error
    42  }
    43  
    44  type Keys map[interface{}]types.GomegaMatcher
    45  
    46  func (m *KeysMatcher) Match(actual interface{}) (success bool, err error) {
    47  	if reflect.TypeOf(actual).Kind() != reflect.Map {
    48  		return false, fmt.Errorf("%v is type %T, expected map", actual, actual)
    49  	}
    50  
    51  	m.failures = m.matchKeys(actual)
    52  	if len(m.failures) > 0 {
    53  		return false, nil
    54  	}
    55  	return true, nil
    56  }
    57  
    58  func (m *KeysMatcher) matchKeys(actual interface{}) (errs []error) {
    59  	actualValue := reflect.ValueOf(actual)
    60  	keys := map[interface{}]bool{}
    61  	for _, keyValue := range actualValue.MapKeys() {
    62  		key := keyValue.Interface()
    63  		keys[key] = true
    64  
    65  		err := func() (err error) {
    66  			// This test relies heavily on reflect, which tends to panic.
    67  			// Recover here to provide more useful error messages in that case.
    68  			defer func() {
    69  				if r := recover(); r != nil {
    70  					err = fmt.Errorf("panic checking %+v: %v\n%s", actual, r, debug.Stack())
    71  				}
    72  			}()
    73  
    74  			matcher, ok := m.Keys[key]
    75  			if !ok {
    76  				if !m.IgnoreExtras {
    77  					return fmt.Errorf("unexpected key %s: %+v", key, actual)
    78  				}
    79  				return nil
    80  			}
    81  
    82  			valInterface := actualValue.MapIndex(keyValue).Interface()
    83  
    84  			match, err := matcher.Match(valInterface)
    85  			if err != nil {
    86  				return err
    87  			}
    88  
    89  			if !match {
    90  				if nesting, ok := matcher.(errorsutil.NestingMatcher); ok {
    91  					return errorsutil.AggregateError(nesting.Failures())
    92  				}
    93  				return errors.New(matcher.FailureMessage(valInterface))
    94  			}
    95  			return nil
    96  		}()
    97  		if err != nil {
    98  			errs = append(errs, errorsutil.Nest(fmt.Sprintf(".%#v", key), err))
    99  		}
   100  	}
   101  
   102  	for key := range m.Keys {
   103  		if !keys[key] && !m.IgnoreMissing {
   104  			errs = append(errs, fmt.Errorf("missing expected key %s", key))
   105  		}
   106  	}
   107  
   108  	return errs
   109  }
   110  
   111  func (m *KeysMatcher) FailureMessage(actual interface{}) (message string) {
   112  	failures := make([]string, len(m.failures))
   113  	for i := range m.failures {
   114  		failures[i] = m.failures[i].Error()
   115  	}
   116  	return format.Message(reflect.TypeOf(actual).Name(),
   117  		fmt.Sprintf("to match keys: {\n%v\n}\n", strings.Join(failures, "\n")))
   118  }
   119  
   120  func (m *KeysMatcher) NegatedFailureMessage(actual interface{}) (message string) {
   121  	return format.Message(actual, "not to match keys")
   122  }
   123  
   124  func (m *KeysMatcher) Failures() []error {
   125  	return m.failures
   126  }
   127
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