text: package matchers
  
  import (
  	"fmt"
  	"strings"
  
  	"github.com/onsi/gomega/format"
  	"gopkg.in/yaml.v2"
  )
  
  type MatchYAMLMatcher struct {
  	YAMLToMatch      interface{}
  	firstFailurePath []interface{}
  }
  
  func (matcher *MatchYAMLMatcher) Match(actual interface{}) (success bool, err error) {
  	actualString, expectedString, err := matcher.toStrings(actual)
  	if err != nil {
  		return false, err
  	}
  
  	var aval interface{}
  	var eval interface{}
  
  	if err := yaml.Unmarshal([]byte(actualString), &aval); err != nil {
  		return false, fmt.Errorf("Actual '%s' should be valid YAML, but it is not.\nUnderlying error:%s", actualString, err)
  	}
  	if err := yaml.Unmarshal([]byte(expectedString), &eval); err != nil {
  		return false, fmt.Errorf("Expected '%s' should be valid YAML, but it is not.\nUnderlying error:%s", expectedString, err)
  	}
  
  	var equal bool
  	equal, matcher.firstFailurePath = deepEqual(aval, eval)
  	return equal, nil
  }
  
  func (matcher *MatchYAMLMatcher) FailureMessage(actual interface{}) (message string) {
  	actualString, expectedString, _ := matcher.toNormalisedStrings(actual)
  	return formattedMessage(format.Message(actualString, "to match YAML of", expectedString), matcher.firstFailurePath)
  }
  
  func (matcher *MatchYAMLMatcher) NegatedFailureMessage(actual interface{}) (message string) {
  	actualString, expectedString, _ := matcher.toNormalisedStrings(actual)
  	return formattedMessage(format.Message(actualString, "not to match YAML of", expectedString), matcher.firstFailurePath)
  }
  
  func (matcher *MatchYAMLMatcher) toNormalisedStrings(actual interface{}) (actualFormatted, expectedFormatted string, err error) {
  	actualString, expectedString, err := matcher.toStrings(actual)
  	return normalise(actualString), normalise(expectedString), err
  }
  
  func normalise(input string) string {
  	var val interface{}
  	err := yaml.Unmarshal([]byte(input), &val)
  	if err != nil {
  		panic(err) // unreachable since Match already calls Unmarshal
  	}
  	output, err := yaml.Marshal(val)
  	if err != nil {
  		panic(err) // untested section, unreachable since we Unmarshal above
  	}
  	return strings.TrimSpace(string(output))
  }
  
  func (matcher *MatchYAMLMatcher) toStrings(actual interface{}) (actualFormatted, expectedFormatted string, err error) {
  	actualString, ok := toString(actual)
  	if !ok {
  		return "", "", fmt.Errorf("MatchYAMLMatcher matcher requires a string, stringer, or []byte.  Got actual:\n%s", format.Object(actual, 1))
  	}
  	expectedString, ok := toString(matcher.YAMLToMatch)
  	if !ok {
  		return "", "", fmt.Errorf("MatchYAMLMatcher matcher requires a string, stringer, or []byte.  Got expected:\n%s", format.Object(matcher.YAMLToMatch, 1))
  	}
  
  	return actualString, expectedString, nil
  }
  