package matchers import ( "fmt" "math" "github.com/onsi/gomega/format" ) type BeNumericallyMatcher struct { Comparator string CompareTo []interface{} } func (matcher *BeNumericallyMatcher) FailureMessage(actual interface{}) (message string) { return matcher.FormatFailureMessage(actual, false) } func (matcher *BeNumericallyMatcher) NegatedFailureMessage(actual interface{}) (message string) { return matcher.FormatFailureMessage(actual, true) } func (matcher *BeNumericallyMatcher) FormatFailureMessage(actual interface{}, negated bool) (message string) { if len(matcher.CompareTo) == 1 { message = fmt.Sprintf("to be %s", matcher.Comparator) } else { message = fmt.Sprintf("to be within %v of %s", matcher.CompareTo[1], matcher.Comparator) } if negated { message = "not " + message } return format.Message(actual, message, matcher.CompareTo[0]) } func (matcher *BeNumericallyMatcher) Match(actual interface{}) (success bool, err error) { if len(matcher.CompareTo) == 0 || len(matcher.CompareTo) > 2 { return false, fmt.Errorf("BeNumerically requires 1 or 2 CompareTo arguments. Got:\n%s", format.Object(matcher.CompareTo, 1)) } if !isNumber(actual) { return false, fmt.Errorf("Expected a number. Got:\n%s", format.Object(actual, 1)) } if !isNumber(matcher.CompareTo[0]) { return false, fmt.Errorf("Expected a number. Got:\n%s", format.Object(matcher.CompareTo[0], 1)) } if len(matcher.CompareTo) == 2 && !isNumber(matcher.CompareTo[1]) { return false, fmt.Errorf("Expected a number. Got:\n%s", format.Object(matcher.CompareTo[0], 1)) } switch matcher.Comparator { case "==", "~", ">", ">=", "<", "<=": default: return false, fmt.Errorf("Unknown comparator: %s", matcher.Comparator) } if isFloat(actual) || isFloat(matcher.CompareTo[0]) { var secondOperand float64 = 1e-8 if len(matcher.CompareTo) == 2 { secondOperand = toFloat(matcher.CompareTo[1]) } success = matcher.matchFloats(toFloat(actual), toFloat(matcher.CompareTo[0]), secondOperand) } else if isInteger(actual) { var secondOperand int64 = 0 if len(matcher.CompareTo) == 2 { secondOperand = toInteger(matcher.CompareTo[1]) } success = matcher.matchIntegers(toInteger(actual), toInteger(matcher.CompareTo[0]), secondOperand) } else if isUnsignedInteger(actual) { var secondOperand uint64 = 0 if len(matcher.CompareTo) == 2 { secondOperand = toUnsignedInteger(matcher.CompareTo[1]) } success = matcher.matchUnsignedIntegers(toUnsignedInteger(actual), toUnsignedInteger(matcher.CompareTo[0]), secondOperand) } else { return false, fmt.Errorf("Failed to compare:\n%s\n%s:\n%s", format.Object(actual, 1), matcher.Comparator, format.Object(matcher.CompareTo[0], 1)) } return success, nil } func (matcher *BeNumericallyMatcher) matchIntegers(actual, compareTo, threshold int64) (success bool) { switch matcher.Comparator { case "==", "~": diff := actual - compareTo return -threshold <= diff && diff <= threshold case ">": return (actual > compareTo) case ">=": return (actual >= compareTo) case "<": return (actual < compareTo) case "<=": return (actual <= compareTo) } return false } func (matcher *BeNumericallyMatcher) matchUnsignedIntegers(actual, compareTo, threshold uint64) (success bool) { switch matcher.Comparator { case "==", "~": if actual < compareTo { actual, compareTo = compareTo, actual } return actual-compareTo <= threshold case ">": return (actual > compareTo) case ">=": return (actual >= compareTo) case "<": return (actual < compareTo) case "<=": return (actual <= compareTo) } return false } func (matcher *BeNumericallyMatcher) matchFloats(actual, compareTo, threshold float64) (success bool) { switch matcher.Comparator { case "~": return math.Abs(actual-compareTo) <= threshold case "==": return (actual == compareTo) case ">": return (actual > compareTo) case ">=": return (actual >= compareTo) case "<": return (actual < compareTo) case "<=": return (actual <= compareTo) } return false }