Created
August 1, 2017 10:09
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package myrange | |
import "fmt" | |
type RangeType int | |
const ( | |
OPEN RangeType = iota | |
CLOSE | |
OPEN_CLOSE | |
CLOSE_OPEN | |
) | |
type Range struct { | |
LowerEndpoint int | |
UpperEndpoint int | |
RangeType RangeType | |
} | |
func NewRange(lower int, upper int, rangeType RangeType) (*Range, error) { | |
if rangeType == CLOSE && lower > upper { | |
return nil, fmt.Errorf("rangeType == CLOSE && lower > upper") | |
} | |
if rangeType == OPEN && lower >= upper { | |
return nil, fmt.Errorf("rangeType == OPEN && lower >= upper") | |
} | |
return &Range{lower, upper, rangeType}, nil | |
} | |
func (r *Range) Include(in *Range) bool { | |
if r.LowerEndpoint <= in.LowerEndpoint && r.UpperEndpoint >= in.UpperEndpoint { | |
return true | |
} | |
return false | |
} |
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package myrange | |
import "testing" | |
var propertyTest = []struct { | |
lower int | |
upper int | |
rangeType RangeType | |
out *Range | |
}{ | |
{1, 2, OPEN, &Range{1, 2, OPEN}}, | |
{2, 2, OPEN, nil}, | |
{2, 1, OPEN, nil}, | |
{1, 2, CLOSE, &Range{1, 2, CLOSE}}, | |
{2, 2, CLOSE, &Range{2, 2, CLOSE}}, | |
{2, 1, CLOSE, nil}, | |
} | |
func TestNewRange(t *testing.T) { | |
for _, tt := range propertyTest { | |
r, _ := NewRange(tt.lower, tt.upper, tt.rangeType) | |
if tt.out == nil { | |
if r != nil { | |
t.Errorf("expect:%v result:%v", tt, r) | |
} | |
} else { | |
if *r != *tt.out { | |
t.Errorf("expect:%v result:%v", tt, r) | |
} | |
} | |
} | |
} | |
var includeTest = []struct { | |
in1 *Range | |
in2 *Range | |
out bool | |
}{ | |
{&Range{1, 10, CLOSE}, &Range{2, 9, CLOSE}, true}, | |
{&Range{1, 10, CLOSE}, &Range{1, 10, CLOSE}, true}, | |
{&Range{1, 10, CLOSE}, &Range{2, 11, CLOSE}, false}, | |
{&Range{1, 10, CLOSE}, &Range{0, 9, CLOSE}, false}, | |
} | |
func TestInclude(t *testing.T) { | |
for _, tt := range includeTest { | |
if tt.in1.Include(tt.in2) != tt.out { | |
t.Errorf("エラー") | |
} | |
} | |
} |
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