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duration.go
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duration.go
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// Copyright 2023 Sneller, Inc.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package date
import (
"fmt"
"strings"
)
// A Duration represents a calendar duration
// with year, month, and day components. This is
// intended to be used to represent expiration
// times on a granularity of days. Use
// time.Duration to represent durations smaller
// than one day.
type Duration struct {
Year, Month, Day int
}
// ParseDuration parses a duration string.
func ParseDuration(s string) (Duration, bool) {
y, m, d, ok := parseDuration([]byte(s))
if !ok || y == 0 && m == 0 && d == 0 {
return Duration{}, false
}
return Duration{y, m, d}, true
}
// Add adds d to t.
func (d Duration) Add(t Time) Time {
year := t.Year() + d.Year
month := t.Month() + d.Month
day := t.Day() + d.Day
hour := t.Hour()
min := t.Minute()
sec := t.Second()
ns := t.Nanosecond()
return Date(year, month, day, hour, min, sec, ns)
}
// Sub subtracts d from t.
func (d Duration) Sub(t Time) Time {
year := t.Year() - d.Year
month := t.Month() - d.Month
day := t.Day() - d.Day
hour := t.Hour()
min := t.Minute()
sec := t.Second()
ns := t.Nanosecond()
return Date(year, month, day, hour, min, sec, ns)
}
// Zero returns whether d is equal to the zero
// value of a Duration.
func (d Duration) Zero() bool {
return d == Duration{}
}
// String implements io.Stringer
func (d Duration) String() string {
var sb strings.Builder
if d.Year != 0 {
fmt.Fprintf(&sb, "%dy", d.Year)
}
if d.Month != 0 {
fmt.Fprintf(&sb, "%dm", d.Month)
}
if d.Day != 0 || d.Year == 0 && d.Month == 0 {
fmt.Fprintf(&sb, "%dd", d.Day)
}
return sb.String()
}
// MarshalText implements encoding.TextMarshaler
func (d Duration) MarshalText() ([]byte, error) {
return []byte(d.String()), nil
}
// UnmarshalText implements encoding.TextUnmarshaler
func (d *Duration) UnmarshalText(b []byte) error {
dn, ok := ParseDuration(string(b))
if !ok {
return fmt.Errorf("date: failed to parse duration %q", b)
}
*d = dn
return nil
}