mirror of https://github.com/perkeep/perkeep.git
152 lines
3.3 KiB
Go
152 lines
3.3 KiB
Go
// +build linux darwin
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/*
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Copyright 2013 The Perkeep Authors
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package fs
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import (
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"errors"
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"fmt"
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"math"
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"strconv"
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"time"
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)
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var timeFormats = []string{
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time.RFC3339Nano,
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time.RFC3339,
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time.RFC1123Z,
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time.RFC1123,
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time.UnixDate,
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time.ANSIC,
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time.RubyDate,
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"2006-01-02T15:04",
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"2006-01-02T15",
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"2006-01-02",
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"2006-01",
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"2006",
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}
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var errUnparseableTimestamp = errors.New("unparsable timestamp")
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var powTable = []int{
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10e8,
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10e7,
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10e6,
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10e5,
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10e4,
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10e3,
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10e2,
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10e1,
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10,
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1,
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}
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// Hand crafted this parser since it's a really common path.
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func parseCanonicalTime(in string) (time.Time, error) {
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if len(in) < 20 || in[len(in)-1] != 'Z' {
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return time.Time{}, errUnparseableTimestamp
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}
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if !(in[4] == '-' && in[7] == '-' && in[10] == 'T' &&
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in[13] == ':' && in[16] == ':' && (in[19] == '.' || in[19] == 'Z')) {
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return time.Time{}, fmt.Errorf("positionally incorrect: %v", in)
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}
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// 2012-08-28T21:24:35.37465188Z
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// 4 7 10 13 16 19
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// -----------------------------
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// 0-4 5 8 11 14 17 20
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year, err := strconv.Atoi(in[0:4])
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if err != nil {
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return time.Time{}, fmt.Errorf("error parsing year: %v", err)
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}
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month, err := strconv.Atoi(in[5:7])
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if err != nil {
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return time.Time{}, fmt.Errorf("error parsing month: %v", err)
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}
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day, err := strconv.Atoi(in[8:10])
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if err != nil {
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return time.Time{}, fmt.Errorf("error parsing day: %v", err)
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}
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hour, err := strconv.Atoi(in[11:13])
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if err != nil {
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return time.Time{}, fmt.Errorf("error parsing hour: %v", err)
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}
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minute, err := strconv.Atoi(in[14:16])
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if err != nil {
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return time.Time{}, fmt.Errorf("error parsing minute: %v", err)
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}
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second, err := strconv.Atoi(in[17:19])
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if err != nil {
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return time.Time{}, fmt.Errorf("error parsing second: %v", err)
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}
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var nsecstr string
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if in[19] != 'Z' {
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nsecstr = in[20 : len(in)-1]
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}
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var nsec int
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if nsecstr != "" {
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nsec, err = strconv.Atoi(nsecstr)
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if err != nil {
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return time.Time{}, fmt.Errorf("error parsing nanoseconds: %v", err)
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}
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}
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nsec *= powTable[len(nsecstr)]
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return time.Date(year, time.Month(month), day,
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hour, minute, second, nsec, time.UTC), nil
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}
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func parseTime(in string) (time.Time, error) {
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// First, try a few numerics
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n, err := strconv.ParseInt(in, 10, 64)
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if err == nil {
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switch {
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case n > int64(math.MaxInt32)*1000:
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// nanosecond timestamps
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return time.Unix(n/1e9, n%1e9), nil
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case n > int64(math.MaxInt32):
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// millisecond timestamps
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return time.Unix(n/1000, (n%1000)*1e6), nil
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case n > 10000:
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// second timestamps
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return time.Unix(n, 0), nil
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}
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}
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rv, err := parseCanonicalTime(in)
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if err == nil {
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return rv, nil
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}
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for _, f := range timeFormats {
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parsed, err := time.Parse(f, in)
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if err == nil {
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return parsed, nil
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}
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}
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return time.Time{}, errUnparseableTimestamp
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}
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