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Benchmark tests for DateParse

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Aaron Raddon 2014-12-05 15:20:57 -08:00
parent 501e3eeb15
commit ceeeb70dcb
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6
README.md
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Go Date Parser Go Date Parser
--------------------------- ---------------------------
Parse Any date format without knowing format in advance. Parse Any date format without knowing format in advance. Uses
a Scan/Lex based approach to minimize shotgun based parse attempts.
See bench_test.go for performance comparison.
```go ```go

118
bench_test.go Normal file
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package dateparse
import (
"fmt"
//"github.com/bmizerany/assert"
"testing"
"time"
)
/*
go test -bench Parse
BenchmarkShotgunParse 50000 37588 ns/op 13258 B/op 167 allocs/op
BenchmarkDateparseParseAny 500000 5752 ns/op 0 B/op 0 allocs/op
*/
func BenchmarkShotgunParse(b *testing.B) {
b.ReportAllocs()
for i := 0; i < b.N; i++ {
for _, dateStr := range testDates {
parseShotgun(dateStr)
}
}
}
func BenchmarkDateparseParseAny(b *testing.B) {
b.ReportAllocs()
for i := 0; i < b.N; i++ {
for _, dateStr := range testDates {
ParseAny(dateStr)
}
}
}
var (
testDates = []string{
"2012/03/19 10:11:59",
"2012/03/19 10:11:59.3186369",
"2009-08-12T22:15:09-07:00",
"2014-04-26 17:24:37.3186369",
"2012-08-03 18:31:59.257000000",
"2013-04-01 22:43:22",
"2014-04-26 17:24:37.123",
"2014-12-16 06:20:00 UTC",
"1384216367189",
"1332151919",
"2014-05-11 08:20:13,787",
"2014-04-26 05:24:37 PM",
"2014-04-26",
}
DateFormatError = fmt.Errorf("Invalid Date Format")
timeFormats = []string{
// ISO 8601ish formats
time.RFC3339Nano,
time.RFC3339,
// Unusual formats, prefer formats with timezones
time.RFC1123Z,
time.RFC1123,
time.RFC822Z,
time.RFC822,
time.UnixDate,
time.RubyDate,
time.ANSIC,
// Hilariously, Go doesn't have a const for it's own time layout.
// See: https://code.google.com/p/go/issues/detail?id=6587
"2006-01-02 15:04:05.999999999 -0700 MST",
// No timezone information
"2006-01-02T15:04:05.999999999",
"2006-01-02T15:04:05",
"2006-01-02 15:04:05.999999999",
"2006-01-02 15:04:05",
}
)
/*
ts, err = ParseAny("May 8, 2009 5:57:51 PM")
ts, err = ParseAny("Mon Jan 2 15:04:05 2006")
ts, err = ParseAny("Mon Jan 2 15:04:05 MST 2006")
ts, err = ParseAny("Mon Jan 02 15:04:05 -0700 2006")
ts, err = ParseAny("Monday, 02-Jan-06 15:04:05 MST")
ts, err = ParseAny("3/31/2014")
ts, err = ParseAny("03/31/2014")
ts, err = ParseAny("4/8/2014 22:05")
ts, err = ParseAny("04/08/2014 22:05")
ts, err = ParseAny("04/2/2014 03:00:51")
ts, err = ParseAny("4/02/2014 03:00:51")
ts, err = ParseAny("03/19/2012 10:11:59")
ts, err = ParseAny("03/19/2012 10:11:59.3186369")
ts, err = ParseAny("2014/3/31")
ts, err = ParseAny("2014/03/31")
ts, err = ParseAny("2014/4/8 22:05")
ts, err = ParseAny("2014/04/08 22:05")
ts, err = ParseAny("2014/04/2 03:00:51")
ts, err = ParseAny("2014/4/02 03:00:51")
ts, err = ParseAny()
*/
// Normalizes a variety of string representations to a time.Time in UTC.
func parseShotgun(raw string) (time.Time, error) {
// We shouldn't need these, dupes of above
// Well it's not a UNIX timestamp, try ISO standards
for _, format := range timeFormats {
t, err := time.Parse(format, raw)
if err == nil {
// Parsed successfully
return t, nil
}
}
return time.Time{}, DateFormatError
}