forked from NYANDEV/forgejo
b6a95a8cb3
* Dropped unused codekit config * Integrated dynamic and static bindata for public * Ignore public bindata * Add a general generate make task * Integrated flexible public assets into web command * Updated vendoring, added all missiong govendor deps * Made the linter happy with the bindata and dynamic code * Moved public bindata definition to modules directory * Ignoring the new bindata path now * Updated to the new public modules import path * Updated public bindata command and drop the new prefix
92 lines
2.1 KiB
Go
92 lines
2.1 KiB
Go
// Copyright 2015 PingCAP, 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,
|
|
// See the License for the specific language governing permissions and
|
|
// limitations under the License.
|
|
|
|
package mysql
|
|
|
|
import (
|
|
"math"
|
|
"strconv"
|
|
"strings"
|
|
|
|
"github.com/juju/errors"
|
|
)
|
|
|
|
const (
|
|
// UnspecifiedFsp is the unspecified fractional seconds part.
|
|
UnspecifiedFsp int = -1
|
|
// MaxFsp is the maximum digit of fractional seconds part.
|
|
MaxFsp int = 6
|
|
// MinFsp is the minimum digit of fractional seconds part.
|
|
MinFsp int = 0
|
|
// DefaultFsp is the default digit of fractional seconds part.
|
|
// MySQL use 0 as the default Fsp.
|
|
DefaultFsp int = 0
|
|
)
|
|
|
|
func checkFsp(fsp int) (int, error) {
|
|
if fsp == UnspecifiedFsp {
|
|
return DefaultFsp, nil
|
|
}
|
|
if fsp < MinFsp || fsp > MaxFsp {
|
|
return DefaultFsp, errors.Errorf("Invalid fsp %d", fsp)
|
|
}
|
|
return fsp, nil
|
|
}
|
|
|
|
func parseFrac(s string, fsp int) (int, error) {
|
|
if len(s) == 0 {
|
|
return 0, nil
|
|
}
|
|
|
|
var err error
|
|
fsp, err = checkFsp(fsp)
|
|
if err != nil {
|
|
return 0, errors.Trace(err)
|
|
}
|
|
|
|
// Use float to calculate frac, e.g, "123" -> "0.123"
|
|
if !strings.HasPrefix(s, ".") && !strings.HasPrefix(s, "0.") {
|
|
s = "0." + s
|
|
}
|
|
|
|
frac, err := strconv.ParseFloat(s, 64)
|
|
if err != nil {
|
|
return 0, errors.Trace(err)
|
|
}
|
|
|
|
// round frac to the nearest value with FSP
|
|
var round float64
|
|
pow := math.Pow(10, float64(fsp))
|
|
digit := pow * frac
|
|
_, div := math.Modf(digit)
|
|
if div >= 0.5 {
|
|
round = math.Ceil(digit)
|
|
} else {
|
|
round = math.Floor(digit)
|
|
}
|
|
|
|
// Get the final frac, with 6 digit number
|
|
// 0.1236 round 3 -> 124 -> 123000
|
|
// 0.0312 round 2 -> 3 -> 30000
|
|
return int(round * math.Pow10(MaxFsp-fsp)), nil
|
|
}
|
|
|
|
// alignFrac is used to generate alignment frac, like `100` -> `100000`
|
|
func alignFrac(s string, fsp int) string {
|
|
sl := len(s)
|
|
if sl < fsp {
|
|
return s + strings.Repeat("0", fsp-sl)
|
|
}
|
|
|
|
return s
|
|
}
|