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// Copyright 2015 Rick Beton. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package clock
import (
"fmt"
"runtime"
"strconv"
"strings"
)
// MustParse is as per Parse except that it panics if the string cannot be parsed.
// This is intended for setup code; don't use it for user inputs.
func MustParse(hms string) Clock {
t, err := Parse(hms)
if err != nil {
panic(err)
}
return t
}
// Parse converts a string representation to a Clock. Acceptable representations
// are as per ISO-8601 - see https://en.wikipedia.org/wiki/ISO_8601#Times
//
// Also, conventional AM- and PM-based strings are parsed, such as "2am", "2:45pm".
// Remember that 12am is midnight and 12pm is noon.
func Parse(hms string) (clock Clock, err error) {
if strings.HasSuffix(hms, "am") || strings.HasSuffix(hms, "AM") {
return parseAmPm(hms, 0)
} else if strings.HasSuffix(hms, "pm") || strings.HasSuffix(hms, "PM") {
return parseAmPm(hms, 12)
}
return parseISO(hms)
}
func parseISO(hms string) (clock Clock, err error) {
switch len(hms) {
case 2: // HH
return parseClockParts(hms, hms, "", "", "", 0, 0)
case 4: // HHMM
return parseClockParts(hms, hms[:2], hms[2:], "", "", 0, 0)
case 5: // HH:MM
if hms[2] != ':' {
return 0, parseError(hms, nil)
}
return parseClockParts(hms, hms[:2], hms[3:], "", "", 0, 0)
case 6: // HHMMSS
return parseClockParts(hms, hms[:2], hms[2:4], hms[4:], "", 0, 0)
case 8: // HH:MM:SS
if hms[2] != ':' || hms[5] != ':' {
return 0, parseError(hms, nil)
}
return parseClockParts(hms, hms[:2], hms[3:5], hms[6:], "", 0, 0)
case 9, 10: // HH:MM:SS.0
if hms[2] != ':' || hms[5] != ':' || hms[8] != '.' {
return 0, parseError(hms, nil)
}
return parseClockParts(hms, hms[:2], hms[3:5], hms[6:8], hms[9:]+"00", 0, 0)
case 11: // HH:MM:SS.00
if hms[2] != ':' || hms[5] != ':' || hms[8] != '.' {
return 0, parseError(hms, nil)
}
return parseClockParts(hms, hms[:2], hms[3:5], hms[6:8], hms[9:]+"0", 0, 0)
case 12: // HH:MM:SS.000
if hms[2] != ':' || hms[5] != ':' || hms[8] != '.' {
return 0, parseError(hms, nil)
}
return parseClockParts(hms, hms[:2], hms[3:5], hms[6:8], hms[9:], 0, 0)
}
return 0, parseError(hms, nil)
}
func parseAmPm(hms string, offset int) (clock Clock, err error) {
n := len(hms)
switch len(hms) {
case 3: // Ham
return parseClockParts(hms, "0"+hms[:1], "", "", "", 12, offset)
case 4: // HHam
return parseClockParts(hms, hms[:2], "", "", "", 12, offset)
}
colon := strings.IndexByte(hms, ':')
if colon < 0 {
return 0, parseError(hms, nil)
}
h := hms[:colon]
rest := hms[colon+1 : n-2]
switch len(rest) {
case 2: // MM
return parseClockParts(hms, h, rest, "", "", 12, offset)
case 5: // MM:SS
if rest[2] != ':' {
return 0, parseError(hms, nil)
}
return parseClockParts(hms, h, rest[:2], rest[3:], "", 12, offset)
case 6, 7: // MM:SS.0xm
if rest[2] != ':' || rest[5] != '.' {
return 0, parseError(hms, nil)
}
return parseClockParts(hms, h, rest[:2], rest[3:5], rest[6:]+"00", 12, offset)
case 8: // MM:SS.00xm
if rest[2] != ':' || rest[5] != '.' {
return 0, parseError(hms, nil)
}
return parseClockParts(hms, h, rest[:2], rest[3:5], rest[6:]+"0", 12, offset)
case 9: // MM:SS.000xm
if rest[2] != ':' || rest[5] != '.' {
return 0, parseError(hms, nil)
}
return parseClockParts(hms, h, rest[:2], rest[3:5], rest[6:], 12, offset)
}
return 0, parseError(hms, nil)
}
func parseClockParts(hms, hh, mm, ss, mmms string, mod, offset int) (clock Clock, err error) {
h := 0
m := 0
s := 0
ms := 0
if hh != "" {
h, err = strconv.Atoi(hh)
if err != nil {
return 0, parseError(hms, err)
}
}
if mm != "" {
m, err = strconv.Atoi(mm)
if err != nil {
return 0, parseError(hms, err)
}
}
if ss != "" {
s, err = strconv.Atoi(ss)
if err != nil {
return 0, parseError(hms, err)
}
}
if mmms != "" {
ms, err = strconv.Atoi(mmms)
if err != nil {
return 0, parseError(hms, err)
}
}
if mod > 0 {
h = h % mod
}
return New(h+offset, m, s, ms), nil
}
func parseError(hms string, err error) error {
_, _, line, _ := runtime.Caller(1)
if err != nil {
return fmt.Errorf("parse.go:%d: clock.Clock: cannot parse %s: %v", line, hms, err)
}
return fmt.Errorf("parse.go:%d: clock.Clock: cannot parse %s", line, hms)
}
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