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timing.go
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timing.go
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package meta
import (
"sort"
"strings"
"time"
)
const (
timingStation = iota
timingLocation
timingCorrection
timingStart
timingEnd
timingLast
)
var timingHeaders Header = map[string]int{
"Station": timingStation,
"Location": timingLocation,
"Correction": timingCorrection,
"Start Date": timingStart,
"End Date": timingEnd,
}
type Timing struct {
Span
Station string
Location string
Correction time.Duration
correction string
}
func (t Timing) Less(timing Timing) bool {
switch {
case t.Station < timing.Station:
return true
case t.Station > timing.Station:
return false
case t.Location < timing.Location:
return true
case t.Location > timing.Location:
return false
case t.Start.Before(timing.Start):
return true
default:
return false
}
}
type TimingList []Timing
func (t TimingList) Len() int { return len(t) }
func (t TimingList) Swap(i, j int) { t[i], t[j] = t[j], t[i] }
func (t TimingList) Less(i, j int) bool { return t[i].Less(t[j]) }
func (t TimingList) encode() [][]string {
var data [][]string
data = append(data, timingHeaders.Columns())
for _, row := range t {
correction := strings.TrimSpace(row.correction)
data = append(data, []string{
strings.TrimSpace(row.Station),
strings.TrimSpace(row.Location),
correction,
row.Start.Format(DateTimeFormat),
row.End.Format(DateTimeFormat),
})
}
return data
}
func (t *TimingList) decode(data [][]string) error {
if !(len(data) > 1) {
return nil
}
var timings []Timing
fields := timingHeaders.Fields(data[0])
for _, row := range data[1:] {
// reorder the entries based on field labels
entries := fields.Remap(row)
start, err := time.Parse(DateTimeFormat, entries[timingStart])
if err != nil {
return err
}
end, err := time.Parse(DateTimeFormat, entries[timingEnd])
if err != nil {
return err
}
var correction time.Duration
if str := entries[timingCorrection]; str != "" {
corr, err := time.ParseDuration(str)
if err != nil {
return err
}
correction = corr
}
timings = append(timings, Timing{
Station: strings.TrimSpace(entries[timingStation]),
Location: strings.TrimSpace(entries[timingLocation]),
Correction: correction,
Span: Span{
Start: start,
End: end,
},
correction: strings.TrimSpace(entries[timingCorrection]),
})
}
*t = TimingList(timings)
return nil
}
func LoadTimings(path string) ([]Timing, error) {
var timings []Timing
if err := LoadList(path, (*TimingList)(&timings)); err != nil {
return nil, err
}
sort.Sort(TimingList(timings))
return timings, nil
}