112 lines
2.8 KiB
Go
112 lines
2.8 KiB
Go
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package calendar
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import (
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"strings"
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"time"
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ics "github.com/arran4/golang-ical"
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)
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// CalendarClass is a class that represents what "class" the specified event is
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//
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// Currently, I have only observed this value as being `PUBLIC`, but other
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// values are handled as panics
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type CalendarClass byte
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const (
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ClassPublic CalendarClass = iota
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)
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func ParseClass(raw string) CalendarClass {
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switch raw {
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case "PUBLIC":
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return ClassPublic
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}
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panic("Unknown class: " + raw)
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}
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func (cc CalendarClass) String() string {
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switch cc {
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case ClassPublic:
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return "PUBLIC"
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default:
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panic("Unknown class")
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}
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}
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// CalendarEvent represents a single event in a calendar that is tied to a certain date
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type CalendarEvent struct {
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UID string
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// A summary of the event, including the name of the event
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// This value is set every time as far as I can tell
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Summary string
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// A fescription of the event, including more specific information. Not always
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// set, so don't rely on it
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Description string
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// Access class? of the event
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Class CalendarClass
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LastModified time.Time
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DateStamp time.Time
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StartTime time.Time
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EndTime time.Time
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// Every event comes with a category. This usually contains the name of the
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// class, along with some other information (Semester code, CRN, sections)
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Category struct {
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ClassName string
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OtherData string
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}
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}
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const calendarTimeFormat = "20060102T150405Z"
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// FromVEvent parses an ICS VEvent's format and outputs a specific calendar event, or an error
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func FromVEvent(external *ics.VEvent) (event CalendarEvent, err error) {
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if len(external.Components) > 0 {
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panic("Event has unhandled components")
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}
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for _, prop := range external.Properties {
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if len(prop.ICalParameters) > 0 {
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panic("Property has unhandled ICalParameters")
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}
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switch prop.IANAToken {
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case "UID":
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event.UID = prop.Value
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case "SUMMARY":
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event.Summary = prop.Value
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case "DESCRIPTION":
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event.Description = prop.Value
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case "CLASS":
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event.Class = ParseClass(prop.Value)
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case "LAST-MODIFIED":
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event.LastModified, err = time.Parse(calendarTimeFormat, prop.Value)
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if err != nil {
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return event, err
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}
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case "DTSTAMP":
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event.DateStamp, err = time.Parse(calendarTimeFormat, prop.Value)
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if err != nil {
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return event, err
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}
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case "DTSTART":
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event.StartTime, err = time.Parse(calendarTimeFormat, prop.Value)
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if err != nil {
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return event, err
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}
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case "DTEND":
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event.EndTime, err = time.Parse(calendarTimeFormat, prop.Value)
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if err != nil {
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return event, err
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}
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case "CATEGORIES":
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dashIndex := strings.Index(prop.Value, "-")
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event.Category.ClassName = prop.Value[:dashIndex]
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event.Category.OtherData = prop.Value[dashIndex:]
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default:
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panic("Unknown token when parsing event: " + prop.IANAToken)
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}
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}
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return event, nil
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}
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