70 lines
1.9 KiB
Go
70 lines
1.9 KiB
Go
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package values
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import (
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"fmt"
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"github.com/dolanor/caldav-go/utils"
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"log"
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"strconv"
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"strings"
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)
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var _ = log.Print
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// a representation of a geographical point for iCalendar
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type Geo struct {
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coords []float64
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}
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// creates a new icalendar geo representation
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func NewGeo(lat, lng float64) *Geo {
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return &Geo{coords: []float64{lat, lng}}
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}
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// returns the latitude encoded into the geo point
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func (g *Geo) Lat() float64 {
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return g.coords[0]
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}
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// returns the longitude encoded into the geo point
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func (g *Geo) Lng() float64 {
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return g.coords[1]
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}
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// validates the geo value against the iCalendar specification
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func (g *Geo) ValidateICalValue() error {
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if len(g.coords) != 2 {
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return utils.NewError(g.ValidateICalValue, "geo value must have length of 2", g, nil)
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}
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if g.Lat() < -90 || g.Lat() > 90 {
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return utils.NewError(g.ValidateICalValue, "geo latitude must be between -90 and 90 degrees", g, nil)
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}
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if g.Lng() < -180 || g.Lng() > 180 {
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return utils.NewError(g.ValidateICalValue, "geo longitude must be between -180 and 180 degrees", g, nil)
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}
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return nil
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}
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// encodes the geo value for the iCalendar specification
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func (g *Geo) EncodeICalValue() (string, error) {
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return fmt.Sprintf("%f %f", g.Lat(), g.Lng()), nil
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}
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// decodes the geo value from the iCalendar specification
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func (g *Geo) DecodeICalValue(value string) error {
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if latlng := strings.Split(value, " "); len(latlng) < 2 {
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return utils.NewError(g.DecodeICalValue, "geo value must have both a latitude and longitude component", g, nil)
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} else if lat, err := strconv.ParseFloat(latlng[0], 64); err != nil {
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return utils.NewError(g.DecodeICalValue, "unable to decode latitude component", g, err)
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} else if lng, err := strconv.ParseFloat(latlng[1], 64); err != nil {
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return utils.NewError(g.DecodeICalValue, "unable to decode latitude component", g, err)
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} else {
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*g = Geo{coords: []float64{lat, lng}}
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return nil
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}
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}
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