feat: implement caldav search

vendor/github.com/dolanor/caldav-go/icalendar/values/geo.go

@@ -0,0 +1,69 @@
+package values
+
+import (
+	"fmt"
+	"github.com/dolanor/caldav-go/utils"
+	"log"
+	"strconv"
+	"strings"
+)
+
+var _ = log.Print
+
+// a representation of a geographical point for iCalendar
+type Geo struct {
+	coords []float64
+}
+
+// creates a new icalendar geo representation
+func NewGeo(lat, lng float64) *Geo {
+	return &Geo{coords: []float64{lat, lng}}
+}
+
+// returns the latitude encoded into the geo point
+func (g *Geo) Lat() float64 {
+	return g.coords[0]
+}
+
+// returns the longitude encoded into the geo point
+func (g *Geo) Lng() float64 {
+	return g.coords[1]
+}
+
+// validates the geo value against the iCalendar specification
+func (g *Geo) ValidateICalValue() error {
+
+	if len(g.coords) != 2 {
+		return utils.NewError(g.ValidateICalValue, "geo value must have length of 2", g, nil)
+	}
+
+	if g.Lat() < -90 || g.Lat() > 90 {
+		return utils.NewError(g.ValidateICalValue, "geo latitude must be between -90 and 90 degrees", g, nil)
+	}
+
+	if g.Lng() < -180 || g.Lng() > 180 {
+		return utils.NewError(g.ValidateICalValue, "geo longitude must be between -180 and 180 degrees", g, nil)
+	}
+
+	return nil
+
+}
+
+// encodes the geo value for the iCalendar specification
+func (g *Geo) EncodeICalValue() (string, error) {
+	return fmt.Sprintf("%f %f", g.Lat(), g.Lng()), nil
+}
+
+// decodes the geo value from the iCalendar specification
+func (g *Geo) DecodeICalValue(value string) error {
+	if latlng := strings.Split(value, " "); len(latlng) < 2 {
+		return utils.NewError(g.DecodeICalValue, "geo value must have both a latitude and longitude component", g, nil)
+	} else if lat, err := strconv.ParseFloat(latlng[0], 64); err != nil {
+		return utils.NewError(g.DecodeICalValue, "unable to decode latitude component", g, err)
+	} else if lng, err := strconv.ParseFloat(latlng[1], 64); err != nil {
+		return utils.NewError(g.DecodeICalValue, "unable to decode latitude component", g, err)
+	} else {
+		*g = Geo{coords: []float64{lat, lng}}
+		return nil
+	}
+}