mirror of
https://github.com/go-gitea/gitea
synced 2024-09-05 19:36:09 +00:00
141 lines
3.8 KiB
Go
141 lines
3.8 KiB
Go
|
// Copyright (c) 2017 Couchbase, Inc.
|
||
|
//
|
||
|
// Licensed under the Apache License, Version 2.0 (the "License");
|
||
|
// you may not use this file except in compliance with the License.
|
||
|
// You may obtain a copy of the License at
|
||
|
//
|
||
|
// http://www.apache.org/licenses/LICENSE-2.0
|
||
|
//
|
||
|
// Unless required by applicable law or agreed to in writing, software
|
||
|
// distributed under the License is distributed on an "AS IS" BASIS,
|
||
|
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
||
|
// See the License for the specific language governing permissions and
|
||
|
// limitations under the License.
|
||
|
|
||
|
package geo
|
||
|
|
||
|
import (
|
||
|
"reflect"
|
||
|
"strings"
|
||
|
)
|
||
|
|
||
|
// ExtractGeoPoint takes an arbitrary interface{} and tries it's best to
|
||
|
// interpret it is as geo point. Supported formats:
|
||
|
// Container:
|
||
|
// slice length 2 (GeoJSON)
|
||
|
// first element lon, second element lat
|
||
|
// map[string]interface{}
|
||
|
// exact keys lat and lon or lng
|
||
|
// struct
|
||
|
// w/exported fields case-insensitive match on lat and lon or lng
|
||
|
// struct
|
||
|
// satisfying Later and Loner or Lnger interfaces
|
||
|
//
|
||
|
// in all cases values must be some sort of numeric-like thing: int/uint/float
|
||
|
func ExtractGeoPoint(thing interface{}) (lon, lat float64, success bool) {
|
||
|
var foundLon, foundLat bool
|
||
|
|
||
|
thingVal := reflect.ValueOf(thing)
|
||
|
thingTyp := thingVal.Type()
|
||
|
|
||
|
// is it a slice
|
||
|
if thingVal.IsValid() && thingVal.Kind() == reflect.Slice {
|
||
|
// must be length 2
|
||
|
if thingVal.Len() == 2 {
|
||
|
first := thingVal.Index(0)
|
||
|
if first.CanInterface() {
|
||
|
firstVal := first.Interface()
|
||
|
lon, foundLon = extractNumericVal(firstVal)
|
||
|
}
|
||
|
second := thingVal.Index(1)
|
||
|
if second.CanInterface() {
|
||
|
secondVal := second.Interface()
|
||
|
lat, foundLat = extractNumericVal(secondVal)
|
||
|
}
|
||
|
}
|
||
|
}
|
||
|
|
||
|
// is it a map
|
||
|
if l, ok := thing.(map[string]interface{}); ok {
|
||
|
if lval, ok := l["lon"]; ok {
|
||
|
lon, foundLon = extractNumericVal(lval)
|
||
|
} else if lval, ok := l["lng"]; ok {
|
||
|
lon, foundLon = extractNumericVal(lval)
|
||
|
}
|
||
|
if lval, ok := l["lat"]; ok {
|
||
|
lat, foundLat = extractNumericVal(lval)
|
||
|
}
|
||
|
}
|
||
|
|
||
|
// now try reflection on struct fields
|
||
|
if thingVal.IsValid() && thingVal.Kind() == reflect.Struct {
|
||
|
for i := 0; i < thingVal.NumField(); i++ {
|
||
|
fieldName := thingTyp.Field(i).Name
|
||
|
if strings.HasPrefix(strings.ToLower(fieldName), "lon") {
|
||
|
if thingVal.Field(i).CanInterface() {
|
||
|
fieldVal := thingVal.Field(i).Interface()
|
||
|
lon, foundLon = extractNumericVal(fieldVal)
|
||
|
}
|
||
|
}
|
||
|
if strings.HasPrefix(strings.ToLower(fieldName), "lng") {
|
||
|
if thingVal.Field(i).CanInterface() {
|
||
|
fieldVal := thingVal.Field(i).Interface()
|
||
|
lon, foundLon = extractNumericVal(fieldVal)
|
||
|
}
|
||
|
}
|
||
|
if strings.HasPrefix(strings.ToLower(fieldName), "lat") {
|
||
|
if thingVal.Field(i).CanInterface() {
|
||
|
fieldVal := thingVal.Field(i).Interface()
|
||
|
lat, foundLat = extractNumericVal(fieldVal)
|
||
|
}
|
||
|
}
|
||
|
}
|
||
|
}
|
||
|
|
||
|
// last hope, some interfaces
|
||
|
// lon
|
||
|
if l, ok := thing.(loner); ok {
|
||
|
lon = l.Lon()
|
||
|
foundLon = true
|
||
|
} else if l, ok := thing.(lnger); ok {
|
||
|
lon = l.Lng()
|
||
|
foundLon = true
|
||
|
}
|
||
|
// lat
|
||
|
if l, ok := thing.(later); ok {
|
||
|
lat = l.Lat()
|
||
|
foundLat = true
|
||
|
}
|
||
|
|
||
|
return lon, lat, foundLon && foundLat
|
||
|
}
|
||
|
|
||
|
// extract numeric value (if possible) and returns a float64
|
||
|
func extractNumericVal(v interface{}) (float64, bool) {
|
||
|
val := reflect.ValueOf(v)
|
||
|
typ := val.Type()
|
||
|
switch typ.Kind() {
|
||
|
case reflect.Float32, reflect.Float64:
|
||
|
return val.Float(), true
|
||
|
case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64:
|
||
|
return float64(val.Int()), true
|
||
|
case reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64:
|
||
|
return float64(val.Uint()), true
|
||
|
}
|
||
|
|
||
|
return 0, false
|
||
|
}
|
||
|
|
||
|
// various support interfaces which can be used to find lat/lon
|
||
|
type loner interface {
|
||
|
Lon() float64
|
||
|
}
|
||
|
|
||
|
type later interface {
|
||
|
Lat() float64
|
||
|
}
|
||
|
|
||
|
type lnger interface {
|
||
|
Lng() float64
|
||
|
}
|