79 lines
1.8 KiB
Go
79 lines
1.8 KiB
Go
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package icalendar
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import (
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"fmt"
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"github.com/dolanor/caldav-go/icalendar/properties"
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"github.com/dolanor/caldav-go/utils"
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"log"
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"reflect"
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"strings"
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)
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var _ = log.Print
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func isInvalidOrEmptyValue(v reflect.Value) bool {
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if !v.IsValid() {
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return true
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}
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switch v.Kind() {
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case reflect.Array, reflect.Map, reflect.Slice, reflect.String:
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return v.Len() == 0
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case reflect.Bool:
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return !v.Bool()
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case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64:
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return v.Int() == 0
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case reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64, reflect.Uintptr:
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return v.Uint() == 0
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case reflect.Float32, reflect.Float64:
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return v.Float() == 0
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case reflect.Interface, reflect.Ptr:
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return v.IsNil()
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}
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return false
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}
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func newValue(in reflect.Value) (out reflect.Value, isArrayElement bool) {
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typ := in.Type()
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kind := typ.Kind()
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for {
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if kind == reflect.Array || kind == reflect.Slice {
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isArrayElement = true
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} else if kind != reflect.Ptr {
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break
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}
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typ = typ.Elem()
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kind = typ.Kind()
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}
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out = reflect.New(typ)
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return
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}
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func dereferencePointerValue(v reflect.Value) reflect.Value {
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for (v.Kind() == reflect.Interface || v.Kind() == reflect.Ptr) && v.Elem().IsValid() {
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v = v.Elem()
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}
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return v
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}
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func extractTagFromValue(v reflect.Value) (string, error) {
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vdref := dereferencePointerValue(v)
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vtemp, _ := newValue(vdref)
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if encoder, ok := vtemp.Interface().(properties.CanEncodeTag); ok {
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if tag, err := encoder.EncodeICalTag(); err != nil {
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return "", utils.NewError(extractTagFromValue, "unable to extract tag from interface", v.Interface(), err)
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} else {
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return strings.ToUpper(tag), nil
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}
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} else {
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typ := vtemp.Elem().Type()
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return strings.ToUpper(fmt.Sprintf("v%s", typ.Name())), nil
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}
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}
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