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ogckml22.go
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ogckml22.go
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package kml
import (
"encoding/xml"
"fmt"
"io"
"strconv"
"strings"
)
// Namespace is the default namespace.
const Namespace = "http://www.opengis.net/kml/2.2"
const defaultLinkSnippetMaxLines = 2
// A Coordinate is a single geographical coordinate.
type Coordinate struct {
Lon float64 // Longitude in degrees.
Lat float64 // Latitude in degrees.
Alt float64 // Altitude in meters.
}
// CoordinatesElement is a coordinates element composed of Coordinates.
type CoordinatesElement []Coordinate
// Coordinates returns a new CoordinatesElement.
func Coordinates(value ...Coordinate) CoordinatesElement {
return CoordinatesElement(value)
}
// MarshalXML implements encoding/xml.Marshaler.MarshalXML.
func (e CoordinatesElement) MarshalXML(encoder *xml.Encoder, _ xml.StartElement) error {
startElement := xml.StartElement{Name: xml.Name{Local: "coordinates"}}
var builder strings.Builder
builder.Grow(3 * float64StringSize * len(e))
for i, c := range e {
if i != 0 {
builder.WriteByte(' ')
}
builder.WriteString(strconv.FormatFloat(c.Lon, 'f', -1, 64))
builder.WriteByte(',')
builder.WriteString(strconv.FormatFloat(c.Lat, 'f', -1, 64))
if c.Alt != 0 {
builder.WriteByte(',')
builder.WriteString(strconv.FormatFloat(c.Alt, 'f', -1, 64))
}
}
charData := xml.CharData(builder.String())
return encodeElementWithCharData(encoder, startElement, charData)
}
// CoordinatesFlatElement is a coordinates element composed of flat coordinates.
type CoordinatesFlatElement struct {
FlatCoords []float64
Offset int
End int
Stride int
Dim int
}
// CoordinatesFlat returns a new Coordinates element from flat coordinates.
func CoordinatesFlat(flatCoords []float64, offset, end, stride, dim int) *CoordinatesFlatElement {
return &CoordinatesFlatElement{
FlatCoords: flatCoords,
Offset: offset,
End: end,
Stride: stride,
Dim: dim,
}
}
// MarshalXML implements encoding/xml.Marshaler.MarshalXML.
func (e *CoordinatesFlatElement) MarshalXML(encoder *xml.Encoder, _ xml.StartElement) error {
startElement := xml.StartElement{Name: xml.Name{Local: "coordinates"}}
var builder strings.Builder
builder.Grow(3 * float64StringSize * (e.End - e.Offset) / e.Stride)
for i := e.Offset; i < e.End; i += e.Stride {
if i != e.Offset {
builder.WriteByte(' ')
}
builder.WriteString(strconv.FormatFloat(e.FlatCoords[i], 'f', -1, 64))
builder.WriteByte(',')
builder.WriteString(strconv.FormatFloat(e.FlatCoords[i+1], 'f', -1, 64))
if e.Dim > 2 && e.FlatCoords[i+2] != 0 {
builder.WriteByte(',')
builder.WriteString(strconv.FormatFloat(e.FlatCoords[i+2], 'f', -1, 64))
}
}
charData := xml.CharData(builder.String())
return encodeElementWithCharData(encoder, startElement, charData)
}
// CoordinatesSliceElement is a coordinates element composed of a slice of []float64s.
type CoordinatesSliceElement [][]float64
// CoordinatesSlice returns a new CoordinatesArrayElement.
func CoordinatesSlice(value ...[]float64) CoordinatesSliceElement {
return CoordinatesSliceElement(value)
}
// MarshalXML implements encoding/xml.Marshaler.MarshalXML.
func (e CoordinatesSliceElement) MarshalXML(encoder *xml.Encoder, _ xml.StartElement) error {
startElement := xml.StartElement{Name: xml.Name{Local: "coordinates"}}
var builder strings.Builder
builder.Grow(3 * float64StringSize * len(e))
for i, c := range e {
if i != 0 {
builder.WriteByte(' ')
}
builder.WriteString(strconv.FormatFloat(c[0], 'f', -1, 64))
builder.WriteByte(',')
builder.WriteString(strconv.FormatFloat(c[1], 'f', -1, 64))
if len(c) > 2 && c[2] != 0 {
builder.WriteByte(',')
builder.WriteString(strconv.FormatFloat(c[2], 'f', -1, 64))
}
}
charData := xml.CharData(builder.String())
return encodeElementWithCharData(encoder, startElement, charData)
}
// A DataElement is a Data element.
type DataElement struct {
Name string
Children []Element
}
// Data returns a new DataElement.
func Data(name string, children ...Element) *DataElement {
return &DataElement{
Name: name,
Children: children,
}
}
// Append appends children to e.
func (e *DataElement) Append(children ...Element) *DataElement {
e.Children = append(e.Children, children...)
return e
}
// MarshalXML implements encoding/xml.Marshaler.MarshalXML.
func (e *DataElement) MarshalXML(encoder *xml.Encoder, _ xml.StartElement) error {
startElement := xml.StartElement{
Name: xml.Name{Local: "Data"},
Attr: []xml.Attr{
{Name: xml.Name{Local: "name"}, Value: e.Name},
},
}
return encodeElementWithChildren(encoder, startElement, e.Children)
}
// A KMLElement is a kml element.
type KMLElement struct { //nolint:revive
Child Element
}
// KML returns a new KMLElement.
func KML(child Element) *KMLElement {
return &KMLElement{
Child: child,
}
}
// MarshalXML implements encoding/xml.Marshaler.MarshalXML.
func (e *KMLElement) MarshalXML(encoder *xml.Encoder, _ xml.StartElement) error {
startElement := xml.StartElement{
Name: xml.Name{Space: Namespace, Local: "kml"},
}
return encodeElementWithChild(encoder, startElement, e.Child)
}
// Write writes e to w.
func (e *KMLElement) Write(w io.Writer) error {
return write(w, e)
}
// WriteIndent writes e to w with the given prefix and indent.
func (e *KMLElement) WriteIndent(w io.Writer, prefix, indent string) error {
return writeIndent(w, e, prefix, indent)
}
// A LinkSnippetElement is a LinkSnippet element.
type LinkSnippetElement struct {
MaxLines int
Value string
}
// LinkSnippet returns a new LinkSnippetElement.
func LinkSnippet(value string) *LinkSnippetElement {
return &LinkSnippetElement{
MaxLines: defaultLinkSnippetMaxLines,
Value: value,
}
}
// MarshalXML implements encoding/xml.Marshaler.MarshalXML.
func (e *LinkSnippetElement) MarshalXML(encoder *xml.Encoder, _ xml.StartElement) error {
startElement := xml.StartElement{Name: xml.Name{Local: "linkSnippet"}}
if e.MaxLines != defaultLinkSnippetMaxLines {
startElement.Attr = []xml.Attr{
{Name: xml.Name{Local: "maxLines"}, Value: strconv.Itoa(e.MaxLines)},
}
}
charData := xml.CharData(e.Value)
return encodeElementWithCharData(encoder, startElement, charData)
}
// WithMaxLines sets e's maxLines attribute.
func (e *LinkSnippetElement) WithMaxLines(maxLines int) *LinkSnippetElement {
e.MaxLines = maxLines
return e
}
// A ModelScaleElement is a Scale element.
type ModelScaleElement struct {
Children []Element
}
// ModelScale returns a new ModelScaleElement.
func ModelScale(children ...Element) *ModelScaleElement {
return &ModelScaleElement{
Children: children,
}
}
// Append appends children to e.
func (e *ModelScaleElement) Append(children ...Element) *ModelScaleElement {
e.Children = append(e.Children, children...)
return e
}
// MarshalXML implements encoding/xml.Marshaler.MarshalXML.
func (e *ModelScaleElement) MarshalXML(encoder *xml.Encoder, _ xml.StartElement) error {
startElement := xml.StartElement{Name: xml.Name{Local: "Scale"}}
return encodeElementWithChildren(encoder, startElement, e.Children)
}
// A SchemaElement is a Schema element.
type SchemaElement struct {
ID string
Name string
Children []Element
}
// NamedSchema returns a new SchemaElement with the given name.
func NamedSchema(id, name string, children ...Element) *SchemaElement {
return &SchemaElement{
ID: id,
Name: name,
Children: children,
}
}
// Schema returns a new SchemaElement.
func Schema(id string, children ...Element) *SchemaElement {
return &SchemaElement{
ID: id,
Children: children,
}
}
// Append appends children to e.
func (e *SchemaElement) Append(children ...Element) *SchemaElement {
e.Children = append(e.Children, children...)
return e
}
// MarshalXML implements encoding/xml.Marshaler.MarshalXML.
func (e *SchemaElement) MarshalXML(encoder *xml.Encoder, _ xml.StartElement) error {
startElement := xml.StartElement{
Name: xml.Name{Local: "Schema"},
Attr: []xml.Attr{
{Name: xml.Name{Local: "id"}, Value: e.ID},
},
}
if e.Name != "" {
startElement.Attr = append(startElement.Attr,
xml.Attr{Name: xml.Name{Local: "name"}, Value: e.Name},
)
}
return encodeElementWithChildren(encoder, startElement, e.Children)
}
// WithName sets e's name.
func (e *SchemaElement) WithName(name string) *SchemaElement {
e.Name = name
return e
}
// URL return e's URL.
func (e *SchemaElement) URL() string {
if e.ID == "" {
return ""
}
return "#" + e.ID
}
// A SchemaDataElement is a SchemaData element.
type SchemaDataElement struct {
SchemaURL string
Children []Element
}
// SchemaData returns a new SchemaDataElement.
func SchemaData(schemaURL string, children ...Element) *SchemaDataElement {
return &SchemaDataElement{
SchemaURL: schemaURL,
Children: children,
}
}
// Append appends children to e.
func (e *SchemaDataElement) Append(children ...Element) *SchemaDataElement {
e.Children = append(e.Children, children...)
return e
}
// MarshalXML implements encoding/xml.Marshaler.MarshalXML.
func (e *SchemaDataElement) MarshalXML(encoder *xml.Encoder, _ xml.StartElement) error {
startElement := xml.StartElement{
Name: xml.Name{Local: "SchemaData"},
Attr: []xml.Attr{
{Name: xml.Name{Local: "schemaUrl"}, Value: e.SchemaURL},
},
}
return encodeElementWithChildren(encoder, startElement, e.Children)
}
// A SimpleDataElement is a SimpleData element.
type SimpleDataElement struct {
Name string
Value string
}
// SimpleData returns a new SimpleDataElement.
func SimpleData(name, value string) *SimpleDataElement {
return &SimpleDataElement{
Name: name,
Value: value,
}
}
// MarshalXML implements encoding/xml.Marshaler.MarshalXML.
func (e *SimpleDataElement) MarshalXML(encoder *xml.Encoder, _ xml.StartElement) error {
startElement := xml.StartElement{
Name: xml.Name{Local: "SimpleData"},
Attr: []xml.Attr{
{Name: xml.Name{Local: "name"}, Value: e.Name},
},
}
charData := xml.CharData(e.Value)
return encodeElementWithCharData(encoder, startElement, charData)
}
// A SimpleFieldElement is a SimpleField element.
type SimpleFieldElement struct {
Name string
Type string
Children []Element
}
// SimpleField returns a new SimpleFieldElement.
func SimpleField(name, _type string, children ...Element) *SimpleFieldElement {
return &SimpleFieldElement{
Name: name,
Type: _type,
Children: children,
}
}
// Append appends children to e.
func (e *SimpleFieldElement) Append(children ...Element) *SimpleFieldElement {
e.Children = append(e.Children, children...)
return e
}
// MarshalXML implements encoding/xml.Marshaler.MarshalXML.
func (e *SimpleFieldElement) MarshalXML(encoder *xml.Encoder, _ xml.StartElement) error {
startElement := xml.StartElement{
Name: xml.Name{Local: "SimpleField"},
Attr: []xml.Attr{
{Name: xml.Name{Local: "name"}, Value: e.Name},
{Name: xml.Name{Local: "type"}, Value: e.Type},
},
}
return encodeElementWithChildren(encoder, startElement, e.Children)
}
// A SnippetElement is a snippet element.
type SnippetElement struct {
MaxLines int
Value string
}
// Snippet returns a new SnippetElement.
func Snippet(value string) *SnippetElement {
return &SnippetElement{
MaxLines: defaultLinkSnippetMaxLines,
Value: value,
}
}
// MarshalXML implements encoding/xml.Marshaler.MarshalXML.
func (e *SnippetElement) MarshalXML(encoder *xml.Encoder, _ xml.StartElement) error {
startElement := xml.StartElement{Name: xml.Name{Local: "Snippet"}}
if e.MaxLines != defaultLinkSnippetMaxLines {
startElement.Attr = []xml.Attr{
{Name: xml.Name{Local: "maxLines"}, Value: strconv.Itoa(e.MaxLines)},
}
}
charData := xml.CharData(e.Value)
return encodeElementWithCharData(encoder, startElement, charData)
}
// WithMaxLines sets e's maxLines attribute.
func (e *SnippetElement) WithMaxLines(maxLines int) *SnippetElement {
e.MaxLines = maxLines
return e
}
// A StyleElement is a Style element.
type StyleElement struct {
ID string
Children []Element
}
// SharedStyle returns a new StyleElement with the given id.
func SharedStyle(id string, children ...Element) *StyleElement {
return &StyleElement{
ID: id,
Children: children,
}
}
// Style returns a new StyleElement.
func Style(children ...Element) *StyleElement {
return &StyleElement{
Children: children,
}
}
// Append appends children to e.
func (e *StyleElement) Append(children ...Element) *StyleElement {
e.Children = append(e.Children, children...)
return e
}
// MarshalXML implements encoding/xml.Marshaler.MarshalXML.
func (e *StyleElement) MarshalXML(encoder *xml.Encoder, _ xml.StartElement) error {
startElement := xml.StartElement{Name: xml.Name{Local: "Style"}}
if e.ID != "" {
startElement.Attr = []xml.Attr{
{Name: xml.Name{Local: "id"}, Value: e.ID},
}
}
return encodeElementWithChildren(encoder, startElement, e.Children)
}
// URL return e's URL.
func (e *StyleElement) URL() string {
if e.ID == "" {
return ""
}
return "#" + e.ID
}
// WithID sets e's ID.
func (e *StyleElement) WithID(id string) *StyleElement {
e.ID = id
return e
}
// A StyleMapElement is a StyleMap element.
type StyleMapElement struct {
ID string
Children []Element
}
// SharedStyleMap returns a new StyleMapElement with the given id.
func SharedStyleMap(id string, children ...Element) *StyleMapElement {
return &StyleMapElement{
ID: id,
Children: children,
}
}
// StyleMap returns a new StyleMapElement.
func StyleMap(children ...Element) *StyleMapElement {
return &StyleMapElement{
Children: children,
}
}
// Append appends children to e.
func (e *StyleMapElement) Append(children ...Element) *StyleMapElement {
e.Children = append(e.Children, children...)
return e
}
// MarshalXML implements encoding/xml.Marshaler.MarshalXML.
func (e *StyleMapElement) MarshalXML(encoder *xml.Encoder, _ xml.StartElement) error {
startElement := xml.StartElement{Name: xml.Name{Local: "StyleMap"}}
if e.ID != "" {
startElement.Attr = []xml.Attr{
{Name: xml.Name{Local: "id"}, Value: e.ID},
}
}
return encodeElementWithChildren(encoder, startElement, e.Children)
}
// URL return e's URL.
func (e *StyleMapElement) URL() string {
if e.ID == "" {
return ""
}
return "#" + e.ID
}
// WithID sets e's ID.
func (e *StyleMapElement) WithID(id string) *StyleMapElement {
e.ID = id
return e
}
// A ValueElement is a value element.
type ValueElement struct {
Value any
}
// Value returns a new ValueElement.
func Value(value any) *ValueElement {
return &ValueElement{
Value: value,
}
}
// MarshalXML implements encoding/xml.Marshaler.MarshalXML.
func (e *ValueElement) MarshalXML(encoder *xml.Encoder, _ xml.StartElement) error {
startElement := xml.StartElement{Name: xml.Name{Local: "value"}}
charData, err := charData(e.Value)
if err != nil {
return err
}
return encodeElementWithCharData(encoder, startElement, charData)
}
// A Vec2 is a vec2.
type Vec2 struct {
X float64
Y float64
XUnits UnitsEnum
YUnits UnitsEnum
}
// attr returns a slice of attributes populated with v's values.
func (v *Vec2) attr() []xml.Attr {
return []xml.Attr{
{Name: xml.Name{Local: "x"}, Value: strconv.FormatFloat(v.X, 'f', -1, 64)},
{Name: xml.Name{Local: "y"}, Value: strconv.FormatFloat(v.Y, 'f', -1, 64)},
{Name: xml.Name{Local: "xunits"}, Value: string(v.XUnits)},
{Name: xml.Name{Local: "yunits"}, Value: string(v.YUnits)},
}
}
func charData(value any) (xml.CharData, error) {
switch value := value.(type) {
case nil:
return nil, nil
case xml.CharData:
return value, nil
case fmt.Stringer:
return xml.CharData(value.String()), nil
case []byte:
return xml.CharData(value), nil
case bool:
return xml.CharData(strconv.FormatBool(value)), nil
case complex64:
return xml.CharData(strconv.FormatComplex(complex128(value), 'f', -1, 64)), nil
case complex128:
return xml.CharData(strconv.FormatComplex(value, 'f', -1, 128)), nil
case float32:
return xml.CharData(strconv.FormatFloat(float64(value), 'f', -1, 64)), nil
case float64:
return xml.CharData(strconv.FormatFloat(value, 'f', -1, 64)), nil
case int:
return xml.CharData(strconv.Itoa(value)), nil
case int8:
return xml.CharData(strconv.FormatInt(int64(value), 10)), nil
case int16:
return xml.CharData(strconv.FormatInt(int64(value), 10)), nil
case int32:
return xml.CharData(strconv.FormatInt(int64(value), 10)), nil
case int64:
return xml.CharData(strconv.FormatInt(value, 10)), nil
case string:
return xml.CharData(value), nil
case uint:
return xml.CharData(strconv.FormatUint(uint64(value), 10)), nil
case uint8:
return xml.CharData(strconv.FormatUint(uint64(value), 10)), nil
case uint16:
return xml.CharData(strconv.FormatUint(uint64(value), 10)), nil
case uint32:
return xml.CharData(strconv.FormatUint(uint64(value), 10)), nil
case uint64:
return xml.CharData(strconv.FormatUint(value, 10)), nil
default:
return nil, &unsupportedTypeError{value: value}
}
}