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raw.go
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raw.go
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package app
import (
"context"
"io"
"net/url"
"strings"
"github.com/maxence-charriere/go-app/v7/pkg/errors"
)
// Raw returns a ui element from the given raw value. HTML raw value must have a
// single root.
//
// It is not recommended to use this kind of node since there is no check on the
// raw string content.
func Raw(v string) UI {
v = strings.TrimSpace(v)
tag := rawRootTagName(v)
if tag == "" {
v = "<div></div>"
}
return &raw{
value: v,
tag: tag,
}
}
type raw struct {
jsvalue Value
parentElem UI
tag string
value string
}
func (r *raw) Kind() Kind {
return RawHTML
}
func (r *raw) JSValue() Value {
return r.jsvalue
}
func (r *raw) Mounted() bool {
return r.jsvalue != nil
}
func (r *raw) name() string {
return "raw." + r.tag
}
func (r *raw) self() UI {
return r
}
func (r *raw) setSelf(UI) {
}
func (r *raw) context() context.Context {
return nil
}
func (r *raw) attributes() map[string]string {
return nil
}
func (r *raw) eventHandlers() map[string]eventHandler {
return nil
}
func (r *raw) parent() UI {
return r.parentElem
}
func (r *raw) setParent(p UI) {
r.parentElem = p
}
func (r *raw) children() []UI {
return nil
}
func (r *raw) mount() error {
if r.Mounted() {
return errors.New("mounting raw html element failed").
Tag("reason", "already mounted").
Tag("name", r.name()).
Tag("kind", r.Kind())
}
wrapper := Window().Get("document").Call("createElement", "div")
wrapper.Set("innerHTML", r.value)
value := wrapper.Get("firstChild")
if !value.Truthy() {
return errors.New("mounting raw html element failed").
Tag("reason", "converting raw html to html elements returned nil").
Tag("name", r.name()).
Tag("kind", r.Kind()).
Tag("raw-html", r.value)
}
wrapper.Call("removeChild", value)
r.jsvalue = value
return nil
}
func (r *raw) dismount() {
r.jsvalue = nil
}
func (r *raw) update(n UI) error {
if !r.Mounted() {
return nil
}
if n.Kind() != r.Kind() || r.name() != r.name() {
return errors.New("updating raw html element failed").
Tag("replace", true).
Tag("reason", "different element types").
Tag("current-kind", r.Kind()).
Tag("current-name", r.name()).
Tag("updated-kind", n.Kind()).
Tag("updated-name", n.name())
}
if v := n.(*raw).value; r.value != v {
return errors.New("updating raw html element failed").
Tag("replace", true).
Tag("reason", "different raw values").
Tag("current-value", r.value).
Tag("new-value", v)
}
return nil
}
func (r *raw) onNav(*url.URL) {
}
func (r *raw) onAppUpdate() {
}
func (r *raw) html(w io.Writer) {
r.htmlWithIndent(w, 0)
}
func (r *raw) htmlWithIndent(w io.Writer, indent int) {
writeIndent(w, indent)
w.Write(stob(r.value))
w.Write(ln())
}
func rawRootTagName(raw string) string {
raw = strings.TrimSpace(raw)
if strings.HasPrefix(raw, "</") || !strings.HasPrefix(raw, "<") {
return ""
}
end := -1
for i := 1; i < len(raw); i++ {
if raw[i] == ' ' ||
raw[i] == '\t' ||
raw[i] == '\n' ||
raw[i] == '>' {
end = i
break
}
}
if end <= 0 {
return ""
}
return raw[1:end]
}