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reference.go
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reference.go
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package main
import (
"bytes"
"net/url"
"strings"
"github.com/maxence-charriere/go-app/v10/pkg/app"
"github.com/maxence-charriere/go-app/v10/pkg/errors"
"golang.org/x/net/html"
)
const (
getReference = "/reference/get"
referenceState = "/reference"
)
func handleGetReference(ctx app.Context, a app.Action) {
state := referenceState
var ref htmlContent
ctx.GetState(state, &ref)
switch ref.Status {
case loading, loaded:
return
}
ref.Status = loading
ref.Err = nil
ctx.SetState(state, ref)
res, err := get(ctx, "/web/documents/reference.html")
if err != nil {
ref.Status = loadingErr
ref.Err = errors.New("getting reference failed").Wrap(err)
ctx.SetState(state, ref)
return
}
doc, err := html.Parse(bytes.NewReader(res))
if err != nil {
ref.Status = loadingErr
ref.Err = errors.New("parsing reference failed").Wrap(err)
ctx.SetState(state, ref)
return
}
content, err := getHTML(doc, "#page")
if err != nil {
ref.Status = loadingErr
ref.Err = errors.New("generating reference content failed").Wrap(err)
ctx.SetState(state, ref)
return
}
content = strings.ReplaceAll(content, "▾", "")
content = strings.ReplaceAll(content, `title="Click to hide Overview section"`, "")
content = strings.ReplaceAll(content, `title="Click to hide Index section"`, "")
content = strings.ReplaceAll(content, "/src/github.com/maxence-charriere/go-app/v10/", "https://github.com/maxence-charriere/go-app/blob/master/")
index, err := getHTML(doc, "#manual-nav")
if err != nil {
ref.Status = loadingErr
ref.Err = errors.New("generating reference content failed").Wrap(err)
ctx.SetState(state, ref)
return
}
ref.Content = content
ref.Index = index
ref.Status = loaded
ctx.SetState(state, ref)
}
type htmlContent struct {
Status status
Err error
Index string
Content string
}
func getHTML(n *html.Node, class string) (string, error) {
section, err := findHTMLNode(n, class)
if err != nil {
return "", errors.New("finding html node failed").
WithTag("target", class).
Wrap(err)
}
normalizeHTMLNode(section)
var b bytes.Buffer
if err := html.Render(&b, section); err != nil {
return "", errors.New("rendering html failed").
WithTag("target", class).
Wrap(err)
}
return b.String(), nil
}
func findHTMLNode(n *html.Node, sel string) (*html.Node, error) {
if n.Type == html.ElementNode {
for _, a := range n.Attr {
switch {
case a.Key == "class" && a.Val == strings.TrimPrefix(sel, "."):
return n, nil
case a.Key == "id" && a.Val == strings.TrimPrefix(sel, "#"):
return n, nil
}
}
}
for c := n.FirstChild; c != nil; c = c.NextSibling {
if child, err := findHTMLNode(c, sel); err == nil {
return child, nil
}
}
return nil, errors.New("node not found")
}
func normalizeHTMLNode(n *html.Node) {
if n.Type == html.ElementNode {
var id string
for i, a := range n.Attr {
if a.Key != "href" {
continue
}
u, err := url.Parse(a.Val)
if err != nil {
continue
}
switch {
case strings.HasPrefix(u.Path, "/builtin"):
u.Scheme = "https"
u.Host = "pkg.go.dev"
case u.Scheme == "" && u.Fragment != "":
id = refLinkID(u.Fragment)
}
a.Val = u.String()
n.Attr[i] = a
break
}
if id != "" {
n.Attr = append(n.Attr, html.Attribute{
Key: "id",
Val: id,
})
}
}
for c := n.FirstChild; c != nil; c = c.NextSibling {
normalizeHTMLNode(c)
}
}
func refLinkID(v string) string {
return "ref-link-" + v
}