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markdown.js
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markdown.js
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const markdown = (function () {
"use strict";
const renderer = new md.Renderer();
const options = {
gfm: true,
sanitize: true,
taskLists: true,
renderer: renderer,
linksInNewTab: true,
breaks: true
};
const Loading = "loading";
const Errored = "errored";
const Denied = "denied";
const Missing = "missing";
const Loaded = "loaded";
class Context {
constructor(host) {
this.host = host;
}
createURL(href) {
return this.host + href;
}
open(title, href) {
let context = this;
let url = href;
if (href.startsWith("http://") || href.startsWith("https://")) {
// TODO: this doesn't look right
url = href;
} else {
url = this.createURL(href);
}
return new View(context, title, url);
}
}
class View {
constructor(context, title, url) {
this.context = context;
this.url = url;
this.title = title;
this.status = Loading;
this.stage = null;
this.error = null;
this.content = null;
}
attach(stage) {
this.stage = stage;
this.update();
this.fetch();
}
detach() {
this.stage = null;
// TODO: cancel pending requests
}
fetch() {
let view = this;
fetch(view.url, {
method: "GET"
}).then(response => {
if (response.status == 404) {
view.status = Missing;
view.error = "Page missing";
return;
}
if (response.status != 200) {
view.status = Errored;
view.error = response.statusText;
return;
}
view.status = Loaded;
return response.text().then(content => {
view.content = content;
}).catch(error => {
view.status = Errored;
view.error = error;
});
}).catch(error => {
view.status = Errored;
view.error = error;
}).finally(_ => {
view.update();
});
}
update() {
if (this.stage == null) return;
this.stage.setTag("loading", this.status == Loading);
this.stage.setSlug(h.text(this.url));
let page = h.div("page");
switch (this.status) {
case Loading:
// fallthrough
case Errored:
page.appendChild(h.fragment(
h.h1("", h.text("Error")),
h.p(this.error)
));
break;
case Denied:
page.appendChild(h.fragment(
h.h1("", h.text("Access Denied")),
h.p(this.error)
));
break;
case Missing:
page.appendChild(h.fragment(
h.h1("", h.text("Page missing")),
h.p(this.error)
));
break;
case Loaded:
page.appendChild(this.render());
break;
default:
page.appendChild(h.fragment(
h.h1("", h.text("Unknown status")),
h.p(this.status)
));
break;
}
this.stage.setContent(page);
}
render() {
let view = this;
let mark = h.div("markdown");
mark.innerHTML = md(this.content, options);
let links = mark.getElementsByTagName("a");
for (let i = 0; i < links.length; i++) {
let link = links[i];
link.addEventListener("click", event => {
view.linkClicked(event);
});
link.addEventListener("auxclick", event => {
view.linkClicked(event);
});
};
return mark;
}
linkClicked(ev) {
if (this.stage == null) return;
let target = ev.target;
ev.stopPropagation();
ev.preventDefault();
let slug = target.getAttribute("data-slug");
let url = target.getAttribute("href");
if (slug == null) {
slug = url;
}
let child = this.context.open(target.textContent, slug);
this.stage.open(child, h.isMiddleClick(ev));
}
}
return {
Context: Context,
View: View,
};
})();