oEmbed

var url = $0 ?? $url;
var maxwidth = $1 ?? $maxwidth;
var maxheight = $2 ?? $maxheight;

if(!#url) {
    "Missing URL";
    return;
}

// fetch embeddable resource definition
var oembed = json.parse(web.text(url & { format: 'json' })) !! nil;
if(oembed is nil) {
    "Unable to read from oEmbed url: ";
    web.link(url);
    return;
}

// determine type of embeddable resource
var embed;
switch(oembed.type) {
case 'photo':
    let embed = <img src=(oembed.url) title=(oembed.title) />;
case 'video':
case 'rich':
    let embed = web.xml(oembed.html);
case 'link':
    "Link oEmbed type is not supported.";
    return;
default:
    "Unrecognized oEmbed type: "; oembed.type;
    return;
}

// check if we were able to construct a result to embed
if(!#embed) {
    "Unable to parse oEmbed";
    return;
}

// embed result
embed;