tildefriends/apps/ssb/tf-utils.js

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import * as hashtagify from './commonmark-hashtag.js';
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const k_code_classes = 'w3-theme-l4 w3-theme-border w3-round';
var reUnsafeProtocol = /^javascript:|vbscript:|file:|data:/i;
var reSafeDataProtocol = /^data:image\/(?:png|gif|jpeg|webp)/i;
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var potentiallyUnsafe = function (url) {
return reUnsafeProtocol.test(url) && !reSafeDataProtocol.test(url);
};
function image(node, entering) {
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if (
node.firstChild?.type === 'text' &&
node.firstChild.literal.startsWith('video:')
) {
if (entering) {
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this.lit(
'<video style="max-width: 100%; max-height: 480px" title="' +
this.esc(node.firstChild?.literal) +
'" controls>'
);
this.lit('<source src="' + this.esc(node.destination) + '"></source>');
this.disableTags += 1;
} else {
this.disableTags -= 1;
this.lit('</video>');
}
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} else if (
node.firstChild?.type === 'text' &&
node.firstChild.literal.startsWith('audio:')
) {
if (entering) {
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this.lit(
'<audio style="height: 32px; max-width: 100%" title="' +
this.esc(node.firstChild?.literal) +
'" controls>'
);
this.lit('<source src="' + this.esc(node.destination) + '"></source>');
this.disableTags += 1;
} else {
this.disableTags -= 1;
this.lit('</audio>');
}
} else {
if (entering) {
if (this.disableTags === 0) {
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this.lit(
'<div class="img_caption">' +
this.esc(node.firstChild?.literal || node.destination) +
'</div>'
);
if (this.options.safe && potentiallyUnsafe(node.destination)) {
this.lit('<img src="" alt="');
} else {
this.lit('<img src="' + this.esc(node.destination) + '" alt="');
}
}
this.disableTags += 1;
} else {
this.disableTags -= 1;
if (this.disableTags === 0) {
if (node.title) {
this.lit('" title="' + this.esc(node.title));
}
this.lit('" />');
}
}
}
}
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function code(node) {
let attrs = this.attrs(node);
attrs.push(['class', k_code_classes]);
this.tag('code', attrs);
this.out(node.literal);
this.tag('/code');
}
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function attrs(node) {
let result = commonmark.HtmlRenderer.prototype.attrs.bind(this)(node);
if (node.type == 'block_quote') {
result.push(['class', 'w3-theme-d1']);
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} else if (node.type == 'code_block') {
result.push(['class', k_code_classes]);
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}
return result;
}
export function markdown(md) {
let reader = new commonmark.Parser();
let writer = new commonmark.HtmlRenderer({safe: true});
writer.image = image;
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writer.code = code;
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writer.attrs = attrs;
let parsed = reader.parse(md || '');
parsed = hashtagify.transform(parsed);
let walker = parsed.walker();
let event, node;
while ((event = walker.next())) {
node = event.node;
if (event.entering) {
if (node.type == 'link') {
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if (
node.destination.startsWith('@') &&
node.destination.endsWith('.ed25519')
) {
node.destination = '#' + node.destination;
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} else if (
node.destination.startsWith('%') &&
node.destination.endsWith('.sha256')
) {
node.destination = '#' + node.destination;
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} else if (
node.destination.startsWith('&') &&
node.destination.endsWith('.sha256')
) {
node.destination = '/' + node.destination + '/view';
}
} else if (node.type == 'image') {
if (node.destination.startsWith('&')) {
node.destination = '/' + node.destination + '/view';
}
}
}
}
return writer.render(parsed);
}
export function human_readable_size(bytes) {
let v = bytes;
let u = 'B';
for (let unit of ['kB', 'MB', 'GB']) {
if (v > 1024) {
v /= 1024;
u = unit;
} else {
break;
}
}
return `${Math.round(v * 10) / 10} ${u}`;
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}