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import * as mfm from 'mfm-js';
import { unique } from '@/prelude/array';
// unique without hash
// [ http://a/#1, http://a/#2, http://b/#3 ] => [ http://a/#1, http://b/#3 ]
const removeHash = (x: string) => x.replace(/#[^#]*$/, '');
export function extractUrlFromMfm(nodes: mfm.MfmNode[], respectSilentFlag = true): string[] {
const urlNodes = [] as (mfm.MfmUrl | mfm.MfmLink)[];
function scan(nodes: mfm.MfmNode[]) {
for (const node of nodes) {
if (node.type === 'url') {
urlNodes.push(node);
} else if (node.type === 'link') {
if (!respectSilentFlag || !node.props.silent) {
urlNodes.push(node);
}
} else if (node.children) {
scan(node.children);
}
}
}
scan(nodes);
const urls = unique(urlNodes.map(x => x.props.url));
return urls.reduce((array, url) => {
const removed = removeHash(url);
if (!array.map(x => removeHash(x)).includes(removed)) array.push(url);
return array;
}, [] as string[]);
}
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