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