74 lines
1.4 KiB
TypeScript
74 lines
1.4 KiB
TypeScript
const parse5 = require('parse5');
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export default function(html: string): string {
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if (html == null) return null;
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const dom = parse5.parseFragment(html);
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let text = '';
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dom.childNodes.forEach((n: any) => analyze(n));
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return text.trim();
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function getText(node: any) {
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if (node.nodeName == '#text') return node.value;
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if (node.childNodes) {
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return node.childNodes.map((n: any) => getText(n)).join('');
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}
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return '';
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}
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function analyze(node: any) {
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switch (node.nodeName) {
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case '#text':
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text += node.value;
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break;
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case 'br':
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text += '\n';
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break;
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case 'a':
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const txt = getText(node);
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// メンション
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if (txt.startsWith('@')) {
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const part = txt.split('@');
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if (part.length == 2) {
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//#region ホスト名部分が省略されているので復元する
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const href = new URL(node.attrs.find((x: any) => x.name == 'href').value);
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const acct = txt + '@' + href.hostname;
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text += acct;
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break;
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//#endregion
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} else if (part.length == 3) {
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text += txt;
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break;
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}
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}
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if (node.childNodes) {
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node.childNodes.forEach((n: any) => analyze(n));
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}
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break;
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case 'p':
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text += '\n\n';
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if (node.childNodes) {
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node.childNodes.forEach((n: any) => analyze(n));
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}
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break;
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default:
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if (node.childNodes) {
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node.childNodes.forEach((n: any) => analyze(n));
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}
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break;
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}
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}
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}
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