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import { URL } from 'node:url';
import * as parse5 from 'parse5';
import * as TreeAdapter from '../../node_modules/parse5/dist/tree-adapters/default.js';
const treeAdapter = TreeAdapter.defaultTreeAdapter;
const urlRegex = /^https?:\/\/[\w\/:%#@$&?!()\[\]~.,=+\-]+/;
const urlRegexFull = /^https?:\/\/[\w\/:%#@$&?!()\[\]~.,=+\-]+$/;
export function fromHtml(html: string, hashtagNames?: string[]): string {
// some AP servers like Pixelfed use br tags as well as newlines
html = html.replace(/<br\s?\/?>\r?\n/gi, '\n');
const dom = parse5.parseFragment(html);
let text = '';
for (const n of dom.childNodes) {
analyze(n);
}
return text.trim();
function getText(node: TreeAdapter.Node): string {
if (treeAdapter.isTextNode(node)) return node.value;
if (!treeAdapter.isElementNode(node)) return '';
if (node.nodeName === 'br') return '\n';
if (node.childNodes) {
return node.childNodes.map(n => getText(n)).join('');
}
return '';
}
function appendChildren(childNodes: TreeAdapter.ChildNode[]): void {
if (childNodes) {
for (const n of childNodes) {
analyze(n);
}
}
}
function analyze(node: TreeAdapter.Node) {
if (treeAdapter.isTextNode(node)) {
text += node.value;
return;
}
// Skip comment or document type node
if (!treeAdapter.isElementNode(node)) return;
switch (node.nodeName) {
case 'br': {
text += '\n';
break;
}
case 'a':
{
const txt = getText(node);
const rel = node.attrs.find(x => x.name === 'rel');
const href = node.attrs.find(x => x.name === 'href');
// ハッシュタグ
if (hashtagNames && href && hashtagNames.map(x => x.toLowerCase()).includes(txt.toLowerCase())) {
text += txt;
// メンション
} else if (txt.startsWith('@') && !(rel && rel.value.match(/^me /))) {
const part = txt.split('@');
if (part.length === 2 && href) {
//#region ホスト名部分が省略されているので復元する
const acct = `${txt}@${(new URL(href.value)).hostname}`;
text += acct;
//#endregion
} else if (part.length === 3) {
text += txt;
}
// その他
} else {
const generateLink = () => {
if (!href && !txt) {
return '';
}
if (!href) {
return txt;
}
if (!txt || txt === href.value) { // #6383: Missing text node
if (href.value.match(urlRegexFull)) {
return href.value;
} else {
return `<${href.value}>`;
}
}
if (href.value.match(urlRegex) && !href.value.match(urlRegexFull)) {
return `[${txt}](<${href.value}>)`; // #6846
} else {
return `[${txt}](${href.value})`;
}
};
text += generateLink();
}
break;
}
case 'h1':
{
text += '【';
appendChildren(node.childNodes);
text += '】\n';
break;
}
case 'b':
case 'strong':
{
text += '**';
appendChildren(node.childNodes);
text += '**';
break;
}
case 'small':
{
text += '<small>';
appendChildren(node.childNodes);
text += '</small>';
break;
}
case 's':
case 'del':
{
text += '~~';
appendChildren(node.childNodes);
text += '~~';
break;
}
case 'i':
case 'em':
{
text += '<i>';
appendChildren(node.childNodes);
text += '</i>';
break;
}
// block code (<pre><code>)
case 'pre': {
if (node.childNodes.length === 1 && node.childNodes[0].nodeName === 'code') {
text += '\n```\n';
text += getText(node.childNodes[0]);
text += '\n```\n';
} else {
appendChildren(node.childNodes);
}
break;
}
// inline code (<code>)
case 'code': {
text += '`';
appendChildren(node.childNodes);
text += '`';
break;
}
case 'blockquote': {
const t = getText(node);
if (t) {
text += '\n> ';
text += t.split('\n').join('\n> ');
}
break;
}
case 'p':
case 'h2':
case 'h3':
case 'h4':
case 'h5':
case 'h6':
{
text += '\n\n';
appendChildren(node.childNodes);
break;
}
// other block elements
case 'div':
case 'header':
case 'footer':
case 'article':
case 'li':
case 'dt':
case 'dd':
{
text += '\n';
appendChildren(node.childNodes);
break;
}
default: // includes inline elements
{
appendChildren(node.childNodes);
break;
}
}
}
}
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