75 lines
2.3 KiB
JavaScript
75 lines
2.3 KiB
JavaScript
export function escapeHtml(text) {
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return text
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.replace(/&/g, '&')
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.replace(/</g, '<')
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.replace(/>/g, '>')
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.replace(/"/g, '"')
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.replace(/'/g, ''');
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}
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function inlineToHtml(text) {
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let html = escapeHtml(text);
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html = html.replace(/`([^`\n]+)`/g, '<code>$1</code>');
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html = html.replace(/\*\*([^*\n]+)\*\*/g, '<b>$1</b>');
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return html;
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}
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/** Convert `> …` line groups into `<blockquote>` (Telegram renders it with the accent-colored left bar). */
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function blocksToHtml(text) {
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const lines = text.split('\n');
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const out = [];
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let quote = [];
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const flush = () => {
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if (quote.length === 0)
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return;
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out.push(`<blockquote>${inlineToHtml(quote.join('\n'))}</blockquote>`);
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quote = [];
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};
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for (const line of lines) {
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if (line.startsWith('> '))
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quote.push(line.slice(2));
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else if (line === '>')
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quote.push('');
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else {
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flush();
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out.push(inlineToHtml(line));
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}
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}
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flush();
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return out.join('\n');
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}
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export function markdownToHtml(text) {
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const parts = text.split(/```[\w-]*/);
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if (parts.length % 2 === 0)
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return inlineToHtml(text);
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let html = '';
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for (let i = 0; i < parts.length; i++) {
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if (i % 2 === 1) {
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const code = parts[i].replace(/^\n/, '').replace(/\n$/, '');
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html += `<pre>${escapeHtml(code)}</pre>`;
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}
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else {
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html += blocksToHtml(parts[i]);
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}
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}
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return html;
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}
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export function splitMessage(text, maxLength) {
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if (maxLength < 1)
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throw new Error('maxLength must be >= 1');
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if (text.length <= maxLength)
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return [text];
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const chunks = [];
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let rest = text;
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while (rest.length > maxLength) {
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const window = rest.slice(0, maxLength);
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const newline = window.lastIndexOf('\n');
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const ideographic = window.lastIndexOf('。');
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const sentence = window.lastIndexOf('. ');
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const breakAt = Math.max(newline, ideographic, sentence);
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const cut = breakAt > 0 ? (breakAt === sentence ? breakAt + 2 : breakAt + 1) : maxLength;
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chunks.push(rest.slice(0, cut));
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rest = rest.slice(cut);
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}
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chunks.push(rest);
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return chunks;
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}
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