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66 lines
2.9 KiB
Plaintext
66 lines
2.9 KiB
Plaintext
export interface AnnouncementSpan { text: string; url: string; }
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// Same restricted plain-text/link grammar as Android AnnouncementText.java.
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export function isAnnouncementURL(address: string): boolean {
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return !/[\x00-\x20\x7f\\<>\"]/.test(address) &&
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/^https?:\/\/(?:[^\/?#]*@)?(?:\[[0-9a-f:.]+\]|[^\/?#:@\[\]]+)(?::[0-9]+)?(?:[\/?#]|$)/i.test(address);
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}
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function hasScheme(text: string, start: number): boolean {
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return /^https?:\/\//i.test(text.substring(start, start + 8));
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}
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function urlEnd(text: string, start: number): number {
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let parentheses = 0, brackets = 0, end = start;
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for (; end < text.length; end++) {
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const c = text.charAt(end);
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if (c.charCodeAt(0) <= 0x20 || c.charCodeAt(0) === 0x7f || c === '\\' || c === '`' ||
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'<>\"\'{}，。；：！？、（）【】《》「」『』“”‘’'.includes(c)) break;
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if (c === '(') parentheses++;
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if (c === ')') { if (parentheses === 0) break; parentheses--; }
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if (c === '[') brackets++;
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if (c === ']') { if (brackets === 0) break; brackets--; }
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}
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return end;
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}
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export function announcementSpans(body: string): AnnouncementSpan[] {
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const text = body.replace(/\r\n/g, '\n'), result: AnnouncementSpan[] = [];
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let plain = '';
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for (let position = 0; position < text.length;) {
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let label = '', address = '', next = position;
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if (text.charAt(position) === '[') {
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const labelEnd = text.indexOf(']', position + 1), start = labelEnd + 2;
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if (labelEnd > position + 1 && start < text.length && text.charAt(labelEnd + 1) === '(' &&
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!/[\[\]\r\n]/.test(text.substring(position + 1, labelEnd)) && hasScheme(text, start)) {
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const end = urlEnd(text, start), url = text.substring(start, end);
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if (text.charAt(end) === ')' && isAnnouncementURL(url)) {
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label = text.substring(position + 1, labelEnd); address = url; next = end + 1;
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}
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}
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}
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if (!address && hasScheme(text, position)) {
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let end = urlEnd(text, position);
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while (end > position && '.,;:!?'.includes(text.charAt(end - 1))) end--;
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const url = text.substring(position, end);
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if (isAnnouncementURL(url)) { label = address = url; next = end; }
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}
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if (address) {
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if (plain) { result.push({ text: plain, url: '' }); plain = ''; }
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result.push({ text: label, url: address }); position = next;
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} else plain += text.charAt(position++);
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}
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if (plain) result.push({ text: plain, url: '' });
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return result;
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}
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export function announcementByteLength(text: string): number {
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let bytes = 0;
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for (let i = 0; i < text.length; i++) {
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const c = text.charCodeAt(i);
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if (c < 0x80) bytes++;
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else if (c < 0x800) bytes += 2;
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else if (c >= 0xd800 && c <= 0xdbff && i + 1 < text.length &&
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text.charCodeAt(i + 1) >= 0xdc00 && text.charCodeAt(i + 1) <= 0xdfff) { bytes += 4; i++; }
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else bytes += c >= 0xd800 && c <= 0xdfff ? 1 : 3; // Java UTF-8 replaces lone surrogates with '?'.
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}
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return bytes;
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}
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