79 lines
2.3 KiB
TypeScript
79 lines
2.3 KiB
TypeScript
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/**
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* Detects long URLs that span multiple hard-wrapped lines in PTY output.
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*
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* The Linux PTY hard-wraps long lines with \r\n at the terminal column width,
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* which breaks xterm.js WebLinksAddon URL detection. This class reassembles
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* those wrapped URLs and fires a callback for ones >= 100 chars.
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*/
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const ANSI_RE =
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/\x1b(?:\[[0-9;?]*[A-Za-z]|\][^\x07\x1b]*(?:\x07|\x1b\\)?|[()#][A-Za-z0-9]|.)/g;
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const MAX_BUFFER = 8 * 1024; // 8 KB rolling buffer cap
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const DEBOUNCE_MS = 300;
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const MIN_URL_LENGTH = 100;
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export type UrlCallback = (url: string) => void;
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export class UrlDetector {
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private decoder = new TextDecoder();
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private buffer = "";
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private timer: ReturnType<typeof setTimeout> | null = null;
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private lastEmitted = "";
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private callback: UrlCallback;
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constructor(callback: UrlCallback) {
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this.callback = callback;
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}
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/** Feed raw PTY output chunks. */
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feed(data: Uint8Array): void {
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this.buffer += this.decoder.decode(data, { stream: true });
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// Cap buffer to avoid unbounded growth
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if (this.buffer.length > MAX_BUFFER) {
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this.buffer = this.buffer.slice(-MAX_BUFFER);
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}
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// Debounce — scan after 300 ms of silence
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if (this.timer !== null) clearTimeout(this.timer);
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this.timer = setTimeout(() => {
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this.timer = null;
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this.scan();
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}, DEBOUNCE_MS);
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}
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private scan(): void {
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const clean = this.buffer.replace(ANSI_RE, "");
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const lines = clean.replace(/\r\n/g, "\n").replace(/\r/g, "\n").split("\n");
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for (let i = 0; i < lines.length; i++) {
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const match = lines[i].match(/https?:\/\/[^\s'"]+/);
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if (!match) continue;
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// Start with the URL fragment found on this line
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let url = match[0];
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// Concatenate subsequent continuation lines (non-empty, no spaces, no leading whitespace)
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for (let j = i + 1; j < lines.length; j++) {
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const next = lines[j];
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if (!next || next.startsWith(" ") || next.includes(" ")) break;
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url += next;
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i = j; // skip this line in the outer loop
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}
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if (url.length >= MIN_URL_LENGTH && url !== this.lastEmitted) {
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this.lastEmitted = url;
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this.callback(url);
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}
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}
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}
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dispose(): void {
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if (this.timer !== null) {
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clearTimeout(this.timer);
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this.timer = null;
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}
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}
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}
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