43 lines
1.9 KiB
TypeScript
43 lines
1.9 KiB
TypeScript
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import { canRetainIncompleteTerminalControlSequence } from "../terminal/runtime/terminalControlSequenceLimits";
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// eslint-disable-next-line no-control-regex
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const TERMINAL_OSC_SEQUENCE_REGEX = new RegExp("\\u001B\\][^\\u0007\\u001B]*(?:\\u0007|\\u001B\\\\)", "g");
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// eslint-disable-next-line no-control-regex
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const TERMINAL_ESCAPE_SEQUENCE_REGEX = new RegExp("\\u001B(?:[@-Z\\\\-_]|\\[[0-?]*[ -/]*[@-~])", "g");
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// eslint-disable-next-line no-control-regex
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const TERMINAL_CONTROL_CHAR_REGEX = new RegExp("[\\u0000-\\u0008\\u000B-\\u001F\\u007F]", "g");
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// eslint-disable-next-line no-control-regex
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const INCOMPLETE_ESCAPE_TAIL_REGEX = new RegExp("\\u001B(?:\\][^\\u0007\\u001B]*(?:\\u001B)?|\\[[0-?]*[ -/]*)?$");
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const stripTerminalControlSequences = (data: string): string => data
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.replace(TERMINAL_OSC_SEQUENCE_REGEX, "")
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.replace(TERMINAL_ESCAPE_SEQUENCE_REGEX, "")
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.replace(TERMINAL_CONTROL_CHAR_REGEX, "");
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export class ChunkedEscapeFilter {
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private pending = "";
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feed(chunk: string): string {
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const data = this.pending + chunk;
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const tailMatch = INCOMPLETE_ESCAPE_TAIL_REGEX.exec(data);
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if (tailMatch) {
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const incomplete = tailMatch[0];
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if (canRetainIncompleteTerminalControlSequence(incomplete)) {
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this.pending = incomplete;
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return stripTerminalControlSequences(data.slice(0, tailMatch.index));
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}
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// Fail open after the safety budget. This filter is only an activity
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// classifier; retaining an unterminated OSC/DCS forever is worse than
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// treating its payload as visible activity once.
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this.pending = "";
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return `${stripTerminalControlSequences(data.slice(0, tailMatch.index))}${incomplete}`;
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}
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this.pending = "";
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return stripTerminalControlSequences(data);
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}
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}
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export const hasNotifiableTerminalOutput = (filter: ChunkedEscapeFilter, chunk: string): boolean => (
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filter.feed(chunk).trim().length > 0
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);
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