45 lines
1.8 KiB
TypeScript
45 lines
1.8 KiB
TypeScript
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/**
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* Strict bastion prompts (e.g. QAX/奇安信) treat one SSH channel write as a
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* single keystroke and silently drop every multi-character chunk (#3077). IME
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* commits and short raw pastes therefore have to leave the renderer as
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* per-character writes, which is what typing produces and what Xshell does.
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*/
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/** Raw pastes longer than this keep the single-write behavior. */
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export const MAX_RAW_PASTE_PER_CHARACTER_LENGTH = 32;
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const ESC = "\x1b";
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/** True while the payload only carries plain text and no escape sequence. */
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export const isPlainTerminalInputText = (data: string): boolean => !data.includes(ESC);
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/** One chunk per Unicode code point so surrogate pairs stay intact. */
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export const splitTextIntoCodePointWrites = (data: string): string[] => Array.from(data);
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/** IME commits: any plain text with more than one character splits per glyph. */
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export const shouldSplitImeTextInputForWire = (text: string): boolean =>
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Array.from(text).length > 1 && isPlainTerminalInputText(text);
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/**
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* Raw (non-bracketed) paste: short plain text goes out as keystrokes, longer
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* pastes keep the single write so bulk pastes do not degrade.
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*/
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export const shouldSplitRawPasteInputForWire = (data: string): boolean => {
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if (data.length <= 1 || !isPlainTerminalInputText(data)) return false;
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let codePoints = 0;
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for (let index = 0; index < data.length; ) {
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index += (data.codePointAt(index) ?? 0) > 0xffff ? 2 : 1;
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codePoints += 1;
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if (codePoints > MAX_RAW_PASTE_PER_CHARACTER_LENGTH) return false;
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}
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return true;
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};
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/** Chunks to write for one input payload; escape sequences are never split. */
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export const getTextInputWireChunks = (
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data: string,
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perCharacterWrites: boolean,
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): string[] =>
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perCharacterWrites && isPlainTerminalInputText(data)
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? splitTextIntoCodePointWrites(data)
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: [data];
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