Denis H
55 lines
1.7 KiB
TypeScript
55 lines
1.7 KiB
TypeScript
/**
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* Delays an IME/dead-key commit just long enough for xterm to emit onData.
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*
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* xterm is authoritative when it emits the commit. Browsers/layouts where it
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* does not emit onData still forward the compositionend text on the next turn.
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*/
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export function createPtyCompositionForwarder(send: (data: string) => void) {
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let pending: string | null = null;
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let timer: ReturnType<typeof setTimeout> | null = null;
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let matchedTerminalPrefix = "";
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let sawUnrelatedTerminalData = false;
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const clearPending = () => {
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pending = null;
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matchedTerminalPrefix = "";
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sawUnrelatedTerminalData = false;
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if (timer) {
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clearTimeout(timer);
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timer = null;
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}
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};
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return {
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onCompositionEnd(data: string | null) {
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if (!data) return;
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// Preserve rapid consecutive commits instead of discarding the first.
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const previous = pending;
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clearPending();
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if (previous) send(previous);
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pending = data;
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timer = setTimeout(() => {
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const committed = pending;
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clearPending();
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if (committed) send(committed);
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}, 16);
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},
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noteTerminalData(data: string) {
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if (!pending || data.startsWith("\x1b") || sawUnrelatedTerminalData) return;
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// xterm may split committed text across callbacks, but only a clean,
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// leading match is authoritative. Once unrelated data arrives, retain
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// the fallback even if later callbacks happen to spell the composition.
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const observed = matchedTerminalPrefix + data;
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if (observed.startsWith(pending)) {
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clearPending();
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} else if (pending.startsWith(observed)) {
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matchedTerminalPrefix = observed;
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} else {
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sawUnrelatedTerminalData = true;
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}
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},
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dispose: clearPending,
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};
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}
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