| 1 | //! Paste-burst detection for terminals without reliable bracketed paste. |
| 2 | |
| 3 | use std::time::{Duration, Instant}; |
| 4 | |
| 5 | const PASTE_BURST_MIN_CHARS: u16 = 3; |
| 6 | const PASTE_BURST_CHAR_INTERVAL: Duration = Duration::from_millis(8); |
| 7 | const PASTE_ENTER_SUPPRESS_WINDOW: Duration = Duration::from_millis(120); |
| 8 | #[cfg(not(windows))] |
| 9 | const PASTE_BURST_ACTIVE_IDLE_TIMEOUT: Duration = Duration::from_millis(8); |
| 10 | #[cfg(windows)] |
| 11 | const PASTE_BURST_ACTIVE_IDLE_TIMEOUT: Duration = Duration::from_millis(60); |
| 12 | |
| 13 | #[derive(Default)] |
| 14 | pub(crate) struct PasteBurst { |
| 15 | last_plain_char_time: Option<Instant>, |
| 16 | consecutive_plain_char_burst: u16, |
| 17 | burst_window_until: Option<Instant>, |
| 18 | buffer: String, |
| 19 | active: bool, |
| 20 | pending_first_char: Option<(char, Instant)>, |
| 21 | } |
| 22 | |
| 23 | pub(crate) enum CharDecision { |
| 24 | BeginBuffer, |
| 25 | BufferAppend, |
| 26 | RetainFirstChar, |
| 27 | BeginBufferFromPending, |
| 28 | } |
| 29 | |
| 30 | pub(crate) enum FlushResult { |
| 31 | Paste(String), |
| 32 | Typed(char), |
| 33 | /// Enter can submit again even though the composer text has not changed. |
| 34 | SuppressionExpired, |
| 35 | None, |
| 36 | } |
| 37 | |
| 38 | impl PasteBurst { |
| 39 | #[cfg(test)] |
| 40 | pub fn recommended_flush_delay() -> Duration { |
| 41 | PASTE_BURST_CHAR_INTERVAL + Duration::from_millis(1) |
| 42 | } |
| 43 | |
| 44 | #[cfg(test)] |
| 45 | pub(crate) fn recommended_active_flush_delay() -> Duration { |
| 46 | PASTE_BURST_ACTIVE_IDLE_TIMEOUT + Duration::from_millis(1) |
| 47 | } |
| 48 | |
| 49 | pub fn on_plain_char(&mut self, ch: char, now: Instant) -> CharDecision { |
| 50 | self.note_plain_char(now); |
| 51 | |
| 52 | if self.active { |
| 53 | self.burst_window_until = Some(now + PASTE_ENTER_SUPPRESS_WINDOW); |
| 54 | return CharDecision::BufferAppend; |
| 55 | } |
| 56 | |
| 57 | if let Some((held, held_at)) = self.pending_first_char |
| 58 | && now.duration_since(held_at) <= PASTE_BURST_CHAR_INTERVAL |
| 59 | { |
| 60 | self.active = true; |
| 61 | let _ = self.pending_first_char.take(); |
| 62 | self.buffer.push(held); |
| 63 | self.burst_window_until = Some(now + PASTE_ENTER_SUPPRESS_WINDOW); |
| 64 | return CharDecision::BeginBufferFromPending; |
| 65 | } |
| 66 | |
| 67 | if self.consecutive_plain_char_burst >= PASTE_BURST_MIN_CHARS { |
| 68 | return CharDecision::BeginBuffer; |
| 69 | } |
| 70 | |
| 71 | self.pending_first_char = Some((ch, now)); |
| 72 | CharDecision::RetainFirstChar |
| 73 | } |
| 74 | |
| 75 | pub(crate) fn note_plain_char(&mut self, now: Instant) -> u16 { |
| 76 | match self.last_plain_char_time { |
| 77 | Some(prev) if now.duration_since(prev) <= PASTE_BURST_CHAR_INTERVAL => { |
| 78 | self.consecutive_plain_char_burst = |
| 79 | self.consecutive_plain_char_burst.saturating_add(1); |
| 80 | } |
| 81 | _ => self.consecutive_plain_char_burst = 1, |
| 82 | } |
| 83 | self.last_plain_char_time = Some(now); |
| 84 | self.consecutive_plain_char_burst |
| 85 | } |
| 86 | |
| 87 | pub fn flush_if_due(&mut self, now: Instant) -> FlushResult { |
| 88 | let suppression_expired = self.burst_window_until.is_some_and(|until| now > until); |
| 89 | if suppression_expired { |
| 90 | self.burst_window_until = None; |
| 91 | } |
| 92 | let unchanged = if suppression_expired { |
| 93 | FlushResult::SuppressionExpired |
| 94 | } else { |
| 95 | FlushResult::None |
| 96 | }; |
| 97 | let timeout = if self.is_active_internal() { |
| 98 | PASTE_BURST_ACTIVE_IDLE_TIMEOUT |
| 99 | } else { |
| 100 | PASTE_BURST_CHAR_INTERVAL |
| 101 | }; |
| 102 | let timed_out = self |
| 103 | .last_plain_char_time |
| 104 | .is_some_and(|t| now.duration_since(t) > timeout); |
| 105 | |
| 106 | if timed_out && self.is_active_internal() { |
| 107 | self.active = false; |
| 108 | let out = std::mem::take(&mut self.buffer); |
| 109 | // `burst_window_until` intentionally survives the flush: the idle |
| 110 | // timeout is only 8ms, and a paste's trailing newline can land |
| 111 | // just after it over a laggy link (SSH/tmux). Dropping the window |
| 112 | // here would let that pasted newline submit a partial paste |
| 113 | // (#1073). The window stays *bounded* instead: absorbing an Enter |
| 114 | // outside an active burst no longer re-arms it, so suppression |
| 115 | // always ends `PASTE_ENTER_SUPPRESS_WINDOW` after the last real |
| 116 | // keystroke. |
| 117 | FlushResult::Paste(out) |
| 118 | } else if timed_out { |
| 119 | if let Some((ch, _)) = self.pending_first_char.take() { |
| 120 | FlushResult::Typed(ch) |
| 121 | } else { |
| 122 | unchanged |
| 123 | } |
| 124 | } else { |
| 125 | unchanged |
| 126 | } |
| 127 | } |
| 128 | |
| 129 | /// Wake for pending input or the one redraw that re-enables submission. |
| 130 | /// Once both are settled, typing must not leave a zero-delay poll loop. |
| 131 | #[must_use] |
| 132 | pub fn next_flush_delay(&self, now: Instant) -> Option<Duration> { |
| 133 | if self.is_active() { |
| 134 | let last = self.last_plain_char_time?; |
| 135 | let timeout = if self.is_active_internal() { |
| 136 | PASTE_BURST_ACTIVE_IDLE_TIMEOUT |
| 137 | } else { |
| 138 | PASTE_BURST_CHAR_INTERVAL |
| 139 | }; |
| 140 | return Some(timeout.saturating_sub(now.duration_since(last))); |
| 141 | } |
| 142 | self.burst_window_until |
| 143 | .map(|until| (until + Duration::from_millis(1)).saturating_duration_since(now)) |
| 144 | } |
| 145 | |
| 146 | pub fn append_newline_if_active(&mut self, now: Instant) -> bool { |
| 147 | if self.is_active() { |
| 148 | // A held first char precedes this newline in arrival order; move |
| 149 | // it into the burst first or it would land after the newline |
| 150 | // ("a\nb" became "\nab"). |
| 151 | if let Some((held, _)) = self.pending_first_char.take() { |
| 152 | self.buffer.push(held); |
| 153 | self.active = true; |
| 154 | } |
| 155 | self.buffer.push('\n'); |
| 156 | self.burst_window_until = Some(now + PASTE_ENTER_SUPPRESS_WINDOW); |
| 157 | true |
| 158 | } else { |
| 159 | false |
| 160 | } |
| 161 | } |
| 162 | |
| 163 | pub fn newline_should_insert_instead_of_submit(&self, now: Instant) -> bool { |
| 164 | let in_burst_window = self.burst_window_until.is_some_and(|until| now <= until); |
| 165 | self.is_active() || in_burst_window |
| 166 | } |
| 167 | |
| 168 | pub fn extend_window(&mut self, now: Instant) { |
| 169 | self.burst_window_until = Some(now + PASTE_ENTER_SUPPRESS_WINDOW); |
| 170 | } |
| 171 | |
| 172 | /// Begin buffering from the current char, leaving already-typed text |
| 173 | /// untouched. The burst never rewrites the composer (Y-7): chars before |
| 174 | /// the burst stay exactly as the user typed them. |
| 175 | pub fn begin_buffer_from_now(&mut self, ch: char, now: Instant) { |
| 176 | self.buffer.push(ch); |
| 177 | self.active = true; |
| 178 | self.burst_window_until = Some(now + PASTE_ENTER_SUPPRESS_WINDOW); |
| 179 | } |
| 180 | |
| 181 | /// The text the heuristic currently holds on the user's behalf: the |
| 182 | /// held first char plus the burst buffer, in arrival order. Command |
| 183 | /// context must be judged on this — while a burst is held the composer |
| 184 | /// can be empty even though the user is mid-command (Y-7). |
| 185 | pub fn held_text(&self) -> String { |
| 186 | let mut out = String::new(); |
| 187 | if let Some((ch, _)) = self.pending_first_char { |
| 188 | out.push(ch); |
| 189 | } |
| 190 | out.push_str(&self.buffer); |
| 191 | out |
| 192 | } |
| 193 | |
| 194 | pub fn append_char_to_buffer(&mut self, ch: char, now: Instant) { |
| 195 | self.buffer.push(ch); |
| 196 | self.burst_window_until = Some(now + PASTE_ENTER_SUPPRESS_WINDOW); |
| 197 | } |
| 198 | |
| 199 | pub fn flush_before_modified_input(&mut self) -> Option<String> { |
| 200 | if !self.is_active() { |
| 201 | return None; |
| 202 | } |
| 203 | self.active = false; |
| 204 | let mut out = std::mem::take(&mut self.buffer); |
| 205 | if let Some((ch, _)) = self.pending_first_char.take() { |
| 206 | out.push(ch); |
| 207 | } |
| 208 | Some(out) |
| 209 | } |
| 210 | |
| 211 | /// Reset burst-accumulation state without clearing the suppression window. |
| 212 | /// |
| 213 | /// Used when a non-char key (Tab, etc.) arrives during an active burst as |
| 214 | /// part of table-data paste. The buffer was flushed upstream; only the |
| 215 | /// active state is reset so `burst_window_until` stays alive and a trailing |
| 216 | /// Enter is still absorbed as a newline (#2134). |
| 217 | /// |
| 218 | /// # Panics |
| 219 | /// |
| 220 | /// Panics in debug builds if `buffer` is non-empty — the caller must flush |
| 221 | /// via `flush_before_modified_input` first. |
| 222 | pub fn deactivate_keep_window(&mut self) { |
| 223 | debug_assert!( |
| 224 | self.buffer.is_empty(), |
| 225 | "buffer must be flushed before deactivating" |
| 226 | ); |
| 227 | self.consecutive_plain_char_burst = 0; |
| 228 | self.last_plain_char_time = None; |
| 229 | self.active = false; |
| 230 | self.pending_first_char = None; |
| 231 | // burst_window_until intentionally NOT cleared |
| 232 | } |
| 233 | |
| 234 | pub fn is_active(&self) -> bool { |
| 235 | self.is_active_internal() || self.pending_first_char.is_some() |
| 236 | } |
| 237 | |
| 238 | fn is_active_internal(&self) -> bool { |
| 239 | self.active || !self.buffer.is_empty() |
| 240 | } |
| 241 | |
| 242 | pub fn clear_after_explicit_paste(&mut self) { |
| 243 | self.last_plain_char_time = None; |
| 244 | self.consecutive_plain_char_burst = 0; |
| 245 | self.burst_window_until = None; |
| 246 | self.active = false; |
| 247 | self.buffer.clear(); |
| 248 | self.pending_first_char = None; |
| 249 | } |
| 250 | |
| 251 | /// Arm the Enter-suppression window for a non-ASCII character that was |
| 252 | /// inserted straight into the composer instead of being buffered (the |
| 253 | /// IME / raw-CJK path in `tui::paste`). |
| 254 | /// |
| 255 | /// `rapid_chars` is the run length reported by [`Self::note_plain_char`]. |
| 256 | /// |
| 257 | /// A *lone* commit only earns a burst-interval window. An IME candidate |
| 258 | /// commit is ordinary typing: the user may press Enter to send a |
| 259 | /// message ending in a CJK character tens of milliseconds later, and the |
| 260 | /// full 120ms window turned that Enter into a stray newline. A real raw |
| 261 | /// paste delivers its trailing newline within microseconds of the last |
| 262 | /// character, so the short window still absorbs it — including the |
| 263 | /// single-character first line of a CJK paste (#1302). |
| 264 | /// |
| 265 | /// Two or more characters at paste speed mean the stream *is* a paste, |
| 266 | /// so the full window applies and later lines stay absorbed. |
| 267 | pub fn arm_window_for_direct_char(&mut self, now: Instant, rapid_chars: u16) { |
| 268 | if rapid_chars >= 2 { |
| 269 | self.extend_window(now); |
| 270 | } else { |
| 271 | self.burst_window_until = Some(now + PASTE_BURST_CHAR_INTERVAL); |
| 272 | } |
| 273 | } |
| 274 | } |
| 275 | |
| 276 | #[cfg(test)] |
| 277 | mod tests { |
| 278 | use super::*; |
| 279 | |
| 280 | #[test] |
| 281 | fn ascii_first_char_is_held_then_flushes_as_typed() { |
| 282 | let mut burst = PasteBurst::default(); |
| 283 | let t0 = Instant::now(); |
| 284 | assert!(matches!( |
| 285 | burst.on_plain_char('a', t0), |
| 286 | CharDecision::RetainFirstChar |
| 287 | )); |
| 288 | |
| 289 | let t1 = t0 + PasteBurst::recommended_flush_delay() + Duration::from_millis(1); |
| 290 | assert!(matches!(burst.flush_if_due(t1), FlushResult::Typed('a'))); |
| 291 | assert!(!burst.is_active()); |
| 292 | } |
| 293 | |
| 294 | #[test] |
| 295 | fn ascii_two_fast_chars_start_buffer_from_pending_and_flush_as_paste() { |
| 296 | let mut burst = PasteBurst::default(); |
| 297 | let t0 = Instant::now(); |
| 298 | assert!(matches!( |
| 299 | burst.on_plain_char('a', t0), |
| 300 | CharDecision::RetainFirstChar |
| 301 | )); |
| 302 | |
| 303 | let t1 = t0 + Duration::from_millis(1); |
| 304 | assert!(matches!( |
| 305 | burst.on_plain_char('b', t1), |
| 306 | CharDecision::BeginBufferFromPending |
| 307 | )); |
| 308 | burst.append_char_to_buffer('b', t1); |
| 309 | |
| 310 | let t2 = t1 + PasteBurst::recommended_active_flush_delay() + Duration::from_millis(1); |
| 311 | assert!(matches!( |
| 312 | burst.flush_if_due(t2), |
| 313 | FlushResult::Paste(ref s) if s == "ab" |
| 314 | )); |
| 315 | } |
| 316 | |
| 317 | #[test] |
| 318 | fn newline_after_held_first_char_keeps_arrival_order() { |
| 319 | let mut burst = PasteBurst::default(); |
| 320 | let t0 = Instant::now(); |
| 321 | assert!(matches!( |
| 322 | burst.on_plain_char('1', t0), |
| 323 | CharDecision::RetainFirstChar |
| 324 | )); |
| 325 | let t1 = t0 + Duration::from_millis(1); |
| 326 | assert!(burst.append_newline_if_active(t1)); |
| 327 | let t2 = t1 + Duration::from_millis(1); |
| 328 | let decision = burst.on_plain_char('2', t2); |
| 329 | assert!(matches!( |
| 330 | decision, |
| 331 | CharDecision::BufferAppend | CharDecision::BeginBufferFromPending |
| 332 | )); |
| 333 | burst.append_char_to_buffer('2', t2); |
| 334 | let t3 = t2 + PasteBurst::recommended_active_flush_delay() + Duration::from_millis(1); |
| 335 | assert!(matches!( |
| 336 | burst.flush_if_due(t3), |
| 337 | FlushResult::Paste(ref s) if s == "1\n2" |
| 338 | )); |
| 339 | } |
| 340 | |
| 341 | #[test] |
| 342 | fn flush_before_modified_input_includes_pending_first_char() { |
| 343 | let mut burst = PasteBurst::default(); |
| 344 | let t0 = Instant::now(); |
| 345 | assert!(matches!( |
| 346 | burst.on_plain_char('a', t0), |
| 347 | CharDecision::RetainFirstChar |
| 348 | )); |
| 349 | |
| 350 | assert_eq!(burst.flush_before_modified_input(), Some("a".to_string())); |
| 351 | assert!(!burst.is_active()); |
| 352 | } |
| 353 | |
| 354 | #[test] |
| 355 | fn settled_input_stops_polling_and_expiry_requests_one_redraw() { |
| 356 | let mut burst = PasteBurst::default(); |
| 357 | let now = Instant::now(); |
| 358 | let _ = burst.on_plain_char('a', now); |
| 359 | assert!(matches!( |
| 360 | burst.flush_if_due(now + Duration::from_millis(20)), |
| 361 | FlushResult::Typed('a') |
| 362 | )); |
| 363 | assert_eq!( |
| 364 | burst.next_flush_delay(now + Duration::from_millis(20)), |
| 365 | None |
| 366 | ); |
| 367 | |
| 368 | burst.extend_window(now); |
| 369 | let inside = now + Duration::from_millis(100); |
| 370 | assert!(burst.newline_should_insert_instead_of_submit(inside)); |
| 371 | assert_eq!( |
| 372 | burst.next_flush_delay(inside), |
| 373 | Some(Duration::from_millis(21)) |
| 374 | ); |
| 375 | let expired = now + Duration::from_millis(121); |
| 376 | assert!(matches!( |
| 377 | burst.flush_if_due(expired), |
| 378 | FlushResult::SuppressionExpired |
| 379 | )); |
| 380 | assert!(!burst.newline_should_insert_instead_of_submit(expired)); |
| 381 | assert_eq!(burst.next_flush_delay(expired), None); |
| 382 | assert!(matches!(burst.flush_if_due(expired), FlushResult::None)); |
| 383 | } |
| 384 | |
| 385 | #[test] |
| 386 | fn next_flush_delay_counts_down_to_zero() { |
| 387 | let mut burst = PasteBurst::default(); |
| 388 | let t0 = Instant::now(); |
| 389 | let _ = burst.on_plain_char('a', t0); |
| 390 | |
| 391 | let almost_due = t0 + Duration::from_millis(7); |
| 392 | let remaining = burst |
| 393 | .next_flush_delay(almost_due) |
| 394 | .expect("delay should exist"); |
| 395 | assert!(remaining <= Duration::from_millis(1)); |
| 396 | |
| 397 | let due = t0 + Duration::from_millis(20); |
| 398 | assert_eq!(burst.next_flush_delay(due), Some(Duration::ZERO)); |
| 399 | } |
| 400 | |
| 401 | /// Simulate #2134: when a non-char key (Tab) arrives during table-data |
| 402 | /// paste, `deactivate_keep_window` resets accumulation state but |
| 403 | /// preserves the Enter-suppression window so a trailing newline is still |
| 404 | /// absorbed instead of submitting the partial input. |
| 405 | #[test] |
| 406 | fn deactivate_keep_window_preserves_enter_suppression_window() { |
| 407 | let mut burst = PasteBurst::default(); |
| 408 | let t0 = Instant::now(); |
| 409 | |
| 410 | assert!(matches!( |
| 411 | burst.on_plain_char('a', t0), |
| 412 | CharDecision::RetainFirstChar |
| 413 | )); |
| 414 | let t1 = t0 + Duration::from_millis(1); |
| 415 | assert!(matches!( |
| 416 | burst.on_plain_char('b', t1), |
| 417 | CharDecision::BeginBufferFromPending |
| 418 | )); |
| 419 | burst.append_char_to_buffer('b', t1); |
| 420 | assert!(burst.is_active()); |
| 421 | assert!(burst.newline_should_insert_instead_of_submit(t1)); |
| 422 | |
| 423 | let flushed = burst.flush_before_modified_input(); |
| 424 | assert!(flushed.is_some()); |
| 425 | assert!(!burst.is_active()); |
| 426 | |
| 427 | burst.deactivate_keep_window(); |
| 428 | |
| 429 | assert!(!burst.is_active()); |
| 430 | |
| 431 | let t_tab = t1 + Duration::from_millis(2); |
| 432 | assert!( |
| 433 | burst.newline_should_insert_instead_of_submit(t_tab), |
| 434 | "Enter within suppression window should insert newline, not submit" |
| 435 | ); |
| 436 | |
| 437 | let t_expired = t_tab + PASTE_ENTER_SUPPRESS_WINDOW + Duration::from_millis(1); |
| 438 | assert!( |
| 439 | !burst.newline_should_insert_instead_of_submit(t_expired), |
| 440 | "Enter after suppression window expires should submit" |
| 441 | ); |
| 442 | } |
| 443 | |
| 444 | /// The idle flush must NOT drop the Enter-suppression window. The active |
| 445 | /// idle timeout is only 8ms, so a paste's trailing newline can easily |
| 446 | /// land just after the flush on a laggy link — dropping the window there |
| 447 | /// would submit a partial paste (#1073). |
| 448 | #[test] |
| 449 | fn idle_flush_keeps_enter_suppression_window_alive() { |
| 450 | let mut burst = PasteBurst::default(); |
| 451 | let t0 = Instant::now(); |
| 452 | |
| 453 | let _ = burst.on_plain_char('a', t0); |
| 454 | let t1 = t0 + Duration::from_millis(1); |
| 455 | assert!(matches!( |
| 456 | burst.on_plain_char('b', t1), |
| 457 | CharDecision::BeginBufferFromPending |
| 458 | )); |
| 459 | burst.append_char_to_buffer('b', t1); |
| 460 | |
| 461 | let t_flush = t1 + PasteBurst::recommended_active_flush_delay(); |
| 462 | assert!(matches!( |
| 463 | burst.flush_if_due(t_flush), |
| 464 | FlushResult::Paste(ref s) if s == "ab" |
| 465 | )); |
| 466 | assert!(!burst.is_active()); |
| 467 | assert!( |
| 468 | burst.newline_should_insert_instead_of_submit(t_flush), |
| 469 | "a trailing pasted newline arriving right after the idle flush \ |
| 470 | must still be absorbed instead of submitting" |
| 471 | ); |
| 472 | } |
| 473 | |
| 474 | /// …but the window is *bounded*: it expires 120ms after the last real |
| 475 | /// keystroke and nothing about the flush re-arms it, so the user's next |
| 476 | /// Enter submits. |
| 477 | #[test] |
| 478 | fn enter_suppression_window_expires_after_the_last_keystroke() { |
| 479 | let mut burst = PasteBurst::default(); |
| 480 | let t0 = Instant::now(); |
| 481 | |
| 482 | let _ = burst.on_plain_char('a', t0); |
| 483 | let t1 = t0 + Duration::from_millis(1); |
| 484 | let _ = burst.on_plain_char('b', t1); |
| 485 | burst.append_char_to_buffer('b', t1); |
| 486 | let t_flush = t1 + PasteBurst::recommended_active_flush_delay(); |
| 487 | let _ = burst.flush_if_due(t_flush); |
| 488 | |
| 489 | let t_late = t1 + PASTE_ENTER_SUPPRESS_WINDOW + Duration::from_millis(1); |
| 490 | assert!( |
| 491 | !burst.newline_should_insert_instead_of_submit(t_late), |
| 492 | "Enter more than the suppression window after the paste must submit" |
| 493 | ); |
| 494 | } |
| 495 | |
| 496 | /// A lone IME candidate commit is ordinary typing: it may only hold Enter |
| 497 | /// for one burst interval, so a user finishing a CJK sentence and |
| 498 | /// pressing Enter actually sends. |
| 499 | #[test] |
| 500 | fn lone_non_ascii_commit_arms_only_a_burst_interval_window() { |
| 501 | let mut burst = PasteBurst::default(); |
| 502 | let t0 = Instant::now(); |
| 503 | |
| 504 | let rapid = burst.note_plain_char(t0); |
| 505 | assert_eq!(rapid, 1, "an isolated commit is a run of one"); |
| 506 | burst.arm_window_for_direct_char(t0, rapid); |
| 507 | |
| 508 | assert!( |
| 509 | burst.newline_should_insert_instead_of_submit(t0 + PASTE_BURST_CHAR_INTERVAL), |
| 510 | "a raw paste delivers its trailing newline within the burst \ |
| 511 | interval and must still be absorbed (#1302)" |
| 512 | ); |
| 513 | assert!( |
| 514 | !burst.newline_should_insert_instead_of_submit( |
| 515 | t0 + PASTE_BURST_CHAR_INTERVAL + Duration::from_millis(1) |
| 516 | ), |
| 517 | "an IME commit must not swallow the Enter a human presses \ |
| 518 | tens of milliseconds later" |
| 519 | ); |
| 520 | } |
| 521 | |
| 522 | /// Two non-ASCII characters at paste speed mean the stream is a paste, |
| 523 | /// so the full suppression window applies to later lines. |
| 524 | #[test] |
| 525 | fn rapid_non_ascii_run_arms_the_full_suppression_window() { |
| 526 | let mut burst = PasteBurst::default(); |
| 527 | let t0 = Instant::now(); |
| 528 | |
| 529 | let rapid = burst.note_plain_char(t0); |
| 530 | burst.arm_window_for_direct_char(t0, rapid); |
| 531 | let t1 = t0 + Duration::from_millis(1); |
| 532 | let rapid = burst.note_plain_char(t1); |
| 533 | assert_eq!(rapid, 2); |
| 534 | burst.arm_window_for_direct_char(t1, rapid); |
| 535 | |
| 536 | assert!( |
| 537 | burst.newline_should_insert_instead_of_submit(t1 + PASTE_ENTER_SUPPRESS_WINDOW), |
| 538 | "a raw CJK paste must keep absorbing its embedded newlines" |
| 539 | ); |
| 540 | assert!( |
| 541 | !burst.newline_should_insert_instead_of_submit( |
| 542 | t1 + PASTE_ENTER_SUPPRESS_WINDOW + Duration::from_millis(1) |
| 543 | ), |
| 544 | "even a paste-speed run releases Enter once the window lapses" |
| 545 | ); |
| 546 | } |
| 547 | |
| 548 | /// A slow IME sequence never accumulates a rapid run, so every commit |
| 549 | /// re-arms only the short window and Enter stays available throughout. |
| 550 | #[test] |
| 551 | fn slow_ime_sequence_never_holds_enter() { |
| 552 | let mut burst = PasteBurst::default(); |
| 553 | let t0 = Instant::now(); |
| 554 | |
| 555 | // "你好世界" committed one character at a time with human gaps. |
| 556 | for i in 0..4u64 { |
| 557 | let now = t0 + Duration::from_millis(50 * i); |
| 558 | let rapid = burst.note_plain_char(now); |
| 559 | assert_eq!(rapid, 1, "50ms gaps are never a paste-speed run"); |
| 560 | burst.arm_window_for_direct_char(now, rapid); |
| 561 | } |
| 562 | |
| 563 | let last = t0 + Duration::from_millis(150); |
| 564 | assert!( |
| 565 | !burst.newline_should_insert_instead_of_submit(last + Duration::from_millis(30)), |
| 566 | "Enter after an IME-typed CJK message must submit" |
| 567 | ); |
| 568 | } |
| 569 | } |
| 570 |