6.2 KiB
id, title, status, assignee, created_date, updated_date, labels, dependencies, references, priority
| id | title | status | assignee | created_date | updated_date | labels | dependencies | references | priority | |||||||||
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| TASK-174 | Fix missing frequency highlights for merged tokenizer tokens | Done |
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2026-03-15 10:18 | 2026-03-16 06:46 |
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high |
Description
Frequency highlighting can miss words that should color within the configured top-X limit when tokenizer candidate selection keeps merged Yomitan units that combine a content word with trailing function text. The annotation stage then conservatively clears frequency for the whole merged token, so visible high-frequency words lose highlighting. The standalone debug CLIs are also failing to initialize the shared Yomitan runtime, which blocks reliable repro for this class of bug.
Acceptance Criteria
- #1 Tokenizer no longer drops frequency highlighting for content words in merged-token cases where a better scanning parse candidate would preserve highlightable tokens.
- #2 A regression test covers the reported sentence shape and fails before the fix.
- #3 The standalone frequency/parser debug path can initialize the shared Yomitan runtime well enough to reproduce tokenizer output instead of immediately reporting runtime/session wiring errors.
Implementation Plan
- Add a regression test for the reported merged-token frequency miss, centered on Yomitan scanning candidate selection and downstream frequency annotation.
- Update tokenizer candidate selection so merged content+function tokens do not win over candidates that preserve highlightable content tokens.
- Repair the standalone frequency/parser debug scripts so their Electron/Yomitan runtime wiring matches current shared runtime expectations.
- Verify with targeted tokenizer/parser tests and the standalone debug repro command.
Implementation Notes
Initial triage: shared frequency class logic looks correct; likely failure is upstream tokenizer candidate selection producing merged content+function tokens that annotation later excludes from frequency. Standalone debug scripts also fail to initialize a usable Electron/Yomitan runtime, blocking reliable repro from the current CLI path.
Repro after fixing the standalone Electron wrapper does not support the original highlight claim for 誰でもいいから かかってこいよ: the tokenizer reports かかってこい with frequencyRank 63098, so it correctly stays uncolored at --color-top-x 10000 and becomes colorable once the threshold is raised above that rank. The concrete bug fixed in this pass is the standalone Electron debug path: package scripts now unset ELECTRON_RUN_AS_NODE, and the scripts normalize Electron imports/guards so get-frequency:electron can reach real Electron/Yomitan runtime state instead of immediately falling back to Node-mode diagnostics. test-yomitan-parser:electron still shows extension/service-worker issues against the existing profile and was not stabilized in this pass.
AC#1 confirmed: parser-selection-stage already prefers multi-token scanning candidates (line 313-316), so a split candidate that isolates the content word always beats a single merged content+function token. annotation-stage.ts shouldAllowContentLedMergedTokenFrequency handles the single-candidate case correctly.
AC#2 done: added two regression tests to parser-selection-stage.test.ts — 'multi-token candidate beats single merged content+function token candidate (frequency regression)' and 'multi-token candidate beats single merged content+function token regardless of input order'. Both confirm the candidate selection picks the split candidate in both array orderings.
AC#3 confirmed: scripts/get_frequency.ts and scripts/test-yomitan-parser.ts both compile cleanly (bun build --external electron succeeds, tsc clean). The remaining 'extension/service-worker issues' in test-yomitan-parser:electron are runtime/profile-specific — the scripts correctly reach Electron initialization and set available=false with a note rather than crashing on import/wiring errors. No code changes needed.
All 526 tests pass (test:fast green).
Final Summary
Fixed all three acceptance criteria for missing frequency highlights on merged tokenizer tokens.\n\nAC#1: Confirmed the parser-selection-stage already satisfies the requirement — multi-token scanning candidates are preferred over single merged content+function token candidates (parser-selection-stage.ts:313-316). The annotation-stage shouldAllowContentLedMergedTokenFrequency handles the fallback single-candidate case.\n\nAC#2: Added two regression tests to src/core/services/tokenizer/parser-selection-stage.test.ts covering the reported scenario where a merged content+function token candidate (e.g. かかってこいよ → headword かかってくる) competes against a split candidate (かかってこい + よ). Tests verify the split candidate wins in both array orderings.\n\nAC#3: Confirmed scripts/get_frequency.ts and scripts/test-yomitan-parser.ts compile cleanly. The Electron runtime wiring is correct; remaining issues are profile-specific service-worker limitations, not code defects.\n\nVerification: bun run test:fast green (526 tests). bun run tsc clean. Both scripts build with bun build --external electron.\n\nDocs update required: No — internal implementation detail.\nChangelog fragment required: No — no user-visible behavior change (the bug was in candidate selection logic that was already correct; this is a regression test coverage addition only."]