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SubMiner/backlog/tasks/task-23.1 - Implement-JLPT-token-lookup-service-for-subtitle-words.md
2026-02-15 16:28:00 -08:00

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---
id: TASK-23.1
title: Implement JLPT token lookup service for subtitle words
status: In Progress
assignee: []
created_date: '2026-02-13 16:42'
labels: []
dependencies: []
parent_task_id: TASK-23
priority: high
---
## Description
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Create a lookup layer that parses/queries the bundled JLPT dictionary file and returns JLPT level for a given token/word. Integrate with subtitle tokenization path with minimal performance overhead.
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## Acceptance Criteria
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- [x] #1 Service accepts a token/normalized token and returns JLPT level or no-match deterministically.
- [x] #2 Lookup handles expected dictionary format edge cases and unknown tokens without throwing.
- [ ] #3 Lookup path is efficient enough for frame-by-frame subtitle updates.
- [x] #4 Tokenizer interaction preserves existing token ordering and positions needed for rendering spans/underlines.
- [ ] #5 Behavior on malformed/unsupported dictionary format is documented with fallback semantics.
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## Note
- Full performance and malformed-format limitation documentation is deferred per request and will be handled in a separate pass if needed.
## Definition of Done
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- [x] #1 Lookup service returns JLPT level with deterministic output for test fixtures.
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