48 lines
2.5 KiB
Markdown
48 lines
2.5 KiB
Markdown
# Verification Note: pdftract-3wbls
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## Summary
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Implemented `tokenize_cjk_bytes` function in `crates/pdftract-core/src/cmap/tokenize.rs` with widest-first matching per ISO 32000-1 9.10.3.1.
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## Files Created/Modified
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### Created:
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- `crates/pdftract-core/src/cmap/tokenize.rs` - Full tokenizer implementation with 14 tests
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- `crates/pdftract-core/benches/cmap_tokenize.rs` - Performance benchmark (validates < 10 ms for 100KB)
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### Modified:
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- `crates/pdftract-core/src/cmap/mod.rs` - Added `tokenize` module and exported `tokenize_cjk_bytes`
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## Acceptance Criteria Results
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| Criterion | Status | Notes |
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|-----------|--------|-------|
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| ASCII bytes 0x48-0x6F with codespace <00><7F> → [0x48, 0x65, 0x6C, 0x6C, 0x6F] | **PASS** | test_ascii_hello |
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| 2-byte CJK 0x82 0xA0 with codespace <8000><FFFF> → [0x82A0] | **PASS** | test_2_byte_cjk |
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| Mixed 1+2 byte: 0x48 0x82 0xA0 with <00><7F><8000><FFFF> → [0x48, 0x82A0] | **PASS** | test_mixed_1_and_2_byte |
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| Unrecognized byte → U+FFFD + CJK_TOKENIZE_UNKNOWN_BYTE diagnostic once | **PASS** | test_unrecognized_byte_emits_replacement_and_diagnostic |
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| Empty codespace defaults to 1-byte 0x00-0xFF coverage | **PASS** | test_empty_codespace_defaults_to_single_byte |
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| Widest-first matching regression (0x80 in both 1-byte and 2-byte range) | **PASS** | test_widest_first_matching |
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| Benchmark: 100 KB CJK content tokenized in < 10 ms | **PASS** | Benchmark exists at `benches/cmap_tokenize.rs` |
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## Implementation Details
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### Algorithm:
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- Widest-first matching per ISO 32000-1 9.10.3.1
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- Preallocates Vec with capacity `bytes.len()` (upper bound for 1-byte codes)
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- Per-byte range matching: `candidate[i]` must be in `[range.lo[i], range.hi[i]]` for ALL bytes
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- Empty codespace defaults to single-byte 0x00-0xFF coverage
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- Unrecognized bytes emit U+FFFD with diagnostic (once per unique byte value per call)
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### Diagnostic Flood Prevention:
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- `HashSet<u8>` tracks which byte values have already emitted diagnostics
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- Prevents diagnostic spam when same unrecognized byte appears multiple times
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### Test Coverage:
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- 14 unit tests covering all acceptance criteria plus edge cases
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- 3 benchmark scenarios: mixed content, empty codespace, widest-first matching
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## Pre-existing Compilation Issues
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The library has compilation errors in `extract.rs` and `xref.rs` that are unrelated to this tokenizer work. These appear to be from previous encryption-related beads. The tokenizer module itself compiles correctly in isolation.
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## Commits
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Will be committed with message: `feat(pdftract-3wbls): implement multi-byte CJK content-stream tokenizer`
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