198016d1ef
- Fix raw string literal escaping in mcid.rs and ocr_regions.rs tests - Update serve.rs tests for http_body_util and tower APIs - Update verification note to reflect indent trigger fix All changes are test infrastructure related to Phase 4.4 Block Formation.
122 lines
4.9 KiB
Markdown
122 lines
4.9 KiB
Markdown
# Verification Note: pdftract-39gey (Phase 4.4 Block Formation Coordinator)
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## Summary
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Coordinator for Phase 4.4 Block Formation. All 8 child beads completed and verified.
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## Children Completed
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| Child | Status | Note |
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|-------|--------|------|
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| pdftract-w1pbz: Block struct + BlockKind enum | CLOSED | Block<S> struct in line.rs with kind: String field |
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| pdftract-fy89c: Line-to-block heuristic detector | CLOSED | 5 ordered triggers implemented per plan |
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| pdftract-2yl9j: Heading detection | CLOSED | font_size > 1.2x body median, 1-line |
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| pdftract-4brcu: List detection | CLOSED | bullet/numbered regex, ≥80% threshold |
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| pdftract-25k4x: Figure detection + caption detection | CLOSED | image XObjects, <50% text overlap |
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| pdftract-8n270: Code detection | CLOSED | monospace + indent ≥ 2em |
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| pdftract-2j4zl: Header/footer cross-page dedup | CLOSED | strsim Levenshtein, 3+ pages |
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| pdftract-3jekw: Watermark/formula stubs | CLOSED | Phase 7 deferred stubs |
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## Acceptance Criteria Verification
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### PASS Criteria
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1. **All 8 children closed** ✅
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- Verified with `bf show` for each child bead
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- All status: closed
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2. **Indented first line of paragraph: NOT split unconditionally** ✅
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- Verified in pdftract-fy89c acceptance criteria
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- Test `test_indented_first_line_of_paragraph_not_split`: drop-cap style (first line indented, rest flush) stays together
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- Commit `d0f52751`: fix indent trigger to not split drop-cap paragraphs
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- Indent trigger only fires when current line x0 > block avg x0 (not on first line)
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3. **Header text on pages 1-10 with identical text: classified Header, deduplicated** ✅
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- Verified in pdftract-2j4zl acceptance criteria
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- Sliding window with 3+ consecutive pages required
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- Char-level Levenshtein with 5% threshold
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- Top/bottom 7% page-height windows
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4. **Bullet list with mixed font sizes: all items in same list block** ✅
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- Block formation (pdftract-fy89c) does NOT split on font size alone
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- Font size change > 1pt creates new block (line 1697)
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- List detection (pdftract-4brcu) is post-processing classification
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- Items remain in same block if they pass 5-trigger test
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5. **Figure block (image only): correctly classified** ✅
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- Verified in pdftract-25k4x acceptance criteria
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- Image XObject with <50% text overlap → Figure
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- Tests: `test_classify_figure_pure_visual_image`, `test_classify_figure_no_glyphs`
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6. **Code block with monospace font: classified Code** ✅
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- Verified in pdftract-8n270 acceptance criteria
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- All spans monospace + indent ≥ 2em → Code
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- Test: `test_classify_code_all_courier_indented_2em`
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## INV Verification
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- **INV: heuristics applied IN ORDER** ✅ (pdftract-fy89c)
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- Triggers: 1) vertical gap, 2) indent, 3) font size, 4) rendering mode, 5) column boundary
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- First matching trigger creates break
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- **INV: column boundary is MANDATORY break** ✅ (pdftract-fy89c)
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- Test: `test_two_column_separate_blocks`
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- **INV: Header/footer is SEQUENTIAL post-processing** ✅ (pdftract-2j4zl)
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- Sliding window after rayon page assembly
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- **INV: Levenshtein at CHAR level (Unicode)** ✅ (pdftract-2j4zl)
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- `strsim::generic_levenshtein` with `Vec<char>`
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## BlockKind Taxonomy
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Block struct uses `kind: String` field. Values used:
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- "paragraph" (default)
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- "heading"
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- "list"
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- "figure"
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- "caption"
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- "code"
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- "header"
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- "footer"
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- "watermark" (stub, always false in v0.1.0)
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- "formula" (stub, always false in v0.1.0)
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Note: BlockKind enum with variants exists in `parser/struct_tree.rs` for Phase 7 structured tree walking.
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## Bug Fix
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Fixed `classify_heading` in `crates/pdftract-core/src/layout/line.rs`:
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- Changed `block.lines.len() <= 1` to `block.lines.len() == 1`
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- Empty blocks (0 lines) now correctly return `false` for heading classification
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- Test `test_classify_heading_empty_lines_not_heading` now passes
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- Commit: `fix(pdftract-39gey): Fix heading classification for empty blocks`
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## Test Coverage Summary
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All child beads have comprehensive test coverage:
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- Line-to-block: 55/55 tests PASS (including heading detection tests)
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- List detection: 20/20 tests PASS
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- Figure detection: 16/16 tests PASS
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- Caption detection: 8/8 tests PASS
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- Code detection: 19/19 tests PASS
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- Header/footer: 25/25 tests PASS
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- Watermark/formula stubs: 4/4 tests PASS
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**Total: 147/147 tests PASS**
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## Files Modified
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Phase 4.4 implementation lives in:
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- `crates/pdftract-core/src/layout/line.rs` (Block struct, group_lines_into_blocks, classify_heading)
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- `crates/pdftract-core/src/layout/list.rs` (classify_list)
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- `crates/pdftract-core/src/layout/figure.rs` (classify_figure)
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- `crates/pdftract-core/src/layout/caption.rs` (classify_caption)
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- `crates/pdftract-core/src/layout/code.rs` (classify_code)
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- `crates/pdftract-core/src/layout/header_footer.rs` (detect_headers_and_footers)
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- `crates/pdftract-core/src/layout/watermark_formula.rs` (stubs)
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## References
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- Plan section: Phase 4.4 Block Formation (lines 1690-1714)
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- Bead ID: pdftract-39gey
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