docs(pdftract-4453y): add Phase 4.6 coordinator verification note
Phase 4.6 Output Serialization (Plain Text Mode) coordinator is complete. All 5 children beads are closed and all acceptance criteria PASS. Acceptance criteria verified: - All children closed: pdftract-56txm, pdftract-2bpzs, pdftract-38p8h, pdftract-3bgxq, pdftract-529te - 10-page doc: 9 form-feed characters (test_serialize_document_text_ten_pages) - Header excluded by default; included with flag - Invisible Tr=3 excluded by default - Text round-trips with join Test results: - text.rs: 160 tests passed - options.rs: 41 tests passed Closes pdftract-4453y.
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notes/pdftract-4453y.md
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# Phase 4.6: Output Serialization Plain Text (Coordinator) - Verification Note
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## Summary
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Phase 4.6 coordinator bead `pdftract-4453y` is complete. All 5 child beads are closed and the implementation satisfies all acceptance criteria.
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## Children Closed
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All 5 dependencies of this coordinator are closed:
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1. **pdftract-56txm**: Phase 4.5: Reading Order (coordinator) - CLOSED
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2. **pdftract-2bpzs**: OutputOptions struct + block-kind filter - CLOSED
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3. **pdftract-38p8h**: Invisible text filter - CLOSED
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4. **pdftract-3bgxq**: Document-level serializer (form feed) - CLOSED
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5. **pdftract-529te**: Per-page block serializer - CLOSED
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## Acceptance Criteria Status
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| Criterion | Status | Evidence |
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|-----------|--------|----------|
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| All children closed | **PASS** | All 5 children verified closed via `bf show` |
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| 10-page doc: 9 form-feed characters | **PASS** | `test_serialize_document_text_ten_pages` verifies exactly 9 form feeds |
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| Header block excluded by default; included with flag | **PASS** | `test_serialize_page_text_header_excluded_by_default` and `test_serialize_page_text_header_included_when_flagged` |
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| Invisible Tr=3 excluded by default | **PASS** | `test_should_include_span_invisible_mode_3_excluded_by_default` and related tests |
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| Text round-trips with join | **PASS** | All serialization tests pass; proper `\n\n` and `\f` joining |
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## Implementation Files
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### Core Implementation
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- `crates/pdftract-core/src/text.rs` - Per-page and document-level serialization
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- `crates/pdftract-core/src/options.rs` - `OutputOptions` struct with filtering
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### CLI Integration
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- `crates/pdftract-cli/src/main.rs` - CLI flags wired to options:
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- `--include-headers` / `--include-footers` / `--include-headers-footers`
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- `--include-invisible-text`
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- `--include-watermarks`
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## Key Invariants Verified
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### Form Feed Invariant (INV)
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- **N pages → N-1 form feeds**: `serialize_document_text` uses `join("\u{000C}")` which produces exactly N-1 form feeds
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- No leading form feed
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- No trailing form feed
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- Empty page in middle: form feed before AND after
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Test evidence:
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- `test_serialize_document_text_one_page`: 0 form feeds
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- `test_serialize_document_text_two_pages`: 1 form feed
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- `test_serialize_document_text_ten_pages`: 9 form feeds
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- `test_serialize_document_text_empty_page_in_middle`: 2 form feeds with empty middle page
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### Block-Kind Filtering
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- Header/Footer excluded by default (controlled via `OutputOptions`)
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- Watermark excluded (no-op until Phase 7)
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- Filtering at block level via `OutputOptions::include_block_kind`
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Test evidence:
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- `test_serialize_page_text_header_excluded_by_default`: header not in output
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- `test_serialize_page_text_header_included_when_flagged`: header included with flag
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- `test_serialize_page_text_watermark_excluded_by_default`: watermark not in output
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### Invisible Text Filtering (SPAN-level)
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- Filtering at SPAN level, not block level
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- Tr=3 excluded by default (invisible)
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- Tr=4-7 treated same as Tr=3 (invisible variants)
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- Mixed-visibility blocks: visible emitted, invisible dropped
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- All-invisible blocks: no spurious `\n\n`
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Test evidence:
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- `test_should_include_span_invisible_mode_3_excluded_by_default`: Tr=3 filtered
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- `test_should_include_span_invisible_mode_4_excluded_by_default` through `test_should_include_span_invisible_mode_7`: Tr=4-7 filtered
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- `test_compute_block_text_from_spans_mixed_visibility`: mixed block emits only visible
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- `test_serialize_page_text_all_invisible_block_omitted`: all-invisible produces empty (no `\n\n`)
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### Paragraph/Block Joining
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- Blocks separated by `\n\n`
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- Paragraph/Heading/Caption/Quote: space-joined lines
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- List/Code: newline-joined lines
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- Figure: empty string (no text content)
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Test evidence:
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- `test_serialize_page_text_three_paragraphs`: "Foo\n\nBar\n\nBaz"
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- `test_serialize_page_text_heading_and_paragraphs`: "Title\n\nP1\n\nP2"
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- `test_serialize_page_text_list`: lines joined with `\n`
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- `test_serialize_page_text_figure_emits_empty`: figure produces ""
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## Test Results
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### text.rs tests (160 passed)
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```
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cargo test -p pdftract-core --lib text
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test result: ok. 160 passed; 0 failed; 0 ignored
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```
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Key tests verifying acceptance criteria:
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- `test_serialize_document_text_ten_pages`: 9 form feeds ✓
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- `test_serialize_page_text_header_excluded_by_default` ✓
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- `test_serialize_page_text_header_included_when_flagged` ✓
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- `test_should_include_span_invisible_mode_3_excluded_by_default` ✓
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- All rendering mode tests (Tr=0 through Tr=7) ✓
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### options.rs tests (41 passed)
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```
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cargo test -p pdftract-core --lib options
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test result: ok. 41 passed; 0 failed; 0 ignored
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```
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Key tests:
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- `test_output_options_default`: all exclude defaults ✓
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- `test_output_options_include_block_kind`: header/footer/watermark filtering ✓
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- `test_output_options_include_span`: invisible/hidden layer filtering ✓
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## References
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- Plan section: Phase 4.6 Output Serialization (lines 1760-1776)
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- Bead: pdftract-4453y
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- Children: pdftract-56txm, pdftract-2bpzs, pdftract-38p8h, pdftract-3bgxq, pdftract-529te
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## Conclusion
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Phase 4.6 Output Serialization (Plain Text Mode) is fully implemented and verified. All acceptance criteria PASS. The implementation correctly:
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1. Joins blocks in reading order with `\n\n`
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2. Joins pages with form feed `\f` (exactly N-1 for N pages)
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3. Excludes headers/footers by default with CLI flags to include
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4. Excludes invisible text (Tr=3+) by default with CLI flag to include
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5. Filters at SPAN level for invisible text, BLOCK level for kinds
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