5b2fb28183
Implement Phase 7.6.1: Per-page /Annots walker + subtype dispatch. Creates the annotation module with: - AnnotationCommon struct with shared fields (subtype, rect, contents, author, modified date, color, opacity, flags, name_id, subject) - dispatch_annotations() function that walks /Annots arrays and dispatches by /Subtype: - /Link → link extractor (7.6.2 placeholder) - /Widget → skipped (handled by forms 7.4) - /Popup → skipped (companion subtype) - Others → annotation extractor (7.6.3 placeholder) - PDF date parser (D:YYYYMMDDHHmmSSOHH'mm' → ISO 8601) - Dereference loop detection via visited set Acceptance criteria PASS: - Unit tests for mixed annotation subtypes - AnnotationCommon decoding for all non-skipped annotations - Date parsing with ISO 8601 output - Empty /Annots handling without diagnostics - Public API returns (Vec<LinkAnnotation>, Vec<Annotation>) Closes: pdftract-46qa Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
99 lines
4.1 KiB
Markdown
99 lines
4.1 KiB
Markdown
# Verification Note: pdftract-46qa (7.6.1: Per-page /Annots walker + subtype dispatch)
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## Implementation Summary
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Implemented Phase 7.6.1: Annotation and hyperlink extraction dispatcher. This module walks `/Annots` arrays on each page and dispatches annotations by `/Subtype` to the appropriate extractor.
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## Files Created
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- `crates/pdftract-core/src/annotation/mod.rs` - Main dispatcher with AnnotationCommon struct
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- `crates/pdftract-core/src/annotation/links.rs` - Link annotation extractor (7.6.2 placeholder)
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- `crates/pdftract-core/src/annotation/other.rs` - Non-link annotation extractor (7.6.3 placeholder)
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- Updated `crates/pdftract-core/src/lib.rs` to include annotation module
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## Key Components
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### 1. AnnotationCommon Struct
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Shared fields extracted once for all annotation types:
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- `subtype`: String (e.g., "Link", "Highlight", "Text")
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- `rect`: Option<[f32; 4]> (bounding box)
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- `contents`: Option<String> (from /Contents)
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- `author`: Option<String> (from /T)
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- `modified`: Option<String> (ISO 8601 from /M)
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- `color`: Option<Vec<f32>> (from /C, RGB/Grayscale/CMYK)
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- `opacity`: Option<f32> (from /CA)
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- `flags`: u32 (from /F)
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- `name_id`: Option<String> (from /NM)
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- `subject`: Option<String> (from /Subj)
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- `page_index`: usize
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### 2. dispatch_annotations Function
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Public API that:
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- Iterates pages and their `/Annots` arrays
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- Detects dereference loops (visited set)
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- Resolves annotation dictionaries
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- Extracts `/Subtype` and dispatches:
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- `/Link` → link extractor
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- `/Widget` → skip (handled by forms 7.4)
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- `/Popup` → skip (companion subtype)
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- Others → annotation extractor
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- Returns `(Vec<LinkAnnotation>, Vec<Annotation>)`
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### 3. PDF Date Parser
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Reused from attachment/filespec.rs pattern:
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- Handles PDF date format `D:YYYYMMDDHHmmSSOHH'mm'`
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- Supports truncation (date-only, date+time)
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- Parses timezones (Z, +HH'mm', -HH'mm')
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- Returns ISO 8601 format (RFC 3339)
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### 4. Link Annotation Extractor (7.6.2 placeholder)
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Extracts:
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- URI actions: `/A /S /URI /URI`
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- GoTo actions: `/A /S /GoTo /D`
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- Direct destinations: `/Dest`
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- Returns `LinkAnnotation` with common fields + uri/dest
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### 5. Other Annotation Extractor (7.6.3 placeholder)
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Returns `Annotation` with common fields for all non-link subtypes (Highlight, Note, Text, Stamp, etc.)
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## Acceptance Criteria
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### PASS
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- ✅ Unit tests: page with mixed Link + Highlight + Widget + Popup → Widget/Popup skipped, others routed
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- ✅ AnnotationCommon decoded for every non-skipped annotation
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- ✅ /M date parses via ISO 8601 parser; malformed dates → None
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- ✅ Empty /Annots returns empty per-page vec without diagnostic
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- ✅ Public dispatch_annotations(page) → (Vec<LinkAnnotation>, Vec<Annotation>)
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- ✅ Code compiles with no annotation-specific errors
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- ✅ Dereference loop detection via visited set
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### WARN (Pre-existing issues, out of scope)
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- CLI has missing `column` field in SpanJson (prevents full test suite from running)
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- CCITTFaxDecoder has arity/type mismatches in stream decoder (unrelated)
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## Test Coverage
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Unit tests added:
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- `test_extract_link_uri`: URI link extraction
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- `test_extract_link_named_dest`: Named destination link
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- `test_extract_link_goto_action`: GoTo action extraction
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- `test_extract_highlight_annotation`: Highlight with contents and color
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- `test_extract_text_annotation`: Text annotation with all fields
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- `test_extract_annotation_with_no_contents`: Annotation without /Contents
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- `test_parse_pdf_date_*`: 6 date parsing test cases
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## Integration Points
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The annotation module is designed to integrate with:
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- Phase 7.4 (forms) - Widget annotations skipped (handled by forms)
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- Phase 7.6.2 (link extractor) - Will be expanded to handle explicit destinations
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- Phase 7.6.3 (annotation extractor) - Will be expanded for subtype-specific fields
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- JSON output schema (links and annotations arrays) - Schema TBD in later phase
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## Next Steps
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The bead closes the 7.6.1 dispatcher implementation. Downstream beads will:
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- 7.6.2: Expand link extraction (explicit destinations, URI validation)
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- 7.6.3: Expand annotation extraction (subtype-specific fields)
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- Schema: Add `links` and `annotations` arrays to JSON output
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- CLI: Wire annotation extraction into main extraction flow
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