docs(pdftract-2bsfc): add verification note
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jedarden
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2 changed files with 129 additions and 45 deletions
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@ -2,46 +2,49 @@
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## Summary
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Implemented the document catalog parser (`/Root` traversal) for PDF documents. The catalog parser extracts all key entries from the document catalog including Pages, Outlines, MarkInfo, StructTreeRoot, AcroForm, Names, Metadata, PageLabels, OCProperties, OpenAction, AA, and Version.
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Implemented document catalog parser (`parse_catalog`) that parses the PDF /Root object and extracts all key catalog entries including Pages, Outlines, MarkInfo, StructTreeRoot, AcroForm, Names, Metadata, PageLabels, OCProperties, OpenAction, AA, and Version.
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## Implementation Details
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## Implementation
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### Files Modified
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- `crates/pdftract-core/src/parser/catalog.rs` - Full implementation with comprehensive tests
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### Catalog Struct (crates/pdftract-core/src/parser/catalog.rs)
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### Key Structures Implemented
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1. **MarkInfo** - Parses `/MarkInfo` dictionary with `is_tagged`, `user_properties`, `suspects` fields
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2. **PageLabelStyle** - Enum for all label styles (D, R, r, A, a)
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3. **PageLabel** - Single page label with style, prefix, and start value
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4. **PageLabelsTree** - Number tree parser for `/PageLabels` with `/Nums` and `/Kids` support
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5. **OcProperties** - Stub for OCG implementation (delegated to dedicated bead)
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6. **Catalog** - Main catalog struct with all required and optional fields
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- `pages_ref: ObjRef` - Required reference to /Pages dict
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- `outlines_ref: Option<ObjRef>` - Optional /Outlines
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- `mark_info: MarkInfo` - Tagged PDF indicator (is_tagged, user_properties, suspects)
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- `struct_tree_root_ref: Option<ObjRef>` - Logical structure tree root
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- `acroform_ref: Option<ObjRef>` - AcroForm dict (used by XFA detection)
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- `names_ref: Option<ObjRef>` - Names tree
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- `metadata_ref: Option<ObjRef>` - XMP metadata stream (used by conformance detection)
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- `page_labels: Option<PageLabelsTree>` - Number tree for page labels
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- `oc_properties: Option<OcProperties>` - Optional content properties (stub for OCG bead)
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- `open_action: Option<PdfObject>` - Open action (used by JS detection)
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- `aa: Option<PdfObject>` - Additional actions (used by JS detection)
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- `version: Option<String>` - PDF version override from catalog
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### Number Tree Implementation
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- Parses `/Nums` arrays (leaf nodes with alternating key-value pairs)
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- Supports `/Kids` arrays (internal nodes for recursive tree traversal)
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- Provides `get_label_with_start()` and `get_label()` methods for lookup
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- Correctly formats roman numerals (uppercase/lowercase) and letter sequences
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### Page Label Formatting
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- Decimal arabic numerals: 1, 2, 3, ...
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- Roman uppercase: I, II, III, IV, ...
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- Roman lowercase: i, ii, iii, iv, ...
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- Letters uppercase: A, B, C, ..., Z, AA, AB, ...
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- Letters lowercase: a, b, c, ..., z, aa, bb, ...
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- Supports prefixes (e.g., "front-i", "Appendix-ii")
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PageLabels are parsed via a number tree that:
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- Recursively walks /Kids (internal nodes) and /Nums (leaf nodes)
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- Parses /Nums as alternating [key value key value ...] arrays
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- Flattens to sorted Vec<(i64, PageLabel)> for efficient lookup
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- Supports label styles: D (decimal), R (roman upper), r (roman lower), A (letters upper), a (letters lower)
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- Supports prefix strings and start values
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### Label Formatting
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- Roman numerals: I, II, III, IV, V, IX, X, XL, L, XC, C, CD, D, CM, M, etc.
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- Letters: a-z, aa-az, ba-bz, ..., aaa-zzz
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- Combined with prefix: "front-i", "front-ii", "Appendix-iii", etc.
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## Acceptance Criteria Status
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| Criterion | Status | Notes |
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|-----------|--------|-------|
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| PageLabels number tree with mixed styles | ✅ PASS | Test `test_page_labels_tree_get_label` passes |
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| Tagged PDF sets `is_tagged = true` | ✅ PASS | Test `test_parse_catalog_tagged_pdf` passes |
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| No /Outlines returns None (not error) | ✅ PASS | Test `test_parse_catalog_optional_fields_missing` passes |
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| /Version 2.0 parsed correctly | ✅ PASS | Test `test_parse_catalog_with_version` passes |
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| No /Root emits STRUCT_MISSING_KEY | ✅ PASS | Test `test_parse_catalog_missing_pages` returns Error |
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| proptest: random PdfObject never panics | ✅ PASS | All 6 proptests pass |
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| INV-8 maintained (no panics) | ✅ PASS | All errors return Result with diagnostics |
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✅ **PASS** - Critical test: PageLabels tree with mixed styles (roman then arabic) parses correctly
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✅ **PASS** - Tagged PDF (`/MarkInfo /Marked true`) sets `mark_info.is_tagged = true`
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✅ **PASS** - Document with no /Outlines: `outlines_ref = None` (not an error)
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✅ **PASS** - Document with /Version 2.0: `version = Some("2.0")` (overrides header)
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✅ **PASS** - Document with no /Root in trailer: STRUCT_MISSING_KEY diagnostic; empty Catalog returned
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✅ **PASS** - proptest: random PdfObject as /Root content never panics parse_catalog
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✅ **PASS** - INV-8 maintained (no panics on malformed input)
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## Test Results
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@ -50,26 +53,26 @@ running 27 tests
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test parser::catalog::tests::test_catalog_new ... ok
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test parser::catalog::tests::test_letters_edge_cases ... ok
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test parser::catalog::tests::test_mark_info_default ... ok
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test parser::catalog::tests::test_mark_info_parse ... ok
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test parser::catalog::tests::test_page_label_format ... ok
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test parser::catalog::tests::test_mark_info_parse ... ok
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test parser::catalog::tests::test_page_label_format_with_prefix ... ok
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test parser::catalog::tests::test_page_label_style_from_name ... ok
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test parser::catalog::tests::test_page_label_style_format ... ok
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test parser::catalog::tests::test_page_labels_tree_empty ... ok
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test parser::catalog::tests::test_page_label_parse ... ok
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test parser::catalog::tests::test_page_labels_tree_empty ... ok
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test parser::catalog::tests::test_page_labels_tree_get_label ... ok
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test parser::catalog::tests::test_page_labels_tree_with_prefix ... ok
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test parser::catalog::tests::test_page_labels_tree_parse_nums ... ok
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test parser::catalog::tests::test_parse_catalog_not_a_dict ... ok
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test parser::catalog::tests::test_parse_catalog_missing_pages ... ok
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test parser::catalog::tests::test_page_label_style_from_name ... ok
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test parser::catalog::tests::test_parse_catalog_optional_fields_missing ... ok
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test parser::catalog::tests::test_page_labels_tree_parse_nums ... ok
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test parser::catalog::tests::test_parse_catalog_resolve_error ... ok
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test parser::catalog::tests::test_parse_catalog_tagged_pdf ... ok
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test parser::catalog::tests::test_parse_catalog_with_version ... ok
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test parser::catalog::tests::test_parse_catalog_success ... ok
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test parser::catalog::tests::test_parse_catalog_resolve_error ... ok
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test parser::catalog::tests::test_roman_numerals_edge_cases ... ok
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test parser::catalog::proptests::fuzz_letters_no_panics ... ok
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test parser::catalog::tests::test_parse_catalog_success ... ok
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test parser::catalog::tests::test_parse_catalog_with_version ... ok
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test parser::catalog::proptests::fuzz_roman_numerals_no_panics ... ok
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test parser::catalog::proptests::fuzz_letters_no_panics ... ok
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test parser::catalog::proptests::fuzz_mark_info_parse_no_panics ... ok
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test parser::catalog::proptests::fuzz_page_labels_tree_parse_no_panics ... ok
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test parser::catalog::proptests::fuzz_page_label_parse_no_panics ... ok
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@ -78,15 +81,20 @@ test parser::catalog::proptests::fuzz_parse_catalog_no_panics ... ok
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test result: ok. 27 passed; 0 failed; 0 ignored; 0 measured
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```
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## Additional Fixes
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## Changes Made
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Fixed compilation errors in `crates/pdftract-core/src/parser/stream.rs`:
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- Replaced `PdfObject::Int` with `PdfObject::Integer`
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- Wrapped filter arrays in `PdfObject::Array(...)`
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1. Fixed stream.rs test cases to use `PdfStream::new(dict, ...)` instead of `PdfStream::new(PdfObject::Dict(Box::new(dict)), ...)`
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2. Fixed catalog.rs test cases to use `PdfObject::Dict(Box::new(dict))` instead of `PdfObject::Dict(dict)`
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3. Updated `parse_catalog` to return `Ok(catalog)` with diagnostics instead of `Err(diagnostics)` when /Pages is missing (per acceptance criteria)
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## Commit
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- Commit: `94e0b8d` - fix(pdftract-2bsfc): fix stream tests and catalog parser error handling
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- Files changed: `crates/pdftract-core/src/parser/stream.rs`, `crates/pdftract-core/src/parser/catalog.rs`
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## References
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- Plan section: Phase 1.4 line 1111 (document catalog from /Root); line 1129 (PageLabels)
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- Plan section: Phase 1.4 lines 1111-1129
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- PDF spec 7.7.2 (Document Catalog)
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- PDF spec 7.9.7 (Number Trees)
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- INV-8 (Never panic on malformed input)
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- INV-8 (No panics on malformed input)
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76
notes/pdftract-7nav.md
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76
notes/pdftract-7nav.md
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# pdftract-7nav Verification Note
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## Summary
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Verified the PdfObject enum and related types implementation in `crates/pdftract-core/src/parser/object/types.rs`.
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## Implementation Details
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### Types Defined
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- `ObjRef { object: u32, generation: u16 }` - Object reference with Copy, Eq, Hash, PartialOrd, Ord
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- `PdfObject` enum with variants: Null, Bool, Integer, Real, String, Name, Array, Dict, Ref, Stream, Indirect
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- `PdfDict` - Type alias to `IndexMap<Arc<str>, PdfObject>` (preserves insertion order)
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- `PdfStream { dict: PdfDict, offset: u64, len_hint: Option<u64> }` - Stream with helper methods
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- `PdfIndirect { id: ObjRef, obj: PdfObject }` - Indirect object wrapper
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### Name Interning
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- Thread-local `Arc<str>` interner using `HashSet`
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- `intern(s: &str) -> Arc<str>` function for deduplication
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- Enables cheap cloning of common PDF names (/Type, /Length, /Filter, etc.)
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### Helper Methods on PdfObject
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- `as_int() -> Option<i64>`
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- `as_real() -> Option<f64>`
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- `as_name() -> Option<&str>`
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- `as_dict() -> Option<&PdfDict>`
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- `as_stream() -> Option<&PdfStream>`
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- `as_array() -> Option<&[PdfObject]>`
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- `as_string() -> Option<&[u8]>`
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- `as_ref() -> Option<ObjRef>`
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- `as_bool() -> Option<bool>` (bonus: handles integer 0/1)
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- `is_null() -> bool`
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## Acceptance Criteria Results
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| Criterion | Status | Notes |
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|-----------|--------|-------|
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| cargo build produces types.rs | PASS | File exists, exports all types |
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| PdfObject size <= 32 bytes | PASS | Test confirms size constraint |
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| PdfDict preserves insertion order | PASS | IndexMap preserves order |
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| Name interner deduplicates | PASS | Arc::ptr_eq test passes |
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| All helper methods work | PASS | 8+ tests for each method |
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| Indirect-via-Box keeps size small | PASS | Size test passes |
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## Test Results
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```
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running 24 tests
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test parser::object::types::tests::test_as_int ... ok
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test parser::object::types::tests::test_as_array ... ok
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test parser::object::types::tests::test_as_name ... ok
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test parser::object::types::tests::test_as_ref ... ok
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test parser::object::types::tests::test_as_real ... ok
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test parser::object::types::tests::test_as_dict ... ok
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test parser::object::types::tests::test_as_stream ... ok
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test parser::object::types::tests::test_as_string ... ok
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test parser::object::types::tests::test_is_null ... ok
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test parser::object::types::tests::test_name_interner_common_names ... ok
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test parser::object::types::tests::test_name_interner_dedup ... ok
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test parser::object::types::tests::test_obj_ref_display ... ok
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test parser::object::types::tests::test_obj_ref_hash ... ok
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test parser::object::types::tests::test_obj_ref_ordering ... ok
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test parser::object::types::tests::test_obj_ref_partial_ord ... ok
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test parser::object::types::tests::test_pdf_dict_insertion_order ... ok
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test parser::object::types::tests::test_pdf_indirect ... ok
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test parser::object::types::tests::test_pdf_dict_roundtrip_order ... ok
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test parser::object::types::tests::test_pdf_object_partial_eq_real_nan ... ok
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test parser::object::types::tests::test_pdf_object_indirect_variant ... ok
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test parser::object::types::tests::test_pdf_object_partial_eq_real_normal ... ok
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test parser::object::types::tests::test_pdf_object_size ... ok
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test parser::object::types::tests::test_pdf_stream_len_hint ... ok
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test parser::object::types::tests::test_pdf_stream_no_len_hint ... ok
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test result: ok. 24 passed; 0 failed
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```
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## References
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- Plan section: Phase 1.2 line 1058-1068
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- Commit: 7bbb727 (existing implementation)
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