docs(pdftract-dejqs): add verification note for per-page resource inheritance
Verifies that the per-page Resource dictionary inheritance implementation is complete and correct. All acceptance criteria are met: - 3-level resource inheritance test passes - Per-key override test passes - /Resources missing on page inherits parent's - Arc<ResourceDict> sharing verified with Arc::ptr_eq - ColorSpace inline-array test passes - Empty root /Resources propagates correctly - INV-8 maintained (all fuzz tests pass) Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
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notes/pdftract-32qkr.md
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# pdftract-32qkr: Java/Kotlin SDK Implementation
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## Summary
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Implemented the `com.jedarden:pdftract` Maven artifact as a subprocess-based SDK. The SDK spawns the bundled `pdftract` binary via `ProcessBuilder`, parses JSON output via Jackson, and exposes all 9 contract methods on an `AutoCloseable Pdftract` client. Kotlin extension functions are bundled in the same artifact for idiomatic Kotlin syntax.
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## What Was Done
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### 1. Project Structure Created
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- **Location**: `github.com/jedarden/pdftract-java` (separate repo)
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- **Maven coordinates**: `com.jedarden:pdftract:0.1.0`
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- **Java version**: 17 (minimum required)
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- **Build system**: Maven with mixed Java/Kotlin compilation
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### 2. Main Client Class (`Pdftract.java`)
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- Implements `AutoCloseable` for try-with-resources pattern
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- 9 contract methods implemented:
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1. `extract(Source, ExtractOptions) -> Document`
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2. `extractText(Source, ExtractOptions) -> String`
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3. `extractMarkdown(Source, ExtractOptions) -> String`
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4. `extractStream(Source, ExtractOptions) -> Stream<Page>`
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5. `search(Source, String, SearchOptions) -> Stream<Match>`
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6. `getMetadata(Source, BaseOptions) -> Metadata`
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7. `hash(Source, BaseOptions) -> Fingerprint`
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8. `classify(Source) -> Classification`
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9. `verifyReceipt(Path, Receipt) -> boolean`
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### 3. Data Types (Java Records)
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All types are implemented as Java records with null-safe constructors:
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- `Document`, `Page`, `Block`, `Line`, `Span`
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- `DocumentMetadata`, `Metadata`, `Fingerprint`
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- `Match`, `Classification`, `ProcessingError`, `Receipt`
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### 4. Source Types (Sealed Interface)
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- `Source` - sealed interface with factory methods
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- `PathSource` - local file paths
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- `UrlSource` - remote URLs
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- `BytesSource` - raw bytes (writes to temp file)
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### 5. Exception Hierarchy (7 classes)
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All inherit from `PdftractException`:
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- `PdftractException` (base, exit code -1)
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- `CorruptPdfException` (exit code 2)
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- `EncryptionException` (exit code 3)
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- `SourceUnreachableException` (exit code 4)
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- `RemoteFetchInterruptedException` (exit code 5)
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- `TlsException` (exit code 6)
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- `ReceiptVerifyException` (exit code 10)
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### 6. Options Classes
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- `BaseOptions` - password, timeout (with covariant return types)
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- `ExtractOptions` - OCR settings, layout, image extraction
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- `SearchOptions` - max results, whole word matching
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### 7. Kotlin Extensions (`PdftractExt.kt`)
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- Lambda-based options syntax: `extract(path) { ocrLanguage = "eng" }`
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- Invoke operator: `pdftract { ... }`
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- Path/URL/bytes overloads for convenience
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- Stream to Sequence conversion
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### 8. JSON Configuration
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- `Json.mapper()` configured with:
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- `FAIL_ON_UNKNOWN_PROPERTIES` (catch schema changes early)
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- `NON_NULL` serialization inclusion
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### 9. Tests
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- `PdftractTest.java` - 17 unit tests (structure verification)
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- `AutoCloseableTest.java` - 9 tests (cleanup behavior)
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- `ConformanceTest.java` - SDK conformance runner
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## Acceptance Criteria Status
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| Criterion | Status | Notes |
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|-----------|--------|-------|
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| `mvn package` builds | ✅ PASS | JAR built successfully |
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| 9 contract methods | ✅ PASS | All implemented with correct signatures |
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| 8 exception classes | ⚠️ WARN | 7 classes (matches contract - only 7 exit codes specified) |
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| Document/Page as records | ✅ PASS | All types are Java records |
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| Kotlin extensions | ✅ PASS | Idiomatic syntax in same jar |
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| `mvn test` 100% pass | ⚠️ WARN | Conformance tests blocked by incomplete CLI |
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| AutoCloseable cleanup | ✅ PASS | Tests pass, subprocess cleanup verified |
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## Known Limitations
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1. **CLI Implementation**: The pdftract CLI is not fully implemented yet:
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- OCR options (`--ocr-language`, `--ocr-threshold`) not available
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- Commands `grep`, `hash`, `classify`, `verify-receipt` not implemented
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- Conformance tests will pass once CLI is complete
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2. **Future Optimizations**: The current implementation spawns a subprocess per call. The design supports future optimization via `pdftract serve` over Unix socket.
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## Files Modified/Created
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**Created** (33 source files):
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- `src/main/java/com/jedarden/pdftract/` - 22 Java files
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- `src/main/java/com/jedarden/pdftract/codegen/` - 7 Java files
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- `src/main/kotlin/com/jedarden/pdftract/` - 1 Kotlin file
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- `src/test/java/com/jedarden/pdftract/` - 3 test files
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- `pom.xml` - Maven build configuration
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- `README.md` - Comprehensive documentation
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- `LICENSE` - MIT license
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## Build Verification
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```bash
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# Compile
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nix-shell -p maven --run "mvn compile"
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# Result: BUILD SUCCESS
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# Package
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nix-shell -p maven --run "mvn package -DskipTests"
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# Result: BUILD SUCCESS, JAR created at target/pdftract-0.1.0.jar
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# Unit tests
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nix-shell -p maven --run "mvn test -Dtest=PdftractTest,AutoCloseableTest"
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# Result: 26 tests passed, 0 failed
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```
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## Next Steps
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1. Complete CLI implementation for full conformance test coverage
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2. Set up OSSRH account and GPG key for Maven Central publishing
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3. Create `pdftract-java-publish` Argo workflow template
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4. Add integration tests once CLI is fully implemented
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## References
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- Plan: SDK Architecture / The Ten SDKs, line 3475
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- Plan: SDK Architecture / Per-SDK Release Channels, line 3572
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- Plan: SDK Acceptance Criteria, lines 3581-3589
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122
notes/pdftract-dejqs.md
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# pdftract-dejqs: Per-page Resource Dictionary Inheritance
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## Summary
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Verified that the per-page Resource dictionary inheritance implementation is complete and correct. The implementation was already present in `crates/pdftract-core/src/parser/resources.rs` and integrated into the page tree flattening in `crates/pdftract-core/src/parser/pages.rs`.
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## Implementation Details
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### ResourceDict Structure (`crates/pdftract-core/src/parser/resources.rs`)
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The `ResourceDict` struct contains all resource namespaces:
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- `fonts: IndexMap<Arc<str>, ObjRef>` — /Font namespace
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- `xobjects: IndexMap<Arc<str>, ObjRef>` — /XObject namespace
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- `ext_gstates: IndexMap<Arc<str>, ObjRef>` — /ExtGState namespace
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- `color_spaces: IndexMap<Arc<str>, PdfObject>` — /ColorSpace namespace (supports inline arrays)
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- `shadings: IndexMap<Arc<str>, ObjRef>` — /Shading namespace
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- `patterns: IndexMap<Arc<str>, ObjRef>` — /Pattern namespace
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- `properties: IndexMap<Arc<str>, ObjRef>` — /Properties namespace
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- `proc_set: Vec<Arc<str>>` — /ProcSet (deprecated, informational only)
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### merge_resources Function
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The `merge_resources(ancestor: &ResourceDict, child: &PdfObject) -> ResourceDict` function implements per-namespace merging with per-key last-write-wins semantics:
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1. Starts with a clone of the ancestor's ResourceDict
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2. For each namespace in the child's /Resources:
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- Merges the child's entries into the ancestor's entries
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- Per-key last-write-wins: if child has the same key as ancestor, child's value wins
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- Different keys are accumulated (not replaced)
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3. Returns the merged ResourceDict
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### Page Tree Integration (`crates/pdftract-core/src/parser/pages.rs`)
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The `InheritedAttrs` struct tracks the accumulated ResourceDict during page tree traversal:
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- `merge_inherited_attrs()`: Merges /Resources from /Pages nodes into the accumulator
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- `build_page_dict()`: Merges /Resources from leaf /Page nodes and stores the result in `PageDict.resources: Arc<ResourceDict>`
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- When a page has no /Resources, it inherits the parent's Arc (memory efficiency via Arc::ptr_eq)
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## Acceptance Criteria Verification
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### ✅ 1. Critical test: 3-level resource inheritance
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Tests: `test_resource_inheritance_three_level` (pages.rs), `test_three_level_inheritance` (resources.rs)
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The 3-level inheritance test creates:
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- Grandparent /Pages with /F1 and /Im1
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- Parent /Pages adds /F2
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- Page 1 adds /F3 and overrides /F1
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- Page 2 has no /Resources (inherits all)
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Result: Page 1 has F1 (overridden), F2 (inherited), F3 (new), Im1 (inherited). Page 2 has F1, F2, Im1 (all inherited).
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### ✅ 2. Per-key override test
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Test: `test_merge_fonts_last_write_wins` (resources.rs)
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Verifies that when a page declares `/Font << /F1 >>`, the F1 on the page overrides F1 on the ancestor (last-write-wins per-key).
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### ✅ 3. /Resources missing on page: inherits parent's
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Tests: `test_resource_inheritance_page_without_resources` (pages.rs), `test_merge_null_child_returns_ancestor` (resources.rs)
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When a page has no /Resources, it inherits the parent's ResourceDict. The test verifies that the inherited resources are present and accessible.
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### ✅ 3b. Arc<ResourceDict> is the SAME instance (Arc::ptr_eq)
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Test: `test_resource_inheritance_arc_sharing` (pages.rs)
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When multiple pages have no /Resources, they share the same Arc<ResourceDict> instance for memory efficiency. The test uses `Arc::ptr_eq()` to verify this.
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### ✅ 4. ColorSpace inline-array test
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Test: `test_merge_colorspace_inline_array` (resources.rs)
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Verifies that ColorSpace values can be inline arrays (not just refs). The test creates an inline CalRGB color space array and verifies it's preserved in the merged dict.
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### ✅ 5. Empty root /Resources: empty ResourceDict propagates
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Test: `test_resource_inheritance_empty_root` (pages.rs)
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When the root /Pages has an empty /Resources dict, the empty ResourceDict propagates to all leaf pages. The test verifies that the page's resources are empty.
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### ✅ 6. INV-8 maintained: no panics on arbitrary input
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Tests: All fuzz tests in `proptests` modules (pages.rs, resources.rs, catalog.rs, outline.rs, ocg.rs)
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The property tests verify that:
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- `fuzz_parse_rect_no_panics`: parse_rect never panics on arbitrary arrays
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- `fuzz_build_page_dict_no_panics`: build_page_dict never panics on arbitrary input
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- `fuzz_flatten_page_tree_no_panics`: flatten_page_tree handles arbitrary /Pages structures
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- `fuzz_rotate_clamping_no_panics`: arbitrary rotate values are handled without panicking
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## Test Results
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All 18 resource-related tests pass:
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- `test_empty_resource_dict`
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- `test_resource_dict_not_empty`
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- `test_merge_fonts_last_write_wins`
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- `test_merge_xobjects`
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- `test_merge_colorspace_inline_array`
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- `test_merge_procset_dedup`
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- `test_merge_null_child_returns_ancestor`
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- `test_three_level_inheritance`
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- `test_merge_all_namespaces`
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All 26 page tree tests pass:
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- `test_resource_inheritance_three_level`
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- `test_resource_inheritance_page_without_resources`
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- `test_resource_inheritance_arc_sharing`
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- `test_resource_inheritance_empty_root`
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- ... and 22 other page tree tests
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All 16 fuzz tests pass:
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- `fuzz_parse_rect_no_panics`
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- `fuzz_build_page_dict_no_panics`
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- `fuzz_flatten_page_tree_no_panics`
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- `fuzz_rotate_clamping_no_panics`
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- ... and 12 other fuzz tests
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## Conclusion
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The per-page Resource dictionary inheritance implementation is complete and correct. All acceptance criteria are met, and the tests cover the critical cases including 3-level inheritance, per-key override, Arc sharing, ColorSpace inline arrays, empty root /Resources, and INV-8 (no panics on arbitrary input).
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