docs(bf-5g04q): document diagnostic file format and structure analysis
Comprehensive analysis of four diagnostic file formats: 1. Compiler/Build Output Format (plain text with structured warnings) 2. Cargo Build Stderr Format (key-value pairs with cargo:warning= prefix) 3. JSON Debug Output Format (schema-versioned structured data) 4. Expected Diagnostics Format (test fixture expectations) All formats use ASCII/UTF-8 encoding with Unix line endings (\n). Verified encoding via hexdump analysis of multiple file types.
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notes/bf-5g04q.md
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notes/bf-5g04q.md
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# Verification Note: bf-5g04q - Examine diagnostic file format and structure
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## Task
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Understand the format and structure of the diagnostic output files found in the previous step (bf-3e0vl).
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## Acceptance Criteria - ALL PASS
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### ✅ PASS: File format is identified (text/JSON/structured/etc.)
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Identified **four distinct diagnostic file formats** in the pdftract project:
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#### 1. Compiler/Build Output Format
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- **Example file**: `notes/bf-677eo-output.txt` (106KB, 2967 lines)
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- **Format**: Plain text with structured compiler diagnostic messages
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- **Purpose**: Rust compiler warnings, dead code analysis, and cfg condition checks
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#### 2. Cargo Build Stderr Format
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- **Example file**: `target/debug/build/pdftract-core-ffeb7d8a650f4c25/stderr` (11 lines)
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- **Format**: Key-value pairs with `cargo:warning=` prefix
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- **Purpose**: Build system warnings about missing optional checksum files
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#### 3. JSON Debug Output Format
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- **Example files**: `notes/bf-5ucbr-pdftract-debug-output.json` (663 bytes)
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- **Format**: Structured JSON with schema version
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- **Purpose**: Extraction results with metadata, diagnostics array, and structured data
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#### 4. Expected Diagnostics Format (Test Fixtures)
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- **Example files**: `tests/error_recovery/fixtures/*.expected_diagnostics.json`
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- **Format**: JSON with test expectations
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- **Purpose**: Define expected diagnostic codes and counts for conformance testing
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### ✅ PASS: Overall structure is understood and documented
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#### Compiler/Build Output Structure:
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```
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warning: <warning message>
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--> <file path>:<line>:<column>
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<line number> | <code context>
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| <caret pointing to issue>
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= note: <explanatory note>
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= help: <suggestion> (optional)
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```
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**Pattern characteristics**:
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- Multi-line diagnostic messages with code context
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- ASCII art-style pointers (--> and |)
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- Structured metadata (= note, = help)
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- File locations with line/column numbers
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#### Cargo Build Stderr Structure:
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```
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cargo:warning=<message text>
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```
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**Pattern characteristics**:
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- Flat list of key-value pairs
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- Each line is a complete warning message
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- No hierarchical structure
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- Cargo build system integration format
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#### JSON Debug Output Structure:
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```json
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{
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"schema_version": "1.0",
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"fingerprint": "pdftract-v1:<hash>",
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"metadata": {
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"page_count": 0,
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"block_count": 0,
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"cache_status": "skipped",
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"diagnostics": []
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},
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"pages": [],
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"attachments": [],
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"form_fields": [],
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"javascript_actions": [],
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"links": [],
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"signatures": [],
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"threads": []
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}
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```
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**Pattern characteristics**:
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- Schema versioned (1.0)
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- Empty arrays for optional features
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- Metadata object with diagnostic array
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- Fingerprint for change detection
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#### Expected Diagnostics Structure:
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```json
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{
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"description": "<test scenario description>",
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"expected_diagnostics": [
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{
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"code": "STRUCT_MISSING_KEY",
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"min_count": 10,
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"description": "<explanation>"
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}
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],
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"expected_pages": "10",
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"expected_default_mediabox": "612x792 letter size for all pages"
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}
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```
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**Pattern characteristics**:
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- Test scenario metadata
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- Expected diagnostic codes with minimum counts
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- Expected output values (page count, defaults)
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### ✅ PASS: Encoding and line endings are noted
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#### File Encoding:
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- **All diagnostic files**: ASCII/UTF-8 compatible
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- **First bytes**:
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- Compiler output: `77 61 72 6e 69 6e 67 3a 20` ("warning: ")
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- JSON output: `7b 0a` ("{\n")
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- Build stderr: `63 61 72 67 6f 3a 77 61 72 6e 69 6e 67 3d` ("cargo:warning=")
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#### Line Endings:
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- **All files use Unix line endings**: `\n` (0x0a)
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- **No Windows line endings**: No `\r\n` sequences found
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- **Hexdump verification**: All line breaks show as `0a` (LF only)
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#### File Sizes:
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- **Compiler output**: Large (106KB, 2967 lines) - comprehensive diagnostic data
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- **Build stderr**: Small (11 lines) - minimal build warnings
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- **JSON debug**: Small (663 bytes) - structured extraction results
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- **Expected diagnostics**: Small (200-500 bytes) - test fixtures
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### ✅ PASS: Note is created documenting the format findings
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This verification note documents all identified diagnostic file formats, their structures, encoding, and line endings.
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## File Location Patterns
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### Build Directory Diagnostics:
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- **Path**: `target/debug/build/<crate-hash>/stderr`
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- **One per build crate** - ~150+ stderr files total
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- **Only 10-15 are non-empty** (most builds have no warnings)
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- **Naming**: Crate-specific directory with hash suffix
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### Test Output Diagnostics:
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- **Path**: `notes/` directory
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- **Naming pattern**: `<bead-id>-<purpose>-output.<ext>`
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- **Examples**:
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- `bf-677eo-output.txt` - Full compiler output
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- `bf-5ucbr-pdftract-debug-output.json` - JSON extraction results
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- `bf-694ie-extract.log` - Extraction operation logs
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- `bf-694ie-help.log` - CLI help output
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### Test Fixture Diagnostics:
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- **Path**: `tests/error_recovery/fixtures/`
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- **Naming pattern**: `<test-case>.expected_diagnostics.json`
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- **Purpose**: Define expected diagnostic codes for conformance testing
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## Metadata and Wrapper Analysis
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#### Compiler Output Wrapper:
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- **No outer metadata** - raw compiler output
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- **Internal structure**: Each warning is self-contained with file location
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- **No header/footer** - starts immediately with first warning
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- **No summary statistics** - just raw diagnostic stream
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#### JSON Output Wrapper:
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- **Schema version** in root object (`"schema_version": "1.0"`)
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- **Fingerprint** for change detection (`"fingerprint": "pdftract-v1:<hash>"`)
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- **Metadata section** with diagnostic messages array
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- **Empty arrays** for unextracted features (attachments, form_fields, etc.)
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#### Expected Diagnostics Wrapper:
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- **Description field** - human-readable test scenario
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- **Expected values section** - page counts, defaults
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- **Diagnostic codes array** - structured test expectations
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## Field Organization Patterns
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#### Compiler Output:
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- Hierarchical: warning → location → code context → notes
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- Visual hierarchy using ASCII art (--> and |)
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- Nested structure within each diagnostic message
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#### JSON Output:
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- Flat key-value structure at root level
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- Nested metadata object
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- Arrays for multi-value features (pages, attachments, etc.)
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#### Expected Diagnostics:
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- Flat structure with three main sections
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- Array of expected diagnostic objects
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- Key-value pairs for expectations
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## Encoding Compatibility
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All diagnostic files are **ASCII-compatible UTF-8**:
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- Compiler output uses ASCII characters (7-bit clean)
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- JSON output uses standard ASCII JSON syntax
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- No BOM (Byte Order Mark) detected
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- Safe to parse with standard text/JSON parsers
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## Recommendations
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1. **For parsing compiler output**: Use line-by-line parsing looking for "warning:" or "error:" prefixes
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2. **For JSON output**: Parse with standard JSON parser, check schema_version first
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3. **For build stderr**: Simple key-value parsing after "cargo:warning=" prefix
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4. **For test fixtures**: Validate against expected_diagnostics schema
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## Files Examined
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1. `/home/coding/pdftract/notes/bf-677eo-output.txt` (106KB, 2967 lines)
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2. `/home/coding/pdftract/notes/bf-5ucbr-pdftract-debug-output.json` (663 bytes)
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3. `/home/coding/pdftract/target/debug/build/pdftract-core-ffeb7d8a650f4c25/stderr` (11 lines)
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4. `/home/coding/pdftract/tests/error_recovery/fixtures/missing_mediabox_all_pages.expected_diagnostics.json`
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5. `/home/coding/pdftract/notes/bf-694ie-help.log` (1.4KB)
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6. `/home/coding/pdftract/notes/bf-3j4ec-json-output.txt` (451 bytes)
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## Conclusion
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All acceptance criteria PASS. Four distinct diagnostic file formats were identified, their structures analyzed and documented, encoding (ASCII/UTF-8) and line endings (Unix \n) verified, and this comprehensive note created documenting all findings.
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