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pdftract/notes/pdftract-c4gmq.md
jedarden 83e83b3cb3 docs(pdftract-c4gmq): Add Phase 1 coordinator close verification note 
All 8 sub-phase coordinators closed. Core PDF parser complete.
2026-06-03 13:31:23 -04:00

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Phase 1 Coordinator Close Verification

Bead: pdftract-c4gmq - Phase 1: Core PDF Parser (Foundation) Date: 2026-06-03 Status: CLOSED

Overview

Phase 1 delivers the pdftract-core::parser module — a complete PDF parsing infrastructure capable of parsing any PDF object, resolving xref tables, decoding streams, and handling remote sources. This foundation enables all higher-level features (text extraction, schema export, SDK generation).

Sub-phase Coordinators (All Closed ✓)

ID Sub-phase Status Description
pdftract-3csx 1.1 Lexer CLOSED Tokenize raw byte slice into PDF tokens
pdftract-54pt 1.2 Object Parser CLOSED Parse token stream into PDF object model
pdftract-4m8u 1.3 Cross-Reference Resolution CLOSED 4 strategies + incremental updates + linearization
pdftract-4mdfv 1.4 Document Model CLOSED Catalog, page tree, encryption, OCG, JS, conformance
pdftract-4fsnb 1.5 Stream Decoder CLOSED 9 filters + filter pipeline + 2 GB bomb limit
pdftract-5n2lu 1.6 Error Recovery CLOSED Cross-cutting strategies for malformed files
pdftract-22vzm 1.7 PDF Structural Fingerprint CLOSED Reproducible 256-bit content hash
pdftract-6096u 1.8 Remote Source Adapter CLOSED HTTP Range reads + PdfSource trait

Acceptance Criteria Status

PASS ✓

  • All 8 sub-phase coordinators closed
  • pdftract-core::parser module compiles standalone
  • All Phase 1 critical tests pass (per sub-phase verification notes):
    • Lexer escapes (EC-01, EC-02)
    • Hex strings odd-length handling
    • Object streams
    • Circular ref detection
    • Xref recovery strategies
    • FlateDecode predictors
    • Stream decompression bomb limit
    • Fingerprint reproducibility
    • Remote Range fetch

Key Deliverables

  1. Core parsing infrastructure — crates/pdftract-core/src/parser/

    • Lexer: lexer.rs, token.rs
    • Object parser: object.rs, indirect_object.rs
    • Xref resolution: xref.rs, hint_stream.rs
    • Stream decoder: stream.rs with all 9 filters

  2. Document model — crates/pdftract-core/src/document.rs

    • Catalog traversal
    • Page tree with inheritance
    • Encryption support (RC4, AES-128, AES-256)
    • OCG configuration
    • JavaScript detection
    • PDF conformance detection
    • Outline extraction

  3. Fingerprinting — crates/pdftract-core/src/fingerprint/

    • Reproducible 256-bit content hash
    • ADR-008 exclusion rules applied
    • pdftract hash subcommand in CLI

  4. Remote sources — crates/pdftract-core/src/source/

    • PdfSource trait abstraction
    • HTTP Range request support
    • LRU cache for remote fetches

  5. Error recovery — cross-cutting INV-3 and INV-8 invariants

    • No panics in library code
    • Graceful degradation for malformed PDFs

Integration Points

  • Phase 2 (Font Pipeline): Unblocked — text extraction can now build on parsed document structure
  • Phase 3 (Schema Export): Unblocked — schema gen has complete document model to serialize
  • Phase 7 (Structure extraction): Unblocked — StructTree parser has doc model to traverse

References

  • Plan: /home/coding/pdftract/docs/plan/plan.md Phase 1 (lines covering all 1.1-1.8)
  • ADR-008: Fingerprint exclusions
  • INV-3: No panics in library code
  • INV-8: Graceful degradation

Conclusion

Phase 1 is complete. The core PDF parser is production-ready and all acceptance criteria pass.