# 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.