Implement per-word validation filter for assisted-OCR BrokenVector path.
Changes:
- Add SpanSource::OcrAssisted variant to hybrid.rs
- Add Span::ocr_assisted() helper method
- Implement validate_ocr_with_position_hints() in ocr.rs
- 5pt distance threshold for position validation
- 0.4 confidence cap for rejected words
- Linear scan for nearest-neighbor lookup
- Add unit tests for validation filter
Closes: pdftract-3s2i
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
- Fix Token::Keyword to use b"..." .to_vec() instead of static strings
- Improve unknown keyword diagnostics to show actual keyword bytes
- Remove unused has_valid_line_ending variable in stream keyword lexer
- Add stream_header_valid_line_endings test for stream keyword validation
All hex string lexer tests pass (16 unit tests + 2 proptests).
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
Bead-Id: pdftract-2hm4
Add verify_receipt method support to Go templates:
- client.go.tera: Add verify_receipt with string params (path, receipt)
- conformance_test.go.tera: Add testVerifyReceipt test case
Code generator cleanup:
- Add uses_string_params and string_param_count to Method struct
- Fix unused variable warnings in contract parsing
- Document TODO for full markdown contract parsing
Verification:
- All 9 methods generated correctly (extract, extract_text, extract_markdown, extract_stream, search, get_metadata, hash, classify, verify_receipt)
- All 7 error types generated with exit code mapping
- Drift detection working (validate command)
- Protection against overwriting hand-written code (GENERATED marker)
See notes/pdftract-1534.md for full acceptance criteria status.
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
Two fixes:
1. Hex string lexer now flushes dangling nibble when encountering invalid
characters. For `<4X8Y>`, the X and Y are invalid, so we flush nibble 4
as 0x40, then flush nibble 8 as 0x80, producing `\x40\x80`.
2. Fixed skip_whitespace_and_comments() to properly handle whitespace
after comments. The previous logic only continued looping if the next
byte was `%`, missing cases where whitespace follows a comment.
All 52 lexer tests pass.
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
