docs(pdftract-34hxw): verify AcroForm Tx text field value extraction complete
The implementation in value_text.rs already handles all requirements: - TextValue struct with value, default, multiline, max_length fields - PDFDocEncoding and UTF-16BE BOM decoding - All 12 tests passing - Proper integration into FormFieldValue enum No code changes required. All acceptance criteria PASS. Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
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notes/pdftract-34hxw.md
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# pdftract-34hxw: AcroForm Tx (text field) value extraction
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## Status: PASS (implementation already present)
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## Summary
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The AcroForm /Tx (text field) value extraction is already fully implemented in `crates/pdftract-core/src/forms/value_text.rs`. The implementation correctly handles all requirements from the bead description.
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## Implementation Verification
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### Module Location
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- **File:** `crates/pdftract-core/src/forms/value_text.rs` (737 lines)
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- **Exports:** `TextValue` struct and `extract_text_value` function
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- **Re-exports in:** `crates/pdftract-core/src/forms/mod.rs`
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### TextValue Struct
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```rust
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pub struct TextValue {
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pub value: Option<String>, // Current value (/V)
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pub default: Option<String>, // Default value (/DV)
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pub multiline: bool, // /Ff bit 12 (1<<12 = 0x1000)
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pub max_length: Option<u32>, // /MaxLen (negative → None)
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}
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```
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### FormFieldValue::Text Variant
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The `FormFieldValue::Text` variant is properly defined in `combiner.rs`:
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```rust
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pub enum FormFieldValue {
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Text {
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value: Option<String>,
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default: Option<String>,
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multiline: bool,
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max_length: Option<u32>,
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},
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// ... other variants
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}
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```
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### PDFDocEncoding/UTF-16BE Decoding
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The `decode_pdf_string()` function correctly implements:
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1. UTF-16BE BOM detection (`0xFE 0xFF` prefix)
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2. UTF-16BE decoding (with and without BOM)
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3. PDFDocEncoding fallback (full 29-character override table from PDF spec Annex D.2)
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4. Heuristic UTF-16BE detection for malformed inputs
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### Acceptance Criteria Status
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| Criterion | Status | Notes |
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|-----------|--------|-------|
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| Text field with /V → FormFieldValue::Text { value: Some(...), ... } | ✅ PASS | `test_extract_text_value_basic` |
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| UTF-16BE BOM-prefixed /V → correct Unicode decode | ✅ PASS | `test_extract_text_value_utf16be_bom` |
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| /Ff multiline bit set → multiline: true | ✅ PASS | `test_extract_text_value_multiline` |
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| /MaxLen 50 → max_length: Some(50) | ✅ PASS | `test_extract_text_value_with_max_length` |
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| Empty /V → value: Some("") | ✅ PASS | `test_extract_text_value_empty_value` |
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| Missing /V → value: None | ✅ PASS | `test_extract_text_value_no_value` |
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### Test Results
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All 12 text_value tests passed:
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```
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PASS [ 0.014s] test_extract_text_value_name_as_value
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PASS [ 0.016s] test_extract_text_value_with_max_length
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PASS [ 0.016s] test_extract_text_value_utf16be_bom
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PASS [ 0.017s] test_text_value_empty_constructor
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PASS [ 0.016s] test_extract_text_value_multiline
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PASS [ 0.017s] test_text_value_equality
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PASS [ 0.017s] test_extract_text_value_with_default
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PASS [ 0.018s] test_extract_text_value_basic
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PASS [ 0.018s] test_extract_text_value_no_value
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PASS [ 0.020s] test_extract_text_value_negative_max_length_ignored
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PASS [ 0.020s] test_extract_text_value_combined_flags
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PASS [ 0.021s] test_extract_text_value_empty_value
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Summary [ 0.028s] 12 tests run: 12 passed, 2660 skipped
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```
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### Additional Test Coverage
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The module also includes comprehensive PDFDocEncoding tests:
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- `test_decode_pdf_string_ascii`
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- `test_decode_pdf_string_utf16be_bom`
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- `test_decode_pdf_string_utf16be_bom_odd_length`
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- `test_decode_pdf_string_pdfdocencoding_latin1`
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- `test_decode_pdf_string_pdfdocencoding_lower_latin1`
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- `test_decode_pdf_string_pdfdocencoding_bullet`
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- `test_decode_pdf_string_pdfdocencoding_em_dash`
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- `test_decode_pdf_string_pdfdocencoding_quotes`
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- `test_decode_pdf_string_empty`
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- `test_looks_like_utf16be`
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- `test_extract_string_from_value_unrecognized_type`
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- `test_decode_pdf_string_never_panics`
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- `test_extract_text_value_combined_flags`
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### Integration
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The implementation is properly integrated:
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1. Exported from `forms/mod.rs` as `pub use value_text::{extract_text_value, TextValue}`
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2. Used by `acro_field_to_value()` function for Tx field conversion
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3. Consumed by `combine()` function in combiner.rs
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4. Part of the FormFieldValue enum for JSON serialization
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## Conclusion
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No code changes were required. The implementation is complete, well-tested, and properly integrated into the forms pipeline. All acceptance criteria are met.
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