Michael
38011872e1
README + USER-GUIDE describe the sidebar picker and current coverage (home + shared chrome, per-tool bodies pending). DEVELOPER gains a how-to for adding packs and keys with the parity-test guarantee. TECHNICAL §10b records the in-house-JSON architecture and locks in the no-gettext decision (also logged in DECISIONS). REQUIREMENTS reflects the new interface surface and updated test count. COPY.md adds a "Language claim" slot so landing/email work can pick it up. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
151 lines
6.7 KiB
Markdown
151 lines
6.7 KiB
Markdown
# Requirements
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Numbered support matrix. Updated with every shipped capability.
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## 1. File handling
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1.1 Size: ≤ 1 GB target (larger works, slower).
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1.2 Read: CSV, TSV, XLSX, XLS.
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1.3 Write: CSV, TSV.
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1.4 Excel: multi-sheet picker.
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1.5 Empty file: blocked with `empty_input` error finding.
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## 2. Input encodings (auto-detected)
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2.1 Unicode: UTF-8, UTF-8-BOM, UTF-16 LE/BE BOM, UTF-16 LE no-BOM.
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2.2 Western: cp1252, ISO-8859-1, ISO-8859-15, Mac Roman.
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2.3 Eastern European: cp1250, ISO-8859-2.
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2.4 Cyrillic: cp1251, KOI8-R.
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2.5 CJK: Shift_JIS / cp932, GB18030, Big5, EUC-KR / cp949.
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2.6 ASCII → detected as UTF-8.
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2.7 User override: any Python codec name.
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2.8 BOM: stripped on read, never written.
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2.9 Decode failure → `encoding_decode_failed` (error).
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2.10 U+FFFD in output → `encoding_uncertain` (error).
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## 3. Output encodings
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3.1 UTF-8 (default), UTF-8-BOM (Excel-friendly).
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3.2 cp1252, ISO-8859-1/15, cp1250, ISO-8859-2, cp1251.
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3.3 Shift_JIS, GB18030, Big5, EUC-KR, UTF-16 LE.
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3.4 Lossy fallback: `?` + warning when codec can't represent a char.
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## 4. Delimiters
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4.1 Input auto-detect: `,`, `\t`, `;`, `|`.
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4.2 Output: `,` (default), `\t`, `;`, `|`.
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4.3 Extension: `.tsv` for tab, `.csv` otherwise.
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## 5. Line endings
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5.1 Read: LF / CRLF / bare CR — all normalized to LF.
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5.2 Embedded in quoted cells: also normalized to LF.
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5.3 Write: LF (default), CRLF, CR.
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5.4 Mixed → `mixed_line_endings` finding.
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## 6. Analyzer detectors
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**File-level** (read-time fixes, audit-logged):
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- `csv_bom_stripped`, `csv_nul_stripped`, `csv_smart_quotes_folded`, `csv_line_endings_normalized`, `csv_transcoded_to_utf8`, `csv_unquoted_delimiters_repaired`, `csv_unrepairable_rows`.
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**Cell-level**:
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- `smart_punctuation_in_data`, `nbsp_or_unicode_whitespace`, `zero_width_or_invisible`, `dirty_column_headers`, `whitespace_padding`, `null_like_sentinels`, `suspected_mojibake`, `mixed_case_email_column`, `inconsistent_date_format`, `near_duplicate_rows`, `leading_zero_ids`.
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**Encoding integrity**: `encoding_uncertain`, `encoding_decode_failed`, `encoding_lying_bom`, `empty_input`.
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Sample size: 1,000 rows (configurable).
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## 7. Finding fields
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`id`, `severity` (info/warn/error), `confidence` (high/medium/low), `fix_action`, `pre_applied`, `tool`, `count`, `description`, `column`, `samples` (≤5).
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## 8. Confidence tiers
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- **high** — round-trip safe, one-click auto-fix.
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- **medium** — preview before applying.
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- **low** — opt-in only, can corrupt if wrong.
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- **error** — must resolve or waive before tool pages unlock.
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## 9. Decision actions
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- `auto` — apply registered fix.
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- `skip` — waive (audit-logged).
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- `modified` — apply with custom payload.
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## 10. Performance (1 GB input)
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- Initial scan (sample): < 2 s · peak RSS ~110 MB.
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- Full-file `repair_bytes`: 30–40 s.
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- Full-DataFrame analyze: ~4 min (~25 µs/cell).
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- Full-DataFrame `auto_fix`: ~5 min (~30 µs/cell).
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- Output write: ~10 s.
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- Recommended RAM: 4× input size for full-Apply path.
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- Format standardizer (`standardize_file`): ~150k rows/sec on cache-warm
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international data; chunk-bounded RAM (~50 MB peak at default
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chunk_size=50,000). A 1 GB CSV with mixed phone+currency+address
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columns finishes in ~2.5–10 minutes depending on column count.
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## 11. Tools
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1. Deduplicator — Ready
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2. Text Cleaner — Ready
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3. Format Standardizer — Ready
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4. Missing Value Handler — Ready
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5. Column Mapper — Ready
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6. Outlier Detector — Coming Soon
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7. Multi-File Merger — Coming Soon
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8. Validator & Reporter — Coming Soon
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9. Pipeline Runner — Ready
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### 11.a Recommended pipeline order (soft, not enforced)
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The Pipeline Runner ships with a `SOFT_DEPENDENCIES` table; the
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following ordering is the default and the basis of the warning
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surface. Re-ordering is allowed; the runner emits a warning string
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and proceeds.
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| # | Tool | Why this slot |
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|---|------|---------------|
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| 1 | column_map (optional, for header alignment) | Multi-vendor unification — rename early so downstream tools see canonical headers |
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| 2 | text_clean | NBSP / smart quotes / zero-width pollution silently breaks downstream parsers |
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| 3 | format_standardize | Phones / dates / currencies → canonical form before missing detection and dedup |
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| 4 | missing | Sentinel detection, imputation, drop strategies — needs canonical types |
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| 5 | column_map (optional, for schema enforcement) | Project to target schema, coerce, drop extras AFTER cleaning |
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| 6 | dedup | Fuzzy matching is most accurate on canonicalised, sentinel-laundered data |
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## 12. Gate (Review & Normalize)
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- Gates every tool page.
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- Auto-fix button: applies all `confidence=high` findings in one click.
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- Per-finding controls: Auto / Skip / Customize.
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- Live before/after preview (≤5 sample rows).
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- Audit log per fix (id, decision, cells changed).
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- Encoding-override picker (16 codepages + custom).
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- Advanced output expander: encoding + delimiter + line terminator.
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- Result keyed by upload SHA-256; survives reload, invalidated on re-upload.
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## 13. Interfaces
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- **GUI**: Streamlit, browser-based, local, no internet. Sidebar language picker (English, Español).
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- **CLI**: `python -m src.cli` (dedup) · `src.cli_text_clean` · `src.cli_format` · `src.cli_missing` · `src.cli_column_map` · `src.cli_pipeline` · `src.cli_analyze`. (CLI output is English-only.)
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- **Python API**: `from src.core import …` (analyze, repair_bytes, clean_dataframe, deduplicate, standardize_dataframe, …).
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- **JSON output**: `--json` on `cli_analyze`.
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- **Language packs**: `from src.i18n import t, LANGUAGES`. Add `<code>.json` to `src/i18n/packs/` + entry in `LANGUAGES` to add a language.
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## 14. Platforms
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- Python ≥ 3.10.
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- OS: Linux, macOS, Windows.
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- Browser: any modern browser.
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- Network: not required at runtime.
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## 15. Dependencies
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- **Core**: pandas, openpyxl, charset-normalizer, typer, loguru.
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- **Dedup**: rapidfuzz, phonenumbers.
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- **GUI**: streamlit.
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- **Optional**: ftfy (mojibake repair).
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- **Dev**: pytest, tox.
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## 16. Test coverage
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- 1,762 tests passing, 0 skipped, 0 xfailed.
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- Fixture corpora: text-cleaner (21), encodings (31), reference UTF-8 (9), format-cleaner (199 buyer cases + 20-row international stress fixture), missing-handler (3 use cases + 16 edge cases), column-mapper (3 use cases + 5 edge cases).
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- Run: `python run_tests.py [--tool …] [--fixtures] [--coverage]`.
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## 17. Privacy / data handling
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- All processing local; no network calls in the data path.
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- No telemetry.
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- Original input never modified.
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- Audit logs: `logs/` next to each run (timestamped).
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## 18. Error handling
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- Structured hierarchy: `DataToolsError` → `InputValidationError`, `ConfigError`, `FileFormatError`, `FileAccessError`.
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- Subclasses extend stdlib `ValueError` / `OSError` so existing handlers still catch them.
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- Every error carries: message, file path, column, operation, suggestion, underlying cause.
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