Introduces src/core/errors.py with a small structured error hierarchy
that every public entry point now uses. Each error carries the
context a user needs to fix it and the context a maintainer needs to
trace it.
The hierarchy:
DataToolsError (base — formats path, column, operation, suggestion)
InputValidationError (extends ValueError — bad arg / wrong type)
ConfigError (extends ValueError — bad config / options)
FileFormatError (extends ValueError — file is not what we expected)
FileAccessError (extends OSError — file I/O failure)
Subclassing the stdlib bases means existing `except OSError` /
`except ValueError` handlers still catch them — no breaking change.
Helpers:
- ensure_dataframe(value, function=...) — uniform DataFrame guard
- ensure_choice(value, name=, choices=) — uniform enum/literal guard
- wrap_file_read(path, op, exc) — tag OSError with hint + path
- wrap_file_write(path, op, exc) — same, with Windows-aware tip
- format_for_user(exc, context=) — user-facing string for st.error / stderr
Library hardening:
- io.read_file: missing files surface FileAccessError listing whether
the parent directory exists, and the suggestion to check the path.
- io.read_file: chunk_size <= 0 now raises InputValidationError with
a positive-integer suggestion.
- io._read_excel: openpyxl BadZipFile / InvalidFileException / pandas
ValueError ("sheet not found") wrapped as FileFormatError listing
the path and a "list sheets with list_sheets()" hint.
- io._detect_excel_header_row: bare except narrowed to specific
openpyxl exceptions; falls back gracefully and logs at debug so
the real error surfaces from pd.read_excel.
- io.write_file: OSError / PermissionError on to_csv/to_excel wrapped
with file path and Windows-aware "file may be open in another
program" hint.
- dedup._parse_date: bare `except Exception` narrowed to
(TypeError, ValueError, OutOfBoundsDatetime); failed values
logged at debug for survivor-selection forensics.
- dedup._select_survivor: KEEP_MOST_RECENT now raises
InputValidationError instead of silently falling back to keep_first.
- dedup.deduplicate: input validation errors are InputValidationError
with operation/column/suggestion fields.
- format_standardize.from_dict: invalid FieldType for a column raises
ConfigError naming the column AND the bad value AND listing valid
values; same for date_order / phone_format / etc.
- format_standardize.from_file: OSError / JSON decode wrapped with
path AND line/column where parsing failed.
- format_standardize.to_file: TypeError on json.dumps wrapped as
ConfigError with the suspected source (extra_abbreviations).
- format_standardize._apply_field_type: dispatcher's "unknown field
type" branch now raises AssertionError (it's an internal invariant,
not user error — a new enum value was added without a branch).
- format_standardize._resolve_column_types: missing-column error now
InputValidationError with a "check for typos / unparsed header"
suggestion.
- format_standardize.standardize_dataframe: ensure_dataframe at entry.
- text_clean.clean_dataframe: ensure_dataframe at entry.
- config.to_strategies: invalid Algorithm/NormalizerType wrapped as
ConfigError naming the strategy index AND the column.
- config.to_survivor_rule: invalid SurvivorRule wrapped as ConfigError
listing valid values.
- config.from_file: OSError / JSON decode wrapped (mirror of
StandardizeOptions.from_file).
- fixes.repair_mojibake: ImportError on ftfy now logged at info level
with the underlying ImportError so a corrupt-package vs not-installed
distinction is visible in the logs.
- normalizers.normalize_phone: phonenumbers.NumberParseException now
logged at debug when the digits-only fallback drops extension /
country-code information — gives a trail when matching results
look wrong.
GUI / CLI surfaces:
- All 9 page handlers (`except Exception as e: st.error(...)`) now
use format_for_user(), which renders DataToolsError fields nicely
and falls back to "ClassName: message" for unrecognized errors.
- 2_Text_Cleaner and 3_Format_Standardizer additionally distinguish
UnicodeDecodeError with an "re-save as UTF-8" suggestion before
the generic handler.
- cli.py's "Error reading file" handler now uses format_for_user()
and includes the input path in the prefix.
Tests:
- tests/test_errors.py — 22 new tests covering: base class formatting,
stdlib inheritance, ensure_dataframe / ensure_choice helpers,
wrap_file_read / wrap_file_write, format_for_user behavior, and
end-to-end integration (missing file, missing dir, bad JSON, bad
algorithm, bad enum, missing column).
- tests/test_audit_fixes.py + tests/test_io.py — updated 4 tests for
the new exception types (InputValidationError replaces TypeError,
FileAccessError extends OSError).
Full project suite: 1230 passed, 4 skipped, 17 xfailed.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
Adds a Review & Normalize page that sits between upload and every tool
page. The analyzer now tags each finding with confidence (high/medium/low)
and a fix_action; the gate auto-applies high-confidence fixes, surfaces
medium/low ones for user review, and blocks tool pages on error-level
findings until resolved or waived.
Core (src/core/):
- analyze.py: Finding gains confidence, fix_action, pre_applied; new
detectors for encoding_uncertain, encoding_decode_failed; new top-
level encoding_override parameter.
- fixes.py: registry of fix algorithms keyed by fix_action id.
- normalize.py: auto_fix(), apply_decisions(), is_normalized(), and
the NormalizationResult / Decision dataclasses the gate consumes.
- io.py: detect_encoding tries strict UTF-8 first; repair_bytes now
transcodes UTF-16/32 to UTF-8 before NUL-strip (fixes UTF-16 corruption)
and normalizes line endings (fixes bare-CR parser crash); empty file
handled gracefully instead of EmptyDataError traceback.
GUI (src/gui/):
- pages/0_Review.py: gate page with per-finding decision controls,
encoding override picker (16 codepages + custom), and Advanced output
options (encoding, delimiter, line terminator) on the download.
- components.py: require_normalization_gate() helper.
- pages/1-9: gate guard wired on every tool page.
Test corpora:
- test-cases/encodings-corpus/: 31 encoded CSV fixtures + 9 reference
UTF-8 files + manifest, synced from Business/DataTools.
- test-cases/text-cleaner-corpus/test_data/17: synced malformed input
(unquoted $1,500.00) for the unquoted-delimiter detector.
Tests (94 new):
- test_normalize.py (48): finding fields, fix registry, auto_fix scope,
decision paths, gate idempotency, output-options helper.
- test_encodings_corpus.py (90, 16 xfailed): parametric detection +
decode + analyzer-no-crash sweep against the manifest.
- test_analyze.py: encoding override + encoding_uncertain detectors.
- test_corpus.py: pre-parse repair in the strict reader.
run_tests.py: new aliases --tool normalize, --tool encodings, --tool gate;
encodings corpus added to --fixtures category.
Docs: USER-GUIDE §3.3 covers the gate workflow, encoding override, and
output options; TECHNICAL §10.2.1-10.2.4 documents the analyzer schema,
gate API, Review page, and pre-parse repair pipeline; CLI-REFERENCE adds
the analyzer JSON schema with the new fields; README links to all of it.
Suite: 765 passed, 17 xfailed (was 458 passed).
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
The Text Cleaner had two st.dataframe previews — the initial upload
preview ("Preview: filename") and the post-clean "Cleaned preview"
table — that both rendered cells with the same browser-collapses-
whitespace, hides-invisibles problem the analyzer findings panel had
before commit 1049c03.
components.render_hidden_aware_preview(df, n_rows, caption) renders a
DataFrame as an HTML table where:
- every cell uses visualize_hidden_html(mark_outer_whitespace=True),
so leading/trailing ASCII spaces appear as per-character "·" badges
- white-space: pre-wrap on every cell preserves internal multi-space
runs and embedded newlines visually
- headers route through the same visualizer so dirty column names
(NBSP padding, ZWSP, smart quotes) show their badges too
- NaN cells render as a faint "NaN" placeholder
- rows are sticky-headed and scrollable inside a 26rem capped
container so a 10-row preview doesn't push the rest of the UI off
screen
2_Text_Cleaner.py wires it into both previews:
- The upload preview gains its own "Show hidden characters in preview"
toggle (default on).
- The cleaned preview reuses the existing show_hidden toggle that
already governs the Examples changes table, so one switch controls
the whole results section.
Either toggle off falls back to the original st.dataframe view.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
The whole point of the cleaner is to remove characters the user can't
see — which makes the "before / after" preview nearly useless by default.
A cell with NBSP padding looks identical to a cell with regular spaces.
Two new helpers in src.core.text_clean:
visualize_hidden_text(s)
Plain-text rendering: each invisible/control/smart character is
replaced by a glyph + [LABEL] (e.g. "·[NBSP]", "→[TAB]", "∅[ZWSP]",
"""[L DQUOTE]"). Suitable for terminal output, CSV exports, anywhere
HTML is wrong. Unmapped C0 controls render as [U+XXXX].
visualize_hidden_html(s) + hidden_char_css()
HTML rendering: every flagged character is wrapped in a <span> with
a CSS class and a tooltip showing the codepoint and label. Pair with
hidden_char_css() to inject the matching styles. Three colour bands
(whitespace, special, control) so the user can scan an audit table
and spot what's being changed at a glance.
Mapping covers: ASCII tab/LF/CR, every NBSP variant (U+00A0, U+202F,
U+2009, …), zero-width family (ZWSP/ZWNJ/ZWJ/WJ/BOM/SHY), bidi marks
(LRM/RLM), all smart quotes, en/em dashes, ellipsis, prime/double-prime,
and guillemets. ASCII printable text passes through; HTML output also
escapes &/</> .
GUI wiring (src/gui/pages/2_Text_Cleaner.py)
The "Examples" changes table now defaults to a hidden-char-rendered
HTML view: every NBSP/ZWSP/smart-quote/control char is shown with its
badge and codepoint tooltip. A "Show hidden characters" toggle lets
the user fall back to the raw st.dataframe view if they prefer.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
Closes the last UX gap from the analyzer review: each tool page had its
own st.file_uploader, so users had to upload the same file twice (once
on the home page for analysis, once on each tool page).
components.pickup_or_upload(label, key, types) returns either:
- a _StashedUpload shim wrapping the home-page bytes (when present and
the user hasn't asked for a different file on this page), or
- the standard st.file_uploader (when nothing is stashed or the user
clicked "Use a different file").
_StashedUpload duck-types Streamlit's UploadedFile (.name, .size,
.getvalue(), .read()) so existing tool-page code consumes it without
changes. A "Use a different file" button per page sets a session-state
override flag; a "Switch back to upload-screen file" button clears it.
Wired into 2_Text_Cleaner.py and 1_Deduplicator.py — the two pages with
working uploaders today. The remaining stub pages adopt it when they're
implemented; the helper is the public surface they'll use.
Verified by smoke-launching streamlit headless and curling the home,
text-cleaner, and deduplicator routes — all return 200 with no errors
in the server log.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
Add shared hide_streamlit_chrome() helper that removes header bar,
hamburger menu, footer, and deploy button via CSS injection. Called
on every page. Add .streamlit/config.toml with minimal toolbar mode.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
Convert single-page deduplicator into a multi-page suite. Home page shows
tool card grid. Deduplicator extracted to its own page (fully working).
8 stub pages added for Text Cleaner, Format Standardizer, Missing Values,
Column Mapper, Outlier Detector, Multi-File Merger, Validator & Reporter,
and Pipeline Runner — each with functional file upload and coming-soon UI.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
