Normalize broadcast symbols for the Wii font

[ColinGamez]

What changed

• convert supplementary enclosed broadcast symbols to readable BMP text such as [字], [再], and [解]
• omit unsupported supplementary emoji rather than emitting surrogate question marks
• use 番組情報なし for upstream placeholder titles containing only whitespace
• reject any supplementary characters that survive collection

Why

TV no Tomo's Wii-era font renders supplementary Unicode characters as two question-mark boxes. This keeps titles and descriptions readable without changing the native data path.

Checks

• rebuilt and validated all 54 areas and 14,871 programs
• confirmed zero supplementary characters remain in the national feed
• verified live Gunma EPG and string delivery byte-for-byte

Summary by Sourcery

Normalize program titles and descriptions to avoid Wii-unsupported supplementary characters in the HBNJ guide data pipeline.

Bug Fixes:

• Strip or replace supplementary broadcast symbols in titles and descriptions with Wii-readable text to prevent unreadable surrogate characters.
• Ensure placeholder titles consisting only of whitespace are replaced with 番組情報なし.
• Fail validation if any Wii-unsupported supplementary characters remain in program titles or descriptions.

Enhancements:

• Add a Wii-safe text normalization helper to compact and normalize broadcast symbols in collected guide data.

[sourcery-ai]

Reviewer's Guide

Normalize HBNJ program titles/descriptions for Wii-era font limitations by introducing a Wii-safe text sanitizer in collection and enforcing validation that rejects supplementary Unicode characters in the generated guide.

Flow diagram for Wii-safe text normalization and validation

flowchart LR
    subgraph Collection_collect_hbnj_region
        A[Raw HBNJ title/description] --> B[compact_text]
        B --> C[wii_safe_text]
        C -->|empty after wii_safe_text| D[Set title to 番組情報なし]
        C -->|non-empty| E[Persist title/description in guide JSON]
    end

    subgraph Validation_validate_hbnj_guide
        E --> F[main]
        F --> G[Iterate programs]
        G --> H["Scan title for ord(character) > 0xFFFF"]
        G --> I["Scan description for ord(character) > 0xFFFF"]
        H -->|supplementary found| J[fail with Wii-unsupported codes]
        I -->|supplementary found| J
        H -->|none| K[Accept title]
        I -->|none| L[Accept description]
    end

Loading

File-Level Changes

Change	Details	Files
Introduce Wii-safe text normalization to strip or normalize supplementary broadcast symbols before persisting titles and descriptions.	Add a wii_safe_text helper that drops non-BMP characters, normalizes compatible supplementary broadcast symbols via NFKC, wraps them in brackets, and trims whitespace Invoke Wii-safe normalization on parsed titles, falling back to a standard placeholder when the result is empty Invoke Wii-safe normalization on parsed descriptions so they no longer contain unsupported supplementary characters	tools/collect_hbnj_region.py
Tighten guide validation to reject titles/descriptions containing Wii-unsupported supplementary Unicode characters.	Scan program titles and descriptions for code points above U+FFFF to detect supplementary characters Fail validation with a clear error message including up to three offending code points when supplementary characters are found	tools/validate_hbnj_guide.py

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[sourcery-ai]

Hey - I've left some high level feedback:

• Consider extracting the supplementary-character validation logic in validate_hbnj_guide.py into a small helper (e.g., assert_wii_safe(field_name, value, program_id)) so the title/description loop is easier to read and can be reused or extended consistently later.
• In wii_safe_text, you currently re-normalize whitespace with re.sub(r"\s+", " ", ...) even though compact_text already does this; if the function is always called on compacted text, you could skip this second pass to avoid subtly changing inputs that might not have been compacted first.

Prompt for AI Agents

Please address the comments from this code review:

## Overall Comments
- Consider extracting the supplementary-character validation logic in `validate_hbnj_guide.py` into a small helper (e.g., `assert_wii_safe(field_name, value, program_id)`) so the title/description loop is easier to read and can be reused or extended consistently later.
- In `wii_safe_text`, you currently re-normalize whitespace with `re.sub(r"\s+", " ", ...)` even though `compact_text` already does this; if the function is always called on compacted text, you could skip this second pass to avoid subtly changing inputs that might not have been compacted first.

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