refactor: replace fixed STYLE_user with open-ended style tag system

- STYLE_user renamed to STYLE_H1K0 in VOCAB (author's personal tag)
- Style field now accepts any [A-Za-z][A-Za-z0-9_]* identifier in .chord files
- Unknown styles fall back to STYLE_other at tokenization time with a log warning
- Test fixtures updated to style: other; drop closed _VALID_STYLES frozenset
- Spec bumped to v2.1: documents open style field, fallback behaviour, and §5.7
  guide on registering a new style token

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

This commit is contained in:

Masahiko AMANO

2026-05-20 00:29:52 +03:00

parent 84ba7b4743

commit 4fd8ece170

12 changed files with 60 additions and 38 deletions

tests/fixtures/valid_b_minor.chord

Vendored

+1 -1

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@@ -2,6 +2,6 @@
 # key: B_minor
 # time: 4/4
 # subdivision: 4
 # style: user
 # style: other
 | Bm . . . | C#m7b5 . . . | D . . . | F#7 . . . |