WORK-476
ID:WORK-476Status:done

Reading-register engine resolver + data-reading emission

Build the shared register-resolution contract and data-reading emission that the rest of SPEC-108 hangs off. Per SPEC-108 §6 + Work breakdown 1.

Priority:highComplexity:moderateMilestone:v0.26.0Source:SPEC-108
claude/spec-108-reading-role View source

Criteria completion

Criteria completion: 3 of 3 (100%) checked; tracking started on Jun 25, no incremental history yet0%25%50%75%100%Jun 25Jul 11

Tracking started Jun 25 — check back for trends.

Relationships

Implements 1
Related 4
Branches 3
claude/spec-108-reading-role current done
main donechangeset-release/main doneclaude/v0.26.0-milestone-2vuxi9 ready
History 2
  1. ef47667
    Created (done)by bjornolofandersson
  2. 17d2678
    Content editedby Claude
    v0.26.0: accept ADR-018 + SPEC-099/100/108, break down into 15 work item

Scope

  • Vocabulary: READING_REGISTERS = ['fine','ui','prose'] as const + ReadingRegister type, in a shared location importable by engine, validation, and editor.
  • Sources: a universal reading block attribute (validated against the vocabulary, like width); RuneConfig.defaultReading?: ReadingRegister (mirroring defaultWidth/ defaultElevation); a reading? default on the content LayoutSlot.
  • Resolver: a pure resolveReading({ authorAttr, runeDefault, regionDefault }) with precedence author ▸ rune ▸ region ▸ ui, plus a coerceRegister() that validates-or-undefined so author typos fall through to the cascade. The region default seeds only the bare body; nested runes resolve from their own defaultReading ?? 'ui'.
  • Emission: emit data-reading="<value>" on the element carrying data-section="body", and suppress emission when the resolved register is ui (the width-style !== default guard) so unmarked content stays byte-identical. Each data-section="body" resolves independently.
  • Capability table: READING_CAPABILITIES: Record<ReadingRegister, { dropcap: boolean }> (only prose → true) as the single declarative source imported by engine + editor.

Acceptance Criteria

  • A reading role with the ordered set fine | ui | prose is emitted as data-reading refining data-section="body"; ui is the default and unmarked content is byte-unchanged.
  • A single pure resolveReading() (precedence author ▸ rune ▸ region ▸ ui) and the READING_CAPABILITIES table are exported as the shared contract; the region default seeds only the bare body, nested runes resolve from their own defaultReading ?? 'ui'.
  • RuneConfig.defaultReading, the universal reading attribute, and the content-LayoutSlot reading default all exist and feed the resolver; coerceRegister() drops invalid author values to the cascade.

Dependencies

None. Foundational — the rest of SPEC-108 builds on this resolver + emission.

References

  • Spec: SPEC-108 §6 (data shape), §4 (assignment). Mirrors SPEC-107 axes.
  • packages/transform/src/engine.ts (data-section/width emission), packages/transform/src/types.ts (RuneConfig, LayoutSlot).

Resolution

Completed: 2026-06-25

Branch: claude/spec-108-reading-role

What was done

  • packages/transform/src/reading.ts (new) — the shared contract: READING_REGISTERS/ReadingRegister, coerceRegister() (validate-or-undefined), resolveReading({authorAttr, runeDefault, regionDefault}) with precedence author ▸ rune ▸ region ▸ ui, DEFAULT_READING, and the READING_CAPABILITIES table (only prose → dropcap).
  • packages/transform/src/types.ts — RuneConfig.defaultReading? and LayoutSlot.reading? (both ReadingRegister).
  • packages/transform/src/engine.ts — resolves the rune's register (author ?? defaultReading, no region default at rune level) and emits data-reading on the [data-section="body"] element, suppressed at the ui default. Threaded through applyBemClasses + applyProjection.
  • packages/runes/src/lib/index.ts + attribute-presets.ts — reading universal block attribute (fine|ui|prose).
  • Re-exported the contract from @refrakt-md/transform and @refrakt-md/runes.
  • packages/transform/test/reading.test.ts (new) — resolver precedence, typo-fallthrough, capability table, and engine emission (rune default, ui suppression, author override, invalid→default). Updated the reference test's universal-attr list.

Notes

  • The LayoutSlot.reading field + the resolver's regionDefault path exist; wiring the content-region default to the bare article body (the non-rune top-level markdown) is WORK-477, along with assigning the per-rune/layout default values. No rune sets defaultReading yet, so output is byte-unchanged and structure contracts are untouched.