feat(grammar): ordered structure and admissibility model#528
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The padding-step disassembly line emitted a trailing space after the `...` marker. Trim it so golden fixtures carry no trailing whitespace. Pure formatting: regenerates the affected emit/vm golden fixtures.
…anchors.rs Codegen's sibling-gap and trailing-anchor navigation logic moved into a single `analyze/anchors.rs` so there is one place that decides what an anchor lets a sibling gap skip. The VM cursor and the Thompson lowering passes now read their skip decisions from the shared `NodeClass`/`SkipClass` vocabulary in `core`. Pure refactor: no emitted-bytecode changes.
Build an ordered skeleton of each grammar variable's productions (`structure.rs`) and a structural admissibility index — which child kinds and fields each node kind admits, with supertype reachability (`admissibility.rs`). `Grammar` exposes both so later passes can ask order-, field-, and arity-aware questions the flat metadata cannot answer.
This was referenced Jun 27, 2026
zharinov
enabled auto-merge (squash)
June 27, 2026 19:32
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Summary
structure.rs).admissibility.rs).Grammarexposes both.Why
Later passes need order-, field-, and arity-aware questions about the grammar. The flat node metadata cannot answer those.
Notes
No behavior change on its own. This is the data model the satisfiability checker uses next.