claude@clouddev1
74c3ec1edf
Concrete specification for the direction in ADR-0023, landed during the round-6 design pass. Resolves all four rounds of open design questions: walker as single source of truth, scannerless terminal vocabulary (~8 building blocks), typed value slots with content validators, WalkContext for schema- aware narrowing from day one, WalkOutcome multi-purpose return, HintMode per-node, ranker as separate layer, static + dynamic sub-grammars, aliases as Word annotations, IdentSource taxonomy, six-phase per-command migration with chumsky and walker side-by-side during the transition. Key shifts from ADR-0023's sketch: - Lexer dissolves entirely. Walker operates on bytes directly. dsl/lexer.rs, dsl/keyword.rs go away in Phase F. - Schema-aware parse from day one (not phased). Typed value slots reject mis-shaped input at parse time with localised wording. Completion narrows per column type. - Sub-grammars: static (fn() -> Node) for composition; dynamic (fn(&WalkContext) -> Node) for schema-dependent expansion. No global named registry. - Path-bearing commands: BarePath becomes a routine non-whitespace terminal. Paths with spaces require quoting via StringLit (UX simplification, aligns with standard CLI convention). - 13-node taxonomy: Word, Punct, Ident, NumberLit, StringLit, BlobLit, Flag, BarePath, Choice, Seq, Optional, Repeated, DynamicSubgrammar. Migration plan: Phase A (walker scaffolding + app-lifecycle commands), Phase B (DDL without value literals), Phase C (create table), Phase D (data commands with full schema awareness -- the design's central claim landing), Phase E (replay), Phase F (delete chumsky + lexer + legacy parser modules, simplify catalog). Estimated ~4 sessions total. Also: rename ADR-0023 from 0023-proposed-unified-grammar-tree.md to 0023-unified-grammar-tree.md (git mv preserves history) and update its status to reflect the direction-accepted-but- superseded-for-execution-detail relationship with ADR-0024. Index updated.