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Lucas WintherandClaude Opus 5.5 820b378929 feat: undo in Module 9 and stackAt from Module 8; Lesson 8 quote matches the reference

Baba.undo() restores the level before the last step or move (board snapshot:
objects in age order with ids, the id counter, and won; rules recompiled).
place clears the history. SpellGrid's undo throws/panics 'not supported'.
stackAt / stack_at lists a tile's kinds oldest first, on Baba and SpellGrid.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

2026-11-11 11:20:03 +01:00

src

feat: undo in Module 9 and stackAt from Module 8; Lesson 8 quote matches the reference

2026-11-11 11:20:03 +01:00

.course.json

feat: module 09 turn pipeline

2026-10-29 04:28:17 +01:00

.gitignore

feat: module 09 turn pipeline

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Cargo.lock

feat(ci): verify Expansion Drop solutions; README quick start, disclaimer link; Rust reference lockfiles

2026-10-29 19:13:11 +01:00

Cargo.toml

feat: module 09 turn pipeline

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README.md

feat: undo in Module 9 and stackAt from Module 8; Lesson 8 quote matches the reference

2026-11-11 11:20:03 +01:00

README.md

Module 9 reference engine (Rust)

The course's own engine as of the end of Module 9. Part I's card engine is unchanged, and all of its tests still pass. The Part II engine in src/engine/puzzle/ now plays a whole turn: movement, parse, conversion, parse, hazards, win, parse. Module 8's reference was the starting point, so a diff between the two shows what this module adds.

cards/ (at the crate root; not in this directory): Part I's card data, a copy of course/cards/ staged by tools/verify-references.mjs. Part II doesn't read it.
src/engine/puzzle/: the Part II engine. It names no noun: the engine's own words are the operators IS, AND, NOT, the meta-noun TEXT, the property PUSH of the base rule TEXT IS PUSH, the property YOU, which picks the objects that move, and from Module 9 the properties WIN (the win check) and FLOAT (which objects share a tile).
- turn.rs (new): the turn. Phase, TURN (the phases in order) and Hazard (content's rule for what destroys what).
- level.rs: a level in play. Module 9 adds Level::step, which runs the phases of TURN; the conversion phase (X IS Y in place, X IS X locks, X IS NOT X deletes, and ... IS NOT Y keeps every object it names from becoming a Y, as has_property settles negation per object); the hazards phase, which runs content's hazards in order; the win check; Level::sharing (the other objects on a tile at the same float level); won and lost. Level::new takes the hazards. move_you is now movement, then a reparse. Level::undo puts back the snapshot saved before the last move_you or step (a clone of the board, and won) and reparses; place clears the history.
- grid.rs: Module 9 adds Board::set_kind.
- word.rs: Module 9 adds Lexicon::thing_named (what a conversion into a noun makes).
- movement.rs, parse.rs, resolve.rs: unchanged.
- mod.rs: the module's exports.
The rest of src/engine/: Part I, unchanged.
src/content/hazards.rs (new) and src/content/mod.rs: the hazards, in the order the engine runs them: SINK, HOT/MELT, DEFEAT. What destroys what at the end of a turn is content, not engine.
src/content/movement.rs: unchanged.
src/content/words.json: Module 9 adds HOT, MELT, SINK, DEFEAT and FLOAT, and ALL, the Module 7 Expansion Drop, which the Module 9 tests need.
src/harness.rs: the adapter the course tests call. Module 9 adds Baba::step, Baba::won, Baba::lost and Baba::undo.

Run it with the module's tests: node tools/verify-references.mjs 09 from the course repository.