fix(engine): one-shot 'the next time target creature would deal damage' prevention (Awe Strike class) - #7334
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…e' prevention (Awe Strike class)
The next-time prevention family dropped the chosen target creature from the
shield (damage_source_filter: None, target: Any) and never consumed the
shield, preventing every damage event instead of the next one.
- parser: parse_oneshot_target_source_prevent recognizes 'the next time
[target creature|that creature] would deal [combat] damage [this turn|this
combat], prevent that damage' and emits Effect::PreventDamage with an
And{[ParentTargetSlot{0}, Typed(creature)]} source filter (Dromoka's
Command-shaped); rejected in trigger bodies (Ria Ivor / Impulsive
Maneuvers stay as-is); 'that creature' and declared-target subjects both
resolve through parse_target
- types: ShieldKind::PreventionOneShot (CR 614.1a + CR 615.1a + CR 615.3 +
CR 514.2); shared is_oneshot_target_source_prevent_shape predicate (single
authority for parser gate + resolver discriminator, exact two-leg shape)
- resolver: one-shot shape sets consume_on_apply (consumed on first
prevention, CR 615.3) and installs the 'prevented this way' rider via the
existing runtime_execute slot (single fire; no double-fire in combat
batches)
- assembly: bare 'prevented this way' folds to ContinuationStep only when
the chain root is a target-source prevent (Awe Strike); Reverse Damage's
chosen-source form stays SequentialSibling
- fixes: Awe Strike, Dazzling Reflection
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
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🚧 Files skipped from review as they are similar to previous changes (11)
Included review availability: Your plan includes up to 2 reviews per rolling hour; 1 remains after this review. 📝 WalkthroughWalkthroughThe PR adds one-shot, source-specific damage prevention. It parses target-source prevention text, creates consumable ChangesOne-shot prevention flow
Estimated code review effort: 4 (Complex) | ~45 minutes Merge Risk: ⚪ Minimal · up to The change makes damage prevention apply only once to the chosen creature and awards the life gain once, with targeted tests and required checks passing; no actionable merge-blocking risk remains beyond normal review. Sequence Diagram(s)sequenceDiagram
participant OracleParser
participant PreventDamage
participant ReplacementEngine
participant GameRunner
OracleParser->>PreventDamage: parse and classify target-source prevention
PreventDamage->>ReplacementEngine: install PreventionOneShot shield
GameRunner->>ReplacementEngine: apply matching damage event
ReplacementEngine-->>GameRunner: prevent event and emit DamagePrevented
ReplacementEngine->>ReplacementEngine: consume shield after nonzero prevention
🚥 Pre-merge checks | ✅ 5✅ Passed checks (5 passed)
✨ Finishing Touches🧪 Generate unit tests (beta)
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Actionable comments posted: 3
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Inline comments:
In `@crates/engine/src/game/replacement.rs`:
- Around line 2421-2441: Update the PreventionOneShot handling in the
ProposedEvent::Damage branch to execute DamagePrevented bookkeeping and return
ApplyResult::Prevented only when dmg is greater than zero. For a zero amount,
fall through to the existing pass-through path and preserve the event using the
available is_combat and applied fields rather than consuming the shield.
In `@crates/engine/src/parser/oracle_replacement.rs`:
- Around line 6540-6547: Update the one-shot prevention construction around the
duration lowering near parse_duration so an unlowerable duration returns None
and falls through to the generic branch instead of emitting a shield with
prevention_duration: None. Preserve the existing handling for successfully
parsed “this turn” and “this combat” durations.
In `@crates/engine/src/parser/swallow_check.rs`:
- Around line 5256-5259: Update the Bronze Horse assertion in the relevant
parser test to match only ShieldKind::Prevention, ensuring its continuous “as
long as” behavior cannot pass with ShieldKind::PreventionOneShot. Add or use a
separate “next time” fixture to assert ShieldKind::PreventionOneShot, and verify
the typed runtime shape directly.
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📒 Files selected for processing (11)
crates/engine/src/game/coverage.rscrates/engine/src/game/effects/prevent_damage.rscrates/engine/src/game/replacement.rscrates/engine/src/parser/oracle_effect/assembly.rscrates/engine/src/parser/oracle_effect/imperative.rscrates/engine/src/parser/oracle_ir/context.rscrates/engine/src/parser/oracle_replacement.rscrates/engine/src/parser/swallow_check.rscrates/engine/src/types/ability.rscrates/engine/tests/integration/awe_strike_prevention.rscrates/engine/tests/integration/main.rs
matthewevans
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Changes requested — reviewed at current head 5dbfa059426de46ae335d5663a1b6ef4ffd2fbf2.
🔴 Blockers
-
crates/engine/src/game/replacement.rs:2421appliesPreventionOneShotto aDamageevent whose amount is zero, emitsDamagePrevented, and returnsPrevented; the common applier consequently consumes the shield at:8631. This is rules-incorrect: CR 120.8 says that zero damage is not dealt, and CR 609.7b says a source-qualified shield that prevents no damage is not used up. Fall through for zero amount, and add a runtime replacement-chain test proving the shield and its rider survive before a subsequent nonzero matching event. -
crates/engine/src/parser/oracle_replacement.rs:6542accepts a duration by phrase scan, but:6610permitsparse_durationto fail and still emitsprevention_duration: None. The resolver then gives the shield noEndOfCombatexpiry (prevent_damage.rs:379), widening a printed “this combat” window through end of turn. CR 511.2 requires the effect to expire at end of combat. Make the duration lowering required for this branch (otherwise fall through), with a regression assertion for the fail-closed contract. -
crates/engine/src/parser/swallow_check.rs:5256weakens the existing Bronze Horse regression assertion from its continuousShieldKind::Preventionshape to acceptPreventionOneShot. Bronze Horse’s “as long as” prevention must remain continuous, so an incorrect one-shot classification now passes the test. Restore the exact continuous assertion; keep a separate positive assertion for the target-source one-shot shape.
The engine/parser diff also lacks the required current-head <!-- coverage-parse-diff --> artifact, so the claimed two-card parse impact cannot yet be verified.
Please address all three blockers, add the discriminating runtime/parser regressions, and allow CI to publish a parse-diff artifact bound to the new head.
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Generated for head Parse changes introduced by this PR · 2 card(s), 1 signature(s) (baseline: main
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…nd 2) 1. zero-damage no longer consumes the one-shot shield or fires the rider — CR 120.8 (zero damage is not dealt) + CR 609.7b (shield not used up when it prevents nothing); applier 0-guard falls through to the unchanged pass-through, dispatcher consume-guard (scoped to PreventionOneShot) suppresses consumption for the unchanged event 2. duration lowering is now mandatory in parse_oneshot_target_source_prevent — an unparsable window falls through instead of emitting a prevention_duration: None shield (CR 511.2 end-of-combat expiry preserved) 3. Bronze Horse regression restored to exact ShieldKind::Prevention — the continuous 'as long as' shield must never classify as one-shot; separate positive asserts the target-source one-shot shape via the shared is_oneshot_target_source_prevent_shape predicate New discriminating tests: awe_strike_zero_damage_event_does_not_consume_ shield_or_fire_rider (real pipeline, shield survives to a later nonzero event), parser duration fail-closed contract, Bronze Horse exact-kind assertion. Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
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All three blockers addressed at head 1. Zero-damage consumption (replacement.rs)Fixed per CR 120.8 + CR 609.7b: the Discriminating test: 2. Mandatory duration lowering (oracle_replacement.rs)
3. Bronze Horse exact-kind assertion (swallow_check.rs)Restored to exact Gate A PASS head=492a22e0e9f16a63564d8bb81a33ae22572b8a13 base=0c0ef3456dce81522ee3542429c8ca49b423aed5 |
Resolve maintainer-side replacement routing and parser API drift while preserving the contributor’s target-source one-shot prevention behavior. Co-authored-by: Xunchi Zhang <ice_world@outlook.com>
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Note GitHub couldn't provide a complete incremental comparison for this pull request, so CodeRabbit is performing a full review instead. This review may take a little longer. |
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Maintainer ported this branch across current The current-head CI run and |
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Approved at current head 420aae82071b09f9bae7e4954089e49195788315.
The ported branch clears the prior three blockers: zero-damage events leave the one-shot shield intact, duration lowering fails closed, and continuous prevention remains separately asserted. Current required CI is green; the SHA-bound parse-diff reports only Awe Strike and Dazzling Reflection; and the current CodeRabbit review reports no actionable findings.
2 participants
Summary
Fixes the Awe Strike-class misparse (backlog root-cause 11: replacement/prevention mis-modeled). "The next time target creature would deal damage this turn, prevent that damage. You gain life equal to the damage prevented this way." previously parsed to
PreventDamage { All, Any, AllDamage }— the chosen target creature was dropped from the shield (no source restriction) and the shield never consumed, preventing every damage event instead of the next one.Now parses to
PreventDamage { All, Any, AllDamage, damage_source_filter: Some(And{[ParentTargetSlot{0}, Typed(Creature)]}), prevention_duration: UntilEndOfTurn }with the gain-life rider as a ContinuationStep. The shield is source-scoped to the chosen creature (CR 609.7a capture + CR 609.7b recheck), consumed on first prevention (CR 615.3), and the rider fires exactly once per prevented event (including combat batches).Files changed
Track
Developer
LLM
Model: claude-fable-5
Tier: Frontier
Thinking: max
Implementation method (required)
Method: /engine-implementer
CR references
Verification
Required checks ran clean, or the exact CI-owned alternative is stated below.
Gate A output below is for the current committed head.
Final review-impl below is clean for the current committed head.
Both anchors cite existing analogous code at the same seam.
cargo test -p phase-engine --lib— 18872 passed, 0 failed, 6 ignoredcargo test -p phase-engine --test integration— 4826 passed, 0 failed, 2 ignored (incl. 7 new awe_strike_prevention tests)cargo clippy -p phase-engine --all-targets— cleancargo fmt --all -- --check— clean./scripts/gen-card-data.sh— regenerated; Awe Strike/Dazzling Reflection parse flipped to the correct shape; all negative-case cards (Ria Ivor, Impulsive Maneuvers, Reverse Damage, Circle of Protection: Red, Desperate Gambit, Charm Peddler, Kithkin Armor) byte-identical to BASE./scripts/check-parser-combinators.sh— Gate G PASS, Gate A PASS (see below)Gate A
Gate A PASS head=5dbfa059426de46ae335d5663a1b6ef4ffd2fbf2 base=0c0ef3456dce81522ee3542429c8ca49b423aed5
Anchored on
parse_oneshot_damage_replacementone-shot family (the new branch is a sibling interception before the "this turn" gate)parse_oneshot_next_n_damage_to_self_redirect(preceding redirect sibling with the same fall-through contract)ParentTargetSlotsource-capture precedent (the And{[PTS, Typed]} shape)batched_combat_all_shieldgate (PreventionOneShot excluded by shape, single-fire preserved)Final review-impl
Final review-impl PASS head=5dbfa059426de46ae335d5663a1b6ef4ffd2fbf2
Round 1 findings (6) all addressed:
is_oneshot_target_source_prevent_shapepredicate (exact two-leg shape, single authority with the assembly gate)post_replacement_ridertemplate mechanism entirely; rider reinstalled via existingruntime_executeslotClaimed parse impact
Awe Strike, Dazzling Reflection (both flipped from
target: Any+ no source filter to the source-scoped one-shot shape). Ria Ivor / Impulsive Maneuvers / Reverse Damage / CoP:Red / Desperate Gambit / Charm Peddler / Kithkin Armor unchanged.Scope Expansion
None.
Validation Failures
None.
CI Failures
None.
Summary by CodeRabbit
New Features
Bug Fixes