fix(engine): name the sourceless rule triggers on the stack - #7523
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CR 113.8's four exceptions — CR 725.2 (monarch), CR 726.2 (initiative), CR 728.1 (rad counters), CR 702.179d (speed) — mint triggered abilities with no source object, so the objects-map lookup that fills `source_name` found nothing and the wire carried an empty name. The client filled that hole with a literal "Unknown" and fed it to the card-image lookup, which painted a card-shaped box by that name on the stack. Inventing game-facing content is not the display layer's call. `trigger_source_display_name` is now the single authority for the question, answering in order: the ability's captured `trigger_source` (CR 400.7 + CR 113.7a, via `lki()`), else `source_id` in the objects map (CR 603.7d — delayed triggers carry no captured source but do point at a live object), else the trigger's own description. Both the stack push and the ordering prompt route through it; they previously answered the same question two different ways. The four sourceless descriptions become display-ready labels, matching the short-label convention already used for Prowess / Storm / Cascade. Their CR references move into code comments, where CLAUDE.md wants them — they were being rendered to players as part of the label. A debug_assert in the push path holds the line: an entry carrying the ObjectId(0) no-source sentinel must carry its own name. Keyed on the sentinel, not on a list of the four rules. Also corrects two descriptions that cited CR 725.2 for an initiative ability; the initiative is CR 726.2. NOT closed: the stronger invariant "every stack entry names its source" is false today — asserting it fails 53 tests (delayed triggers) and the middle form fails 10 more (fixtures naming an uninserted source id). Both groups stay nameable by a viewer, so neither is this defect. Closes phase-rs#7520.
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Included review availability: Your plan includes up to 2 reviews per rolling hour; 1 remains after this review. 📝 WalkthroughWalkthroughThe engine now resolves names for sourceless triggers from captured sources, live objects, or trigger descriptions. Viewer-facing descriptions were updated for inherent rule triggers. The client no longer displays ChangesSourceless trigger display names
Estimated code review effort: 3 (Moderate) | ~20 minutes Merge Risk: ⚪ Minimal · up to The change localizes sourceless trigger naming to the engine and removes invented client text; no actionable merge-blocking risk remains after normal checks and review. Possibly related PRs
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In `@crates/engine/src/game/triggers.rs`:
- Around line 6897-6901: Correct the CR source citation and avoid claiming the
implemented sourceless forms are exhaustive: in
crates/engine/src/game/triggers.rs lines 6897-6901 cite CR 113.7 and limit the
description to the forms implemented here; in crates/engine/src/game/triggers.rs
lines 7483-7490 remove the claim that they are CR 113.8’s four exceptions;
update the descriptive comments in
crates/engine/tests/integration/inherent_rule_trigger_display_name.rs lines 1-6,
client/src/components/stack/StackEntry.tsx lines 76-83, and
client/src/components/stack/__tests__/StackEntry.test.tsx lines 147-152 to
remove exhaustive sourceless/inherent-trigger claims.
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client/src/components/stack/StackEntry.tsxclient/src/components/stack/__tests__/StackEntry.test.tsxcrates/engine/src/game/triggers.rscrates/engine/tests/integration/inherent_rule_trigger_display_name.rscrates/engine/tests/integration/main.rs
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Generated for head Parse changes introduced by this PR✓ No card-parse changes detected. |
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Maintainer fixup |
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Approved on exact head 8a517c472a053f4c5e5ed567c1542e3f7c81a2f0: current required checks, SHA-bound no-parse-change evidence, and current independent feedback are clear.
2 participants
Closes #7520.
A stack entry for an inherent rule ability reached the client with an empty source name, and the client filled the hole with a literal
"Unknown"of its own — then asked the card-image layer for a card by that name. Reported from a real game: increasing speed off combat damage briefly showed a blank card on the stack.source_namebefore""The Monarch""Start your engines!Rules
CR 113.7 defines an ability's source. CR 113.8 instead defines its controller. The four sourceless rule-trigger forms this change constructs — CR 725.2 (monarch), CR 726.2 (initiative), CR 728.1 (rad counters), and CR 702.179d (speed) — each state that the ability has no source. CR 901.8 separately gives Planechase's planeswalking ability no source; that ability is outside this PR's implemented set. The engine models the four constructed forms with the
ObjectId(0)no-source sentinel, so the objects-map lookup that fillssource_namefinds nothing.Nothing about that is a rules defect. The defect is what the wire left the display layer to do:
"Unknown"is game-facing text no rule produces, invented because the wire carried nothing — the frontend deriving content, which CLAUDE.md forbids. It then travels into the image lookup, which searches for a card by that name, finds none, and paints a card-shaped box labelled "Unknown".What changed
Engine.
trigger_source_display_nameis now the single authority for "what names this trigger's source", answering in a fixed order:trigger_source(CR 400.7 + CR 113.7a —lki(), so "From " survives the source dying),source_idin the objects map (CR 603.7d — delayed triggers carry no captured source but do point at a live object),Both callers — the stack push and the trigger-ordering prompt — go through it. They previously answered the same question two different ways, and step 2 exists because collapsing them onto step 1 alone blanked every delayed and co-triggered entry (caught by
issue_423_co_triggered_targeted_observer_reaches_stack).The four sourceless descriptions become display-ready labels —
The Monarch,The Initiative,Start your engines!,Rad counters— matching the short-label convention already used forProwess/Storm/Cascade. The CR reference moves into a code comment, where CLAUDE.md wants it; it was previously rendered to players as part of the label.Guard. A
debug_assert!in the push path: an entry carrying theObjectId(0)sentinel must carry its own name. Keyed on the sentinel rather than a list of the four rules, so a fifth sourceless rule is covered the day it is written.Client. The
|| "Unknown"literal is deleted, not replaced. An empty label is the honest answer if a name is ever missing; the engine-side guard is what should fail.Also fixed: two descriptions cited CR 725.2 for an initiative ability. The initiative is CR 726.2 (
docs/MagicCompRules.txt:6250); CR 725.2 is the monarch.Scope
Exactly the four sourceless rule-trigger forms this engine path constructs. Monarch steal and initiative steal are unaffected — they carry the damaging creature as a real source. Planechase's separately sourceless planeswalking ability is outside this implementation.
Tests
crates/engine/tests/integration/inherent_rule_trigger_display_name.rs— the two rows above, asserted by VALUE rather than!is_empty(), since an emptiness check passes on any placeholder the engine might grow later.client/.../StackEntry.test.tsx— two rows: the engine-provided name is what gets rendered, and an entry whose wire name is empty produces no invented text.Counter-probes. Engine: replacing the description fallback with
String::new()drops both integration rows, and they fail on the guard, before the assertion is reached. Client: restoring|| "Unknown"dropsinvents no name when the wire carries none.What the tests do not prove. The client's first row (
labels a sourceless rule ability…) stays green under the counter-probe — it supplies asource_name, so the fallback chain short-circuits before the deleted literal. It is a pin, not evidence; the second row is the one that covers the change. That was measured, not assumed: the first version of this PR had only the first row and the counter-probe passed.cargo test -p phase-engine: 19404 + 5202 passed, 0 failed.cargo fmt --all,cargo clippy -p phase-engine --all-targets -D warnings, andtsc --noEmitclean. Client tests run directly throughnode_modules/.bin/vitest;pnpmwas deliberately not invoked, since its pre-run dependency check wanted to purge and reinstallnode_modules. (Tilt was not running in this checkout.)Open gap, deliberately not closed
The stronger invariant "every stack entry names its source" is false today, and this PR does not pretend otherwise. Asserting it fails 53 existing tests — delayed triggers (CR 603.7d) carry neither a captured source nor a description — and the middle form (
objectsmust containsource_id) fails 10 more whose fixtures name a source id they never insert. Both groups remain nameable by a viewer, the first throughsource_idand the second in any real game, so neither is this defect. Closing that is separate work.Also not covered: whether a viewer now resolves the printed helper card face (e.g. Aetherdrift's
Start your engines! // Max speed) for these entries. The name is correct on the wire and the fallback renders it; whether the image lookup happens to match a token printing by that name is not asserted here and should not be relied on.Summary by CodeRabbit
Bug Fixes
Tests