manabrew_engine/replacement/
replace_counter.rs

1//! Replacement logic for `Event$ Counter` (countering a spell).
2//!
3//! Mirrors Java `ReplaceCounter.java` in `forge/game/replacement/`.
4
5use crate::card::Card;
6use crate::game::GameState;
7use crate::ids::CardId;
8
9use super::replacement_effect::ReplacementEffect;
10use super::replacement_handler::ReplacementEvent;
11use super::replacement_result::ReplacementResult;
12use super::replacement_type::ReplacementType;
13use crate::card_trait_base::CardTrait;
14
15/// Mirrors Java `ReplaceCounter.canReplace()`.
16pub fn can_replace(
17    effect: &ReplacementEffect,
18    event: &ReplacementEvent,
19    game: &GameState,
20    source_card: &Card,
21) -> bool {
22    if effect.event != ReplacementType::Counter {
23        return false;
24    }
25    let target_id = match event {
26        ReplacementEvent::Counter { card } => *card,
27        _ => return false,
28    };
29    let target_card = &game.cards[target_id.index()];
30    if let Some(valid) = effect.ir.valid_card_selector.as_ref() {
31        if !effect.matches_compiled_valid_card(valid, target_card, source_card) {
32            return false;
33        }
34    }
35    true
36}
37
38/// CantHappen layer prevents countering (e.g. "can't be countered").
39pub fn execute(
40    _effect: &ReplacementEffect,
41    _event: &mut ReplacementEvent,
42    _game: &GameState,
43    _source_card_id: CardId,
44) -> ReplacementResult {
45    ReplacementResult::Replaced
46}
manabrew_engine/replacement/replace_counter.rs

manabrew_engine/replacement/
replace_counter.rs
