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manabrew_engine/ability/effects/
replace_mana_effect.rs

1//! ReplaceMana effect — replace mana production with different mana.
2//!
3//! Ported from Java's `ReplaceManaEffect.java`.
4
5use super::EffectContext;
6
7/// Struct form of this effect so it can participate in the
8/// `SpellAbilityEffect` trait hierarchy — mirrors Java's
9/// `ReplaceManaEffect` class extending `SpellAbilityEffect`.
10#[manabrew_engine_macros::spell_effect(ReplaceManaEffect)]
11fn resolve(ctx: &mut EffectContext, sa: &crate::spellability::SpellAbility) {
12    // Mana replacement is handled by the mana system's replacement handler.
13    if let Some(source_id) = sa.source {
14        if let Some(val) = sa.ir.mana_replacement.as_deref() {
15            ctx.game
16                .card_mut(source_id)
17                .set_s_var("ManaReplacement", val);
18        }
19    }
20}