manabrew-engine 0.4.1

Magic: The Gathering rules engine — a Rust port of Forge
Documentation 
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use serde::{Deserialize, Serialize};

use crate::event::RunParams;
use crate::game::GameState;
use crate::parsing::{keys, Params};
use crate::spellability::SpellAbility;
use crate::trigger::TriggerType;

use super::trigger::{Trigger, TriggerBehavior};

#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct TriggerExploited {
    pub valid_card: Option<crate::parsing::CompiledSelector>,
    pub valid_source: Option<crate::parsing::CompiledSelector>,
}

impl TriggerExploited {
    pub fn parse(params: &Params) -> Box<dyn TriggerBehavior> {
        Box::new(Self {
            valid_card: params.selector_cloned(keys::VALID_CARD),
            valid_source: params.selector_cloned(keys::VALID_SOURCE),
        })
    }
}

#[typetag::serde]
impl TriggerBehavior for TriggerExploited {
    fn trigger_type(&self) -> TriggerType {
        TriggerType::Exploited
    }

    fn perform_test(&self, trigger: &Trigger, params: &RunParams, game: &GameState) -> bool {
        if !trigger.matches_optional_valid_card_filter(
            &self.valid_card,
            params.exploited_card,
            game,
        ) {
            return false;
        }
        trigger.matches_optional_valid_card_filter(&self.valid_source, params.card, game)
    }

    fn set_triggering_objects(
        &self,
        _trigger: &Trigger,
        sa: &mut SpellAbility,
        params: &RunParams,
        _game: &GameState,
    ) {
        if let Some(exploited) = params.exploited_card {
            sa.set_triggering_object(
                crate::ability::AbilityKey::Exploited,
                exploited.0.to_string(),
            );
        }
        if let Some(card) = params.card {
            sa.set_triggering_object(crate::ability::AbilityKey::Card, card.0.to_string());
        }
    }

    fn get_important_stack_objects(&self, _trigger: &Trigger, sa: &SpellAbility) -> String {
        // Java: "Exploited: " + Exploited + ", Exploiter: " + Card
        format!(
            "Exploited: {}, Exploiter: {}",
            sa.get_triggering_object(crate::ability::AbilityKey::Exploited)
                .unwrap_or_default(),
            sa.get_triggering_object(crate::ability::AbilityKey::Card)
                .unwrap_or_default()
        )
    }
}