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,
    game::GameState,
    parsing::{keys, Params},
    spellability::SpellAbility,
    trigger::TriggerType,
};

use super::trigger::TriggerBehavior;

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

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

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

    fn perform_test(
        &self,
        trigger: &super::trigger::Trigger,
        params: &RunParams,
        game: &GameState,
    ) -> bool {
        trigger.matches_optional_valid_card_filter(&self.valid_card, params.attacker, game)
    }

    fn set_triggering_objects(
        &self,
        _trigger: &super::trigger::Trigger,
        sa: &mut SpellAbility,
        params: &RunParams,
        _game: &GameState,
    ) {
        if let Some(attacker) = params.attacker {
            sa.set_triggering_object(crate::ability::AbilityKey::Attacker, attacker.0.to_string());
        }
        if let Some(blockers) = params.blocker_ids.as_ref() {
            let csv = blockers
                .iter()
                .map(|c| c.0.to_string())
                .collect::<Vec<_>>()
                .join(",");
            sa.set_triggering_object(crate::ability::AbilityKey::Blockers, &csv);
        }
        if let Some(p) = params.defending_player {
            sa.set_triggering_object(crate::ability::AbilityKey::DefendingPlayer, p.0.to_string());
        }
        if let Some(c) = params.attacked_card {
            sa.set_triggering_object(crate::ability::AbilityKey::Defender, c.0.to_string());
        } else if let Some(p) = params.attacked_player {
            sa.set_triggering_object(crate::ability::AbilityKey::Defender, p.0.to_string());
        }
    }

    fn get_important_stack_objects(
        &self,
        _trigger: &super::trigger::Trigger,
        sa: &SpellAbility,
    ) -> String {
        let attacker = sa
            .get_triggering_object(crate::ability::AbilityKey::Attacker)
            .unwrap_or("");
        let num_blockers = sa
            .get_triggering_object(crate::ability::AbilityKey::Blockers)
            .map(|s| {
                if s.is_empty() {
                    0
                } else {
                    s.split(',').count()
                }
            })
            .unwrap_or(0);
        format!("Attacker: {}, Number Blockers: {}", attacker, num_blockers)
    }
}