manabrew-engine 0.4.1

Magic: The Gathering rules engine — a Rust port of Forge
Documentation 
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use forge_foundation::ZoneType;

use crate::card::{valid_filter, Card};
use crate::parsing::CompiledSelector;
use crate::staticability::StaticMode;

pub fn blocks_each_combat_if_able(cards: &[Card], creature: &Card) -> bool {
    for source in cards.iter().filter(|c| c.zone == ZoneType::Battlefield) {
        for st_ab in source
            .static_abilities
            .iter()
            .filter(|sa| sa.check_mode(&StaticMode::MustBlock))
        {
            if matches_valid_creature(st_ab.ir.valid_creature.as_ref(), creature, source) {
                return true;
            }
        }
    }
    false
}

pub fn apply_blocks_each_combat_if_able(
    st_ab: &crate::staticability::StaticAbility,
    creature: &Card,
    source: &Card,
) -> bool {
    matches_valid_creature(st_ab.ir.valid_creature.as_ref(), creature, source)
}

fn matches_valid_creature(valid: Option<&CompiledSelector>, card: &Card, source: &Card) -> bool {
    match valid {
        None => card.is_creature(),
        Some(selector) => valid_filter::matches_valid_card_selector(selector, card, source),
    }
}