// シンプルな書き方
forge x: arcana = -5;
oracle {
    (x > 0) => unveil("x is positive");
    (x < 0) => unveil("x is negative");
    _ => unveil("x is zero");
};

// 条件文にOmen型を使う場合
oracle (x > 0) {
    (boon) => unveil("x is positive");
    (hex) => unveil("x is negative or zero");
};

// 条件文にOmen型以外を使う場合
oracle (y = x ^ 2) {
    (y > 100) => unveil("y is greater than 100");
    (y == 100) => unveil("y is equal to 100");
    _ => unveil("y is less than 100");
};

oracle (a = "abyss-lang") {
    (a == "abyss") => unveil("a is abyss");
    _ => unveil("a is not abyss");
};

// 条件文に複数の条件を使う場合
oracle (a = 3, b = 2) {
    (a == 1 && b == 2) => unveil("a is 1 and b is 2");
    (a != 1 && b == 2) => unveil("a is not 1 and b is 2");
    (a == 1 && b != 2) => unveil("a is 1 and b is not 2");
    _ => unveil("a is not 1 and b is not 2");
};

// xが正の場合xを表示、x + 5が正の場合x + 5を表示、それ以外の場合-999を表示
forge x: arcana = -10;
forge y: arcana = oracle (x > 0) {
    (boon) => reveal x;
    (hex) => {
        forge z: arcana = x + 5;
        reveal oracle (z > 0) {
            (boon) => z;
            (hex) => -999;
        };
        unveil("Not displayed");
    }
};
unveil(y);