const Token = @import("Token.zig");

pub const Expr = union(enum) {
    binary: Binary,
    grouping: Grouping,
    literal: Literal,
    unary: Unary,

    const Binary = struct {
        left: *const Expr,
        operator: Token,
        right: *const Expr,

        pub fn init(left: *const Expr, operator: Token, right: *const Expr) Binary {
            return .{
                .left = left,
                .operator = operator,
                .right = right,
            };
        }
    };

    const Grouping = struct {
        expression: *const Expr,

        pub fn init(expression: *const Expr) Grouping {
            return .{
                .expression = expression,
            };
        }
    };

    const Literal = struct {
        value: Token.Literal,

        pub fn init(value: Token.Literal) Literal {
            return .{
                .value = value,
            };
        }
    };

    const Unary = struct {
        operator: Token,
        right: *const Expr,

        pub fn init(operator: Token, right: *const Expr) Unary {
            return Unary{
                .operator = operator,
                .right = right,
            };
        }
    };
};