Assignment-3/tree.hpp

#pragma once
#include <memory>
#include <vector>

enum class binop {
    plus,
    minus,
    times,
    divide,
    land,
    lor,
    eq,
    neq,
    lt,
    lte,
    gt,
    gte
};

enum class unop {
    lnot
};

struct expr {
    virtual ~expr() = default;
};

typedef std::unique_ptr<expr> expr_ptr;

struct expr_binop : expr {
    binop op;
    expr_ptr left;
    expr_ptr right;

    expr_binop(binop nop, expr_ptr l, expr_ptr r) :
        op(nop), left(std::move(l)), right(std::move(r)) {}
};

struct expr_unop : expr {
    unop op;
    expr_ptr child;

    expr_unop(unop nop, expr_ptr c) :
        op(nop), child(std::move(c)) {}
};

struct expr_assign : expr {
    std::string var;
    expr_ptr child;

    expr_assign(std::string v, expr_ptr c) :
        var(std::move(v)), child(std::move(c)) {}
};

template <typename T, typename ... Ts>
expr_ptr make_expr(Ts&& ... ts) {
    return expr_ptr(new T(std::move(ts)...));
}

struct stmt {
    virtual ~stmt() = default;
};

typedef std::unique_ptr<stmt> stmt_ptr;

struct stmt_block : stmt {
    std::vector<stmt_ptr> children;
};

struct stmt_if : stmt {
    expr_ptr cond;
    stmt_ptr then;
    stmt_ptr els;

    stmt_if(expr_ptr c, stmt_ptr t, stmt_ptr e = nullptr) :
        cond(std::move(c)), then(std::move(t)), els(std::move(e)) {}
};

struct stmt_while : stmt {
    expr_ptr cond;
    stmt_ptr body;

    stmt_while(expr_ptr c, stmt_ptr b)
        : cond(std::move(c)), body(std::move(b)) {}
};

struct stmt_break : stmt {

};

template <typename T, typename ... Ts>
stmt_ptr make_stmt(Ts&& ... ts) {
    return stmt_ptr(new T(std::move(ts)...));
}