/*
Copyright (c) 2013 Microsoft Corporation. All rights reserved.
Released under Apache 2.0 license as described in the file LICENSE.

Author: Leonardo de Moura
*/
#pragma once
#include <memory>
#include <utility>
#include "util/sexpr/options.h"

namespace lean {
class expr;
class environment;

class formatter {
    std::function<format(expr const &, options const &)> m_fn;
    options                             m_options;
public:
    formatter(options const & o, std::function<format(expr const &, options const &)> const & fn):m_fn(fn), m_options(o) {}
    format operator()(expr const & e) const { return m_fn(e, m_options); }
    options const & get_options() const { return m_options; }
    formatter update_options(options const & o) const { return formatter(o, m_fn); }
};

typedef std::function<formatter(environment const &, options const &)> formatter_factory;

std::ostream & operator<<(std::ostream & out, expr const & e);

typedef std::function<format(formatter const &)> pp_fn;

void set_print_fn(std::function<void(std::ostream &, expr const &)> const & fn);
}