/*
Copyright (c) 2014 Microsoft Corporation. All rights reserved.
Released under Apache 2.0 license as described in the file LICENSE.

Author: Leonardo de Moura
*/
#pragma once
#include "util/lua.h"
#include "kernel/expr.h"

namespace lean {
/** \brief Create an explicit expression '@ f'.
    This only affects the elaborator behavior.
*/
expr mk_explicit(expr const & e);
/** \brief Return true iff \c e is an explicit expression. */
bool is_explicit(expr const & e);
/** \brief See #is_nested_annotation */
bool is_nested_explicit(expr const & e);
/** \brief Create an explicit expression that is accepted as is
    by the elaborator.
*/
expr mk_as_is(expr const & e);
/** \brief Return true iff \c e was created with mk_as_is. */
bool is_as_is(expr const & e);
/** \brief Create an implicit expression '@^-1 f'.
    This only affects the elaborator behavior. This expression "cancels" the effect of '@'
*/
expr mk_implicit(expr const & e);
/** \brief Return true iff \c e is an implicit expression. */
bool is_implicit(expr const & e);
/** \brief Return the argument of an explicit expression.
    \pre is_explicit(e)
*/
expr const & get_explicit_arg(expr const & e);
/** \brief Return the argument of an expression created using mk_as_is.
    \pre is_as_is(e)
*/
expr const & get_as_is_arg(expr const & e);
/** \brief Return the argument of an implicit expression.
    \pre is_implicit(e)
*/
expr const & get_implicit_arg(expr const & e);
void open_explicit(lua_State * L);
}