lean2/src/kernel/kernel_exception.h

/*
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 <vector>
#include "util/exception.h"
#include "util/sexpr/options.h"
#include "kernel/context.h"
#include "kernel/environment.h"
#include "kernel/formatter.h"

namespace lean {
class environment;
/** \brief Base class for all kernel exceptions. */
class kernel_exception : public exception {
protected:
    environment m_env;
public:
    kernel_exception(environment const & env):m_env(env) {}
    kernel_exception(environment const & env, char const * msg):exception(msg), m_env(env) {}
    kernel_exception(environment const & env, sstream const & strm):exception(strm), m_env(env) {}
    virtual ~kernel_exception() noexcept {}
    environment const & get_environment() const { return m_env; }
    /**
        \brief Return a reference (if available) to the main expression associated with this exception.
        This information is used to provide better error messages.
    */
    virtual optional<expr> get_main_expr() const { return none_expr(); }
    virtual format pp(formatter const & fmt, options const & opts) const;
    virtual exception * clone() const { return new kernel_exception(m_env, m_msg.c_str()); }
    virtual void rethrow() const { throw *this; }
};

[[ noreturn ]] void throw_kernel_exception(environment const & env, char const * msg, optional<expr> const & m = none_expr());
[[ noreturn ]] void throw_kernel_exception(environment const & env, sstream const & strm,
                                           optional<expr> const & m = none_expr());
[[ noreturn ]] void throw_kernel_exception(environment const & env, char const * msg, optional<expr> const & m, pp_fn const & fn);
[[ noreturn ]] void throw_kernel_exception(environment const & env, optional<expr> const & m, pp_fn const & fn);
[[ noreturn ]] void throw_kernel_exception(environment const & env, char const * msg, expr const & m, pp_fn const & fn);
[[ noreturn ]] void throw_kernel_exception(environment const & env, expr const & m, pp_fn const & fn);
[[ noreturn ]] void throw_unknown_declaration(environment const & env, name const & n);
[[ noreturn ]] void throw_already_declared(environment const & env, name const & n);
}