b88b98ac22
The idea is to avoid a "tsunami" of error messages when a heavily used theorem breaks in the beginning of the file
33 lines
1.5 KiB
C++
33 lines
1.5 KiB
C++
/*
|
|
Copyright (c) 2015 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 "kernel/environment.h"
|
|
|
|
namespace lean {
|
|
/** \brief Auxiliary exception that stores the "real" exception, and a new
|
|
environment that should replace the one in the parser.
|
|
This is a trick to simulate commands that had "partial success".
|
|
Example: we may have failed to type check a proof, but we may have succeeded
|
|
in checking the theorem's type. So, we may store the theorem as an axiom, and
|
|
continue. This feature is useful to avoid a cascade of error messages when
|
|
a heavily useful theorem is broken in the beginning of the file.
|
|
*/
|
|
class update_environment_exception : public exception {
|
|
environment m_env;
|
|
std::shared_ptr<throwable> m_exception;
|
|
public:
|
|
update_environment_exception(environment const & env, std::shared_ptr<throwable> const & ex):
|
|
exception("exception"), m_env(env), m_exception(ex) {}
|
|
virtual ~update_environment_exception() {}
|
|
virtual throwable * clone() const { return new update_environment_exception(m_env, m_exception); }
|
|
virtual void rethrow() const { throw *this; }
|
|
virtual char const * what() const noexcept { return m_exception->what(); }
|
|
throwable const & get_exception() const { return *(m_exception.get()); }
|
|
environment const & get_env() const { return m_env; }
|
|
};
|
|
}
|