56 lines
2.1 KiB
C
56 lines
2.1 KiB
C
|
/*
|
||
|
|
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 "kernel/environment.h"
|
||
|
|
|
||
|
|
namespace lean {
|
||
|
|
/** \brief Object to simulate delayed justification creation. */
|
||
|
|
class delayed_justification {
|
||
|
|
optional<justification> m_jst;
|
||
|
|
std::function<justification()> m_mk;
|
||
|
|
public:
|
||
|
|
template<typename Mk> delayed_justification(Mk && mk):m_mk(mk) {}
|
||
|
|
justification get() { if (!m_jst) { m_jst = m_mk(); } return *m_jst; }
|
||
|
|
};
|
||
|
|
|
||
|
|
/** \brief Auxiliary exception used to sign that constraints cannot be created when \c m_cnstrs_enabled flag is false. */
|
||
|
|
struct add_cnstr_exception {};
|
||
|
|
|
||
|
|
class converter {
|
||
|
|
public:
|
||
|
|
/** \brief Abstract context that must be provided to a converter object. */
|
||
|
|
class context {
|
||
|
|
virtual bool enable_cnstrs(bool flag) = 0;
|
||
|
|
public:
|
||
|
|
virtual name mk_fresh_name() = 0;
|
||
|
|
virtual expr infer_type(expr const & e) = 0;
|
||
|
|
virtual void add_cnstr(constraint const & c) = 0;
|
||
|
|
class disable_cnstrs_scope {
|
||
|
|
context & m_ctx;
|
||
|
|
bool m_old;
|
||
|
|
public:
|
||
|
|
disable_cnstrs_scope(context & ctx):m_ctx(ctx), m_old(m_ctx.enable_cnstrs(false)) {}
|
||
|
|
~disable_cnstrs_scope() { m_ctx.enable_cnstrs(m_old); }
|
||
|
|
};
|
||
|
|
};
|
||
|
|
|
||
|
|
virtual ~converter() {}
|
||
|
|
|
||
|
|
virtual expr whnf(expr const & e, context & c) = 0;
|
||
|
|
virtual bool is_conv(expr const & t, expr const & s, context & c, delayed_justification & j) = 0;
|
||
|
|
virtual bool is_def_eq(expr const & t, expr const & s, context & c, delayed_justification & j) = 0;
|
||
|
|
bool is_conv(expr const & t, expr const & s, context & c);
|
||
|
|
bool is_def_eq(expr const & t, expr const & s, context & c);
|
||
|
|
};
|
||
|
|
|
||
|
|
std::unique_ptr<converter> mk_dummy_converter();
|
||
|
|
std::unique_ptr<converter> mk_default_converter(environment const & env,
|
||
|
|
optional<module_idx> mod_idx = optional<module_idx>(),
|
||
|
|
bool memoize = true,
|
||
|
|
name_set const & extra_opaque = name_set());
|
||
|
|
}
|