2014-02-23 21:19:39 +00:00
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/*
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Copyright (c) 2014 Microsoft Corporation. All rights reserved.
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Released under Apache 2.0 license as described in the file LICENSE.
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Author: Leonardo de Moura
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*/
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#pragma once
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2014-02-23 22:41:44 +00:00
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#include <algorithm>
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2014-02-23 21:19:39 +00:00
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#include "kernel/expr.h"
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#include "kernel/justification.h"
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namespace lean {
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/**
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\brief The lean kernel type checker produces two kinds of constraints:
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2014-02-23 21:19:39 +00:00
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- Equality constraint: t ≈ s
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The terms t and s must be definitionally equal.
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- Universe level constaint: l = m
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2014-02-23 21:19:39 +00:00
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The universe level l must be less than or equal to m.
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2014-05-10 03:25:27 +00:00
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\remark The constraints are only generated if the input term contains
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metavariables or level metavariables.
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2014-02-23 21:19:39 +00:00
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Each constraint is associated with a justification object.
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*/
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2014-06-03 07:46:28 +00:00
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enum class constraint_kind { Eq, Level };
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2014-02-23 21:19:39 +00:00
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struct constraint_cell;
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class constraint {
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constraint_cell * m_ptr;
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constraint(constraint_cell * ptr);
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public:
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constraint(constraint const & c);
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constraint(constraint && s);
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~constraint();
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constraint_kind kind() const;
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unsigned hash() const;
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justification const & get_justification() const;
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constraint & operator=(constraint const & c);
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constraint & operator=(constraint && c);
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friend bool is_eqp(constraint const & c1, constraint const & c2) { return c1.m_ptr == c2.m_ptr; }
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friend void swap(constraint & l1, constraint & l2) { std::swap(l1, l2); }
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friend constraint mk_eq_cnstr(expr const & lhs, expr const & rhs, justification const & j);
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friend constraint mk_level_cnstr(level const & lhs, level const & rhs, justification const & j);
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constraint_cell * raw() const { return m_ptr; }
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};
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bool operator==(constraint const & c1, constraint const & c2);
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inline bool operator!=(constraint const & c1, constraint const & c2) { return !(c1 == c2); }
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2014-02-25 00:30:56 +00:00
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constraint mk_eq_cnstr(expr const & lhs, expr const & rhs, justification const & j);
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constraint mk_level_cnstr(level const & lhs, level const & rhs, justification const & j);
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2014-04-28 17:53:53 +00:00
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inline bool is_eq_cnstr(constraint const & c) { return c.kind() == constraint_kind::Eq; }
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inline bool is_level_cnstr(constraint const & c) { return c.kind() == constraint_kind::Level; }
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2014-05-10 03:25:27 +00:00
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/** \brief Return the lhs of an equality constraint. */
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expr const & cnstr_lhs_expr(constraint const & c);
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/** \brief Return the rhs of an equality constraint. */
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expr const & cnstr_rhs_expr(constraint const & c);
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/** \brief Return the lhs of an level constraint. */
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level const & cnstr_lhs_level(constraint const & c);
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/** \brief Return the rhs of an level constraint. */
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level const & cnstr_rhs_level(constraint const & c);
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2014-05-10 03:25:27 +00:00
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/** \brief Update equality constraint c with new_lhs, new_rhs and justification. */
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constraint updt_eq_cnstr(constraint const & c, expr const & new_lhs, expr const & new_rhs, justification const & new_jst);
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/** \brief Update equality constraint c with new_lhs and new_rhs, but keeping the same justification. */
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constraint updt_eq_cnstr(constraint const & c, expr const & new_lhs, expr const & new_rhs);
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/** \brief Update level constraint c with new_lhs, new_rhs and justification. */
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constraint updt_level_cnstr(constraint const & c, level const & new_lhs, level const & new_rhs, justification const & new_jst);
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/** \brief Update level constraint c with new_lhs and new_rhs, but keeping the same justification. */
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constraint updt_level_cnstr(constraint const & c, level const & new_lhs, level const & new_rhs);
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/** \brief Printer for debugging purposes */
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std::ostream & operator<<(std::ostream & out, constraint const & c);
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typedef list<constraint> constraints;
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inline constraints add(constraints const & cs, constraint const & c) { return cons(c, cs); }
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}
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