48 lines
1.8 KiB
C++
48 lines
1.8 KiB
C++
/*
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Copyright (c) 2013-2014 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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#include "util/lua.h"
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#include "kernel/expr.h"
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// Placeholders are used to mark locations where additional
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// metavariables should be inserted.
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namespace lean {
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/** \brief Return a new universe level placeholder. */
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level mk_level_placeholder();
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enum class expr_placeholder_kind { Implicit, StrictImplicit, Explicit };
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/** \brief Return a new expression placeholder expression. */
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expr mk_expr_placeholder(optional<expr> const & type = none_expr(), expr_placeholder_kind k = expr_placeholder_kind::Implicit);
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inline expr mk_explicit_expr_placeholder(optional<expr> const & type = none_expr()) {
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return mk_expr_placeholder(type, expr_placeholder_kind::Explicit);
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}
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inline expr mk_strict_expr_placeholder(optional<expr> const & type = none_expr()) {
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return mk_expr_placeholder(type, expr_placeholder_kind::StrictImplicit);
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}
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/** \brief Return true if the given level is a placeholder. */
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bool is_placeholder(level const & e);
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/** \brief Return true iff the given expression is a placeholder (strict, explicit or implicit). */
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bool is_placeholder(expr const & e);
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/** \brief Return true iff the given expression is a strict placeholder. */
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bool is_strict_placeholder(expr const & e);
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/** \brief Return true iff the given expression is an explicit placeholder. */
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bool is_explicit_placeholder(expr const & e);
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/** \brief Return the type of the placeholder (if available) */
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optional<expr> placeholder_type(expr const & e);
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/** \brief Return true iff the given expression contains placeholders. */
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bool has_placeholder(expr const & e);
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void open_placeholder(lua_State * L);
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void initialize_placeholder();
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void finalize_placeholder();
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}
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