| 1 | /*
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| 2 | * Souffle - A Datalog Compiler
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| 3 | * Copyright (c) 2021, The Souffle Developers. All rights reserved
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| 4 | * Licensed under the Universal Permissive License v 1.0 as shown at:
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| 5 | * - https://opensource.org/licenses/UPL
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| 6 | * - <souffle root>/licenses/SOUFFLE-UPL.txt
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| 7 | */
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| 8 |
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| 9 | /************************************************************************
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| 10 | *
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| 11 | * @file NodeMapperFwd.h
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| 12 | *
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| 13 | * Trivial forward decls for `NodeMapper.h`
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| 14 | *
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| 15 | ***********************************************************************/
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| 16 |
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| 17 | #pragma once
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| 18 |
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| 19 | #include "souffle/utility/DynamicCasting.h"
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| 20 | #include "souffle/utility/Types.h"
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| 21 | #include "souffle/utility/VisitorFwd.h"
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| 22 | #include <type_traits>
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| 23 | #include <utility>
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| 24 |
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| 25 | namespace souffle {
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| 26 | namespace detail {
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| 27 | /**
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| 28 | * An abstract class for manipulating AST Nodes by substitution
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| 29 | */
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| 30 | template <typename Node>
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| 31 | struct NodeMapper {
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| 32 | static_assert(is_visitable_node<Node>);
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| 33 |
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| 34 | virtual ~NodeMapper() = default;
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| 35 |
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| 36 | /**
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| 37 | * Abstract replacement method for a node.
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| 38 | *
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| 39 | * If the given nodes is to be replaced, the handed in node
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| 40 | * will be destroyed by the mapper and the returned node
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| 41 | * will become owned by the caller.
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| 42 | */
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| 43 | virtual Own<Node> operator()(Own<Node> node) const = 0;
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| 44 |
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| 45 | /**
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| 46 | * Wrapper for any subclass of the AST node hierarchy performing type casts.
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| 47 | */
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| 48 | template <typename T>
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| 49 | Own<T> operator()(Own<T> node) const {
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| 50 | return UNSAFE_cast<T>((*this)(Own<Node>(std::move(node))));
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| 51 | }
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| 52 | };
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| 53 | } // namespace detail
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| 54 |
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| 55 | template <typename R, typename Node>
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| 56 | void mapAll(R& range, detail::NodeMapper<Node> const& mapper) {
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| 57 | static_assert(std::is_assignable_v<Own<Node>, decltype(std::move(*std::begin(std::declval<R&>())))>,
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| 58 | "range/container element isn't a subtype of `Own<Node>`");
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| 59 |
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| 60 | // this one is small / common enough to define in fwd, save people from including the heavier weight stuff
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| 61 | for (auto& cur : range) {
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| 62 | cur = mapper(std::move(cur));
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| 63 | }
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| 64 | }
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| 65 |
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| 66 | } // namespace souffle
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