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c958cd65eb
This will make it easier to incrementally implement syntax nodes, while allowing us to embed nodes that we do know about inside ones that we don't. https://bugs.swift.org/browse/SR-4062
90 lines
2.3 KiB
C++
90 lines
2.3 KiB
C++
//===--- UnknownSyntax.h - Swift Unknown Syntax Interface -----------------===//
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//
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// This source file is part of the Swift.org open source project
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//
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// Copyright (c) 2014 - 2017 Apple Inc. and the Swift project authors
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// Licensed under Apache License v2.0 with Runtime Library Exception
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//
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// See https://swift.org/LICENSE.txt for license information
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// See https://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
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//
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//===----------------------------------------------------------------------===//
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#ifndef SWIFT_SYNTAX_UNKNOWNSYNTAX_H
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#define SWIFT_SYNTAX_UNKNOWNSYNTAX_H
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#include "swift/Syntax/SyntaxData.h"
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#include "swift/Syntax/Syntax.h"
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#include <vector>
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namespace swift {
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namespace syntax {
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#pragma mark unknown-syntax Data
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class UnknownSyntaxData : public SyntaxData {
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friend class SyntaxData;
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friend class UnknownSyntax;
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friend struct SyntaxFactory;
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friend class LegacyASTTransformer;
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protected:
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std::vector<RC<SyntaxData>> CachedChildren;
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UnknownSyntaxData(const RC<RawSyntax> Raw,
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const SyntaxData *Parent = nullptr,
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const CursorIndex IndexInParent = 0);
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public:
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static RC<UnknownSyntaxData> make(RC<RawSyntax> Raw,
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const SyntaxData *Parent = nullptr,
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CursorIndex IndexInParent = 0);
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size_t getNumChildren() const {
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return CachedChildren.size();
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}
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/// Get the child at the given Index.
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///
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/// Precondition: Index <= getNumChildren();
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Syntax getChild(size_t Index) const;
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static bool classof(const SyntaxData *SD) {
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return SD->isUnknown();
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}
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};
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#pragma mark unknown-syntax API
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/// A chunk of "unknown" syntax.
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///
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/// Effectively wraps a tree of RawSyntax.
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///
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/// This should not be vended by SyntaxFactory.
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class UnknownSyntax : public Syntax {
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friend struct SyntaxFactory;
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friend class Syntax;
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using DataType = UnknownSyntaxData;
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public:
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UnknownSyntax(const RC<SyntaxData> Root, const UnknownSyntaxData *Data);
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/// Get the number of child nodes in this piece of syntax, not including
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/// tokens.
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size_t getNumChildren() const;
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/// Get the Nth child of this piece of syntax.
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Syntax getChild(const size_t N) const;
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static bool classof(const Syntax *S) {
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return S->isUnknown();
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}
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};
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} // end namespace syntax
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} // end namespace swift
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#endif // SWIFT_SYNTAX_UNKNOWNSYNTAX_H
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