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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
100 lines
2.9 KiB
C++
100 lines
2.9 KiB
C++
//===--- UnknownSyntax.cpp - Swift Unknown Syntax Implementation ---------===//
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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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#include "swift/Syntax/TokenSyntax.h"
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#include "swift/Syntax/UnknownSyntax.h"
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using namespace swift;
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using namespace swift::syntax;
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#pragma mark - unknown-syntax Data
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UnknownSyntaxData::UnknownSyntaxData(const RC<RawSyntax> Raw,
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const SyntaxData *Parent,
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const CursorIndex IndexInParent)
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: SyntaxData(Raw, Parent, IndexInParent) {
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assert(Raw->isUnknown());
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for (auto RawChild : Raw->Layout) {
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if (!RawChild->isToken()) {
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CachedChildren.emplace_back(nullptr);
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}
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}
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}
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RC<UnknownSyntaxData> UnknownSyntaxData::make(RC<RawSyntax> Raw,
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const SyntaxData *Parent,
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CursorIndex IndexInParent) {
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auto UnknownRaw = RawSyntax::make(SyntaxKind::Unknown, Raw->Layout,
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Raw->Presence);
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return RC<UnknownSyntaxData> {
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new UnknownSyntaxData { UnknownRaw, Parent, IndexInParent }
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};
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}
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#pragma mark - unknown-syntax API
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UnknownSyntax::UnknownSyntax(const RC<SyntaxData> Root,
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const UnknownSyntaxData *Data)
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: Syntax(Root, Data) {}
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size_t UnknownSyntax::getNumChildren() const {
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size_t Count = 0;
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for (auto Child : getRaw()->Layout) {
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if (Child->isToken()) {
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continue;
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}
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++Count;
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}
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return Count;
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}
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Syntax UnknownSyntax::getChild(const size_t N) const {
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auto *MyData = getUnsafeData<UnknownSyntax>();
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if (auto RealizedChild = MyData->CachedChildren[N]) {
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return Syntax { Root, RealizedChild.get() };
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}
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assert(N < getNumChildren());
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assert(N < getRaw()->Layout.size());
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CursorIndex ChildLayoutIndex = 0;
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for (size_t LayoutIndex = 0, Left = N;
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LayoutIndex < getRaw()->Layout.size();
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++LayoutIndex) {
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auto Child = getRaw()->Layout[LayoutIndex];
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if (Child->isToken()) {
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continue;
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}
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ChildLayoutIndex = LayoutIndex;
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if (Left == 0) {
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break;
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}
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--Left;
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}
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auto RawChild = getRaw()->Layout[ChildLayoutIndex];
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assert(RawChild->Kind != SyntaxKind::Token);
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auto &ChildPtr = *reinterpret_cast<std::atomic<uintptr_t>*>(
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MyData->CachedChildren.data() + N);
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SyntaxData::realizeSyntaxNode<Syntax>(ChildPtr, RawChild, MyData,
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ChildLayoutIndex);
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return Syntax { Root, MyData->CachedChildren[N].get() };
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}
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