C# CompilationUnit.GetNodeAt方法代码示例

		public static ResolveResult Resolve(ICompilation compilation, CSharpParsedFile parsedFile, CompilationUnit cu, TextLocation location,
		                                    CancellationToken cancellationToken = default(CancellationToken))
		{
			AstNode node = cu.GetNodeAt(location);
			if (node == null)
				return null;
			AstNode resolvableNode;
			if (node is AstType) {
				resolvableNode = node;
				if (resolvableNode.Parent is ComposedType) {
					while (resolvableNode.Parent is ComposedType)
						resolvableNode = resolvableNode.Parent;
					//node is preffered over the resolvable node. Which shouldn't be done in the case of nullables, arrays etc.
					node = resolvableNode;
				}
			} else if (node is Identifier) {
				resolvableNode = node.Parent;
			} else if (node.NodeType == NodeType.Token) {
				if (node.Parent is ConstructorInitializer) {
					resolvableNode = node.Parent;
				} else {
					return null;
				}
			} else {
				// don't resolve arbitrary nodes - we don't want to show tooltips for everything
				return null;
			}
			
			if (resolvableNode != null && resolvableNode.Parent is ObjectCreateExpression) {
				resolvableNode = resolvableNode.Parent;
			}
			
			InvocationExpression parentInvocation = null;
			if ((resolvableNode is IdentifierExpression || resolvableNode is MemberReferenceExpression || resolvableNode is PointerReferenceExpression)) {
				// we also need to resolve the invocation
				parentInvocation = resolvableNode.Parent as InvocationExpression;
			}
			
			IResolveVisitorNavigator navigator;
			if (parentInvocation != null)
				navigator = new NodeListResolveVisitorNavigator(new[] { resolvableNode, parentInvocation });
			else
				navigator = new NodeListResolveVisitorNavigator(new[] { resolvableNode });
			
			CSharpResolver resolver = new CSharpResolver(compilation);
			ResolveVisitor v = new ResolveVisitor(resolver, parsedFile, navigator);
			v.Scan(cu);
			
			// Prefer the RR from the token itself, if it was assigned a ResolveResult
			// (this can happen with the identifiers in various nodes such as catch clauses or foreach statements)
			ResolveResult rr = v.GetResolveResult(node) ?? v.GetResolveResult(resolvableNode);
			if (rr is MethodGroupResolveResult && parentInvocation != null)
				return v.GetResolveResult(parentInvocation);
			else
				return rr;
		}

		public static ResolveResult Resolve(Lazy<ICompilation> compilation, CSharpParsedFile parsedFile, CompilationUnit cu, TextLocation location, out AstNode node,
		                                    CancellationToken cancellationToken = default(CancellationToken))
		{
			node = cu.GetNodeAt(location);
			if (node == null || node is ArrayInitializerExpression)
				return null;
			if (CSharpAstResolver.IsUnresolvableNode(node)) {
				if (node is Identifier) {
					node = node.Parent;
				} else if (node.NodeType == NodeType.Token) {
					if (node.Parent is IndexerExpression || node.Parent is ConstructorInitializer) {
						Console.WriteLine (2);
						// There's no other place where one could hover to see the indexer's tooltip,
						// so we need to resolve it when hovering over the '[' or ']'.
						// For constructor initializer, the same applies to the 'base'/'this' token.
						node = node.Parent;
					} else {
						return null;
					}
				} else {
					// don't resolve arbitrary nodes - we don't want to show tooltips for everything
					return null;
				}
			} else {
				// It's a resolvable node.
				// However, we usually don't want to show the tooltip everywhere
				// For example, hovering with the mouse over an empty line between two methods causes
				// node==TypeDeclaration, but we don't want to show any tooltip.
				
				if (!node.GetChildByRole(Roles.Identifier).IsNull) {
					// We'll suppress the tooltip for resolvable nodes if there is an identifier that
					// could be hovered over instead:
					return null;
				}
			}
			if (node == null)
				return null;
			
			if (node.Parent is ObjectCreateExpression && node.Role == Roles.Type) {
				node = node.Parent;
			}
			
			InvocationExpression parentInvocation = null;
			if ((node is IdentifierExpression || node is MemberReferenceExpression || node is PointerReferenceExpression) && node.Role != Roles.Argument) {
				// we also need to resolve the invocation
				parentInvocation = node.Parent as InvocationExpression;
			}
			
			// TODO: I think we should provide an overload so that an existing CSharpAstResolver can be reused
			CSharpAstResolver resolver = new CSharpAstResolver(compilation.Value, cu, parsedFile);
			ResolveResult rr = resolver.Resolve(node, cancellationToken);
			if (rr is MethodGroupResolveResult && parentInvocation != null)
				return resolver.Resolve(parentInvocation);
			else
				return rr;
		}