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Viewing changes to contrib/ICSharpCode.NRefactory.CSharp/Resolver/ResolveAtLocation.cs

  • Committer: Package Import Robot
  • Author(s): Jo Shields
  • Date: 2013-05-12 09:46:03 UTC
  • mto: This revision was merged to the branch mainline in revision 29.
  • Revision ID: package-import@ubuntu.com-20130512094603-mad323bzcxvmcam0
Tags: upstream-4.0.5+dfsg
Import upstream version 4.0.5+dfsg

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contrib/ICSharpCode.NRefactory.CSharp/Resolver/ResolveAtLocation.cs
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// Copyright (c) AlphaSierraPapa for the SharpDevelop Team
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// 
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// Permission is hereby granted, free of charge, to any person obtaining a copy of this
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// software and associated documentation files (the "Software"), to deal in the Software
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// without restriction, including without limitation the rights to use, copy, modify, merge,
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// publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons
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// to whom the Software is furnished to do so, subject to the following conditions:
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// 
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// The above copyright notice and this permission notice shall be included in all copies or
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// substantial portions of the Software.
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// 
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED,
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// INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR
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// PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE
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// FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
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// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
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// DEALINGS IN THE SOFTWARE.
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using System;
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using System.Threading;
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using ICSharpCode.NRefactory.CSharp.TypeSystem;
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using ICSharpCode.NRefactory.Semantics;
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using ICSharpCode.NRefactory.TypeSystem;
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namespace ICSharpCode.NRefactory.CSharp.Resolver
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{
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        /// <summary>
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        /// Helper class that resolves the node at a specified location.
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        /// Can be used for implementing tool tips.
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        /// </summary>
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        public static class ResolveAtLocation
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        {
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                public static ResolveResult Resolve (ICompilation compilation, CSharpParsedFile parsedFile, CompilationUnit cu, TextLocation location,
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                                                    CancellationToken cancellationToken = default(CancellationToken))
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                {
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                        return Resolve (new Lazy<ICompilation>(() => compilation), parsedFile, cu, location, cancellationToken);
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                }
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                public static ResolveResult Resolve(Lazy<ICompilation> compilation, CSharpParsedFile parsedFile, CompilationUnit cu, TextLocation location,
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                                                    CancellationToken cancellationToken = default(CancellationToken))
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                {
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                        AstNode node;
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                        return Resolve(compilation, parsedFile, cu, location, out node, cancellationToken);
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                }
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                public static ResolveResult Resolve (ICompilation compilation, CSharpParsedFile parsedFile, CompilationUnit cu, TextLocation location, out AstNode node,
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                                                    CancellationToken cancellationToken = default(CancellationToken))
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                {
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                        return Resolve (new Lazy<ICompilation>(() => compilation), parsedFile, cu, location, out node, cancellationToken);
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                }
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                public static ResolveResult Resolve(Lazy<ICompilation> compilation, CSharpParsedFile parsedFile, CompilationUnit cu, TextLocation location, out AstNode node,
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                                                    CancellationToken cancellationToken = default(CancellationToken))
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                {
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                        node = cu.GetNodeAt(location);
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                        if (node == null)
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                                return null;
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                        if (CSharpAstResolver.IsUnresolvableNode(node)) {
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                                if (node is Identifier) {
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                                        node = node.Parent;
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                                } else if (node.NodeType == NodeType.Token) {
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                                        if (node.Parent is IndexerExpression || node.Parent is ConstructorInitializer) {
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                                                // There's no other place where one could hover to see the indexer's tooltip,
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                                                // so we need to resolve it when hovering over the '[' or ']'.
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                                                // For constructor initializer, the same applies to the 'base'/'this' token.
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                                                node = node.Parent;
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                                        } else {
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                                                return null;
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                                        }
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                                } else {
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                                        // don't resolve arbitrary nodes - we don't want to show tooltips for everything
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                                        return null;
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                                }
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                        } else {
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                                // It's a resolvable node.
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                                // However, we usually don't want to show the tooltip everywhere
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                                // For example, hovering with the mouse over an empty line between two methods causes
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                                // node==TypeDeclaration, but we don't want to show any tooltip.
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                                if (!node.GetChildByRole(Roles.Identifier).IsNull) {
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                                        // We'll suppress the tooltip for resolvable nodes if there is an identifier that
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                                        // could be hovered over instead:
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                                        return null;
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                                }
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                        }
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                        if (node == null)
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                                return null;
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                        if (node.Parent is ObjectCreateExpression && node.Role == Roles.Type) {
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                                node = node.Parent;
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                        }
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                        InvocationExpression parentInvocation = null;
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                        if ((node is IdentifierExpression || node is MemberReferenceExpression || node is PointerReferenceExpression) && node.Role != Roles.Argument) {
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                                // we also need to resolve the invocation
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                                parentInvocation = node.Parent as InvocationExpression;
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                        }
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                        // TODO: I think we should provide an overload so that an existing CSharpAstResolver can be reused
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                        CSharpAstResolver resolver = new CSharpAstResolver(compilation.Value, cu, parsedFile);
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                        ResolveResult rr = resolver.Resolve(node, cancellationToken);
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                        if (rr is MethodGroupResolveResult && parentInvocation != null)
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                                return resolver.Resolve(parentInvocation);
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                        else
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                                return rr;
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                }
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        }
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}