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Viewing changes to external/nrefactory/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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external/nrefactory/ICSharpCode.NRefactory.CSharp/Resolver/ResolveAtLocation.cs
 
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// Copyright (c) 2010-2013 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, CSharpUnresolvedFile unresolvedFile, SyntaxTree syntaxTree, TextLocation location,
 
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                                                    CancellationToken cancellationToken = default(CancellationToken))
 
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                {
 
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                        return Resolve (new Lazy<ICompilation>(() => compilation), unresolvedFile, syntaxTree, location, cancellationToken);
 
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                }
 
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                public static ResolveResult Resolve(Lazy<ICompilation> compilation, CSharpUnresolvedFile unresolvedFile, SyntaxTree syntaxTree, 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, unresolvedFile, syntaxTree, location, out node, cancellationToken);
 
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                }
 
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                public static ResolveResult Resolve (ICompilation compilation, CSharpUnresolvedFile unresolvedFile, SyntaxTree syntaxTree, 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), unresolvedFile, syntaxTree, location, out node, cancellationToken);
 
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                }
 
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                public static ResolveResult Resolve(Lazy<ICompilation> compilation, CSharpUnresolvedFile unresolvedFile, SyntaxTree syntaxTree, TextLocation location, out AstNode node,
 
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                                                    CancellationToken cancellationToken = default(CancellationToken))
 
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                {
 
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                        node = syntaxTree.GetNodeAt(location);
 
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                        if (node == null || node is ArrayInitializerExpression)
 
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                                return null;
 
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                        if (node.Parent is UsingAliasDeclaration && node.Role == UsingAliasDeclaration.AliasRole) {
 
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                                var r = new CSharpAstResolver(compilation.Value, syntaxTree, unresolvedFile);
 
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                                return r.Resolve(((UsingAliasDeclaration)node.Parent).Import, cancellationToken);
 
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                        }
 
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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, syntaxTree, unresolvedFile);
 
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                        ResolveResult rr = resolver.Resolve(node, cancellationToken);
 
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                        MethodGroupResolveResult mgrr = rr as MethodGroupResolveResult;
 
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                        if (mgrr != null) {
 
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                                // For method groups, resolve the parent invocation instead.
 
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                                if (parentInvocation != null)
 
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                                        return resolver.Resolve(parentInvocation);
 
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                                if (node is Expression) {
 
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                                        // If it's not an invocation, try if it's a conversion to a delegate type:
 
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                                        Conversion c = resolver.GetConversion((Expression)node, cancellationToken);
 
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                                        if (c.IsMethodGroupConversion)
 
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                                                return new MemberResolveResult(mgrr.TargetResult, c.Method);
 
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                                }
 
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                        }
 
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                        return rr;
 
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                }
 
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        }
 
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}