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// Copyright (c) 2010-2013 AlphaSierraPapa for the SharpDevelop Team
//
// Permission is hereby granted, free of charge, to any person obtaining a copy of this
// software and associated documentation files (the "Software"), to deal in the Software
// without restriction, including without limitation the rights to use, copy, modify, merge,
// publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons
// to whom the Software is furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in all copies or
// substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED,
// INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR
// PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE
// FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
// DEALINGS IN THE SOFTWARE.
using System;
using System.Threading;
using ICSharpCode.NRefactory.CSharp.TypeSystem;
using ICSharpCode.NRefactory.Semantics;
using ICSharpCode.NRefactory.TypeSystem;
namespace ICSharpCode.NRefactory.CSharp.Resolver
{
/// <summary>
/// Helper class that resolves the node at a specified location.
/// Can be used for implementing tool tips.
/// </summary>
public static class ResolveAtLocation
{
public static ResolveResult Resolve (ICompilation compilation, CSharpUnresolvedFile unresolvedFile, SyntaxTree syntaxTree, TextLocation location,
CancellationToken cancellationToken = default(CancellationToken))
{
return Resolve (new Lazy<ICompilation>(() => compilation), unresolvedFile, syntaxTree, location, cancellationToken);
}
public static ResolveResult Resolve(Lazy<ICompilation> compilation, CSharpUnresolvedFile unresolvedFile, SyntaxTree syntaxTree, TextLocation location,
CancellationToken cancellationToken = default(CancellationToken))
{
AstNode node;
return Resolve(compilation, unresolvedFile, syntaxTree, location, out node, cancellationToken);
}
public static ResolveResult Resolve (ICompilation compilation, CSharpUnresolvedFile unresolvedFile, SyntaxTree syntaxTree, TextLocation location, out AstNode node,
CancellationToken cancellationToken = default(CancellationToken))
{
return Resolve (new Lazy<ICompilation>(() => compilation), unresolvedFile, syntaxTree, location, out node, cancellationToken);
}
public static ResolveResult Resolve(Lazy<ICompilation> compilation, CSharpUnresolvedFile unresolvedFile, SyntaxTree syntaxTree, TextLocation location, out AstNode node,
CancellationToken cancellationToken = default(CancellationToken))
{
node = syntaxTree.GetNodeAt(location);
if (node == null || node is ArrayInitializerExpression)
return null;
if (node.Parent is UsingAliasDeclaration && node.Role == UsingAliasDeclaration.AliasRole) {
var r = new CSharpAstResolver(compilation.Value, syntaxTree, unresolvedFile);
return r.Resolve(((UsingAliasDeclaration)node.Parent).Import, cancellationToken);
}
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) {
// 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, syntaxTree, unresolvedFile);
ResolveResult rr = resolver.Resolve(node, cancellationToken);
MethodGroupResolveResult mgrr = rr as MethodGroupResolveResult;
if (mgrr != null) {
// For method groups, resolve the parent invocation instead.
if (parentInvocation != null)
return resolver.Resolve(parentInvocation);
if (node is Expression) {
// If it's not an invocation, try if it's a conversion to a delegate type:
Conversion c = resolver.GetConversion((Expression)node, cancellationToken);
if (c.IsMethodGroupConversion)
return new MemberResolveResult(mgrr.TargetResult, c.Method);
}
}
return rr;
}
}
}
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