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//
// InlineLocalVariableAction.cs
//
// Author:
// Mike Krüger <mkrueger@xamarin.com>
//
// Copyright (c) 2012 Xamarin Inc. (http://xamarin.com)
//
// 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.Threading;
using System.Collections.Generic;
using System.Linq;
using ICSharpCode.NRefactory.Semantics;
using ICSharpCode.NRefactory.CSharp.Resolver;
namespace ICSharpCode.NRefactory.CSharp.Refactoring
{
[ContextAction("Inline local variable", Description = "Inlines a local variable.")]
public class InlineLocalVariableAction : ICodeActionProvider
{
static FindReferences refFinder = new FindReferences();
public IEnumerable<CodeAction> GetActions(RefactoringContext context)
{
if (context.IsSomethingSelected) {
yield break;
}
var node = context.GetNode<VariableDeclarationStatement>();
if (node == null || node.Variables.Count != 1) {
yield break;
}
var initializer = node.Variables.First();
if (!initializer.NameToken.Contains(context.Location) || initializer.Initializer.IsNull) {
yield break;
}
var resolveResult = context.Resolve(initializer) as LocalResolveResult;
if (resolveResult == null || resolveResult.IsError) {
yield break;
}
var unit = context.RootNode as SyntaxTree;
if (unit == null) {
yield break;
}
yield return new CodeAction(context.TranslateString("Inline local variable"), script => {
refFinder.FindLocalReferences(resolveResult.Variable, context.UnresolvedFile, unit, context.Compilation, (n, r) => script.Replace(n, AddParensIfRequired (n, initializer.Initializer.Clone())), default(CancellationToken));
script.Remove(node);
}, initializer);
}
public static bool RequiresParens(AstNode replaceNode, AstNode replaceWithNode)
{
if (!(replaceWithNode is BinaryOperatorExpression) &&
!(replaceWithNode is AsExpression) &&
!(replaceWithNode is IsExpression) &&
!(replaceWithNode is ConditionalExpression)) {
return false;
}
var cond = replaceNode.Parent as ConditionalExpression;
if (cond != null && cond.Condition == replaceNode)
return true;
var indexer = replaceNode.Parent as IndexerExpression;
if (indexer != null && indexer.Target == replaceNode)
return true;
return replaceNode.Parent is BinaryOperatorExpression ||
replaceNode.Parent is UnaryOperatorExpression ||
replaceNode.Parent is MemberReferenceExpression ||
replaceNode.Parent is AsExpression ||
replaceNode.Parent is IsExpression ||
replaceNode.Parent is CastExpression ||
replaceNode.Parent is PointerReferenceExpression;
}
static Expression AddParensIfRequired(AstNode replaceNode, Expression expression)
{
if (RequiresParens(replaceNode, expression))
return new ParenthesizedExpression(expression);
return expression;
}
}
}
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