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//
// SplitDeclarationAndAssignment.cs
//
// Author:
// Mike Krüger <mkrueger@novell.com>
//
// Copyright (c) 2011 Mike Krüger <mkrueger@novell.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;
using System.Linq;
using ICSharpCode.NRefactory.PatternMatching;
using System.Threading;
using System.Collections.Generic;
using ICSharpCode.NRefactory.TypeSystem;
namespace ICSharpCode.NRefactory.CSharp.Refactoring
{
[ContextAction("Split local variable declaration and assignment", Description = "Splits local variable declaration and assignment.")]
public class SplitDeclarationAndAssignmentAction : ICodeActionProvider
{
public IEnumerable<CodeAction> GetActions(RefactoringContext context)
{
if (context.IsSomethingSelected) {
yield break;
}
AstType type;
var varDecl = GetVariableDeclarationStatement(context, out type);
if (varDecl == null) {
yield break;
}
yield return new CodeAction(context.TranslateString("Split local variable declaration and assignment"), script => {
var assign = new AssignmentExpression (new IdentifierExpression (varDecl.Variables.First().Name), AssignmentOperatorType.Assign, varDecl.Variables.First().Initializer.Clone());
var newVarDecl = (VariableDeclarationStatement)varDecl.Clone();
newVarDecl.Role = BlockStatement.StatementRole;
if (newVarDecl.Type.IsVar()) {
newVarDecl.Type = type;
}
newVarDecl.Variables.First().Initializer = Expression.Null;
script.InsertBefore(varDecl, newVarDecl);
script.Replace(varDecl, varDecl.Parent is ForStatement ? (AstNode)assign : new ExpressionStatement (assign));
}, varDecl.Variables.First ().AssignToken);
}
static VariableDeclarationStatement GetVariableDeclarationStatement (RefactoringContext context, out AstType resolvedType, CancellationToken cancellationToken = default(CancellationToken))
{
var result = context.GetNode<VariableDeclarationStatement> ();
if (result != null && result.Variables.Count == 1 && !result.Variables.First ().Initializer.IsNull && result.Variables.First ().NameToken.Contains (context.Location.Line, context.Location.Column)) {
var type = context.Resolve(result.Variables.First ().Initializer).Type;
if (type.Equals(SpecialType.NullType) || type.Equals(SpecialType.UnknownType)) {
resolvedType = new PrimitiveType ("object");
} else {
resolvedType = context.CreateShortType (type);
}
return result;
}
resolvedType = null;
return null;
}
}
}
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