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//
// ConvertIfToConditionalAction.cs
//
// Author:
// Mansheng Yang <lightyang0@gmail.com>
//
// Copyright (c) 2012 Mansheng Yang <lightyang0@gmail.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;
namespace ICSharpCode.NRefactory.CSharp.Refactoring
{
[ContextAction ("Convert 'if' to '?:'", Description = "Convert 'if' statement to '?:' operator.")]
public class ConvertIfToConditionalAction : SpecializedCodeAction <IfElseStatement>
{
static readonly InsertParenthesesVisitor insertParenthesesVisitor = new InsertParenthesesVisitor ();
protected override CodeAction GetAction (RefactoringContext context, IfElseStatement ifElseStatement)
{
if (!ifElseStatement.IfToken.Contains (context.Location))
return null;
var convertAssignment = GetConvertAssignmentAction (context, ifElseStatement);
if (convertAssignment != null)
return convertAssignment;
var convertReturn = GetConvertReturnAction (context, ifElseStatement);
return convertReturn;
}
CodeAction GetConvertAssignmentAction (RefactoringContext context, IfElseStatement ifElseStatement)
{
Func<Statement, AssignmentExpression> extractAssignment =
node =>
{
var exprStatement = node as ExpressionStatement;
if (exprStatement != null)
return exprStatement.Expression as AssignmentExpression;
return null;
};
return GetAction (context, ifElseStatement, extractAssignment,
(assignment1, assignment2) =>
{
if (assignment1.Operator != assignment2.Operator || !assignment1.Left.Match (assignment2.Left).Success)
return null;
var conditionalExpr = new ConditionalExpression (ifElseStatement.Condition.Clone (),
assignment1.Right.Clone (),
assignment2.Right.Clone ());
conditionalExpr.AcceptVisitor (insertParenthesesVisitor);
var assignment = new AssignmentExpression (assignment1.Left.Clone (), assignment1.Operator,
conditionalExpr);
return new ExpressionStatement (assignment);
});
}
CodeAction GetConvertReturnAction (RefactoringContext context, IfElseStatement ifElseStatement)
{
Func<Statement, ReturnStatement> extractReturn = node => node as ReturnStatement;
return GetAction (context, ifElseStatement, extractReturn,
(return1, return2) =>
{
var conditionalExpr = new ConditionalExpression (ifElseStatement.Condition.Clone (),
return1.Expression.Clone (),
return2.Expression.Clone ());
conditionalExpr.AcceptVisitor (insertParenthesesVisitor);
return new ReturnStatement (conditionalExpr);
},
true);
}
CodeAction GetAction<T> (RefactoringContext context, IfElseStatement ifElseStatement,
Func<Statement, T> extractor, Func<T, T, Statement> getReplaceStatement,
bool findImplicitFalseStatement = false)
where T : AstNode
{
var node1 = GetNode (ifElseStatement.TrueStatement, extractor);
if (node1 == null)
return null;
var falseStatement = ifElseStatement.FalseStatement;
// try next statement if there is no FalseStatement
if (falseStatement.IsNull && findImplicitFalseStatement)
falseStatement = ifElseStatement.GetNextSibling (n => n is Statement) as Statement;
var node2 = GetNode (falseStatement, extractor);
if (node2 == null)
return null;
var replacement = getReplaceStatement (node1, node2);
if (replacement == null)
return null;
return new CodeAction (context.TranslateString ("Convert 'if' to '?:'"),
script =>
{
script.Replace (ifElseStatement, replacement);
// remove implicit false statement
if (falseStatement != ifElseStatement.FalseStatement)
script.Remove (falseStatement);
},
ifElseStatement
);
}
static T GetNode<T> (Statement node, Func<Statement, T> extract)
where T : AstNode
{
var result = extract (node);
if (result != null)
return result;
var blockStatement = node as BlockStatement;
if (blockStatement != null && blockStatement.Statements.Count == 1)
return GetNode (blockStatement.Statements.First (), extract);
return null;
}
}
}
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