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//
// MergeNestedIfAction.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.Linq;
namespace ICSharpCode.NRefactory.CSharp.Refactoring
{
[ContextAction ("Merge nested 'if'", Description = "Merge two nested 'if' statements.")]
public class MergeNestedIfAction : SpecializedCodeAction<IfElseStatement>
{
static readonly InsertParenthesesVisitor insertParenthesesVisitor = new InsertParenthesesVisitor ();
protected override CodeAction GetAction (RefactoringContext context, IfElseStatement node)
{
if (!node.IfToken.Contains (context.Location))
return null;
IfElseStatement outerIfStatement;
IfElseStatement innerIfStatement = GetInnerIfStatement (node);
if (innerIfStatement != null) {
if (!innerIfStatement.FalseStatement.IsNull)
return null;
outerIfStatement = node;
} else {
outerIfStatement = GetOuterIfStatement (node);
if (outerIfStatement == null || !outerIfStatement.FalseStatement.IsNull)
return null;
innerIfStatement = node;
}
return new CodeAction (context.TranslateString ("Merge nested 'if's"),
script =>
{
var mergedIfStatement = new IfElseStatement
{
Condition = new BinaryOperatorExpression (outerIfStatement.Condition.Clone (),
BinaryOperatorType.ConditionalAnd,
innerIfStatement.Condition.Clone ()),
TrueStatement = innerIfStatement.TrueStatement.Clone ()
};
mergedIfStatement.Condition.AcceptVisitor (insertParenthesesVisitor);
script.Replace (outerIfStatement, mergedIfStatement);
}, node);
}
static IfElseStatement GetOuterIfStatement (IfElseStatement node)
{
var outerIf = node.Parent as IfElseStatement;
if (outerIf != null)
return outerIf;
var blockStatement = node.Parent as BlockStatement;
while (blockStatement != null && blockStatement.Statements.Count == 1) {
outerIf = blockStatement.Parent as IfElseStatement;
if (outerIf != null)
return outerIf;
blockStatement = blockStatement.Parent as BlockStatement;
}
return null;
}
static IfElseStatement GetInnerIfStatement (IfElseStatement node)
{
if (!node.FalseStatement.IsNull)
return null;
var innerIf = node.TrueStatement as IfElseStatement;
if (innerIf != null)
return innerIf;
var blockStatement = node.TrueStatement as BlockStatement;
while (blockStatement != null && blockStatement.Statements.Count == 1) {
innerIf = blockStatement.Statements.First () as IfElseStatement;
if (innerIf != null)
return innerIf;
blockStatement = blockStatement.Statements.First () as BlockStatement;
}
return null;
}
}
}
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