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//
// ConvertConditionalToIfAction.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.Collections.Generic;
using System.Linq;
namespace ICSharpCode.NRefactory.CSharp.Refactoring
{
[ContextAction ("Convert '?:' to 'if'", Description = "Convert '?:' operator to 'if' statement.")]
public class ConvertConditionalToIfAction : ICodeActionProvider
{
public IEnumerable<CodeAction> GetActions (RefactoringContext context)
{
// return
var returnStatement = context.GetNode<ReturnStatement> ();
if (returnStatement != null) {
var action = GetAction (context, returnStatement, returnStatement.Expression,
expr => new Statement[]
{
new IfElseStatement (expr.Condition.Clone (),
new ReturnStatement (expr.TrueExpression.Clone ()),
new ReturnStatement (expr.FalseExpression.Clone ()))
});
if (action != null)
yield return action;
yield break;
}
// assignment
var assignment = context.GetNode<AssignmentExpression> ();
if (assignment != null) {
var statement = assignment.Parent as ExpressionStatement;
if (statement == null)
yield break;
// statement is in for initializer/iterator
if (statement.Parent is ForStatement &&
statement != ((ForStatement)statement.Parent).EmbeddedStatement)
yield break;
// statement is in using resource-acquisition
if (statement.Parent is UsingStatement &&
statement != ((UsingStatement)statement.Parent).EmbeddedStatement)
yield break;
var action = GetAction (context, statement, assignment.Right,
expr => new Statement [] { ConvertAssignment (assignment.Left, assignment.Operator, expr) });
if (action != null)
yield return action;
yield break;
}
// variable initializer
var initializer = context.GetNode<VariableInitializer> ();
if (initializer != null && initializer.Parent is VariableDeclarationStatement &&
initializer.Parent.Parent is BlockStatement) {
var variableDecl = (VariableDeclarationStatement)initializer.Parent;
var newVariableDecl = (VariableDeclarationStatement)variableDecl.Clone ();
foreach (var variable in newVariableDecl.Variables) {
if (variable.Name == initializer.Name)
variable.Initializer = Expression.Null;
}
var action = GetAction (context, variableDecl, initializer.Initializer,
expr => new Statement []
{
newVariableDecl,
ConvertAssignment (new IdentifierExpression (initializer.Name), AssignmentOperatorType.Assign,
expr)
});
if (action != null)
yield return action;
}
}
CodeAction GetAction (RefactoringContext context, Statement originalStatement, Expression conditionalCandidate,
Func<ConditionalExpression, IEnumerable<Statement>> getReplacement)
{
var conditionalExpr = GetConditionalExpression (conditionalCandidate);
if (conditionalExpr == null ||
!(conditionalExpr.QuestionMarkToken.Contains(context.Location) ||
conditionalExpr.ColonToken.Contains(context.Location)))
return null;
return new CodeAction (context.TranslateString ("Convert '?:' to 'if'"),
script =>
{
foreach (var node in getReplacement (conditionalExpr))
script.InsertBefore (originalStatement, node);
script.Remove (originalStatement);
}, conditionalExpr);
}
static ConditionalExpression GetConditionalExpression (Expression expr)
{
while (expr != null) {
if (expr is ConditionalExpression)
return (ConditionalExpression)expr;
var parenthesizedExpr = expr as ParenthesizedExpression;
if (parenthesizedExpr == null)
break;
expr = parenthesizedExpr.Expression;
}
return null;
}
static IfElseStatement ConvertAssignment (Expression target, AssignmentOperatorType op,
ConditionalExpression conditionalExpr)
{
var trueAssignment = new AssignmentExpression (target.Clone (), op,
conditionalExpr.TrueExpression.Clone ());
var falseAssignment = new AssignmentExpression (target.Clone (), op,
conditionalExpr.FalseExpression.Clone ());
return new IfElseStatement (conditionalExpr.Condition.Clone (),
new ExpressionStatement (trueAssignment),
new ExpressionStatement (falseAssignment));
}
}
}
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