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//
// ExtractFieldAction.cs
//
// Author:
// Nieve <>
//
// Copyright (c) 2012 Nieve
//
// 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;
using ICSharpCode.NRefactory.PatternMatching;
using Mono.CSharp;
using ICSharpCode.NRefactory.TypeSystem;
namespace ICSharpCode.NRefactory.CSharp.Refactoring
{
[ContextAction("Extract field", Description = "Extracts a field from a local variable declaration.")]
public class ExtractFieldAction : ICodeActionProvider
{
static readonly AstType varType = new SimpleType ("var");
public IEnumerable<CodeAction> GetActions(RefactoringContext context)
{
//TODO: implement variable assignment & ctor param
var varInit = context.GetNode<VariableInitializer>();
if (varInit != null) {
AstType type = varInit.GetPrevNode() as AstType;
if (type == null) yield break;
if (varInit.Parent is FieldDeclaration) yield break;
if (CannotExtractField(context, varInit)) yield break;
yield return new CodeAction(context.TranslateString("Assign to new field"), s=>{
var name = varInit.Name;
AstType extractedType;
if (type.IsMatch (varType)) {
IType resolvedType = context.Resolve(varInit.Initializer).Type;
extractedType = context.CreateShortType(resolvedType);
}
else {
extractedType = (AstType) type.Clone();
}
AstNode entityDeclarationNode = varInit.Parent;
while (!(entityDeclarationNode is EntityDeclaration) || (entityDeclarationNode is Accessor)) {
entityDeclarationNode = entityDeclarationNode.Parent;
}
var entity = (EntityDeclaration) entityDeclarationNode;
bool isStatic = entity.HasModifier(Modifiers.Static);
FieldDeclaration field = new FieldDeclaration(){
Modifiers = isStatic ? Modifiers.Static : Modifiers.None,
ReturnType = extractedType,
Variables = { new VariableInitializer(name) }
};
AstNode nodeToRemove = RemoveDeclaration(varInit) ? varInit.Parent : type;
s.Remove(nodeToRemove, true);
s.InsertWithCursor(context.TranslateString("Insert new field"),Script.InsertPosition.Before,field);
s.FormatText(varInit.Parent);
}, varInit);
}
var idntf = context.GetNode<Identifier>();
if (idntf == null) yield break;
var paramDec = idntf.Parent as ParameterDeclaration;
if (paramDec != null) {
var ctor = paramDec.Parent as ConstructorDeclaration;
if (ctor == null) yield break;
MemberReferenceExpression thisField = new MemberReferenceExpression(new ThisReferenceExpression(), idntf.Name, new AstType[]{});
var assign = new AssignmentExpression(thisField, AssignmentOperatorType.Assign, new IdentifierExpression(idntf.Name));
var statement = new ExpressionStatement(assign);
var type = (idntf.GetPrevNode() as AstType).Clone();
FieldDeclaration field = new FieldDeclaration(){
ReturnType = type.Clone(),
Variables = { new VariableInitializer(idntf.Name) }
};
yield return new CodeAction(context.TranslateString("Assign to new field"), s=>{
s.InsertWithCursor(context.TranslateString("Insert new field"),Script.InsertPosition.Before,field);
s.AddTo(ctor.Body, statement);
}, paramDec);
}
}
static bool RemoveDeclaration (VariableInitializer varInit){
var result = varInit.Parent as VariableDeclarationStatement;
return result.Variables.First ().Initializer.IsNull;
}
static bool CannotExtractField (RefactoringContext context, VariableInitializer varInit)
{
var result = varInit.Parent as VariableDeclarationStatement;
return result == null || result.Variables.Count != 1 || ContainsAnonymousType(context.Resolve(varInit.Initializer).Type);
}
static bool ContainsAnonymousType (IType type)
{
if (type.Kind == TypeKind.Anonymous)
return true;
var arrayType = type as ArrayType;
return arrayType != null && ContainsAnonymousType (arrayType.ElementType);
}
}
}
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