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//
// CreateEventInvocator.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 System.Collections.Generic;
using ICSharpCode.NRefactory.TypeSystem;
namespace ICSharpCode.NRefactory.CSharp.Refactoring
{
[ContextAction("Create event invocator", Description = "Creates a standard OnXXX event method.")]
public class CreateEventInvocatorAction : ICodeActionProvider
{
/// <summary>
/// If <c>true</c> an explicit type will be used for the handler variable; otherwise, 'var' will be used as type.
/// Default value is <c>false</c>
/// </summary>
public bool UseExplictType {
get;
set;
}
public static MethodDeclaration CreateEventInvocator (RefactoringContext context, TypeDeclaration declaringType, EventDeclaration eventDeclaration, VariableInitializer initializer, IMethod invokeMethod, bool useExplictType)
{
bool hasSenderParam = false;
IEnumerable<IParameter> pars = invokeMethod.Parameters;
if (invokeMethod.Parameters.Any()) {
var first = invokeMethod.Parameters [0];
if (first.Name == "sender" /*&& first.Type == "System.Object"*/) {
hasSenderParam = true;
pars = invokeMethod.Parameters.Skip(1);
}
}
const string handlerName = "handler";
var arguments = new List<Expression>();
if (hasSenderParam)
arguments.Add(eventDeclaration.HasModifier (Modifiers.Static) ? (Expression)new PrimitiveExpression (null) : new ThisReferenceExpression());
bool useThisMemberReference = false;
foreach (var par in pars) {
arguments.Add(new IdentifierExpression(par.Name));
useThisMemberReference |= par.Name == initializer.Name;
}
var proposedHandlerName = GetNameProposal(initializer);
var modifiers = eventDeclaration.HasModifier(Modifiers.Static) ? Modifiers.Static : Modifiers.Protected | Modifiers.Virtual;
if (declaringType.HasModifier (Modifiers.Sealed)) {
modifiers = Modifiers.None;
}
var methodDeclaration = new MethodDeclaration {
Name = proposedHandlerName,
ReturnType = new PrimitiveType ("void"),
Modifiers = modifiers,
Body = new BlockStatement {
new VariableDeclarationStatement (
useExplictType ? eventDeclaration.ReturnType.Clone () : new PrimitiveType ("var"), handlerName,
useThisMemberReference ?
(Expression)new MemberReferenceExpression (new ThisReferenceExpression (), initializer.Name)
: new IdentifierExpression (initializer.Name)
),
new IfElseStatement {
Condition = new BinaryOperatorExpression (new IdentifierExpression (handlerName), BinaryOperatorType.InEquality, new PrimitiveExpression (null)),
TrueStatement = new ExpressionStatement (new InvocationExpression (new IdentifierExpression (handlerName), arguments))
}
}
};
foreach (var par in pars) {
var typeName = context.CreateShortType(par.Type);
var decl = new ParameterDeclaration(typeName, par.Name);
methodDeclaration.Parameters.Add(decl);
}
return methodDeclaration;
}
static string GetNameProposal(VariableInitializer initializer)
{
return "On" + char.ToUpper(initializer.Name[0]) + initializer.Name.Substring(1);
}
public IEnumerable<CodeAction> GetActions(RefactoringContext context)
{
VariableInitializer initializer;
var eventDeclaration = GetEventDeclaration(context, out initializer);
if (eventDeclaration == null) {
yield break;
}
var type = (TypeDeclaration)eventDeclaration.Parent;
var proposedHandlerName = GetNameProposal(initializer);
if (type.Members.Any(m => m is MethodDeclaration && m.Name == proposedHandlerName)) {
yield break;
}
var resolvedType = context.Resolve(eventDeclaration.ReturnType).Type;
if (resolvedType.Kind == TypeKind.Unknown) {
yield break;
}
var invokeMethod = resolvedType.GetDelegateInvokeMethod();
if (invokeMethod == null) {
yield break;
}
yield return new CodeAction(context.TranslateString("Create event invocator"), script => {
var methodDeclaration = CreateEventInvocator (context, type, eventDeclaration, initializer, invokeMethod, UseExplictType);
script.InsertWithCursor(
context.TranslateString("Create event invocator"),
Script.InsertPosition.After,
methodDeclaration
);
}, initializer);
}
static EventDeclaration GetEventDeclaration (RefactoringContext context, out VariableInitializer initializer)
{
var result = context.GetNode<EventDeclaration> ();
if (result == null) {
initializer = null;
return null;
}
initializer = result.Variables.FirstOrDefault (v => v.NameToken.Contains (context.Location));
return initializer != null ? result : null;
}
}
}
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