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// Copyright (c) 2013 Daniel Grunwald
//
// 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.CSharp.Resolver;
using ICSharpCode.NRefactory.Semantics;
using ICSharpCode.NRefactory.TypeSystem;
namespace ICSharpCode.NRefactory.CSharp.Refactoring
{
/// <summary>
/// 1) When a type cannot be resolved, offers to add a using declaration
/// or to replace it with the fully qualified type name.
/// 2) When an extension method cannot be resolved, offers to add a using declaration.
/// 3) When the caret is on a namespace name, offers to add a using declaration
/// and simplify the type references to use the new shorter option.
/// </summary>
[ContextAction ("Add using", Description = "Add missing using declaration.")]
public class AddUsingAction : ICodeActionProvider
{
public IEnumerable<CodeAction> GetActions(RefactoringContext context)
{
AstNode node = context.GetNode();
if (node is Identifier)
node = node.Parent;
if (node is SimpleType || node is IdentifierExpression) {
return GetActionsForType(context, node)
.Concat(GetActionsForAddNamespaceUsing(context, node));
} else if (node is MemberReferenceExpression && node.Parent is InvocationExpression) {
return GetActionsForExtensionMethodInvocation(context, (InvocationExpression)node.Parent);
} else if (node is MemberReferenceExpression) {
return GetActionsForAddNamespaceUsing(context, node);
} else {
return EmptyList<CodeAction>.Instance;
}
}
IEnumerable<CodeAction> GetActionsForType(RefactoringContext context, AstNode node)
{
var rr = context.Resolve(node) as UnknownIdentifierResolveResult;
if (rr == null)
return EmptyList<CodeAction>.Instance;
string identifier = rr.Identifier;
int tc = rr.TypeArgumentCount;
string attributeIdentifier = null;
if (node.Parent is Attribute)
attributeIdentifier = identifier + "Attribute";
var lookup = new MemberLookup(null, context.Compilation.MainAssembly);
List<CodeAction> actions = new List<CodeAction>();
foreach (var typeDefinition in context.Compilation.GetAllTypeDefinitions()) {
if ((typeDefinition.Name == identifier || typeDefinition.Name == attributeIdentifier)
&& typeDefinition.TypeParameterCount == tc
&& lookup.IsAccessible(typeDefinition, false))
{
if (typeDefinition.DeclaringTypeDefinition == null) {
actions.Add(NewUsingAction(context, node, typeDefinition.Namespace));
}
actions.Add(ReplaceWithFullTypeNameAction(context, node, typeDefinition));
}
}
return actions;
}
CodeAction NewUsingAction(RefactoringContext context, AstNode node, string ns)
{
return new CodeAction("using " + ns + ";", s => UsingHelper.InsertUsingAndRemoveRedundantNamespaceUsage(context, s, ns), node);
}
CodeAction ReplaceWithFullTypeNameAction(RefactoringContext context, AstNode node, ITypeDefinition typeDefinition)
{
AstType astType = context.CreateShortType(typeDefinition);
string textWithoutGenerics = astType.ToString();
foreach (var typeArg in node.GetChildrenByRole(Roles.TypeArgument)) {
astType.AddChild(typeArg.Clone(), Roles.TypeArgument);
}
return new CodeAction(textWithoutGenerics, s => s.Replace(node, astType), node);
}
IEnumerable<CodeAction> GetActionsForExtensionMethodInvocation(RefactoringContext context, InvocationExpression invocation)
{
var rr = context.Resolve(invocation) as UnknownMethodResolveResult;
if (rr == null)
return EmptyList<CodeAction>.Instance;
var lookup = new MemberLookup(null, context.Compilation.MainAssembly);
HashSet<string> namespaces = new HashSet<string>();
List<CodeAction> result = new List<CodeAction>();
foreach (var typeDefinition in context.Compilation.GetAllTypeDefinitions()) {
if (!(typeDefinition.HasExtensionMethods && lookup.IsAccessible(typeDefinition, false))) {
continue;
}
foreach (var method in typeDefinition.Methods.Where(m => m.IsExtensionMethod && m.Name == rr.MemberName)) {
IType[] inferredTypes;
if (CSharpResolver.IsEligibleExtensionMethod(rr.TargetType, method, true, out inferredTypes)) {
// avoid offering the same namespace twice
if (namespaces.Add(typeDefinition.Namespace)) {
result.Add(NewUsingAction(context, invocation, typeDefinition.Namespace));
}
break; // continue with the next type
}
}
}
return result;
}
IEnumerable<CodeAction> GetActionsForAddNamespaceUsing(RefactoringContext context, AstNode node)
{
var nrr = context.Resolve(node) as NamespaceResolveResult;
if (nrr == null)
return EmptyList<CodeAction>.Instance;
var trr = context.Resolve(node.Parent) as TypeResolveResult;
if (trr == null)
return EmptyList<CodeAction>.Instance;
ITypeDefinition typeDef = trr.Type.GetDefinition();
if (typeDef == null)
return EmptyList<CodeAction>.Instance;
IList<IType> typeArguments;
ParameterizedType parameterizedType = trr.Type as ParameterizedType;
if (parameterizedType != null)
typeArguments = parameterizedType.TypeArguments;
else
typeArguments = EmptyList<IType>.Instance;
var resolver = context.GetResolverStateBefore(node.Parent);
if (resolver.ResolveSimpleName(typeDef.Name, typeArguments) is UnknownIdentifierResolveResult) {
// It's possible to remove the explicit namespace usage and introduce a using instead
return new[] { NewUsingAction(context, node, typeDef.Namespace) };
}
return EmptyList<CodeAction>.Instance;
}
}
}
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