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//
// ProtocolMemberContextHandler.cs
//
// Author:
// Mike Krüger <mkrueger@xamarin.com>
//
// Copyright (c) 2015 Xamarin Inc. (http://xamarin.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 ICSharpCode.NRefactory6.CSharp.Completion;
using System.Collections.Generic;
using ICSharpCode.NRefactory6.CSharp;
using Microsoft.CodeAnalysis;
using System.Threading;
using System.Linq;
using Mono.Addins.Description;
namespace MonoDevelop.CSharp.Completion
{
class ProtocolMemberContextHandler : OverrideContextHandler
{
CSharpCompletionTextEditorExtension extension;
public ProtocolMemberContextHandler (CSharpCompletionTextEditorExtension extension)
{
this.extension = extension;
}
protected override IEnumerable<ICompletionData> CreateCompletionData (CompletionEngine engine, SemanticModel semanticModel, int position, ITypeSymbol returnType, Accessibility seenAccessibility, SyntaxToken startToken, SyntaxToken tokenBeforeReturnType, bool afterKeyword, CancellationToken cancellationToken)
{
var result = new List<ICompletionData> ();
ISet<ISymbol> overridableMembers;
if (!TryDetermineOverridableMembers (semanticModel, tokenBeforeReturnType, seenAccessibility, out overridableMembers, cancellationToken)) {
return result;
}
if (returnType != null) {
overridableMembers = FilterOverrides (overridableMembers, returnType);
}
var curType = semanticModel.GetEnclosingSymbol<INamedTypeSymbol> (startToken.SpanStart, cancellationToken);
var declarationBegin = afterKeyword ? startToken.SpanStart : position;
foreach (var m in overridableMembers) {
var data = new ProtocolCompletionData (this, extension, declarationBegin, curType, m, afterKeyword);
result.Add (data);
}
return result;
}
static bool TryDetermineOverridableMembers(SemanticModel semanticModel, SyntaxToken startToken, Accessibility seenAccessibility, out ISet<ISymbol> overridableMembers, CancellationToken cancellationToken)
{
var result = new HashSet<ISymbol>();
var containingType = semanticModel.GetEnclosingSymbol<INamedTypeSymbol>(startToken.SpanStart, cancellationToken);
if (containingType != null && !containingType.IsScriptClass && !containingType.IsImplicitClass)
{
if (containingType.TypeKind == TypeKind.Class || containingType.TypeKind == TypeKind.Struct)
{
var baseTypes = containingType.GetBaseTypes().Reverse();
foreach (var type in baseTypes)
{
cancellationToken.ThrowIfCancellationRequested();
// Prefer overrides in derived classes
RemoveOverriddenMembers(result, type, cancellationToken);
// Retain overridable methods
AddProtocolMembers(semanticModel, result, containingType, type, cancellationToken);
}
// Don't suggest already overridden members
RemoveOverriddenMembers(result, containingType, cancellationToken);
}
}
// Filter based on accessibility
if (seenAccessibility != Accessibility.NotApplicable)
{
result.RemoveWhere(m => m.DeclaredAccessibility != seenAccessibility);
}
overridableMembers = result;
return overridableMembers.Count > 0;
}
static void AddProtocolMembers(SemanticModel semanticModel, HashSet<ISymbol> result, INamedTypeSymbol containingType, INamedTypeSymbol type, CancellationToken cancellationToken)
{
string name;
if (!HasProtocolAttribute (containingType, out name))
return;
var protocolType = semanticModel.Compilation.GetTypeByMetadataName (name);
if (protocolType == null)
return;
foreach (var member in protocolType.GetMembers ().OfType<IMethodSymbol> ()) {
if (member.ExplicitInterfaceImplementations.Length > 0 || member.IsAbstract || !member.IsVirtual)
continue;
if (member.GetAttributes ().Any (a => a.AttributeClass.Name == "ExportAttribute" && IsFoundationNamespace (a.AttributeClass.ContainingNamespace.GetFullName ()))) {
result.Add (member);
}
}
foreach (var member in protocolType.GetMembers ().OfType<IPropertySymbol> ()) {
if (member.ExplicitInterfaceImplementations.Length > 0 || member.IsAbstract || !member.IsVirtual)
continue;
if (member.GetMethod != null && member.GetMethod.GetAttributes ().Any (a => a.AttributeClass.Name == "ExportAttribute" && IsFoundationNamespace (a.AttributeClass.ContainingNamespace.GetFullName ())) ||
member.SetMethod != null && member.SetMethod.GetAttributes ().Any (a => a.AttributeClass.Name == "ExportAttribute" && IsFoundationNamespace (a.AttributeClass.ContainingNamespace.GetFullName ())))
result.Add (member);
}
}
internal static bool IsFoundationNamespace (string ns )
{
return (ns == "MonoTouch.Foundation" || ns == "Foundation");
}
internal static bool IsFoundationNamespace (INamespaceSymbol ns)
{
return IsFoundationNamespace (ns.GetFullName ());
}
internal static bool HasProtocolAttribute (INamedTypeSymbol type, out string name)
{
foreach (var attrs in type.GetAttributes ()) {
if (attrs.AttributeClass.Name == "ProtocolAttribute" && IsFoundationNamespace (attrs.AttributeClass.ContainingNamespace.GetFullName ())) {
foreach (var na in attrs.NamedArguments) {
if (na.Key != "Name")
continue;
name = na.Value.Value as string;
if (name != null)
return true;
}
}
}
name = null;
return false;
}
}
}
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