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Diffstat (limited to 'main/src/addins/CSharpBinding/MonoDevelop.CSharp.Completion/ProtocolMemberContextHandler.cs')
| -rw-r--r-- | main/src/addins/CSharpBinding/MonoDevelop.CSharp.Completion/ProtocolMemberContextHandler.cs | 153 |
1 files changed, 153 insertions, 0 deletions
diff --git a/main/src/addins/CSharpBinding/MonoDevelop.CSharp.Completion/ProtocolMemberContextHandler.cs b/main/src/addins/CSharpBinding/MonoDevelop.CSharp.Completion/ProtocolMemberContextHandler.cs new file mode 100644 index 0000000000..5aa77d4301 --- /dev/null +++ b/main/src/addins/CSharpBinding/MonoDevelop.CSharp.Completion/ProtocolMemberContextHandler.cs @@ -0,0 +1,153 @@ +// +// 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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