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// Copyright (c) Microsoft. All Rights Reserved. Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information.
//
// DebuggerExpressionResolver.cs
//
// Author:
// David Karlaš <david.karlas@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 Microsoft.CodeAnalysis;
using Microsoft.CodeAnalysis.Text;
using Microsoft.CodeAnalysis.CSharp;
using System.Linq;
using System.Threading;
using System.Threading.Tasks;
using ICSharpCode.NRefactory6.CSharp;
using Microsoft.CodeAnalysis.CSharp.Syntax;
using MonoDevelop.Ide.Editor;
using MonoDevelop.Debugger;
namespace MonoDevelop.CSharp.Resolver
{
public static class DebuggerExpressionResolver
{
public static async Task<DebugDataTipInfo> ResolveAsync (IReadonlyTextDocument editor, DocumentContext document, int offset, CancellationToken cancellationToken)
{
var analysisDocument = document.AnalysisDocument;
DebugDataTipInfo result;
CompilationUnitSyntax compilationUnit = null;
if (analysisDocument == null) {
compilationUnit = SyntaxFactory.ParseCompilationUnit (editor.Text);
result = GetInfo (compilationUnit, null, offset, default(CancellationToken));
} else {
compilationUnit = await analysisDocument.GetCSharpSyntaxRootAsync (cancellationToken).ConfigureAwait (false);
var semantic = document.ParsedDocument?.GetAst<SemanticModel> ();
if (semantic == null) {
semantic = await analysisDocument.GetSemanticModelAsync (cancellationToken).ConfigureAwait (false);
}
result = GetInfo (compilationUnit, semantic, offset, default(CancellationToken));
}
if (result.IsDefault || !result.Span.Contains(offset)) {
return new DebugDataTipInfo (result.Span, null);
} else if (result.Text == null) {
return new DebugDataTipInfo (result.Span, compilationUnit.GetText ().ToString (result.Span));
} else {
return result;
}
}
static DebugDataTipInfo GetInfo (CompilationUnitSyntax root, SemanticModel semanticModel, int position, CancellationToken cancellationToken)
{
var token = root.FindToken (position);
string textOpt = null;
var expression = token.Parent as ExpressionSyntax;
if (expression == null) {
if (Microsoft.CodeAnalysis.CSharpExtensions.IsKind (token, SyntaxKind.IdentifierToken)) {
if (token.Parent is MethodDeclarationSyntax) {
return default(DebugDataTipInfo);
}
if (semanticModel != null) {
if (token.Parent is PropertyDeclarationSyntax) {
var propertySymbol = semanticModel.GetDeclaredSymbol ((PropertyDeclarationSyntax)token.Parent);
if (propertySymbol.IsStatic) {
textOpt = propertySymbol.ContainingType.GetFullName () + "." + propertySymbol.Name;
}
} else if (token.GetAncestor<FieldDeclarationSyntax> () != null) {
var fieldSymbol = semanticModel.GetDeclaredSymbol (token.GetAncestor<VariableDeclaratorSyntax> ());
if (fieldSymbol.IsStatic) {
textOpt = fieldSymbol.ContainingType.GetFullName () + "." + fieldSymbol.Name;
}
}
}
return new DebugDataTipInfo (token.Span, text: textOpt);
} else {
return default(DebugDataTipInfo);
}
}
if (expression.IsAnyLiteralExpression ()) {
// If the user hovers over a literal, give them a DataTip for the type of the
// literal they're hovering over.
// Partial semantics should always be sufficient because the (unconverted) type
// of a literal can always easily be determined.
var type = semanticModel?.GetTypeInfo (expression, cancellationToken).Type;
return type == null
? default(DebugDataTipInfo)
: new DebugDataTipInfo (expression.Span, type.GetFullName ());
}
// Check if we are invoking method and if we do return null so we don't invoke it
if (expression.Parent is InvocationExpressionSyntax ||
(semanticModel != null &&
expression.Parent is MemberAccessExpressionSyntax &&
expression.Parent.Parent is InvocationExpressionSyntax &&
semanticModel.GetSymbolInfo (token).Symbol is IMethodSymbol))
{
return default(DebugDataTipInfo);
}
if (expression.IsRightSideOfDotOrArrow ()) {
var curr = expression;
while (true) {
var conditionalAccess = curr.GetParentConditionalAccessExpression ();
if (conditionalAccess == null) {
break;
}
curr = conditionalAccess;
}
if (curr == expression) {
// NB: Parent.Span, not Span as below.
return new DebugDataTipInfo (expression.Parent.Span, text: null);
}
// NOTE: There may not be an ExpressionSyntax corresponding to the range we want.
// For example, for input a?.$$B?.C, we want span [|a?.B|]?.C.
return new DebugDataTipInfo (TextSpan.FromBounds (curr.SpanStart, expression.Span.End), text: null);
}
var typeSyntax = expression as TypeSyntax;
if (typeSyntax != null && typeSyntax.IsVar) {
// If the user is hovering over 'var', then pass back the full type name that 'var'
// binds to.
var type = semanticModel?.GetTypeInfo (typeSyntax, cancellationToken).Type;
if (type != null) {
textOpt = type.GetFullName ();
}
}
if (semanticModel != null) {
if (expression is IdentifierNameSyntax) {
if (expression.Parent is ObjectCreationExpressionSyntax) {
textOpt = ((INamedTypeSymbol)semanticModel.GetSymbolInfo (expression).Symbol).GetFullName ();
} else if (expression.Parent is AssignmentExpressionSyntax && expression.Parent.Parent is InitializerExpressionSyntax) {
var variable = expression.GetAncestor<VariableDeclaratorSyntax> ();
if (variable != null) {
textOpt = variable.Identifier.Text + "." + ((IdentifierNameSyntax)expression).Identifier.Text;
}
}
}
}
return new DebugDataTipInfo (expression.Span, textOpt);
}
}
}
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