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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.
using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading;
using System.Threading.Tasks;
using Microsoft.CodeAnalysis.Formatting;
using Microsoft.CodeAnalysis.Formatting.Rules;
using Microsoft.CodeAnalysis.Shared.Extensions;
using Roslyn.Utilities;
using Microsoft.CodeAnalysis;
namespace ICSharpCode.NRefactory6.CSharp.ExtractMethod
{
abstract partial class MethodExtractor
{
protected readonly SelectionResult OriginalSelectionResult;
public MethodExtractor(SelectionResult selectionResult)
{
//Contract.ThrowIfNull(selectionResult);
this.OriginalSelectionResult = selectionResult;
}
protected abstract Task<AnalyzerResult> AnalyzeAsync(SelectionResult selectionResult, CancellationToken cancellationToken);
protected abstract Task<InsertionPoint> GetInsertionPointAsync(SemanticDocument document, int position, CancellationToken cancellationToken);
protected abstract Task<TriviaResult> PreserveTriviaAsync(SelectionResult selectionResult, CancellationToken cancellationToken);
protected abstract Task<SemanticDocument> ExpandAsync(SelectionResult selection, CancellationToken cancellationToken);
protected abstract Task<GeneratedCode> GenerateCodeAsync(InsertionPoint insertionPoint, SelectionResult selectionResult, AnalyzerResult analyzeResult, CancellationToken cancellationToken);
protected abstract SyntaxToken GetMethodNameAtInvocation(IEnumerable<SyntaxNodeOrToken> methodNames);
// protected abstract IEnumerable<IFormattingRule> GetFormattingRules(Document document);
protected abstract Task<OperationStatus> CheckTypeAsync(Document document, SyntaxNode contextNode, Location location, ITypeSymbol type, CancellationToken cancellationToken);
public async Task<ExtractMethodResult> ExtractMethodAsync(CancellationToken cancellationToken)
{
var operationStatus = this.OriginalSelectionResult.Status;
var analyzeResult = await AnalyzeAsync(this.OriginalSelectionResult, cancellationToken).ConfigureAwait(false);
cancellationToken.ThrowIfCancellationRequested();
operationStatus = await CheckVariableTypesAsync(analyzeResult.Status.With(operationStatus), analyzeResult, cancellationToken).ConfigureAwait(false);
if (operationStatus.FailedWithNoBestEffortSuggestion())
{
return new FailedExtractMethodResult(operationStatus);
}
var insertionPoint = await GetInsertionPointAsync(analyzeResult.SemanticDocument, this.OriginalSelectionResult.OriginalSpan.Start, cancellationToken).ConfigureAwait(false);
cancellationToken.ThrowIfCancellationRequested();
var triviaResult = await PreserveTriviaAsync(this.OriginalSelectionResult.With(insertionPoint.SemanticDocument), cancellationToken).ConfigureAwait(false);
cancellationToken.ThrowIfCancellationRequested();
var expandedDocument = await ExpandAsync(this.OriginalSelectionResult.With(triviaResult.SemanticDocument), cancellationToken).ConfigureAwait(false);
var generatedCode = await GenerateCodeAsync(
insertionPoint.With(expandedDocument),
this.OriginalSelectionResult.With(expandedDocument),
analyzeResult.With(expandedDocument),
cancellationToken).ConfigureAwait(false);
var applied = await triviaResult.ApplyAsync(generatedCode, cancellationToken).ConfigureAwait(false);
var afterTriviaRestored = applied.With(operationStatus);
cancellationToken.ThrowIfCancellationRequested();
if (afterTriviaRestored.Status.FailedWithNoBestEffortSuggestion())
{
return CreateExtractMethodResult(
operationStatus, generatedCode.SemanticDocument, generatedCode.MethodNameAnnotation, generatedCode.MethodDefinitionAnnotation);
}
var finalDocument = afterTriviaRestored.Data.Document;
finalDocument = await Formatter.FormatAsync(finalDocument, Formatter.Annotation, options: null,/* rules: GetFormattingRules(finalDocument), */cancellationToken: cancellationToken).ConfigureAwait(false);
cancellationToken.ThrowIfCancellationRequested();
return CreateExtractMethodResult(
operationStatus.With(generatedCode.Status),
await SemanticDocument.CreateAsync(finalDocument, cancellationToken).ConfigureAwait(false),
generatedCode.MethodNameAnnotation,
generatedCode.MethodDefinitionAnnotation);
}
private ExtractMethodResult CreateExtractMethodResult(
OperationStatus status, SemanticDocument semanticDocument,
SyntaxAnnotation invocationAnnotation, SyntaxAnnotation methodAnnotation)
{
var newRoot = semanticDocument.Root;
var annotatedTokens = newRoot.GetAnnotatedNodesAndTokens(invocationAnnotation);
var methodDefinition = newRoot.GetAnnotatedNodesAndTokens(methodAnnotation).FirstOrDefault().AsNode();
return new SimpleExtractMethodResult(status, semanticDocument.Document, GetMethodNameAtInvocation(annotatedTokens), methodDefinition);
}
private async Task<OperationStatus> CheckVariableTypesAsync(
OperationStatus status,
AnalyzerResult analyzeResult,
CancellationToken cancellationToken)
{
var document = analyzeResult.SemanticDocument;
// sync selection result to same semantic data as analyzeResult
var firstToken = this.OriginalSelectionResult.With(document).GetFirstTokenInSelection();
var context = firstToken.Parent;
var result = await TryCheckVariableTypeAsync(document, context, analyzeResult.GetVariablesToMoveIntoMethodDefinition(cancellationToken), status, cancellationToken).ConfigureAwait(false);
if (!result.Item1)
{
result = await TryCheckVariableTypeAsync(document, context, analyzeResult.GetVariablesToSplitOrMoveIntoMethodDefinition(cancellationToken), result.Item2, cancellationToken).ConfigureAwait(false);
if (!result.Item1)
{
result = await TryCheckVariableTypeAsync(document, context, analyzeResult.MethodParameters, result.Item2, cancellationToken).ConfigureAwait(false);
if (!result.Item1)
{
result = await TryCheckVariableTypeAsync(document, context, analyzeResult.GetVariablesToMoveOutToCallSite(cancellationToken), result.Item2, cancellationToken).ConfigureAwait(false);
if (!result.Item1)
{
result = await TryCheckVariableTypeAsync(document, context, analyzeResult.GetVariablesToSplitOrMoveOutToCallSite(cancellationToken), result.Item2, cancellationToken).ConfigureAwait(false);
if (!result.Item1)
{
return result.Item2;
}
}
}
}
}
status = result.Item2;
var checkedStatus = await CheckTypeAsync(document.Document, context, context.GetLocation(), analyzeResult.ReturnType, cancellationToken).ConfigureAwait(false);
return checkedStatus.With(status);
}
private async Task<Tuple<bool, OperationStatus>> TryCheckVariableTypeAsync(
SemanticDocument document, SyntaxNode contextNode, IEnumerable<VariableInfo> variables,
OperationStatus status, CancellationToken cancellationToken)
{
if (status.FailedWithNoBestEffortSuggestion())
{
return Tuple.Create(false, status);
}
var location = contextNode.GetLocation();
foreach (var variable in variables)
{
var originalType = variable.GetVariableType(document);
var result = await CheckTypeAsync(document.Document, contextNode, location, originalType, cancellationToken).ConfigureAwait(false);
if (result.FailedWithNoBestEffortSuggestion())
{
status = status.With(result);
return Tuple.Create(false, status);
}
}
return Tuple.Create(true, status);
}
public static string MakeMethodName(string prefix, string originalName)
{
var startingWithLetter = originalName.SkipWhile(c => !char.IsLetter(c)).ToArray();
var name = startingWithLetter.Length == 0 ? originalName : new string(startingWithLetter);
return char.IsUpper(name[0]) ?
prefix + name :
prefix + char.ToUpper(name[0]).ToString() + name.Substring(1);
}
}
}
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