70 lines
3.6 KiB
C#
70 lines
3.6 KiB
C#
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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.
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using System.Collections.Generic;
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using System.Linq;
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using System.Threading;
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using Microsoft.CodeAnalysis;
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using Microsoft.CodeAnalysis.Formatting;
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using Microsoft.CodeAnalysis.Formatting.Rules;
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using Microsoft.CodeAnalysis.LanguageServices;
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using Microsoft.CodeAnalysis.Options;
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using Microsoft.CodeAnalysis.Shared.Extensions;
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using Microsoft.CodeAnalysis.Text;
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using Roslyn.Utilities;
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namespace dnSpy.Roslyn.Internal.SmartIndent
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{
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internal abstract partial class AbstractIndentationService : ISynchronousIndentationService
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{
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protected abstract IFormattingRule GetSpecializedIndentationFormattingRule();
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private IEnumerable<IFormattingRule> GetFormattingRules(Document document, int position)
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{
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var workspace = document.Project.Solution.Workspace;
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var formattingRuleFactory = workspace.Services.GetService<IHostDependentFormattingRuleFactoryService>();
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var baseIndentationRule = formattingRuleFactory.CreateRule(document, position);
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var formattingRules = new[] { baseIndentationRule, this.GetSpecializedIndentationFormattingRule() }.Concat(Formatter.GetDefaultFormattingRules(document));
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return formattingRules;
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}
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public IndentationResult? GetDesiredIndentation(
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Document document, int lineNumber, CancellationToken cancellationToken)
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{
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var root = document.GetSyntaxRootSynchronously(cancellationToken);
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var sourceText = root.SyntaxTree.GetText(cancellationToken);
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var documentOptions = document.GetOptionsAsync(cancellationToken).WaitAndGetResult(cancellationToken);
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var lineToBeIndented = sourceText.Lines[lineNumber];
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var formattingRules = GetFormattingRules(document, lineToBeIndented.Start);
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// There are two important cases for indentation. The first is when we're simply
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// trying to figure out the appropriate indentation on a blank line (i.e. after
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// hitting enter at the end of a line, or after moving to a blank line). The
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// second is when we're trying to figure out indentation for a non-blank line
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// (i.e. after hitting enter in the middle of a line, causing tokens to move to
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// the next line). If we're in the latter case, we defer to the Formatting engine
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// as we need it to use all its rules to determine where the appropriate location is
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// for the following tokens to go.
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if (ShouldUseSmartTokenFormatterInsteadOfIndenter(formattingRules, root, lineToBeIndented, documentOptions, cancellationToken))
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{
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return null;
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}
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var indenter = GetIndenter(
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document.GetLanguageService<ISyntaxFactsService>(),
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root.SyntaxTree, lineToBeIndented, formattingRules,
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documentOptions, cancellationToken);
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return indenter.GetDesiredIndentation(document);
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}
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protected abstract AbstractIndenter GetIndenter(
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ISyntaxFactsService syntaxFacts, SyntaxTree syntaxTree, TextLine lineToBeIndented, IEnumerable<IFormattingRule> formattingRules, OptionSet optionSet, CancellationToken cancellationToken);
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protected abstract bool ShouldUseSmartTokenFormatterInsteadOfIndenter(
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IEnumerable<IFormattingRule> formattingRules, SyntaxNode root, TextLine line, OptionSet optionSet, CancellationToken cancellationToken);
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}
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}
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