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Formatter.cs
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Formatter.cs
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// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.
using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading;
using System.Threading.Tasks;
using Microsoft.CodeAnalysis;
using Microsoft.CodeAnalysis.Formatting.Rules;
using Microsoft.CodeAnalysis.Options;
using Microsoft.CodeAnalysis.OrganizeImports;
using Microsoft.CodeAnalysis.Shared.Extensions;
using Microsoft.CodeAnalysis.Text;
using Roslyn.Utilities;
using static Microsoft.CodeAnalysis.Formatting.FormattingExtensions;
namespace Microsoft.CodeAnalysis.Formatting
{
/// <summary>
/// Formats whitespace in documents or syntax trees.
/// </summary>
public static class Formatter
{
/// <summary>
/// The annotation used to mark portions of a syntax tree to be formatted.
/// </summary>
public static SyntaxAnnotation Annotation { get; } = new SyntaxAnnotation();
/// <summary>
/// Gets the formatting rules that would be applied if left unspecified.
/// </summary>
internal static IEnumerable<AbstractFormattingRule> GetDefaultFormattingRules(Document document)
{
if (document == null)
{
throw new ArgumentNullException(nameof(document));
}
var service = document.GetLanguageService<ISyntaxFormattingService>();
if (service != null)
{
return service.GetDefaultFormattingRules();
}
else
{
return SpecializedCollections.EmptyEnumerable<AbstractFormattingRule>();
}
}
/// <summary>
/// Gets the formatting rules that would be applied if left unspecified.
/// </summary>
internal static IEnumerable<AbstractFormattingRule> GetDefaultFormattingRules(Workspace workspace, string language)
{
if (workspace == null)
{
throw new ArgumentNullException(nameof(workspace));
}
if (language == null)
{
throw new ArgumentNullException(nameof(language));
}
var service = workspace.Services.GetLanguageServices(language).GetService<ISyntaxFormattingService>();
if (service != null)
{
return service.GetDefaultFormattingRules();
}
else
{
return SpecializedCollections.EmptyEnumerable<AbstractFormattingRule>();
}
}
/// <summary>
/// Formats the whitespace in a document.
/// </summary>
/// <param name="document">The document to format.</param>
/// <param name="options">An optional set of formatting options. If these options are not supplied the current set of options from the document's workspace will be used.</param>
/// <param name="cancellationToken">An optional cancellation token.</param>
/// <returns>The formatted document.</returns>
public static Task<Document> FormatAsync(Document document, OptionSet options = null, CancellationToken cancellationToken = default)
=> FormatAsync(document, spans: null, options: options, cancellationToken: cancellationToken);
/// <summary>
/// Formats the whitespace in an area of a document corresponding to a text span.
/// </summary>
/// <param name="document">The document to format.</param>
/// <param name="span">The span of the document's text to format.</param>
/// <param name="options">An optional set of formatting options. If these options are not supplied the current set of options from the document's workspace will be used.</param>
/// <param name="cancellationToken">An optional cancellation token.</param>
/// <returns>The formatted document.</returns>
public static Task<Document> FormatAsync(Document document, TextSpan span, OptionSet options = null, CancellationToken cancellationToken = default)
=> FormatAsync(document, SpecializedCollections.SingletonEnumerable(span), options, cancellationToken);
/// <summary>
/// Formats the whitespace in areas of a document corresponding to multiple non-overlapping spans.
/// </summary>
/// <param name="document">The document to format.</param>
/// <param name="spans">The spans of the document's text to format.</param>
/// <param name="options">An optional set of formatting options. If these options are not supplied the current set of options from the document's workspace will be used.</param>
/// <param name="cancellationToken">An optional cancellation token.</param>
/// <returns>The formatted document.</returns>
public static Task<Document> FormatAsync(Document document, IEnumerable<TextSpan> spans, OptionSet options = null, CancellationToken cancellationToken = default)
{
var formattingService = document.GetLanguageService<IFormattingService>();
return formattingService == null
? SpecializedTasks.FromResult(document)
: formattingService.FormatAsync(document, spans, options, cancellationToken);
}
internal static async Task<Document> FormatAsync(Document document, IEnumerable<TextSpan> spans, OptionSet options, IEnumerable<AbstractFormattingRule> rules, CancellationToken cancellationToken)
{
if (document == null)
{
throw new ArgumentNullException(nameof(document));
}
var root = await document.GetSyntaxRootAsync(cancellationToken).ConfigureAwait(false);
var documentOptions = options ?? await document.GetOptionsAsync(cancellationToken).ConfigureAwait(false);
return document.WithSyntaxRoot(Format(root, spans, document.Project.Solution.Workspace, documentOptions, rules, cancellationToken));
}
/// <summary>
/// Formats the whitespace in areas of a document corresponding to annotated nodes.
/// </summary>
/// <param name="document">The document to format.</param>
/// <param name="annotation">The annotation used to find on nodes to identify spans to format.</param>
/// <param name="options">An optional set of formatting options. If these options are not supplied the current set of options from the document's workspace will be used.</param>
/// <param name="cancellationToken">An optional cancellation token.</param>
/// <returns>The formatted document.</returns>
public static Task<Document> FormatAsync(Document document, SyntaxAnnotation annotation, OptionSet options = null, CancellationToken cancellationToken = default)
=> FormatAsync(document, annotation, options, rules: null, cancellationToken: cancellationToken);
internal static async Task<Document> FormatAsync(Document document, SyntaxAnnotation annotation, OptionSet options, IEnumerable<AbstractFormattingRule> rules, CancellationToken cancellationToken)
{
if (document == null)
{
throw new ArgumentNullException(nameof(document));
}
if (annotation == null)
{
throw new ArgumentNullException(nameof(annotation));
}
var root = await document.GetSyntaxRootAsync(cancellationToken).ConfigureAwait(false);
var documentOptions = options ?? await document.GetOptionsAsync(cancellationToken).ConfigureAwait(false);
return document.WithSyntaxRoot(Format(root, annotation, document.Project.Solution.Workspace, documentOptions, rules, cancellationToken));
}
/// <summary>
/// Formats the whitespace in areas of a syntax tree corresponding to annotated nodes.
/// </summary>
/// <param name="node">The root node of a syntax tree to format.</param>
/// <param name="annotation">The annotation used to find nodes to identify spans to format.</param>
/// <param name="workspace">A workspace used to give the formatting context.</param>
/// <param name="options">An optional set of formatting options. If these options are not supplied the current set of options from the workspace will be used.</param>
/// <param name="cancellationToken">An optional cancellation token.</param>
/// <returns>The formatted tree's root node.</returns>
public static SyntaxNode Format(SyntaxNode node, SyntaxAnnotation annotation, Workspace workspace, OptionSet options = null, CancellationToken cancellationToken = default)
=> Format(node, annotation, workspace, options, rules: null, cancellationToken: cancellationToken);
internal static SyntaxNode Format(SyntaxNode node, SyntaxAnnotation annotation, Workspace workspace, OptionSet options, IEnumerable<AbstractFormattingRule> rules, CancellationToken cancellationToken)
{
if (workspace == null)
{
throw new ArgumentNullException(nameof(workspace));
}
if (node == null)
{
throw new ArgumentNullException(nameof(node));
}
if (annotation == null)
{
throw new ArgumentNullException(nameof(annotation));
}
var spans = (annotation == SyntaxAnnotation.ElasticAnnotation)
? GetElasticSpans(node)
: GetAnnotatedSpans(node, annotation);
return Format(node, spans, workspace, options, rules, cancellationToken);
}
/// <summary>
/// Formats the whitespace of a syntax tree.
/// </summary>
/// <param name="node">The root node of a syntax tree to format.</param>
/// <param name="workspace">A workspace used to give the formatting context.</param>
/// <param name="options">An optional set of formatting options. If these options are not supplied the current set of options from the workspace will be used.</param>
/// <param name="cancellationToken">An optional cancellation token.</param>
/// <returns>The formatted tree's root node.</returns>
public static SyntaxNode Format(SyntaxNode node, Workspace workspace, OptionSet options = null, CancellationToken cancellationToken = default)
=> Format(node, SpecializedCollections.SingletonEnumerable(node.FullSpan), workspace, options, rules: null, cancellationToken: cancellationToken);
/// <summary>
/// Formats the whitespace in areas of a syntax tree identified by a span.
/// </summary>
/// <param name="node">The root node of a syntax tree to format.</param>
/// <param name="span">The span within the node's full span to format.</param>
/// <param name="workspace">A workspace used to give the formatting context.</param>
/// <param name="options">An optional set of formatting options. If these options are not supplied the current set of options from the workspace will be used.</param>
/// <param name="cancellationToken">An optional cancellation token.</param>
/// <returns>The formatted tree's root node.</returns>
public static SyntaxNode Format(SyntaxNode node, TextSpan span, Workspace workspace, OptionSet options = null, CancellationToken cancellationToken = default)
=> Format(node, SpecializedCollections.SingletonEnumerable(span), workspace, options, rules: null, cancellationToken: cancellationToken);
/// <summary>
/// Formats the whitespace in areas of a syntax tree identified by multiple non-overlapping spans.
/// </summary>
/// <param name="node">The root node of a syntax tree to format.</param>
/// <param name="spans">The spans within the node's full span to format.</param>
/// <param name="workspace">A workspace used to give the formatting context.</param>
/// <param name="options">An optional set of formatting options. If these options are not supplied the current set of options from the workspace will be used.</param>
/// <param name="cancellationToken">An optional cancellation token.</param>
/// <returns>The formatted tree's root node.</returns>
public static SyntaxNode Format(SyntaxNode node, IEnumerable<TextSpan> spans, Workspace workspace, OptionSet options = null, CancellationToken cancellationToken = default)
=> Format(node, spans, workspace, options, rules: null, cancellationToken: cancellationToken);
internal static SyntaxNode Format(SyntaxNode node, IEnumerable<TextSpan> spans, Workspace workspace, OptionSet options, IEnumerable<AbstractFormattingRule> rules, CancellationToken cancellationToken)
{
var formattingResult = GetFormattingResult(node, spans, workspace, options, rules, cancellationToken);
return formattingResult == null ? node : formattingResult.GetFormattedRoot(cancellationToken);
}
internal static IFormattingResult GetFormattingResult(SyntaxNode node, IEnumerable<TextSpan> spans, Workspace workspace, OptionSet options, IEnumerable<AbstractFormattingRule> rules, CancellationToken cancellationToken)
{
if (workspace == null)
{
throw new ArgumentNullException(nameof(workspace));
}
if (node == null)
{
throw new ArgumentNullException(nameof(node));
}
var languageFormatter = workspace.Services.GetLanguageServices(node.Language).GetService<ISyntaxFormattingService>();
if (languageFormatter == null)
{
return null;
}
var optionService = workspace.Services.GetRequiredService<IOptionService>();
options ??= workspace.Options;
rules ??= GetDefaultFormattingRules(workspace, node.Language);
spans ??= SpecializedCollections.SingletonEnumerable(node.FullSpan);
var shouldUseFormattingSpanCollapse = options.GetOption(FormattingOptions.AllowDisjointSpanMerging);
return languageFormatter.Format(node, spans, shouldUseFormattingSpanCollapse, options.AsAnalyzerConfigOptions(optionService, node.Language), rules, cancellationToken);
}
/// <summary>
/// Determines the changes necessary to format the whitespace of a syntax tree.
/// </summary>
/// <param name="node">The root node of a syntax tree to format.</param>
/// <param name="workspace">A workspace used to give the formatting context.</param>
/// <param name="options">An optional set of formatting options. If these options are not supplied the current set of options from the workspace will be used.</param>
/// <param name="cancellationToken">An optional cancellation token.</param>
/// <returns>The changes necessary to format the tree.</returns>
public static IList<TextChange> GetFormattedTextChanges(SyntaxNode node, Workspace workspace, OptionSet options = null, CancellationToken cancellationToken = default)
=> GetFormattedTextChanges(node, SpecializedCollections.SingletonEnumerable(node.FullSpan), workspace, options, rules: null, cancellationToken: cancellationToken);
/// <summary>
/// Determines the changes necessary to format the whitespace of a syntax tree.
/// </summary>
/// <param name="node">The root node of a syntax tree to format.</param>
/// <param name="span">The span within the node's full span to format.</param>
/// <param name="workspace">A workspace used to give the formatting context.</param>
/// <param name="options">An optional set of formatting options. If these options are not supplied the current set of options from the workspace will be used.</param>
/// <param name="cancellationToken">An optional cancellation token.</param>
/// <returns>The changes necessary to format the tree.</returns>
public static IList<TextChange> GetFormattedTextChanges(SyntaxNode node, TextSpan span, Workspace workspace, OptionSet options = null, CancellationToken cancellationToken = default)
=> GetFormattedTextChanges(node, SpecializedCollections.SingletonEnumerable(span), workspace, options, rules: null, cancellationToken: cancellationToken);
/// <summary>
/// Determines the changes necessary to format the whitespace of a syntax tree.
/// </summary>
/// <param name="node">The root node of a syntax tree to format.</param>
/// <param name="spans">The spans within the node's full span to format.</param>
/// <param name="workspace">A workspace used to give the formatting context.</param>
/// <param name="options">An optional set of formatting options. If these options are not supplied the current set of options from the workspace will be used.</param>
/// <param name="cancellationToken">An optional cancellation token.</param>
/// <returns>The changes necessary to format the tree.</returns>
public static IList<TextChange> GetFormattedTextChanges(SyntaxNode node, IEnumerable<TextSpan> spans, Workspace workspace, OptionSet options = null, CancellationToken cancellationToken = default)
=> GetFormattedTextChanges(node, spans, workspace, options, rules: null, cancellationToken: cancellationToken);
internal static IList<TextChange> GetFormattedTextChanges(SyntaxNode node, IEnumerable<TextSpan> spans, Workspace workspace, OptionSet options, IEnumerable<AbstractFormattingRule> rules, CancellationToken cancellationToken)
{
var formattingResult = GetFormattingResult(node, spans, workspace, options, rules, cancellationToken);
return formattingResult == null
? SpecializedCollections.EmptyList<TextChange>()
: formattingResult.GetTextChanges(cancellationToken);
}
/// <summary>
/// Organizes the imports in the document.
/// </summary>
/// <param name="document">The document to organize.</param>
/// <param name="cancellationToken">The cancellation token that the operation will observe.</param>
/// <returns>The document with organized imports. If the language does not support organizing imports, or if no changes were made, this method returns <paramref name="document"/>.</returns>
public static Task<Document> OrganizeImportsAsync(Document document, CancellationToken cancellationToken = default)
{
var organizeImportsService = document.GetLanguageService<IOrganizeImportsService>();
if (organizeImportsService is null)
{
return Task.FromResult(document);
}
return organizeImportsService.OrganizeImportsAsync(document, cancellationToken);
}
}
}