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//
// Copyright (c) Microsoft Corporation. All rights reserved.
// Licensed under the MIT License. See License.txt in the project root for license information.
//
namespace Microsoft.VisualStudio.Text.Utilities
{
using System;
using System.Collections.Generic;
using Microsoft.VisualStudio.Text.Editor;
using Microsoft.VisualStudio.Utilities;
/// <summary>
/// Helper class to perform ContentType and TextViewRole match against a set of extensions.
/// </summary>
public static class UIExtensionSelector
{
/// <summary>
/// Given a list of extensions that provide text view roles, filter the list and return that
/// subset which matches at least one of the roles in the provided set of roles.
/// </summary>
public static List<Lazy<TProvider, TMetadataView>> SelectMatchingExtensions<TProvider, TMetadataView>
(IEnumerable<Lazy<TProvider, TMetadataView>> providerHandles,
ITextViewRoleSet viewRoles)
where TMetadataView : ITextViewRoleMetadata // text view role is required
{
var result = new List<Lazy<TProvider, TMetadataView>>();
foreach (var providerHandle in providerHandles)
{
IEnumerable<string> providerRoles = providerHandle.Metadata.TextViewRoles;
if (viewRoles.ContainsAny(providerRoles))
{
result.Add(providerHandle);
}
}
return result;
}
/// <summary>
/// Given a list of extensions that provide text view roles and content types, filter the list and return that
/// subset which matches the content types and at least one of the roles in the provided set of roles.
/// </summary>
public static List<Lazy<TProvider, TMetadataView>> SelectMatchingExtensions<TProvider, TMetadataView>
(IEnumerable<Lazy<TProvider, TMetadataView>> providerHandles,
IContentType documentContentType,
IContentType excludedContentType,
ITextViewRoleSet viewRoles)
where TMetadataView : IContentTypeAndTextViewRoleMetadata // both content type and text view role are required
{
var result = new List<Lazy<TProvider, TMetadataView>>();
foreach (var providerHandle in providerHandles)
{
// first, check content type match
if ((excludedContentType == null || !ExtensionSelector.ContentTypeMatch(excludedContentType, providerHandle.Metadata.ContentTypes)) &&
ExtensionSelector.ContentTypeMatch(documentContentType, providerHandle.Metadata.ContentTypes) &&
viewRoles.ContainsAny(providerHandle.Metadata.TextViewRoles))
{
result.Add(providerHandle);
}
}
return result;
}
/// <summary>
/// Given a list of extensions that provide text view roles and content types, return the
/// instantiated extension which best matches the given content type and matches at least one of the roles.
/// </summary>
public static TExtensionInstance InvokeBestMatchingFactory<TExtensionInstance, TExtensionFactory, TMetadataView>
(IEnumerable<Lazy<TExtensionFactory, TMetadataView>> providerHandles,
IContentType dataContentType,
ITextViewRoleSet viewRoles,
Func<TExtensionFactory, TExtensionInstance> getter,
IContentTypeRegistryService contentTypeRegistryService,
GuardedOperations guardedOperations,
object errorSource)
where TMetadataView : IContentTypeAndTextViewRoleMetadata // both content type and text view role are required
where TExtensionFactory : class
where TExtensionInstance : class
{
var roleMatchingProviderHandles = SelectMatchingExtensions(providerHandles, viewRoles);
return guardedOperations.InvokeBestMatchingFactory(roleMatchingProviderHandles, dataContentType, getter, contentTypeRegistryService, errorSource);
}
}
}
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