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HandlerGeneratorStrategy.cs
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using System;
using System.Collections.Generic;
using System.Linq;
using Microsoft.CodeAnalysis;
using Microsoft.CodeAnalysis.CSharp;
using Microsoft.CodeAnalysis.CSharp.Syntax;
using OmniSharp.Extensions.JsonRpc.Generators.Contexts;
using static Microsoft.CodeAnalysis.CSharp.SyntaxFactory;
namespace OmniSharp.Extensions.JsonRpc.Generators.Strategies
{
internal class HandlerGeneratorStrategy : ICompilationUnitGeneratorStrategy
{
public IEnumerable<MemberDeclarationSyntax> Apply(GeneratorData item)
{
if (item.JsonRpcAttributes.GenerateHandler is not { }) yield break;
var members = new List<MemberDeclarationSyntax>();
var resolver = GeneratorData.CreateForResolver(item);
var attributesToCopy = AttributeList(
SeparatedList(
item.TypeDeclaration.AttributeLists
.SelectMany(z => z.Attributes.Where(AttributeFilter))
)
);
var interfaceName = $"I{item.JsonRpcAttributes.HandlerName}Handler";
item.AssemblyJsonRpcHandlersAttributeArguments.Add(AttributeArgument(TypeOfExpression(ParseName($"{item.JsonRpcAttributes.HandlerNamespace}.{interfaceName}"))));
var handlerInterface = InterfaceDeclaration(Identifier(interfaceName))
.WithAttributeLists(
List(
new[] {
attributesToCopy,
AttributeList(SingletonSeparatedList(Attribute(ParseName("System.Runtime.CompilerServices.CompilerGeneratedAttribute"))))
}
)
)
.WithModifiers(item.TypeDeclaration.Modifiers)
.AddBaseListTypes(SimpleBaseType(GetBaseHandlerInterface(item)));
if (item is RequestItem { Response: { Symbol: ITypeParameterSymbol } } ri)
{
handlerInterface = handlerInterface.AddTypeParameterListParameters(TypeParameter(ri.Response.Symbol.Name));
}
if (item.Request.Symbol.AllInterfaces.Any(z => z.Name == "IDoesNotParticipateInRegistration"))
{
handlerInterface = handlerInterface.AddBaseListTypes(SimpleBaseType(IdentifierName("IDoesNotParticipateInRegistration")));
}
if (!handlerInterface.Modifiers.Any(z => z.IsKind(SyntaxKind.PartialKeyword)))
{
handlerInterface = handlerInterface.AddModifiers(Token(SyntaxKind.PartialKeyword));
}
if (item.JsonRpcAttributes.AllowDerivedRequests)
{
handlerInterface = handlerInterface
.WithTypeParameterList(
TypeParameterList(
SingletonSeparatedList(
TypeParameter(Identifier("T")).WithVarianceKeyword(Token(SyntaxKind.InKeyword))
)
)
)
.WithConstraintClauses(
SingletonList(
TypeParameterConstraintClause(IdentifierName("T"))
.WithConstraints(
SingletonSeparatedList<TypeParameterConstraintSyntax>(
TypeConstraint(item.Request.Syntax)
)
)
)
);
members.Add(
InterfaceDeclaration(handlerInterface.Identifier)
.WithModifiers(handlerInterface.Modifiers)
.WithBaseList(
BaseList(
SingletonSeparatedList<BaseTypeSyntax>(
SimpleBaseType(GenericName(handlerInterface.Identifier.Text).AddTypeArgumentListArguments(item.Request.Syntax))
)
)
)
);
}
if (GetRegistrationAndOrCapability(item) is { } registrationAndOrCapability)
{
handlerInterface = handlerInterface.AddBaseListTypes(SimpleBaseType(registrationAndOrCapability));
}
var classAttributes =
SingletonList(
AttributeList(
SeparatedList(
new[] {
Attribute(ParseName("System.Runtime.CompilerServices.CompilerGeneratedAttribute")),
Attribute(ParseName("System.Diagnostics.CodeAnalysis.ExcludeFromCodeCoverageAttribute")),
}.Concat(
attributesToCopy.Attributes
.Where(z => z.IsAttribute("Obsolete"))
).ToArray()
)
)
);
{
var baseClass = GetBaseHandlerClass(item);
var handlerClass = ClassDeclaration(Identifier($"{item.JsonRpcAttributes.HandlerName}HandlerBase"))
.WithAttributeLists(classAttributes)
.WithTypeParameterList(handlerInterface.TypeParameterList)
.AddModifiers(Token(SyntaxKind.AbstractKeyword))
.AddModifiers(handlerInterface.Modifiers.ToArray());
if (item.JsonRpcAttributes.AllowDerivedRequests)
{
handlerClass = handlerClass
.WithTypeParameterList(
TypeParameterList(
SingletonSeparatedList(
TypeParameter(Identifier("T"))
)
)
)
.WithConstraintClauses(
SingletonList(
TypeParameterConstraintClause(IdentifierName("T"))
.WithConstraints(
SingletonSeparatedList<TypeParameterConstraintSyntax>(
TypeConstraint(item.Request.Syntax)
)
)
)
);
members.Add(
ClassDeclaration(handlerClass.Identifier)
.WithAttributeLists(handlerClass.AttributeLists)
.AddModifiers(Token(SyntaxKind.AbstractKeyword))
.AddModifiers(handlerInterface.Modifiers.ToArray())
.WithBaseList(
BaseList(
SeparatedList<BaseTypeSyntax>(
new[] {
SimpleBaseType(GenericName(handlerClass.Identifier.Text).AddTypeArgumentListArguments(item.Request.Syntax)),
SimpleBaseType(IdentifierName(handlerInterface.Identifier.Text)),
}
)
)
)
);
}
if (baseClass is { })
{
handlerClass = handlerClass.AddBaseListTypes(SimpleBaseType(baseClass));
}
if (item.JsonRpcAttributes.AllowDerivedRequests)
{
handlerClass = handlerClass.AddBaseListTypes(
SimpleBaseType(
GenericName($"I{item.JsonRpcAttributes.HandlerName}Handler")
.WithTypeArgumentList(
TypeArgumentList(
SingletonSeparatedList<TypeSyntax>(
IdentifierName("T")
)
)
)
)
);
}
else
{
handlerClass = handlerClass.AddBaseListTypes(
SimpleBaseType(
item is RequestItem { Response: { Symbol: ITypeParameterSymbol s } }
? GenericName($"I{item.JsonRpcAttributes.HandlerName}Handler").WithTypeArgumentList(
TypeArgumentList(SingletonSeparatedList<TypeSyntax>(IdentifierName(s.Name)))
)
: IdentifierName($"I{item.JsonRpcAttributes.HandlerName}Handler")
)
);
}
if (resolver is { })
{
handlerClass = handlerClass
.AddBaseListTypes(SimpleBaseType(IdentifierName($"I{resolver.JsonRpcAttributes.HandlerName}Handler")));
}
if (item.LspAttributes?.CanBeResolved == true && item is RequestItem r)
{
handlerInterface = handlerInterface.AddBaseListTypes(SimpleBaseType(IdentifierName("ICanBeIdentifiedHandler")));
handlerClass = handlerClass
.AddMembers(AddConstructors(r, r, false).ToArray())
.AddMembers(AddCanBeIdentifiedMembers().ToArray());
}
else if (resolver is { } && item is RequestItem r2)
{
handlerClass = handlerClass
.AddMembers(AddConstructors(r2, resolver, false).ToArray())
.AddMembers(AddCanBeIdentifiedMembers().ToArray())
.AddMembers(AddResolveMethod(resolver.Request.Syntax));
}
members.Insert(0, handlerClass);
members.Insert(0, handlerInterface);
if (item is RequestItem r3)
{
if (resolver is { LspAttributes: { GenerateTypedData: true } })
{
members.Add(
GenerateTypedHandler(
handlerClass,
r3,
resolver
)
);
}
}
}
if (item is RequestItem request)
{
ClassDeclarationSyntax? handlerClass = null;
if (request is { PartialItem: { } })
{
handlerClass = ClassDeclaration(Identifier($"{item.JsonRpcAttributes.HandlerName}PartialHandlerBase"))
.WithAttributeLists(classAttributes)
.AddModifiers(Token(SyntaxKind.AbstractKeyword))
.AddModifiers(handlerInterface.Modifiers.ToArray())
.AddBaseListTypes(
SimpleBaseType(GetPartialResultBaseClass(request, request.PartialItem)),
SimpleBaseType(IdentifierName($"I{item.JsonRpcAttributes.HandlerName}Handler"))
);
if (item.LspAttributes?.CanBeResolved == true && item is RequestItem r)
{
handlerClass = handlerClass
.AddMembers(AddConstructors(r, r, true).ToArray())
.AddMembers(AddCanBeIdentifiedMembers().ToArray());
}
else if (resolver is { })
{
handlerClass = handlerClass
.AddMembers(AddConstructors(request, resolver, true).ToArray())
.AddBaseListTypes(SimpleBaseType(IdentifierName($"I{resolver.JsonRpcAttributes.HandlerName}Handler")))
.AddMembers(AddCanBeIdentifiedMembers().ToArray())
.AddMembers(AddResolveMethod(resolver.Request.Syntax));
}
else
{
handlerClass = handlerClass
.AddMembers(AddConstructors(request, resolver, true).ToArray());
}
members.Add(handlerClass);
}
else if (request is { PartialItems: { } partialItems })
{
handlerClass = ClassDeclaration(Identifier($"{item.JsonRpcAttributes.HandlerName}PartialHandlerBase"))
.WithAttributeLists(classAttributes)
.AddModifiers(Token(SyntaxKind.AbstractKeyword))
.AddModifiers(handlerInterface.Modifiers.ToArray())
.AddBaseListTypes(
SimpleBaseType(GetPartialResultsBaseClass(request, request.PartialItems)),
SimpleBaseType(IdentifierName($"I{item.JsonRpcAttributes.HandlerName}Handler"))
);
if (item.LspAttributes?.CanBeResolved == true && item is RequestItem r)
{
handlerClass = handlerClass
.AddMembers(AddConstructors(r, r, true).ToArray())
.AddMembers(AddCanBeIdentifiedMembers().ToArray());
}
else if (resolver is { })
{
handlerClass = handlerClass
.AddMembers(AddConstructors(request, resolver, true).ToArray())
.AddBaseListTypes(SimpleBaseType(IdentifierName($"I{resolver.JsonRpcAttributes.HandlerName}Handler")))
.AddMembers(AddCanBeIdentifiedMembers().ToArray())
.AddMembers(AddResolveMethod(resolver.Request.Syntax));
}
else
{
handlerClass = handlerClass
.AddMembers(AddConstructors(request, resolver, true).ToArray());
}
members.Add(handlerClass);
if (resolver is { LspAttributes: { GenerateTypedData: true } })
{
members.Add(
GenerateTypedPartialHandler(
handlerClass,
request,
resolver,
partialItems
)
);
}
if (request is { LspAttributes: { GenerateTypedData: true } })
{
members.Add(
GenerateTypedPartialHandler(
handlerClass,
request,
request,
partialItems
)
);
}
}
}
if (members.Count == 0) yield break;
yield return NamespaceDeclaration(ParseName(item.JsonRpcAttributes.HandlerNamespace))
.WithMembers(List(members))
.WithLeadingTrivia(TriviaList(Trivia(NullableDirectiveTrivia(Token(SyntaxKind.EnableKeyword), true))))
.WithTrailingTrivia(TriviaList(Trivia(NullableDirectiveTrivia(Token(SyntaxKind.RestoreKeyword), true))));
}
private static GenericNameSyntax GetBaseHandlerInterface(GeneratorData item)
{
var requestType = item.JsonRpcAttributes.AllowDerivedRequests ? IdentifierName("T") : item.Request.Syntax;
if (item is NotificationItem)
{
return GenericName("IJsonRpcNotificationHandler")
.WithTypeArgumentList(TypeArgumentList(SingletonSeparatedList(requestType)));
}
if (item is RequestItem request)
{
return GenericName("IJsonRpcRequestHandler")
.WithTypeArgumentList(TypeArgumentList(SeparatedList(new[] { requestType, request.Response.Syntax })));
}
throw new NotSupportedException();
}
private static TypeSyntax? GetBaseHandlerClass(GeneratorData item)
{
var onlyCapability = item is { Capability: { }, RegistrationOptions: null };
var requestType = item.JsonRpcAttributes.AllowDerivedRequests ? IdentifierName("T") : item.Request.Syntax;
var types = new List<TypeSyntax>() { requestType };
if (item.RegistrationOptions is { })
{
types.Add(item.RegistrationOptions.Syntax);
}
if (item.Capability is { })
{
types.Add(item.Capability.Syntax);
}
if (item is NotificationItem)
{
return QualifiedName(
IdentifierName("AbstractHandlers"),
GenericName($"Notification{( onlyCapability ? "Capability" : "" )}")
.WithTypeArgumentList(TypeArgumentList(SeparatedList(types)))
);
}
if (item is RequestItem request)
{
types.Insert(1, request.Response.Syntax);
return QualifiedName(
IdentifierName("AbstractHandlers"),
GenericName($"Request{( onlyCapability ? "Capability" : "" )}")
.WithTypeArgumentList(TypeArgumentList(SeparatedList(types)))
);
}
return null;
}
private static TypeSyntax GetPartialResultBaseClass(RequestItem request, SyntaxSymbol item)
{
var onlyCapability = request is { Capability: { }, RegistrationOptions: null };
var types = new List<TypeSyntax> { request.Request.Syntax, request.Response.Syntax, item.Syntax };
if (request.RegistrationOptions is { })
{
types.Add(request.RegistrationOptions.Syntax);
}
if (request.Capability is { })
{
types.Add(request.Capability.Syntax);
}
return QualifiedName(
IdentifierName("AbstractHandlers"),
GenericName($"PartialResult{( onlyCapability ? "Capability" : "" )}")
.WithTypeArgumentList(TypeArgumentList(SeparatedList(types)))
);
}
private static TypeSyntax GetPartialResultsBaseClass(RequestItem request, SyntaxSymbol item)
{
var onlyCapability = request is { Capability: { }, RegistrationOptions: null };
var types = new List<TypeSyntax> { request.Request.Syntax, request.Response.Syntax, item.Syntax };
if (request.RegistrationOptions is { })
{
types.Add(request.RegistrationOptions.Syntax);
}
if (request.Capability is { })
{
types.Add(request.Capability.Syntax);
}
return QualifiedName(
IdentifierName("AbstractHandlers"),
GenericName($"PartialResults{( onlyCapability ? "Capability" : "" )}")
.WithTypeArgumentList(TypeArgumentList(SeparatedList(types)))
);
}
private static GenericNameSyntax? GetRegistrationAndOrCapability(GeneratorData item)
{
if (item.Capability is { } && item.RegistrationOptions is { })
{
return GenericName("IRegistration")
.WithTypeArgumentList(TypeArgumentList(SeparatedList(new[] { item.RegistrationOptions.Syntax, item.Capability.Syntax })));
}
if (item.RegistrationOptions is { })
{
return GenericName("IRegistration")
.WithTypeArgumentList(TypeArgumentList(SingletonSeparatedList(item.RegistrationOptions.Syntax)));
}
if (item.Capability is { })
{
return GenericName("ICapability")
.WithTypeArgumentList(TypeArgumentList(SingletonSeparatedList(item.Capability.Syntax)));
}
return null;
}
private static bool AttributeFilter(AttributeSyntax syntax)
{
var fullString = syntax.Name.ToFullString();
return !fullString.Contains("Generate")
&& !fullString.Contains("DebuggerDisplay")
&& !fullString.Contains("RegistrationOptions")
&& !fullString.Contains("Capability")
&& !fullString.Contains("Resolver");
}
private static ConstructorDeclarationSyntax GetConstructor(
RequestItem request,
ParameterListSyntax parameters,
ConstructorInitializerSyntax constructorInitializerSyntax,
bool isPartial
)
{
return ConstructorDeclaration(
Identifier(
isPartial
? $"{request.JsonRpcAttributes.HandlerName}PartialHandlerBase"
: $"{request.JsonRpcAttributes.HandlerName}HandlerBase"
)
)
.WithModifiers(TokenList(Token(SyntaxKind.ProtectedKeyword)))
.WithParameterList(parameters)
.WithInitializer(constructorInitializerSyntax)
.WithBody(Block());
}
private static MemberDeclarationSyntax AddResolveMethod(TypeSyntax syntax)
{
return MethodDeclaration(
GenericName(Identifier("Task")).WithTypeArgumentList(TypeArgumentList(SingletonSeparatedList(syntax))),
Identifier("Handle")
)
.WithModifiers(TokenList(Token(SyntaxKind.PublicKeyword), Token(SyntaxKind.AbstractKeyword)))
.WithParameterList(
ParameterList(
SeparatedList(
new[] {
Parameter(Identifier("request")).WithType(syntax),
Parameter(Identifier("cancellationToken")).WithType(IdentifierName("CancellationToken"))
}
)
)
)
.WithSemicolonToken(Token(SyntaxKind.SemicolonToken));
}
private static IEnumerable<MemberDeclarationSyntax> AddCanBeIdentifiedMembers()
{
yield return FieldDeclaration(VariableDeclaration(IdentifierName("Guid")).WithVariables(SingletonSeparatedList(VariableDeclarator(Identifier("_id")))))
.WithModifiers(TokenList(Token(SyntaxKind.PrivateKeyword), Token(SyntaxKind.ReadOnlyKeyword)));
yield return PropertyDeclaration(IdentifierName("Guid"), Identifier("Id"))
.WithExplicitInterfaceSpecifier(ExplicitInterfaceSpecifier(IdentifierName("ICanBeIdentifiedHandler")))
.WithExpressionBody(ArrowExpressionClause(IdentifierName("_id")))
.WithSemicolonToken(Token(SyntaxKind.SemicolonToken));
}
private static IEnumerable<MemberDeclarationSyntax> AddConstructors(RequestItem request, RequestItem? resolver, bool isPartial)
{
var parameters = ParameterList();
var arguments = ArgumentList();
if (isPartial)
{
parameters = parameters.AddParameters(Parameter(Identifier("progressManager")).WithType(IdentifierName("IProgressManager")));
arguments = arguments.AddArguments(Argument(IdentifierName("progressManager")));
if (request.PartialItem is { } || request.PartialItems is { })
{
arguments = arguments.AddArguments(
Argument(
MemberAccessExpression(
SyntaxKind.SimpleMemberAccessExpression,
request.Response.Syntax.EnsureNotNullable(),
IdentifierName("From")
)
)
);
}
}
if (resolver is { })
{
yield return GetConstructor(
request,
ParameterList(
SingletonSeparatedList(
Parameter(Identifier("id")).WithType(
ParseName("System.Guid")
)
)
).AddParameters(parameters.Parameters.ToArray()),
ConstructorInitializer(SyntaxKind.BaseConstructorInitializer, arguments),
isPartial
)
.WithBody(
Block(
SingletonList<StatementSyntax>(
ExpressionStatement(
AssignmentExpression(SyntaxKind.SimpleAssignmentExpression, IdentifierName("_id"), IdentifierName("id"))
)
)
)
);
yield return GetConstructor(
request,
parameters,
ConstructorInitializer(
SyntaxKind.ThisConstructorInitializer,
ArgumentList(
SingletonSeparatedList(
Argument(
InvocationExpression(
MemberAccessExpression(
SyntaxKind.SimpleMemberAccessExpression,
IdentifierName("Guid"),
IdentifierName("NewGuid")
)
)
)
)
)
.AddArguments(arguments.Arguments.Take(Math.Max(0, arguments.Arguments.Count - 1)).ToArray())
),
isPartial
);
}
else
{
yield return GetConstructor(
request,
ParameterList(
SingletonSeparatedList(
Parameter(Identifier("id")).WithType(
ParseName("System.Guid")
)
)
).AddParameters(parameters.Parameters.ToArray()),
ConstructorInitializer(SyntaxKind.BaseConstructorInitializer, arguments),
isPartial
);
}
}
private static TypeDeclarationSyntax GenerateTypedPartialHandler(
TypeDeclarationSyntax classDeclarationSyntax,
RequestItem item,
RequestItem resolver,
SyntaxSymbol partialItems
)
{
return ClassDeclaration(classDeclarationSyntax.Identifier)
.WithModifiers(classDeclarationSyntax.Modifiers)
.WithAttributeLists(classDeclarationSyntax.AttributeLists)
.WithHandlerIdentityConstraint(true)
.WithBaseList(BaseList(SingletonSeparatedList<BaseTypeSyntax>(SimpleBaseType(IdentifierName(classDeclarationSyntax.Identifier.Text)))))
.AddMembers(
ConstructorDeclaration(classDeclarationSyntax.Identifier)
.WithModifiers(TokenList(Token(SyntaxKind.ProtectedKeyword)))
.WithParameterList(
ParameterList(
SeparatedList(
new[] {
Parameter(Identifier("id")).WithType(IdentifierName("Guid")),
Parameter(Identifier("progressManager")).WithType(IdentifierName("IProgressManager"))
}
)
)
)
.WithInitializer(
ConstructorInitializer(
SyntaxKind.BaseConstructorInitializer,
ArgumentList(
SeparatedList(
new[] {
Argument(IdentifierName("id")),
Argument(
IdentifierName("progressManager")
)
}
)
)
)
)
.WithBody(Block()),
ConstructorDeclaration(classDeclarationSyntax.Identifier)
.WithModifiers(TokenList(Token(SyntaxKind.ProtectedKeyword)))
.WithParameterList(ParameterList(SingletonSeparatedList(Parameter(Identifier("progressManager")).WithType(IdentifierName("IProgressManager")))))
.WithInitializer(
ConstructorInitializer(
SyntaxKind.ThisConstructorInitializer,
ArgumentList(
SeparatedList(
new[] {
Argument(
InvocationExpression(
MemberAccessExpression(SyntaxKind.SimpleMemberAccessExpression, IdentifierName("Guid"), IdentifierName("NewGuid"))
)
),
Argument(
IdentifierName("progressManager")
)
}
)
)
)
)
.WithBody(Block()),
MethodDeclaration(PredefinedType(Token(SyntaxKind.VoidKeyword)), Identifier("Handle"))
.WithModifiers(TokenList(Token(SyntaxKind.ProtectedKeyword), Token(SyntaxKind.SealedKeyword), Token(SyntaxKind.OverrideKeyword)))
.WithParameterList(
ParameterList(
SeparatedList(
new[] {
Parameter(Identifier("request")).WithType(item.Request.Syntax),
Parameter(Identifier("results"))
.WithType(
GenericName(Identifier("IObserver"))
.WithTypeArgumentList(
TypeArgumentList(
SingletonSeparatedList<TypeSyntax>(
GenericName(Identifier("IEnumerable"))
.WithTypeArgumentList(TypeArgumentList(SingletonSeparatedList(partialItems.Syntax)))
)
)
)
),
Parameter(Identifier("cancellationToken")).WithType(IdentifierName("CancellationToken"))
}
)
)
)
.WithExpressionBody(
ArrowExpressionClause(
InvocationExpression(IdentifierName("Handle"))
.WithArgumentList(
ArgumentList(
SeparatedList(
new[] {
Argument(IdentifierName("request")),
Argument(
ObjectCreationExpression(
QualifiedName(
IdentifierName("LanguageProtocolDelegatingHandlers"),
GenericName(
Identifier("TypedPartialObserver")
)
.WithTypeArgumentList(
TypeArgumentList(
SeparatedList(
new[] {
GenericName(Identifier(resolver.Response.Symbol.Name))
.WithTypeArgumentList(
TypeArgumentList(
SingletonSeparatedList<TypeSyntax>(
IdentifierName("T")
)
)
),
partialItems.Syntax
}
)
)
)
)
)
.WithArgumentList(
ArgumentList(
SeparatedList(
new[] {
Argument(
IdentifierName("results")
),
Argument(
MemberAccessExpression(
SyntaxKind.SimpleMemberAccessExpression,
partialItems.Syntax,
IdentifierName("From")
)
)
}
)
)
)
),
Argument(IdentifierName("cancellationToken"))
}
)
)
)
)
)
.WithSemicolonToken(Token(SyntaxKind.SemicolonToken)),
MethodDeclaration(
GenericName(Identifier("Task"))
.WithTypeArgumentList(
TypeArgumentList(
SingletonSeparatedList(
resolver.Response.Syntax
)
)
),
Identifier("Handle")
)
.WithModifiers(
TokenList(Token(SyntaxKind.PublicKeyword), Token(SyntaxKind.SealedKeyword), Token(SyntaxKind.OverrideKeyword), Token(SyntaxKind.AsyncKeyword))
)
.WithParameterList(
ParameterList(
SeparatedList(
new[] {
Parameter(Identifier("request")).WithType(resolver.Request.Syntax),
Parameter(Identifier("cancellationToken")).WithType(IdentifierName("CancellationToken"))
}
)
)
)
.WithBody(
Block(
LocalDeclarationStatement(
VariableDeclaration(IdentifierName("var"))
.WithVariables(
SingletonSeparatedList(
VariableDeclarator(Identifier("response"))
.WithInitializer(
EqualsValueClause(
AwaitExpression(
InvocationExpression(
MemberAccessExpression(
SyntaxKind.SimpleMemberAccessExpression,
InvocationExpression(
IdentifierName("HandleResolve")
)
.WithArgumentList(
ArgumentList(
SeparatedList(
new[] {
Argument(IdentifierName("request")),
Argument(
IdentifierName("cancellationToken")
)
}
)
)
),
IdentifierName("ConfigureAwait")
)
)
.WithArgumentList(
ArgumentList(
SingletonSeparatedList(Argument(LiteralExpression(SyntaxKind.FalseLiteralExpression)))
)
)
)
)
)
)
)
),
ReturnStatement(IdentifierName("response"))
)
),
MethodDeclaration(
PredefinedType(Token(SyntaxKind.VoidKeyword)),
Identifier("Handle")
)
.WithModifiers(TokenList(Token(SyntaxKind.ProtectedKeyword), Token(SyntaxKind.AbstractKeyword)))
.WithParameterList(
ParameterList(
SeparatedList(
new[] {
Parameter(Identifier("request")).WithType(item.Request.Syntax),
Parameter(Identifier("results"))
.WithType(
GenericName(Identifier("IObserver"))
.WithTypeArgumentList(
TypeArgumentList(
SingletonSeparatedList<TypeSyntax>(
GenericName(Identifier("IEnumerable"))
.WithTypeArgumentList(
TypeArgumentList(
SingletonSeparatedList<TypeSyntax>(
GenericName(Identifier(resolver.Request.Symbol.Name))
.WithTypeArgumentList(
TypeArgumentList(
SingletonSeparatedList<TypeSyntax>(
IdentifierName("T")
)
)
)
)
)
)
)
)
)
),
Parameter(Identifier("cancellationToken")).WithType(IdentifierName("CancellationToken"))
}
)
)
)
.WithSemicolonToken(Token(SyntaxKind.SemicolonToken)),
MethodDeclaration(
GenericName(Identifier("Task"))
.WithTypeArgumentList(
TypeArgumentList(
SingletonSeparatedList<TypeSyntax>(
GenericName(Identifier(resolver.Request.Symbol.Name))
.WithTypeArgumentList(
TypeArgumentList(
SingletonSeparatedList<TypeSyntax>(
IdentifierName("T")
)
)
)
)
)
),
Identifier("HandleResolve")
)
.WithModifiers(TokenList(Token(SyntaxKind.ProtectedKeyword), Token(SyntaxKind.AbstractKeyword)))
.WithParameterList(
ParameterList(
SeparatedList(
new[] {
Parameter(Identifier("request"))
.WithType(
GenericName(Identifier(resolver.Request.Symbol.Name))
.WithTypeArgumentList(
TypeArgumentList(
SingletonSeparatedList<TypeSyntax>(
IdentifierName("T")
)
)
)
),
Parameter(Identifier("cancellationToken")).WithType(IdentifierName("CancellationToken"))
}
)
)
)
.WithSemicolonToken(Token(SyntaxKind.SemicolonToken))
);
}
private static TypeDeclarationSyntax GenerateTypedHandler(
TypeDeclarationSyntax classDeclarationSyntax,
RequestItem item,
RequestItem resolver
)
{
TypeSyntax responseType = GenericName(Identifier(item.Response.Symbol.Name))
.WithTypeArgumentList(TypeArgumentList(SingletonSeparatedList<TypeSyntax>(IdentifierName("T"))));
// Special case... because the spec is awesome
if (item.Response.Symbol.Name == "CommandOrCodeActionContainer")
{
responseType = GenericName(Identifier("CodeActionContainer"))
.WithTypeArgumentList(TypeArgumentList(SingletonSeparatedList<TypeSyntax>(IdentifierName("T"))));
}
return ClassDeclaration(classDeclarationSyntax.Identifier)
.WithModifiers(classDeclarationSyntax.Modifiers)
.WithAttributeLists(classDeclarationSyntax.AttributeLists)
.WithHandlerIdentityConstraint(true)
.WithBaseList(BaseList(SingletonSeparatedList<BaseTypeSyntax>(SimpleBaseType(IdentifierName(classDeclarationSyntax.Identifier.Text)))))
.AddMembers(
ConstructorDeclaration(classDeclarationSyntax.Identifier)
.WithModifiers(TokenList(Token(SyntaxKind.ProtectedKeyword)))
.WithParameterList(ParameterList(SingletonSeparatedList(Parameter(Identifier("id")).WithType(IdentifierName("Guid")))))
.WithInitializer(
ConstructorInitializer(
SyntaxKind.BaseConstructorInitializer,
ArgumentList(SingletonSeparatedList(Argument(IdentifierName("id"))))
)
)
.WithBody(Block()),
ConstructorDeclaration(classDeclarationSyntax.Identifier)
.WithModifiers(TokenList(Token(SyntaxKind.ProtectedKeyword)))
.WithInitializer(
ConstructorInitializer(
SyntaxKind.ThisConstructorInitializer,
ArgumentList(
SingletonSeparatedList(
Argument(
InvocationExpression(
MemberAccessExpression(SyntaxKind.SimpleMemberAccessExpression, IdentifierName("Guid"), IdentifierName("NewGuid"))
)
)
)
)
)
)
.WithBody(Block()),
MethodDeclaration(
GenericName(Identifier("Task")).WithTypeArgumentList(TypeArgumentList(SingletonSeparatedList(item.Response.Syntax))),
Identifier("Handle")
)
.WithModifiers(
TokenList(
Token(SyntaxKind.PublicKeyword), Token(SyntaxKind.SealedKeyword), Token(SyntaxKind.OverrideKeyword), Token(SyntaxKind.AsyncKeyword)
)
)
.WithParameterList(
ParameterList(
SeparatedList(
new[] {
Parameter(Identifier("request")).WithType(item.Request.Syntax),
Parameter(Identifier("cancellationToken")).WithType(IdentifierName("CancellationToken"))
}
)
)
)
.WithExpressionBody(
ArrowExpressionClause(
AwaitExpression(
InvocationExpression(
MemberAccessExpression(
SyntaxKind.SimpleMemberAccessExpression,
InvocationExpression(IdentifierName("HandleParams"))
.WithArgumentList(
ArgumentList(
SeparatedList(
new[] {
Argument(IdentifierName("request")),
Argument(IdentifierName("cancellationToken"))
}
)
)
),
IdentifierName("ConfigureAwait")
)
)
.WithArgumentList(
ArgumentList(
SingletonSeparatedList(
Argument(
LiteralExpression(
SyntaxKind.FalseLiteralExpression
)
)
)
)
)
)