private Expression HandleInvocationExpression(InvocationExpression invocation) { if (invocation.Type != typeof(void)) { return(invocation.Update(invocation.Expression, ReplaceValuesOf <TextWriter>(invocation.Arguments, ExpressionShortcuts.Null <TextWriter>()).Select(Visit) )); } var context = ExpressionShortcuts.Var <BindingContext>(); var writer = ExpressionShortcuts.Var <TextWriter>(); invocation = invocation.Update(ExpressionUtils.ReplaceParameters(invocation.Expression, context), ExpressionUtils.ReplaceParameters( ReplaceValuesOf <TextWriter>(invocation.Arguments, writer), new Expression[] { context } ).Select(Visit) ); var formatProvider = ExpressionShortcuts.Arg(CompilationContext.Configuration.FormatProvider); var block = ExpressionShortcuts.Block() .Parameter(writer, ExpressionShortcuts.New(() => new PolledStringWriter((IFormatProvider)formatProvider))) .Line(writer.Using((o, body) => body.Line(invocation) .Line(o.Call(x => (object)x.ToString())) )); var continuation = _expressionCompiler.Compile(Expression.Lambda <Func <BindingContext, object> >(block, (ParameterExpression)context)); return(ExpressionShortcuts.Arg <object>(Expression.Invoke(Expression.Constant(continuation), CompilationContext.BindingContext))); }
protected override Expression VisitBlockHelperExpression(BlockHelperExpression bhex) { var isInlinePartial = bhex.HelperName == "#*inline"; var context = ExpressionShortcuts.Arg <BindingContext>(CompilationContext.BindingContext); var bindingContext = isInlinePartial ? context.Cast <object>() : context.Property(o => o.Value); var readerContext = ExpressionShortcuts.Arg(bhex.Context); var body = FunctionBuilder.CompileCore(((BlockExpression)bhex.Body).Expressions, CompilationContext.Configuration); var inverse = FunctionBuilder.CompileCore(((BlockExpression)bhex.Inversion).Expressions, CompilationContext.Configuration); var helperName = bhex.HelperName.TrimStart('#', '^'); var textWriter = context.Property(o => o.TextWriter); var arguments = ExpressionShortcuts.Array <object>(bhex.Arguments.Select(o => FunctionBuilder.Reduce(o, CompilationContext))); var configuration = ExpressionShortcuts.Arg(CompilationContext.Configuration); var reducerNew = ExpressionShortcuts.New(() => new LambdaReducer(context, body, inverse)); var reducer = ExpressionShortcuts.Var <LambdaReducer>(); var blockParamsProvider = ExpressionShortcuts.Var <BlockParamsValueProvider>(); var blockParamsExpression = ExpressionShortcuts.Call( () => BlockParamsValueProvider.Create(context, ExpressionShortcuts.Arg <BlockParam>(bhex.BlockParams)) ); var helperOptions = ExpressionShortcuts.New( () => new HelperOptions( reducer.Property(o => o.Direct), reducer.Property(o => o.Inverse), blockParamsProvider, configuration) ); var blockHelpers = CompilationContext.Configuration.BlockHelpers; if (blockHelpers.TryGetValue(helperName, out var helper)) { return(ExpressionShortcuts.Block() .Parameter(reducer, reducerNew) .Parameter(blockParamsProvider, blockParamsExpression) .Line(blockParamsProvider.Using((self, builder) => { builder .Line(context.Call(o => o.RegisterValueProvider((IValueProvider)self))) .Line(ExpressionShortcuts.Try() .Body(ExpressionShortcuts.Call( () => helper(textWriter, helperOptions, bindingContext, arguments) )) .Finally(context.Call(o => o.UnregisterValueProvider((IValueProvider)self))) ); }))); } foreach (var resolver in CompilationContext.Configuration.HelperResolvers) { if (resolver.TryResolveBlockHelper(helperName, out helper)) { return(ExpressionShortcuts.Block() .Parameter(reducer, reducerNew) .Parameter(blockParamsProvider, blockParamsExpression) .Line(blockParamsProvider.Using((self, builder) => { builder .Line(context.Call(o => o.RegisterValueProvider((IValueProvider)self))) .Line(ExpressionShortcuts.Try() .Body(ExpressionShortcuts.Call( () => helper(textWriter, helperOptions, bindingContext, arguments) )) .Finally(context.Call(o => o.UnregisterValueProvider((IValueProvider)self))) ); }))); } } var helperPrefix = bhex.HelperName[0]; return(ExpressionShortcuts.Block() .Parameter(reducer, reducerNew) .Parameter(blockParamsProvider, blockParamsExpression) .Line(blockParamsProvider.Using((self, builder) => { builder .Line(context.Call(o => o.RegisterValueProvider((IValueProvider)self))) .Line(ExpressionShortcuts.Try() .Body(ExpressionShortcuts.Call( () => LateBoundCall( helperName, helperPrefix, context, (IReaderContext)readerContext, textWriter, helperOptions, body, inverse, bindingContext, self, arguments ) )) .Finally(context.Call(o => o.UnregisterValueProvider((IValueProvider)self))) ); }))); }