protected override Expression VisitIteratorExpression(IteratorExpression iex) { var context = Arg <BindingContext>(CompilationContext.BindingContext); var template = FunctionBuilder.CompileCore(new[] { iex.Template }, CompilationContext.Configuration); var ifEmpty = FunctionBuilder.CompileCore(new[] { iex.IfEmpty }, CompilationContext.Configuration); if (iex.Sequence is PathExpression pathExpression) { pathExpression.Context = PathExpression.ResolutionContext.Parameter; } var compiledSequence = Arg <object>(FunctionBuilder.Reduce(iex.Sequence, CompilationContext)); var blockParamsValues = CreateBlockParams(); return(Call(() => Iterator.Iterate(context, blockParamsValues, compiledSequence, template, ifEmpty) )); ExpressionContainer <ChainSegment[]> CreateBlockParams() { var parameters = iex.BlockParams?.BlockParam?.Parameters; if (parameters == null) { parameters = ArrayEx.Empty <ChainSegment>(); } return(Arg(parameters)); } }
protected override Expression VisitIteratorExpression(IteratorExpression iex) { var context = ExpressionShortcuts.Arg <BindingContext>(CompilationContext.BindingContext); var sequence = ExpressionShortcuts.Var <object>("sequence"); var template = FunctionBuilder.CompileCore(new[] { iex.Template }, CompilationContext.Configuration); var ifEmpty = FunctionBuilder.CompileCore(new[] { iex.IfEmpty }, CompilationContext.Configuration); var compiledSequence = ExpressionShortcuts.Arg <object>(FunctionBuilder.Reduce(iex.Sequence, CompilationContext)); var blockParams = ExpressionShortcuts.Arg <BlockParam>(iex.BlockParams); var blockParamsProvider = ExpressionShortcuts.Call(() => BlockParamsValueProvider.Create(context, blockParams)); var blockParamsProviderVar = ExpressionShortcuts.Var <BlockParamsValueProvider>(); return(ExpressionShortcuts.Block() .Parameter(sequence, compiledSequence) .Parameter(blockParamsProviderVar, blockParamsProvider) .Line(blockParamsProviderVar.Using((self, builder) => { builder .Line(context.Call(o => o.RegisterValueProvider((IValueProvider)self))) .Line(ExpressionShortcuts.Try() .Body(ExpressionShortcuts.Call(() => Iterator.Iterate(context, self, sequence, template, ifEmpty) )) .Finally(context.Call(o => o.UnregisterValueProvider((IValueProvider)self))) ); }))); }
protected override Expression VisitPartialExpression(PartialExpression pex) { var bindingContext = ExpressionShortcuts.Arg <BindingContext>(CompilationContext.BindingContext); var partialBlockTemplate = pex.Fallback != null ? FunctionBuilder.CompileCore(new[] { pex.Fallback }, CompilationContext.Configuration) : null; if (pex.Argument != null || partialBlockTemplate != null) { var value = ExpressionShortcuts.Arg <object>(FunctionBuilder.Reduce(pex.Argument, CompilationContext)); var partialTemplate = ExpressionShortcuts.Arg(partialBlockTemplate); bindingContext = bindingContext.Call(o => o.CreateChildContext(value, partialTemplate)); } var partialName = ExpressionShortcuts.Cast <string>(pex.PartialName); var configuration = ExpressionShortcuts.Arg(CompilationContext.Configuration); return(ExpressionShortcuts.Call(() => InvokePartialWithFallback(partialName, bindingContext, (ICompiledHandlebarsConfiguration)configuration) )); }
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))) ); }))); }
protected override Expression VisitBlockHelperExpression(BlockHelperExpression bhex) { var isInlinePartial = bhex.HelperName == "#*inline"; var pathInfo = CompilationContext.Configuration.PathInfoStore.GetOrAdd(bhex.HelperName); var bindingContext = Arg <BindingContext>(CompilationContext.BindingContext); var context = isInlinePartial ? bindingContext.As <object>() : bindingContext.Property(o => o.Value); var readerContext = bhex.Context; var direct = Compile(bhex.Body); var inverse = Compile(bhex.Inversion); var arguments = CreateArguments(); var helperName = pathInfo.TrimmedPath; var direction = bhex.IsRaw || pathInfo.IsBlockHelper ? BlockHelperDirection.Direct : BlockHelperDirection.Inverse; var blockParams = CreateBlockParams(); var blockHelpers = CompilationContext.Configuration.BlockHelpers; if (blockHelpers.TryGetValue(pathInfo, out var descriptor)) { return(BindByRef(descriptor)); } var helperResolvers = CompilationContext.Configuration.HelperResolvers; for (var index = 0; index < helperResolvers.Count; index++) { var resolver = helperResolvers[index]; if (!resolver.TryResolveBlockHelper(helperName, out var resolvedDescriptor)) { continue; } return(Bind(resolvedDescriptor)); } var lateBindBlockHelperDescriptor = new LateBindBlockHelperDescriptor(pathInfo, CompilationContext.Configuration); var lateBindBlockHelperRef = new StrongBox <BlockHelperDescriptorBase>(lateBindBlockHelperDescriptor); blockHelpers.Add(pathInfo, lateBindBlockHelperRef); return(BindByRef(lateBindBlockHelperRef)); ExpressionContainer <ChainSegment[]> CreateBlockParams() { var parameters = bhex.BlockParams?.BlockParam?.Parameters; if (parameters == null) { parameters = ArrayEx.Empty <ChainSegment>(); } return(Arg(parameters)); } ExpressionContainer <object[]> CreateArguments() { var args = bhex.Arguments .ApplyOn((PathExpression pex) => pex.Context = PathExpression.ResolutionContext.Parameter) .Select(o => FunctionBuilder.Reduce(o, CompilationContext)); return(Array <object>(args)); } Action <BindingContext, TextWriter, object> Compile(Expression expression) { var blockExpression = (BlockExpression)expression; return(FunctionBuilder.CompileCore(blockExpression.Expressions, CompilationContext.Configuration)); } Expression BindByRef(StrongBox <BlockHelperDescriptorBase> value) { return(direction switch { BlockHelperDirection.Direct => Call(() => BlockHelperCallBindingByRef(bindingContext, context, blockParams, direct, inverse, arguments, value)), BlockHelperDirection.Inverse => Call(() => BlockHelperCallBindingByRef(bindingContext, context, blockParams, inverse, direct, arguments, value)), _ => throw new HandlebarsCompilerException("Helper referenced with unknown prefix", readerContext) });