protected override Expression VisitBlockHelperExpression(BlockHelperExpression bhex)
{
var fb = new FunctionBuilder(CompilationContext.Configuration);
var body = fb.Compile(((BlockExpression)bhex.Body).Expressions, CompilationContext.BindingContext);
var inversion = fb.Compile(((BlockExpression)bhex.Inversion).Expressions, CompilationContext.BindingContext);
var helper = CompilationContext.Configuration.BlockHelpers[bhex.HelperName.Replace("#", "")];
var arguments = new Expression[]
{
Expression.Property(
CompilationContext.BindingContext,
typeof(BindingContext).GetProperty("TextWriter")),
Expression.New(
typeof(HelperOptions).GetConstructors(BindingFlags.Instance | BindingFlags.NonPublic)[0],
body,
inversion),
Expression.Property(
CompilationContext.BindingContext,
typeof(BindingContext).GetProperty("Value")),
Expression.NewArrayInit(typeof(object), bhex.Arguments)
};
if (helper.Target != null)
{
return(Expression.Call(
Expression.Constant(helper.Target),
helper.Method,
arguments));
}
else
{
return(Expression.Call(
helper.Method,
arguments));
}
}
protected override Expression VisitBlockHelperExpression(BlockHelperExpression bhex)
{
var fb = new FunctionBuilder(CompilationContext.Configuration);
var body = fb.Compile(((BlockExpression)bhex.Body).Expressions, CompilationContext.BindingContext);
var inversion = fb.Compile(((BlockExpression)bhex.Inversion).Expressions, CompilationContext.BindingContext);
var helper = CompilationContext.Configuration.BlockHelpers[bhex.HelperName.Replace("#", "")];
var arguments = new Expression[]
{
Expression.Property(
CompilationContext.BindingContext,
typeof(BindingContext).GetProperty("TextWriter")),
Expression.New(
typeof(HelperOptions).GetConstructors(BindingFlags.Instance | BindingFlags.NonPublic)[0],
body,
inversion),
Expression.Property(
CompilationContext.BindingContext,
typeof(BindingContext).GetProperty("Value")),
Expression.NewArrayInit(typeof(object), bhex.Arguments)
};
if (helper.Target != null)
{
return Expression.Call(
Expression.Constant(helper.Target),
helper.Method,
arguments);
}
else
{
return Expression.Call(
helper.Method,
arguments);
}
}
protected override Expression VisitBlockHelperExpression(BlockHelperExpression bhex)
{
return HandlebarsExpression.BlockHelper(
bhex.HelperName,
bhex.Arguments.Select(arg => Visit(arg)),
Visit(bhex.Body),
Visit(bhex.Inversion));
}
protected override Expression VisitBlockHelperExpression(BlockHelperExpression bhex)
{
return(HandlebarsExpression.BlockHelper(
bhex.HelperName,
bhex.Arguments.Select(arg => Visit(arg)),
Visit(bhex.Body),
Visit(bhex.Inversion)));
}
protected override Expression VisitBlockHelperExpression(BlockHelperExpression bhex)
{
var isInlinePartial = bhex.HelperName == "#*inline";
var fb = new FunctionBuilder(CompilationContext.Configuration);
var bindingContext = isInlinePartial ? (Expression)CompilationContext.BindingContext :
Expression.Property(
CompilationContext.BindingContext,
typeof(BindingContext).GetProperty("Value"));
var body = fb.Compile(((BlockExpression)bhex.Body).Expressions, CompilationContext.BindingContext);
var inversion = fb.Compile(((BlockExpression)bhex.Inversion).Expressions, CompilationContext.BindingContext);
var helper = CompilationContext.Configuration.BlockHelpers[bhex.HelperName.Replace("#", "")];
var arguments = new Expression[]
{
Expression.Property(
CompilationContext.BindingContext,
typeof(BindingContext).GetProperty("TextWriter")),
Expression.Property(
CompilationContext.BindingContext,
typeof(BindingContext).GetProperty("Root")),
Expression.New(
typeof(HelperOptions).GetConstructors(BindingFlags.Instance | BindingFlags.NonPublic)[0],
body,
inversion),
//this next arg is usually data, like { first: "Marc" }
//but for inline partials this is the complete BindingContext.
bindingContext,
Expression.NewArrayInit(typeof(object), bhex.Arguments)
};
if (helper.Target != null)
{
return(Expression.Call(
Expression.Constant(helper.Target),
#if netstandard
helper.GetMethodInfo(),
#else
helper.Method,
#endif
arguments));
}
else
{
return(Expression.Call(
#if netstandard
helper.GetMethodInfo(),
#else
helper.Method,
#endif
arguments));
}
}
protected virtual Expression VisitBlockHelperExpression(BlockHelperExpression bhex)
{
var arguments = VisitExpressionList(bhex.Arguments);
// Don't visit Body/Inversion - they will be compiled separately
if (arguments != bhex.Arguments)
{
return(HandlebarsExpression.BlockHelper(bhex.HelperName, arguments, bhex.BlockParams, bhex.Body, bhex.Inversion, bhex.IsRaw));
}
return(bhex);
}
protected virtual Expression VisitBlockHelperExpression(BlockHelperExpression bhex)
{
return bhex;
}
protected override Expression VisitBlockHelperExpression(BlockHelperExpression bhex) => bhex;
protected virtual Expression VisitBlockHelperExpression(BlockHelperExpression bhex)
{
return(bhex);
}
protected override Expression VisitBlockHelperExpression(BlockHelperExpression bhex)
{
return(bhex);
}
protected override Expression VisitBlockHelperExpression(BlockHelperExpression bhex)
{
var isInlinePartial = bhex.HelperName == "#*inline";
var pathInfo = PathInfoStore.Current.GetOrAdd(bhex.HelperName);
var bindingContext = CompilationContext.Args.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 args = FunctionBinderHelpers.CreateArguments(bhex.Arguments, CompilationContext);
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(pathInfo, descriptor));
}
var helperResolvers = CompilationContext.Configuration.HelperResolvers;
for (var index = 0; index < helperResolvers.Count; index++)
{
var resolver = helperResolvers[index];
if (!resolver.TryResolveBlockHelper(pathInfo, out var resolvedDescriptor))
{
continue;
}
descriptor = new Ref <IHelperDescriptor <BlockHelperOptions> >(resolvedDescriptor);
blockHelpers.AddOrReplace(pathInfo, descriptor);
return(BindByRef(pathInfo, descriptor));
}
var lateBindBlockHelperDescriptor = new LateBindBlockHelperDescriptor(pathInfo);
var lateBindBlockHelperRef = new Ref <IHelperDescriptor <BlockHelperOptions> >(lateBindBlockHelperDescriptor);
blockHelpers.AddOrReplace(pathInfo, lateBindBlockHelperRef);
return(BindByRef(pathInfo, lateBindBlockHelperRef));
ExpressionContainer <ChainSegment[]> CreateBlockParams()
{
var parameters = bhex.BlockParams?.BlockParam?.Parameters;
parameters ??= ArrayEx.Empty <ChainSegment>();
return(Arg(parameters));
}
TemplateDelegate Compile(Expression expression)
{
var blockExpression = (BlockExpression)expression;
return(FunctionBuilder.Compile(blockExpression.Expressions, new CompilationContext(CompilationContext)));
}
Expression BindByRef(PathInfo name, Ref <IHelperDescriptor <BlockHelperOptions> > helperBox)
{
var writer = CompilationContext.Args.EncodedWriter;
var helperOptions = direction switch
{
BlockHelperDirection.Direct => New(() => new BlockHelperOptions(name, direct, inverse, blockParams, bindingContext)),
BlockHelperDirection.Inverse => New(() => new BlockHelperOptions(name, inverse, direct, blockParams, bindingContext)),
_ => throw new HandlebarsCompilerException("Helper referenced with unknown prefix", readerContext)
};
var callContext = New(() => new Context(bindingContext, context));
return(Call(() => helperBox.Value.Invoke(writer, helperOptions, callContext, args)));
}
}
}
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)
});
