protected override Expression VisitHelperExpression(HelperExpression hex)
{
var helperName = hex.HelperName;
var bindingContext = ExpressionShortcuts.Arg <BindingContext>(CompilationContext.BindingContext);
var textWriter = bindingContext.Property(o => o.TextWriter);
var arguments = hex.Arguments.Select(o => FunctionBuilder.Reduce(o, CompilationContext));
var args = ExpressionShortcuts.Array <object>(arguments);
var configuration = CompilationContext.Configuration;
if (configuration.Helpers.TryGetValue(helperName, out var helper))
{
return(ExpressionShortcuts.Call(() => helper(textWriter, bindingContext, args)));
}
if (configuration.ReturnHelpers.TryGetValue(helperName, out var returnHelper))
{
return(ExpressionShortcuts.Call(() =>
CaptureResult(textWriter, ExpressionShortcuts.Call(() => returnHelper(bindingContext, args)))
));
}
var pureHelperName = helperName.Substring(1);
foreach (var resolver in configuration.HelperResolvers)
{
if (resolver.TryResolveReturnHelper(pureHelperName, typeof(object), out var resolvedHelper))
{
return(ExpressionShortcuts.Call(() =>
CaptureResult(textWriter, ExpressionShortcuts.Call(() => resolvedHelper(bindingContext, args)))
));
}
}
return(ExpressionShortcuts.Call(() =>
CaptureResult(textWriter, ExpressionShortcuts.Call(() =>
LateBindHelperExpression(bindingContext, helperName, 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)))
);
})));
}
