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 iteratorBindingContext = Expression.Variable(typeof(BindingContext), "context");
return(Expression.Block(
new ParameterExpression[]
{
iteratorBindingContext
},
Expression.IfThenElse(
Expression.TypeIs(iex.Sequence, typeof(IEnumerable)),
Expression.IfThenElse(
#if netstandard
Expression.Call(new Func <object, bool>(IsNonListDynamic).GetMethodInfo(), new[] { iex.Sequence }),
#else
Expression.Call(new Func <object, bool>(IsNonListDynamic).Method, new[] { iex.Sequence }),
#endif
GetDynamicIterator(iteratorBindingContext, iex),
Expression.IfThenElse(
#if netstandard
Expression.Call(new Func <object, bool>(IsGenericDictionary).GetMethodInfo(), new[] { iex.Sequence }),
#else
Expression.Call(new Func <object, bool>(IsGenericDictionary).Method, new[] { iex.Sequence }),
#endif
GetDictionaryIterator(iteratorBindingContext, iex),
GetEnumerableIterator(iteratorBindingContext, iex))),
GetObjectIterator(iteratorBindingContext, iex))
));
}
private Expression GetEnumerableIterator(Expression contextParameter, IteratorExpression iex)
{
var fb = new FunctionBuilder(CompilationContext.Configuration);
return Expression.Block(
Expression.Assign(contextParameter,
Expression.New(
#if netstandard
typeof(IteratorBindingContext).GetTypeInfo().GetConstructor(new[] { typeof(BindingContext) }),
#else
typeof(IteratorBindingContext).GetConstructor(new[] { typeof(BindingContext) }),
#endif
new Expression[] { CompilationContext.BindingContext })),
Expression.Call(
#if netstandard
new Action<IteratorBindingContext, IEnumerable, Action<TextWriter, object>, Action<TextWriter, object>>(Iterate).GetMethodInfo(),
#else
new Action<IteratorBindingContext, IEnumerable, Action<TextWriter, object>, Action<TextWriter, object>>(Iterate).Method,
#endif
new Expression[]
{
Expression.Convert(contextParameter, typeof(IteratorBindingContext)),
Expression.Convert(iex.Sequence, typeof(IEnumerable)),
fb.Compile(new [] { iex.Template }, contextParameter),
fb.Compile(new [] { iex.IfEmpty }, CompilationContext.BindingContext)
}));
}
protected override Expression VisitIteratorExpression(IteratorExpression iex)
{
var iteratorBindingContext = Expression.Variable(typeof(BindingContext), "context");
return Expression.Block(
new ParameterExpression[]
{
iteratorBindingContext
},
Expression.IfThenElse(
Expression.TypeIs(iex.Sequence, typeof(IEnumerable)),
Expression.IfThenElse(
#if netstandard
Expression.Call(new Func<object, bool>(IsNonListDynamic).GetMethodInfo(), new[] { iex.Sequence }),
#else
Expression.Call(new Func<object, bool>(IsNonListDynamic).Method, new[] { iex.Sequence }),
#endif
GetDynamicIterator(iteratorBindingContext, iex),
Expression.IfThenElse(
#if netstandard
Expression.Call(new Func<object, bool>(IsGenericDictionary).GetMethodInfo(), new[] { iex.Sequence }),
#else
Expression.Call(new Func<object, bool>(IsGenericDictionary).Method, new[] { iex.Sequence }),
#endif
GetDictionaryIterator(iteratorBindingContext, iex),
GetEnumerableIterator(iteratorBindingContext, iex))),
GetObjectIterator(iteratorBindingContext, iex))
);
}
private Expression GetEnumerableIterator(Expression contextParameter, IteratorExpression iex)
{
var fb = new FunctionBuilder(CompilationContext.Configuration);
return(Expression.Block(
Expression.Assign(contextParameter,
Expression.New(
#if netstandard
typeof(IteratorBindingContext).GetTypeInfo().GetConstructor(new[] { typeof(BindingContext) }),
#else
typeof(IteratorBindingContext).GetConstructor(new[] { typeof(BindingContext) }),
#endif
new Expression[] { CompilationContext.BindingContext })),
Expression.Call(
#if netstandard
new Action <IteratorBindingContext, IEnumerable, Action <TextWriter, object>, Action <TextWriter, object> >(Iterate).GetMethodInfo(),
#else
new Action <IteratorBindingContext, IEnumerable, Action <TextWriter, object>, Action <TextWriter, object> >(Iterate).Method,
#endif
new Expression[]
{
Expression.Convert(contextParameter, typeof(IteratorBindingContext)),
Expression.Convert(iex.Sequence, typeof(IEnumerable)),
fb.Compile(new [] { iex.Template }, contextParameter),
fb.Compile(new [] { iex.IfEmpty }, CompilationContext.BindingContext)
})));
}
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 virtual Expression VisitIteratorExpression(IteratorExpression iex)
{
Expression sequence = Visit(iex.Sequence);
// Don't visit Template/IfEmpty - they will be compiled separately
if (sequence != iex.Sequence)
{
return(HandlebarsExpression.Iterator(sequence, iex.BlockParams, iex.Template, iex.IfEmpty));
}
return(iex);
}
private Expression GetObjectIterator(Expression contextParameter, IteratorExpression iex)
{
var fb = new FunctionBuilder(CompilationContext.Configuration);
return(Expression.Block(
Expression.Assign(contextParameter,
Expression.New(
typeof(ObjectEnumeratorBindingContext).GetConstructor(new[] { typeof(BindingContext) }),
new Expression[] { CompilationContext.BindingContext })),
Expression.Call(
new Action <ObjectEnumeratorBindingContext, object, Action <TextWriter, object>, Action <TextWriter, object> >(Iterate).Method,
new Expression[]
{
Expression.Convert(contextParameter, typeof(ObjectEnumeratorBindingContext)),
iex.Sequence,
fb.Compile(new [] { iex.Template }, contextParameter),
fb.Compile(new [] { iex.IfEmpty }, CompilationContext.BindingContext)
})));
}
protected override Expression VisitIteratorExpression(IteratorExpression iex)
{
var context = CompilationContext.Args.BindingContext;
var writer = CompilationContext.Args.EncodedWriter;
var template = FunctionBuilder.Compile(new[] { iex.Template }, new CompilationContext(CompilationContext));
var ifEmpty = FunctionBuilder.Compile(new[] { iex.IfEmpty }, new CompilationContext(CompilationContext));
if (iex.Sequence is PathExpression pathExpression)
{
pathExpression.Context = PathExpression.ResolutionContext.Parameter;
}
var compiledSequence = Arg <object>(FunctionBuilder.Reduce(iex.Sequence, CompilationContext));
var blockParamsValues = CreateBlockParams();
return(iex.HelperName[0] switch
{
'#' => Call(() => Iterator.Iterate(context, writer, blockParamsValues, compiledSequence, template, ifEmpty)),
'^' => Call(() => Iterator.Iterate(context, writer, blockParamsValues, compiledSequence, ifEmpty, template)),
_ => throw new HandlebarsCompilerException($"Tried to convert {iex.HelperName} expression to iterator block", iex.Context)
});
protected virtual Expression VisitIteratorExpression(IteratorExpression iex)
{
return iex;
}
protected virtual Expression VisitIteratorExpression(IteratorExpression iex)
{
return(iex);
}
private Expression GetObjectIterator(Expression contextParameter, IteratorExpression iex)
{
var fb = new FunctionBuilder(CompilationContext.Configuration);
return Expression.Block(
Expression.Assign(contextParameter,
Expression.New(
typeof(ObjectEnumeratorBindingContext).GetConstructor(new[] { typeof(BindingContext) }),
new Expression[] { CompilationContext.BindingContext })),
Expression.Call(
new Action<ObjectEnumeratorBindingContext, object, Action<TextWriter, object>, Action<TextWriter, object>>(Iterate).Method,
new Expression[]
{
Expression.Convert(contextParameter, typeof(ObjectEnumeratorBindingContext)),
iex.Sequence,
fb.Compile(new [] { iex.Template }, contextParameter),
fb.Compile(new [] { iex.IfEmpty }, CompilationContext.BindingContext)
}));
}