public void BlockHelperWithBlockParams()
{
var handlebars = Handlebars.Create();
handlebars.RegisterHelper("myHelper", (writer, options, context, args) =>
{
using var frame = options.CreateFrame();
var blockParamsValues = new BlockParamsValues(frame, options.BlockParams);
blockParamsValues.CreateProperty(0, out var _0);
for (var index = 0; index < args.Length; index++)
{
var arg = args[index];
blockParamsValues[_0] = index;
frame.Value = arg;
options.Template(writer, frame);
}
});
var source = "Here are some things: {{#myHelper 'foo' 'bar' as |counter|}}{{counter}}:{{this}}\n{{/myHelper}}";
var template = handlebars.Compile(source);
var output = template(new { });
var expected = "Here are some things: 0:foo\n1:bar\n";
Assert.Equal(expected, output);
}
private static void IterateObjectWithStaticProperties(
BindingContext context,
EncodedTextWriter writer,
ChainSegment[] blockParamsVariables,
ObjectDescriptor descriptor,
object target,
IList <ChainSegment> properties,
Type targetType,
TemplateDelegate template,
TemplateDelegate ifEmpty)
{
using var innerContext = context.CreateFrame();
var iterator = new ObjectIteratorValues(innerContext);
var blockParams = new BlockParamsValues(innerContext, blockParamsVariables);
blockParams.CreateProperty(0, out var _0);
blockParams.CreateProperty(1, out var _1);
var count = properties.Count;
var accessor = new MemberAccessor(target, descriptor);
var iterationIndex = 0;
var lastIndex = count - 1;
object iteratorValue;
ChainSegment iteratorKey;
for (; iterationIndex < count; iterationIndex++)
{
iteratorKey = properties[iterationIndex];
iterator.Index = iterationIndex;
iterator.Key = iteratorKey;
if (iterationIndex == 1)
{
iterator.First = BoxedValues.False;
}
if (iterationIndex == lastIndex)
{
iterator.Last = BoxedValues.True;
}
iteratorValue = accessor[iteratorKey];
iterator.Value = iteratorValue;
innerContext.Value = iteratorValue;
blockParams[_0] = iteratorValue;
blockParams[_1] = iteratorKey;
template(writer, innerContext);
}
if (iterationIndex == 0)
{
innerContext.Value = context.Value;
ifEmpty(writer, innerContext);
}
}
private static void IterateObject(
BindingContext context,
EncodedTextWriter writer,
ObjectDescriptor descriptor,
ChainSegment[] blockParamsVariables,
object target,
IEnumerable properties,
Type targetType,
TemplateDelegate template,
TemplateDelegate ifEmpty)
{
using var innerContext = context.CreateFrame();
var iterator = new ObjectIteratorValues(innerContext);
var blockParams = new BlockParamsValues(innerContext, blockParamsVariables);
blockParams.CreateProperty(0, out var _0);
blockParams.CreateProperty(1, out var _1);
var accessor = new MemberAccessor(target, descriptor);
var enumerable = new ExtendedEnumerator <object>(properties.GetEnumerator());
var enumerated = false;
object iteratorValue;
ChainSegment iteratorKey;
while (enumerable.MoveNext())
{
enumerated = true;
var enumerableValue = enumerable.Current;
iteratorKey = ChainSegment.Create(enumerableValue.Value);
iterator.Key = iteratorKey;
iterator.Index = enumerableValue.Index;
if (enumerableValue.Index == 1)
{
iterator.First = BoxedValues.False;
}
if (enumerableValue.IsLast)
{
iterator.Last = BoxedValues.True;
}
iteratorValue = accessor[iteratorKey];
iterator.Value = iteratorValue;
innerContext.Value = iteratorValue;
blockParams[_0] = iteratorValue;
blockParams[_1] = iteratorKey;
template(writer, innerContext);
}
if (!enumerated)
{
innerContext.Value = context.Value;
ifEmpty(writer, innerContext);
}
}
private static void IterateEnumerable(
BindingContext context,
EncodedTextWriter writer,
ChainSegment[] blockParamsVariables,
IEnumerable target,
TemplateDelegate template,
TemplateDelegate ifEmpty)
{
using var innerContext = context.CreateFrame();
var iterator = new IteratorValues(innerContext);
var blockParams = new BlockParamsValues(innerContext, blockParamsVariables);
blockParams.CreateProperty(0, out var _0);
blockParams.CreateProperty(1, out var _1);
var enumerator = new ExtendedEnumerator <object>(target.GetEnumerator());
var enumerated = false;
object boxedIndex;
object iteratorValue;
while (enumerator.MoveNext())
{
enumerated = true;
var enumerableValue = enumerator.Current;
if (enumerableValue.Index == 1)
{
iterator.First = BoxedValues.False;
}
if (enumerableValue.IsLast)
{
iterator.Last = BoxedValues.True;
}
boxedIndex = enumerableValue.Index;
iteratorValue = enumerableValue.Value;
iterator.Value = iteratorValue;
iterator.Index = boxedIndex;
blockParams[_0] = iteratorValue;
blockParams[_1] = boxedIndex;
innerContext.Value = iteratorValue;
template(writer, innerContext);
}
if (!enumerated)
{
innerContext.Value = context.Value;
ifEmpty(writer, innerContext);
}
}
private static void IterateList(
BindingContext context,
EncodedTextWriter writer,
ChainSegment[] blockParamsVariables,
IList target,
TemplateDelegate template,
TemplateDelegate ifEmpty)
{
using var innerContext = context.CreateFrame();
var iterator = new IteratorValues(innerContext);
var blockParams = new BlockParamsValues(innerContext, blockParamsVariables);
blockParams.CreateProperty(0, out var _0);
blockParams.CreateProperty(1, out var _1);
var count = target.Count;
object boxedIndex;
object iteratorValue;
var iterationIndex = 0;
var lastIndex = count - 1;
for (; iterationIndex < count; iterationIndex++)
{
iteratorValue = target[iterationIndex];
iterator.Value = iteratorValue;
if (iterationIndex == 1)
{
iterator.First = BoxedValues.False;
}
if (iterationIndex == lastIndex)
{
iterator.Last = BoxedValues.True;
}
boxedIndex = iterationIndex;
iterator.Index = boxedIndex;
blockParams[_0] = iteratorValue;
blockParams[_1] = boxedIndex;
innerContext.Value = iteratorValue;
template(writer, innerContext);
}
if (iterationIndex == 0)
{
innerContext.Value = context.Value;
ifEmpty(writer, innerContext);
}
}
public override void Invoke(TextWriter output, HelperOptions options, object context, params object[] arguments)
{
if (arguments.Length != 1)
{
throw new HandlebarsException("{{with}} helper must have exactly one argument");
}
if (HandlebarsUtils.IsTruthyOrNonEmpty(arguments[0]))
{
using var frame = options.CreateFrame(arguments[0]);
var blockParamsValues = new BlockParamsValues(frame, options.BlockParams);
blockParamsValues.CreateProperty(0, out var _0);
blockParamsValues[_0] = arguments[0];
options.Template(output, frame);
}
else
{
options.Inverse(output, context);
}
}
