BlockHelper inversion (^) throws

[oformaniuk]

Scenario

Handlebars.js

Template

{{^test input}}empty{{else}}not empty{{/test}}

Helper

Handlebars.registerHelper("test", function(conditional, options) {
  if (conditional) {
    return options.fn(conditional);
  } else {
    return options.inverse(conditional);
  }
});

Input & result

{ "input": 1 } // Result: not empty

{ "input": 0 } // Result: empty

Handlebars.Net

[Fact]
public void BlockHelperWithInversion()
{
    string source = @"{{^test input}}empty{{else}}not empty{{/test}}";

    var handlebars = Handlebars.Create();
    handlebars.RegisterHelper("test", (output, options, context, arguments) =>
    {
        if (HandlebarsUtils.IsTruthy(arguments[0]))
        {
            options.Template(output, context);
        }
        else
        {
            options.Inverse(output, context);
        }
    });

    var template = handlebars.Compile(source);
    
    Assert.Equal("empty", template(null));
    Assert.Equal("empty", template(new { otherInput = 1 }));
    Assert.Equal("not empty", template(new { input = 1 }));
}

Actual result

• ❌ ^test detected as HandlebarsHelper instead of HandlebarsBlockHelper
• ❌ ^test tried to be late-bounded
• ❌ Template references a helper that is not registered. Could not find helper '^test' exception thrown

Expected result

• matches to Handlebars.js behaviour.