/// <summary>
/// Registers all of the required Handlebars helpers.
/// </summary>
public static void RegisterHelpers()
{
if (_areRegistered)
{
return;
}
_areRegistered = true;
// Will check that the first argument equals at least one of the subsequent arguments.
Handlebars.RegisterHelper("ifeq", (writer, context, parameters, args) =>
{
if (IfEq(args))
{
context.Template(writer, parameters);
}
else
{
context.Inverse(writer, parameters);
}
});
// Will check that the first argument does not equal any of the subsequent arguments.
Handlebars.RegisterHelper("ifne", (writer, context, parameters, args) =>
{
if (IfEq(args))
{
context.Inverse(writer, parameters);
}
else
{
context.Template(writer, parameters);
}
});
// Will check that the first argument is less than or equal to the subsequent arguments.
Handlebars.RegisterHelper("ifle", (writer, context, parameters, args) =>
{
if (IfLe(args))
{
context.Template(writer, parameters);
}
else
{
context.Inverse(writer, parameters);
}
});
// Will check that the first argument is greater than or equal to the subsequent arguments.
Handlebars.RegisterHelper("ifge", (writer, context, parameters, args) =>
{
if (IfGe(args))
{
context.Template(writer, parameters);
}
else
{
context.Inverse(writer, parameters);
}
});
// Will check that all of the arguments have a non-<c>null</c> value.
Handlebars.RegisterHelper("ifval", (writer, context, parameters, args) =>
{
foreach (var arg in args)
{
if (arg == null)
{
context.Inverse(writer, parameters);
return;
}
}
context.Template(writer, parameters);
});
// Will check that all of the arguments have a <c>null</c> value.
Handlebars.RegisterHelper("ifnull", (writer, context, parameters, args) =>
{
foreach (var arg in args)
{
if (arg != null)
{
context.Inverse(writer, parameters);
return;
}
}
context.Template(writer, parameters);
});
// Will check that any of the arguments have a <c>true</c> value where bool; otherwise, non-null.
Handlebars.RegisterHelper("ifor", (writer, context, parameters, args) =>
{
foreach (var arg in args)
{
if (arg is bool opt)
{
if (opt)
{
context.Template(writer, parameters);
return;
}
}
else if (arg != null)
{
var opt2 = arg as bool?;
if (opt2 != null && !opt2.Value)
{
continue;
}
context.Template(writer, parameters);
return;
}
}
context.Inverse(writer, parameters);
});
// Converts a value to lowercase.
Handlebars.RegisterHelper("lower", (writer, context, parameters) => writer.WriteSafeString(parameters.FirstOrDefault()?.ToString()?.ToLowerInvariant() ?? ""));
// NOTE: Any ending in 'x' are to explicitly ignore special names!!!
// Converts a value to camelcase.
Handlebars.RegisterHelper("camel", (writer, context, parameters) => writer.WriteSafeString(StringConversion.ToCamelCase(parameters.FirstOrDefault()?.ToString()) ?? ""));
Handlebars.RegisterHelper("camelx", (writer, context, parameters) => writer.WriteSafeString(StringConversion.ToCamelCase(parameters.FirstOrDefault()?.ToString(), true) ?? ""));
// Converts a value to pascalcase.
Handlebars.RegisterHelper("pascal", (writer, context, parameters) => writer.WriteSafeString(StringConversion.ToPascalCase(parameters.FirstOrDefault()?.ToString()) ?? ""));
Handlebars.RegisterHelper("pascalx", (writer, context, parameters) => writer.WriteSafeString(StringConversion.ToPascalCase(parameters.FirstOrDefault()?.ToString(), true) ?? ""));
// Converts a value to private case.
Handlebars.RegisterHelper("private", (writer, context, parameters) => writer.WriteSafeString(StringConversion.ToPrivateCase(parameters.FirstOrDefault()?.ToString()) ?? ""));
Handlebars.RegisterHelper("privatex", (writer, context, parameters) => writer.WriteSafeString(StringConversion.ToPrivateCase(parameters.FirstOrDefault()?.ToString(), true) ?? ""));
Handlebars.RegisterHelper("sentence", (writer, context, parameters) => writer.WriteSafeString(StringConversion.ToSentenceCase(parameters.FirstOrDefault()?.ToString()) ?? ""));
Handlebars.RegisterHelper("sentencex", (writer, context, parameters) => writer.WriteSafeString(StringConversion.ToSentenceCase(parameters.FirstOrDefault()?.ToString(), true) ?? ""));
// Converts a value to the c# '<see cref="value"/>' comments equivalent.
Handlebars.RegisterHelper("seecomments", (writer, context, parameters) => writer.WriteSafeString(ConfigBase.ToSeeComments(parameters.FirstOrDefault()?.ToString())));
// Inserts indent spaces based on the passed index value.
Handlebars.RegisterHelper("indent", (writer, context, parameters) => writer.WriteSafeString(new string(' ', 4 * (int)(parameters.FirstOrDefault() ?? 0))));
// Adds a value to a value.
Handlebars.RegisterHelper("add", (writer, context, parameters) =>
{
int sum = 0;
foreach (var p in parameters)
{
if (p is int pi)
{
sum += pi;
}
else if (p is string ps)
{
sum += int.Parse(ps, NumberStyles.Integer, CultureInfo.InvariantCulture);
}
else
{
writer.WriteSafeString("!!! add with invalid integer !!!");
}
}
writer.WriteSafeString(sum);
});
}
