Handlebars.Net If Condition Helper

Question

I try to write a Handlebar.Net helper which works like Equals. The Helper should be used like

{{#eq name "Foo"}}
    true
{{else}}
    false
{{/eq}}

But I don´t know how to implement this helper. In JS there is this example but I can´t find an example for C#.

My first shot was:

Handlebars.RegisterHelper("#eq", (output, context, data) =>
{
    if (data.Length != 2)
        output.WriteSafeString("false");

    output.WriteSafeString(data[0].Equals(data[1]));
});

But this just writes True or False into my file.

maybe try this github.com/rexm/Handlebars.Net

HariHaran
– HariHaran

2019-12-10 14:17:46 +00:00
Commented Dec 10, 2019 at 14:17 — HariHaran
– HariHaran, Commented Dec 10, 2019 at 14:17

doppelgreener · Accepted Answer · 2019-12-11 10:32:05Z

I´ve found the solution:

Handlebars.RegisterHelper(Equals, (output, options, context, data) => 
{
    if (data.Length != 2)
        options.Inverse(output, null);

    if (data[0].Equals(data[1]))
        options.Template(output, null);
    else
        options.Inverse(output, null);
});
Handlebars.RegisterHelper(LowerThan, (output, options, context, data) =>
{
    IntegerOperation(LowerThan, ref output, ref options, ref data);
});

Handlebars.RegisterHelper(GreaterThan, (output, options, context, data) =>
{
    IntegerOperation(GreaterThan, ref output, ref options, ref data);
});

Handlebars.RegisterHelper(LowerEquals, (output, options, context, data) =>
{
    IntegerOperation(LowerEquals, ref output, ref options, ref data);
});

Handlebars.RegisterHelper(GreaterEquals, (output, options, context, data) =>
{
    IntegerOperation(GreaterEquals, ref output, ref options, ref data);
});


private static void IntegerOperation(string operation, ref System.IO.TextWriter output, ref HelperOptions options, ref object[] data)
{
    if (data.Length != 2)
    {
        options.Inverse(output, null);
        return;
    }

    if (!int.TryParse(data[0].ToString(), out int leftValue))
    {
        options.Inverse(output, null);
        return;
    }

    if (!int.TryParse(data[1].ToString(), out int rightValue))
    {
        options.Inverse(output, null);
        return;
    }

    switch (operation)
    {
        case "lt":
            if (leftValue < rightValue)
                options.Template(output, null);
            else
                options.Inverse(output, null);
            break;
        case "le":
            if (leftValue <= rightValue)
                options.Template(output, null);
            else
                options.Inverse(output, null);
            break;
        case "gt":
            if (leftValue > rightValue)
                options.Template(output, null);
            else
                options.Inverse(output, null);
            break;
        case "ge":
            if (leftValue >= rightValue)
                options.Template(output, null);
            else
                options.Inverse(output, null);
            break;
        default:
            break;
    }

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