Lowercasing of tokens?

[richard-edwards]

Is there a way to lowercase a token? I'm looking for something like {{Entity:lowercase}}. If Entity value is 'Ticket', then I want 'ticket'

[richard-edwards]

Sorry, missed the docs on this one. Created my own this way.

public class LowerTagDefinition : InlineTagDefinition
{

    public LowerTagDefinition()
        : base("lower")
    {
    }

    protected override IEnumerable<TagParameter> GetParameters()
    {
        return new[] { new TagParameter("param") { IsRequired = true } };
    }

    public override void GetText(TextWriter writer, Dictionary<string, object> arguments, Scope context)
    {
        writer.Write(arguments["param"].ToString().ToLower());
    }
}

Usage is : {{#lower MyVar}}

[jehugaleahsa]

There are two options, create a custom tag or override the KeyFound event.

Option 1:

public class LowerCaseTagDefinition : InlineTagDefinition
{
    private const string keyParameterName = "key";

    public LowerCaseTagDefinition()
        : base("lowercase")
    {
    }

    protected override IEnumerable<TagParameter> GetParameters()
    {
        return new TagParameter[] { new TagParameter(keyParameterName) };
    }

    public override void GetText(TextWriter writer, Dictionary<string, object> arguments, Scope context)
    {
        object value;
        if (arguments.TryGetValue(keyParameterName, out value) && value != null)
        {
            writer.Write(value.ToString().ToLowerInvariant());
        }
    }
}

// ...

FormatCompiler compiler = new FormatCompiler();
compiler.RegisterTag(new LowerCaseTagDefinition(), true);

Generator generator = compiler.Compile("{{#lowercase name}}");
string value = generator.Render(new { name = "Bob Smith" });

Option 2:

FormatCompiler compiler = new FormatCompiler();
Generator generator = compiler.Compile("{{name}}");
generator.KeyFound += (sender, e) => {
    e.Substitute = e.Substitute == null ? null : Convert.ToString(e.Substitute).ToLowerInvariant();
};
string value = generator.Render(new { name = "Bob Smith" });

The first approach has the benefit of giving more control over which tags are made lowercase. The second option is a lot less code. Although, if you want to control which keys are made lowercase, it becomes a bit of a pain. The second approach is also the only way to apply formatting via {{key:format}}.