Replaces interpolation holes in strings with values from a dictionary, where the template is defined a runtime.

The TemplateString class is a factory that accepts a dictionary of properties, and efficiently replaces tokens in a template to create an output. The template is specified at runtime using "handlebar" notation.

using Vertical.Text;

var templateString = TemplateString.Create("{filename}.{format}[.{compression}]");
var properties = new Dictionary<string, object?>
{
    ["filename"] = "output",
    ["format"] = "json",
    ["compression"] = "gz"
};

Console.WriteLine(templateString.Replace(properties));

// Output:
//    output.json.gz

properties["compression"] = null;

Console.WriteLine(templateString.Replace(properties));

// Output:
//    output.json

• Properties that are always supplied as non-null values can be defined using braced handlebars.
• Properties that the application may supply with null values must be defined using bracketed handlebars, otherwise the template will throw an exception during the replacement operation.
• Content inside bracketed handlebars will only be part of replacement strings if a braced handlebar within it has a non-null value.
• A bracketed handlebar is ignored as a template if it doesn't contain a braced handlebar.
• Braced handlebars can be ignored using double-brace escaping, e.g. {{escape}}.