C# string formatter with custom rules

usage

see unit tests code in Tests.cs.

1. simple format (like c# string.Format)

code:

StringEx.Format("{0}", "argument1")

result:

argument1

2. custom rule format without parameters

// only register once
StringEx.RegisterFormatFunc("name", () => "PlayerNameA");

// after register
StringEx.Format("{name}")

result:

PlayerNameA

3. custom rule format with parameters

// only register once
StringEx.RegisterFormatFunc("i18n", (index, parameters) => 
    {
        // TOOD load text from i18n config
        return $"i18n_content_({parameters[index]})";
    });

// after register
StringEx.Format("{0:i18n}", 1001)

result:

i18n_content_1001

4. different rules in different context

var formatter1 = new StringFormatter.StringFormatter();
formatter1.RegisterFormatFunc("name", () => "name in context1");
            
var formatter2 = new StringFormatter.StringFormatter();
formatter2.RegisterFormatFunc("name", () => "name in context2");

// after register
formatter1.Format("{name}");
formatter2.Format("{name}");

result:

name in context1
name in context2