Text template engine for generating content

I implemented this a while ago for the startup, been meaning to publish it to github, and now have - here. It was used to support a multitude of text templates that had to be transformed to become part of email message content - and a way to do that which was flexible was required.

The idea is trivial, treat a stream of bytes/characters as containing substitution tokens and rewrite those tokens using a supplied context. Also includes iteration, expression support, context switching and a few other minor aspects.

It's a VS 2017, C# solution, targeting .netcoreapp 1.1 and .net 4.6+.

Once set up, transformation is ultra trivial, assuming a text template and some domain object being supplied to the pro forma method shown below:

        private string GenerateMessage<TObject>(string doc, TObject ctx) {
            ParseResult res = Parser.Parse(doc);
            EvaluationContext ec = EvaluationContext.From(ctx);
            var ctx = res.Execute(ExecutionContext.Build(ec));
            return ctx.context.ToString();
        }