Implement a real parser for tags

[clipperhouse]

Implement a real parser for tags

[infogulch]

Just for the sake of flexibility, it might be better if the TypeParameters allowed integers in addition to identifiers.

[infogulch]

For reference, this is the code used to parse struct tags from the reflect package: http://golang.org/src/pkg/reflect/type.go#L763

[clipperhouse]

@infogulch Thanks for the tip on the existing parser. We have a new lexer & parser in production, based on the text/template parser which Rob P often points to.

I think the type parameters will stick to being Go identifiers, and more so, we’ll evaluate them as types before passing to a TypeWriter. I realize allowing other things in there would allow TypeWriters different sorts of interpretation, but as a design choice, I prefer type parameters to be types and nothing else.

[clipperhouse]

A lexer & parser has been implemented. Evaluating type parameters has not been implemented but will consider that a separate issue.