Using json-rust as a parser driver without building values

[Yoric]

I'm currently using json-rust to parse pretty large JSON files (hundreds of Mb). Unsurprisingly, this eventually blows up the stack. Now, as it turns out, I immediately convert the format from JSON to something else, so if this crate could provide a way to go straight to my destination format without having to first go through JSON values, that would probably save time and space.

[Yoric]

The code of parser.rs makes me think that this would not be impossible. We "just" need to make separate Parser.parse and StackBlock more modular.

I'll see if I can find time to work on this.