A small JSON parsing library (original) (raw)

Brian Goetz brian.goetz at oracle.com
Thu Feb 14 08:20:42 PST 2013

just to see how it goes, I've written a small all-in-one-file library that parses a JSON files to an object tree defined by the user. The mapping is specified using lambdas, so it's compact but can burn your eyes :)

https://github.com/forax/jsonjedi

Very cool!

During the development, I've found two main gotchas, the first one is the scope rules of the lambda parameter, I've already sent message about this rule, it seems that eah time I write a page of code, the compiler stop me because I tend to re-use the same variable name for the very same object. In the example named Big [1], the builder of JSON schema is used recursively but I've to use a different names each time (builder, builder2, builder3).

I can see how this would be annoying to write. But as a reader, I really prefer it! If all the variables were called "builder", I would be confused. Much easier if I know exactly which builder you are referring to -- especially since the declaration -- "builder -> { ..." -- often starts near the right margin.

We should really remove this stupid rule from the JLS and go back to the classical shadowing rules.

Your Big.java provides an excellent example why this rule is great! :)

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