Slicer Kata

This is the skeleton for a slicer utility that lets you slice up JSON documents on the command line. The guts have been intentionally left un-implemented as an exercise for the reader.

Given the following JSON document:

{
  "oregon": {
    "cities": ["portland", "salem", "eugene"],
    "capitol": "salem"
  },
  "california": {
    "cities": ["san francisco", "los angeles", "san jose", "sacramento"],
    "capitol": "sacramento"
  },
  "washington": {
    "cities": ["tacoma", "seattle", "olympia"],
    "capitol": "olympia"
  }
}

... slicer lets you do things like:

$ slicer oregon cities.json
{ "cities": ["portland", "salem", "eugene"], "capitol": "salem" }

$ slicer oregon.cities cities.json
["portland", "salem", "eugene"]

$ slicer oregon.capitol cities.json
salem

$ slicer florida.capitol
null

$ slicer 'oregon.cities[1]' cities.json
salem

$ slicer '*.cities[0]' cities.json
["portland", "san francisco", "tacoma"]

The executable is already built, and can be run with bundle exec ./bin/slicer. The example JSON file above exists in text/fixtures/cities.json.

It relies on the following method on the Slicer module, left for you to implement:

def self.slice(query, tree)
  ...
end

query should be a query string as seen in the examples above, and tree should be an already-parsed JSON object graph. Your task is to implement slice in any way you see fit.

benweint/slicer-kata

Slicer Kata