json schema validator

[workingdog]

Although I'm new to Rapture I think its a great set of libraries.

Is there, or will there be a json schema validator as part of the library set, something like the pure java at: https://github.com/fge/json-schema-validator

[Jon Pretty]

Hi,

I haven't done any work on JSON Schema yet (I think that what we've already got provides a pretty comprehensive set of tools for schema-like tasks) but it's an interesting idea. Currently the closest thing is being able to define a structure of nested case classes, and extract them in one go.

What I'd like to do with JSON Schema is be able to define a JSON Schema type which could then be used to extract structured data from a `Json` value. Here's how it might look, using the example schema from http://json-schema.org/examples.html:

  val schema = jsonSchema"""{

    "title": "Example Schema",

    "type": "object",

    "properties": {

      "firstName": { "type": "string" },

      "lastName": { "type": "string" },

      "age": {

        "description": "Age in years",

        "type": "integer",

        "minimum": 0
      }
    },

    "required": ["firstName", "lastName"]

  }"""

  val j = json"""{ "firstName": "Jon", "lastName": "Pretty" }"""

  val v = j.as[schema.Type]

  val name: String = v.firstName+v.lastName

  val age: Option[Int] = v.age

  val x = v.somethingElse // Won't compile; doesn't exist

This will probably take a fair amount of work to implement, as it will need a whitebox macro to create a type representing the schema. But I've created an issue as an aide memoire here:

  https://github.com/propensive/rapture-json/issues/31

Thanks for the suggestion!
Jon

On 16 December 2014 at 07:58, workingdog <ringow...@gmail.com> wrote:

Although I'm new to Rapture I think its a great set of libraries.

Is there, or will there be a json schema validator as part of the library set, something like the pure java at: https://github.com/fge/json-schema-validator

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Jon Pretty | @propensive