const kyoml = require('kyoml');

const json = kyoml.compile(`
  key1 = 'value1'
  key2 = 'value2'

  block {
    key3 = [1,2,3]
  }
`)

const kyoml = require('kyoml');

const json = kyoml.compile(`
  key1 = 'value1'
  key2 = 'value2'

  block {
    @uppercase

    key3 = [1,2,3]
  }
`, {
  directives: {
    uppercase: (node) => {
      const {
        root,   // The root of the entire document
        base,   // The direct parent on which element you're operating on is
        key,    // The key on the base which contains the element
        path,   // The full path from the root (e.g document.block)
        value,  // The element itself
        set,    // A handy replace method
        get     // A getter allowing you to access anything in the entire document
      } = node;

      // You can now operate on your node

      set(_.mapKeys(value, key => key.toUpperCase()));
    }
  }
})

const kyoml = require('kyoml');

const json = kyoml.compile(`
  @prefix("foo_")

  key1 = 'value1'
  key2 = 'value2'

  block {
    key3 = [1,2,3]
  }
`, {
  directives: {
    prefix: ({ value }, prefix) => {
      set(_.mapKeys(value, key => prefix + key));
    }
  }
})

const kyoml = require('kyoml');

const json = kyoml.compile(`
  @addProperty("foo")

  key1 = 'value1'
  key2 = 'value2'
`, {
  mappers: {
    addProperty: (value, key) => ({ ...value, [key]: 'bar' })
  }
})

const kyoml = require('kyoml');

const json = kyoml.compile(`
  key1 = 'value1' |> @uppercase
  key2 = @uppercase <| 'value2'
`, {
  mappers: {
    uppercase: (value) => (value.toUpperCase())
  }
})