template.coffee

tmpl = 
  path: '.'
  aggregate: 
    total: (key, value, existing) -> if !isArray(value) then value else value.sort().reverse()[0]
    pages: (key, value, existing) -> if !isArray(value) then value else value.sort().reverse()[0]
  as:
    bins: 
      path: 'Items.SearchBinSets.SearchBinSet.Bin'
      key: 'BinParameter.Value'
      value: 'BinItemCount'
      aggregate: (key, value, existing) -> Math.max(value, existing || 0)
    items: 
      path: 'Items.Item'
      all: true
      as:
        rank: 'SalesRank'
        title: 'ItemAttributes.Title'
        artist: 'ItemAttributes.Artist'
        manufacturer: 'ItemAttributes.Manufacturer'
        category: 'ItemAttributes.ProductGroup'
        price: 'Offers.Offer.OfferListing.Price.FormattedPrice'
        percent_saved: 'Offers.Offer.OfferListing.PercentageSaved'
        availability: 'Offers.Offer.OfferListing.Availability'
        price_new: 'OfferSummary.LowestNewPrice.FormattedPrice'
        price_used: 'OfferSummary.LowestUsedPrice.FormattedPrice'
        url: 'DetailPageURL'
        similar:
          path: 'SimilarProducts.SimilarProduct'
          key: 'ASIN'
          value: 'Title'
        images:
          path: '.'
          choose: ['SmallImage', 'MediumImage', 'LargeImage']
          format: (node, value, key) -> key: key.replace(/Image$/, '').toLowerCase()
          nested: true
          as:
            url: 'URL'
            height: 'Height.#'
            width: 'Width.#'
        image_sets:
          path: 'ImageSets.ImageSet'
          key: '@.Category'
          choose: (node, value, key) -> key isnt '@'
          format: (node, value, key) -> key: key.replace(/Image$/, '').toLowerCase()
          nested: true
          as:
            url: 'URL'
            height: 'Height.#'
            width: 'Width.#'
        links:
          path: 'ItemLinks.ItemLink'
          key: 'Description'
          value: 'URL'
        

new ObjectTemplate(tmpl).transform data