hopglass/lib/filters/nodefilter.js

define([], function () {
  return function (filter) {
    return function (data) {
      var n = Object.create(data)
      n.nodes = {}

      for (var key in data.nodes)
        n.nodes[key] = data.nodes[key].filter(filter)

      var filteredIds = new Set()

      n.graph = {}
      n.graph.nodes = data.graph.nodes.filter( function (d) {
        var r
        if (d.node)
          r = filter(d.node)
        else
          r = filter({})

        if (r)
          filteredIds.add(d.id)

        return r
      })

      n.graph.links = data.graph.links.filter( function (d) {
        return filteredIds.has(d.source.id) && filteredIds.has(d.target.id)
      })

      return n
    }
  }
})