Boostnote/browser/main/Mixins/Catalyst.js

(function (root, factory) {
  module.exports = factory()
}(this, function () {
  function getIn (object, path) {
    var stack = path.split('.')
    while (stack.length > 1) {
      object = object[stack.shift()]
    }
    return object[stack.shift()]
  }

  function updateIn (object, path, value) {
    var current = object
    var stack = path.split('.')
    while (stack.length > 1) {
      current = current[stack.shift()]
    }
    current[stack.shift()] = value
    return object
  }

  function setPartialState (component, path, value) {
    component.setState(
      updateIn(component.state, path, value))
  }

  return {
    LinkedStateMixin: {
      linkState: function (path) {
        return {
          value: getIn(this.state, path),
          requestChange: setPartialState.bind(null, this, path)
        }
      }
    }
  }

}))