function _typeof(o) { "@babel/helpers - typeof"; return _typeof = "function" == typeof Symbol && "symbol" == typeof Symbol.iterator ? function (o) { return typeof o; } : function (o) { return o && "function" == typeof Symbol && o.constructor === Symbol && o !== Symbol.prototype ? "symbol" : typeof o; }, _typeof(o); }
function _defineProperties(target, props) { for (var i = 0; i < props.length; i++) { var descriptor = props[i]; descriptor.enumerable = descriptor.enumerable || false; descriptor.configurable = true; if ("value" in descriptor) descriptor.writable = true; Object.defineProperty(target, _toPropertyKey(descriptor.key), descriptor); } }
function _createClass(Constructor, protoProps, staticProps) { if (protoProps) _defineProperties(Constructor.prototype, protoProps); if (staticProps) _defineProperties(Constructor, staticProps); Object.defineProperty(Constructor, "prototype", { writable: false }); return Constructor; }
function _toPropertyKey(t) { var i = _toPrimitive(t, "string"); return "symbol" == _typeof(i) ? i : i + ""; }
function _toPrimitive(t, r) { if ("object" != _typeof(t) || !t) return t; var e = t[Symbol.toPrimitive]; if (void 0 !== e) { var i = e.call(t, r || "default"); if ("object" != _typeof(i)) return i; throw new TypeError("@@toPrimitive must return a primitive value."); } return ("string" === r ? String : Number)(t); }
function _classCallCheck(instance, Constructor) { if (!(instance instanceof Constructor)) { throw new TypeError("Cannot call a class as a function"); } }
function _callSuper(t, o, e) { return o = _getPrototypeOf(o), _possibleConstructorReturn(t, _isNativeReflectConstruct() ? Reflect.construct(o, e || [], _getPrototypeOf(t).constructor) : o.apply(t, e)); }
function _possibleConstructorReturn(self, call) { if (call && (_typeof(call) === "object" || typeof call === "function")) { return call; } else if (call !== void 0) { throw new TypeError("Derived constructors may only return object or undefined"); } return _assertThisInitialized(self); }
function _assertThisInitialized(self) { if (self === void 0) { throw new ReferenceError("this hasn't been initialised - super() hasn't been called"); } return self; }
function _isNativeReflectConstruct() { try { var t = !Boolean.prototype.valueOf.call(Reflect.construct(Boolean, [], function () {})); } catch (t) {} return (_isNativeReflectConstruct = function _isNativeReflectConstruct() { return !!t; })(); }
function _getPrototypeOf(o) { _getPrototypeOf = Object.setPrototypeOf ? Object.getPrototypeOf.bind() : function _getPrototypeOf(o) { return o.__proto__ || Object.getPrototypeOf(o); }; return _getPrototypeOf(o); }
function _inherits(subClass, superClass) { if (typeof superClass !== "function" && superClass !== null) { throw new TypeError("Super expression must either be null or a function"); } subClass.prototype = Object.create(superClass && superClass.prototype, { constructor: { value: subClass, writable: true, configurable: true } }); Object.defineProperty(subClass, "prototype", { writable: false }); if (superClass) _setPrototypeOf(subClass, superClass); }
function _setPrototypeOf(o, p) { _setPrototypeOf = Object.setPrototypeOf ? Object.setPrototypeOf.bind() : function _setPrototypeOf(o, p) { o.__proto__ = p; return o; }; return _setPrototypeOf(o, p); }
import { EditorState, Plugin, PluginKey } from 'prosemirror-state';
import { Transform } from 'prosemirror-transform';
import { Decoration, DecorationSet } from 'prosemirror-view';
import './ui/czi-selection-placeholder.css';
var PLACE_HOLDER_ID = {
  name: 'SelectionPlaceholderPlugin'
};
var singletonInstance = null;

// https://prosemirror.net/examples/upload/
var SPEC = {
  // [FS] IRAD-1005 2020-07-07
  // Upgrade outdated packages.
  key: new PluginKey('SelectionPlaceholderPlugin'),
  state: {
    init: function init() {
      return DecorationSet.empty;
    },
    apply: function apply(tr, set) {
      set = set.map(tr.mapping, tr.doc);
      var action = tr.getMeta(this);
      if (!action) {
        return set;
      }
      if (action.add) {
        var deco = Decoration.inline(action.add.from, action.add.to, {
          "class": 'czi-selection-placeholder'
        }, {
          id: PLACE_HOLDER_ID
        });
        set = set.add(tr.doc, [deco]);
      } else if (action.remove) {
        var found = set.find(null, null, specFinder);
        set = set.remove(found);
      }
      return set;
    }
  },
  props: {
    decorations: function decorations(state) {
      var plugin = singletonInstance;
      return plugin ? plugin.getState(state) : null;
    }
  }
};
var SelectionPlaceholderPlugin = /*#__PURE__*/function (_Plugin) {
  function SelectionPlaceholderPlugin() {
    var _this;
    _classCallCheck(this, SelectionPlaceholderPlugin);
    _this = _callSuper(this, SelectionPlaceholderPlugin, [SPEC]);
    if (singletonInstance) {
      return _possibleConstructorReturn(_this, singletonInstance);
    }
    singletonInstance = _this;
    return _this;
  }
  _inherits(SelectionPlaceholderPlugin, _Plugin);
  return _createClass(SelectionPlaceholderPlugin);
}(Plugin);
function specFinder(spec) {
  return spec.id == PLACE_HOLDER_ID;
}
function findSelectionPlaceholder(state) {
  if (!singletonInstance) {
    return null;
  }
  if (!state.plugins.includes(singletonInstance)) {
    console.warn('SelectionPlaceholderPlugin is not installed');
    return null;
  }
  var decos = singletonInstance.getState(state);
  var found = decos.find(null, null, specFinder);
  var pos = found.length ? found[0] : null;
  return pos || null;
}
export function showSelectionPlaceholder(state, tr) {
  tr = tr || state.tr;
  var plugin = singletonInstance;
  if (!plugin || !tr.selection || tr.selection.empty) {
    return tr;
  }
  var deco = findSelectionPlaceholder(state);
  if (deco === null) {
    tr = tr.setMeta(plugin, {
      add: {
        from: tr.selection.from,
        to: tr.selection.to
      }
    });
  }
  return tr;
}
export function hideSelectionPlaceholder(state, tr) {
  tr = tr || state.tr;
  var plugin = singletonInstance;
  if (!plugin) {
    return tr;
  }
  var deco = findSelectionPlaceholder(state);
  if (deco) {
    tr = tr.setMeta(plugin, {
      remove: {}
    });
  }
  return tr;
}
export default SelectionPlaceholderPlugin;