import React, { useLayoutEffect, useEffect, useRef, createContext, useContext, useMemo, useCallback, useState } from 'react';
import { Path, Node as Node$1, Editor, Text as Text$1, Range, Element as Element$1, Transforms } from 'slate';
import throttle from 'lodash/throttle';
import scrollIntoView from 'scroll-into-view-if-needed';
import getDirection from 'direction';
import { isKeyHotkey } from 'is-hotkey';
import ReactDOM from 'react-dom';

function _defineProperty(obj, key, value) {
  if (key in obj) {
    Object.defineProperty(obj, key, {
      value: value,
      enumerable: true,
      configurable: true,
      writable: true
    });
  } else {
    obj[key] = value;
  }

  return obj;
}

function _objectWithoutPropertiesLoose(source, excluded) {
  if (source == null) return {};
  var target = {};
  var sourceKeys = Object.keys(source);
  var key, i;

  for (i = 0; i < sourceKeys.length; i++) {
    key = sourceKeys[i];
    if (excluded.indexOf(key) >= 0) continue;
    target[key] = source[key];
  }

  return target;
}

function _objectWithoutProperties(source, excluded) {
  if (source == null) return {};
  var target = _objectWithoutPropertiesLoose(source, excluded);
  var key, i;

  if (Object.getOwnPropertySymbols) {
    var sourceSymbolKeys = Object.getOwnPropertySymbols(source);

    for (i = 0; i < sourceSymbolKeys.length; i++) {
      key = sourceSymbolKeys[i];
      if (excluded.indexOf(key) >= 0) continue;
      if (!Object.prototype.propertyIsEnumerable.call(source, key)) continue;
      target[key] = source[key];
    }
  }

  return target;
}

/**
 * Leaf content strings.
 */

var String = props => {
  var {
    isLast,
    leaf,
    parent,
    text
  } = props;
  var editor = useEditor();
  var path = ReactEditor.findPath(editor, text);
  var parentPath = Path.parent(path); // COMPAT: Render text inside void nodes with a zero-width space.
  // So the node can contain selection but the text is not visible.

  if (editor.isVoid(parent)) {
    return React.createElement(ZeroWidthString, {
      length: Node$1.string(parent).length
    });
  } // COMPAT: If this is the last text node in an empty block, render a zero-
  // width space that will convert into a line break when copying and pasting
  // to support expected plain text.


  if (leaf.text === '' && parent.children[parent.children.length - 1] === text && !editor.isInline(parent) && Editor.string(editor, parentPath) === '') {
    return React.createElement(ZeroWidthString, {
      isLineBreak: true
    });
  } // COMPAT: If the text is empty, it's because it's on the edge of an inline
  // node, so we render a zero-width space so that the selection can be
  // inserted next to it still.


  if (leaf.text === '') {
    return React.createElement(ZeroWidthString, null);
  } // COMPAT: Browsers will collapse trailing new lines at the end of blocks,
  // so we need to add an extra trailing new lines to prevent that.


  if (isLast && leaf.text.slice(-1) === '\n') {
    return React.createElement(TextString, {
      isTrailing: true,
      text: leaf.text
    });
  }

  return React.createElement(TextString, {
    text: leaf.text
  });
};
/**
 * Leaf strings with text in them.
 */


var TextString = props => {
  var {
    text,
    isTrailing = false
  } = props;
  return React.createElement("span", {
    "data-slate-string": true
  }, text, isTrailing ? '\n' : null);
};
/**
 * Leaf strings without text, render as zero-width strings.
 */


var ZeroWidthString = props => {
  var {
    length = 0,
    isLineBreak = false
  } = props;
  return React.createElement("span", {
    "data-slate-zero-width": isLineBreak ? 'n' : 'z',
    "data-slate-length": length
  }, '\uFEFF', isLineBreak ? React.createElement("br", null) : null);
};

/**
 * Two weak maps that allow us rebuild a path given a node. They are populated
 * at render time such that after a render occurs we can always backtrack.
 */
var NODE_TO_INDEX = new WeakMap();
var NODE_TO_PARENT = new WeakMap();
/**
 * Weak maps that allow us to go between Slate nodes and DOM nodes. These
 * are used to resolve DOM event-related logic into Slate actions.
 */

var EDITOR_TO_ELEMENT = new WeakMap();
var ELEMENT_TO_NODE = new WeakMap();
var KEY_TO_ELEMENT = new WeakMap();
var NODE_TO_ELEMENT = new WeakMap();
var NODE_TO_KEY = new WeakMap();
/**
 * Weak maps for storing editor-related state.
 */

var IS_READ_ONLY = new WeakMap();
var IS_FOCUSED = new WeakMap();
/**
 * Weak map for associating the context `onChange` context with the plugin.
 */

var EDITOR_TO_ON_CHANGE = new WeakMap();
/**
 * Symbols.
 */

var PLACEHOLDER_SYMBOL = Symbol('placeholder');

/**
 * Individual leaves in a text node with unique formatting.
 */

var Leaf = props => {
  var {
    leaf,
    isLast,
    text,
    parent,
    renderLeaf = props => React.createElement(DefaultLeaf, Object.assign({}, props))
  } = props;
  var children = React.createElement(String, {
    isLast: isLast,
    leaf: leaf,
    parent: parent,
    text: text
  });

  if (leaf[PLACEHOLDER_SYMBOL]) {
    children = React.createElement(React.Fragment, null, React.createElement("span", {
      contentEditable: false,
      style: {
        pointerEvents: 'none',
        display: 'inline-block',
        verticalAlign: 'text-top',
        width: '0',
        maxWidth: '100%',
        whiteSpace: 'nowrap',
        opacity: '0.333'
      }
    }, leaf.placeholder), children);
  } // COMPAT: Having the `data-` attributes on these leaf elements ensures that
  // in certain misbehaving browsers they aren't weirdly cloned/destroyed by
  // contenteditable behaviors. (2019/05/08)


  var attributes = {
    'data-slate-leaf': true
  };
  return renderLeaf({
    attributes,
    children,
    leaf,
    text
  });
};

var MemoizedLeaf = React.memo(Leaf, (prev, next) => {
  return next.parent === prev.parent && next.isLast === prev.isLast && next.renderLeaf === prev.renderLeaf && next.text === prev.text && Text$1.matches(next.leaf, prev.leaf);
});
/**
 * The default custom leaf renderer.
 */

var DefaultLeaf = props => {
  var {
    attributes,
    children
  } = props;
  return React.createElement("span", Object.assign({}, attributes), children);
};

/**
 * Prevent warning on SSR by falling back to useEffect when window is not defined
 */

var useIsomorphicLayoutEffect = typeof window !== 'undefined' ? useLayoutEffect : useEffect;

/**
 * Text.
 */

var Text = props => {
  var {
    decorations,
    isLast,
    parent,
    renderLeaf,
    text
  } = props;
  var editor = useEditor();
  var ref = useRef(null);
  var leaves = Text$1.decorations(text, decorations);
  var key = ReactEditor.findKey(editor, text);
  var children = [];

  for (var i = 0; i < leaves.length; i++) {
    var leaf = leaves[i];
    children.push(React.createElement(MemoizedLeaf, {
      isLast: isLast && i === leaves.length - 1,
      key: "".concat(key.id, "-").concat(i),
      leaf: leaf,
      text: text,
      parent: parent,
      renderLeaf: renderLeaf
    }));
  } // Update element-related weak maps with the DOM element ref.


  useIsomorphicLayoutEffect(() => {
    if (ref.current) {
      KEY_TO_ELEMENT.set(key, ref.current);
      NODE_TO_ELEMENT.set(text, ref.current);
      ELEMENT_TO_NODE.set(ref.current, text);
    } else {
      KEY_TO_ELEMENT.delete(key);
      NODE_TO_ELEMENT.delete(text);
    }
  });
  return React.createElement("span", {
    "data-slate-node": "text",
    ref: ref
  }, children);
};

var MemoizedText = React.memo(Text, (prev, next) => {
  return next.parent === prev.parent && next.isLast === prev.isLast && next.renderLeaf === prev.renderLeaf && next.text === prev.text;
});

/**
 * A React context for sharing the `selected` state of an element.
 */

var SelectedContext = createContext(false);
/**
 * Get the current `selected` state of an element.
 */

var useSelected = () => {
  return useContext(SelectedContext);
};

/**
 * Element.
 */

var Element = props => {
  var {
    decorate,
    decorations,
    element,
    renderElement = p => React.createElement(DefaultElement, Object.assign({}, p)),
    renderLeaf,
    selection
  } = props;
  var ref = useRef(null);
  var editor = useEditor();
  var readOnly = useReadOnly();
  var isInline = editor.isInline(element);
  var key = ReactEditor.findKey(editor, element);
  var children = React.createElement(Children, {
    decorate: decorate,
    decorations: decorations,
    node: element,
    renderElement: renderElement,
    renderLeaf: renderLeaf,
    selection: selection
  }); // Attributes that the developer must mix into the element in their
  // custom node renderer component.

  var attributes = {
    'data-slate-node': 'element',
    ref
  };

  if (isInline) {
    attributes['data-slate-inline'] = true;
  } // If it's a block node with inline children, add the proper `dir` attribute
  // for text direction.


  if (!isInline && Editor.hasInlines(editor, element)) {
    var text = Node$1.string(element);
    var dir = getDirection(text);

    if (dir === 'rtl') {
      attributes.dir = dir;
    }
  } // If it's a void node, wrap the children in extra void-specific elements.


  if (Editor.isVoid(editor, element)) {
    attributes['data-slate-void'] = true;

    if (!readOnly && isInline) {
      attributes.contentEditable = false;
    }

    var Tag = isInline ? 'span' : 'div';
    var [[_text]] = Node$1.texts(element);
    children = readOnly ? null : React.createElement(Tag, {
      "data-slate-spacer": true,
      style: {
        height: '0',
        color: 'transparent',
        outline: 'none',
        position: 'absolute'
      }
    }, React.createElement(MemoizedText, {
      decorations: [],
      isLast: false,
      parent: element,
      text: _text
    }));
    NODE_TO_INDEX.set(_text, 0);
    NODE_TO_PARENT.set(_text, element);
  } // Update element-related weak maps with the DOM element ref.


  useIsomorphicLayoutEffect(() => {
    if (ref.current) {
      KEY_TO_ELEMENT.set(key, ref.current);
      NODE_TO_ELEMENT.set(element, ref.current);
      ELEMENT_TO_NODE.set(ref.current, element);
    } else {
      KEY_TO_ELEMENT.delete(key);
      NODE_TO_ELEMENT.delete(element);
    }
  });
  return React.createElement(SelectedContext.Provider, {
    value: !!selection
  }, renderElement({
    attributes,
    children,
    element
  }));
};

var MemoizedElement = React.memo(Element, (prev, next) => {
  return prev.decorate === next.decorate && prev.element === next.element && prev.renderElement === next.renderElement && prev.renderLeaf === next.renderLeaf && isRangeListEqual(prev.decorations, next.decorations) && (prev.selection === next.selection || !!prev.selection && !!next.selection && Range.equals(prev.selection, next.selection));
});
/**
 * The default element renderer.
 */

var DefaultElement = props => {
  var {
    attributes,
    children,
    element
  } = props;
  var editor = useEditor();
  var Tag = editor.isInline(element) ? 'span' : 'div';
  return React.createElement(Tag, Object.assign({}, attributes, {
    style: {
      position: 'relative'
    }
  }), children);
};
/**
 * Check if a list of ranges is equal to another.
 *
 * PERF: this requires the two lists to also have the ranges inside them in the
 * same order, but this is an okay constraint for us since decorations are
 * kept in order, and the odd case where they aren't is okay to re-render for.
 */

var isRangeListEqual = (list, another) => {
  if (list.length !== another.length) {
    return false;
  }

  for (var i = 0; i < list.length; i++) {
    var range = list[i];
    var other = another[i];

    if (!Range.equals(range, other)) {
      return false;
    }
  }

  return true;
};

/**
 * A React context for sharing the editor object.
 */

var EditorContext = createContext(null);
/**
 * Get the current editor object from the React context.
 */

var useEditor = () => {
  var editor = useContext(EditorContext);

  if (!editor) {
    throw new Error("The `useEditor` hook must be used inside the <Slate> component's context.");
  }

  return editor;
};

/**
 * Children.
 */

var Children = props => {
  var {
    decorate,
    decorations,
    node,
    renderElement,
    renderLeaf,
    selection
  } = props;
  var editor = useEditor();
  var path = ReactEditor.findPath(editor, node);
  var children = [];
  var isLeafBlock = Element$1.isElement(node) && !editor.isInline(node) && Editor.hasInlines(editor, node);

  for (var i = 0; i < node.children.length; i++) {
    var p = path.concat(i);
    var n = node.children[i];
    var key = ReactEditor.findKey(editor, n);
    var range = Editor.range(editor, p);
    var sel = selection && Range.intersection(range, selection);
    var ds = decorate([n, p]);

    for (var dec of decorations) {
      var d = Range.intersection(dec, range);

      if (d) {
        ds.push(d);
      }
    }

    if (Element$1.isElement(n)) {
      children.push(React.createElement(MemoizedElement, {
        decorate: decorate,
        decorations: ds,
        element: n,
        key: key.id,
        renderElement: renderElement,
        renderLeaf: renderLeaf,
        selection: sel
      }));
    } else {
      children.push(React.createElement(MemoizedText, {
        decorations: ds,
        key: key.id,
        isLast: isLeafBlock && i === node.children.length - 1,
        parent: node,
        renderLeaf: renderLeaf,
        text: n
      }));
    }

    NODE_TO_INDEX.set(n, i);
    NODE_TO_PARENT.set(n, node);
  }

  return React.createElement(React.Fragment, null, children);
};

var IS_IOS = typeof navigator !== 'undefined' && typeof window !== 'undefined' && /iPad|iPhone|iPod/.test(navigator.userAgent) && !window.MSStream;
var IS_APPLE = typeof navigator !== 'undefined' && /Mac OS X/.test(navigator.userAgent);
var IS_FIREFOX = typeof navigator !== 'undefined' && /^(?!.*Seamonkey)(?=.*Firefox).*/i.test(navigator.userAgent);
var IS_SAFARI = typeof navigator !== 'undefined' && /Version\/[\d\.]+.*Safari/.test(navigator.userAgent); // "modern" Edge was released at 79.x

var IS_EDGE_LEGACY = typeof navigator !== 'undefined' && /Edge?\/(?:[0-6][0-9]|[0-7][0-8])/i.test(navigator.userAgent);

/**
 * Hotkey mappings for each platform.
 */

var HOTKEYS = {
  bold: 'mod+b',
  compose: ['down', 'left', 'right', 'up', 'backspace', 'enter'],
  moveBackward: 'left',
  moveForward: 'right',
  moveWordBackward: 'ctrl+left',
  moveWordForward: 'ctrl+right',
  deleteBackward: 'shift?+backspace',
  deleteForward: 'shift?+delete',
  extendBackward: 'shift+left',
  extendForward: 'shift+right',
  italic: 'mod+i',
  splitBlock: 'shift?+enter',
  undo: 'mod+z'
};
var APPLE_HOTKEYS = {
  moveLineBackward: 'opt+up',
  moveLineForward: 'opt+down',
  moveWordBackward: 'opt+left',
  moveWordForward: 'opt+right',
  deleteBackward: ['ctrl+backspace', 'ctrl+h'],
  deleteForward: ['ctrl+delete', 'ctrl+d'],
  deleteLineBackward: 'cmd+shift?+backspace',
  deleteLineForward: ['cmd+shift?+delete', 'ctrl+k'],
  deleteWordBackward: 'opt+shift?+backspace',
  deleteWordForward: 'opt+shift?+delete',
  extendLineBackward: 'opt+shift+up',
  extendLineForward: 'opt+shift+down',
  redo: 'cmd+shift+z',
  transposeCharacter: 'ctrl+t'
};
var WINDOWS_HOTKEYS = {
  deleteWordBackward: 'ctrl+shift?+backspace',
  deleteWordForward: 'ctrl+shift?+delete',
  redo: ['ctrl+y', 'ctrl+shift+z']
};
/**
 * Create a platform-aware hotkey checker.
 */

var create = key => {
  var generic = HOTKEYS[key];
  var apple = APPLE_HOTKEYS[key];
  var windows = WINDOWS_HOTKEYS[key];
  var isGeneric = generic && isKeyHotkey(generic);
  var isApple = apple && isKeyHotkey(apple);
  var isWindows = windows && isKeyHotkey(windows);
  return event => {
    if (isGeneric && isGeneric(event)) return true;
    if (IS_APPLE && isApple && isApple(event)) return true;
    if (!IS_APPLE && isWindows && isWindows(event)) return true;
    return false;
  };
};
/**
 * Hotkeys.
 */


var Hotkeys = {
  isBold: create('bold'),
  isCompose: create('compose'),
  isMoveBackward: create('moveBackward'),
  isMoveForward: create('moveForward'),
  isDeleteBackward: create('deleteBackward'),
  isDeleteForward: create('deleteForward'),
  isDeleteLineBackward: create('deleteLineBackward'),
  isDeleteLineForward: create('deleteLineForward'),
  isDeleteWordBackward: create('deleteWordBackward'),
  isDeleteWordForward: create('deleteWordForward'),
  isExtendBackward: create('extendBackward'),
  isExtendForward: create('extendForward'),
  isExtendLineBackward: create('extendLineBackward'),
  isExtendLineForward: create('extendLineForward'),
  isItalic: create('italic'),
  isMoveLineBackward: create('moveLineBackward'),
  isMoveLineForward: create('moveLineForward'),
  isMoveWordBackward: create('moveWordBackward'),
  isMoveWordForward: create('moveWordForward'),
  isRedo: create('redo'),
  isSplitBlock: create('splitBlock'),
  isTransposeCharacter: create('transposeCharacter'),
  isUndo: create('undo')
};

/**
 * A React context for sharing the `readOnly` state of the editor.
 */

var ReadOnlyContext = createContext(false);
/**
 * Get the current `readOnly` state of the editor.
 */

var useReadOnly = () => {
  return useContext(ReadOnlyContext);
};

/**
 * A React context for sharing the editor object, in a way that re-renders the
 * context whenever changes occur.
 */

var SlateContext = createContext(null);
/**
 * Get the current editor object from the React context.
 */

var useSlate = () => {
  var context = useContext(SlateContext);

  if (!context) {
    throw new Error("The `useSlate` hook must be used inside the <SlateProvider> component's context.");
  }

  var [editor] = context;
  return editor;
};

/**
 * Types.
 */
/**
 * Check if a DOM node is a comment node.
 */

var isDOMComment = value => {
  return isDOMNode(value) && value.nodeType === 8;
};
/**
 * Check if a DOM node is an element node.
 */

var isDOMElement = value => {
  return isDOMNode(value) && value.nodeType === 1;
};
/**
 * Check if a value is a DOM node.
 */

var isDOMNode = value => {
  return value instanceof Node;
};
/**
 * Check if a DOM node is an element node.
 */

var isDOMText = value => {
  return isDOMNode(value) && value.nodeType === 3;
};
/**
 * Checks whether a paste event is a plaintext-only event.
 */

var isPlainTextOnlyPaste = event => {
  return event.clipboardData && event.clipboardData.getData('text/plain') !== '' && event.clipboardData.types.length === 1;
};
/**
 * Normalize a DOM point so that it always refers to a text node.
 */

var normalizeDOMPoint = domPoint => {
  var [node, offset] = domPoint; // If it's an element node, its offset refers to the index of its children
  // including comment nodes, so try to find the right text child node.

  if (isDOMElement(node) && node.childNodes.length) {
    var isLast = offset === node.childNodes.length;
    var direction = isLast ? 'backward' : 'forward';
    var index = isLast ? offset - 1 : offset;
    node = getEditableChild(node, index, direction); // If the node has children, traverse until we have a leaf node. Leaf nodes
    // can be either text nodes, or other void DOM nodes.

    while (isDOMElement(node) && node.childNodes.length) {
      var i = isLast ? node.childNodes.length - 1 : 0;
      node = getEditableChild(node, i, direction);
    } // Determine the new offset inside the text node.


    offset = isLast && node.textContent != null ? node.textContent.length : 0;
  } // Return the node and offset.


  return [node, offset];
};
/**
 * Get the nearest editable child at `index` in a `parent`, preferring
 * `direction`.
 */

var getEditableChild = (parent, index, direction) => {
  var {
    childNodes
  } = parent;
  var child = childNodes[index];
  var i = index;
  var triedForward = false;
  var triedBackward = false; // While the child is a comment node, or an element node with no children,
  // keep iterating to find a sibling non-void, non-comment node.

  while (isDOMComment(child) || isDOMElement(child) && child.childNodes.length === 0 || isDOMElement(child) && child.getAttribute('contenteditable') === 'false') {
    if (triedForward && triedBackward) {
      break;
    }

    if (i >= childNodes.length) {
      triedForward = true;
      i = index - 1;
      direction = 'backward';
      continue;
    }

    if (i < 0) {
      triedBackward = true;
      i = index + 1;
      direction = 'forward';
      continue;
    }

    child = childNodes[i];
    i += direction === 'forward' ? 1 : -1;
  }

  return child;
};
/**
 * Get a plaintext representation of the content of a node, accounting for block
 * elements which get a newline appended.
 *
 * The domNode must be attached to the DOM.
 */

var getPlainText = domNode => {
  var text = '';

  if (isDOMText(domNode) && domNode.nodeValue) {
    return domNode.nodeValue;
  }

  if (isDOMElement(domNode)) {
    for (var childNode of Array.from(domNode.childNodes)) {
      text += getPlainText(childNode);
    }

    var display = getComputedStyle(domNode).getPropertyValue('display');

    if (display === 'block' || display === 'list' || domNode.tagName === 'BR') {
      text += '\n';
    }
  }

  return text;
};

function ownKeys(object, enumerableOnly) { var keys = Object.keys(object); if (Object.getOwnPropertySymbols) { var symbols = Object.getOwnPropertySymbols(object); if (enumerableOnly) symbols = symbols.filter(function (sym) { return Object.getOwnPropertyDescriptor(object, sym).enumerable; }); keys.push.apply(keys, symbols); } return keys; }

function _objectSpread(target) { for (var i = 1; i < arguments.length; i++) { var source = arguments[i] != null ? arguments[i] : {}; if (i % 2) { ownKeys(Object(source), true).forEach(function (key) { _defineProperty(target, key, source[key]); }); } else if (Object.getOwnPropertyDescriptors) { Object.defineProperties(target, Object.getOwnPropertyDescriptors(source)); } else { ownKeys(Object(source)).forEach(function (key) { Object.defineProperty(target, key, Object.getOwnPropertyDescriptor(source, key)); }); } } return target; }

var HAS_BEFORE_INPUT_SUPPORT = !(IS_FIREFOX || IS_EDGE_LEGACY);
/**
 * Editable.
 */

var Editable = props => {
  var {
    autoFocus,
    decorate = defaultDecorate,
    onDOMBeforeInput: propsOnDOMBeforeInput,
    placeholder,
    readOnly = false,
    renderElement,
    renderLeaf,
    style = {},
    as: Component = 'div'
  } = props,
      attributes = _objectWithoutProperties(props, ["autoFocus", "decorate", "onDOMBeforeInput", "placeholder", "readOnly", "renderElement", "renderLeaf", "style", "as"]);

  var editor = useSlate();
  var ref = useRef(null); // Update internal state on each render.

  IS_READ_ONLY.set(editor, readOnly); // Keep track of some state for the event handler logic.

  var state = useMemo(() => ({
    isComposing: false,
    isUpdatingSelection: false,
    latestElement: null
  }), []); // Update element-related weak maps with the DOM element ref.

  useIsomorphicLayoutEffect(() => {
    if (ref.current) {
      EDITOR_TO_ELEMENT.set(editor, ref.current);
      NODE_TO_ELEMENT.set(editor, ref.current);
      ELEMENT_TO_NODE.set(ref.current, editor);
    } else {
      NODE_TO_ELEMENT.delete(editor);
    }
  }); // Whenever the editor updates, make sure the DOM selection state is in sync.

  useIsomorphicLayoutEffect(() => {
    var {
      selection
    } = editor;
    var domSelection = window.getSelection();

    if (state.isComposing || !domSelection || !ReactEditor.isFocused(editor)) {
      return;
    }

    var hasDomSelection = domSelection.type !== 'None'; // If the DOM selection is properly unset, we're done.

    if (!selection && !hasDomSelection) {
      return;
    } // verify that the dom selection is in the editor


    var editorElement = EDITOR_TO_ELEMENT.get(editor);
    var hasDomSelectionInEditor = false;

    if (editorElement.contains(domSelection.anchorNode) && editorElement.contains(domSelection.focusNode)) {
      hasDomSelectionInEditor = true;
    } // If the DOM selection is in the editor and the editor selection is already correct, we're done.


    if (hasDomSelection && hasDomSelectionInEditor && selection && Range.equals(ReactEditor.toSlateRange(editor, domSelection), selection)) {
      return;
    } // Otherwise the DOM selection is out of sync, so update it.


    var el = ReactEditor.toDOMNode(editor, editor);
    state.isUpdatingSelection = true;
    domSelection.removeAllRanges();
    var newDomRange = selection && ReactEditor.toDOMRange(editor, selection);

    if (newDomRange) {
      domSelection.addRange(newDomRange);
      var leafEl = newDomRange.startContainer.parentElement;
      scrollIntoView(leafEl, {
        scrollMode: 'if-needed'
      });
    }

    setTimeout(() => {
      // COMPAT: In Firefox, it's not enough to create a range, you also need
      // to focus the contenteditable element too. (2016/11/16)
      if (newDomRange && IS_FIREFOX) {
        el.focus();
      }

      state.isUpdatingSelection = false;
    });
  }); // The autoFocus TextareaHTMLAttribute doesn't do anything on a div, so it
  // needs to be manually focused.

  useEffect(() => {
    if (ref.current && autoFocus) {
      ref.current.focus();
    }
  }, [autoFocus]); // Listen on the native `beforeinput` event to get real "Level 2" events. This
  // is required because React's `beforeinput` is fake and never really attaches
  // to the real event sadly. (2019/11/01)
  // https://github.com/facebook/react/issues/11211

  var onDOMBeforeInput = useCallback(event => {
    if (!readOnly && hasEditableTarget(editor, event.target) && !isDOMEventHandled(event, propsOnDOMBeforeInput)) {
      var {
        selection
      } = editor;
      var {
        inputType: type
      } = event;
      var data = event.dataTransfer || event.data || undefined; // These two types occur while a user is composing text and can't be
      // cancelled. Let them through and wait for the composition to end.

      if (type === 'insertCompositionText' || type === 'deleteCompositionText') {
        return;
      }

      event.preventDefault(); // COMPAT: For the deleting forward/backward input types we don't want
      // to change the selection because it is the range that will be deleted,
      // and those commands determine that for themselves.

      if (!type.startsWith('delete') || type.startsWith('deleteBy')) {
        var [targetRange] = event.getTargetRanges();

        if (targetRange) {
          var range = ReactEditor.toSlateRange(editor, targetRange);

          if (!selection || !Range.equals(selection, range)) {
            Transforms.select(editor, range);
          }
        }
      } // COMPAT: If the selection is expanded, even if the command seems like
      // a delete forward/backward command it should delete the selection.


      if (selection && Range.isExpanded(selection) && type.startsWith('delete')) {
        Editor.deleteFragment(editor);
        return;
      }

      switch (type) {
        case 'deleteByComposition':
        case 'deleteByCut':
        case 'deleteByDrag':
          {
            Editor.deleteFragment(editor);
            break;
          }

        case 'deleteContent':
        case 'deleteContentForward':
          {
            Editor.deleteForward(editor);
            break;
          }

        case 'deleteContentBackward':
          {
            Editor.deleteBackward(editor);
            break;
          }

        case 'deleteEntireSoftLine':
          {
            Editor.deleteBackward(editor, {
              unit: 'line'
            });
            Editor.deleteForward(editor, {
              unit: 'line'
            });
            break;
          }

        case 'deleteHardLineBackward':
          {
            Editor.deleteBackward(editor, {
              unit: 'block'
            });
            break;
          }

        case 'deleteSoftLineBackward':
          {
            Editor.deleteBackward(editor, {
              unit: 'line'
            });
            break;
          }

        case 'deleteHardLineForward':
          {
            Editor.deleteForward(editor, {
              unit: 'block'
            });
            break;
          }

        case 'deleteSoftLineForward':
          {
            Editor.deleteForward(editor, {
              unit: 'line'
            });
            break;
          }

        case 'deleteWordBackward':
          {
            Editor.deleteBackward(editor, {
              unit: 'word'
            });
            break;
          }

        case 'deleteWordForward':
          {
            Editor.deleteForward(editor, {
              unit: 'word'
            });
            break;
          }

        case 'insertLineBreak':
        case 'insertParagraph':
          {
            Editor.insertBreak(editor);
            break;
          }

        case 'insertFromComposition':
        case 'insertFromDrop':
        case 'insertFromPaste':
        case 'insertFromYank':
        case 'insertReplacementText':
        case 'insertText':
          {
            if (data instanceof DataTransfer) {
              ReactEditor.insertData(editor, data);
            } else if (typeof data === 'string') {
              Editor.insertText(editor, data);
            }

            break;
          }
      }
    }
  }, [readOnly]); // Attach a native DOM event handler for `beforeinput` events, because React's
  // built-in `onBeforeInput` is actually a leaky polyfill that doesn't expose
  // real `beforeinput` events sadly... (2019/11/04)
  // https://github.com/facebook/react/issues/11211

  useIsomorphicLayoutEffect(() => {
    if (ref.current) {
      // @ts-ignore The `beforeinput` event isn't recognized.
      ref.current.addEventListener('beforeinput', onDOMBeforeInput);
    }

    return () => {
      if (ref.current) {
        // @ts-ignore The `beforeinput` event isn't recognized.
        ref.current.removeEventListener('beforeinput', onDOMBeforeInput);
      }
    };
  }, [onDOMBeforeInput]); // Listen on the native `selectionchange` event to be able to update any time
  // the selection changes. This is required because React's `onSelect` is leaky
  // and non-standard so it doesn't fire until after a selection has been
  // released. This causes issues in situations where another change happens
  // while a selection is being dragged.

  var onDOMSelectionChange = useCallback(throttle(() => {
    if (!readOnly && !state.isComposing && !state.isUpdatingSelection) {
      var {
        activeElement
      } = window.document;
      var el = ReactEditor.toDOMNode(editor, editor);
      var domSelection = window.getSelection();

      if (activeElement === el) {
        state.latestElement = activeElement;
        IS_FOCUSED.set(editor, true);
      } else {
        IS_FOCUSED.delete(editor);
      }

      if (!domSelection) {
        return Transforms.deselect(editor);
      }

      var {
        anchorNode,
        focusNode
      } = domSelection;
      var anchorNodeSelectable = hasEditableTarget(editor, anchorNode) || isTargetInsideVoid(editor, anchorNode);
      var focusNodeSelectable = hasEditableTarget(editor, focusNode) || isTargetInsideVoid(editor, focusNode);

      if (anchorNodeSelectable && focusNodeSelectable) {
        var range = ReactEditor.toSlateRange(editor, domSelection);
        Transforms.select(editor, range);
      } else {
        Transforms.deselect(editor);
      }
    }
  }, 100), [readOnly]); // Attach a native DOM event handler for `selectionchange`, because React's
  // built-in `onSelect` handler doesn't fire for all selection changes. It's a
  // leaky polyfill that only fires on keypresses or clicks. Instead, we want to
  // fire for any change to the selection inside the editor. (2019/11/04)
  // https://github.com/facebook/react/issues/5785

  useIsomorphicLayoutEffect(() => {
    window.document.addEventListener('selectionchange', onDOMSelectionChange);
    return () => {
      window.document.removeEventListener('selectionchange', onDOMSelectionChange);
    };
  }, [onDOMSelectionChange]);
  var decorations = decorate([editor, []]);

  if (placeholder && editor.children.length === 1 && Array.from(Node$1.texts(editor)).length === 1 && Node$1.string(editor) === '') {
    var start = Editor.start(editor, []);
    decorations.push({
      [PLACEHOLDER_SYMBOL]: true,
      placeholder,
      anchor: start,
      focus: start
    });
  }

  return React.createElement(ReadOnlyContext.Provider, {
    value: readOnly
  }, React.createElement(Component // COMPAT: The Grammarly Chrome extension works by changing the DOM
  // out from under `contenteditable` elements, which leads to weird
  // behaviors so we have to disable it like editor. (2017/04/24)
  , Object.assign({
    "data-gramm": false,
    role: readOnly ? undefined : 'textbox'
  }, attributes, {
    // COMPAT: Certain browsers don't support the `beforeinput` event, so we'd
    // have to use hacks to make these replacement-based features work.
    spellCheck: !HAS_BEFORE_INPUT_SUPPORT ? undefined : attributes.spellCheck,
    autoCorrect: !HAS_BEFORE_INPUT_SUPPORT ? undefined : attributes.autoCorrect,
    autoCapitalize: !HAS_BEFORE_INPUT_SUPPORT ? undefined : attributes.autoCapitalize,
    "data-slate-editor": true,
    "data-slate-node": "value",
    contentEditable: readOnly ? undefined : true,
    suppressContentEditableWarning: true,
    ref: ref,
    style: _objectSpread({
      // Prevent the default outline styles.
      outline: 'none',
      // Preserve adjacent whitespace and new lines.
      whiteSpace: 'pre-wrap',
      // Allow words to break if they are too long.
      wordWrap: 'break-word'
    }, style),
    onBeforeInput: useCallback(event => {
      // COMPAT: Certain browsers don't support the `beforeinput` event, so we
      // fall back to React's leaky polyfill instead just for it. It
      // only works for the `insertText` input type.
      if (!HAS_BEFORE_INPUT_SUPPORT && !readOnly && !isEventHandled(event, attributes.onBeforeInput) && hasEditableTarget(editor, event.target)) {
        event.preventDefault();
        var text = event.data;
        Editor.insertText(editor, text);
      }
    }, [readOnly]),
    onBlur: useCallback(event => {
      if (readOnly || state.isUpdatingSelection || !hasEditableTarget(editor, event.target) || isEventHandled(event, attributes.onBlur)) {
        return;
      } // COMPAT: If the current `activeElement` is still the previous
      // one, this is due to the window being blurred when the tab
      // itself becomes unfocused, so we want to abort early to allow to
      // editor to stay focused when the tab becomes focused again.


      if (state.latestElement === window.document.activeElement) {
        return;
      }

      var {
        relatedTarget
      } = event;
      var el = ReactEditor.toDOMNode(editor, editor); // COMPAT: The event should be ignored if the focus is returning
      // to the editor from an embedded editable element (eg. an <input>
      // element inside a void node).

      if (relatedTarget === el) {
        return;
      } // COMPAT: The event should be ignored if the focus is moving from
      // the editor to inside a void node's spacer element.


      if (isDOMElement(relatedTarget) && relatedTarget.hasAttribute('data-slate-spacer')) {
        return;
      } // COMPAT: The event should be ignored if the focus is moving to a
      // non- editable section of an element that isn't a void node (eg.
      // a list item of the check list example).


      if (relatedTarget != null && isDOMNode(relatedTarget) && ReactEditor.hasDOMNode(editor, relatedTarget)) {
        var node = ReactEditor.toSlateNode(editor, relatedTarget);

        if (Element$1.isElement(node) && !editor.isVoid(node)) {
          return;
        }
      }

      IS_FOCUSED.delete(editor);
    }, [readOnly, attributes.onBlur]),
    onClick: useCallback(event => {
      if (!readOnly && hasTarget(editor, event.target) && !isEventHandled(event, attributes.onClick) && isDOMNode(event.target)) {
        var node = ReactEditor.toSlateNode(editor, event.target);
        var path = ReactEditor.findPath(editor, node);

        var _start = Editor.start(editor, path);

        if (Editor.void(editor, {
          at: _start
        })) {
          var range = Editor.range(editor, _start);
          Transforms.select(editor, range);
        }
      }
    }, [readOnly, attributes.onClick]),
    onCompositionEnd: useCallback(event => {
      if (hasEditableTarget(editor, event.target) && !isEventHandled(event, attributes.onCompositionEnd)) {
        state.isComposing = false; // COMPAT: In Chrome, `beforeinput` events for compositions
        // aren't correct and never fire the "insertFromComposition"
        // type that we need. So instead, insert whenever a composition
        // ends since it will already have been committed to the DOM.

        if (!IS_SAFARI && !IS_FIREFOX && event.data) {
          Editor.insertText(editor, event.data);
        }
      }
    }, [attributes.onCompositionEnd]),
    onCompositionStart: useCallback(event => {
      if (hasEditableTarget(editor, event.target) && !isEventHandled(event, attributes.onCompositionStart)) {
        state.isComposing = true;
      }
    }, [attributes.onCompositionStart]),
    onCopy: useCallback(event => {
      if (hasEditableTarget(editor, event.target) && !isEventHandled(event, attributes.onCopy)) {
        event.preventDefault();
        ReactEditor.setFragmentData(editor, event.clipboardData);
      }
    }, [attributes.onCopy]),
    onCut: useCallback(event => {
      if (!readOnly && hasEditableTarget(editor, event.target) && !isEventHandled(event, attributes.onCut)) {
        event.preventDefault();
        ReactEditor.setFragmentData(editor, event.clipboardData);
        var {
          selection
        } = editor;

        if (selection && Range.isExpanded(selection)) {
          Editor.deleteFragment(editor);
        }
      }
    }, [readOnly, attributes.onCut]),
    onDragOver: useCallback(event => {
      if (hasTarget(editor, event.target) && !isEventHandled(event, attributes.onDragOver)) {
        // Only when the target is void, call `preventDefault` to signal
        // that drops are allowed. Editable content is droppable by
        // default, and calling `preventDefault` hides the cursor.
        var node = ReactEditor.toSlateNode(editor, event.target);

        if (Editor.isVoid(editor, node)) {
          event.preventDefault();
        }
      }
    }, [attributes.onDragOver]),
    onDragStart: useCallback(event => {
      if (hasTarget(editor, event.target) && !isEventHandled(event, attributes.onDragStart)) {
        var node = ReactEditor.toSlateNode(editor, event.target);
        var path = ReactEditor.findPath(editor, node);
        var voidMatch = Editor.void(editor, {
          at: path
        }); // If starting a drag on a void node, make sure it is selected
        // so that it shows up in the selection's fragment.

        if (voidMatch) {
          var range = Editor.range(editor, path);
          Transforms.select(editor, range);
        }

        ReactEditor.setFragmentData(editor, event.dataTransfer);
      }
    }, [attributes.onDragStart]),
    onDrop: useCallback(event => {
      if (hasTarget(editor, event.target) && !readOnly && !isEventHandled(event, attributes.onDrop)) {
        // COMPAT: Certain browsers don't fire `beforeinput` events at all, and
        // Chromium browsers don't properly fire them for files being
        // dropped into a `contenteditable`. (2019/11/26)
        // https://bugs.chromium.org/p/chromium/issues/detail?id=1028668
        if (!HAS_BEFORE_INPUT_SUPPORT || !IS_SAFARI && event.dataTransfer.files.length > 0) {
          event.preventDefault();
          var range = ReactEditor.findEventRange(editor, event);
          var data = event.dataTransfer;
          Transforms.select(editor, range);
          ReactEditor.insertData(editor, data);
        }
      }
    }, [readOnly, attributes.onDrop]),
    onFocus: useCallback(event => {
      if (!readOnly && !state.isUpdatingSelection && hasEditableTarget(editor, event.target) && !isEventHandled(event, attributes.onFocus)) {
        var el = ReactEditor.toDOMNode(editor, editor);
        state.latestElement = window.document.activeElement; // COMPAT: If the editor has nested editable elements, the focus
        // can go to them. In Firefox, this must be prevented because it
        // results in issues with keyboard navigation. (2017/03/30)

        if (IS_FIREFOX && event.target !== el) {
          el.focus();
          return;
        }

        IS_FOCUSED.set(editor, true);
      }
    }, [readOnly, attributes.onFocus]),
    onKeyDown: useCallback(event => {
      if (!readOnly && hasEditableTarget(editor, event.target) && !isEventHandled(event, attributes.onKeyDown)) {
        var {
          nativeEvent
        } = event;
        var {
          selection
        } = editor; // COMPAT: Since we prevent the default behavior on
        // `beforeinput` events, the browser doesn't think there's ever
        // any history stack to undo or redo, so we have to manage these
        // hotkeys ourselves. (2019/11/06)

        if (Hotkeys.isRedo(nativeEvent)) {
          event.preventDefault();

          if (typeof editor.redo === 'function') {
            editor.redo();
          }

          return;
        }

        if (Hotkeys.isUndo(nativeEvent)) {
          event.preventDefault();

          if (typeof editor.undo === 'function') {
            editor.undo();
          }

          return;
        } // COMPAT: Certain browsers don't handle the selection updates
        // properly. In Chrome, the selection isn't properly extended.
        // And in Firefox, the selection isn't properly collapsed.
        // (2017/10/17)


        if (Hotkeys.isMoveLineBackward(nativeEvent)) {
          event.preventDefault();
          Transforms.move(editor, {
            unit: 'line',
            reverse: true
          });
          return;
        }

        if (Hotkeys.isMoveLineForward(nativeEvent)) {
          event.preventDefault();
          Transforms.move(editor, {
            unit: 'line'
          });
          return;
        }

        if (Hotkeys.isExtendLineBackward(nativeEvent)) {
          event.preventDefault();
          Transforms.move(editor, {
            unit: 'line',
            edge: 'focus',
            reverse: true
          });
          return;
        }

        if (Hotkeys.isExtendLineForward(nativeEvent)) {
          event.preventDefault();
          Transforms.move(editor, {
            unit: 'line',
            edge: 'focus'
          });
          return;
        } // COMPAT: If a void node is selected, or a zero-width text node
        // adjacent to an inline is selected, we need to handle these
        // hotkeys manually because browsers won't be able to skip over
        // the void node with the zero-width space not being an empty
        // string.


        if (Hotkeys.isMoveBackward(nativeEvent)) {
          event.preventDefault();

          if (selection && Range.isCollapsed(selection)) {
            Transforms.move(editor, {
              reverse: true
            });
          } else {
            Transforms.collapse(editor, {
              edge: 'start'
            });
          }

          return;
        }

        if (Hotkeys.isMoveForward(nativeEvent)) {
          event.preventDefault();

          if (selection && Range.isCollapsed(selection)) {
            Transforms.move(editor);
          } else {
            Transforms.collapse(editor, {
              edge: 'end'
            });
          }

          return;
        }

        if (Hotkeys.isMoveWordBackward(nativeEvent)) {
          event.preventDefault();
          Transforms.move(editor, {
            unit: 'word',
            reverse: true
          });
          return;
        }

        if (Hotkeys.isMoveWordForward(nativeEvent)) {
          event.preventDefault();
          Transforms.move(editor, {
            unit: 'word'
          });
          return;
        } // COMPAT: Certain browsers don't support the `beforeinput` event, so we
        // fall back to guessing at the input intention for hotkeys.
        // COMPAT: In iOS, some of these hotkeys are handled in the


        if (!HAS_BEFORE_INPUT_SUPPORT) {
          // We don't have a core behavior for these, but they change the
          // DOM if we don't prevent them, so we have to.
          if (Hotkeys.isBold(nativeEvent) || Hotkeys.isItalic(nativeEvent) || Hotkeys.isTransposeCharacter(nativeEvent)) {
            event.preventDefault();
            return;
          }

          if (Hotkeys.isSplitBlock(nativeEvent)) {
            event.preventDefault();
            Editor.insertBreak(editor);
            return;
          }

          if (Hotkeys.isDeleteBackward(nativeEvent)) {
            event.preventDefault();

            if (selection && Range.isExpanded(selection)) {
              Editor.deleteFragment(editor);
            } else {
              Editor.deleteBackward(editor);
            }

            return;
          }

          if (Hotkeys.isDeleteForward(nativeEvent)) {
            event.preventDefault();

            if (selection && Range.isExpanded(selection)) {
              Editor.deleteFragment(editor);
            } else {
              Editor.deleteForward(editor);
            }

            return;
          }

          if (Hotkeys.isDeleteLineBackward(nativeEvent)) {
            event.preventDefault();

            if (selection && Range.isExpanded(selection)) {
              Editor.deleteFragment(editor);
            } else {
              Editor.deleteBackward(editor, {
                unit: 'line'
              });
            }

            return;
          }

          if (Hotkeys.isDeleteLineForward(nativeEvent)) {
            event.preventDefault();

            if (selection && Range.isExpanded(selection)) {
              Editor.deleteFragment(editor);
            } else {
              Editor.deleteForward(editor, {
                unit: 'line'
              });
            }

            return;
          }

          if (Hotkeys.isDeleteWordBackward(nativeEvent)) {
            event.preventDefault();

            if (selection && Range.isExpanded(selection)) {
              Editor.deleteFragment(editor);
            } else {
              Editor.deleteBackward(editor, {
                unit: 'word'
              });
            }

            return;
          }

          if (Hotkeys.isDeleteWordForward(nativeEvent)) {
            event.preventDefault();

            if (selection && Range.isExpanded(selection)) {
              Editor.deleteFragment(editor);
            } else {
              Editor.deleteForward(editor, {
                unit: 'word'
              });
            }

            return;
          }
        }
      }
    }, [readOnly, attributes.onKeyDown]),
    onPaste: useCallback(event => {
      // COMPAT: Certain browsers don't support the `beforeinput` event, so we
      // fall back to React's `onPaste` here instead.
      // COMPAT: Firefox, Chrome and Safari are not emitting `beforeinput` events
      // when "paste without formatting" option is used.
      // This unfortunately needs to be handled with paste events instead.
      if ((!HAS_BEFORE_INPUT_SUPPORT || isPlainTextOnlyPaste(event.nativeEvent)) && !readOnly && hasEditableTarget(editor, event.target) && !isEventHandled(event, attributes.onPaste)) {
        event.preventDefault();
        ReactEditor.insertData(editor, event.clipboardData);
      }
    }, [readOnly, attributes.onPaste])
  }), React.createElement(Children, {
    decorate: decorate,
    decorations: decorations,
    node: editor,
    renderElement: renderElement,
    renderLeaf: renderLeaf,
    selection: editor.selection
  })));
};
/**
 * A default memoized decorate function.
 */

var defaultDecorate = () => [];
/**
 * Check if the target is in the editor.
 */


var hasTarget = (editor, target) => {
  return isDOMNode(target) && ReactEditor.hasDOMNode(editor, target);
};
/**
 * Check if the target is editable and in the editor.
 */


var hasEditableTarget = (editor, target) => {
  return isDOMNode(target) && ReactEditor.hasDOMNode(editor, target, {
    editable: true
  });
};
/**
 * Check if the target is inside void and in the editor.
 */


var isTargetInsideVoid = (editor, target) => {
  var slateNode = hasTarget(editor, target) && ReactEditor.toSlateNode(editor, target);
  return Editor.isVoid(editor, slateNode);
};
/**
 * Check if an event is overrided by a handler.
 */


var isEventHandled = (event, handler) => {
  if (!handler) {
    return false;
  }

  handler(event);
  return event.isDefaultPrevented() || event.isPropagationStopped();
};
/**
 * Check if a DOM event is overrided by a handler.
 */


var isDOMEventHandled = (event, handler) => {
  if (!handler) {
    return false;
  }

  handler(event);
  return event.defaultPrevented;
};

/**
 * An auto-incrementing identifier for keys.
 */
var n = 0;
/**
 * A class that keeps track of a key string. We use a full class here because we
 * want to be able to use them as keys in `WeakMap` objects.
 */

class Key {
  constructor() {
    this.id = "".concat(n++);
  }

}

var ReactEditor = {
  /**
   * Find a key for a Slate node.
   */
  findKey(editor, node) {
    var key = NODE_TO_KEY.get(node);

    if (!key) {
      key = new Key();
      NODE_TO_KEY.set(node, key);
    }

    return key;
  },

  /**
   * Find the path of Slate node.
   */
  findPath(editor, node) {
    var path = [];
    var child = node;

    while (true) {
      var parent = NODE_TO_PARENT.get(child);

      if (parent == null) {
        if (Editor.isEditor(child)) {
          return path;
        } else {
          break;
        }
      }

      var i = NODE_TO_INDEX.get(child);

      if (i == null) {
        break;
      }

      path.unshift(i);
      child = parent;
    }

    throw new Error("Unable to find the path for Slate node: ".concat(JSON.stringify(node)));
  },

  /**
   * Check if the editor is focused.
   */
  isFocused(editor) {
    return !!IS_FOCUSED.get(editor);
  },

  /**
   * Check if the editor is in read-only mode.
   */
  isReadOnly(editor) {
    return !!IS_READ_ONLY.get(editor);
  },

  /**
   * Blur the editor.
   */
  blur(editor) {
    var el = ReactEditor.toDOMNode(editor, editor);
    IS_FOCUSED.set(editor, false);

    if (window.document.activeElement === el) {
      el.blur();
    }
  },

  /**
   * Focus the editor.
   */
  focus(editor) {
    var el = ReactEditor.toDOMNode(editor, editor);
    IS_FOCUSED.set(editor, true);

    if (window.document.activeElement !== el) {
      el.focus({
        preventScroll: true
      });
    }
  },

  /**
   * Deselect the editor.
   */
  deselect(editor) {
    var {
      selection
    } = editor;
    var domSelection = window.getSelection();

    if (domSelection && domSelection.rangeCount > 0) {
      domSelection.removeAllRanges();
    }

    if (selection) {
      Transforms.deselect(editor);
    }
  },

  /**
   * Check if a DOM node is within the editor.
   */
  hasDOMNode(editor, target) {
    var options = arguments.length > 2 && arguments[2] !== undefined ? arguments[2] : {};
    var {
      editable = false
    } = options;
    var editorEl = ReactEditor.toDOMNode(editor, editor);
    var targetEl; // COMPAT: In Firefox, reading `target.nodeType` will throw an error if
    // target is originating from an internal "restricted" element (e.g. a
    // stepper arrow on a number input). (2018/05/04)
    // https://github.com/ianstormtaylor/slate/issues/1819

    try {
      targetEl = isDOMElement(target) ? target : target.parentElement;
    } catch (err) {
      if (!err.message.includes('Permission denied to access property "nodeType"')) {
        throw err;
      }
    }

    if (!targetEl) {
      return false;
    }

    return targetEl.closest("[data-slate-editor]") === editorEl && (!editable || targetEl.isContentEditable || !!targetEl.getAttribute('data-slate-zero-width'));
  },

  /**
   * Insert data from a `DataTransfer` into the editor.
   */
  insertData(editor, data) {
    editor.insertData(data);
  },

  /**
   * Sets data from the currently selected fragment on a `DataTransfer`.
   */
  setFragmentData(editor, data) {
    editor.setFragmentData(data);
  },

  /**
   * Find the native DOM element from a Slate node.
   */
  toDOMNode(editor, node) {
    var domNode = Editor.isEditor(node) ? EDITOR_TO_ELEMENT.get(editor) : KEY_TO_ELEMENT.get(ReactEditor.findKey(editor, node));

    if (!domNode) {
      throw new Error("Cannot resolve a DOM node from Slate node: ".concat(JSON.stringify(node)));
    }

    return domNode;
  },

  /**
   * Find a native DOM selection point from a Slate point.
   */
  toDOMPoint(editor, point) {
    var [node] = Editor.node(editor, point.path);
    var el = ReactEditor.toDOMNode(editor, node);
    var domPoint; // If we're inside a void node, force the offset to 0, otherwise the zero
    // width spacing character will result in an incorrect offset of 1

    if (Editor.void(editor, {
      at: point
    })) {
      point = {
        path: point.path,
        offset: 0
      };
    } // For each leaf, we need to isolate its content, which means filtering
    // to its direct text and zero-width spans. (We have to filter out any
    // other siblings that may have been rendered alongside them.)


    var selector = "[data-slate-string], [data-slate-zero-width]";
    var texts = Array.from(el.querySelectorAll(selector));
    var start = 0;

    for (var text of texts) {
      var domNode = text.childNodes[0];

      if (domNode == null || domNode.textContent == null) {
        continue;
      }

      var {
        length
      } = domNode.textContent;
      var attr = text.getAttribute('data-slate-length');
      var trueLength = attr == null ? length : parseInt(attr, 10);
      var end = start + trueLength;

      if (point.offset <= end) {
        var offset = Math.min(length, Math.max(0, point.offset - start));
        domPoint = [domNode, offset];
        break;
      }

      start = end;
    }

    if (!domPoint) {
      throw new Error("Cannot resolve a DOM point from Slate point: ".concat(JSON.stringify(point)));
    }

    return domPoint;
  },

  /**
   * Find a native DOM range from a Slate `range`.
   */
  toDOMRange(editor, range) {
    var {
      anchor,
      focus
    } = range;
    var isBackward = Range.isBackward(range);
    var domAnchor = ReactEditor.toDOMPoint(editor, anchor);
    var domFocus = Range.isCollapsed(range) ? domAnchor : ReactEditor.toDOMPoint(editor, focus);
    var domRange = window.document.createRange();
    var [startNode, startOffset] = isBackward ? domFocus : domAnchor;
    var [endNode, endOffset] = isBackward ? domAnchor : domFocus; // A slate Point at zero-width Leaf always has an offset of 0 but a native DOM selection at
    // zero-width node has an offset of 1 so we have to check if we are in a zero-width node and
    // adjust the offset accordingly.

    var startEl = isDOMElement(startNode) ? startNode : startNode.parentElement;
    var isStartAtZeroWidth = !!startEl.getAttribute('data-slate-zero-width');
    var endEl = isDOMElement(endNode) ? endNode : endNode.parentElement;
    var isEndAtZeroWidth = !!endEl.getAttribute('data-slate-zero-width');
    domRange.setStart(startNode, isStartAtZeroWidth ? 1 : startOffset);
    domRange.setEnd(endNode, isEndAtZeroWidth ? 1 : endOffset);
    return domRange;
  },

  /**
   * Find a Slate node from a native DOM `element`.
   */
  toSlateNode(editor, domNode) {
    var domEl = isDOMElement(domNode) ? domNode : domNode.parentElement;

    if (domEl && !domEl.hasAttribute('data-slate-node')) {
      domEl = domEl.closest("[data-slate-node]");
    }

    var node = domEl ? ELEMENT_TO_NODE.get(domEl) : null;

    if (!node) {
      throw new Error("Cannot resolve a Slate node from DOM node: ".concat(domEl));
    }

    return node;
  },

  /**
   * Get the target range from a DOM `event`.
   */
  findEventRange(editor, event) {
    if ('nativeEvent' in event) {
      event = event.nativeEvent;
    }

    var {
      clientX: x,
      clientY: y,
      target
    } = event;

    if (x == null || y == null) {
      throw new Error("Cannot resolve a Slate range from a DOM event: ".concat(event));
    }

    var node = ReactEditor.toSlateNode(editor, event.target);
    var path = ReactEditor.findPath(editor, node); // If the drop target is inside a void node, move it into either the
    // next or previous node, depending on which side the `x` and `y`
    // coordinates are closest to.

    if (Editor.isVoid(editor, node)) {
      var rect = target.getBoundingClientRect();
      var isPrev = editor.isInline(node) ? x - rect.left < rect.left + rect.width - x : y - rect.top < rect.top + rect.height - y;
      var edge = Editor.point(editor, path, {
        edge: isPrev ? 'start' : 'end'
      });
      var point = isPrev ? Editor.before(editor, edge) : Editor.after(editor, edge);

      if (point) {
        var _range = Editor.range(editor, point);

        return _range;
      }
    } // Else resolve a range from the caret position where the drop occured.


    var domRange;
    var {
      document
    } = window; // COMPAT: In Firefox, `caretRangeFromPoint` doesn't exist. (2016/07/25)

    if (document.caretRangeFromPoint) {
      domRange = document.caretRangeFromPoint(x, y);
    } else {
      var position = document.caretPositionFromPoint(x, y);

      if (position) {
        domRange = document.createRange();
        domRange.setStart(position.offsetNode, position.offset);
        domRange.setEnd(position.offsetNode, position.offset);
      }
    }

    if (!domRange) {
      throw new Error("Cannot resolve a Slate range from a DOM event: ".concat(event));
    } // Resolve a Slate range from the DOM range.


    var range = ReactEditor.toSlateRange(editor, domRange);
    return range;
  },

  /**
   * Find a Slate point from a DOM selection's `domNode` and `domOffset`.
   */
  toSlatePoint(editor, domPoint) {
    var [nearestNode, nearestOffset] = normalizeDOMPoint(domPoint);
    var parentNode = nearestNode.parentNode;
    var textNode = null;
    var offset = 0;

    if (parentNode) {
      var voidNode = parentNode.closest('[data-slate-void="true"]');
      var leafNode = parentNode.closest('[data-slate-leaf]');
      var domNode = null; // Calculate how far into the text node the `nearestNode` is, so that we
      // can determine what the offset relative to the text node is.

      if (leafNode) {
        textNode = leafNode.closest('[data-slate-node="text"]');
        var range = window.document.createRange();
        range.setStart(textNode, 0);
        range.setEnd(nearestNode, nearestOffset);
        var contents = range.cloneContents();
        var removals = [...contents.querySelectorAll('[data-slate-zero-width]'), ...contents.querySelectorAll('[contenteditable=false]')];
        removals.forEach(el => {
          el.parentNode.removeChild(el);
        }); // COMPAT: Edge has a bug where Range.prototype.toString() will
        // convert \n into \r\n. The bug causes a loop when slate-react
        // attempts to reposition its cursor to match the native position. Use
        // textContent.length instead.
        // https://developer.microsoft.com/en-us/microsoft-edge/platform/issues/10291116/

        offset = contents.textContent.length;
        domNode = textNode;
      } else if (voidNode) {
        // For void nodes, the element with the offset key will be a cousin, not an
        // ancestor, so find it by going down from the nearest void parent.
        leafNode = voidNode.querySelector('[data-slate-leaf]');
        textNode = leafNode.closest('[data-slate-node="text"]');
        domNode = leafNode;
        offset = domNode.textContent.length;
      } // COMPAT: If the parent node is a Slate zero-width space, editor is
      // because the text node should have no characters. However, during IME
      // composition the ASCII characters will be prepended to the zero-width
      // space, so subtract 1 from the offset to account for the zero-width
      // space character.


      if (domNode && offset === domNode.textContent.length && parentNode.hasAttribute('data-slate-zero-width')) {
        offset--;
      }
    }

    if (!textNode) {
      throw new Error("Cannot resolve a Slate point from DOM point: ".concat(domPoint));
    } // COMPAT: If someone is clicking from one Slate editor into another,
    // the select event fires twice, once for the old editor's `element`
    // first, and then afterwards for the correct `element`. (2017/03/03)


    var slateNode = ReactEditor.toSlateNode(editor, textNode);
    var path = ReactEditor.findPath(editor, slateNode);
    return {
      path,
      offset
    };
  },

  /**
   * Find a Slate range from a DOM range or selection.
   */
  toSlateRange(editor, domRange) {
    var el = domRange instanceof Selection ? domRange.anchorNode : domRange.startContainer;
    var anchorNode;
    var anchorOffset;
    var focusNode;
    var focusOffset;
    var isCollapsed;

    if (el) {
      if (domRange instanceof Selection) {
        anchorNode = domRange.anchorNode;
        anchorOffset = domRange.anchorOffset;
        focusNode = domRange.focusNode;
        focusOffset = domRange.focusOffset;
        isCollapsed = domRange.isCollapsed;
      } else {
        anchorNode = domRange.startContainer;
        anchorOffset = domRange.startOffset;
        focusNode = domRange.endContainer;
        focusOffset = domRange.endOffset;
        isCollapsed = domRange.collapsed;
      }
    }

    if (anchorNode == null || focusNode == null || anchorOffset == null || focusOffset == null) {
      throw new Error("Cannot resolve a Slate range from DOM range: ".concat(domRange));
    }

    var anchor = ReactEditor.toSlatePoint(editor, [anchorNode, anchorOffset]);
    var focus = isCollapsed ? anchor : ReactEditor.toSlatePoint(editor, [focusNode, focusOffset]);
    return {
      anchor,
      focus
    };
  }

};

/**
 * A React context for sharing the `focused` state of the editor.
 */

var FocusedContext = createContext(false);
/**
 * Get the current `focused` state of the editor.
 */

var useFocused = () => {
  return useContext(FocusedContext);
};

/**
 * A wrapper around the provider to handle `onChange` events, because the editor
 * is a mutable singleton so it won't ever register as "changed" otherwise.
 */

var Slate = props => {
  var {
    editor,
    children,
    onChange,
    value
  } = props,
      rest = _objectWithoutProperties(props, ["editor", "children", "onChange", "value"]);

  var [key, setKey] = useState(0);
  var context = useMemo(() => {
    editor.children = value;
    Object.assign(editor, rest);
    return [editor];
  }, [key, value, ...Object.values(rest)]);
  var onContextChange = useCallback(() => {
    onChange(editor.children);
    setKey(key + 1);
  }, [key, onChange]);
  EDITOR_TO_ON_CHANGE.set(editor, onContextChange);
  useEffect(() => {
    return () => {
      EDITOR_TO_ON_CHANGE.set(editor, () => {});
    };
  }, []);
  return React.createElement(SlateContext.Provider, {
    value: context
  }, React.createElement(EditorContext.Provider, {
    value: editor
  }, React.createElement(FocusedContext.Provider, {
    value: ReactEditor.isFocused(editor)
  }, children)));
};

/**
 * `withReact` adds React and DOM specific behaviors to the editor.
 */

var withReact = editor => {
  var e = editor;
  var {
    apply,
    onChange
  } = e;

  e.apply = op => {
    var matches = [];

    switch (op.type) {
      case 'insert_text':
      case 'remove_text':
      case 'set_node':
        {
          for (var [node, path] of Editor.levels(e, {
            at: op.path
          })) {
            var key = ReactEditor.findKey(e, node);
            matches.push([path, key]);
          }

          break;
        }

      case 'insert_node':
      case 'remove_node':
      case 'merge_node':
      case 'split_node':
        {
          for (var [_node, _path] of Editor.levels(e, {
            at: Path.parent(op.path)
          })) {
            var _key = ReactEditor.findKey(e, _node);

            matches.push([_path, _key]);
          }

          break;
        }
    }

    apply(op);

    for (var [_path2, _key2] of matches) {
      var [_node2] = Editor.node(e, _path2);
      NODE_TO_KEY.set(_node2, _key2);
    }
  };

  e.setFragmentData = data => {
    var {
      selection
    } = e;

    if (!selection) {
      return;
    }

    var [start, end] = Range.edges(selection);
    var startVoid = Editor.void(e, {
      at: start.path
    });
    var endVoid = Editor.void(e, {
      at: end.path
    });

    if (Range.isCollapsed(selection) && !startVoid) {
      return;
    } // Create a fake selection so that we can add a Base64-encoded copy of the
    // fragment to the HTML, to decode on future pastes.


    var domRange = ReactEditor.toDOMRange(e, selection);
    var contents = domRange.cloneContents();
    var attach = contents.childNodes[0]; // Make sure attach is non-empty, since empty nodes will not get copied.

    contents.childNodes.forEach(node => {
      if (node.textContent && node.textContent.trim() !== '') {
        attach = node;
      }
    }); // COMPAT: If the end node is a void node, we need to move the end of the
    // range from the void node's spacer span, to the end of the void node's
    // content, since the spacer is before void's content in the DOM.

    if (endVoid) {
      var [voidNode] = endVoid;
      var r = domRange.cloneRange();
      var domNode = ReactEditor.toDOMNode(e, voidNode);
      r.setEndAfter(domNode);
      contents = r.cloneContents();
    } // COMPAT: If the start node is a void node, we need to attach the encoded
    // fragment to the void node's content node instead of the spacer, because
    // attaching it to empty `<div>/<span>` nodes will end up having it erased by
    // most browsers. (2018/04/27)


    if (startVoid) {
      attach = contents.querySelector('[data-slate-spacer]');
    } // Remove any zero-width space spans from the cloned DOM so that they don't
    // show up elsewhere when pasted.


    Array.from(contents.querySelectorAll('[data-slate-zero-width]')).forEach(zw => {
      var isNewline = zw.getAttribute('data-slate-zero-width') === 'n';
      zw.textContent = isNewline ? '\n' : '';
    }); // Set a `data-slate-fragment` attribute on a non-empty node, so it shows up
    // in the HTML, and can be used for intra-Slate pasting. If it's a text
    // node, wrap it in a `<span>` so we have something to set an attribute on.

    if (isDOMText(attach)) {
      var span = document.createElement('span'); // COMPAT: In Chrome and Safari, if we don't add the `white-space` style
      // then leading and trailing spaces will be ignored. (2017/09/21)

      span.style.whiteSpace = 'pre';
      span.appendChild(attach);
      contents.appendChild(span);
      attach = span;
    }

    var fragment = e.getFragment();
    var string = JSON.stringify(fragment);
    var encoded = window.btoa(encodeURIComponent(string));
    attach.setAttribute('data-slate-fragment', encoded);
    data.setData('application/x-slate-fragment', encoded); // Add the content to a <div> so that we can get its inner HTML.

    var div = document.createElement('div');
    div.appendChild(contents);
    div.setAttribute('hidden', 'true');
    document.body.appendChild(div);
    data.setData('text/html', div.innerHTML);
    data.setData('text/plain', getPlainText(div));
    document.body.removeChild(div);
  };

  e.insertData = data => {
    var fragment = data.getData('application/x-slate-fragment');

    if (fragment) {
      var decoded = decodeURIComponent(window.atob(fragment));
      var parsed = JSON.parse(decoded);
      Transforms.insertFragment(e, parsed);
      return;
    }

    var text = data.getData('text/plain');

    if (text) {
      var lines = text.split(/\r\n|\r|\n/);
      var split = false;

      for (var line of lines) {
        if (split) {
          Transforms.splitNodes(e, {
            always: true
          });
        }

        Transforms.insertText(e, line);
        split = true;
      }
    }
  };

  e.onChange = () => {
    // COMPAT: React doesn't batch `setState` hook calls, which means that the
    // children and selection can get out of sync for one render pass. So we
    // have to use this unstable API to ensure it batches them. (2019/12/03)
    // https://github.com/facebook/react/issues/14259#issuecomment-439702367
    ReactDOM.unstable_batchedUpdates(() => {
      var onContextChange = EDITOR_TO_ON_CHANGE.get(e);

      if (onContextChange) {
        onContextChange();
      }

      onChange();
    });
  };

  return e;
};

export { DefaultElement, DefaultLeaf, Editable, ReactEditor, Slate, useEditor, useFocused, useReadOnly, useSelected, useSlate, withReact };
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