var _createClass = function () { 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, descriptor.key, descriptor); } } return function (Constructor, protoProps, staticProps) { if (protoProps) defineProperties(Constructor.prototype, protoProps); if (staticProps) defineProperties(Constructor, staticProps); return Constructor; }; }();

function _classCallCheck(instance, Constructor) { if (!(instance instanceof Constructor)) { throw new TypeError("Cannot call a class as a function"); } }

import { arrayEach } from './helpers/array';
import { objectEach } from './helpers/object';

/**
 * @description
 * Handsontable events are the common interface that function in 2 ways: as __callbacks__ and as __hooks__.
 *
 * @example
 *
 * ```js
 * // Using events as callbacks:
 * ...
 * var hot1 = new Handsontable(document.getElementById('example1'), {
 *   afterChange: function(changes, source) {
 *     $.ajax({
 *       url: "save.php',
 *       data: change
 *     });
 *   }
 * });
 * ...
 * ```
 *
 * ```js
 * // Using events as plugin hooks:
 * ...
 * var hot1 = new Handsontable(document.getElementById('example1'), {
 *   myPlugin: true
 * });
 *
 * var hot2 = new Handsontable(document.getElementById('example2'), {
 *   myPlugin: false
 * });
 *
 * // global hook
 * Handsontable.hooks.add('afterChange', function() {
 *   // Fired twice - for hot1 and hot2
 *   if (this.getSettings().myPlugin) {
 *     // function body - will only run for hot1
 *   }
 * });
 *
 * // local hook (has same effect as a callback)
 * hot2.addHook('afterChange', function() {
 *   // function body - will only run in #example2
 * });
 * ```
 * ...
 */

// @TODO: Move plugin description hooks to plugin?
var REGISTERED_HOOKS = [
/**
 * Callback fired after resetting a cell's meta.
 *
 * @event Hooks#afterCellMetaReset
 * @since 0.11
 */
'afterCellMetaReset',

/**
 * @description
 * Callback fired after one or more cells has been changed. Its main use case is to save the input.
 *
 * __Note:__ For performance reasons, the `changes` array is null for `"loadData"` source.
 *
 * @event Hooks#afterChange
 * @param {Array} changes 2D array containing information about each of the edited cells `[[row, prop, oldVal, newVal], ...]`.
 * @param {String} [source] String that identifies source of hook call
 *                          ([list of all available sources]{@link http://docs.handsontable.com/tutorial-using-callbacks.html#page-source-definition}).
 */
'afterChange',

/**
 * @description
 * Fired after observing changes.
 *
 * @event Hooks#afterChangesObserved
 */
'afterChangesObserved',

/**
 * @description
 * Fired after setting up the Context Menu's default options. These options are a collection which user can select by setting
 * an array of keys or an array of objects in `contextMenu` option.
 *
 * @event Hooks#afterContextMenuDefaultOptions
 * @param {Array} predefinedItems Array of objects containing information about the pre-defined Context Menu items.
 */
'afterContextMenuDefaultOptions',

/**
 * @description
 * Fired before setting up the Context Menu's items but after filtering these options by user (`contextMenu` option). This hook
 * can by helpful to determine if user use specified menu item or to set up one of the menu item to by always visible.
 *
 * @event Hooks#beforeContextMenuSetItems
 * @param {Array} menuItems Array of objects containing information about to generated Context Menu items.
 */
'beforeContextMenuSetItems',

/**
 * @description
 * Fired after setting up the Context Menu's default options. These options are a collection which user can select by setting
 * an array of keys or an array of objects in `contextMenu` option.
 *
 * @pro
 * @event Hooks#afterDropdownMenuDefaultOptions
 * @param {Array} predefinedItems Array of objects containing information about the pre-defined Context Menu items.
 */
'afterDropdownMenuDefaultOptions',

/**
 * @description
 * Fired before setting up the Dropdown Menu's items but after filtering these options by user (`dropdownMenu` option). This hook
 * can by helpful to determine if user use specified menu item or to set up one of the menu item to by always visible.
 *
 * @pro
 * @event Hooks#beforeDropdownMenuSetItems
 * @param {Array} menuItems Array of objects containing information about to generated Dropdown Menu items.
 */
'beforeDropdownMenuSetItems',

/**
 * @description
 * Fired after hiding the Context Menu.
 *
 * @event Hooks#afterContextMenuHide
 * @param {Object} context The Context menu instance.
 */
'afterContextMenuHide',

/**
 * @description
 * Fired after opening the Context Menu.
 *
 * @event Hooks#afterContextMenuShow
 * @param {Object} context The Context Menu instance.
 */
'afterContextMenuShow',

/**
 * @description
 * Fired after reaching the copy limit while copying data.
 *
 * @event Hooks#afterCopyLimit
 * @param {Number} selectedRows Count of selected copyable rows.
 * @param {Number} selectedColumns Count of selected copyable columns.
 * @param {Number} copyRowsLimit Current copy rows limit.
 * @param {Number} copyColumnsLimit Current copy columns limit.
 */
'afterCopyLimit',

/**
 * Callback is fired before a new column was created.
 *
 * @since 0.28.0
 * @event Hooks#beforeCreateCol
 * @param {Number} index Represents the index of first newly created column in the data source array.
 * @param {Number} amount Number of newly created columns in the data source array.
 * @param {String} [source] String that identifies source of hook call
 *                          ([list of all available sources]{@link http://docs.handsontable.com/tutorial-using-callbacks.html#page-source-definition}).
 */
'beforeCreateCol',

/**
 * Callback is fired after a new column was created.
 *
 * @event Hooks#afterCreateCol
 * @param {Number} index Represents the index of first newly created column in the data source array.
 * @param {Number} amount Number of newly created columns in the data source array.
 * @param {String} [source] String that identifies source of hook call
 *                          ([list of all available sources]{@link http://docs.handsontable.com/tutorial-using-callbacks.html#page-source-definition}).
 */
'afterCreateCol',

/**
 * Callback is fired before a new row was created.
 *
 * @since 0.28.0
 * @event Hooks#beforeCreateRow
 * @param {Number} index Represents the index of first newly created row in the data source array.
 * @param {Number} amount Number of newly created rows in the data source array.
 * @param {String} [source] String that identifies source of hook call
 *                          ([list of all available sources]{@link http://docs.handsontable.com/tutorial-using-callbacks.html#page-source-definition}).
 */
'beforeCreateRow',

/**
 * Callback is fired after a new row was created.
 *
 * @event Hooks#afterCreateRow
 * @param {Number} index Represents the index of first newly created row in the data source array.
 * @param {Number} amount Number of newly created rows in the data source array.
 * @param {String} [source] String that identifies source of hook call
 *                          ([list of all available sources]{@link http://docs.handsontable.com/tutorial-using-callbacks.html#page-source-definition}).
 */
'afterCreateRow',

/**
 * Fired after the current cell is deselected.
 *
 * @event Hooks#afterDeselect
 */
'afterDeselect',

/**
 * Fired after destroying the Handsontable instance.
 *
 * @event Hooks#afterDestroy
 */
'afterDestroy',

/**
 * Fired on a `keydown` event on the document body.
 *
 * @event Hooks#afterDocumentKeyDown
 * @param {Event} event A `keydown` event.
 */
'afterDocumentKeyDown',

/**
 * Callback fired after getting the cell settings.
 *
 * @event Hooks#afterGetCellMeta
 * @param {Number} row Row index.
 * @param {Number} col Column index.
 * @param {Object} cellProperties Object containing the cell properties.
 */
'afterGetCellMeta',

/**
 * Callback fired after retrieving information about a column header and appending it to the table header.
 *
 * @event Hooks#afterGetColHeader
 * @param {Number} col Column index.
 * @param {Element} TH Header's TH element.
 */
'afterGetColHeader',

/**
 * Callback fired after retrieving information about a column header and appending it to the table header.
 *
 * @event Hooks#afterGetRowHeader
 * @param {Number} row Row index.
 * @param {Element} TH Header's TH element.
 */
'afterGetRowHeader',

/**
 * Callback fired after Handsontable instance is initiated.
 *
 * @event Hooks#afterInit
 */
'afterInit',

/**
 * Callback fired after new data is loaded (by `loadData` method) into the data source array.
 *
 * @event Hooks#afterLoadData
 * @param {Boolean} firstTime flag that determines whether the data has been loaded during the initialization.
 */
'afterLoadData',

/**
 * Fired after a scroll event, which is identified as a momentum scroll (e.g. on an iPad).
 *
 * @event Hooks#afterMomentumScroll
 */
'afterMomentumScroll',

/**
 * Fired after a `mousedown` event is triggered on the cell corner (the drag handle).
 *
 * @event Hooks#afterOnCellCornerMouseDown
 * @since 0.11
 * @param {Object} event `mousedown` event object.
 */
'afterOnCellCornerMouseDown',

/**
 * Fired after a `dblclick` event is triggered on the cell corner (the drag handle).
 *
 * @event Hooks#afterOnCellCornerDblClick
 * @since 0.30.0
 * @param {Object} event `dblclick` event object.
 */
'afterOnCellCornerDblClick',

/**
 * Callback fired after clicking on a cell or row/column header.
 * In case the row/column header was clicked, the index is negative.
 * For example clicking on the row header of cell (0, 0) results with `afterOnCellMouseDown` called
 * with coords `{row: 0, col: -1}`.
 *
 * @event Hooks#afterOnCellMouseDown
 * @since 0.11
 * @param {Object} event `mousedown` event object.
 * @param {Object} coords Coordinates object containing the row and column indexes of the clicked cell.
 * @param {Element} TD Cell's TD (or TH) element.
 */
'afterOnCellMouseDown',

/**
 * Callback fired after hovering a cell or row/column header with the mouse cursor.
 * In case the row/column header was hovered, the index is negative.
 * For example, hovering over the row header of cell (0, 0) results with `afterOnCellMouseOver` called
 * with coords `{row: 0, col: -1}`.
 *
 * @event Hooks#afterOnCellMouseOver
 * @since 0.11
 * @param {Object} event `mouseover` event object.
 * @param {Object} coords Hovered cell's coordinate object.
 * @param {Element} TD Cell's TD (or TH) element.
 */
'afterOnCellMouseOver',

/**
 * Callback fired after leaving a cell or row/column header with the mouse cursor.
 *
 * @event Hooks#afterOnCellMouseOver
 * @since 0.31.1
 * @param {Object} event `mouseout` event object.
 * @param {Object} coords Leaved cell's coordinate object.
 * @param {Element} TD Cell's TD (or TH) element.
 */
'afterOnCellMouseOut',

/**
 * Callback is fired when one or more columns are removed.
 *
 * @event Hooks#afterRemoveCol
 * @param {Number} index Is an index of starter column.
 * @param {Number} amount Is an amount of removed columns.
 */
'afterRemoveCol',

/**
 * Callback is fired when one or more rows are removed.
 *
 * @event Hooks#afterRemoveRow
 * @param {Number} index Is an index of starter row.
 * @param {Number} amount Is an amount of removed rows.
 */
'afterRemoveRow',

/**
 * Callback fired after the Handsontable table is rendered.
 *
 * @event Hooks#afterRender
 * @param {Boolean} isForced Is `true` if rendering was triggered by a change of settings or data; or `false` if
 *                           rendering was triggered by scrolling or moving selection.
 */
'afterRender',

/**
 * Fired before starting rendering the cell.
 *
 * @event Hooks#beforeRenderer
 * @since 0.24.2
 * @param {Element} TD Currently rendered cell's TD element.
 * @param {Number} row Row index.
 * @param {Number} col Column index.
 * @param {String|Number} prop Column property name or a column index, if datasource is an array of arrays.
 * @param {String} value Value of the rendered cell.
 * @param {Object} cellProperties Object containing the cell's properties.
 */
'beforeRenderer',

/**
 * Fired after finishing rendering the cell (after the renderer finishes).
 *
 * @event Hooks#afterRenderer
 * @since 0.11.0
 * @param {Element} TD Currently rendered cell's TD element.
 * @param {Number} row Row index.
 * @param {Number} col Column index.
 * @param {String|Number} prop Column property name or a column index, if datasource is an array of arrays.
 * @param {String} value Value of the rendered cell.
 * @param {Object} cellProperties Object containing the cell's properties.
 */
'afterRenderer',

/**
 * Fired after the horizontal scroll event.
 *
 * @event Hooks#afterScrollHorizontally
 * @since 0.11
 */
'afterScrollHorizontally',

/**
 * Fired after the vertical scroll event.
 *
 * @event Hooks#afterScrollVertically
 * @since 0.11
 */
'afterScrollVertically',

/**
 * Callback fired after one or more cells are selected (e.g. during mouse move).
 *
 * @event Hooks#afterSelection
 * @param {Number} r Selection start row index.
 * @param {Number} c Selection start column index.
 * @param {Number} r2 Selection end row index.
 * @param {Number} c2 Selection end column index.
 * @param {Object} preventScrolling Object with `value` property where its value change will be observed.
 *    * @example
 * ```js
 * handsontable({
 *   afterSelection: function (r, c, r2, c2, preventScrolling) {
 *     // setting if prevent scrolling after selection
 *
 *     preventScrolling.value = true;
 *   }
 * })
 * ```
 */
'afterSelection',

/**
 * Callback fired after one or more cells are selected. The `p` argument represents the source object property name instead of the column number.
 *
 * @event Hooks#afterSelectionByProp
 * @param {Number} r Selection start row index.
 * @param {String} p Selection start data source object property name.
 * @param {Number} r2 Selection end row index.
 * @param {String} p2 Selection end data source object property name.
 * @param {Object} preventScrolling Object with `value` property where its value change will be observed.
 *    * @example
 * ```js
 * handsontable({
 *   afterSelectionByProp: function (r, c, r2, c2, preventScrolling) {
 *     // setting if prevent scrolling after selection
 *
 *     preventScrolling.value = true;
 *   }
 * })
 * ```
 */
'afterSelectionByProp',

/**
 * Callback fired after one or more cells are selected (e.g. on mouse up).
 *
 * @event Hooks#afterSelectionEnd
 * @param {Number} r Selection start row index.
 * @param {Number} c Selection start column index.
 * @param {Number} r2 Selection end row index.
 * @param {Number} c2 Selection end column index.
 */
'afterSelectionEnd',

/**
 * Callback fired after one or more cells are selected (e.g. on mouse up). The `p` argument represents the data source object
 * property name instead of the column number.
 *
 * @event Hooks#afterSelectionEndByProp
 * @param {Number} r Selection start row index.
 * @param {String} p Selection start data source object property index.
 * @param {Number} r2 Selection end row index.
 * @param {String} p2 Selection end data source object property index.
 */
'afterSelectionEndByProp',

/**
 * Called after cell meta is changed.
 *
 * @event Hooks#afterSetCellMeta
 * @since 0.11.0
 * @param {Number} row Row index.
 * @param {Number} col Column index.
 * @param {String} key The updated meta key.
 * @param {*} value The updated meta value.
 */
'afterSetCellMeta',

/**
 * Called after cell data was changed.
 *
 * @event Hooks#afterSetDataAtCell
 * @since 0.28.0
 * @param {Array} changes An array of changes in format `[[row, col, oldValue, value], ...]`.
 * @param {String} [source] String that identifies source of hook call
 *                          ([list of all available sources]{@link http://docs.handsontable.com/tutorial-using-callbacks.html#page-source-definition}).
 */
'afterSetDataAtCell',

/**
 * Called after cell data was changed.
 *
 * @event Hooks#afterSetDataAtRowProp
 * @since 0.28.0
 * @param {Array} changes An array of changes in format `[[row, prop, oldValue, value], ...]`.
 * @param {String} [source] String that identifies source of hook call
 *                          ([list of all available sources]{@link http://docs.handsontable.com/tutorial-using-callbacks.html#page-source-definition}).
 */
'afterSetDataAtRowProp',

/**
 * Fired after calling the `updateSettings` method.
 *
 * @event Hooks#afterUpdateSettings
 */
'afterUpdateSettings',

/**
 * @description
 * A plugin hook executed after validator function, only if validator function is defined.
 * Validation result is the first parameter. This can be used to determinate if validation passed successfully or not.
 *
 * __Returning false from the callback will mark the cell as invalid.__
 *
 * @event Hooks#afterValidate
 * @since 0.9.5
 * @param {Boolean} isValid `true` if valid, `false` if not.
 * @param {*} value The value in question.
 * @param {Number} row Row index.
 * @param {String|Number} prop Property name / column index.
 * @param {String} [source] String that identifies source of hook call
 *                          ([list of all available sources]{@link http://docs.handsontable.com/tutorial-using-callbacks.html#page-source-definition}).
 */
'afterValidate',

/**
 * Fired before populating the data in the autofill feature.
 *
 * @event Hooks#beforeAutofill
 * @param {Object} start Object containing information about first filled cell: `{row: 2, col: 0}`.
 * @param {Object} end Object containing information about last filled cell: `{row: 4, col: 1}`.
 * @param {Array} data 2D array containing information about fill pattern: `[["1', "Ted"], ["1', "John"]]`.
 */
'beforeAutofill',

/**
 * Fired before aligning the cell contents.
 *
 * @event Hooks#beforeCellAlignment
 * @param stateBefore
 * @param range
 * @param {String} type Type of the alignment - either `horizontal` or `vertical`
 * @param {String} alignmentClass String defining the alignment class added to the cell.
 * Possible values:
 * * `htLeft`,
 * * `htCenter`,
 * * `htRight`,
 * * `htJustify`
 * for horizontal alignment,
 *
 *
 * * `htTop`,
 * * `htMiddle`,
 * * `htBottom`
 * for vertical alignment.
 */
'beforeCellAlignment',

/**
 * Callback fired before one or more cells is changed. Its main purpose is to alter changes silently before input.
 *
 * @event Hooks#beforeChange
 * @param {Array} changes 2D array containing information about each of the edited cells.
 * @param {String} [source] String that identifies source of hook call
 *                          ([list of all available sources]{@link http://docs.handsontable.com/tutorial-using-callbacks.html#page-source-definition}).
 * @example
 * ```js
 * // To disregard a single change, set changes[i] to null or remove it from array using changes.splice(i, 1).
 * ...
 * new Handsontable(document.getElementById('example'), {
 *   beforeChange: function(changes, source) {
 *     // [[row, prop, oldVal, newVal], ...]
 *     changes[0] = null;
 *   }
 * });
 * ...
 *
 * // To alter a single change, overwrite the desired value to changes[i][3].
 * ...
 * new Handsontable(document.getElementById('example'), {
 *   beforeChange: function(changes, source) {
 *     // [[row, prop, oldVal, newVal], ...]
 *     changes[0][3] = 10;
 *   }
 * });
 * ...
 *
 * // To cancel all edit, return false from the callback or set array length to 0 (changes.length = 0).
 * ...
 * new Handsontable(document.getElementById('example'), {
 *   beforeChange: function(changes, source) {
 *     // [[row, prop, oldVal, newVal], ...]
 *     return false;
 *   }
 * });
 * ...
 * ```
 */
'beforeChange',

/**
 * Fired right before rendering the changes.
 *
 * @event Hooks#beforeChangeRender
 * @since 0.11
 * @param {Array} changes Array in form of [row, prop, oldValue, newValue].
 * @param {String} [source] String that identifies source of hook call
 *                          ([list of all available sources]{@link http://docs.handsontable.com/tutorial-using-callbacks.html#page-source-definition}).
 */
'beforeChangeRender',

/**
 * Fired before drawing the borders.
 *
 * @event Hooks#beforeDrawBorders
 * @param {Array} corners Array specifying the current selection borders.
 * @param {String} borderClassName Specifies the border class name.
 */
'beforeDrawBorders',

/**
 * Callback fired before getting cell settings.
 *
 * @event Hooks#beforeGetCellMeta
 * @param {Number} row Row index.
 * @param {Number} col Column index.
 * @param {Object} cellProperties Object containing the cell's properties.
 */
'beforeGetCellMeta',

/**
 * @description
 * Callback fired before Handsontable instance is initiated.
 *
 * @event Hooks#beforeInit
 */
'beforeInit',

/**
 * Callback fired before Walkontable instance is initiated.
 *
 * @since 0.11
 * @event Hooks#beforeInitWalkontable
 * @param {Object} walkontableConfig Walkontable configuration object.
 */
'beforeInitWalkontable',

/**
 * Callback fired before keydown event is handled. It can be used to overwrite default key bindings.
 * Caution - in your `beforeKeyDown` handler you need to call `event.stopImmediatePropagation()` to prevent default key behavior.
 *
 * @event Hooks#beforeKeyDown
 * @since 0.9.0
 * @param {Event} event Original DOM event.
 */
'beforeKeyDown',

/**
 * Fired after the user clicked a cell, but before all the calculations related with it.
 *
 * @event Hooks#beforeOnCellMouseDown
 * @param {Event} event The `mousedown` event object.
 * @param {CellCoords} coords CellCoords object containing the coordinates of the clicked cell.
 * @param {Element} TD TD element.
 */
'beforeOnCellMouseDown',

/**
 * Fired after the user moved cursor over a cell, but before all the calculations related with it.
 *
 * @event Hooks#beforeOnCellMouseOver
 * @param {Event} event The `mouseover` event object.
 * @param {CellCoords} coords CellCoords object containing the coordinates of the clicked cell.
 * @param {Element} TD TD element.
 * @param {Object} blockCalculations Contain keys 'row' and 'column' with boolean value.
 */
'beforeOnCellMouseOver',

/**
 * Fired after the user moved cursor out from a cell, but before all the calculations related with it.
 *
 * @event Hooks#beforeOnCellMouseOut
 * @since 0.31.1
 * @param {Event} event The `mouseout` event object.
 * @param {WalkontableCellCoords} coords WalkontableCellCoords object containing the coordinates of the leaved cell.
 * @param {Element} TD TD element.
 */
'beforeOnCellMouseOut',

/**
 * Callback is fired when one or more columns are about to be removed.
 *
 * @event Hooks#beforeRemoveCol
 * @param {Number} index Index of starter column.
 * @param {Number} amount Amount of columns to be removed.
 * @param {Array} [logicalCols] Consists of logical indexes of processed columns.
 */
'beforeRemoveCol',

/**
 * Callback is fired when one or more rows are about to be removed.
 *
 * @event Hooks#beforeRemoveRow
 * @param {Number} index Index of starter column.
 * @param {Number} amount Amount of columns to be removed.
 * @param {Array} [logicalRows] Consists of logical indexes of processed rows.
 */
'beforeRemoveRow',

/**
 * Callback fired before Handsontable table is rendered.
 *
 * @event Hooks#beforeRender
 * @param {Boolean} isForced If `true` rendering was triggered by a change of settings or data; or `false` if
 *                           rendering was triggered by scrolling or moving selection.
 */
'beforeRender',

/**
 * Callback fired before setting range is started.
 *
 * @event Hooks#beforeSetRangeStart
 * @param {Array} coords CellCoords array.
 */
'beforeSetRangeStart',

/**
 * Callback fired before setting range is ended.
 *
 * @event Hooks#beforeSetRangeEnd
 * @param {Array} coords CellCoords array.
 */
'beforeSetRangeEnd',

/**
 * Fired before the logic of handling a touch scroll, when user started scrolling on a touch-enabled device.
 *
 * @event Hooks#beforeTouchScroll
 */
'beforeTouchScroll',

/**
 * @description
 * A plugin hook executed before validator function, only if validator function is defined.
 * This can be used to manipulate the value of changed cell before it is applied to the validator function.
 *
 * __Notice:__ this will not affect values of changes. This will change value ONLY for validation!
 *
 * @event Hooks#beforeValidate
 * @since 0.9.5
 * @param {*} value Value of the cell.
 * @param {Number} row Row index.
 * @param {String|Number} prop Property name / column index.
 * @param {String} [source] String that identifies source of hook call
 *                          ([list of all available sources]{@link http://docs.handsontable.com/tutorial-using-callbacks.html#page-source-definition}).
 */
'beforeValidate',

/**
 * Callback fired before cell value is rendered into the DOM (through renderer function).
 *
 * @event Hooks#beforeValueRender
 * @since 0.29.0
 * @param {*} value Cell value to render.
 */
'beforeValueRender',

/**
 * Callback fired after Handsontable instance is constructed (via `new` operator).
 *
 * @event Hooks#construct
 * @since 0.16.1
 */
'construct',

/**
 * Callback fired after Handsontable instance is initiated but before table is rendered.
 *
 * @event Hooks#init
 * @since 0.16.1
 */
'init',

/**
 * Fired when a column index is about to be modified by a callback function.
 *
 * @event Hooks#modifyCol
 * @since 0.11
 * @param {Number} col Column index.
 */
'modifyCol',

/**
 * Fired when a column index is about to be de-modified by a callback function.
 *
 * @event Hooks#unmodifyCol
 * @since 0.23.0
 * @param {Number} col Column index.
 */
'unmodifyCol',

/**
 * Fired when a row index is about to be de-modified by a callback function.
 *
 * @event Hooks#unmodifyRow
 * @since 0.26.2
 * @param {Number} row Logical row index.
 */
'unmodifyRow',
/**
 * Fired when a column header index is about to be modified by a callback function.
 *
 * @event Hooks#modifyColHeader
 * @since 0.20.0
 * @param {Number} column Column header index.
 */
'modifyColHeader',

/**
 * Fired when a column width is about to be modified by a callback function.
 *
 * @event Hooks#modifyColWidth
 * @since 0.11
 * @param {Number} width Current column width.
 * @param {Number} col Column index.
 */
'modifyColWidth',

/**
 * Fired when a row index is about to be modified by a callback function.
 *
 * @event Hooks#modifyRow
 * @since 0.11
 * @param {Number} row Row index.
 */
'modifyRow',

/**
 * Fired when a row header index is about to be modified by a callback function.
 *
 * @event Hooks#modifyRowHeader
 * @since 0.20.0
 * @param {Number} row Row header index.
 */
'modifyRowHeader',

/**
 * Fired when a row height is about to be modified by a callback function.
 *
 * @event Hooks#modifyRowHeight
 * @since 0.11.0
 * @param {Number} height Row height.
 * @param {Number} row Row index.
 */
'modifyRowHeight',

/**
 * Fired when a data was retrieved or modified.
 *
 * @event Hooks#modifyData
 * @since 0.28.0
 * @param {Number} row Row height.
 * @param {Number} column Column index.
 * @param {Object} valueHolder Object which contains original value which can be modified by overwriting `.value` property.
 * @param {String} ioMode String which indicates for what operation hook is fired (`get` or `set`).
 */
'modifyData',

/**
 * Fired when a data was retrieved or modified.
 *
 * @event Hooks#modifyRowSourceData
 * @since 0.28.0
 * @param {Number} row Row logical index.
 */
'modifyRowData',

/**
 * Fired after loading data using the Persistent State plugin.
 *
 * @event Hooks#persistentStateLoad
 * @param {String} key Key string.
 * @param {Object} valuePlaceholder Object containing the loaded data.
 */
'persistentStateLoad',

/**
 * Fired after resetting data using the Persistent State plugin.
 *
 * @event Hooks#persistentStateReset
 * @param {String} key Key string.
 */
'persistentStateReset',

/**
 * Fired after resetting data using the Persistent State plugin.
 *
 * @event Hooks#persistentStateSave
 * @param {String} key Key string.
 * @param {Mixed} value Value to save.
 */
'persistentStateSave',

/**
 * Fired before sorting the column. If you return `false` value then sorting will be not applied by
 * Handsontable (useful for server-side sorting).
 *
 * @event Hooks#beforeColumnSort
 * @param {Number} column Sorted column index.
 * @param {Boolean} order Soring order where:
 *  * `true` means ascending order,
 *  * `false` means descending order,
 *  * `undefined` means original order.
 */
'beforeColumnSort',

/**
 * Fired after sorting the column.
 *
 * @event Hooks#afterColumnSort
 * @param {Number} column Sorted column index.
 * @param {Boolean} order Soring order where:
 *  * `true` means ascending order
 *  * `false` means descending order
 *  * `undefined` means original order
 */
'afterColumnSort',

/**
 * @description
 * Fired after setting range of autofill.
 * Both arguments are provided in the following format:
 * ```js
 * [startRow, startColumn, endRow, endColumn]
 * ```
 *
 * @event Hooks#modifyAutofillRange
 * @param {Array} startArea Array of coordinates of the starting point for the drag-down operation.
 * @param {Array} entireArea Array of coordinates of the entire area of the drag-down operation.
 */
'modifyAutofillRange',

/**
 * Fired to allow modifying the copyable range with a callback function.
 *
 * @since 0.19.0
 * @event Hooks#modifyCopyableRange
 * @param {Array} copyableRanges Array of objects defining copyable cells.
 */
'modifyCopyableRange',

/**
 * Called before copying the values into clipboard and before clearing values of the selected cells.
 *
 * @event Hooks#beforeCut
 * @since 0.31.1
 * @param {Array} data An array of arrays which contains data to cut.
 * @param {Array} coords An array of objects with ranges of the visual indexes (`startRow`, `startCol`, `endRow`, `endCol`)
 *                       which will be cut out.
 * @returns {*} If returns `false` then operation of the cutting out is cancelled.
 *
 * @example
 * ```js
 * // To disregard a single row, remove it from array using data.splice(i, 1).
 * ...
 * new Handsontable(document.getElementById('example'), {
 *   beforeCut: function(data, coords) {
 *     // data -> [[1, 2, 3], [4, 5, 6]]
 *     data.splice(0, 1);
 *     // data -> [[4, 5, 6]]
 *     // coords -> [{startRow: 0, startCol: 0, endRow: 1, endCol: 2}]
 *   }
 * });
 * ...
 *
 * // To cancel cutting out, return false from the callback.
 * ...
 * new Handsontable(document.getElementById('example'), {
 *   beforeCut: function(data, coords) {
 *     return false;
 *   }
 * });
 * ...
 * ```
 */
'beforeCut',

/**
 * Fired after data are cutted out from the table.
 *
 * @event Hooks#afterCut
 * @since 0.31.1
 * @param {Array} data An array of arrays which contains the cutted out data.
 * @param {Array} coords An array of objects with ranges of the visual indexes (`startRow`, `startCol`, `endRow`, `endCol`)
 *                       which was cut out.
 */
'afterCut',

/**
 * Fired before values are copied into clipboard.
 *
 * @event Hooks#beforeCopy
 * @since 0.31.1
 * @param {Array} data An array of arrays which contains data to copied.
 * @param {Array} coords An array of objects with ranges of the visual indexes (`startRow`, `startCol`, `endRow`, `endCol`)
 *                       which will copied.
 * @returns {*} If returns `false` then copying is cancelled.
 *
 * @example
 * ```js
 * // To disregard a single row, remove it from array using data.splice(i, 1).
 * ...
 * new Handsontable(document.getElementById('example'), {
 *   beforeCopy: function(data, coords) {
 *     // data -> [[1, 2, 3], [4, 5, 6]]
 *     data.splice(0, 1);
 *     // data -> [[4, 5, 6]]
 *     // coords -> [{startRow: 0, startCol: 0, endRow: 1, endCol: 2}]
 *   }
 * });
 * ...
 *
 * // To cancel copying, return false from the callback.
 * ...
 * new Handsontable(document.getElementById('example'), {
 *   beforeCopy: function(data, coords) {
 *     return false;
 *   }
 * });
 * ...
 * ```
 */
'beforeCopy',

/**
 * Fired after data are pasted into table.
 *
 * @event Hooks#afterCopy
 * @since 0.31.1
 * @param {Array} data An array of arrays which contains the copied data.
 * @param {Array} coords An array of objects with ranges of the visual indexes (`startRow`, `startCol`, `endRow`, `endCol`)
 *                       which was copied.
 */
'afterCopy',

/**
 * Fired before values are pasted into table.
 *
 * @event Hooks#beforePaste
 * @since 0.31.1
 * @param {Array} data An array of arrays which contains data to paste.
 * @param {Array} coords An array of objects with ranges of the visual indexes (`startRow`, `startCol`, `endRow`, `endCol`)
 *                       where changes will be inserted.
 * @returns {*} If returns `false` then pasting is cancelled.
 *
 * @example
 * ```js
 * // To disregard a single row, remove it from array using data.splice(i, 1).
 * ...
 * new Handsontable(document.getElementById('example'), {
 *   beforePaste: function(data, coords) {
 *     // data -> [[1, 2, 3], [4, 5, 6]]
 *     data.splice(0, 1);
 *     // data -> [[4, 5, 6]]
 *     // coords -> [{startRow: 0, startCol: 0, endRow: 1, endCol: 2}]
 *   }
 * });
 * ...
 *
 * // To cancel pasting, return false from the callback.
 * ...
 * new Handsontable(document.getElementById('example'), {
 *   beforePaste: function(data, coords) {
 *     return false;
 *   }
 * });
 * ...
 * ```
 */
'beforePaste',

/**
 * Fired after values are pasted into table.
 *
 * @event Hooks#afterePaste
 * @since 0.31.1
 * @param {Array} data An array of arrays which contains the pasted data.
 * @param {Array} coords An array of objects with ranges of the visual indexes (`startRow`, `startCol`, `endRow`, `endCol`)
 *                       where changes was inserted.
 */
'afterPaste',

/**
 * Fired before change order of the logical indexes.
 *
 * @event Hooks#beforeColumnMove
 * @param {Array} columns Array of visual column indexes to be moved.
 * @param {Number} target Visual column index being a target for moved columns.
 */
'beforeColumnMove',

/**
 * Fired after change order of the logical indexes.
 *
 * @event Hooks#afterColumnMove
 * @param {Array} columns Array of visual column indexes that were moved.
 * @param {Number} target Visual column index being a target for moved columns.
 */
'afterColumnMove',

/**
 * Fired before change order of the logical indexes.
 *
 * @event Hooks#beforeRowMove
 * @param {Array} rows Array of visual row indexes to be moved.
 * @param {Number} target Visual row index being a target for moved rows.
 */
'beforeRowMove',

/**
 * Fired after change order of the logical indexes.
 *
 * @event Hooks#afterRowMove
 * @param {Array} rows Array of visual row indexes that were moved.
 * @param {Number} target Visual row index being a target for moved rows.
 */
'afterRowMove',

/**
 * Fired before rendering the table with modified column sizes.
 *
 * @event Hooks#beforeColumnResize
 * @param {Number} currentColumn Index of the resized column.
 * @param {Number} newSize Calculated new column width.
 * @param {Boolean} isDoubleClick Flag that determines whether there was a double-click.
 * @returns {Number} Returns a new column size or `undefined`, if column size should be calculated automatically.
 */
'beforeColumnResize',

/**
 * Fired after rendering the table with modified column sizes.
 *
 * @event Hooks#afterColumnResize
 * @param {Number} currentColumn Index of the resized column.
 * @param {Number} newSize Calculated new column width.
 * @param {Boolean} isDoubleClick Flag that determines whether there was a double-click.
 */
'afterColumnResize',

/**
 * Fired before rendering the table with modified row sizes.
 *
 * @event Hooks#beforeRowResize
 * @param {Number} currentRow Index of the resized row.
 * @param {Number} newSize Calculated new row height.
 * @param {Boolean} isDoubleClick Flag that determines whether there was a double-click.
 * @returns {Number} Returns the new row size or `undefined` if row size should be calculated automatically.
 */
'beforeRowResize',

/**
 * Fired after rendering the table with modified row sizes.
 *
 * @event Hooks#afterRowResize
 * @param {Number} currentRow Index of the resized row.
 * @param {Number} newSize Calculated new row height.
 * @param {Boolean} isDoubleClick Flag that determines whether there was a double-click.
 */
'afterRowResize',

/**
 * Fired after getting the column header renderers.
 *
 * @event Hooks#afterGetColumnHeaderRenderers
 * @param {Array} array Array of the column header renderers.
 */
'afterGetColumnHeaderRenderers',

/**
 * Fired after getting the row header renderers.
 *
 * @event Hooks#afterGetRowHeaderRenderers
 * @param {Array} array Array of the row header renderers.
 */
'afterGetRowHeaderRenderers',

/**
 * Fired before applying stretched column width to column.
 *
 * @event Hooks#beforeStretchingColumnWidth
 * @param {Number} stretchedWidth Calculated width.
 * @param {Number} column Column index.
 * @returns {Number} Returns new width which will be applied to the column element.
 */
'beforeStretchingColumnWidth',

/**
 * Fired before applying [filtering]{@link http://docs.handsontable.com/pro/demo-filtering.html}.
 *
 * @pro
 * @event Hooks#beforeFilter
 * @param {Array} formulasStack An array of objects with added formulas.
 * @returns {Boolean} If hook returns `false` value then filtering won't be applied on the UI side (server-side filtering).
 */
'beforeFilter',

/**
 * Fired after applying [filtering]{@link http://docs.handsontable.com/pro/demo-filtering.html}.
 *
 * @pro
 * @event Hooks#afterFilter
 * @param {Array} formulasStack An array of objects with added formulas.
 */
'afterFilter',

/**
 * Used to modify the column header height.
 *
 * @event Hooks#modifyColumnHeaderHeight
 * @since 0.25.0
 * @param {Number} col Column index.
 */
'modifyColumnHeaderHeight',

/**
 * Fired before the undo action. Contains information about the action that is being undone.
 *
 * @event Hooks#beforeUndo
 * @since 0.26.2
 * @param {Object} action The action object. Contains information about the action being undone. The `actionType`
 * property of the object specifies the type of the action in a String format. (e.g. `'remove_row'`).
 */
'beforeUndo',

/**
 * Fired after the undo action. Contains information about the action that is being undone.
 *
 * @event Hooks#afterUndo
 * @since 0.26.2
 * @param {Object} action The action object. Contains information about the action being undone. The `actionType`
 * property of the object specifies the type of the action in a String format. (e.g. `'remove_row'`).
 */
'afterUndo',

/**
 * Fired before the redo action. Contains information about the action that is being redone.
 *
 * @event Hooks#beforeRedo
 * @since 0.26.2
 * @param {Object} action The action object. Contains information about the action being redone. The `actionType`
 * property of the object specifies the type of the action in a String format. (e.g. `'remove_row'`).
 */
'beforeRedo',

/**
 * Fired after the redo action. Contains information about the action that is being redone.
 *
 * @event Hooks#afterRedo
 * @since 0.26.2
 * @param {Object} action The action object. Contains information about the action being redone. The `actionType`
 * property of the object specifies the type of the action in a String format. (e.g. `'remove_row'`).
 */
'afterRedo',

/**
 * Used to modify the row header width.
 *
 * @event Hooks#modifyRowHeaderWidth
 * @param {Number} rowHeaderWidth Row header width.
 */
'modifyRowHeaderWidth',

/**
 * Fired from the `populateFromArray` method during the `autofill` process. Fired for each "autofilled" cell individually.
 *
 * @event Hooks#beforeAutofillInsidePopulate
 * @param {Object} index Object containing `row` and `col` properties, defining the number of rows/columns from the initial cell of the autofill.
 * @param {String} direction Declares the direction of the autofill. Possible values: `up`, `down`, `left`, `right`.
 * @param {Array} input Array of arrays. Contains an array of rows with data being used in the autofill.
 * @param {Array} deltas The deltas array passed to the `populateFromArray` method.
 */
'beforeAutofillInsidePopulate',

/**
 * Fired when the start of the selection is being modified. (e.g. moving the selection with the arrow keys).
 *
 * @event Hooks#modifyTransformStart
 * @param {CellCoords} delta Cell coords object declaring the delta of the new selection relative to the previous one.
 */
'modifyTransformStart',

/**
 * Fired when the end of the selection is being modified. (e.g. moving the selection with the arrow keys).
 *
 * @event Hooks#modifyTransformEnd
 * @param {CellCoords} delta Cell coords object declaring the delta of the new selection relative to the previous one.
 */
'modifyTransformEnd',

/**
 * Fired after the start of the selection is being modified. (e.g. moving the selection with the arrow keys).
 *
 * @event Hooks#afterModifyTransformStart
 * @param {CellCoords} coords Coords of the freshly selected cell.
 * @param {Number} rowTransformDir `-1` if trying to select a cell with a negative row index. `0` otherwise.
 * @param {Number} colTransformDir `-1` if trying to select a cell with a negative column index. `0` otherwise.
 */
'afterModifyTransformStart',

/**
 * Fired after the end of the selection is being modified. (e.g. moving the selection with the arrow keys).
 *
 * @event Hooks#afterModifyTransformEnd
 * @param {CellCoords} coords Coords of the freshly selected cell.
 * @param {Number} rowTransformDir `-1` if trying to select a cell with a negative row index. `0` otherwise.
 * @param {Number} colTransformDir `-1` if trying to select a cell with a negative column index. `0` otherwise.
 */
'afterModifyTransformEnd',

/**
 * Fired before rendering a cell value.
 *
 * @event Hooks#beforeValueRender
 * @param {Mixed} value The rendered value.
 */
'beforeValueRender',

/**
 * Fired inside the `viewportRowCalculatorOverride` method. Allows modifying the row calculator parameters.
 *
 * @event Hooks#afterViewportRowCalculatorOverride
 * @param {Object} calc The row calculator.
 */
'afterViewportRowCalculatorOverride',

/**
 * Fired inside the `viewportColumnCalculatorOverride` method. Allows modifying the row calculator parameters.
 *
 * @event Hooks#afterViewportColumnCalculatorOverride
 * @param {Object} calc The row calculator.
 */
'afterViewportColumnCalculatorOverride',

/**
 * Fired after initializing all the plugins.
 *
 * @event Hooks#afterPluginsInitialized
 */
'afterPluginsInitialized',

/**
 * Used when saving/loading the manual row heights state.
 *
 * @event Hooks#manualRowHeights
 * @param {Array} state The current manual row heights state.
 */
'manualRowHeights',

/**
 * Used to skip the length cache calculation for a defined period of time.
 *
 * @event Hooks#skipLengthCache
 * @param {Number} delay The delay in milliseconds.
 */
'skipLengthCache',

/**
 * Fired after trimming rows in the TrimRows plugin.
 *
 * @pro
 * @event Hooks#afterTrimRow
 * @param {Array} rows Indexes of trimmed rows.
 */
'afterTrimRow',

/**
 * Fired after untrimming rows in the TrimRows plugin.
 *
 * @pro
 * @event Hooks#afterUntrimRow
 * @param {Array} rows Indexes of untrimmed rows.
 */
'afterUntrimRow',

/**
 * Fired after opening the dropdown menu.
 *
 * @pro
 * @event Hooks#afterDropdownMenuShow
 * @param {DropdownMenu} instance The DropdownMenu instance.
 */
'afterDropdownMenuShow',

/**
 * Fired after hiding the dropdown menu.
 *
 * @pro
 * @event Hooks#afterDropdownMenuHide
 * @param {DropdownMenu} instance The DropdownMenu instance.
 */
'afterDropdownMenuHide',

/**
 * Used to check whether the provided row index is hidden.
 *
 * @pro
 * @event Hooks#hiddenRow
 * @param {Number} row The row index in question.
 */
'hiddenRow',

/**
 * Used to check whether the provided column index is hidden.
 *
 * @pro
 * @event Hooks#hiddenColumn
 * @param {Number} column The column index in question.
 */
'hiddenColumn',

/**
 * Fired before adding a children to the NestedRows structure.
 *
 * @pro
 * @event Hooks#beforeAddChild
 * @param {Object} parent The parent object.
 * @param {Object|undefined} element The element added as a child. If `undefined`, a blank child was added.
 * @param {Number|undefined} index The index within the parent where the new child was added. If `undefined`, the element was added as the last child.
 */
'beforeAddChild',

/**
 * Fired after adding a children to the NestedRows structure.
 *
 * @pro
 * @event Hooks#afterAddChild
 * @param {Object} parent The parent object.
 * @param {Object|undefined} element The element added as a child. If `undefined`, a blank child was added.
 * @param {Number|undefined} index The index within the parent where the new child was added. If `undefined`, the element was added as the last child.
 */
'afterAddChild',

/**
 * Fired before detaching a child from its parent in the NestedRows plugin.
 *
 * @pro
 * @event Hooks#beforeDetachChild
 * @param {Object} parent An object representing the parent from which the element is to be detached.
 * @param {Object} element The detached element.
 */
'beforeDetachChild',

/**
 * Fired after detaching a child from its parent in the NestedRows plugin.
 *
 * @pro
 * @event Hooks#afterDetachChild
 * @param {Object} parent An object representing the parent from which the element was detached.
 * @param {Object} element The detached element.
 */
'afterDetachChild',

/**
 * Fired after the editor is opened and rendered.
 *
 * @event Hooks#afterBeginEditing
 * @param {Number} row Row index of the edited cell.
 * @param {Number} column Column index of the edited cell.
 */
'afterBeginEditing'];

var Hooks = function () {
  _createClass(Hooks, null, [{
    key: 'getSingleton',
    value: function getSingleton() {
      return globalSingleton;
    }

    /**
     *
     */

  }]);

  function Hooks() {
    _classCallCheck(this, Hooks);

    this.globalBucket = this.createEmptyBucket();
  }

  /**
   * Returns a new object with empty handlers related to every registered hook name.
   *
   * @returns {Object} The empty bucket object.
   *
   * @example
   * ```js
   * Handsontable.hooks.createEmptyBucket();
   * // Results:
   * {
   * ...
   * afterCreateCol: [],
   * afterCreateRow: [],
   * beforeInit: [],
   * ...
   * }
   * ```
   */


  _createClass(Hooks, [{
    key: 'createEmptyBucket',
    value: function createEmptyBucket() {
      var bucket = Object.create(null);

      arrayEach(REGISTERED_HOOKS, function (hook) {
        return bucket[hook] = [];
      });

      return bucket;
    }

    /**
     * Get hook bucket based on the context of the object or if argument is `undefined`, get the global hook bucket.
     *
     * @param {Object} [context=null] A Handsontable instance.
     * @returns {Object} Returns a global or Handsontable instance bucket.
     */

  }, {
    key: 'getBucket',
    value: function getBucket() {
      var context = arguments.length > 0 && arguments[0] !== undefined ? arguments[0] : null;

      if (context) {
        if (!context.pluginHookBucket) {
          context.pluginHookBucket = this.createEmptyBucket();
        }

        return context.pluginHookBucket;
      }

      return this.globalBucket;
    }

    /**
     * Adds a listener (globally or locally) to a specified hook name.
     * If the `context` parameter is provided, the hook will be added only to the instance it references.
     * Otherwise, the callback will be used everytime the hook fires on any Handsontable instance.
     * You can provide an array of callback functions as the `callback` argument, this way they will all be fired
     * once the hook is triggered.
     *
     * @see Core#addHook
     * @param {String} key Hook name.
     * @param {Function|Array} callback Callback function or an array of functions.
     * @param {Object} [context=null] The context for the hook callback to be added - a Handsontable instance or leave empty.
     * @returns {Hooks} Instance of Hooks.
     *
     * @example
     * ```js
     * // single callback, added locally
     * Handsontable.hooks.add('beforeInit', myCallback, hotInstance);
     *
     * // single callback, added globally
     * Handsontable.hooks.add('beforeInit', myCallback);
     *
     * // multiple callbacks, added locally
     * Handsontable.hooks.add('beforeInit', [myCallback, anotherCallback], hotInstance);
     *
     * // multiple callbacks, added globally
     * Handsontable.hooks.add('beforeInit', [myCallback, anotherCallback]);
     * ```
     */

  }, {
    key: 'add',
    value: function add(key, callback) {
      var _this = this;

      var context = arguments.length > 2 && arguments[2] !== undefined ? arguments[2] : null;

      if (Array.isArray(callback)) {
        arrayEach(callback, function (c) {
          return _this.add(key, c, context);
        });
      } else {
        var bucket = this.getBucket(context);

        if (typeof bucket[key] === 'undefined') {
          this.register(key);
          bucket[key] = [];
        }
        callback.skip = false;

        if (bucket[key].indexOf(callback) === -1) {
          // only add a hook if it has not already been added (adding the same hook twice is now silently ignored)
          var foundInitialHook = false;

          if (callback.initialHook) {
            arrayEach(bucket[key], function (cb, i) {
              if (cb.initialHook) {
                bucket[key][i] = callback;
                foundInitialHook = true;

                return false;
              }
            });
          }

          if (!foundInitialHook) {
            bucket[key].push(callback);
          }
        }
      }

      return this;
    }

    /**
     * Adds a listener to a specified hook. After the hook runs this listener will be automatically removed from the bucket.
     *
     * @see Core#addHookOnce
     * @param {String} key Hook/Event name.
     * @param {Function|Array} callback Callback function.
     * @param {Object} [context=null] A Handsontable instance.
     *
     * @example
     * ```js
     * Handsontable.hooks.once('beforeInit', myCallback, hotInstance);
     * ```
     */

  }, {
    key: 'once',
    value: function once(key, callback) {
      var _this2 = this;

      var context = arguments.length > 2 && arguments[2] !== undefined ? arguments[2] : null;

      if (Array.isArray(callback)) {
        arrayEach(callback, function (c) {
          return _this2.once(key, c, context);
        });
      } else {
        callback.runOnce = true;
        this.add(key, callback, context);
      }
    }

    /**
     * Removes a listener from a hook with a given name. If the `context` argument is provided, it removes a listener from a local hook assigned to the given Handsontable instance.
     *
     * @see Core#removeHook
     * @param {String} key Hook/Event name.
     * @param {Function} callback Callback function (needs the be the function that was previously added to the hook).
     * @param {Object} [context=null] Handsontable instance.
     * @return {Boolean} Returns `true` if hook was removed, `false` otherwise.
     *
     * @example
     * ```js
     * Handsontable.hooks.remove('beforeInit', myCallback);
     * ```
     */

  }, {
    key: 'remove',
    value: function remove(key, callback) {
      var context = arguments.length > 2 && arguments[2] !== undefined ? arguments[2] : null;

      var bucket = this.getBucket(context);

      if (typeof bucket[key] !== 'undefined') {
        if (bucket[key].indexOf(callback) >= 0) {
          callback.skip = true;

          return true;
        }
      }

      return false;
    }

    /**
     * Checks whether there are any registered listeners for the provided hook name.
     * If the `context` parameter is provided, it only checks for listeners assigned to the given Handsontable instance.
     *
     * @param {String} key Hook name.
     * @param {Object} [context=null] A Handsontable instance.
     * @returns {Boolean} `true` for success, `false` otherwise.
     */

  }, {
    key: 'has',
    value: function has(key) {
      var context = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : null;

      var bucket = this.getBucket(context);

      return !!(bucket[key] !== void 0 && bucket[key].length);
    }

    /**
     * Runs all local and global callbacks assigned to the hook identified by the `key` parameter.
     * It returns either a return value from the last called callback or the first parameter (`p1`) passed to the `run` function.
     *
     * @see Core#runHooks
     * @param {Object} context Handsontable instance.
     * @param {String} key Hook/Event name.
     * @param {*} [p1] Parameter to be passed as an argument to the callback function.
     * @param {*} [p2] Parameter to be passed as an argument to the callback function.
     * @param {*} [p3] Parameter to be passed as an argument to the callback function.
     * @param {*} [p4] Parameter to be passed as an argument to the callback function.
     * @param {*} [p5] Parameter to be passed as an argument to the callback function.
     * @param {*} [p6] Parameter to be passed as an argument to the callback function.
     * @returns {*} Either a return value from the last called callback or `p1`.
     *
     * @example
     * ```js
     * Handsontable.hooks.run(hot, 'beforeInit');
     * ```
     */

  }, {
    key: 'run',
    value: function run(context, key, p1, p2, p3, p4, p5, p6) {
      {
        var globalHandlers = this.globalBucket[key];
        var index = -1;
        var length = globalHandlers ? globalHandlers.length : 0;

        if (length) {
          // Do not optimise this loop with arrayEach or arrow function! If you do You'll decrease perf because of GC.
          while (++index < length) {
            if (!globalHandlers[index] || globalHandlers[index].skip) {
              /* eslint-disable no-continue */
              continue;
            }
            // performance considerations - http://jsperf.com/call-vs-apply-for-a-plugin-architecture
            var res = globalHandlers[index].call(context, p1, p2, p3, p4, p5, p6);

            if (res !== void 0) {
              p1 = res;
            }
            if (globalHandlers[index] && globalHandlers[index].runOnce) {
              this.remove(key, globalHandlers[index]);
            }
          }
        }
      }
      {
        var localHandlers = this.getBucket(context)[key];
        var _index = -1;
        var _length = localHandlers ? localHandlers.length : 0;

        if (_length) {
          // Do not optimise this loop with arrayEach or arrow function! If you do You'll decrease perf because of GC.
          while (++_index < _length) {
            if (!localHandlers[_index] || localHandlers[_index].skip) {
              /* eslint-disable no-continue */
              continue;
            }
            // performance considerations - http://jsperf.com/call-vs-apply-for-a-plugin-architecture
            var _res = localHandlers[_index].call(context, p1, p2, p3, p4, p5, p6);

            if (_res !== void 0) {
              p1 = _res;
            }
            if (localHandlers[_index] && localHandlers[_index].runOnce) {
              this.remove(key, localHandlers[_index], context);
            }
          }
        }
      }

      return p1;
    }

    /**
     * Destroy all listeners connected to the context. If no context is provided, the global listeners will be destroyed.
     *
     * @param {Object} [context=null] A Handsontable instance.
     * @example
     * ```js
     * // destroy the global listeners
     * Handsontable.hooks.destroy();
     *
     * // destroy the local listeners
     * Handsontable.hooks.destroy(hotInstance);
     * ```
     */

  }, {
    key: 'destroy',
    value: function destroy() {
      var context = arguments.length > 0 && arguments[0] !== undefined ? arguments[0] : null;

      objectEach(this.getBucket(context), function (value, key, bucket) {
        return bucket[key].length = 0;
      });
    }

    /**
     * Registers a hook name (adds it to the list of the known hook names). Used by plugins.
     * It is not necessary to call register, but if you use it, your plugin hook will be used returned by
     * the `getRegistered` method. (which itself is used in the demo http://docs.handsontable.com/tutorial-callbacks.html).
     *
     * @param key {String} The hook name.
     *
     * @example
     * ```js
     * Handsontable.hooks.register('myHook');
     * ```
     */

  }, {
    key: 'register',
    value: function register(key) {
      if (!this.isRegistered(key)) {
        REGISTERED_HOOKS.push(key);
      }
    }

    /**
     * Deregisters a hook name (removes it from the list of known hook names).
     *
     * @param key {String} Hook name.
     *
     * @example
     * ```js
     * Handsontable.hooks.deregister('myHook');
     * ```
     */

  }, {
    key: 'deregister',
    value: function deregister(key) {
      if (this.isRegistered(key)) {
        REGISTERED_HOOKS.splice(REGISTERED_HOOKS.indexOf(key), 1);
      }
    }

    /**
     * Returns a boolean depending on if a hook by such name has been registered.
     *
     * @param key {String} Hook name.
     * @returns {Boolean} `true` for success, `false` otherwise.
     *
     * @example
     * ```js
     * Handsontable.hooks.isRegistered('beforeInit');
     *
     * // Results:
     * true
     * ```
     */

  }, {
    key: 'isRegistered',
    value: function isRegistered(key) {
      return REGISTERED_HOOKS.indexOf(key) >= 0;
    }

    /**
     * Returns an array of registered hooks.
     *
     * @returns {Array} An array of registered hooks.
     *
     * @example
     * ```js
     * Handsontable.hooks.getRegistered();
     *
     * // Results:
     * [
     * ...
     *   'beforeInit',
     *   'beforeRender',
     *   'beforeSetRangeEnd',
     *   'beforeDrawBorders',
     *   'beforeChange',
     * ...
     * ]
     * ```
     */

  }, {
    key: 'getRegistered',
    value: function getRegistered() {
      return REGISTERED_HOOKS;
    }
  }]);

  return Hooks;
}();

var globalSingleton = new Hooks();

export default Hooks;