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- /**
- * @license Copyright (c) 2003-2015, CKSource - Frederico Knabben. All rights reserved.
- * For licensing, see LICENSE.md.
- */
- 'use strict';
- CKEDITOR.define( [
- 'document/character',
- 'document/element',
- 'document/position'
- ], function( Character, Element, Position ) {
- var OPENING_TAG = 0;
- var CLOSING_TAG = 1;
- var CHARACTER = 2;
- /**
- * Position iterator class. It allows to iterate forward and backward over the tree document.
- *
- * @class document.PositionIterator
- */
- class PositionIterator {
- /**
- * Create a range iterator.
- *
- * @param {document.range} boundaries Range to define boundaries of the iterator.
- */
- constructor( boundaries, iteratorPosition ) {
- if ( boundaries instanceof Position ) {
- this.position = boundaries;
- } else {
- this.boundaries = boundaries;
- this.position = iteratorPosition || boundaries.start;
- }
- /**
- * Iterator position.
- *
- * @property {document.Position} position
- */
- /**
- * Iterator boundaries. When {@link #next} is called on end boundary or {@link #previous} on the
- * first then `{ done: true }` is returned.
- *
- * If boundaries are not defined they are set before first and after last child of the root node.
- *
- * @property {document.Range} boundaries
- */
- }
- /**
- * Move {@link #position} to the next position and returned skipped value.
- *
- * @returns {Object} Value between last and new {@link #position}.
- * @returns {Boolean} return.done True if iterator is done.
- * @returns {Object} return.value
- * @returns {Number} return.value.type Skipped value type, possible options: {@link PositionIterator#OPENING_TAG},
- * {@link PositionIterator#CLOSING_TAG} or {@link PositionIterator#CHARACTER}.
- * @returns {Node} return.value.node Skipped node.
- */
- next() {
- var position = this.position;
- var parent = position.parent;
- // We are at the end of the root.
- if ( parent.parent === null && position.offset === parent.children.length ) {
- return { done: true };
- }
- if ( this.boundaries && position.isEqual( this.boundaries.end ) ) {
- return { done: true };
- }
- var nodeAfter = position.nodeAfter;
- if ( nodeAfter instanceof Element ) {
- this.position = Position.makePositionFromParentAndOffset( nodeAfter, 0, position.root );
- return formatReturnValue( OPENING_TAG, nodeAfter );
- } else if ( nodeAfter instanceof Character ) {
- this.position = Position.makePositionFromParentAndOffset( parent, position.offset + 1, position.root );
- return formatReturnValue( CHARACTER, nodeAfter );
- } else {
- this.position = Position.makePositionFromParentAndOffset( parent.parent, parent.positionInParent + 1, position.root );
- return formatReturnValue( CLOSING_TAG, this.position.nodeBefore );
- }
- }
- /**
- * Move {@link #position} to the previous position and returned skipped value.
- *
- * @returns {Object} Value between last and new {@link #position}.
- * @returns {Boolean} return.done True if iterator is done.
- * @returns {Object} return.value
- * @returns {Number} return.value.type Skipped value type, possible options: {@link PositionIterator#OPENING_TAG},
- * {@link PositionIterator#CLOSING_TAG} or {@link PositionIterator#CHARACTER}.
- * @returns {Node} return.value.node Skipped node.
- */
- previous() {
- var position = this.position;
- var parent = position.parent;
- // We are at the begging of the root.
- if ( parent.parent === null && position.offset === 0 ) {
- return { done: true };
- }
- if ( this.boundaries && position.isEqual( this.boundaries.start ) ) {
- return { done: true };
- }
- var nodeBefore = position.nodeBefore;
- if ( nodeBefore instanceof Element ) {
- this.position = Position.makePositionFromParentAndOffset( nodeBefore, nodeBefore.children.length, position.root );
- return formatReturnValue( CLOSING_TAG, nodeBefore );
- } else if ( nodeBefore instanceof Character ) {
- this.position = Position.makePositionFromParentAndOffset( parent, position.offset - 1, position.root );
- return formatReturnValue( CHARACTER, nodeBefore );
- } else {
- this.position = Position.makePositionFromParentAndOffset( parent.parent, parent.positionInParent, position.root );
- return formatReturnValue( OPENING_TAG, this.position.nodeAfter );
- }
- }
- }
- function formatReturnValue( type, node ) {
- return {
- done: false,
- value: {
- type: type,
- node: node
- }
- };
- }
- /**
- * Flag for opening tag.
- *
- * @readonly
- */
- PositionIterator.OPENING_TAG = OPENING_TAG;
- /**
- * Flag for closing tag.
- *
- * @readonly
- */
- PositionIterator.CLOSING_TAG = CLOSING_TAG;
- /**
- * Flag for character.
- *
- * @readonly
- */
- PositionIterator.CHARACTER = CHARACTER;
- return PositionIterator;
- } );
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