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- /**
- * @license Copyright (c) 2003-2018, CKSource - Frederico Knabben. All rights reserved.
- * For licensing, see LICENSE.md.
- */
- /**
- * @module typing/input
- */
- import Plugin from '@ckeditor/ckeditor5-core/src/plugin';
- import ModelRange from '@ckeditor/ckeditor5-engine/src/model/range';
- import ViewPosition from '@ckeditor/ckeditor5-engine/src/view/position';
- import ViewText from '@ckeditor/ckeditor5-engine/src/view/text';
- import diff from '@ckeditor/ckeditor5-utils/src/diff';
- import diffToChanges from '@ckeditor/ckeditor5-utils/src/difftochanges';
- import { getCode } from '@ckeditor/ckeditor5-utils/src/keyboard';
- import DomConverter from '@ckeditor/ckeditor5-engine/src/view/domconverter';
- import InputCommand from './inputcommand';
- /**
- * Handles text input coming from the keyboard or other input methods.
- *
- * @extends module:core/plugin~Plugin
- */
- export default class Input extends Plugin {
- /**
- * @inheritDoc
- */
- static get pluginName() {
- return 'Input';
- }
- /**
- * @inheritDoc
- */
- init() {
- const editor = this.editor;
- const editingView = editor.editing.view;
- const inputCommand = new InputCommand( editor, editor.config.get( 'typing.undoStep' ) || 20 );
- // TODO The above default configuration value should be defined using editor.config.define() once it's fixed.
- editor.commands.add( 'input', inputCommand );
- this.listenTo( editingView.document, 'keydown', ( evt, data ) => {
- this._handleKeydown( data, inputCommand );
- }, { priority: 'lowest' } );
- this.listenTo( editingView.document, 'mutations', ( evt, mutations, viewSelection ) => {
- this._handleMutations( mutations, viewSelection );
- } );
- }
- /**
- * Handles the keydown event. We need to guess whether such keystroke is going to result
- * in typing. If so, then before character insertion happens, any selected content needs
- * to be deleted. Otherwise the default browser deletion mechanism would be
- * triggered, resulting in:
- *
- * * Hundreds of mutations which could not be handled.
- * * But most importantly, loss of control over how the content is being deleted.
- *
- * The method is used in a low-priority listener, hence allowing other listeners (e.g. delete or enter features)
- * to handle the event.
- *
- * @private
- * @param {module:engine/view/observer/keyobserver~KeyEventData} evtData
- * @param {module:typing/inputcommand~InputCommand} inputCommand
- */
- _handleKeydown( evtData, inputCommand ) {
- const model = this.editor.model;
- const doc = model.document;
- const buffer = inputCommand.buffer;
- // By relying on the state of the input command we allow disabling the entire input easily
- // by just disabling the input command. We could’ve used here the delete command but that
- // would mean requiring the delete feature which would block loading one without the other.
- // We could also check the editor.isReadOnly property, but that wouldn't allow to block
- // the input without blocking other features.
- if ( !inputCommand.isEnabled ) {
- return;
- }
- if ( isSafeKeystroke( evtData ) || doc.selection.isCollapsed ) {
- return;
- }
- buffer.lock();
- model.enqueueChange( buffer.batch, () => {
- this.editor.model.deleteContent( doc.selection );
- } );
- buffer.unlock();
- }
- /**
- * Handles DOM mutations.
- *
- * @private
- * @param {Array.<module:engine/view/observer/mutationobserver~MutatedText|
- * module:engine/view/observer/mutationobserver~MutatedChildren>} mutations
- * @param {module:engine/view/selection~Selection|null} viewSelection
- */
- _handleMutations( mutations, viewSelection ) {
- new MutationHandler( this.editor ).handle( mutations, viewSelection );
- }
- }
- /**
- * Helper class for translating DOM mutations into model changes.
- *
- * @private
- */
- class MutationHandler {
- /**
- * Creates an instance of the mutation handler.
- *
- * @param {module:core/editor/editor~Editor} editor
- */
- constructor( editor ) {
- /**
- * Editor instance for which mutations are handled.
- *
- * @readonly
- * @member {module:core/editor/editor~Editor} #editor
- */
- this.editor = editor;
- /**
- * The editing controller.
- *
- * @readonly
- * @member {module:engine/controller/editingcontroller~EditingController} #editing
- */
- this.editing = this.editor.editing;
- }
- /**
- * Handles given mutations.
- *
- * @param {Array.<module:engine/view/observer/mutationobserver~MutatedText|
- * module:engine/view/observer/mutationobserver~MutatedChildren>} mutations
- * @param {module:engine/view/selection~Selection|null} viewSelection
- */
- handle( mutations, viewSelection ) {
- if ( containerChildrenMutated( mutations ) ) {
- this._handleContainerChildrenMutations( mutations, viewSelection );
- } else {
- for ( const mutation of mutations ) {
- // Fortunately it will never be both.
- this._handleTextMutation( mutation, viewSelection );
- this._handleTextNodeInsertion( mutation );
- }
- }
- }
- /**
- * Handles situations when container's children mutated during input. This can happen when
- * the browser is trying to "fix" DOM in certain situations. For example, when the user starts to type
- * in `<p><a href=""><i>Link{}</i></a></p>`, the browser might change the order of elements
- * to `<p><i><a href="">Link</a>x{}</i></p>`. A similar situation happens when the spell checker
- * replaces a word wrapped with `<strong>` with a word wrapped with a `<b>` element.
- *
- * To handle such situations, the common DOM ancestor of all mutations is converted to the model representation
- * and then compared with the current model to calculate the proper text change.
- *
- * Note: Single text node insertion is handled in {@link #_handleTextNodeInsertion} and text node mutation is handled
- * in {@link #_handleTextMutation}).
- *
- * @private
- * @param {Array.<module:engine/view/observer/mutationobserver~MutatedText|
- * module:engine/view/observer/mutationobserver~MutatedChildren>} mutations
- * @param {module:engine/view/selection~Selection|null} viewSelection
- */
- _handleContainerChildrenMutations( mutations, viewSelection ) {
- // Get common ancestor of all mutations.
- const mutationsCommonAncestor = getMutationsContainer( mutations );
- // Quit if there is no common ancestor.
- if ( !mutationsCommonAncestor ) {
- return;
- }
- const domConverter = this.editor.editing.view.domConverter;
- // Get common ancestor in DOM.
- const domMutationCommonAncestor = domConverter.mapViewToDom( mutationsCommonAncestor );
- // Create fresh DomConverter so it will not use existing mapping and convert current DOM to model.
- // This wouldn't be needed if DomConverter would allow to create fresh view without checking any mappings.
- const freshDomConverter = new DomConverter();
- const modelFromCurrentDom = this.editor.data.toModel(
- freshDomConverter.domToView( domMutationCommonAncestor )
- ).getChild( 0 );
- // Current model.
- const currentModel = this.editor.editing.mapper.toModelElement( mutationsCommonAncestor );
- // If common ancestor is not mapped, do not do anything. It probably is a parent of another view element.
- // That means that we would need to diff model elements (see `if` below). Better return early instead of
- // trying to get a reasonable model ancestor. It will fell into the `if` below anyway.
- // This situation happens for example for lists. If `<ul>` is a common ancestor, `currentModel` is `undefined`
- // because `<ul>` is not mapped (`<li>`s are).
- // See https://github.com/ckeditor/ckeditor5/issues/718.
- if ( !currentModel ) {
- return;
- }
- // Get children from both ancestors.
- const modelFromDomChildren = Array.from( modelFromCurrentDom.getChildren() );
- const currentModelChildren = Array.from( currentModel.getChildren() );
- // Skip situations when common ancestor has any elements (cause they are too hard).
- if ( !hasOnlyTextNodes( modelFromDomChildren ) || !hasOnlyTextNodes( currentModelChildren ) ) {
- return;
- }
- // Replace inserted by the browser with normal space.
- // See comment in `_handleTextMutation`.
- const newText = modelFromDomChildren.map( item => item.data ).join( '' ).replace( /\u00A0/g, ' ' );
- const oldText = currentModelChildren.map( item => item.data ).join( '' );
- // Do nothing if mutations created same text.
- if ( oldText === newText ) {
- return;
- }
- const diffResult = diff( oldText, newText );
- const { firstChangeAt, insertions, deletions } = calculateChanges( diffResult );
- // Try setting new model selection according to passed view selection.
- let modelSelectionRange = null;
- if ( viewSelection ) {
- modelSelectionRange = this.editing.mapper.toModelRange( viewSelection.getFirstRange() );
- }
- const insertText = newText.substr( firstChangeAt, insertions );
- const removeRange = ModelRange.createFromParentsAndOffsets(
- currentModel,
- firstChangeAt,
- currentModel,
- firstChangeAt + deletions
- );
- this.editor.execute( 'input', {
- text: insertText,
- range: removeRange,
- resultRange: modelSelectionRange
- } );
- }
- _handleTextMutation( mutation, viewSelection ) {
- if ( mutation.type != 'text' ) {
- return;
- }
- // Replace inserted by the browser with normal space.
- // We want only normal spaces in the model and in the view. Renderer and DOM Converter will be then responsible
- // for rendering consecutive spaces using , but the model and the view has to be clear.
- // Other feature may introduce inserting non-breakable space on specific key stroke (for example shift + space).
- // However then it will be handled outside of mutations, like enter key is.
- // The replacing is here because it has to be done before `diff` and `diffToChanges` functions, as they
- // take `newText` and compare it to (cleaned up) view.
- // It could also be done in mutation observer too, however if any outside plugin would like to
- // introduce additional events for mutations, they would get already cleaned up version (this may be good or not).
- const newText = mutation.newText.replace( /\u00A0/g, ' ' );
- // To have correct `diffResult`, we also compare view node text data with replaced by space.
- const oldText = mutation.oldText.replace( /\u00A0/g, ' ' );
- const diffResult = diff( oldText, newText );
- const { firstChangeAt, insertions, deletions } = calculateChanges( diffResult );
- // Try setting new model selection according to passed view selection.
- let modelSelectionRange = null;
- if ( viewSelection ) {
- modelSelectionRange = this.editing.mapper.toModelRange( viewSelection.getFirstRange() );
- }
- // Get the position in view and model where the changes will happen.
- const viewPos = new ViewPosition( mutation.node, firstChangeAt );
- const modelPos = this.editing.mapper.toModelPosition( viewPos );
- const removeRange = ModelRange.createFromPositionAndShift( modelPos, deletions );
- const insertText = newText.substr( firstChangeAt, insertions );
- this.editor.execute( 'input', {
- text: insertText,
- range: removeRange,
- resultRange: modelSelectionRange
- } );
- }
- _handleTextNodeInsertion( mutation ) {
- if ( mutation.type != 'children' ) {
- return;
- }
- const change = getSingleTextNodeChange( mutation );
- const viewPos = new ViewPosition( mutation.node, change.index );
- const modelPos = this.editing.mapper.toModelPosition( viewPos );
- const insertedText = change.values[ 0 ].data;
- this.editor.execute( 'input', {
- // Replace inserted by the browser with normal space.
- // See comment in `_handleTextMutation`.
- // In this case we don't need to do this before `diff` because we diff whole nodes.
- // Just change in case there are some.
- text: insertedText.replace( /\u00A0/g, ' ' ),
- range: new ModelRange( modelPos )
- } );
- }
- }
- const safeKeycodes = [
- getCode( 'arrowUp' ),
- getCode( 'arrowRight' ),
- getCode( 'arrowDown' ),
- getCode( 'arrowLeft' ),
- 9, // Tab
- 16, // Shift
- 17, // Ctrl
- 18, // Alt
- 20, // CapsLock
- 27, // Escape
- 33, // PageUp
- 34, // PageDown
- 35, // Home
- 36, // End
- 229 // Composition start key
- ];
- // Function keys.
- for ( let code = 112; code <= 135; code++ ) {
- safeKeycodes.push( code );
- }
- // Returns `true` if a keystroke should not cause any content change caused by "typing".
- //
- // Note: This implementation is very simple and will need to be refined with time.
- //
- // @private
- // @param {engine.view.observer.keyObserver.KeyEventData} keyData
- // @returns {Boolean}
- function isSafeKeystroke( keyData ) {
- // Keystrokes which contain Ctrl don't represent typing.
- if ( keyData.ctrlKey ) {
- return true;
- }
- return safeKeycodes.includes( keyData.keyCode );
- }
- // Helper function that compares whether two given view nodes are same. It is used in `diff` when it's passed an array
- // with child nodes.
- function compareChildNodes( oldChild, newChild ) {
- if ( oldChild instanceof ViewText && newChild instanceof ViewText ) {
- return oldChild.data === newChild.data;
- } else {
- return oldChild === newChild;
- }
- }
- // Returns change made to a single text node. Returns `undefined` if more than a single text node was changed.
- //
- // @private
- // @param mutation
- function getSingleTextNodeChange( mutation ) {
- // One new node.
- if ( mutation.newChildren.length - mutation.oldChildren.length != 1 ) {
- return;
- }
- // Which is text.
- const diffResult = diff( mutation.oldChildren, mutation.newChildren, compareChildNodes );
- const changes = diffToChanges( diffResult, mutation.newChildren );
- // In case of [ delete, insert, insert ] the previous check will not exit.
- if ( changes.length > 1 ) {
- return;
- }
- const change = changes[ 0 ];
- // Which is text.
- if ( !( change.values[ 0 ] instanceof ViewText ) ) {
- return;
- }
- return change;
- }
- // Returns first common ancestor of all mutations that is either {@link module:engine/view/containerelement~ContainerElement}
- // or {@link module:engine/view/rootelement~RootElement}.
- //
- // @private
- // @param {Array.<module:engine/view/observer/mutationobserver~MutatedText|
- // module:engine/view/observer/mutationobserver~MutatedChildren>} mutations
- // @returns {module:engine/view/containerelement~ContainerElement|engine/view/rootelement~RootElement|undefined}
- function getMutationsContainer( mutations ) {
- const lca = mutations
- .map( mutation => mutation.node )
- .reduce( ( commonAncestor, node ) => {
- return commonAncestor.getCommonAncestor( node, { includeSelf: true } );
- } );
- if ( !lca ) {
- return;
- }
- // We need to look for container and root elements only, so check all LCA's
- // ancestors (starting from itself).
- return lca.getAncestors( { includeSelf: true, parentFirst: true } )
- .find( element => element.is( 'containerElement' ) || element.is( 'rootElement' ) );
- }
- // Returns true if container children have mutated or more than a single text node was changed.
- //
- // Single text node child insertion is handled in {@link module:typing/input~MutationHandler#_handleTextNodeInsertion}
- // while text mutation is handled in {@link module:typing/input~MutationHandler#_handleTextMutation}.
- //
- // @private
- // @param {Array.<module:engine/view/observer/mutationobserver~MutatedText|
- // module:engine/view/observer/mutationobserver~MutatedChildren>} mutations
- // @returns {Boolean}
- function containerChildrenMutated( mutations ) {
- if ( mutations.length == 0 ) {
- return false;
- }
- // Check if there is any mutation of `children` type or any mutation that changes more than one text node.
- for ( const mutation of mutations ) {
- if ( mutation.type === 'children' && !getSingleTextNodeChange( mutation ) ) {
- return true;
- }
- }
- return false;
- }
- // Returns true if provided array contains only {@link module:engine/model/text~Text model text nodes}.
- //
- // @param {Array.<module:engine/model/node~Node>} children
- // @returns {Boolean}
- function hasOnlyTextNodes( children ) {
- return children.every( child => child.is( 'text' ) );
- }
- // Calculates first change index and number of characters that should be inserted and deleted starting from that index.
- //
- // @private
- // @param diffResult
- // @return {{insertions: number, deletions: number, firstChangeAt: *}}
- function calculateChanges( diffResult ) {
- // Index where the first change happens. Used to set the position from which nodes will be removed and where will be inserted.
- let firstChangeAt = null;
- // Index where the last change happens. Used to properly count how many characters have to be removed and inserted.
- let lastChangeAt = null;
- // Get `firstChangeAt` and `lastChangeAt`.
- for ( let i = 0; i < diffResult.length; i++ ) {
- const change = diffResult[ i ];
- if ( change != 'equal' ) {
- firstChangeAt = firstChangeAt === null ? i : firstChangeAt;
- lastChangeAt = i;
- }
- }
- // How many characters, starting from `firstChangeAt`, should be removed.
- let deletions = 0;
- // How many characters, starting from `firstChangeAt`, should be inserted.
- let insertions = 0;
- for ( let i = firstChangeAt; i <= lastChangeAt; i++ ) {
- // If there is no change (equal) or delete, the character is existing in `oldText`. We count it for removing.
- if ( diffResult[ i ] != 'insert' ) {
- deletions++;
- }
- // If there is no change (equal) or insert, the character is existing in `newText`. We count it for inserting.
- if ( diffResult[ i ] != 'delete' ) {
- insertions++;
- }
- }
- return { insertions, deletions, firstChangeAt };
- }
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