mirror of
https://gerrit.wikimedia.org/r/mediawiki/extensions/VisualEditor
synced 2024-09-27 12:16:51 +00:00
9372ca60ad
The way it operated was evil. It did a depth-first search from the root, finding the node using reference equality. For documents with deep structures, this could take a long time. Inez did some profiling and found it was called tens of millions of times on a complex document. Kill getOffsetFromNode() and move its functionality to getOffset(). The logic has been completely rewritten: getOffset() now traverses up from the node rather than down from the root, and pretty much does the reverse of what getNodeFromOffset() does. This should be much more efficient even without offset caching in the node objects (which we may still implement later). Change-Id: I125f9fa423c40db6472e2c4a7c94214218ba3bc7
505 lines
17 KiB
JavaScript
505 lines
17 KiB
JavaScript
/*!
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* VisualEditor DataModel TransactionProcessor class.
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*
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* @copyright 2011-2013 VisualEditor Team and others; see AUTHORS.txt
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* @license The MIT License (MIT); see LICENSE.txt
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*/
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/**
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* DataModel transaction processor.
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*
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* This class reads operations from a transaction and applies them one by one. It's not intended
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* to be used directly; use the .commit() and .rollback() methods of ve.dm.Document.
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*
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* NOTE: Instances of this class are not recyclable: you can only call .process() on them once.
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*
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* @class
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* @param {ve.dm.Document} doc Document
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* @param {ve.dm.Transaction} transaction Transaction
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* @param {boolean} reversed Apply in reverse
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* @constructor
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*/
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ve.dm.TransactionProcessor = function VeDmTransactionProcessor( doc, transaction, reversed ) {
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// Properties
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this.document = doc;
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this.transaction = transaction;
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this.operations = transaction.getOperations();
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this.synchronizer = new ve.dm.DocumentSynchronizer( doc, transaction );
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this.reversed = reversed;
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// Linear model offset that we're currently at. Operations in the transaction are ordered, so
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// the cursor only ever moves forward.
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this.cursor = 0;
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this.metadataCursor = 0;
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// Adjustment used to convert between linear model offsets in the original linear model and
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// in the half-updated linear model.
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this.adjustment = 0;
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// Set and clear are sets of annotations which should be added or removed to content being
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// inserted or retained.
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this.set = new ve.dm.AnnotationSet( this.document.getStore() );
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this.clear = new ve.dm.AnnotationSet( this.document.getStore() );
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};
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/* Static members */
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/* See ve.dm.TransactionProcessor.processors */
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ve.dm.TransactionProcessor.processors = {};
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/* Methods */
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/**
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* Get the next operation.
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*
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* @method
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*/
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ve.dm.TransactionProcessor.prototype.nextOperation = function () {
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return this.operations[this.operationIndex++] || false;
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};
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/**
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* Execute an operation.
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*
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* @method
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* @param {Object} op Operation object to execute
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* @throws {Error} Operation type is not supported
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*/
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ve.dm.TransactionProcessor.prototype.executeOperation = function ( op ) {
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if ( op.type in ve.dm.TransactionProcessor.processors ) {
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ve.dm.TransactionProcessor.processors[op.type].call( this, op );
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} else {
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throw new Error( 'Invalid operation error. Operation type is not supported: ' + op.type );
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}
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};
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/**
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* Advance the main data cursor.
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*
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* @method
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* @param {number} increment Number of positions to increment the cursor by
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*/
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ve.dm.TransactionProcessor.prototype.advanceCursor = function ( increment ) {
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this.cursor += increment;
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this.metadataCursor = 0;
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};
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/**
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* Process all operations.
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*
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* When all operations are done being processed, the document will be synchronized.
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*
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* @method
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*/
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ve.dm.TransactionProcessor.prototype.process = function () {
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var op;
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// This loop is factored this way to allow operations to be skipped over or executed
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// from within other operations
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this.operationIndex = 0;
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while ( ( op = this.nextOperation() ) ) {
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this.executeOperation( op );
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}
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this.synchronizer.synchronize();
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// Mark the transaction as committed or rolled back, as appropriate
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this.transaction.toggleApplied();
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};
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/**
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* Apply the current annotation stacks.
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*
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* This will set all annotations in this.set and clear all annotations in `this.clear` on the data
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* between the offsets `this.cursor` and `this.cursor + to`.
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*
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* @method
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* @param {number} to Offset to stop annotating at, annotating starts at this.cursor
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* @throws {Error} Cannot annotate a branch element
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* @throws {Error} Annotation to be set is already set
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* @throws {Error} Annotation to be cleared is not set
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*/
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ve.dm.TransactionProcessor.prototype.applyAnnotations = function ( to ) {
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var item, isElement, annotated, annotations, i, range, selection,
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store = this.document.getStore();
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if ( this.set.isEmpty() && this.clear.isEmpty() ) {
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return;
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}
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for ( i = this.cursor; i < to; i++ ) {
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item = this.document.data.getData( i );
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isElement = this.document.data.isElementData( i );
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if ( isElement ) {
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if ( !ve.dm.nodeFactory.isNodeContent( this.document.data.getType( i ) ) ) {
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throw new Error( 'Invalid transaction, cannot annotate a non-content element' );
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}
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if ( this.document.data.isCloseElementData( i ) ) {
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// Closing content element, ignore
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continue;
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}
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}
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annotated = isElement ? 'annotations' in item : ve.isArray( item );
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annotations = annotated ?
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new ve.dm.AnnotationSet( store, isElement ? item.annotations : item[1] ) :
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new ve.dm.AnnotationSet( store );
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// Set and clear annotations
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if ( annotations.containsAnyOf( this.set ) ) {
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throw new Error( 'Invalid transaction, annotation to be set is already set' );
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} else {
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annotations.addSet( this.set );
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}
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if ( !annotations.containsAllOf( this.clear ) ) {
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throw new Error( 'Invalid transaction, annotation to be cleared is not set' );
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} else {
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annotations.removeSet( this.clear );
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}
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// Store annotation indexes in linear model
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this.document.data.setAnnotationsAtOffset( i, annotations );
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}
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if ( this.cursor < to ) {
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range = new ve.Range( this.cursor, to );
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selection = this.document.selectNodes(
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new ve.Range(
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this.cursor - this.adjustment,
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to - this.adjustment
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),
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'leaves'
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);
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this.synchronizer.pushAnnotation( new ve.Range( this.cursor, to ) );
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}
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};
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/**
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* Processing methods.
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*
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* Each method is specific to a type of action. Methods are called in the context of a transaction
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* processor, so they work similar to normal methods on the object.
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*
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* @class ve.dm.TransactionProcessor.processors
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* @singleton
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*/
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/**
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* Execute a retain operation.
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*
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* This method is called within the context of a transaction processor instance.
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*
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* This moves the cursor by op.length and applies annotations to the characters that the cursor
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* moved over.
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*
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* @method
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* @param {Object} op Operation object:
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* @param {number} op.length Number of elements to retain
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*/
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ve.dm.TransactionProcessor.processors.retain = function ( op ) {
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this.applyAnnotations( this.cursor + op.length );
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this.advanceCursor( op.length );
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};
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/**
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* Execute a metadata retain operation.
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*
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* This method is called within the context of a transaction processor instance.
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*
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* This moves the metadata cursor by op.length.
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*
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* @method
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* @param {Object} op Operation object:
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* @param {number} op.length Number of elements to retain
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*/
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ve.dm.TransactionProcessor.processors.retainMetadata = function ( op ) {
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this.metadataCursor += op.length;
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};
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/**
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* Execute an annotate operation.
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*
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* This method is called within the context of a transaction processor instance.
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*
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* This will add an annotation to or remove an annotation from `this.set`or `this.clear`.
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*
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* @method
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* @param {Object} op Operation object
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* @param {string} op.method Annotation method, either 'set' to add or 'clear' to remove
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* @param {string} op.bias End point of marker, either 'start' to begin or 'stop' to end
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* @param {string} op.annotation Annotation object to set or clear from content
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* @throws {Error} Invalid annotation method
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*/
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ve.dm.TransactionProcessor.processors.annotate = function ( op ) {
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var target;
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if ( op.method === 'set' ) {
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target = this.reversed ? this.clear : this.set;
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} else if ( op.method === 'clear' ) {
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target = this.reversed ? this.set : this.clear;
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} else {
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throw new Error( 'Invalid annotation method ' + op.method );
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}
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if ( op.bias === 'start' ) {
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target.push( op.annotation );
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} else {
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target.remove( op.annotation );
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}
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// Tree sync is done by applyAnnotations()
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};
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/**
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* Execute an attribute operation.
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*
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* This method is called within the context of a transaction processor instance.
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*
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* This sets the attribute named `op.key` on the element at `this.cursor` to `op.to`, or unsets it if
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* `op.to === undefined`. `op.from `is not checked against the old value, but is used instead of `op.to`
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* in reverse mode. So if `op.from` is incorrect, the transaction will commit fine, but won't roll
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* back correctly.
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*
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* @method
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* @param {Object} op Operation object
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* @param {string} op.key Attribute name
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* @param {Mixed} op.from Old attribute value, or undefined if not previously set
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* @param {Mixed} op.to New attribute value, or undefined to unset
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*/
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ve.dm.TransactionProcessor.processors.attribute = function ( op ) {
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var element = this.document.data.getData( this.cursor ),
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to = this.reversed ? op.from : op.to,
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from = this.reversed ? op.to : op.from;
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if ( element.type === undefined ) {
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throw new Error( 'Invalid element error, cannot set attributes on non-element data' );
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}
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if ( to === undefined ) {
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// Clear
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if ( element.attributes ) {
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delete element.attributes[op.key];
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}
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} else {
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// Automatically initialize attributes object
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if ( !element.attributes ) {
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element.attributes = {};
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}
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// Set
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element.attributes[op.key] = to;
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}
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this.synchronizer.pushAttributeChange(
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this.document.documentNode.getNodeFromOffset( this.cursor + 1 ),
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op.key,
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from, to
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);
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};
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/**
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* Execute a replace operation.
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*
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* This method is called within the context of a transaction processor instance.
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*
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* This replaces a range of linear model data with another at this.cursor, figures out how the model
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* tree needs to be synchronized, and queues this in the DocumentSynchronizer.
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*
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* op.remove isn't checked against the actual data (instead op.remove.length things are removed
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* starting at this.cursor), but it's used instead of op.insert in reverse mode. So if
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* op.remove is incorrect but of the right length, the transaction will commit fine, but won't roll
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* back correctly.
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*
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* @method
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* @param {Object} op Operation object
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* @param {Array} op.remove Linear model data to remove
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* @param {Array} op.insert Linear model data to insert
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*/
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ve.dm.TransactionProcessor.processors.replace = function ( op ) {
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var node, selection, range,
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remove = this.reversed ? op.insert : op.remove,
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insert = this.reversed ? op.remove : op.insert,
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removeMetadata = this.reversed ? op.insertMetadata : op.removeMetadata,
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insertMetadata = this.reversed ? op.removeMetadata : op.insertMetadata,
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removeLinearData = new ve.dm.ElementLinearData( this.document.getStore(), remove ),
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insertLinearData = new ve.dm.ElementLinearData( this.document.getStore(), insert ),
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removeIsContent = removeLinearData.isContentData(),
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insertIsContent = insertLinearData.isContentData(),
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removeHasStructure = removeLinearData.containsElementData(),
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insertHasStructure = insertLinearData.containsElementData(),
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operation = op,
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removeLevel = 0,
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insertLevel = 0,
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i,
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type,
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prevCursor,
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affectedRanges = [],
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scope,
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minInsertLevel = 0,
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coveringRange,
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scopeStart,
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scopeEnd,
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opAdjustment = 0,
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opRemove, opInsert, opRemoveMetadata, opInsertMetadata;
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if ( removeIsContent && insertIsContent ) {
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// Content replacement
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// Update the linear model
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this.document.data.batchSplice( this.cursor, remove.length, insert );
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// Keep the meta linear model in sync
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if ( removeMetadata !== undefined ) {
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this.document.metadata.batchSplice( this.cursor + op.retainMetadata, removeMetadata.length, insertMetadata );
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} else if ( insert.length > remove.length ) {
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this.document.metadata.batchSplice( this.cursor + remove.length, 0, new Array( insert.length - remove.length ) );
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} else if ( insert.length < remove.length ) {
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this.document.metadata.batchSplice( this.cursor + insert.length, remove.length - insert.length, [] );
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}
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this.applyAnnotations( this.cursor + insert.length );
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// Get the node containing the replaced content
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selection = this.document.selectNodes(
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new ve.Range(
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this.cursor - this.adjustment,
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this.cursor - this.adjustment + remove.length
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),
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'leaves'
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);
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node = selection[0].node;
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if (
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!removeHasStructure && !insertHasStructure &&
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selection.length === 1 &&
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node && node.getType() === 'text'
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) {
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// Text-only replacement
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// Queue a resize for the text node
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this.synchronizer.pushResize( node, insert.length - remove.length );
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} else {
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// Replacement is not exclusively text
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// Rebuild all covered nodes
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range = new ve.Range(
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selection[0].nodeOuterRange.start,
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selection[selection.length - 1].nodeOuterRange.end
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);
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this.synchronizer.pushRebuild( range,
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new ve.Range( range.start + this.adjustment,
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range.end + this.adjustment + insert.length - remove.length )
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);
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}
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// Advance the cursor
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this.advanceCursor( insert.length );
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this.adjustment += insert.length - remove.length;
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} else {
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// Structural replacement
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// It's possible that multiple replace operations are needed before the
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// model is back in a consistent state. This loop applies the current
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// replace operation to the linear model, then keeps applying subsequent
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// operations until the model is consistent. We keep track of the changes
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// and queue a single rebuild after the loop finishes.
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while ( true ) {
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if ( operation.type === 'replace' ) {
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opRemove = this.reversed ? operation.insert : operation.remove;
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opInsert = this.reversed ? operation.remove : operation.insert;
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opRemoveMetadata = this.reversed ? operation.insertMetadata : operation.removeMetadata,
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opInsertMetadata = this.reversed ? operation.removeMetadata : operation.insertMetadata,
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// Update the linear model
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this.document.data.batchSplice( this.cursor, opRemove.length, opInsert );
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// Keep the meta linear model in sync
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if ( opRemoveMetadata !== undefined ) {
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this.document.metadata.batchSplice( this.cursor, opRemoveMetadata.length, opInsertMetadata );
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} else if ( opInsert.length > opRemove.length ) {
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this.document.metadata.batchSplice( this.cursor + opRemove.length, 0, new Array( opInsert.length - opRemove.length ) );
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} else if ( opInsert.length < opRemove.length ) {
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this.document.metadata.batchSplice( this.cursor + opInsert.length, opRemove.length - opInsert.length, [] );
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}
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affectedRanges.push( new ve.Range(
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this.cursor - this.adjustment,
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this.cursor - this.adjustment + opRemove.length
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) );
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prevCursor = this.cursor;
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this.advanceCursor( opInsert.length );
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// Paint the removed selection, figure out which nodes were
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// covered, and add their ranges to the affected ranges list
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if ( opRemove.length > 0 ) {
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selection = this.document.selectNodes( new ve.Range(
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prevCursor - this.adjustment,
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prevCursor + opRemove.length - this.adjustment
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), 'siblings' );
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for ( i = 0; i < selection.length; i++ ) {
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affectedRanges.push( selection[i].nodeOuterRange );
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}
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}
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// Walk through the remove and insert data
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// and keep track of the element depth change (level)
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// for each of these two separately. The model is
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// only consistent if both levels are zero.
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for ( i = 0; i < opRemove.length; i++ ) {
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type = opRemove[i].type;
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if ( type !== undefined ) {
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if ( type.charAt( 0 ) === '/' ) {
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// Closing element
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removeLevel--;
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} else {
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// Opening element
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removeLevel++;
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}
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}
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}
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// Keep track of the scope of the insertion
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// Normally this is the node we're inserting into, except if the
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// insertion closes elements it doesn't open (i.e. splits elements),
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// in which case it's the affected ancestor
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for ( i = 0; i < opInsert.length; i++ ) {
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type = opInsert[i].type;
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if ( type !== undefined ) {
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if ( type.charAt( 0 ) === '/' ) {
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// Closing element
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insertLevel--;
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if ( insertLevel < minInsertLevel ) {
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// Closing an unopened element at a higher
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// (more negative) level than before
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// Lazy-initialize scope
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scope = scope || this.document.getNodeFromOffset( prevCursor );
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// Push the full range of the old scope as an affected range
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scopeStart = scope.getOffset();
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scopeEnd = scopeStart + scope.getOuterLength();
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affectedRanges.push( new ve.Range( scopeStart, scopeEnd ) );
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// Update scope
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scope = scope.getParent() || scope;
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}
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} else {
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// Opening element
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insertLevel++;
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}
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}
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}
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// Update adjustment
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this.adjustment += opInsert.length - opRemove.length;
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opAdjustment += opInsert.length - opRemove.length;
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} else {
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// We know that other operations won't cause adjustments, so we
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// don't have to update adjustment
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this.executeOperation( operation );
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}
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if ( removeLevel === 0 && insertLevel === 0 ) {
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// The model is back in a consistent state, so we're done
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break;
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}
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// Get the next operation
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operation = this.nextOperation();
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if ( !operation ) {
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throw new Error( 'Unbalanced set of replace operations found' );
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}
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}
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// From all the affected ranges we have gathered, compute a range that covers all
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// of them, and rebuild that
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coveringRange = ve.Range.newCoveringRange( affectedRanges );
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this.synchronizer.pushRebuild(
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coveringRange,
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new ve.Range(
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coveringRange.start + this.adjustment - opAdjustment,
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coveringRange.end + this.adjustment
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)
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);
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}
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};
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/**
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* Execute a metadata replace operation.
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*
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* This method is called within the context of a transaction processor instance.
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*
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* @method
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* @param {Object} op Operation object
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* @param {Array} op.remove Metadata to remove
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* @param {Array} op.insert Metadata to insert
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*/
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ve.dm.TransactionProcessor.processors.replaceMetadata = function ( op ) {
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var remove = this.reversed ? op.insert : op.remove,
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insert = this.reversed ? op.remove : op.insert;
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this.document.spliceMetadata( this.cursor, this.metadataCursor, remove.length, insert );
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};
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