mirror of
https://gerrit.wikimedia.org/r/mediawiki/extensions/VisualEditor
synced 2024-11-15 18:39:52 +00:00
633 lines
20 KiB
JavaScript
633 lines
20 KiB
JavaScript
/**
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* Creates an ve.dm.TransactionProcessor object.
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*
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* @class
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* @constructor
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*/
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ve.dm.TransactionProcessor = function( model, transaction ) {
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this.model = model;
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this.transaction = transaction;
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this.cursor = 0;
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this.set = [];
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this.clear = [];
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};
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/* Static Members */
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ve.dm.TransactionProcessor.operationMap = {
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// Retain
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'retain': {
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'commit': function( op ) {
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this.retain( op );
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},
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'rollback': function( op ) {
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this.retain( op );
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}
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},
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// Insert
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'insert': {
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'commit': function( op ) {
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this.insert( op );
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},
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'rollback': function( op ) {
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this.remove( op );
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}
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},
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// Remove
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'remove': {
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'commit': function( op ) {
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this.remove( op );
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},
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'rollback': function( op ) {
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this.insert( op );
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}
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},
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'replace': {
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'commit': function( op ) {
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this.replace( op );
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},
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'rollback': function( op ) {
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this.replace( op );
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}
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},
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// Change element attributes
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'attribute': {
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'commit': function( op ) {
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this.attribute( op );
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},
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'rollback': function( op ) {
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this.attribute( op );
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}
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},
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// Change content annotations
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'annotate': {
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'commit': function( op ) {
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this.mark( op );
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},
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'rollback': function( op ) {
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this.mark( op );
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}
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}
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};
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/* Static Methods */
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ve.dm.TransactionProcessor.commit = function( doc, transaction ) {
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var tp = new ve.dm.TransactionProcessor( doc, transaction );
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tp.process( 'commit' );
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};
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ve.dm.TransactionProcessor.rollback = function( doc, transaction ) {
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var tp = new ve.dm.TransactionProcessor( doc, transaction );
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tp.process( 'rollback' );
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};
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/* Methods */
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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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ve.dm.TransactionProcessor.prototype.executeOperation = function( op ) {
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if ( op.type in ve.dm.TransactionProcessor.operationMap ) {
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ve.dm.TransactionProcessor.operationMap[op.type][this.method].call( this, op );
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} else {
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throw 'Invalid operation error. Operation type is not supported: ' + operation.type;
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}
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};
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ve.dm.TransactionProcessor.prototype.process = function( method ) {
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var op;
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this.synchronizer = new ve.dm.DocumentSynchronizer( this.model );
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// Store the method (commit or rollback) and the operations array so executeOperation()
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// can access them easily
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this.method = method;
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this.operations = this.transaction.getOperations();
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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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};
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// TODO: document this. Various arguments are optional or nonoptional in different cases, that's
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// confusing so it needs to be documented well.
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ve.dm.TransactionProcessor.prototype.rebuildNodes = function( newData, oldNodes, parent, index ) {
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var newNodes = ve.dm.DocumentNode.createNodesFromData( newData ),
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remove = 0;
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if ( oldNodes ) {
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// Determine parent and index if not given
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if ( oldNodes[0] === oldNodes[0].getRoot() ) {
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// We know the values for parent and index in this case
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// and don't have to compute them. Override any parent
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// or index parameter passed.
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parent = oldNodes[0];
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index = 0;
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remove = parent.getChildren().length;
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} else {
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parent = parent || oldNodes[0].getParent();
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index = index || parent.indexOf( oldNodes[0] );
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remove = oldNodes.length;
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}
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// Try to preserve the first node
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if (
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// There must be an old and new node to preserve
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newNodes.length &&
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oldNodes.length &&
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// Node types need to match
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newNodes[0].type === oldNodes[0].type &&
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// Only for leaf nodes
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!newNodes[0].hasChildren()
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) {
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var newNode = newNodes.shift(),
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oldNode = oldNodes.shift();
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// Let's just leave this first node in place and adjust it's length
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var newAttributes = newNode.getElement().attributes,
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oldAttributes = oldNode.getElement().attributes;
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if ( oldAttributes || newAttributes ) {
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oldNode.getElement().attributes = newAttributes;
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}
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oldNode.adjustContentLength( newNode.getContentLength() - oldNode.getContentLength() );
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index++;
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remove--;
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}
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}
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ve.batchedSplice( parent, index, remove, newNodes );
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};
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/**
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* Get the parent node that would be affected by inserting given data into it's child.
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*
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* This is used when inserting data that closes and reopens one or more parent nodes into a child
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* node, which requires rebuilding at a higher level.
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*
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* @method
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* @param {ve.Node} node Child node to start from
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* @param {Array} data Data to inspect for closings
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* @returns {ve.Node} Lowest level parent node being affected
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*/
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ve.dm.TransactionProcessor.prototype.getScope = function( node, data ) {
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var i,
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length,
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level = 0,
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max = 0;
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for ( i = 0, length = data.length; i < length; i++ ) {
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if ( typeof data[i].type === 'string' ) {
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level += data[i].type.charAt( 0 ) === '/' ? 1 : -1;
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max = Math.max( max, level );
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}
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}
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if ( max > 0 ) {
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for ( i = 0; i < max; i++ ) {
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node = node.getParent() || node;
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}
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}
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return node;
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};
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ve.dm.TransactionProcessor.prototype.applyAnnotations = function( to, update ) {
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var i,
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j,
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k,
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length,
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annotation,
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changes = 0,
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index;
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// Handle annotations
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if ( this.set.length ) {
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for ( i = 0, length = this.set.length; i < length; i++ ) {
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annotation = this.set[i];
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// Auto-build annotation hash
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if ( annotation.hash === undefined ) {
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annotation.hash = ve.dm.DocumentNode.getHash( annotation );
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}
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for ( j = this.cursor; j < to; j++ ) {
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// Auto-convert to array
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if ( ve.isArray( this.model.data[j] ) ) {
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this.model.data[j].push( annotation );
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} else {
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this.model.data[j] = [this.model.data[j], annotation];
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}
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}
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}
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changes++;
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}
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if ( this.clear.length ) {
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for ( i = 0, length = this.clear.length; i < length; i++ ) {
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annotation = this.clear[i];
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if ( annotation instanceof RegExp ) {
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for ( j = this.cursor; j < to; j++ ) {
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var matches = ve.dm.DocumentNode.getMatchingAnnotations(
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this.model.data[j], annotation
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);
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for ( k = 0; k < matches.length; k++ ) {
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index = this.model.data[j].indexOf( matches[k] );
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if ( index !== -1 ) {
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this.model.data[j].splice( index, 1 );
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}
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}
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// Auto-convert to string
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if ( this.model.data[j].length === 1 ) {
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this.model.data[j] = this.model.data[j][0];
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}
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}
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} else {
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// Auto-build annotation hash
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if ( annotation.hash === undefined ) {
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annotation.hash = ve.dm.DocumentNode.getHash( annotation );
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}
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for ( j = this.cursor; j < to; j++ ) {
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index = ve.dm.DocumentNode.getIndexOfAnnotation(
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this.model.data[j], annotation
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);
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if ( index !== -1 ) {
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this.model.data[j].splice( index, 1 );
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}
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// Auto-convert to string
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if ( this.model.data[j].length === 1 ) {
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this.model.data[j] = this.model.data[j][0];
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}
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}
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}
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}
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changes++;
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}
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if ( update && changes ) {
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var fromNode = this.model.getNodeFromOffset( this.cursor ),
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toNode = this.model.getNodeFromOffset( to );
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this.model.traverseLeafNodes( function( node ) {
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node.emit( 'update' );
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if ( node === toNode ) {
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return false;
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}
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}, fromNode );
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}
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};
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ve.dm.TransactionProcessor.prototype.retain = function( op ) {
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this.applyAnnotations( this.cursor + op.length, true );
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this.cursor += op.length;
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};
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ve.dm.TransactionProcessor.prototype.insert = function( op ) {
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var node,
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index,
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offset,
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scope;
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node = this.model.getNodeFromOffset( this.cursor );
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// Shortcut 1: we're inserting content. We don't need to bother with any structural stuff
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if ( !ve.dm.DocumentNode.containsElementData( op.data ) ) {
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// TODO should we check whether we're at a structural offset, and throw an exception
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// if that's the case? Or can we assume that the transaction is valid at this point?
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// Insert data into linear model
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ve.insertIntoArray( this.model.data, this.cursor, op.data );
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this.applyAnnotations( this.cursor + op.data.length );
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// Update the length of the containing node
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node.adjustContentLength( op.data.length, true );
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node.emit( 'update', this.cursor - offset );
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// Move the cursor
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this.cursor += op.data.length;
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// All done
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return;
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}
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// Determine the scope of the inserted data. If the data is an enclosed piece of structure,
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// this will return node. Otherwise, the data closes one or more nodes, and this will return
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// the first ancestor of node that isn't closed, which is the node that will contain the
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// inserted data entirely.
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scope = this.getScope( node, op.data );
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// Shortcut 2: we're inserting an enclosed piece of structural data at a structural offset
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// that isn't the end of the document.
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if (
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ve.dm.DocumentNode.isStructuralOffset( this.model.data, this.cursor ) &&
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this.cursor != this.model.data.length &&
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scope == node
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) {
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// We're inserting an enclosed element into something else, so we don't have to rebuild
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// the parent node. Just build a node from the inserted data and stick it in
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ve.insertIntoArray( this.model.data, this.cursor, op.data );
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this.applyAnnotations( this.cursor + op.data.length );
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offset = this.model.getOffsetFromNode( node );
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index = node.getIndexFromOffset( this.cursor - offset );
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this.rebuildNodes( op.data, null, node, index );
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} else {
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// This is the non-shortcut case
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// Rebuild scope, which is the node that encloses everything we might have to rebuild
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node = scope;
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offset = this.model.getOffsetFromNode( node );
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if ( offset === -1 ) {
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throw 'Invalid offset error. Node is not in model tree';
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}
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// Perform insert on linear data model
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ve.insertIntoArray( this.model.data, this.cursor, op.data );
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this.applyAnnotations( this.cursor + op.data.length );
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// Synchronize model tree
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this.rebuildNodes(
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this.model.data.slice( offset, offset + node.getElementLength() + op.data.length ),
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[node]
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);
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}
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this.cursor += op.data.length;
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};
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ve.dm.TransactionProcessor.prototype.remove = function( op ) {
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if ( ve.dm.DocumentNode.containsElementData( op.data ) ) {
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// Figure out which nodes are covered by the removal
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var ranges = this.model.selectNodes(
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new ve.Range( this.cursor, this.cursor + op.data.length )
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);
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// Build the list of nodes to rebuild and the data to keep
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var oldNodes = [],
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newData = [],
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parent = null,
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index = null,
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firstKeptNode,
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lastKeptNode,
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i;
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for ( i = 0; i < ranges.length; i++ ) {
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oldNodes.push( ranges[i].node );
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if ( ranges[i].range !== undefined ) {
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// We have to keep part of this node
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if ( firstKeptNode === undefined ) {
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// This is the first node we're keeping
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firstKeptNode = ranges[i].node;
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}
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// Compute the start and end offset of this node
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// We could do that with getOffsetFromNode() but
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// we already have all the numbers we need so why would we
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var startOffset = ranges[i].globalRange.start - ranges[i].range.start,
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endOffset = startOffset + ranges[i].node.getContentLength(),
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// Get this node's data
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nodeData = this.model.data.slice( startOffset, endOffset );
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// Remove data covered by the range from nodeData
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nodeData.splice(
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ranges[i].range.start, ranges[i].range.end - ranges[i].range.start
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);
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// What remains in nodeData is the data we need to keep
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// Append it to newData
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newData = newData.concat( nodeData );
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lastKeptNode = ranges[i].node;
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}
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}
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// Surround newData with the right openings and closings if needed
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if ( firstKeptNode !== undefined ) {
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// There are a number of conceptually different cases here,
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// but the algorithm for dealing with them is the same.
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// 1. Removal within one node: firstKeptNode === lastKeptNode
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// 2. Merge of siblings: firstKeptNode.getParent() === lastKeptNode.getParent()
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// 3. Merge of arbitrary depth: firstKeptNode and lastKeptNode have a common ancestor
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// Because #1 and #2 are special cases of #3 (merges with depth=0 and depth=1,
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// respectively), the code below that deals with the general case (#3) and automatically
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// covers #1 and #2 that way as well.
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// Simultaneously traverse upwards from firstKeptNode and lastKeptNode
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// to find the common ancestor. On our way up, keep the element of each
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// node we visit and verify that the transaction is a valid merge (i.e. it satisfies
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// the merge criteria in prepareRemoval()'s canMerge()).
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// FIXME: The code is essentially the same as canMerge(), merge these algorithms
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var openings = [],
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closings = [],
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paths = ve.Node.getCommonAncestorPaths( firstKeptNode, lastKeptNode ),
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prevN1,
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prevN2;
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if ( !paths ) {
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throw 'Removal is not a valid merge: ' +
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'nodes do not have a common ancestor or are not at the same depth';
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}
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for ( i = 0; i < paths.node1Path.length; i++ ) {
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// Verify the element types are equal
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if ( paths.node1Path[i].getElementType() !== paths.node2Path[i].getElementType() ) {
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throw 'Removal is not a valid merge: ' +
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'corresponding parents have different types ( ' +
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paths.node1Path[i].getElementType() + ' vs ' +
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paths.node2Path[i].getElementType() + ' )';
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}
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// Record the opening of n1 and the closing of n2
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openings.push( paths.node1Path[i].getElement() );
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closings.push( { 'type': '/' + paths.node2Path[i].getElementType() } );
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}
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// Surround newData with the openings and closings
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newData = openings.reverse().concat( newData, closings );
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// Rebuild oldNodes if needed
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// This only happens for merges with depth > 1
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prevN1 = paths.node1Path.length ? paths.node1Path[paths.node1Path.length - 1] : null;
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prevN2 = paths.node2Path.length ? paths.node2Path[paths.node2Path.length - 1] : null;
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if ( prevN1 && prevN1 !== oldNodes[0] ) {
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oldNodes = [ prevN1 ];
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parent = paths.commonAncestor;
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index = parent.indexOf( prevN1 ); // Pass to rebuildNodes() so it's not recomputed
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if ( index === -1 ) {
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throw "Tree corruption detected: node isn't in its parent's children array";
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}
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var foundPrevN2 = false;
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for ( var j = index + 1; !foundPrevN2 && j < parent.getChildren().length; j++ ) {
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oldNodes.push( parent.getChildren()[j] );
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foundPrevN2 = parent.getChildren()[j] === prevN2;
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}
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if ( !foundPrevN2 ) {
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throw "Tree corruption detected: node isn't in its parent's children array";
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}
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}
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}
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// Update the linear model
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this.model.data.splice( this.cursor, op.data.length );
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// Perform the rebuild. This updates the model tree
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this.rebuildNodes( newData, oldNodes, parent, index );
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} else {
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// We're removing content only. Take a shortcut
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// Get the node we are removing content from
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var node = this.model.getNodeFromOffset( this.cursor );
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// Update model tree
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node.adjustContentLength( -op.data.length, true );
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// Update the linear model
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this.model.data.splice( this.cursor, op.data.length );
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// Emit an update so things sync up
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var offset = this.model.getOffsetFromNode( node );
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node.emit( 'update', this.cursor - offset );
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}
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};
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ve.dm.TransactionProcessor.prototype.replace = function( op ) {
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var invert = this.method == 'rollback',
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remove = invert ? op.replacement : op.remove,
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replacement = invert ? op.remove : op.replacement,
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removeHasStructure = ve.dm.DocumentNode.containsElementData( remove ),
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replacementHasStructure = ve.dm.DocumentNode.containsElementData( replacement ),
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node;
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// remove is provided only for OT / conflict resolution and for
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// reversibility, we don't actually verify it here
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// Tree synchronization
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// Figure out if this is a structural replacement or a content replacement
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if ( !ve.dm.DocumentNode.containsElementData( remove ) && !ve.dm.DocumentNode.containsElementData( replacement ) ) {
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// Content replacement
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// Update the linear model
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ve.batchedSplice( this.model.data, this.cursor, remove.length, replacement );
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this.applyAnnotations( this.cursor + replacement.length );
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// Get the node containing the replaced content
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node = this.model.getNodeFromOffset( this.cursor );
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// Queue a resize for this node
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this.synchronizer.pushResize( node, replacement.length - remove.length );
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// Advance the cursor
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this.cursor += replacement.length;
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} else {
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// Structural replacement
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// TODO generalize for insert/remove
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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.
|
|
var operation = op,
|
|
removeLevel = 0,
|
|
replaceLevel = 0,
|
|
startOffset = this.cursor,
|
|
adjustment = 0,
|
|
i,
|
|
type;
|
|
|
|
while ( true ) {
|
|
if ( operation.type == 'replace' ) {
|
|
var opRemove = invert ? operation.replacement : operation.remove,
|
|
opReplacement = invert ? operation.remove : operation.replacement;
|
|
// Update the linear model for this replacement
|
|
ve.batchedSplice( this.model.data, this.cursor, opRemove.length, opReplacement );
|
|
this.cursor += opReplacement.length;
|
|
adjustment += opReplacement.length - opRemove.length;
|
|
|
|
// Walk through the remove and replacement data
|
|
// and keep track of the element depth change (level)
|
|
// for each of these two separately. The model is
|
|
// only consistent if both levels are zero.
|
|
for ( i = 0; i < opRemove.length; i++ ) {
|
|
type = opRemove[i].type;
|
|
if ( type === undefined ) {
|
|
// This is content, ignore
|
|
} else if ( type.charAt( 0 ) === '/' ) {
|
|
// Closing element
|
|
removeLevel--;
|
|
} else {
|
|
// Opening element
|
|
removeLevel++;
|
|
}
|
|
}
|
|
for ( i = 0; i < opReplacement.length; i++ ) {
|
|
type = opReplacement[i].type;
|
|
if ( type === undefined ) {
|
|
// This is content, ignore
|
|
} else if ( type.charAt( 0 ) === '/' ) {
|
|
// Closing element
|
|
replaceLevel--;
|
|
} else {
|
|
// Opening element
|
|
replaceLevel++;
|
|
}
|
|
}
|
|
} else {
|
|
// We're assuming that other operations will not cause
|
|
// adjustments.
|
|
// TODO actually make this the case by folding insert
|
|
// and delete into replace
|
|
this.executeOperation( operation );
|
|
}
|
|
|
|
if ( removeLevel === 0 && replaceLevel === 0 ) {
|
|
// The model is back in a consistent state, so we're done
|
|
break;
|
|
}
|
|
|
|
// Get the next operation
|
|
operation = this.nextOperation();
|
|
if ( !operation ) {
|
|
throw 'Unbalanced set of replace operations found';
|
|
}
|
|
}
|
|
// Queue a rebuild for the replaced node
|
|
this.synchronizer.pushRebuild( new ve.Range( startOffset, this.cursor - adjustment ),
|
|
new ve.Range( startOffset, this.cursor ) );
|
|
}
|
|
};
|
|
|
|
ve.dm.TransactionProcessor.prototype.attribute = function( op ) {
|
|
var invert = this.method == 'rollback',
|
|
element = this.model.data[this.cursor];
|
|
if ( element.type === undefined ) {
|
|
throw 'Invalid element error. Can not set attributes on non-element data.';
|
|
}
|
|
var to = invert ? op.from : op.to;
|
|
if ( to === undefined ) {
|
|
// Clear
|
|
if ( element.attributes ) {
|
|
delete element.attributes[op.key];
|
|
}
|
|
// Automatically clean up attributes object
|
|
var empty = true;
|
|
for ( var key in element.attributes ) {
|
|
empty = false;
|
|
break;
|
|
}
|
|
if ( empty ) {
|
|
delete element.attributes;
|
|
}
|
|
} else {
|
|
// Automatically initialize attributes object
|
|
if ( !element.attributes ) {
|
|
element.attributes = {};
|
|
}
|
|
// Set
|
|
element.attributes[op.key] = to;
|
|
}
|
|
var node = this.model.getNodeFromOffset( this.cursor + 1 );
|
|
if ( node.hasChildren() ) {
|
|
node.traverseLeafNodes( function( leafNode ) {
|
|
leafNode.emit( 'update' );
|
|
} );
|
|
} else {
|
|
node.emit( 'update' );
|
|
}
|
|
};
|
|
|
|
ve.dm.TransactionProcessor.prototype.mark = function( op ) {
|
|
var invert = this.method == 'rollback',
|
|
target;
|
|
if ( ( op.method === 'set' && !invert ) || ( op.method === 'clear' && invert ) ) {
|
|
target = this.set;
|
|
} else if ( ( op.method === 'clear' && !invert ) || ( op.method === 'set' && invert ) ) {
|
|
target = this.clear;
|
|
} else {
|
|
throw 'Invalid method error. Can not operate attributes this way: ' + method;
|
|
}
|
|
if ( op.bias === 'start' ) {
|
|
target.push( op.annotation );
|
|
} else if ( op.bias === 'stop' ) {
|
|
var index;
|
|
if ( op.annotation instanceof RegExp ) {
|
|
index = target.indexOf( op.annotation );
|
|
} else {
|
|
index = ve.dm.DocumentNode.getIndexOfAnnotation( target, op.annotation );
|
|
}
|
|
if ( index === -1 ) {
|
|
throw 'Annotation stack error. Annotation is missing.';
|
|
}
|
|
target.splice( index, 1 );
|
|
}
|
|
};
|