mirror of
https://gerrit.wikimedia.org/r/mediawiki/extensions/VisualEditor
synced 2024-11-16 19:09:29 +00:00
981 lines
32 KiB
JavaScript
981 lines
32 KiB
JavaScript
/*!
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* VisualEditor DataModel Transaction 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.
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*
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* @class
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* @constructor
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*/
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ve.dm.Transaction = function VeDmTransaction() {
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this.operations = [];
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this.lengthDifference = 0;
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this.applied = false;
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};
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/* Static Methods */
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/**
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* Generate a transaction that inserts data at an offset.
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*
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* @static
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* @method
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* @param {ve.dm.Document} doc Document to create transaction for
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* @param {number} offset Offset to insert at
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* @param {Array} data Data to insert
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* @returns {ve.dm.Transaction} Transaction that inserts data
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*/
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ve.dm.Transaction.newFromInsertion = function ( doc, offset, insertion ) {
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var tx = new ve.dm.Transaction(),
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data = doc.getData();
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// Fix up the insertion
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insertion = doc.fixupInsertion( insertion, offset );
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// Retain up to insertion point, if needed
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tx.pushRetain( insertion.offset );
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// Insert data
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tx.pushReplace( doc, offset, 0, insertion.data );
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// Retain to end of document, if needed (for completeness)
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tx.pushRetain( data.length - insertion.offset );
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return tx;
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};
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/**
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* Generate a transaction that removes data from a range.
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*
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* There are three possible results from a removal:
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*
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* - Remove content only
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* - Occurs when the range starts and ends on elements of different type, depth or ancestry
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* - Remove entire elements and their content
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* - Occurs when the range spans across an entire element
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* - Merge two elements by removing the end of one and the beginning of another
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* - Occurs when the range starts and ends on elements of similar type, depth and ancestry
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*
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* This function uses the following logic to decide what to actually remove:
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*
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* 1. Elements are only removed if range being removed covers the entire element
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* 2. Elements can only be merged if {@link ve.dm.Node#canBeMergedWith} returns true
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* 3. Merges take place at the highest common ancestor
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*
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* @method
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* @param {ve.dm.Document} doc Document to create transaction for
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* @param {ve.Range} range Range of data to remove
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* @returns {ve.dm.Transaction} Transaction that removes data
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* @throws {Error} Invalid range
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*/
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ve.dm.Transaction.newFromRemoval = function ( doc, range ) {
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var i, selection, first, last, nodeStart, nodeEnd,
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offset = 0,
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removeStart = null,
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removeEnd = null,
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tx = new ve.dm.Transaction(),
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data = doc.getData();
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// Validate range
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if ( range.isCollapsed() ) {
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// Empty range, nothing to remove, retain up to the end of the document (for completeness)
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tx.pushRetain( data.length );
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return tx;
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}
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// Select nodes and validate selection
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selection = doc.selectNodes( range, 'covered' );
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if ( selection.length === 0 ) {
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// Empty selection? Something is wrong!
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throw new Error( 'Invalid range, cannot remove from ' + range.start + ' to ' + range.end );
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}
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first = selection[0];
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last = selection[selection.length - 1];
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// If the first and last node are mergeable, merge them
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if ( first.node.canBeMergedWith( last.node ) ) {
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if ( !first.range && !last.range ) {
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// First and last node are both completely covered, remove them
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removeStart = first.nodeOuterRange.start;
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removeEnd = last.nodeOuterRange.end;
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} else {
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// Either the first node or the last node is partially covered, so remove
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// the selected content
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removeStart = ( first.range || first.nodeRange ).start;
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removeEnd = ( last.range || last.nodeRange ).end;
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}
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tx.pushRetain( removeStart );
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tx.addSafeRemoveOps( doc, removeStart, removeEnd );
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tx.pushRetain( data.length - removeEnd );
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// All done
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return tx;
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}
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// The selection wasn't mergeable, so remove nodes that are completely covered, and strip
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// nodes that aren't
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for ( i = 0; i < selection.length; i++ ) {
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if ( !selection[i].range ) {
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// Entire node is covered, remove it
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nodeStart = selection[i].nodeOuterRange.start;
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nodeEnd = selection[i].nodeOuterRange.end;
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} else {
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// Part of the node is covered, remove that range
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nodeStart = selection[i].range.start;
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nodeEnd = selection[i].range.end;
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}
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// Merge contiguous removals. Only apply a removal when a gap appears, or at the
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// end of the loop
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if ( removeEnd === null ) {
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// First removal
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removeStart = nodeStart;
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removeEnd = nodeEnd;
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} else if ( removeEnd === nodeStart ) {
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// Merge this removal into the previous one
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removeEnd = nodeEnd;
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} else {
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// There is a gap between the previous removal and this one
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// Push the previous removal first
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tx.pushRetain( removeStart - offset );
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tx.addSafeRemoveOps( doc, removeStart, removeEnd );
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offset = removeEnd;
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// Now start this removal
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removeStart = nodeStart;
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removeEnd = nodeEnd;
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}
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}
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// Apply the last removal, if any
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if ( removeEnd !== null ) {
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tx.pushRetain( removeStart - offset );
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tx.addSafeRemoveOps( doc, removeStart, removeEnd );
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offset = removeEnd;
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}
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// Retain up to the end of the document
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tx.pushRetain( data.length - offset );
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return tx;
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};
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/**
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* Generate a transaction that replaces the contents of a branch node.
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*
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* The node whose contents are being replaced should be an unrestricted branch node.
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*
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* @param {ve.dm.Document} doc Document to create transaction for
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* @param {ve.dm.Node|ve.Range} nodeOrRange Branch node or inner range of such
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* @param {Array} newData Linear model data to replace the contents of the node with
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* @returns {ve.dm.Transaction} Transaction that replaces the contents of the node
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* @throws {Error} nodeOrRange must be a ve.dm.Node or a ve.Range
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*/
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ve.dm.Transaction.newFromNodeReplacement = function ( doc, nodeOrRange, newData ) {
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var tx = new ve.dm.Transaction(), range = nodeOrRange;
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if ( range instanceof ve.dm.Node ) {
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range = range.getRange();
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}
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if ( !( range instanceof ve.Range ) ) {
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throw new Error( 'nodeOrRange must be a ve.dm.Node or a ve.Range' );
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}
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tx.pushRetain( range.start );
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tx.pushReplace( doc, range.start, range.end - range.start, newData );
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tx.pushRetain( doc.data.getLength() - range.end );
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return tx;
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};
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/**
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* Generate a transaction that changes an attribute.
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*
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* @static
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* @method
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* @param {ve.dm.Document} doc Document to create transaction for
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* @param {number} offset Offset of element
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* @param {string} key Attribute name
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* @param {Mixed} value New value, or undefined to remove the attribute
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* @returns {ve.dm.Transaction} Transaction that changes an element
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* @throws {Error} Cannot set attributes to non-element data
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* @throws {Error} Cannot set attributes on closing element
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*/
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ve.dm.Transaction.newFromAttributeChange = function ( doc, offset, key, value ) {
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var tx = new ve.dm.Transaction(),
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data = doc.getData();
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// Verify element exists at offset
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if ( data[offset].type === undefined ) {
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throw new Error( 'Cannot set attributes to non-element data' );
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}
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// Verify element is not a closing
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if ( data[offset].type.charAt( 0 ) === '/' ) {
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throw new Error( 'Cannot set attributes on closing element' );
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}
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// Retain up to element
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tx.pushRetain( offset );
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// Change attribute
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tx.pushReplaceElementAttribute(
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key, 'attributes' in data[offset] ? data[offset].attributes[key] : undefined, value
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);
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// Retain to end of document
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tx.pushRetain( data.length - offset );
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return tx;
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};
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/**
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* Generate a transaction that annotates content.
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*
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* @static
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* @method
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* @param {ve.dm.Document} doc Document to create transaction for
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* @param {ve.Range} range Range to annotate
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* @param {string} method Annotation mode
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* - `set`: Adds annotation to all content in range
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* - `clear`: Removes instances of annotation from content in range
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* @param {ve.dm.Annotation} annotation Annotation to set or clear
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* @returns {ve.dm.Transaction} Transaction that annotates content
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*/
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ve.dm.Transaction.newFromAnnotation = function ( doc, range, method, annotation ) {
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var covered, type,
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tx = new ve.dm.Transaction(),
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data = doc.data,
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i = range.start,
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span = i,
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on = false,
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insideContentNode = false;
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// Iterate over all data in range, annotating where appropriate
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while ( i < range.end ) {
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type = data.getType( i );
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if (
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( data.isElementData( i ) && !ve.dm.nodeFactory.isNodeContent( type ) ) ||
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( insideContentNode && !data.isCloseElementData( i ) )
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) {
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// Structural element opening or closing, or entering a content node
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if ( on ) {
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tx.pushRetain( span );
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tx.pushStopAnnotating( method, annotation );
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span = 0;
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on = false;
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}
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} else if (
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( !data.isElementData( i ) || !data.isCloseElementData( i ) ) &&
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!insideContentNode
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) {
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// Character or content element opening
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if ( data.isElementData( i ) ) {
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insideContentNode = true;
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}
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covered = data.getAnnotationsFromOffset( i ).contains( annotation );
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if ( ( covered && method === 'set' ) || ( !covered && method === 'clear' ) ) {
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// Skip annotated content
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if ( on ) {
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tx.pushRetain( span );
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tx.pushStopAnnotating( method, annotation );
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span = 0;
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on = false;
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}
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} else {
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// Cover non-annotated content
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if ( !on ) {
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tx.pushRetain( span );
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tx.pushStartAnnotating( method, annotation );
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span = 0;
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on = true;
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}
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}
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} else if ( data.isCloseElementData( i ) ) {
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// Content closing, skip
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insideContentNode = false;
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}
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span++;
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i++;
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}
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tx.pushRetain( span );
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if ( on ) {
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tx.pushStopAnnotating( method, annotation );
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}
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tx.pushRetain( data.getLength() - range.end );
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return tx;
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};
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/**
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* Generate a transaction that inserts metadata elements.
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*
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* @static
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* @method
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* @param {ve.dm.Document} doc Document to create transaction for
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* @param {number} offset Offset of element
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* @param {number} index Index of metadata cursor within element
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* @param {Array} newElements New elements to insert
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* @returns {ve.dm.Transaction} Transaction that inserts the metadata elements
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*/
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ve.dm.Transaction.newFromMetadataInsertion = function ( doc, offset, index, newElements ) {
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var tx = new ve.dm.Transaction(),
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data = doc.metadata,
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elements = data.getData( offset ) || [];
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// Retain up to element
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tx.pushRetain( offset );
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// Retain up to metadata element (second dimension)
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tx.pushRetainMetadata( index );
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// Insert metadata elements
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tx.pushReplaceMetadata(
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[], newElements
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);
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// Retain up to end of metadata elements (second dimension)
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tx.pushRetainMetadata( elements.length - index );
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// Retain to end of document
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tx.pushRetain( data.getLength() - offset );
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return tx;
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};
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/**
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* Generate a transaction that removes metadata elements.
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*
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* @static
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* @method
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* @param {ve.dm.Document} doc Document to create transaction for
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* @param {number} offset Offset of element
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* @param {ve.Range} range Range of metadata to remove
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* @returns {ve.dm.Transaction} Transaction that removes data
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* @throws {Error} Cannot remove metadata from empty list
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* @throws {Error} Range out of bounds
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*/
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ve.dm.Transaction.newFromMetadataRemoval = function ( doc, offset, range ) {
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var selection,
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tx = new ve.dm.Transaction(),
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data = doc.metadata,
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elements = data.getData( offset ) || [];
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if ( !elements.length ) {
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throw new Error( 'Cannot remove metadata from empty list' );
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}
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if ( range.start < 0 || range.end > elements.length ) {
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throw new Error( 'Range out of bounds' );
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}
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selection = elements.slice( range.start, range.end );
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// Retain up to element
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tx.pushRetain( offset );
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// Retain up to metadata element (second dimension)
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tx.pushRetainMetadata( range.start );
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// Remove metadata elements
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tx.pushReplaceMetadata(
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selection, []
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);
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// Retain up to end of metadata elements (second dimension)
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tx.pushRetainMetadata( elements.length - range.end );
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// Retain to end of document
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tx.pushRetain( data.getLength() - offset );
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return tx;
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};
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/**
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* Generate a transaction that relaces a single metadata element.
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*
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* @static
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* @method
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* @param {ve.dm.Document} doc Document to create transaction for
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* @param {number} offset Offset of element
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* @param {number} index Index of metadata cursor within element
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* @param {Object} newElement New element to insert
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* @returns {ve.dm.Transaction} Transaction that removes data
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* @throws {Error} Metadata index out of bounds
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*/
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ve.dm.Transaction.newFromMetadataElementReplacement = function ( doc, offset, index, newElement ) {
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var oldElement,
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tx = new ve.dm.Transaction(),
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data = doc.getMetadata(),
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elements = data[offset] || [];
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if ( index >= elements.length ) {
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throw new Error( 'Metadata index out of bounds' );
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}
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oldElement = elements[index];
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// Retain up to element
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tx.pushRetain( offset );
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// Retain up to metadata element (second dimension)
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tx.pushRetainMetadata( index );
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// Remove metadata elements
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tx.pushReplaceMetadata(
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[ oldElement ], [ newElement ]
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);
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// Retain up to end of metadata elements (second dimension)
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tx.pushRetainMetadata( elements.length - index - 1 );
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// Retain to end of document
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tx.pushRetain( data.length - offset );
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return tx;
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};
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/**
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* Generate a transaction that converts elements that can contain content.
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*
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* @static
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* @method
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* @param {ve.dm.Document} doc Document to create transaction for
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* @param {ve.Range} range Range to convert
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* @param {string} type Symbolic name of element type to convert to
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* @param {Object} attr Attributes to initialize element with
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* @returns {ve.dm.Transaction} Transaction that converts content branches
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*/
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ve.dm.Transaction.newFromContentBranchConversion = function ( doc, range, type, attr ) {
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var i, selected, branch, branchOuterRange,
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tx = new ve.dm.Transaction(),
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data = doc.getData(),
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selection = doc.selectNodes( range, 'leaves' ),
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opening = { 'type': type },
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closing = { 'type': '/' + type },
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previousBranch,
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previousBranchOuterRange;
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// Add attributes to opening if needed
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if ( ve.isPlainObject( attr ) ) {
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opening.attributes = attr;
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} else {
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attr = {};
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}
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// Replace the wrappings of each content branch in the range
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for ( i = 0; i < selection.length; i++ ) {
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selected = selection[i];
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branch = selected.node.isContent() ? selected.node.getParent() : selected.node;
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if ( branch.canContainContent() ) {
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// Skip branches that are already of the target type and have identical attributes
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if ( branch.getType() === type && ve.compareObjects( branch.getAttributes(), attr ) ) {
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continue;
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}
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branchOuterRange = branch.getOuterRange();
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// Don't convert the same branch twice
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if ( branch === previousBranch ) {
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continue;
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}
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// Retain up to this branch, considering where the previous one left off
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tx.pushRetain(
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branchOuterRange.start - ( previousBranch ? previousBranchOuterRange.end : 0 )
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);
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// Replace the opening
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tx.pushReplace( doc, branchOuterRange.start, 1, [ve.copyObject( opening )] );
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// Retain the contents
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tx.pushRetain( branch.getLength() );
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// Replace the closing
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tx.pushReplace( doc, branchOuterRange.end - 1, 1, [ve.copyObject( closing )] );
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// Remember this branch and its range for next time
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previousBranch = branch;
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previousBranchOuterRange = branchOuterRange;
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}
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}
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// Retain until the end
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tx.pushRetain(
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data.length - ( previousBranch ? previousBranchOuterRange.end : 0 )
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);
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return tx;
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};
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/**
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* Generate a transaction that wraps, unwraps or replaces structure.
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*
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* The unwrap parameters are checked against the actual model data, and
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* an exception is thrown if the type fields don't match. This means you
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* can omit attributes from the unwrap parameters, those are automatically
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* picked up from the model data instead.
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*
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* NOTE: This function currently does not fix invalid parent/child relationships, so it will
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* happily convert paragraphs to listItems without wrapping them in a list if that's what you
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* ask it to do. We'll probably fix this later but for now the caller is responsible for giving
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* valid instructions.
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*
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* Changing a paragraph to a header:
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* Before: [ {'type': 'paragraph'}, 'a', 'b', 'c', {'type': '/paragraph'} ]
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* newFromWrap( new ve.Range( 1, 4 ), [ {'type': 'paragraph'} ], [ {'type': 'heading', 'level': 1 } ] );
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* After: [ {'type': 'heading', 'level': 1 }, 'a', 'b', 'c', {'type': '/heading'} ]
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*
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* Changing a set of paragraphs to a list:
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* Before: [ {'type': 'paragraph'}, 'a', {'type': '/paragraph'}, {'type':'paragraph'}, 'b', {'type':'/paragraph'} ]
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* newFromWrap( new ve.Range( 0, 6 ), [], [ {'type': 'list' } ], [], [ {'type': 'listItem', 'attributes': {'styles': ['bullet']}} ] );
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* After: [ {'type': 'list'}, {'type': 'listItem', 'attributes': {'styles': ['bullet']}}, {'type':'paragraph'} 'a',
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* {'type': '/paragraph'}, {'type': '/listItem'}, {'type': 'listItem', 'attributes': {'styles': ['bullet']}},
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* {'type': 'paragraph'}, 'b', {'type': '/paragraph'}, {'type': '/listItem'}, {'type': '/list'} ]
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*
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* @param {ve.dm.Document} doc Document to generate a transaction for
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* @param {ve.Range} range Range to wrap/unwrap/replace around
|
|
* @param {Array} unwrapOuter Opening elements to unwrap. These must be immediately *outside* the range
|
|
* @param {Array} wrapOuter Opening elements to wrap around the range
|
|
* @param {Array} unwrapEach Opening elements to unwrap from each top-level element in the range
|
|
* @param {Array} wrapEach Opening elements to wrap around each top-level element in the range
|
|
* @returns {ve.dm.Transaction}
|
|
*/
|
|
ve.dm.Transaction.newFromWrap = function ( doc, range, unwrapOuter, wrapOuter, unwrapEach, wrapEach ) {
|
|
var i, j, unwrapOuterData, startOffset, unwrapEachData, closingUnwrapEach, closingWrapEach,
|
|
tx = new ve.dm.Transaction(),
|
|
depth = 0;
|
|
|
|
// Function to generate arrays of closing elements in reverse order
|
|
function closingArray( openings ) {
|
|
var closings = [], i, len = openings.length;
|
|
for ( i = 0; i < len; i++ ) {
|
|
closings[closings.length] = { 'type': '/' + openings[len - i - 1].type };
|
|
}
|
|
return closings;
|
|
}
|
|
closingUnwrapEach = closingArray( unwrapEach );
|
|
closingWrapEach = closingArray( wrapEach );
|
|
|
|
// TODO: check for and fix nesting validity like fixupInsertion does
|
|
if ( range.start > unwrapOuter.length ) {
|
|
// Retain up to the first thing we're unwrapping
|
|
// The outer unwrapping takes place *outside*
|
|
// the range, so compensate for that
|
|
tx.pushRetain( range.start - unwrapOuter.length );
|
|
} else if ( range.start < unwrapOuter.length ) {
|
|
throw new Error( 'unwrapOuter is longer than the data preceding the range' );
|
|
}
|
|
|
|
// Replace the opening elements for the outer unwrap&wrap
|
|
if ( wrapOuter.length > 0 || unwrapOuter.length > 0 ) {
|
|
// Verify that wrapOuter matches the data at this position
|
|
unwrapOuterData = doc.data.slice( range.start - unwrapOuter.length, range.start );
|
|
for ( i = 0; i < unwrapOuterData.length; i++ ) {
|
|
if ( unwrapOuterData[i].type !== unwrapOuter[i].type ) {
|
|
throw new Error( 'Element in unwrapOuter does not match: expected ' +
|
|
unwrapOuter[i].type + ' but found ' + unwrapOuterData[i].type );
|
|
}
|
|
}
|
|
// Instead of putting in unwrapOuter as given, put it in the
|
|
// way it appears in the model so we pick up any attributes
|
|
tx.pushReplace( doc, range.start - unwrapOuter.length, unwrapOuter.length, ve.copyArray( wrapOuter ) );
|
|
}
|
|
|
|
if ( wrapEach.length > 0 || unwrapEach.length > 0 ) {
|
|
// Visit each top-level child and wrap/unwrap it
|
|
// TODO figure out if we should use the tree/node functions here
|
|
// rather than iterating over offsets, it may or may not be faster
|
|
for ( i = range.start; i < range.end; i++ ) {
|
|
if ( doc.data.isElementData( i ) ) {
|
|
// This is a structural offset
|
|
if ( !doc.data.isCloseElementData( i ) ) {
|
|
// This is an opening element
|
|
if ( depth === 0 ) {
|
|
// We are at the start of a top-level element
|
|
// Replace the opening elements
|
|
|
|
// Verify that unwrapEach matches the data at this position
|
|
unwrapEachData = doc.data.slice( i, i + unwrapEach.length );
|
|
for ( j = 0; j < unwrapEachData.length; j++ ) {
|
|
if ( unwrapEachData[j].type !== unwrapEach[j].type ) {
|
|
throw new Error( 'Element in unwrapEach does not match: expected ' +
|
|
unwrapEach[j].type + ' but found ' +
|
|
unwrapEachData[j].type );
|
|
}
|
|
}
|
|
// Instead of putting in unwrapEach as given, put it in the
|
|
// way it appears in the model, so we pick up any attributes
|
|
tx.pushReplace( doc, i, unwrapEach.length, ve.copyArray( wrapEach ) );
|
|
|
|
// Store this offset for later
|
|
startOffset = i;
|
|
}
|
|
depth++;
|
|
} else {
|
|
// This is a closing element
|
|
depth--;
|
|
if ( depth === 0 ) {
|
|
// We are at the end of a top-level element
|
|
// Retain the contents of what we're wrapping
|
|
tx.pushRetain( i - startOffset + 1 - unwrapEach.length*2 );
|
|
// Replace the closing elements
|
|
tx.pushReplace( doc, i + 1 - unwrapEach.length, unwrapEach.length, ve.copyArray( closingWrapEach ) );
|
|
}
|
|
}
|
|
}
|
|
}
|
|
} else {
|
|
// There is no wrapEach/unwrapEach to be done, just retain
|
|
// up to the end of the range
|
|
tx.pushRetain( range.end - range.start );
|
|
}
|
|
|
|
if ( wrapOuter.length > 0 || unwrapOuter.length > 0 ) {
|
|
tx.pushReplace( doc, range.end, unwrapOuter.length, closingArray( wrapOuter ) );
|
|
}
|
|
|
|
// Retain up to the end of the document
|
|
if ( range.end < doc.data.getLength() ) {
|
|
tx.pushRetain( doc.data.getLength() - range.end - unwrapOuter.length );
|
|
}
|
|
|
|
return tx;
|
|
};
|
|
|
|
/* Methods */
|
|
|
|
/**
|
|
* Check if the transaction would make any actual changes if processed.
|
|
*
|
|
* There may be more sophisticated checks that can be done, like looking for things being replaced
|
|
* with identical content, but such transactions probably should not be created in the first place.
|
|
*
|
|
* @method
|
|
* @returns {boolean} Transaction is no-op
|
|
*/
|
|
ve.dm.Transaction.prototype.isNoOp = function () {
|
|
return (
|
|
this.operations.length === 0 ||
|
|
( this.operations.length === 1 && this.operations[0].type === 'retain' )
|
|
);
|
|
};
|
|
|
|
/**
|
|
* Get all operations.
|
|
*
|
|
* @method
|
|
* @returns {Object[]} List of operations
|
|
*/
|
|
ve.dm.Transaction.prototype.getOperations = function () {
|
|
return this.operations;
|
|
};
|
|
|
|
/**
|
|
* Check if the transaction has any operations with a certain type.
|
|
*
|
|
* @method
|
|
* @returns {boolean} Has operations of a given type
|
|
*/
|
|
ve.dm.Transaction.prototype.hasOperationWithType = function ( type ) {
|
|
var i, len;
|
|
for ( i = 0, len = this.operations.length; i < len; i++ ) {
|
|
if ( this.operations[i].type === type ) {
|
|
return true;
|
|
}
|
|
}
|
|
return false;
|
|
};
|
|
|
|
/**
|
|
* Check if the transaction has any content data operations, such as insertion or deletion.
|
|
*
|
|
* @method
|
|
* @returns {boolean} Has content data operations
|
|
*/
|
|
ve.dm.Transaction.prototype.hasContentDataOperations = function () {
|
|
return this.hasOperationWithType( 'replace' );
|
|
};
|
|
|
|
/**
|
|
* Check if the transaction has any element attribute operations.
|
|
*
|
|
* @method
|
|
* @returns {boolean} Has element attribute operations
|
|
*/
|
|
ve.dm.Transaction.prototype.hasElementAttributeOperations = function () {
|
|
return this.hasOperationWithType( 'attribute' );
|
|
};
|
|
|
|
/**
|
|
* Check if the transaction has any annotation operations.
|
|
*
|
|
* @method
|
|
* @returns {boolean} Has annotation operations
|
|
*/
|
|
ve.dm.Transaction.prototype.hasAnnotationOperations = function () {
|
|
return this.hasOperationWithType( 'annotate' );
|
|
};
|
|
|
|
/**
|
|
* Get the difference in content length the transaction will cause if applied.
|
|
*
|
|
* @method
|
|
* @returns {number} Difference in content length
|
|
*/
|
|
ve.dm.Transaction.prototype.getLengthDifference = function () {
|
|
return this.lengthDifference;
|
|
};
|
|
|
|
/**
|
|
* Check whether the transaction has already been applied.
|
|
*
|
|
* A transaction that has been applied can be rolled back, at which point it will no longer be
|
|
* considered applied. In other words, this function returns false if the transaction can be
|
|
* committed, and true if the transaction can be rolled back.
|
|
*
|
|
* @method
|
|
* @returns {boolean}
|
|
*/
|
|
ve.dm.Transaction.prototype.hasBeenApplied = function () {
|
|
return this.applied;
|
|
};
|
|
|
|
/**
|
|
* Toggle the applied state of the transaction.
|
|
*
|
|
* Should only be called after committing or rolling back the transaction.
|
|
*
|
|
* @see ve.dm.Transaction#hasBeenApplied
|
|
*/
|
|
ve.dm.Transaction.prototype.toggleApplied = function () {
|
|
this.applied = !this.applied;
|
|
};
|
|
|
|
/**
|
|
* Translate an offset based on a transaction.
|
|
*
|
|
* This is useful when you want to anticipate what an offset will be after a transaction is
|
|
* processed.
|
|
*
|
|
* @method
|
|
* @param {number} offset Offset in the linear model before the transaction has been processed
|
|
* @param {boolean} [reversed] Reverse the translation, i.e. translate based on a rollback
|
|
* @param {boolean} [excludeInsertion] Map the offset immediately before an insertion to
|
|
* right before the insertion rather than right after
|
|
* @returns {number} Translated offset, as it will be after processing transaction
|
|
*/
|
|
ve.dm.Transaction.prototype.translateOffset = function ( offset, reversed, excludeInsertion ) {
|
|
var i, op, insertLength, removeLength, prevAdjustment, cursor = 0, adjustment = 0;
|
|
for ( i = 0; i < this.operations.length; i++ ) {
|
|
op = this.operations[i];
|
|
if ( op.type === 'replace' ) {
|
|
insertLength = reversed ? op.remove.length : op.insert.length;
|
|
removeLength = reversed ? op.insert.length : op.remove.length;
|
|
prevAdjustment = adjustment;
|
|
adjustment += insertLength - removeLength;
|
|
if ( offset === cursor + removeLength ) {
|
|
// Offset points to right after the removal or right before the insertion
|
|
if ( excludeInsertion && insertLength > removeLength ) {
|
|
// Translate it to before the insertion
|
|
return offset + adjustment - insertLength + removeLength;
|
|
} else {
|
|
// Translate it to after the removal/insertion
|
|
return offset + adjustment;
|
|
}
|
|
} else if ( offset === cursor ) {
|
|
// The offset points to right before the removal or replacement
|
|
if ( insertLength === 0 ) {
|
|
// Translate it to after the removal
|
|
return cursor + removeLength + adjustment;
|
|
} else {
|
|
// Translate it to before the replacement
|
|
// To translate this correctly, we have to use adjustment as it was before
|
|
// we adjusted it for this replacement
|
|
return cursor + prevAdjustment;
|
|
}
|
|
} else if ( offset > cursor && offset < cursor + removeLength ) {
|
|
// The offset points inside of the removal
|
|
// Translate it to after the removal
|
|
return cursor + removeLength + adjustment;
|
|
}
|
|
cursor += removeLength;
|
|
} else if ( op.type === 'retain' ) {
|
|
if ( offset >= cursor && offset < cursor + op.length ) {
|
|
return offset + adjustment;
|
|
}
|
|
cursor += op.length;
|
|
}
|
|
}
|
|
return offset + adjustment;
|
|
};
|
|
|
|
/**
|
|
* Translate a range based on a transaction.
|
|
*
|
|
* This is useful when you want to anticipate what a selection will be after a transaction is
|
|
* processed.
|
|
*
|
|
* @method
|
|
* @see #translateOffset
|
|
* @param {ve.Range} range Range in the linear model before the transaction has been processed
|
|
* @returns {ve.Range} Translated range, as it will be after processing transaction
|
|
*/
|
|
ve.dm.Transaction.prototype.translateRange = function ( range, reversed ) {
|
|
var start = this.translateOffset( range.start, reversed, true ),
|
|
end = this.translateOffset( range.end, reversed, false );
|
|
return range.isBackwards() ? new ve.Range( end, start ) : new ve.Range( start, end );
|
|
};
|
|
|
|
/**
|
|
* Add a retain operation.
|
|
*
|
|
* @method
|
|
* @param {number} length Length of content data to retain
|
|
* @throws {Error} Cannot retain backwards
|
|
*/
|
|
ve.dm.Transaction.prototype.pushRetain = function ( length ) {
|
|
if ( length < 0 ) {
|
|
throw new Error( 'Invalid retain length, cannot retain backwards:' + length );
|
|
}
|
|
if ( length ) {
|
|
var end = this.operations.length - 1;
|
|
if ( this.operations.length && this.operations[end].type === 'retain' ) {
|
|
this.operations[end].length += length;
|
|
} else {
|
|
this.operations.push( {
|
|
'type': 'retain',
|
|
'length': length
|
|
} );
|
|
}
|
|
}
|
|
};
|
|
|
|
/**
|
|
* Add a retain metadata operation.
|
|
* // TODO: this is a copy/paste of pushRetain (at the moment). Consider a refactor.
|
|
*
|
|
* @method
|
|
* @param {number} length Length of content data to retain
|
|
* @throws {Error} Cannot retain backwards
|
|
*/
|
|
ve.dm.Transaction.prototype.pushRetainMetadata = function ( length ) {
|
|
if ( length < 0 ) {
|
|
throw new Error( 'Invalid retain length, cannot retain backwards:' + length );
|
|
}
|
|
if ( length ) {
|
|
var end = this.operations.length - 1;
|
|
if ( this.operations.length && this.operations[end].type === 'retainMetadata' ) {
|
|
this.operations[end].length += length;
|
|
} else {
|
|
this.operations.push( {
|
|
'type': 'retainMetadata',
|
|
'length': length
|
|
} );
|
|
}
|
|
}
|
|
};
|
|
|
|
/**
|
|
* Adds a replace op to remove the desired range and, where required, splices in retain ops
|
|
* to prevent the deletion of internal data.
|
|
*
|
|
* @param {ve.dm.Document} doc Document
|
|
* @param {number} removeStart Offset to start removing from
|
|
* @param {number} removeEnd Offset to remove to
|
|
*/
|
|
ve.dm.Transaction.prototype.addSafeRemoveOps = function ( doc, removeStart, removeEnd ) {
|
|
var i, retainStart, internalStackDepth = 0;
|
|
// Iterate over removal range and use a stack counter to determine if
|
|
// we are inside an internal node
|
|
for ( i = removeStart; i < removeEnd; i++ ) {
|
|
if ( doc.data.isElementData( i ) && ve.dm.nodeFactory.isNodeInternal( doc.data.getType( i ) ) ) {
|
|
if ( !doc.data.isCloseElementData( i ) ) {
|
|
if ( internalStackDepth === 0 ) {
|
|
this.pushReplace( doc, removeStart, i - removeStart, [] );
|
|
retainStart = i;
|
|
}
|
|
internalStackDepth++;
|
|
} else {
|
|
internalStackDepth--;
|
|
if ( internalStackDepth === 0 ) {
|
|
this.pushRetain( i + 1 - retainStart );
|
|
removeStart = i + 1;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
this.pushReplace( doc, removeStart, removeEnd - removeStart, [] );
|
|
};
|
|
|
|
/**
|
|
* Add a replace operation, keeping metadata in sync if required
|
|
*
|
|
* @method
|
|
* @param {ve.dm.Document} doc Document model
|
|
* @param {number} offset Offset to start at
|
|
* @param {number} removeLength Number of data items to remove
|
|
* @param {Array} insert Data to insert
|
|
*/
|
|
ve.dm.Transaction.prototype.pushReplace = function ( doc, offset, removeLength, insert ) {
|
|
if ( removeLength === 0 && insert.length === 0 ) {
|
|
// Don't push no-ops
|
|
return;
|
|
}
|
|
|
|
var op, end = this.operations.length - 1,
|
|
lastOp = end >= 0 ? this.operations[end] : null,
|
|
remove = doc.getData( new ve.Range( offset, offset + removeLength ) ),
|
|
metadataReplace = doc.getMetadataReplace( offset, removeLength, insert ),
|
|
retainMetadata = metadataReplace.retain,
|
|
removeMetadata = metadataReplace.remove,
|
|
insertMetadata = metadataReplace.insert;
|
|
|
|
if ( lastOp && lastOp.type === 'replace' && !lastOp.removeMetadata && !removeMetadata ) {
|
|
// simple replaces can just be concatenated
|
|
// TODO: allow replaces with meta to be merged?
|
|
lastOp.insert = lastOp.insert.concat( insert );
|
|
lastOp.remove = lastOp.remove.concat( remove );
|
|
} else {
|
|
op = {
|
|
'type': 'replace',
|
|
'remove': remove,
|
|
'insert': insert
|
|
};
|
|
if ( removeMetadata !== undefined ) {
|
|
op.retainMetadata = retainMetadata;
|
|
op.removeMetadata = removeMetadata;
|
|
op.insertMetadata = insertMetadata;
|
|
}
|
|
this.operations.push( op );
|
|
}
|
|
this.lengthDifference += insert.length - remove.length;
|
|
};
|
|
|
|
/**
|
|
* Add a replace metadata operation
|
|
* // TODO: this is a copy/paste of pushReplace (at the moment). Consider a refactor.
|
|
*
|
|
* @method
|
|
* @param {Array} remove Metadata to remove
|
|
* @param {Array} insert Metadata to replace 'remove' with
|
|
*/
|
|
ve.dm.Transaction.prototype.pushReplaceMetadata = function ( remove, insert ) {
|
|
if ( remove.length === 0 && insert.length === 0 ) {
|
|
// Don't push no-ops
|
|
return;
|
|
}
|
|
this.operations.push( {
|
|
'type': 'replaceMetadata',
|
|
'remove': remove,
|
|
'insert': insert
|
|
} );
|
|
};
|
|
|
|
/**
|
|
* Add an element attribute change operation.
|
|
*
|
|
* @method
|
|
* @param {string} key Name of attribute to change
|
|
* @param {Mixed} from Value change attribute from, or undefined if not previously set
|
|
* @param {Mixed} to Value to change attribute to, or undefined to remove
|
|
*/
|
|
ve.dm.Transaction.prototype.pushReplaceElementAttribute = function ( key, from, to ) {
|
|
this.operations.push( {
|
|
'type': 'attribute',
|
|
'key': key,
|
|
'from': from,
|
|
'to': to
|
|
} );
|
|
};
|
|
|
|
/**
|
|
* Add a start annotating operation.
|
|
*
|
|
* @method
|
|
* @param {string} method Method to use, either "set" or "clear"
|
|
* @param {Object} annotation Annotation object to start setting or clearing from content data
|
|
*/
|
|
ve.dm.Transaction.prototype.pushStartAnnotating = function ( method, annotation ) {
|
|
this.operations.push( {
|
|
'type': 'annotate',
|
|
'method': method,
|
|
'bias': 'start',
|
|
'annotation': annotation
|
|
} );
|
|
};
|
|
|
|
/**
|
|
* Add a stop annotating operation.
|
|
*
|
|
* @method
|
|
* @param {string} method Method to use, either "set" or "clear"
|
|
* @param {Object} annotation Annotation object to stop setting or clearing from content data
|
|
*/
|
|
ve.dm.Transaction.prototype.pushStopAnnotating = function ( method, annotation ) {
|
|
this.operations.push( {
|
|
'type': 'annotate',
|
|
'method': method,
|
|
'bias': 'stop',
|
|
'annotation': annotation
|
|
} );
|
|
};
|