mirror of
https://gerrit.wikimedia.org/r/mediawiki/extensions/VisualEditor
synced 2024-11-15 18:39:52 +00:00
8f84982e0d
In our test case, offset 12 was mapped to 16, but that should be 11. The problem here was that the offset right before the removal was mapped to right after the removal, but that's only valid if we're dealing with a removal, not when we're dealing with a replacement where we're both removing and inserting data. Change-Id: Ibf3c1463c0de009578cd50736f19bae82669ced8
948 lines
31 KiB
JavaScript
948 lines
31 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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this.changeMarkers = {};
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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( offset );
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// Insert data
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tx.pushReplace( [], insertion );
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// Retain to end of document, if needed (for completeness)
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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 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.pushReplace( data.slice( 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.pushReplace( data.slice( 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.pushReplace( data.slice( 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 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 {Object} 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.getData(),
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i = range.start,
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span = i,
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on = 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[i].type;
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if ( type && type.charAt( 0 ) === '/' ) {
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type = type.substr( 1 );
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}
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if ( data[i].type !== undefined && !ve.dm.nodeFactory.isNodeContent( type ) ) {
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// Structural element opening or closing
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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 ( data[i].type === undefined || data[i].type.charAt( 0 ) !== '/' ) {
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// Character or content element opening
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covered = doc.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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} // otherwise it's a content closing, skip those
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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.length - 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.getMetadata(),
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elements = data[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.length - 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.getMetadata(),
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elements = data[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.length - 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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if ( selected.node.isContent() ) {
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branch = selected.node.getParent();
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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( [data[branchOuterRange.start]], [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( [data[branchOuterRange.end - 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
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* @param {Array} unwrapOuter Oopening elements to unwrap. These must be immediately *outside* the range.
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* @param {Array} wrapOuter Opening elements to wrap around the range.
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* @param {Array} unwrapEach Opening elements to unwrap from each top-level element in the range.
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* @param {Array} wrapEach Opening elements to wrap around each top-level element in the range.
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* @returns {ve.dm.Transaction}
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*/
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ve.dm.Transaction.newFromWrap = function ( doc, range, unwrapOuter, wrapOuter, unwrapEach, wrapEach ) {
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var i, j, unwrapOuterData, startOffset, unwrapEachData, closingUnwrapEach, closingWrapEach,
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tx = new ve.dm.Transaction(),
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depth = 0;
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// Function to generate arrays of closing elements in reverse order
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function closingArray( openings ) {
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var closings = [], i, len = openings.length;
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for ( i = 0; i < len; i++ ) {
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closings[closings.length] = { 'type': '/' + openings[len - i - 1].type };
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}
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return closings;
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}
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closingUnwrapEach = closingArray( unwrapEach );
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closingWrapEach = closingArray( wrapEach );
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// TODO: check for and fix nesting validity like fixupInsertion does
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if ( range.start > unwrapOuter.length ) {
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// 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 mode,l so we pick up any attributes
|
|
tx.pushReplace( unwrapOuterData, 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[i].type !== undefined ) {
|
|
// This is a structural offset
|
|
if ( doc.data[i].type.charAt( 0 ) !== '/' ) {
|
|
// 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( ve.copyArray( unwrapEachData ), 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( ve.copyArray( closingUnwrapEach ), 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( closingArray( unwrapOuter ), closingArray( wrapOuter ) );
|
|
}
|
|
|
|
// Retain up to the end of the document
|
|
if ( range.end < doc.data.length ) {
|
|
tx.pushRetain( doc.data.length - 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
|
|
* @returns {number} Translated offset, as it will be after processing transaction
|
|
*/
|
|
ve.dm.Transaction.prototype.translateOffset = function ( offset, reversed ) {
|
|
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, translate it
|
|
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 ) {
|
|
return new ve.Range( this.translateOffset( range.from, reversed ), this.translateOffset( range.to, reversed ) );
|
|
};
|
|
|
|
/**
|
|
* 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
|
|
} );
|
|
}
|
|
}
|
|
};
|
|
|
|
/**
|
|
* Add a replace operation
|
|
*
|
|
* @method
|
|
* @param {Array} remove Data to remove
|
|
* @param {Array} insert Data to replace 'remove' with
|
|
*/
|
|
ve.dm.Transaction.prototype.pushReplace = function ( remove, insert ) {
|
|
if ( remove.length === 0 && insert.length === 0 ) {
|
|
// Don't push no-ops
|
|
return;
|
|
}
|
|
this.operations.push( {
|
|
'type': 'replace',
|
|
'remove': remove,
|
|
'insert': insert
|
|
} );
|
|
this.lengthDifference += insert.length - remove.length;
|
|
};
|
|
|
|
/**
|
|
* Add a replace metadata operation
|
|
* // TODO: this is a copy/paste of pushRetainMetadata (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
|
|
} );
|
|
};
|
|
|
|
/**
|
|
* Get the change markers for the transaction.
|
|
*
|
|
* Change markers are added using setChangeMarker().
|
|
*
|
|
* @returns {Object} { offset: { markerType: number } }
|
|
*/
|
|
ve.dm.Transaction.prototype.getChangeMarkers = function () {
|
|
return this.changeMarkers;
|
|
};
|
|
|
|
/**
|
|
* Store a change marker to mark a change made while applying the transaction.
|
|
*
|
|
* Markers are stored in the .internal.changed property of elements in the linear model, as well as
|
|
* in the Transaction that effected the changes.
|
|
*
|
|
* The purpose of storing change markers in the linear model is so the linmod->HTML converter can
|
|
* mark what has changed relative to the HTML we originally received. For that reason, change
|
|
* markers only track what has changed relative to the original state of the document. This means
|
|
* we avoid reporting changes that cancel each other out, where possible. For instance, if an
|
|
* element marked 'created' is changed, this doesn't result in an additional change marker.
|
|
* In particular, rolling back a transaction causes all change marking done by that transaction to
|
|
* be undone. For that reason, change markers are stored in the Transaction object as well, so it's
|
|
* easy to undo a transaction's markers when rolling back.
|
|
*
|
|
* Marker types:
|
|
* - 'created': This element was newly created and did not exist in the original document
|
|
* - 'attributes': This element's attributes have changed
|
|
* - 'content': This element's content changed (content-containing elements only)
|
|
* - 'annotations': The annotations within this element changed (content-containing elements only)
|
|
* - 'rebuilt': This element and its children/contents changed in some way, no details available
|
|
*
|
|
* Change markers are numbers, which are incremented when setting a marker and decremented when
|
|
* unsetting it. This is because the same event can occur multiple times for the same element, and
|
|
* we want to be able to keep track of whether all the changes have canceled each other out.
|
|
*
|
|
* @param {number} offset Linear model offset (post-transaction) of the element to mark
|
|
* @param {string} marker Marker type
|
|
* @param {number} [increment=1] Number to add to the change marker counter
|
|
*/
|
|
ve.dm.Transaction.prototype.setChangeMarker = function ( offset, marker, increment ) {
|
|
increment = increment || 1;
|
|
if ( this.changeMarkers[offset] === undefined ) {
|
|
this.changeMarkers[offset] = {};
|
|
}
|
|
if ( this.changeMarkers[offset].created ) {
|
|
// Can't set any other markers on a 'created' element
|
|
return;
|
|
}
|
|
if ( marker === 'created' ) {
|
|
// Clear other markers prior to setting 'created'
|
|
this.changeMarkers[offset] = {};
|
|
}
|
|
if ( this.changeMarkers[offset][marker] === undefined ) {
|
|
this.changeMarkers[offset][marker] = increment;
|
|
} else {
|
|
this.changeMarkers[offset][marker] += increment;
|
|
}
|
|
};
|
|
|
|
/**
|
|
* Clear all change markers.
|
|
*/
|
|
ve.dm.Transaction.prototype.clearChangeMarkers = function () {
|
|
this.changeMarkers = {};
|
|
};
|