mirror of
https://gerrit.wikimedia.org/r/mediawiki/extensions/VisualEditor
synced 2024-12-11 05:56:11 +00:00
f2d08f913b
Previously, Undo used a transaction's lengthDifference to calculate the selection to display after the transaction was undone. Now, translateOffset with the reversed boolean set to true will properly translate the inverse of a transaction's selection change. Fixes bug #40538 Change-Id: I110bc0cbb5824547842efd391b9f2948b037b758
631 lines
21 KiB
JavaScript
631 lines
21 KiB
JavaScript
/**
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* VisualEditor data model Transaction class.
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*
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* @copyright 2011-2012 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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};
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/* Static Methods */
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/**
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* Generates a transaction that inserts data at a given 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} Transcation 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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* Generates a transaction which removes data from a given range.
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*
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* There are three possible results from a removal:
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* 1. 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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* 2. Remove entire elements and their content
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* - Occurs when the range spans across an entire element
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* 3. 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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* 1. Elements are only removed if range being removed covers the entire element
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* 2. Elements can only be merged if 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} Transcation that removes data
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* @throws 'Invalid range, can not remove from {range.start} to {range.end}'
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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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// Normalize and validate range
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range.normalize();
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if ( range.start === range.end ) {
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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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* Generates 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} Transcation that changes an element
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* @throws 'Can not set attributes to non-element data'
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* @throws 'Can not 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( 'Can not 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( 'Can not 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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* Generates 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,
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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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range.normalize();
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while ( i < range.end ) {
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if ( data[i].type !== undefined ) {
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// Element
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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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// Content
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covered = doc.offsetContainsAnnotation( i, 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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}
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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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* Generates 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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* Generates a transaction which 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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* @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 Array of opening elements to unwrap. These must be immediately *outside* the range.
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* @param {Array} wrapOuter Array of opening elements to wrap around the range.
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* @param {Array} unwrapEach Array of opening elements to unwrap from each top-level element in the range.
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* @param {Array} wrapEach Array of 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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* @example 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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* @example 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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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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range.normalize();
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if ( range.start > unwrapOuter.length ) {
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// Retain up to the first thing we're unwrapping
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// The outer unwrapping takes place *outside*
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// the range, so compensate for that
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tx.pushRetain( range.start - unwrapOuter.length );
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} else if ( range.start < unwrapOuter.length ) {
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throw new Error( 'unwrapOuter is longer than the data preceding the range' );
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}
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// Replace the opening elements for the outer unwrap&wrap
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if ( wrapOuter.length > 0 || unwrapOuter.length > 0 ) {
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// Verify that wrapOuter matches the data at this position
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unwrapOuterData = doc.data.slice( range.start - unwrapOuter.length, range.start );
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for ( i = 0; i < unwrapOuterData.length; i++ ) {
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if ( unwrapOuterData[i].type !== unwrapOuter[i].type ) {
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throw new Error( 'Element in unwrapOuter does not match: expected ' +
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unwrapOuter[i].type + ' but found ' + unwrapOuterData[i].type );
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}
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}
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// Instead of putting in unwrapOuter as given, put it in the
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// way it appears in the mode,l so we pick up any attributes
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tx.pushReplace( unwrapOuterData, ve.copyArray( wrapOuter ) );
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}
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if ( wrapEach.length > 0 || unwrapEach.length > 0 ) {
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// Visit each top-level child and wrap/unwrap it
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// TODO figure out if we should use the tree/node functions here
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// rather than iterating over offsets, it may or may not be faster
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for ( i = range.start; i < range.end; i++ ) {
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if ( doc.data[i].type !== undefined ) {
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// This is a structural offset
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if ( doc.data[i].type.charAt( 0 ) !== '/' ) {
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// This is an opening element
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if ( depth === 0 ) {
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// We are at the start of a top-level element
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// Replace the opening elements
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// Verify that unwrapEach matches the data at this position
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unwrapEachData = doc.data.slice( i, i + unwrapEach.length );
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for ( j = 0; j < unwrapEachData.length; j++ ) {
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if ( unwrapEachData[j].type !== unwrapEach[j].type ) {
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throw new Error( 'Element in unwrapEach does not match: expected ' +
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unwrapEach[j].type + ' but found ' +
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unwrapEachData[j].type );
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}
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}
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// Instead of putting in unwrapEach as given, put it in the
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// way it appears in the model, so we pick up any attributes
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tx.pushReplace( ve.copyArray( unwrapEachData ), ve.copyArray( wrapEach ) );
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// Store this offset for later
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startOffset = i;
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}
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depth++;
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} else {
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// This is a closing element
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depth--;
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if ( depth === 0 ) {
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// We are at the end of a top-level element
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// Retain the contents of what we're wrapping
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tx.pushRetain( i - startOffset + 1 - unwrapEach.length*2 );
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// Replace the closing elements
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tx.pushReplace( ve.copyArray( closingUnwrapEach ), ve.copyArray( closingWrapEach ) );
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}
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}
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}
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}
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} else {
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// There is no wrapEach/unwrapEach to be done, just retain
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// up to the end of the range
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tx.pushRetain( range.end - range.start );
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}
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if ( wrapOuter.length > 0 || unwrapOuter.length > 0 ) {
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tx.pushReplace( closingArray( unwrapOuter ), closingArray( wrapOuter ) );
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}
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// Retain up to the end of the document
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if ( range.end < doc.data.length ) {
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tx.pushRetain( doc.data.length - range.end - unwrapOuter.length );
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}
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return tx;
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};
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/* Methods */
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/**
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* Checks if transaction would make any actual changes if processed.
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*
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* There may be more sophisticated checks that can be done, like looking for things being replaced
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* with identical content, but such transactions probably should not be created in the first place.
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*
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* @method
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* @returns {Boolean} Transaction is no-op
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*/
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ve.dm.Transaction.prototype.isNoOp = function () {
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return (
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this.operations.length === 0 ||
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( this.operations.length === 1 && this.operations[0].type === 'retain' )
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);
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};
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/**
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* Gets a list of all operations.
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*
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* @method
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* @returns {Object[]} List of operations
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*/
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ve.dm.Transaction.prototype.getOperations = function () {
|
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return this.operations;
|
|
};
|
|
|
|
/**
|
|
* Gets the difference in content length this transaction will cause if applied.
|
|
*
|
|
* @method
|
|
* @returns {Number} Difference in content length
|
|
*/
|
|
ve.dm.Transaction.prototype.getLengthDifference = function () {
|
|
return this.lengthDifference;
|
|
};
|
|
|
|
/**
|
|
* 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, cursor = 0, adjustment = 0, op, insertLength, removeLength;
|
|
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;
|
|
adjustment += insertLength - removeLength;
|
|
if ( offset === cursor + removeLength ) {
|
|
// Offset points to right after the removal, translate it
|
|
return offset + adjustment;
|
|
} else if ( offset >= cursor && offset < cursor + removeLength ) {
|
|
// The offset points inside of 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 ) );
|
|
};
|
|
|
|
/**
|
|
* Adds a retain operation.
|
|
*
|
|
* @method
|
|
* @param {Number} length Length of content data to retain
|
|
* @throws 'Invalid retain length, can not retain backwards: {length}'
|
|
*/
|
|
ve.dm.Transaction.prototype.pushRetain = function ( length ) {
|
|
if ( length < 0 ) {
|
|
throw new Error( 'Invalid retain length, can not 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
|
|
} );
|
|
}
|
|
}
|
|
};
|
|
|
|
/**
|
|
* Adds 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;
|
|
};
|
|
|
|
/**
|
|
* Adds 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
|
|
} );
|
|
};
|
|
|
|
/**
|
|
* Adds 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
|
|
} );
|
|
};
|
|
|
|
/**
|
|
* Adds 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
|
|
} );
|
|
};
|