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* VisualEditor DataModel TreeModifier class.
*
* @copyright See AUTHORS.txt
*/
/**
* DataModel tree modifier, following the algorithm in T162762.
*
* The top-level process() method applies a transaction to the document in two stages. First,
* calculateTreeOperations() translates the linear transaction into tree operations; then,
* applyTreeOperations() updates both the linear model and the document tree simultaneously.
*
* Each tree operation takes one of the following forms:
*
* { type: 'insertNode', isContent: {boolean}, at: {Path}, element: {OpenElementLinModItem} }
* { type: 'removeNode', isContent: {boolean}, at: {Path}, element: {OpenElementLinModItem} }
* { type: 'moveNode', isContent: {boolean}, from: {Path}, to: {Path} }
* { type: 'insertText', isContent: true, at: {Path}, data: {TextLinModItem[]} }
* { type: 'removeText', isContent: true, at: {Path}, data: {TextLinModItem[]} }
* { type: 'moveText', isContent: true, from: {Path}, to: {Path}, length: {number} }
*
* Note that moveNode/moveText do not specify what content is being moved, and all the Node
* operations always operate on a single node at a time.
*
* {Path} is number[] representing the tree path from the DocumentNode to the position, except
* that within ContentBranchNodes, the offset is the linearized offset of the position.
*
* {OpenElementLinModItem} is the linear model value representing the node being inserted or
* removed, like { type: 'paragraph' } .
*
* {TextLinModItem[]} is the linear model values representing the text, like
* [ 'y', 'o', 'u', ' ', [ 'm', [ 'he4e7c54e2204d10b ] ], [ 'e' 'he4e7c54e2204d10b ] ] .
*
* The isContent flag is true if the operation is taking place inside a ContentBranchNode
* (so it is always true for text).
*
* NOTE: Instances of this class are not recyclable: you can only call .process( tx ) on them once.
*
* @class
* @constructor
*/
ve.dm.TreeModifier = function VeDmTreeModifier() {
// XXX we only need these two for dump() in tests
this.document = null;
this.insertions = null;
/**
* @property {Array} data Live document linear data
*/
this.data = null;
/**
* @property {ve.dm.Node[]} deletions Array (acting as set) of removed nodes
*/
this.deletions = null;
/**
* @property {ve.dm.TreeCursor} remover Tree cursor for removals
*/
this.remover = null;
/**
* @property {ve.dm.TreeCursor} inserter Tree cursor for insertions
*/
this.inserter = null;
/**
* @property {Object[]} treeOps Array of tree ops being built
*/
this.treeOps = null;
/**
* @property {number[]} insertedNodes Nodes to be inserted at context
*/
this.insertedNodes = null;
/**
* @property {number[]} insertedPositions Position within nodes to be inserted
*/
this.insertedPositions = null;
/**
* @property {Object} adjustmentTree Sparse tree, paths as indexes
* @property {number} adjustmentTree.inserted Child items inserted at this position
* @property {number} adjustmentTree.removed Child items removed at this position
* @property {Object} adjustmentTree.i Subtree at position i
*/
this.adjustmentTree = null;
};
OO.initClass( ve.dm.TreeModifier );
// Static methods
/**
* Apply tree operations to document tree and linear data simultaneously
*
* @param {boolean} isReversed Whether the transaction is an undo
* @param {ve.dm.Document} document The document to modify
* @param {Object[]} treeOps The tree operations
*/
ve.dm.TreeModifier.static.applyTreeOperations = function ( isReversed, document, treeOps ) {
for ( var i = 0, iLen = treeOps.length; i < iLen; i++ ) {
this.applyTreeOperation( isReversed, document, treeOps[ i ] );
}
};
/**
* Throw an exception if two pieces of linear data are not equal
*
* @param {Array} actual Document linear data to test
* @param {Array} expected Expected linear data to test against
*/
ve.dm.TreeModifier.static.checkEqualData = function ( actual, expected ) {
function replacer( name, value ) {
// TODO: replace this check with data equality class method checks
if (
name === 'generated' ||
name === 'changesSinceLoad' ||
name === 'originalDomElementsHash' ||
name === 'originalMw' ||
name === 'originalVariantInfo' ||
name === 'mw' ||
name === 'contentsUsed'
) {
return undefined;
}
// Drop .internal that would become empty after the replacements above
if ( name === 'internal' && JSON.stringify( value, replacer ) === '{}' ) {
return undefined;
}
return value;
}
var jActual = JSON.stringify( actual, replacer );
var jExpected = JSON.stringify( expected, replacer );
Iif ( jActual !== jExpected ) {
throw new Error( 'Expected ' + jExpected + ' but got ' + jActual );
}
};
/**
* Apply a tree operation to document tree and linear data simultaneously
*
* @param {boolean} isReversed Whether the transaction is an undo
* @param {ve.dm.Document} document The document to modify
* @param {Object} treeOp The tree operation
*/
ve.dm.TreeModifier.static.applyTreeOperation = function ( isReversed, document, treeOp ) {
var removedNodes = [],
addedNodes = [],
changedBranchNodes = [];
function splice( parentNode ) {
var removed = parentNode.splice.apply( parentNode, Array.prototype.slice.call( arguments, 1 ) );
ve.batchPush( removedNodes, removed );
ve.batchPush( addedNodes, Array.prototype.slice.call( arguments, 3 ) );
return removed;
}
function ensureText( position ) {
var pre, post, newNode,
node = position.node,
offset = position.offset;
if ( node.type === 'text' ) {
return position;
}
pre = node.children[ offset - 1 ];
post = node.children[ offset ];
if ( post && post.type === 'text' ) {
// Prefer post to pre, because we might want to remove text. (We shouldn't
// really have two adjacent text nodes, though)
return { node: post, offset: 0 };
}
if ( pre && pre.type === 'text' ) {
return { node: pre, offset: pre.length };
}
// There are no adjacent text nodes; insert one
Iif ( !node.hasChildren() ) {
throw new Error( 'Cannot add a child to ' + node.type + ' node' );
}
newNode = new ve.dm.TextNode( 0 );
splice( node, offset, 0, newNode );
return { node: newNode, offset: 0 };
}
function ensureNotText( position ) {
var parentNode, parentOffset, length, newNode,
node = position.node,
offset = position.offset;
if ( node.type !== 'text' ) {
return position;
}
parentNode = node.parent;
parentOffset = node.parent.children.indexOf( node );
Iif ( offset === 0 ) {
// Position before the text node
return { node: parentNode, offset: parentOffset };
}
Iif ( offset === node.length ) {
return { node: parentNode, offset: parentOffset + 1 };
}
// Else we must split the text node
length = node.length - offset;
node.adjustLength( -length );
newNode = new ve.dm.TextNode( length );
splice( parentNode, parentOffset + 1, 0, newNode );
return { node: parentNode, offset: parentOffset + 1 };
}
function findContentPosition( node, contentOffset ) {
var i, offset, childLength, child;
if ( contentOffset === 0 ) {
return { node: node, offset: 0 };
}
// Find the child that will take us up to or past the contentOffset
offset = 0;
for ( i = 0; ; i++ ) {
child = node.children[ i ];
Iif ( !child ) {
throw new Error( 'Node does not reach offset' );
}
childLength = child.getOuterLength();
offset += childLength;
if ( offset >= contentOffset ) {
break;
}
}
if ( offset === contentOffset ) {
return { node: node, offset: i + 1 };
}
return { node: child, offset: contentOffset - offset + childLength };
}
function prepareSplice( pathAndOffset, isContent, wantText ) {
var i, iLen, position,
path = pathAndOffset.slice( 0, -1 ),
offset = pathAndOffset[ pathAndOffset.length - 1 ],
node = document.documentNode;
// Find node
for ( i = 0, iLen = path.length; i < iLen; i++ ) {
node = node.children[ path[ i ] ];
}
if ( isContent ) {
// Determine position from (linearized) content offset
if ( wantText ) {
position = ensureText( findContentPosition( node, offset ) );
} else {
position = ensureNotText( findContentPosition( node, offset ) );
}
} else {
position = { node: node, offset: offset };
}
// Get linear offset
if ( position.node.type === 'text' || position.offset === 0 ) {
position.linearOffset = position.node.getRange().start + position.offset;
} else {
position.linearOffset = position.node.children[ position.offset - 1 ].getOuterRange().end;
}
return position;
}
// Increment the change counter on the closest containing branch node at this offset
// (This is used when converting to/from HTML, to decide whether loaded metadata offsets
// need round tripping)
function markBranchNodeChanged( offset ) {
var item, newItem,
adj = isReversed ? -1 : 1,
i = offset - 1;
while ( i >= 0 ) {
item = document.data.getData( i-- );
if ( !(
ve.dm.LinearData.static.isOpenElementData( item ) &&
ve.dm.nodeFactory.lookup(
ve.dm.LinearData.static.getType( item )
).prototype instanceof ve.dm.BranchNode
) ) {
continue;
}
if ( item.internal && item.internal.changesSinceLoad !== undefined ) {
// Guard against marking the same node twice
Eif ( changedBranchNodes.indexOf( item ) === -1 ) {
newItem = ve.copy( item );
changedBranchNodes.push( newItem );
newItem.internal.changesSinceLoad += adj;
document.data.splice( i + 1, 1, ve.deepFreeze( newItem ) );
}
}
// This is a branch node boundary, so go no further
break;
}
}
function spliceLinear( offset, remove, insert ) {
var content = ve.batchSplice( document.data, offset, remove, insert ? ve.deepFreeze( insert, true ) : [] );
markBranchNodeChanged( offset );
return content;
}
// Removes empty text node, or joins consecutive text nodes, at offset
function healTextNodes( node, offset ) {
var pre = node.children[ offset - 1 ],
post = node.children[ offset ];
if ( post && post.type === 'text' && post.length === 0 ) {
// Remove empty text node
splice( node, offset, 1 );
post = node.children[ offset ];
}
if ( pre && post && pre.type === 'text' && post.type === 'text' ) {
pre.adjustLength( post.length );
splice( node, offset, 1 );
}
}
var isTextOp = treeOp.type.slice( -4 ) === 'Text';
var f = treeOp.from && prepareSplice( treeOp.from, treeOp.isContent, isTextOp );
var t = treeOp.to && prepareSplice( treeOp.to, treeOp.isContent, isTextOp );
// eslint-disable-next-line es-x/no-array-string-prototype-at
var a = treeOp.at && prepareSplice( treeOp.at, treeOp.isContent, isTextOp );
// Always adjust linear data before tree, to ensure consistency when node events
// are emitted.
var data;
var adjustment;
switch ( treeOp.type ) {
case 'removeNode':
// The node should have no contents, so its outer length should be 2
data = spliceLinear( a.linearOffset, 2 );
this.checkEqualData( data, [ treeOp.element, { type: '/' + treeOp.element.type } ] );
splice( a.node, a.offset, 1 );
healTextNodes( a.node, a.offset );
break;
case 'insertNode':
spliceLinear( a.linearOffset, 0, [ treeOp.element, { type: '/' + treeOp.element.type } ] );
var nodeToInsert = ve.dm.nodeFactory.createFromElement( treeOp.element );
if ( nodeToInsert instanceof ve.dm.BranchNode ) {
nodeToInsert.setupBlockSlugs();
}
splice( a.node, a.offset, 0, nodeToInsert );
break;
case 'moveNode':
data = spliceLinear( f.linearOffset, f.node.children[ f.offset ].getOuterLength() );
// No need to use local splice function as we know the node is going
// to be re-inserted immediately.
var movedNode = f.node.splice( f.offset, 1 )[ 0 ];
adjustment = t.linearOffset > f.linearOffset ? data.length : 0;
spliceLinear( t.linearOffset - adjustment, 0, data );
t.node.splice( t.offset, 0, movedNode );
break;
case 'removeText':
data = spliceLinear( a.linearOffset, treeOp.data.length );
this.checkEqualData( data, treeOp.data );
a.node.adjustLength( -treeOp.data.length );
healTextNodes( a.node.parent, a.node.parent.children.indexOf( a.node ) );
break;
case 'insertText':
spliceLinear( a.linearOffset, 0, treeOp.data );
a.node.adjustLength( treeOp.data.length );
break;
case 'moveText':
data = spliceLinear( f.linearOffset, treeOp.length );
f.node.adjustLength( -treeOp.length );
healTextNodes( f.node.parent, f.node.parent.children.indexOf( f.node ) );
adjustment = t.linearOffset > f.linearOffset ? data.length : 0;
spliceLinear( t.linearOffset - adjustment, 0, data );
t.node.adjustLength( treeOp.length );
break;
default:
throw new Error( 'Unknown tree op type: ' + treeOp.type );
}
if ( addedNodes.length || removedNodes.length ) {
document.updateNodesByType( addedNodes, removedNodes );
}
};
/**
* The top level method: modify document tree according to transaction
*
* @param {ve.dm.Document} document The document
* @param {ve.dm.Transaction} transaction The transaction
*/
ve.dm.TreeModifier.prototype.process = function ( document, transaction ) {
this.setup( document );
this.calculateTreeOperations( transaction );
// Prior rollback logic removed: treeOps is now guaranteed to work
this.constructor.static.applyTreeOperations( transaction.isReversed, document, this.treeOps );
};
/**
* Setup state variables
*
* @param {ve.dm.Document} document The document to be processed
*/
ve.dm.TreeModifier.prototype.setup = function ( document ) {
// XXX we only need these two properties for dump() in tests
this.document = document;
this.insertions = [];
// Initialize state
this.data = document.data;
this.deletions = [];
this.remover = new ve.dm.TreeCursor( document.getDocumentNode(), [] );
this.inserter = new ve.dm.TreeCursor( document.getDocumentNode(), this.deletions );
this.treeOps = [];
this.insertedNodes = [];
this.insertedPositions = [];
this.adjustmentTree = { offsetsUsed: [] };
};
/**
* Transform linear operations into tree operations
*
* @param {ve.dm.Transaction} transaction The transaction
*/
ve.dm.TreeModifier.prototype.calculateTreeOperations = function ( transaction ) {
var linearOps = transaction.operations;
for ( var i = 0, iLen = linearOps.length; i < iLen; i++ ) {
this.processLinearOperation( linearOps[ i ] );
}
this.processImplicitFinalRetain();
};
/**
* Translate a linear operation into tree operations
*
* #processImplicitFinalRetain should be called once all operations have been processed
*
* @param {Object} linearOp The linear operation
*/
ve.dm.TreeModifier.prototype.processLinearOperation = function ( linearOp ) {
if ( linearOp.type === 'retain' ) {
var retainLength = linearOp.length;
while ( retainLength > 0 ) {
retainLength -= this.processRetain( retainLength );
}
} else if ( linearOp.type === 'replace' ) {
var i, iLen, item, data;
for ( i = 0, iLen = linearOp.remove.length; i < iLen; i++ ) {
item = linearOp.remove[ i ];
if ( item.type ) {
this.processRemove( item );
continue;
}
// Group the whole current run of text, and process it
data = [ item ];
while ( ++i < iLen && !linearOp.remove[ i ].type ) {
item = linearOp.remove[ i ];
data.push( item );
}
i--;
this.processRemove( data );
}
for ( i = 0, iLen = linearOp.insert.length; i < iLen; i++ ) {
item = linearOp.insert[ i ];
if ( item.type ) {
this.processInsert( item );
continue;
}
// Group the whole current run of text, and process it
data = [ item ];
while ( ++i < iLen && !linearOp.insert[ i ].type ) {
item = linearOp.insert[ i ];
data.push( item );
}
i--;
this.processInsert( data );
}
}
// Else the linear operation type must be 'attribute': do nothing
};
/**
* Retain to the end of the content
*/
ve.dm.TreeModifier.prototype.processImplicitFinalRetain = function () {
// Pretend there is an implicit retain to the end of the document
// TODO: fix our tests so this is unnecessary, then check for exhaustion instead
while ( true ) {
var node = this.remover.node;
if ( !node || (
node === this.remover.root &&
this.remover.offset === node.children.length
) ) {
return;
}
var retainLength;
if ( node.type === 'text' ) {
// Retain all remaining text; if there is no remaining text then
// retain a single offset.
retainLength = Math.max( 1, node.length - this.remover.offset );
} else Iif ( !node.hasChildren() ) {
retainLength = 1;
} else {
var item = node.children[ this.remover.offset ];
retainLength = item ? item.getOuterLength() : 1;
}
this.processRetain( retainLength );
}
};
/**
* Test whether both pointers point to the same location
*
* @return {boolean} True if the paths and offsets are identical
*/
ve.dm.TreeModifier.prototype.cursorsMatch = function () {
if ( this.insertedPositions.length > 0 ) {
return false;
}
var rawRemoverPosition = this.getRawRemoverPosition( {
path: this.remover.path,
offset: this.remover.offset,
node: this.remover.node
} );
var rawInserterPosition = this.getRawInserterPosition();
var adjustedRemoverPosition = this.adjustRemoverPosition( rawRemoverPosition );
var adjustedInserterPosition = this.adjustInserterPosition( rawInserterPosition );
// Optimization: adjustedRemoverPosition and adjustedInserterPosition are very
// often arrays of length 1. This simple check is much faster than a full
// JSON.stringify comparison.
if (
adjustedRemoverPosition.length === 1 && adjustedInserterPosition.length === 1 &&
adjustedRemoverPosition[ 0 ] === adjustedInserterPosition[ 0 ]
) {
return true;
}
return JSON.stringify( adjustedRemoverPosition ) === JSON.stringify( adjustedInserterPosition );
};
/**
* Process the retention of content passed by one step of the remover
*
* If the inserter and remover are at the same place, just skip content.
*
* Else the remover *feeds* the inserter:
* - The inserter plans insertions in the (imagined, hypothetical) document
* - But the only move it can make in the (immutable) real document is to step out of nodes
* - It cannot skip past nodes (other than skipping remaining siblings when stepping out)
* - If the remover steps into a node, the inserter creates a node of the same type
* - If the remover crosses content, it is moved to the inserter
* - If the remover steps out of a node, the inserter steps out of its node
*
* @param {number} maxLength The maximum amount of content to retain
* @return {number} The amount of content retained
*/
ve.dm.TreeModifier.prototype.processRetain = function ( maxLength ) {
var remover = this.remover,
inserter = this.inserter;
if ( this.insertedPositions.length === 0 ) {
this.inserter.crossIgnoredNodes();
}
var removerStep, inserterStep;
if ( this.cursorsMatch() ) {
// Pointers are in the same location, so advance them together.
// This is the only way both pointers can ever enter the same node;
// in any other case, a node entered at an 'open' tag by one pointer
// is marked as either as a deletion or a creation, so the other
// pointer will not follow.
removerStep = remover.stepAtMost( maxLength );
inserterStep = inserter.stepAtMost( maxLength );
Iif ( !removerStep ) {
throw new Error( 'Remover past end' );
}
Iif ( !inserterStep ) {
throw new Error( 'Inserter past end' );
}
Iif ( !this.cursorsMatch() ) {
throw new Error( 'Remover and inserter unexpectedly diverged' );
}
return removerStep.length;
}
// Else pointers are not in the same location (in fact they cannot lie in the
// same node)
removerStep = remover.stepAtMost( maxLength );
switch ( removerStep.type ) {
case 'crosstext':
this.pushMoveTextOp( removerStep );
if ( this.insertedPositions.length ) {
this.insertedPositions[ this.insertedPositions.length - 1 ] += removerStep.length;
}
break;
case 'cross':
if ( removerStep.item.type === 'text' ) {
this.pushMoveTextOp( removerStep );
if ( this.insertedPositions.length ) {
this.insertedPositions[ this.insertedPositions.length - 1 ] += removerStep.item.length;
}
} else {
this.deletions.push( removerStep.item );
this.pushMoveNodeOp( removerStep );
if ( this.insertedPositions.length ) {
this.insertedPositions[ this.insertedPositions.length - 1 ] +=
this.isInsertionContent() ? 2 : 1;
}
}
break;
case 'open':
this.deletions.push( removerStep.item );
// Clone last open and step in
var element = removerStep.item.getClonedElement( true );
this.pushInsertNodeOp( element );
this.insertedNodes.push( element );
// This 0 position is invalid if element is content (because the offset should be
// linearized), but it will get popped immediately
this.insertedPositions.push( 0 );
break;
case 'close':
if ( this.insertedPositions.length ) {
this.insertedNodes.pop();
this.insertedPositions.pop();
if ( this.insertedPositions.length ) {
this.insertedPositions[ this.insertedPositions.length - 1 ] +=
this.isInsertionContent() ? 2 : 1;
}
} else {
if ( inserter.node.type === 'text' ) {
inserter.stepOut();
}
inserterStep = inserter.stepOut();
Iif ( inserterStep.item.type !== removerStep.item.type ) {
throw new Error( 'Expected ' + removerStep.item.type + ', not ' +
inserterStep.item.type );
}
}
this.pushRemoveLastIfInDeletions();
break;
}
return removerStep.length;
};
/**
* Process the removal of some items
*
* @param {Object|Array} itemOrData An open tag, a close tag, or an array of text items
*/
ve.dm.TreeModifier.prototype.processRemove = function ( itemOrData ) {
var cursorsMatch = this.cursorsMatch(),
length = itemOrData.length || 1,
step = this.remover.stepAtMost( length );
if ( cursorsMatch && ( step.type === 'cross' || step.type === 'crosstext' ) ) {
this.inserter.stepAtMost( length );
}
if ( step.type === 'crosstext' ) {
this.pushRemoveTextOp( step );
} else if ( step.type === 'cross' ) {
this.pushRemoveLast();
} else if ( step.type === 'open' ) {
this.deletions.push( step.item );
} else Eif ( step.type === 'close' ) {
this.pushRemoveLastIfInDeletions();
}
};
/**
* Process the insertion an open tag, a close tag, or an array of text items
*
* @param {Object|Array} itemOrData An open tag, a close tag, or an array of text items
*/
ve.dm.TreeModifier.prototype.processInsert = function ( itemOrData ) {
var inserter = this.inserter;
var item, type, data;
if ( itemOrData.type ) {
item = itemOrData;
type = item.type.charAt( 0 ) === '/' ? 'close' : 'open';
} else {
data = itemOrData;
type = 'crosstext';
}
if ( type === 'open' ) {
if ( inserter.node.type === 'text' ) {
// Step past the end of the text node, even if that skips past some
// content (in which case the remover logically must later cross that
// content in either processRemove or processRetain).
inserter.stepOut();
}
var element = ve.copy( item );
this.pushInsertNodeOp( element );
this.insertedNodes.push( element );
// This 0 position is invalid if element is content (because the offset should be
// linearized), but it will get popped immediately
this.insertedPositions.push( 0 );
} else if ( type === 'crosstext' ) {
this.pushInsertTextOp( ve.copy( data ) );
if ( this.insertedPositions.length ) {
this.insertedPositions[ this.insertedPositions.length - 1 ] += data.length;
}
} else Eif ( type === 'close' ) {
if ( this.insertedPositions.length ) {
var insertedNode = this.insertedNodes.pop();
if ( insertedNode.type !== item.type.slice( 1 ) ) {
throw new Error( 'Expected closing for ' + insertedNode.type +
' but got closing for ' + item.type.slice( 1 ) );
}
this.insertedPositions.pop();
if ( this.insertedPositions.length ) {
this.insertedPositions[ this.insertedPositions.length - 1 ] +=
this.isInsertionContent() ? 2 : 1;
}
} else {
// Step past the next close tag, even if that skips past some content (in which
// case the remover logically must later cross that content in either
// processRemove or processRetain).
if ( inserter.node.type === 'text' ) {
inserter.stepOut();
}
var step = inserter.stepOut();
if ( step.item.type !== item.type.slice( 1 ) ) {
throw new Error( 'Expected closing for ' + step.item.type +
' but got closing for ' + item.type.slice( 1 ) );
}
}
}
};
/**
* Push into treeOps the removal of the last remover step, which must be 'cross' or 'close'
*/
ve.dm.TreeModifier.prototype.pushRemoveLast = function () {
var step = this.remover.lastStep;
if ( step.item.type === 'text' ) {
this.pushRemoveTextOp( step );
} else {
this.pushRemoveNodeOp( step );
}
};
/**
* Push into treeOps the removal of the last remover step, if that item marked as deleted
*/
ve.dm.TreeModifier.prototype.pushRemoveLastIfInDeletions = function () {
var i = this.deletions.indexOf( this.remover.lastStep.item );
if ( i !== -1 ) {
this.pushRemoveLast();
}
};
/**
* Push into treeOps the node insertion at the current inserter position
*
* @param {ve.dm.Node} element The element to insert (inserted into treeOps without copying)
*/
ve.dm.TreeModifier.prototype.pushInsertNodeOp = function ( element ) {
var isContent = this.isInsertionContent(),
rawInserterPosition = this.getRawInserterPosition();
this.checkCanInsertNodeType( element.type );
this.treeOps.push( {
type: 'insertNode',
isContent: isContent,
at: this.adjustInserterPosition( rawInserterPosition ),
element: element
} );
if ( this.insertedPositions.length === 0 ) {
this.modifyAdjustmentTree( rawInserterPosition, isContent ? 2 : 1, false );
}
};
/**
* Push into treeOps the text insertion at the current inserter position
*
* @param {Array} data The text data to insert
*/
ve.dm.TreeModifier.prototype.pushInsertTextOp = function ( data ) {
var rawInserterPosition = this.getRawInserterPosition();
this.checkCanInsertText();
this.treeOps.push( {
type: 'insertText',
isContent: true,
at: this.adjustInserterPosition( rawInserterPosition ),
data: data
} );
if ( this.insertedPositions.length === 0 ) {
this.modifyAdjustmentTree( rawInserterPosition, data.length, false );
}
};
/**
* Push into treeOps a move of a node to the current inserter position
*
* @param {Object} removerStep The remover step over the node; see ve.dm.TreeCursor#stepAtMost
*/
ve.dm.TreeModifier.prototype.pushMoveNodeOp = function ( removerStep ) {
var rawRemoverPosition = this.getRawRemoverPosition( removerStep ),
rawInserterPosition = this.getRawInserterPosition(),
isContent = this.doesTypeTakeContent( removerStep.node.type );
this.checkCanInsertNodeType( removerStep.item.type );
this.treeOps.push( {
type: 'moveNode',
isContent: isContent,
from: this.adjustRemoverPosition( rawRemoverPosition ),
to: this.adjustInserterPosition( rawInserterPosition )
} );
this.modifyAdjustmentTree( rawRemoverPosition, isContent ? -2 : -1, true );
if ( this.insertedPositions.length === 0 ) {
this.modifyAdjustmentTree( rawInserterPosition, isContent ? 2 : 1, false );
}
};
/**
* Push into treeOps a move of some text to the current inserter position
*
* @param {Object} removerStep The remover step over the text; see ve.dm.TreeCursor#stepAtMost
*/
ve.dm.TreeModifier.prototype.pushMoveTextOp = function ( removerStep ) {
var length = removerStep.type === 'crosstext' ?
removerStep.length :
removerStep.item.getLength(),
rawRemoverPosition = this.getRawRemoverPosition( removerStep ),
rawInserterPosition = this.getRawInserterPosition();
this.checkCanInsertText();
this.treeOps.push( {
type: 'moveText',
isContent: true,
from: this.adjustRemoverPosition( rawRemoverPosition ),
to: this.adjustInserterPosition( rawInserterPosition ),
length: length
} );
this.modifyAdjustmentTree( rawRemoverPosition, -length, false );
if ( this.insertedPositions.length === 0 ) {
this.modifyAdjustmentTree( rawInserterPosition, length, false );
}
};
/**
* Push into treeOps a removal of a node
*
* @param {Object} removerStep The remover step over the node; see ve.dm.TreeCursor#stepAtMost
*/
ve.dm.TreeModifier.prototype.pushRemoveNodeOp = function ( removerStep ) {
var rawRemoverPosition = this.getRawRemoverPosition( removerStep ),
isContent = this.doesTypeTakeContent( removerStep.node.type );
this.treeOps.push( {
type: 'removeNode',
isContent: isContent,
at: this.adjustRemoverPosition( rawRemoverPosition ),
element: removerStep.item.getClonedElement( true )
} );
this.modifyAdjustmentTree( rawRemoverPosition, isContent ? -2 : -1, true );
};
/**
* Push into treeOps a removal of some text
*
* @param {Object} removerStep The remover step over the text; see ve.dm.TreeCursor#stepAtMost
*/
ve.dm.TreeModifier.prototype.pushRemoveTextOp = function ( removerStep ) {
var rawRemoverPosition = this.getRawRemoverPosition( removerStep );
var start, end;
if ( removerStep.type === 'crosstext' ) {
start = removerStep.node.getRange().start + removerStep.offset;
end = start + removerStep.length;
} else {
start = removerStep.item.getRange().start;
end = removerStep.item.getRange().end;
}
this.treeOps.push( {
type: 'removeText',
isContent: true,
at: this.adjustRemoverPosition( rawRemoverPosition ),
data: ve.copy( this.data.slice( start, end ) )
} );
this.modifyAdjustmentTree( rawRemoverPosition, start - end, false );
};
/**
* Return adjustment tree node at a given offset path, inserting it if necessary
*
* @param {number[]} position Offset path in the adjustment tree
* @return {Object} The adjustment tree node
*/
ve.dm.TreeModifier.prototype.findOrCreateAdjustmentNode = function ( position ) {
var adjustmentNode = this.adjustmentTree;
for ( var i = 0, len = position.length; i < len; i++ ) {
var offset = position[ i ];
if ( !adjustmentNode[ offset ] ) {
adjustmentNode[ offset ] = { offsetsUsed: [] };
adjustmentNode.offsetsUsed.push( offset );
}
adjustmentNode = adjustmentNode[ offset ];
}
return adjustmentNode;
};
/**
* Modify the adjustment in the adjustment tree at a given offset path
*
* @param {number[]} rawPosition Unadjusted offset path
* @param {number} diff Adjustment at rawPosition
* @param {boolean} deleteDescendants If true, delete all adjustments at paths descending from here
*/
ve.dm.TreeModifier.prototype.modifyAdjustmentTree = function ( rawPosition, diff, deleteDescendants ) {
var adjustmentNode = this.findOrCreateAdjustmentNode( rawPosition );
if ( diff > 0 ) {
adjustmentNode.inserted = ( adjustmentNode.inserted || 0 ) + diff;
} else {
adjustmentNode.removed = ( adjustmentNode.removed || 0 ) - diff;
}
if ( deleteDescendants ) {
adjustmentNode.offsetsUsed.forEach( function ( i ) {
delete adjustmentNode[ i ];
} );
adjustmentNode.offsetsUsed = [];
}
};
/**
* Get the raw position of a node stepped over by the remover
*
* @param {Object} step Remover step; see ve.dm.TreeCursor#stepAtMost
* @return {number[]} The pathAndOffset, with offsets inside a ContentBranchNode linearized
*/
ve.dm.TreeModifier.prototype.getRawRemoverPosition = function ( step ) {
return this.getRawPosition( step.path, step.offset, step.node );
};
/**
* Get the raw position at the inserter
*
* @return {number[]} The pathAndOffset, with offsets inside a ContentBranchNode linearized
*/
ve.dm.TreeModifier.prototype.getRawInserterPosition = function () {
return this.getRawPosition( this.inserter.path, this.inserter.offset, this.inserter.node );
};
/**
* Get the adjusted position of a raw remover position
*
* @param {number[]} rawPosition The raw remover position
* @return {number[]} Adjusted pathAndOffset, with offsets inside a ContentBranchNode linearized
*/
ve.dm.TreeModifier.prototype.adjustRemoverPosition = function ( rawPosition ) {
return this.getAdjustedPosition( rawPosition, false );
};
/**
* Get the adjusted position of a raw inserter position, XXX
*
* @param {number[]} rawPosition The raw inserter position (must be its current position)
* @return {number[]} Adjusted pathAndOffset, with offsets inside a ContentBranchNode linearized, and including current position within nodes to be inserted, if any
*/
ve.dm.TreeModifier.prototype.adjustInserterPosition = function ( rawPosition ) {
// getAdjustedPosition returns a brand new array, so we can safely modify
// it with batchPush, which is much faster than concat (which creates a new array)
var positions = this.getAdjustedPosition( rawPosition, true );
ve.batchPush( positions, this.insertedPositions );
return positions;
};
/**
* Get the raw position of a node, with offsets inside a ContentBranchNode linearized
*
* @param {number[]} path Path to a node
* @param {number} offset Offset within the node
* @param {ve.dm.Node} node The node
* @return {number[]} The pathAndOffset, with offsets inside a ContentBranchNode linearized
*/
ve.dm.TreeModifier.prototype.getRawPosition = function ( path, offset, node ) {
var i, linearizedOffset;
// No need to check node.parent.hasChildren() below as node.parent
// is a parent so must have children.
if ( node.parent && node.parent.canContainContent() ) {
var numNodesBefore = path[ path.length - 1 ];
linearizedOffset = offset;
for ( i = 0; i < numNodesBefore; i++ ) {
linearizedOffset += node.parent.children[ i ].getOuterLength();
}
path = path.slice( 0, -1 );
} else if ( node.canContainContent() && node.hasChildren() ) {
linearizedOffset = 0;
for ( i = 0; i < offset; i++ ) {
linearizedOffset += node.children[ i ].getOuterLength();
}
} else {
linearizedOffset = offset;
}
if ( !path.length ) {
// Optimization, path is often empty
return [ linearizedOffset ];
}
path = path.slice();
// slice+push is faster than concat
path.push( linearizedOffset );
return path;
};
/**
* Get the adjusted position of a raw position
*
* @param {number[]} position The raw position
* @param {boolean} isInserter True for an inserter position; false for a remover position
* @return {number[]} Adjusted pathAndOffset, with offsets inside a ContentBranchNode linearized
*/
ve.dm.TreeModifier.prototype.getAdjustedPosition = function ( position, isInserter ) {
var node = this.adjustmentTree;
position = position.slice();
// Adjust each offset in the path so inserted nodes are counted
for ( var i = 0, iLen = position.length; i < iLen; i++ ) {
var positionI = position[ i ];
// The loop below is equivalent to:
//
// for ( j = 0, jLen = positionI + 1; j < jLen; j++ ) {
// childNode = node[ j ];
// if ( !childNode ) {
// continue;
// }
// ...
// }
//
// However as `node` is very sparse, it is slow to iterate over
// every position, so just iterate over the positions we have,
// then check the loop conditions later. (T261634)
// An offsetsUsed property is stored on every node instead of
// using a for..in loop as a for..in loop has to re-calculate
// the list of indexes to iterate over.
var jLen = positionI + 1;
var offsetsUsed = node.offsetsUsed;
for ( var k = 0, kLen = offsetsUsed.length; k < kLen; k++ ) {
var j = offsetsUsed[ k ];
if ( j >= jLen ) {
continue;
}
var childNode = node[ j ];
var inserted = childNode.inserted || 0;
var removed = childNode.removed || 0;
if ( i < iLen - 1 || j < jLen - 1 ) {
// This offset is strictly before position
position[ i ] += inserted - removed;
} else {
// This offset is exactly at position
// Don't adjust for removals
position[ i ] += inserted;
// Adjust for insertions, except if we are the inserter and the insertion is incomplete
// (note if insertedNodes.length > 0, then also inserted > 0)
if ( isInserter && this.insertedNodes.length > 0 ) {
// Incomplete means we are inside a (non text) node
position[ i ]--;
}
}
}
node = node[ positionI ];
if ( !node ) {
break;
}
}
return position;
};
/**
* Test whether a node type takes content
*
* @param {string} type The name of a ve.dm.Node type
* @return {boolean} Whether that type takes content
*/
ve.dm.TreeModifier.prototype.doesTypeTakeContent = function ( type ) {
return !!ve.dm.nodeFactory.canNodeContainContent( type );
};
/**
* Test whether the inserter is at a content position
*
* @return {boolean} Whether the inserter is at a content position
*/
ve.dm.TreeModifier.prototype.isInsertionContent = function () {
return this.doesTypeTakeContent( this.getTypeAtInserter() );
};
/**
* Get the type of the node in which the inserter lies
*
* @return {string} The node type
*/
ve.dm.TreeModifier.prototype.getTypeAtInserter = function () {
return this.insertedNodes.length > 0 ?
this.insertedNodes[ this.insertedNodes.length - 1 ].type :
this.inserter.node.type;
};
/**
* Throw an error if the inserter is not in a content position
*
* @throws {Error} Cannot insert text into a foo node
*/
ve.dm.TreeModifier.prototype.checkCanInsertText = function () {
var parentType = this.getTypeAtInserter();
if ( parentType === 'text' ) {
return;
}
if ( !ve.dm.nodeFactory.canNodeContainContent( parentType ) ) {
throw new Error( 'Cannot insert text into a ' + parentType + ' node' );
}
};
/**
* Throw an error if the inserter node cannot take a child of a specified type
*
* @param {string} nodeType The node type
* @throws {Error} Cannot add child
*/
ve.dm.TreeModifier.prototype.checkCanInsertNodeType = function ( nodeType ) {
var parentType = this.getTypeAtInserter(),
nodeClass = ve.dm.nodeFactory.lookup( nodeType ),
parentClass = ve.dm.nodeFactory.lookup( parentType ),
childNodeTypes = parentClass.static.childNodeTypes;
if ( Array.isArray( childNodeTypes ) && childNodeTypes.length === 0 ) {
throw new Error( 'Cannot add a child to ' + parentType + ' node' );
}
if ( nodeClass.static.isContent && !parentClass.static.canContainContent ) {
throw new Error( 'Cannot add content node (' + nodeType + ') to a ' + parentType + ' node' );
}
if ( !nodeClass.static.isMetaData ) {
Iif ( !nodeClass.static.isContent && parentClass.static.canContainContent ) {
throw new Error( 'Cannot add structure node (' + nodeType + ') to a ' + parentType + ' node' );
}
Iif ( Array.isArray( childNodeTypes ) && childNodeTypes.indexOf( nodeType ) === -1 ) {
throw new Error( 'Cannot add a ' + nodeType + ' node to ' + parentType + ' node' );
}
}
};
/* Initialization */
ve.dm.treeModifier = new ve.dm.TreeModifier();
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