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7x 7x 7x 7x 4x | /*!
* VisualEditor DataModel Transaction builder class.
*
* @copyright See AUTHORS.txt
*/
/**
* Transaction builder: build transactions based on current ve.dm.Document state
*
* @class
* @constructor
*/
ve.dm.TransactionBuilder = function VeDmTransactionBuilder() {
// TODO: rewrite to store the current ve.dm.Document as a property
this.transaction = new ve.dm.Transaction();
};
/* Inheritance */
OO.initClass( ve.dm.TransactionBuilder );
/* Static Methods */
/**
* Generate a transaction that replaces data in a range.
*
* @param {ve.dm.Document} doc Document in pre-transaction state
* @param {ve.Range} range Range of data to remove
* @param {Array} data Data to insert
* @param {boolean} [removeMetadata=false] Remove metadata instead of collapsing it
* @return {ve.dm.Transaction} Transaction that replaces data
* @throws {Error} Invalid range
*/
ve.dm.TransactionBuilder.static.newFromReplacement = function ( doc, range, data, removeMetadata ) {
var txBuilder = new ve.dm.TransactionBuilder();
var endOffset = txBuilder.pushRemoval( doc, 0, range, removeMetadata );
endOffset = txBuilder.pushInsertion( doc, endOffset, endOffset, data );
txBuilder.pushFinalRetain( doc, endOffset );
return txBuilder.getTransaction();
};
/**
* Generate a transaction that inserts data at an offset.
*
* @static
* @param {ve.dm.Document} doc Document in pre-transaction state
* @param {number} offset Offset to insert at
* @param {Array} data Data to insert
* @return {ve.dm.Transaction} Transaction that inserts data
*/
ve.dm.TransactionBuilder.static.newFromInsertion = function ( doc, offset, data ) {
var txBuilder = new ve.dm.TransactionBuilder(),
endOffset = txBuilder.pushInsertion( doc, 0, offset, data );
// Retain to end of document, if needed (for completeness)
txBuilder.pushFinalRetain( doc, endOffset );
return txBuilder.getTransaction();
};
/**
* Generate a transaction that removes data from a range.
*
* There are three possible results from a removal:
*
* - Remove content only
* - Occurs when the range starts and ends on elements of different type, depth or ancestry
* - Remove entire elements and their content
* - Occurs when the range spans across an entire element
* - Merge two elements by removing the end of one and the beginning of another
* - Occurs when the range starts and ends on elements of similar type, depth and ancestry
*
* This function uses the following logic to decide what to actually remove:
*
* 1. Elements are only removed if range being removed covers the entire element
* 2. Elements can only be merged if {@link ve.dm.Node#canBeMergedWith} returns true
* 3. Merges take place at the highest common ancestor
*
* @param {ve.dm.Document} doc Document in pre-transaction state
* @param {ve.Range} range Range of data to remove
* @param {boolean} [removeMetadata=false] Remove metadata instead of collapsing it
* @return {ve.dm.Transaction} Transaction that removes data
* @throws {Error} Invalid range
*/
ve.dm.TransactionBuilder.static.newFromRemoval = function ( doc, range, removeMetadata ) {
var txBuilder = new ve.dm.TransactionBuilder(),
endOffset = txBuilder.pushRemoval( doc, 0, range, removeMetadata );
// Ensure no transaction leaves the document in a completely empty state
if ( range.start === 0 && range.end >= doc.getDocumentRange().end ) {
endOffset = txBuilder.pushInsertion( doc, endOffset, endOffset, [
{ type: 'paragraph' },
{ type: '/paragraph' }
] );
}
// Retain to end of document, if needed (for completeness)
txBuilder.pushFinalRetain( doc, endOffset );
return txBuilder.getTransaction();
};
/**
* Build a transaction that inserts the contents of a document at a given offset.
*
* This is typically used to merge changes to a document slice back into the main document. If newDoc
* is a document slice of doc, it's assumed that there were no changes to doc's internal list since
* the slice, so any differences between internal items that doc and newDoc have in common will
* be resolved in newDoc's favor.
*
* @param {ve.dm.Document} doc Main document in the state to which the transaction start applies
* @param {number} offset Offset to insert at
* @param {ve.dm.Document} newDoc Document to insert
* @param {ve.Range} [newDocRange] Range from the new document to insert (defaults to entire document)
* @return {ve.dm.Transaction} Transaction that inserts the nodes and updates the internal list
*/
ve.dm.TransactionBuilder.static.newFromDocumentInsertion = function ( doc, offset, newDoc, newDocRange ) {
var listNode = doc.internalList.getListNode(),
listNodeRange = listNode.getRange(),
newListNode = newDoc.internalList.getListNode(),
newListNodeRange = newListNode.getRange(),
newListNodeOuterRange = newListNode.getOuterRange();
var data;
if ( newDocRange ) {
data = new ve.dm.ElementLinearData( doc.getStore(), newDoc.getData( newDocRange, true ) );
} else {
// Get the data, but skip over the internal list
data = new ve.dm.ElementLinearData( doc.getStore(),
newDoc.getData( new ve.Range( 0, newListNodeOuterRange.start ), true ).concat(
newDoc.getData( new ve.Range( newListNodeOuterRange.end, newDoc.data.getLength() ), true )
)
);
}
// Merge the stores
doc.getStore().merge( newDoc.getStore() );
var listMerge = doc.internalList.merge( newDoc.internalList, newDoc.origInternalListLength || 0 );
// Remap the indexes in the data
data.remapInternalListIndexes( listMerge.mapping, doc.internalList );
// Get data for the new internal list
var linearData, listData;
if ( newDoc.origInternalListLength !== null ) {
// newDoc is a document slice based on doc, so all the internal list items present in doc
// when it was cloned are also in newDoc. We need to get the newDoc version of these items
// so that changes made in newDoc are reflected.
var oldEndOffset, newEndOffset;
if ( newDoc.origInternalListLength > 0 ) {
oldEndOffset = doc.internalList.getItemNode( newDoc.origInternalListLength - 1 ).getOuterRange().end;
newEndOffset = newDoc.internalList.getItemNode( newDoc.origInternalListLength - 1 ).getOuterRange().end;
} else E{
oldEndOffset = listNodeRange.start;
newEndOffset = newListNodeRange.start;
}
linearData = new ve.dm.ElementLinearData(
doc.getStore(),
newDoc.getData( new ve.Range( newListNodeRange.start, newEndOffset ), true )
);
listData = linearData.data
.concat( doc.getData( new ve.Range( oldEndOffset, listNodeRange.end ), true ) );
} else {
// newDoc is brand new, so use doc's internal list as a base
listData = doc.getData( listNodeRange, true );
}
var i, len;
for ( i = 0, len = listMerge.newItemRanges.length; i < len; i++ ) {
linearData = new ve.dm.ElementLinearData(
doc.getStore(),
newDoc.getData( listMerge.newItemRanges[ i ], true )
);
listData = listData.concat( linearData.data );
}
var txBuilder = new ve.dm.TransactionBuilder();
var insertion;
if ( offset <= listNodeRange.start ) {
// offset is before listNodeRange
// First replace the node, then the internal list
// Fix up the node insertion
insertion = doc.fixupInsertion( data.data, offset );
txBuilder.pushRetain( insertion.offset );
txBuilder.pushReplacement( doc, insertion.offset, insertion.remove, insertion.data, true );
txBuilder.pushRetain( listNodeRange.start - ( insertion.offset + insertion.remove ) );
txBuilder.pushReplacement( doc, listNodeRange.start, listNodeRange.end - listNodeRange.start,
listData, true
);
txBuilder.pushFinalRetain( doc, listNodeRange.end );
} else if ( offset >= listNodeRange.end ) {
// offset is after listNodeRange
// First replace the internal list, then the node
// Fix up the node insertion
insertion = doc.fixupInsertion( data.data, offset );
txBuilder.pushRetain( listNodeRange.start );
txBuilder.pushReplacement( doc, listNodeRange.start, listNodeRange.end - listNodeRange.start,
listData, true
);
txBuilder.pushRetain( insertion.offset - listNodeRange.end );
txBuilder.pushReplacement( doc, insertion.offset, insertion.remove, insertion.data, true );
txBuilder.pushFinalRetain( doc, insertion.offset + insertion.remove );
} else Eif ( offset >= listNodeRange.start && offset <= listNodeRange.end ) {
// offset is within listNodeRange
// Merge data into listData, then only replace the internal list
// Find the internalItem we are inserting into
i = 0;
// Find item node in doc
var spliceItemRange;
while (
( spliceItemRange = doc.internalList.getItemNode( i ).getRange() ) &&
offset > spliceItemRange.end
) {
i++;
}
var spliceListNodeRange;
if ( newDoc.origInternalListLength !== null ) {
// Get spliceItemRange from newDoc
spliceItemRange = newDoc.internalList.getItemNode( i ).getRange();
spliceListNodeRange = newListNodeRange;
} else E{
// Get spliceItemRange from doc; the while loop has already set it
spliceListNodeRange = listNodeRange;
}
ve.batchSplice( listData, spliceItemRange.start - spliceListNodeRange.start,
spliceItemRange.end - spliceItemRange.start, data.data );
txBuilder.pushRetain( listNodeRange.start );
txBuilder.pushReplacement( doc, listNodeRange.start, listNodeRange.end - listNodeRange.start,
listData, true
);
txBuilder.pushFinalRetain( doc, listNodeRange.end );
}
return txBuilder.getTransaction();
};
/**
* Generate a transaction that changes one or more attributes.
*
* @static
* @param {ve.dm.Document} doc Document in pre-transaction state
* @param {number} offset Offset of element
* @param {Object.<string,Mixed>} attr List of attribute key and value pairs, use undefined value
* to remove an attribute
* @return {ve.dm.Transaction} Transaction that changes an element
* @throws {Error} Cannot set attributes to non-element data
* @throws {Error} Cannot set attributes on closing element
*/
ve.dm.TransactionBuilder.static.newFromAttributeChanges = function ( doc, offset, attr ) {
var txBuilder = new ve.dm.TransactionBuilder(),
data = doc.getData();
// Verify element exists at offset
if ( data[ offset ].type === undefined ) {
throw new Error( 'Cannot set attributes to non-element data' );
}
// Verify element is not a closing
if ( data[ offset ].type.charAt( 0 ) === '/' ) {
throw new Error( 'Cannot set attributes on closing element' );
}
// Retain up to element
txBuilder.pushRetain( offset );
// Change attributes
txBuilder.pushAttributeChanges( attr, data[ offset ].attributes || {} );
// Retain to end of document
txBuilder.pushFinalRetain( doc, offset );
return txBuilder.getTransaction();
};
/**
* Generate a transaction that annotates content.
*
* @static
* @param {ve.dm.Document} doc Document in pre-transaction state
* @param {ve.Range} range Range to annotate
* @param {string} method Annotation mode
* - `set`: Adds annotation to all content in range
* - `clear`: Removes instances of annotation from content in range
* @param {ve.dm.Annotation} annotation Annotation to set or clear
* @return {ve.dm.Transaction} Transaction that annotates content
*/
ve.dm.TransactionBuilder.static.newFromAnnotation = function ( doc, range, method, annotation ) {
var clear = method === 'clear',
run = null,
runs = [],
data = doc.data,
hash = doc.getStore().hash( annotation ),
insideContentNode = false,
ignoreChildrenDepth = 0;
var i;
/**
* Return the array index of the annotation in the annotation array for the offset
*
* @param {number} offset Document offset
* @return {number} Index in the annotation array (-1 if not present)
*/
function findAnnotation() {
return data.getAnnotationHashesFromOffset( i ).lastIndexOf( hash );
}
function startRun() {
run = {
start: i,
end: null,
data: null,
spliceAt: clear ? findAnnotation() : null
};
}
function endRun() {
run.end = i;
if ( !clear ) {
run.spliceAt = data.getCommonAnnotationArrayLength(
new ve.Range( run.start, i )
);
}
run.data = doc.getData( new ve.Range( run.start, run.end ) );
for ( var j = 0, jLen = run.data.length; j < jLen; j++ ) {
var item = ve.copy( run.data[ j ] );
var anns = new ve.dm.AnnotationSet(
doc.getStore(),
ve.dm.ElementLinearData.static.getAnnotationHashesFromItem( item )
);
if ( clear ) {
anns.remove( annotation );
} else {
anns.add( annotation, run.spliceAt );
}
item = ve.dm.ElementLinearData.static.replaceAnnotationHashesForItem( item, anns.getHashes() );
run.data[ j ] = item;
}
runs.push( run );
run = null;
}
var covered, arrayIndex;
// Iterate over all data in range, finding "runs" to annotate
for ( i = range.start; i < range.end; i++ ) {
if ( data.isElementData( i ) && ve.dm.nodeFactory.shouldIgnoreChildren( data.getType( i ) ) ) {
ignoreChildrenDepth += data.isOpenElementData( i ) ? 1 : -1;
}
var annotatable = !ignoreChildrenDepth && data.canTakeAnnotationAtOffset( i, annotation );
if (
!annotatable ||
( insideContentNode && !data.isCloseElementData( i ) )
) {
// Structural element opening or closing, or entering a content node
if ( run ) {
endRun();
}
continue;
}
if ( data.isCloseElementData( i ) ) {
// Content closing, skip
insideContentNode = false;
continue;
}
Iif ( insideContentNode ) {
continue;
}
// Else we're annotatable, not inside a content node, and have character or
// content element opening
if ( data.isElementData( i ) ) {
insideContentNode = true;
}
if ( !clear ) {
// Don't re-apply matching annotation
covered = data.getAnnotationsFromOffset( i ).containsComparable( annotation );
} else {
// Expect comparable annotations to be removed individually otherwise
// we might try to remove more than one annotation per character, which
// a single transaction can't do.
arrayIndex = findAnnotation();
}
if ( run && (
( clear && arrayIndex !== run.spliceAt ) ||
( !clear && covered )
) ) {
// Inside a run and:
// - if clearing, annotation is absent entirely or at a new array index
// - if setting, Matching annotation is present already
endRun();
}
if ( !run && (
( clear && arrayIndex > -1 ) ||
( !clear && !covered )
) ) {
// Not inside a run, and:
// - if clearing, annotation is present
// - if setting, annotation is not present
startRun();
}
}
if ( run ) {
endRun();
}
var txBuilder = new ve.dm.TransactionBuilder();
var iLen;
for ( i = 0, iLen = runs.length; i < iLen; i++ ) {
run = runs[ i ];
txBuilder.pushRetain( run.start - ( i > 0 ? runs[ i - 1 ].end : 0 ) );
txBuilder.pushReplacement( doc, run.start, run.end - run.start, run.data, false );
}
txBuilder.pushFinalRetain( doc, runs.length > 0 ? runs[ runs.length - 1 ].end : 0 );
return txBuilder.getTransaction();
};
/**
* Generate a transaction that converts elements that can contain content.
*
* @static
* @param {ve.dm.Document} doc Document in pre-transaction state
* @param {ve.Range} range Range to convert
* @param {string} type Symbolic name of element type to convert to
* @param {Object} [attr] Attributes to initialize element with
* @param {Object} [internal] Internal attributes to initialize element with
* @return {ve.dm.Transaction} Transaction that converts content branches
*/
ve.dm.TransactionBuilder.static.newFromContentBranchConversion = function ( doc, range, type, attr, internal ) {
var txBuilder = new ve.dm.TransactionBuilder(),
selection = doc.selectNodes( range, 'leaves' ),
opening = { type: type },
closing = { type: '/' + type },
previousBranch,
previousBranchOuterRange;
// Add attributes to opening if needed
if ( attr ) {
if ( !ve.isEmptyObject( attr ) ) {
opening.attributes = attr;
}
} else {
// Set to empty object for comparison
attr = {};
}
if ( internal ) {
if ( !ve.isEmptyObject( internal ) ) {
opening.internal = internal;
}
} else {
// Set to empty object for comparison
internal = {};
}
// Replace the wrappings of each content branch in the range
for ( var i = 0, len = selection.length; i < len; i++ ) {
var selected = selection[ i ];
// TODO: This duplicates the logic of ve.dm.SurfaceFragment#getSelectedLeafNodes
// This could perhaps be a new mode in ve.Document#selectNodes?
if ( !( len === 1 || !selected.range || !selected.range.isCollapsed() ) ) {
continue;
}
var branch = selected.node.isContent() ? selected.node.getParent() : selected.node;
Eif ( branch.canContainContent() ) {
// Skip branches that are already of the target type and have matching attributes
Iif (
branch.getType() === type &&
ve.compare( attr, branch.getAttributes() ) &&
ve.compare( internal, branch.element.internal || {} )
) {
continue;
}
var branchOuterRange = branch.getOuterRange();
// Don't convert the same branch twice
Iif ( branch === previousBranch ) {
continue;
}
// Retain up to this branch, considering where the previous one left off
txBuilder.pushRetain(
branchOuterRange.start - ( previousBranch ? previousBranchOuterRange.end : 0 )
);
if (
branch.getType() === type &&
ve.compare( internal, branch.element.internal || {} )
) {
// Same type and internal, different attributes, so we only need an attribute change
txBuilder.pushAttributeChanges( attr, branch.getAttributes() );
// Retain the branch, including its opening and closing
txBuilder.pushRetain( branch.getOuterLength() );
} else {
// Types or internal differ, so we need to replace the opening and closing
// Replace the opening
txBuilder.pushReplacement( doc, branchOuterRange.start, 1, [ ve.copy( opening ) ] );
// Retain the contents
txBuilder.pushRetain( branch.getLength() );
// Replace the closing
txBuilder.pushReplacement( doc, branchOuterRange.end - 1, 1, [ ve.copy( closing ) ] );
}
// Remember this branch and its range for next time
previousBranch = branch;
previousBranchOuterRange = branchOuterRange;
}
}
// Retain until the end
txBuilder.pushFinalRetain( doc, previousBranch ? previousBranchOuterRange.end : 0 );
return txBuilder.getTransaction();
};
/**
* Generate a transaction that wraps, unwraps or replaces structure.
*
* The unwrap parameters are checked against the actual model data, and
* an exception is thrown if the type fields don't match. This means you
* can omit attributes from the unwrap parameters, those are automatically
* picked up from the model data instead.
*
* NOTE: This function currently does not fix invalid parent/child relationships, so it will
* happily convert paragraphs to listItems without wrapping them in a list if that's what you
* ask it to do. We'll probably fix this later but for now the caller is responsible for giving
* valid instructions.
*
* Changing a paragraph to a header:
* Before: [ {type: 'paragraph'}, 'a', 'b', 'c', {type: '/paragraph'} ]
* newFromWrap( new ve.Range( 1, 4 ), [ {type: 'paragraph'} ], [ {type: 'heading', level: 1 } ] );
* After: [ {type: 'heading', level: 1 }, 'a', 'b', 'c', {type: '/heading'} ]
*
* Changing a set of paragraphs to a list:
* Before: [ {type: 'paragraph'}, 'a', {type: '/paragraph'}, {'type':'paragraph'}, 'b', {'type':'/paragraph'} ]
* newFromWrap( new ve.Range( 0, 6 ), [], [ {type: 'list' } ], [], [ {type: 'listItem', attributes: {styles: ['bullet']}} ] );
* After: [ {type: 'list'}, {type: 'listItem', attributes: {styles: ['bullet']}}, {'type':'paragraph'} 'a',
* {type: '/paragraph'}, {type: '/listItem'}, {type: 'listItem', attributes: {styles: ['bullet']}},
* {type: 'paragraph'}, 'b', {type: '/paragraph'}, {type: '/listItem'}, {type: '/list'} ]
*
* @param {ve.dm.Document} doc Document in pre-transaction state
* @param {ve.Range} range Range to wrap/unwrap/replace around
* @param {Array} unwrapOuter Opening elements to unwrap. These must be immediately *outside* the range
* @param {Array} wrapOuter Opening elements to wrap around the range
* @param {Array} unwrapEach Opening elements to unwrap from each top-level element in the range
* @param {Array} wrapEach Opening elements to wrap around each top-level element in the range
* @return {ve.dm.Transaction}
*/
ve.dm.TransactionBuilder.static.newFromWrap = function ( doc, range, unwrapOuter, wrapOuter, unwrapEach, wrapEach ) {
var txBuilder = new ve.dm.TransactionBuilder(),
depth = 0;
/**
* Match items before/after an offset, skipping over MetaItems
*
* @param {string} direction Direction of match, backwards|forwards
* @param {number} offset First boundary for the matching items
* @param {Object[]} matchList List of objects with .type properties to compare
* @param {string} matchName Description of the match, for error messages
* @return {number} Other slice boundary for the matching items
* @throws {Error} Unmatched item foo in matchName [(found bar)]
*/
function match( direction, offset, matchList, matchName ) {
var start, stop, step;
if ( direction === 'forwards' ) {
start = 0;
stop = matchList.length;
step = 1;
// Inclusive 'from' slice boundary
offset--;
} else {
start = matchList.length - 1;
stop = -1;
step = -1;
}
for ( var j = start; j !== stop; j += step ) {
var item;
// Move to next item, skipping MetaItems
while ( true ) {
offset += step;
item = doc.data.data[ offset ];
if ( !(
ve.dm.LinearData.static.isElementData( item ) &&
ve.dm.nodeFactory.isMetaData(
ve.dm.LinearData.static.getType( item )
)
) ) {
break;
}
}
if ( !item || item.type !== matchList[ j ].type ) {
throw new Error( 'Unmatched item ' + matchList[ j ].type + ' in ' +
matchName + ' (found ' + ( item && item.type ) + ')' );
}
}
if ( direction === 'forwards' ) {
// Exclusive 'to' slice boundary
offset++;
}
return offset;
}
// Function to generate arrays of closing elements in reverse order
function closingArray( openings ) {
var j, jlen,
closings = [];
for ( j = 0, jlen = openings.length; j < jlen; j++ ) {
closings[ closings.length ] = { type: '/' + openings[ jlen - j - 1 ].type };
}
return closings;
}
var closingUnwrapEach = closingArray( unwrapEach );
var closingWrapEach = closingArray( wrapEach );
// TODO: check for and fix nesting validity like fixupInsertion does
// Verify the data before range.start matches unwrapOuter, and find where to retain up to
var ptr = match( 'backwards', range.start, unwrapOuter, 'unwrapOuter' );
txBuilder.pushRetain( ptr );
// Replace wrapper (retaining any metadata)
txBuilder.pushReplacement( doc, ptr, range.start - ptr, ve.copy( wrapOuter ) );
ptr = range.start;
if ( wrapEach.length === 0 && unwrapEach.length === 0 ) {
// There is no wrapEach/unwrapEach to be done, just retain
// up to the end of the range
txBuilder.pushRetain( range.end - range.start );
ptr = range.end;
} else {
// 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
var startOffset;
for ( var i = range.start; i < range.end; i++ ) {
if ( !doc.data.isElementData( i ) ) {
continue;
}
if ( doc.data.isOpenElementData( i ) ) {
depth++;
if (
depth !== 1 ||
ve.dm.nodeFactory.isMetaData(
ve.dm.LinearData.static.getType(
doc.data.data[ i ]
)
)
) {
continue;
}
// Retain any outstanding top level items (which must be MetaItems)
txBuilder.pushRetain( i - ptr );
// This is the start of a top-level element
ptr = match( 'forwards', i, unwrapEach, 'unwrapEach' );
// Replace wrapper (retaining any metadata)
txBuilder.pushReplacement( doc, i, ptr - i, ve.copy( wrapEach ) );
startOffset = ptr;
continue;
}
// Else this is a closing element
depth--;
if (
depth !== 0 ||
ve.dm.nodeFactory.isMetaData(
ve.dm.LinearData.static.getType( doc.data.data[ i ] )
)
) {
continue;
}
// This is the end of a top-level element
ptr = match( 'backwards', i + 1, closingUnwrapEach, 'closingUnwrapEach' );
// ptr is the range end of the unwrapped data (i.e. the offset after it)
txBuilder.pushRetain( ptr - startOffset );
// Replace the closing elements (retaining any metadata)
txBuilder.pushReplacement( doc, ptr, i + 1 - ptr, ve.copy( closingWrapEach ) );
ptr = i + 1;
}
}
// Retain any outstanding top level items (which must be MetaItems)
txBuilder.pushRetain( range.end - ptr );
ptr = match( 'forwards', range.end, closingArray( unwrapOuter ), 'unwrapOuter' );
txBuilder.pushReplacement( doc, range.end, ptr - range.end, closingArray( wrapOuter ) );
// Retain up to the end of the document
txBuilder.pushFinalRetain( doc, ptr );
return txBuilder.getTransaction();
};
/* Methods */
/**
* Get the transaction
*
* @return {ve.dm.Transaction} The transaction
*/
ve.dm.TransactionBuilder.prototype.getTransaction = function () {
return this.transaction;
};
/**
* Add a final retain operation to finish off a transaction (internal helper).
*
* @private
* @param {ve.dm.Document} doc The document in the state to which the transaction applies
* @param {number} offset Final offset edited by the transaction up to this point.
*/
ve.dm.TransactionBuilder.prototype.pushFinalRetain = function ( doc, offset ) {
if ( offset < doc.data.getLength() ) {
this.pushRetain( doc.data.getLength() - offset );
}
};
/**
* Add a retain operation.
*
* @param {number} length Length of content data to retain
* @throws {Error} Cannot retain backwards
*/
ve.dm.TransactionBuilder.prototype.pushRetain = function ( length ) {
Iif ( length < 0 ) {
throw new Error( 'Invalid retain length, cannot retain backwards:' + length );
}
if ( length ) {
var end = this.transaction.operations.length - 1;
if (
this.transaction.operations.length &&
this.transaction.operations[ end ].type === 'retain'
) {
this.transaction.operations[ end ].length += length;
} else {
this.transaction.pushRetainOp( length );
}
}
};
/**
* Adds a replace op to remove the desired range and, where required, splices in retain ops
* to prevent the deletion of undeletable nodes.
*
* @param {ve.dm.Document} doc The document in the state to which the transaction applies
* @param {number} removeStart Offset to start removing from
* @param {number} removeEnd Offset to remove to
* @param {boolean} [removeMetadata=false] Remove metadata instead of collapsing it
* @return {number} End offset of the removal
*/
ve.dm.TransactionBuilder.prototype.addSafeRemoveOps = function ( doc, removeStart, removeEnd, removeMetadata ) {
var retainStart = removeStart,
undeletableStackDepth = 0;
// Iterate over removal range and use a stack counter to determine if
// we are inside an undeletable node
var queuedRetain;
for ( var i = removeStart; i < removeEnd; i++ ) {
if ( doc.data.isElementData( i ) && !ve.dm.nodeFactory.isNodeDeletable( doc.data.getType( i ) ) ) {
if ( !doc.data.isCloseElementData( i ) ) {
if ( undeletableStackDepth === 0 ) {
Iif ( queuedRetain ) {
this.pushRetain( queuedRetain );
}
this.pushReplacement( doc, removeStart, i - removeStart, [], removeMetadata );
retainStart = i;
}
undeletableStackDepth++;
} else {
undeletableStackDepth--;
if ( undeletableStackDepth === 0 ) {
queuedRetain = i + 1 - retainStart;
removeStart = i + 1;
}
}
}
}
if ( removeEnd - removeStart ) {
if ( queuedRetain ) {
this.pushRetain( queuedRetain );
}
this.pushReplacement( doc, removeStart, removeEnd - removeStart, [], removeMetadata );
retainStart = removeEnd;
}
return retainStart;
};
/**
* Add a replace operation (internal helper).
*
* @private
* @param {Array} remove Data removed.
* @param {Array} insert Data to insert.
* @param {number} [insertedDataOffset] Inserted data offset
* @param {number} [insertedDataLength] Inserted data length
*/
ve.dm.TransactionBuilder.prototype.pushReplaceInternal = function ( remove, insert, insertedDataOffset, insertedDataLength ) {
if ( remove.length === 0 && insert.length === 0 ) {
return; // No-op
}
this.transaction.pushReplaceOp( remove, insert, insertedDataOffset, insertedDataLength );
};
/**
* Add a replace operation
*
* If metadata is collapsed instead of removed, it will be shifted backwards if necessary to
* reach a legal position for metadata in the new document structure.
*
* @param {ve.dm.Document} doc The document in the state to which the transaction applies
* @param {number} offset Offset to start at
* @param {number} removeLength Number of data items to remove
* @param {Array} insert Data to insert
* @param {boolean} removeMetadata Remove metadata instead of collapsing it
* @param {number} [insertedDataOffset] Offset of the originally inserted data in the resulting operation data
* @param {number} [insertedDataLength] Length of the originally inserted data in the resulting operation data
*/
ve.dm.TransactionBuilder.prototype.pushReplacement = function ( doc, offset, removeLength, insert, removeMetadata, insertedDataOffset, insertedDataLength ) {
var remove = doc.getData( new ve.Range( offset, offset + removeLength ) );
var collapse = removeMetadata ? [] : remove.filter( function ( item ) {
var type = ve.dm.LinearData.static.isElementData( item ) &&
ve.dm.LinearData.static.getType( item );
return type &&
ve.dm.nodeFactory.isMetaData( type ) &&
!ve.dm.nodeFactory.isRemovableMetaData( type );
} );
if ( removeLength === collapse.length && insert.length === 0 ) {
// Don't push no-ops
return;
}
if ( collapse.length > 0 ) {
// Push collapsed metadata, moved backwards if this position has become invalid
// for metadata
this.pushMeta( doc, offset, collapse );
}
// Merge with previous replace, if any (which may have come from the pushMeta above)
var lastOp = this.transaction.operations[ this.transaction.operations.length - 1 ];
if (
lastOp &&
lastOp.type === 'replace' &&
!lastOp.insertedDataOffset &&
!insertedDataOffset
) {
this.transaction.operations.pop();
remove = lastOp.remove.concat( remove );
insert = lastOp.insert.concat( insert );
}
var op = {
type: 'replace',
remove: remove,
insert: insert
};
if ( insertedDataOffset !== undefined ) {
op.insertedDataOffset = insertedDataOffset;
}
if ( insertedDataLength !== undefined ) {
op.insertedDataLength = insertedDataLength;
}
this.transaction.operations.push( op );
};
/**
* Add an element attribute change operation.
*
* @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.TransactionBuilder.prototype.pushReplaceElementAttribute = function ( key, from, to ) {
this.transaction.pushAttributeOp( key, from, to );
};
/**
* Add a series of element attribute change operations.
*
* @param {Object} changes Object mapping attribute names to new values
* @param {Object} oldAttrs Object mapping attribute names to old values
*/
ve.dm.TransactionBuilder.prototype.pushAttributeChanges = function ( changes, oldAttrs ) {
for ( var key in changes ) {
if ( oldAttrs[ key ] !== changes[ key ] ) {
this.pushReplaceElementAttribute( key,
ve.copy( oldAttrs[ key ] ),
ve.copy( changes[ key ] )
);
}
}
};
/**
* Internal helper method for newFromInsertion and newFromReplacement.
* Adds an insertion to an existing transaction object.
*
* @private
* @param {ve.dm.Document} doc The document in the state to which the transaction applies
* @param {number} currentOffset Offset up to which the transaction has gone already
* @param {number} insertOffset Offset to insert at
* @param {Array} data Linear model data to insert
* @return {number} End offset of the insertion
*/
ve.dm.TransactionBuilder.prototype.pushInsertion = function ( doc, currentOffset, insertOffset, data ) {
// Fix up the insertion
var insertion = doc.fixupInsertion( data, insertOffset );
// Retain up to insertion point, if needed
this.pushRetain( insertion.offset - currentOffset );
// Insert data
this.pushReplacement(
doc, insertion.offset, insertion.remove, insertion.data, false,
insertion.insertedDataOffset, insertion.insertedDataLength
);
return insertion.offset + insertion.remove;
};
/**
* Internal helper method for newFromRemoval and newFromReplacement.
* Adds a removal to an existing transaction object.
*
* @private
* @param {ve.dm.Document} doc The document in the state to which the transaction applies
* @param {number} currentOffset Offset up to which the transaction has gone already
* @param {ve.Range} range Range to remove
* @param {boolean} [removeMetadata=false] Remove metadata instead of collapsing it
* @return {number} End offset of the removal
*/
ve.dm.TransactionBuilder.prototype.pushRemoval = function ( doc, currentOffset, range, removeMetadata ) {
var offset = currentOffset,
removeStart = null,
removeEnd = null;
// Validate range
if ( range.isCollapsed() ) {
// Empty range, nothing to remove
this.pushRetain( range.start - currentOffset );
return range.start;
}
// Select nodes and validate selection
var selection = doc.selectNodes( range, 'covered' );
Iif ( selection.length === 0 ) {
// Empty selection? Something is wrong!
throw new Error( 'Invalid range, cannot remove from ' + range.start + ' to ' + range.end );
}
var first = selection[ 0 ];
var last = selection[ selection.length - 1 ];
// If the first and last node are mergeable, merge them
if ( first.node.canBeMergedWith( last.node ) ) {
if ( !first.range && !last.range ) {
// First and last node are both completely covered, remove them
removeStart = first.nodeOuterRange.start;
removeEnd = last.nodeOuterRange.end;
} else {
// Either the first node or the last node is partially covered, so remove
// the selected content. The other node might be fully covered, in which case
// we remove its contents (nodeRange). For fully covered content nodes, we must
// remove the entire node (nodeOuterRange).
removeStart = (
first.range ||
( first.node.isContent() ? first.nodeOuterRange : first.nodeRange )
).start;
removeEnd = (
last.range ||
( last.node.isContent() ? last.nodeOuterRange : last.nodeRange )
).end;
}
this.pushRetain( removeStart - currentOffset );
removeEnd = this.addSafeRemoveOps( doc, removeStart, removeEnd, removeMetadata );
// All done
return removeEnd;
}
// The selection wasn't mergeable, so remove nodes that are completely covered, and strip
// nodes that aren't
for ( var i = 0; i < selection.length; i++ ) {
var nodeStart, nodeEnd;
if ( !selection[ i ].range ) {
// Entire node is covered, remove it
nodeStart = selection[ i ].nodeOuterRange.start;
nodeEnd = selection[ i ].nodeOuterRange.end;
} else {
// Part of the node is covered, remove that range
nodeStart = selection[ i ].range.start;
nodeEnd = selection[ i ].range.end;
}
// Merge contiguous removals. Only apply a removal when a gap appears, or at the
// end of the loop
if ( removeEnd === null ) {
// First removal
removeStart = nodeStart;
removeEnd = nodeEnd;
} else if ( removeEnd === nodeStart ) {
// Merge this removal into the previous one
removeEnd = nodeEnd;
} else {
// There is a gap between the previous removal and this one
// Push the previous removal first
this.pushRetain( removeStart - offset );
offset = this.addSafeRemoveOps( doc, removeStart, removeEnd, removeMetadata );
// Now start this removal
removeStart = nodeStart;
removeEnd = nodeEnd;
}
}
// Apply the last removal, if any
Eif ( removeEnd !== null ) {
this.pushRetain( removeStart - offset );
offset = this.addSafeRemoveOps( doc, removeStart, removeEnd, removeMetadata );
}
return offset;
};
/**
* Insert meta items, as near to the current transaction end as is legal
*
* @param {ve.dm.Document} doc Document in pre-transaction state
* @param {number} offset Offset of the end of the current (partial) operations list
* @param {Array} metaItems linear data containing just meta items
*/
ve.dm.TransactionBuilder.prototype.pushMeta = function ( doc, offset, metaItems ) {
var position = null,
ops = this.transaction.operations,
relDepth = 0;
if ( ops.length === 0 ) {
ops.push( {
type: 'replace',
remove: [],
insert: metaItems
} );
return;
}
// Start at the current end of the transaction
position = { opIndex: ops.length - 1, itemIndex: ops[ ops.length - 1 ].length };
var op;
// Walk backwards over the linear data as it will be after the transaction is
// applied, tracking depth, and disregarding tags deeper than the depth at offset.
// - If we hit a structural open tag with restricted childNodeTypes (like list) then
// move position to just before the tag, and keep walking
// - If we hit a structural open tag with unrestricted childNodeTypes, or the document
// start, then position is fine: insert metaItems there and return
findPositionLoop:
for ( var i = ops.length - 1; i >= 0; i-- ) {
op = ops[ i ];
var items;
if ( op.type === 'replace' ) {
items = op.insert;
offset -= op.remove.length;
} else if ( op.type === 'retain' ) {
items = doc.getData( new ve.Range( offset - op.length, offset ) );
offset -= op.length;
} else E{
// attribute/annotate: do nothing
continue;
}
for ( var j = items.length - 1; j >= 0; j-- ) {
var type = items[ j ].type;
if ( !type || typeof type !== 'string' ) {
continue;
}
if ( type.charAt( 0 ) === '/' ) {
// Close element, so going backwards we're getting deeper
relDepth++;
continue;
}
// Else open element
relDepth--;
if ( relDepth >= 0 ) {
continue;
// TODO: This could be a long walk. Do we want to infer stuff
// from element types we see at relDepth 0? For instance, if
// we see a structural node at the same depth as position, with
// unrestricted parentNodeTypes, could we perhaps infer that
// position is a legal place for metadata without walking the
// whole 874 miles to the start of the document?
//
// This is not an immediate priority because for text
// replacement during typing (the main performance-critical use
// case) we only have to walk back to the start of the CBN,
// which is unlikely to be far.
}
// We won't let relDepth go below -1 (see below), so this element is
// the parent of position
if (
!ve.dm.nodeFactory.canNodeContainContent( type ) &&
!ve.dm.nodeFactory.getChildNodeTypes( type )
) {
// This is a legal parent for metadata
break findPositionLoop;
}
// Else not a legal parent for metadata: move position up and continue
position = { opIndex: i, itemIndex: j };
relDepth = 0;
}
}
op = ops[ position.opIndex ];
if ( op.type === 'replace' ) {
ve.batchSplice( op.insert, position.itemIndex, 0, metaItems );
return;
}
// Else it's a retain op (it cannot be attribute/annotate because we skip those above)
Eif ( position.itemIndex > 0 ) {
ops.splice( position.opIndex, 0, {
type: 'retain',
length: position.itemIndex
} );
position.opIndex++;
}
ops.splice( position.opIndex, 0, {
type: 'replace',
remove: [],
insert: metaItems
} );
op.length -= position.itemIndex;
if ( op.length === 0 ) {
ops.splice( position.opIndex + 1, 1 );
}
// TODO: normalize resulting consecutive replace ops?
};
|