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* VisualEditor DataModel rebase client class.
*
* @copyright See AUTHORS.txt
*/
/**
* DataModel rebase client
*
* @class
*/
ve.dm.RebaseClient = function VeDmRebaseClient() {
/**
* @property {number} authorId Author ID
*/
this.authorId = null;
/**
* @property {number} commitLength Offset up to which we know we have no differences with the server
*/
this.commitLength = 0;
/**
* @property {number} sentLength Offset up to which we have no unsent changes
*/
this.sentLength = 0;
/**
* @property {number} backtrack Number of transactions backtracked (i.e. rejected) since the last send
*/
this.backtrack = 0;
};
/* Inheritance */
OO.initClass( ve.dm.RebaseClient );
/* Abstract methods */
/**
* @abstract
* @param {number} start Start point for the change
* @param {boolean} toSubmit If true, mark current selection as sent
* @return {ve.dm.Change} The change since start in the client's local history
*/
ve.dm.RebaseClient.prototype.getChangeSince = null;
/**
* @abstract
* @param {number} backtrack Number of rejected changes backtracked immediately before this change
* @param {ve.dm.Change} change The change to send
*/
ve.dm.RebaseClient.prototype.sendChange = null;
/**
* Apply a change to the surface, and add it to the history
*
* @abstract
* @param {ve.dm.Change} change The change to apply
*/
ve.dm.RebaseClient.prototype.applyChange = null;
/**
* Unapply a change from the surface, and remove it from the history
*
* @abstract
* @param {ve.dm.Change} change The change to unapply
*/
ve.dm.RebaseClient.prototype.unapplyChange = null;
/**
* Add a change to history, without applying it to the surface
*
* @abstract
* @param {ve.dm.Change} change The change to add
*/
ve.dm.RebaseClient.prototype.addToHistory = null;
/**
* Remove a change from history, without unapplying it to the surface
*
* @abstract
* @param {ve.dm.Change} change The change to remove
*/
ve.dm.RebaseClient.prototype.removeFromHistory = null;
/**
* Add an event to the log. Default implementation does nothing; subclasses should override this
* if they want to collect logs.
*
* @param {Object} event Event data
*/
ve.dm.RebaseClient.prototype.logEvent = function () {};
/* Methods */
/**
* @return {number} Author ID
*/
ve.dm.RebaseClient.prototype.getAuthorId = function () {
return this.authorId;
};
/**
* @param {number} authorId Author ID
*/
ve.dm.RebaseClient.prototype.setAuthorId = function ( authorId ) {
this.authorId = authorId;
};
/**
* Submit all outstanding changes
*
* This will submit all transactions that exist in local history but have not been broadcast
* by the server.
*/
ve.dm.RebaseClient.prototype.submitChange = function () {
const change = this.getChangeSince( this.sentLength, true );
Iif ( change.isEmpty() ) {
return;
}
// logEvent before sendChange, for the case where the log entry is sent to the server
// over the same tunnel as the change, so that there's no way the server will log
// receiving the change before it receives the submitChange message.
this.logEvent( {
type: 'submitChange',
change: change,
backtrack: this.backtrack
} );
this.sendChange( this.backtrack, change );
this.backtrack = 0;
this.sentLength += change.getLength();
};
/**
* Accept a committed change from the server
*
* If the committed change is by the local author, then it is already applied to the document
* and at the correct point in history: just move the commitLength pointer.
*
* If the commited change is by a different author, then:
* - Rebase local uncommitted changes over the committed change
* - If there is a rejected tail, then apply its inverse to the document
* - Apply the rebase-transposed committed change to the document
* - Rewrite history to have the committed change followed by rebased uncommitted changes
*
* @param {ve.dm.Change} change The committed change from the server
*/
ve.dm.RebaseClient.prototype.acceptChange = function ( change ) {
const authorId = change.firstAuthorId(),
logResult = {};
Iif ( !authorId ) {
return;
}
let result;
const unsent = this.getChangeSince( this.sentLength, false );
if (
authorId !== this.getAuthorId() ||
change.start + change.getLength() > this.sentLength
) {
let uncommitted = this.getChangeSince( this.commitLength, false );
result = ve.dm.Change.static.rebaseUncommittedChange( change, uncommitted );
if ( result.rejected ) {
// Undo rejected tail, and mark unsent and backtracked if necessary
this.unapplyChange( result.rejected );
uncommitted = uncommitted.truncate( result.rejected.start - uncommitted.start );
Eif ( this.sentLength > result.rejected.start ) {
this.backtrack += this.sentLength - result.rejected.start;
}
this.sentLength = result.rejected.start;
}
// We are already right by definition about our own selection
delete result.transposedHistory.selections[ this.getAuthorId() ];
this.applyChange( result.transposedHistory );
// Rewrite history
this.removeFromHistory( result.transposedHistory );
this.removeFromHistory( uncommitted );
this.addToHistory( change );
this.addToHistory( result.rebased );
this.sentLength += change.getLength();
}
this.commitLength += change.getLength();
// Only log the result if it's "interesting", i.e. we rebased or rejected something of nonzero length
if ( result ) {
if ( result.rebased.getLength() > 0 || result.rejected ) {
logResult.rebased = result.rebased;
logResult.transposedHistory = result.transposedHistory;
}
if ( result.rejected ) {
logResult.rejected = result.rejected;
}
}
if ( unsent.getLength() > 0 ) {
logResult.unsent = unsent;
}
this.logEvent( ve.extendObject( {
type: 'acceptChange',
authorId: authorId,
change: [ change.start, change.getLength() ]
}, logResult ) );
};
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