The way we implemented undoing transactions was horrible. We'd process
the original transaction, but with a reversed=true flag. That meant we
had to keep track of the 'reversed' flag everywhere, and use ternaries
like insert = reversed ? op.remove : op.insert; all over the place to
access transaction operations. Redo then worked by reapplying the
transaction. We would verify that this was OK by tracking whether the
transaction was in an applied state or an undone state.
This commit makes it so every transaction can only be applied once. To
undo, you obtain a mirror image of the transaction with tx.reverse(),
then apply that. To redo, you clone the original transaction with
tx.clone() and apply that. All the code that had to use ternaries to
check whether the transaction was being applied in reverse or not is
gone now, because you can only apply a given transaction forwards,
never in reverse.
Bonus:
* Make ve.dm.Document's .completeHistory a simple array of
transactions, rather than transaction/boolean pairs
* In the protection of double application test, clone the example
document properly; it modified ve.dm.example.data, which was "fine"
because it ran .commit() and .rollback() the same number of times
Change-Id: I3050c5430be4a12510f22e20853560b92acebb67
The previous implementation couldn't deal with transactions that
replaced both data and metadata at the same time (rather than replacing
data while moving metadata around), and extending its approach to
deal with that case would have made it much more complex.
So I rewrote the algorithm from scratch. The previous implementation
scheduled deferred moves for existing items, but immediately processed
insertions and removals. This is problematic for replacements and
maintaining the order in the binary search list. So instead, this new
implementation builds an array representing what the new item list
should be, then processes insertions, removals and moves in the correct
order to achieve that state.
It looks like the previous implementation didn't always work correctly,
which was masked because the test suite passed full=false to
assertItemsMatchMetadata(). This rewrite fixes this.
Also remove setMove/applyMove from MetaItem, because we don't need them
anymore and they're evil anyway; and add isAttached(), because the new
algorithm needs it.
Change-Id: I899d2b3c94c2cfa55823879bca95456750f64382
Doing retainMetadata followed by a replace (not replaceMetadata)
doesn't make any sense and its behavior is undefined, so don't do that
in the test suite.
Change-Id: Ica032b0a5122d24e40e43e3eb43fea940270aece
Due to the "es5: true" jshint option we enabled, these
warnings were surpressed. I've disabled the option since
we no longer require it. It was enabled in 07c86fc to fix
a bug with jshint. This bug has now been fixed.
Change-Id: I55b7d031eb5581af5f733f050cf2ea98dacb2af6
ve.dm.Transaction
* Replace operations are now built directly from the
linear model and automatically determine what metadata
replace information they need to include:
** retainMetadata
** replaceMetadata
** insertMetadata
ve.dm.Document
* Metadata array created empty and padded out after data parsing
as we are no longer using Document.spliceData to build it (a new
test checks for correct metadata length)
* spliceData replaced with getMetadataReplace, which instead returns
transactional steps of spliceData (retain, replace, insert)
ve.dm.MetaLinearData
* Add function for merging metadata items together. Only used
once in the code (Document.getMetadataReplace) but useful
for generating test data.
ve.dm.MetaList
* Replace operations with metadata need to calculate new offset
and indices directly, but can't be applied immediately lest they
put a metaItem out of place and affect findItem.
ve.dm.MetaItem
* Add methods to support queued moves as required by MetaList
Test files
* Updated to match new pushReplace API
* Remove any instances of Document.spliceData
* Extra check on sparse metadata array length
* Rewrite spliceData tests as getMetadataReplace tests
* Count expected cases in Transaction(Processor) tests
Bug: 46954
Change-Id: I4edad1c2dd37c723bff2792bab7d694ef17a86dc
They worked fine with just one group, but once Rob added a second group
everything came falling down.
* Index the return value of findItem() into the correct array
(list.items for all, list.groups[groupname] for groups)
* Expect null if there is something at the coordinates but it's in the
wrong group
* Keep track of the next index and expect that for forInsertion when
findItem() returned null, as well as at the end of each offset
Change-Id: I76438f583cea5694ce04fa2f4e7e88f8f8f236d1
Created an IndexValueStore class which can store any object and return
an integer index to its hash map.
Linear data is now stored in ve.dm.LinearData instances. Two subclasses
for element and meta data contain methods specific to those data types
(ElementLinearData and MetaLinearData).
The static methods in ve.dm.Document that inspected data at a given
offset are now instance methods of ve.dm.ElementLinearData.
AnnotationSets (which are no longer OrderedHashSets) have been moved
to /dm and also have to be instantiated with a pointer the store.
Bug: 46320
Change-Id: I249a5d48726093d1cb3e36351893f4bff85f52e2
Add .insertMeta() and .removeMeta() methods to insert and remove
metadata through the meta list. For convenience, there is also a
.remove() method in MetaItem that wraps around removeMeta().
Also rename insertItem() and removeItem() to addInsertedItem() and
deleteRemovedItem() to avoid confusion, and make the MetaList
constructor take a dm.Surface rather than a document so we can call
change().
Change-Id: I4b62a3109404cfd56f5de68938e1db908b03e678
Previously these were static functions in TransactionProcessor
which instantiated a TP called .process() on it. These are now
methods of ve.dm.Document.
Also moved the emission of the 'transact' event on the document from
TransactionProcessor to Document itself, and moved the tests asserting
double application is protected against from TP to Document (because
the corresponding code moved as well).
Change-Id: I7c9f22a14accaf0ba1f70d5aa4f0573bb7e677d0
A MetaList is a collection of MetaItems representing all of the
metadata in a ve.dm.Document, and it updates itself live as the
underlying document changes.
Currently this interface is read-only, I'll add mutators next.
Change-Id: If7bfc9563af37e22dcdca9a682d6decc2f6f1872
