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Update Ranges Tracker

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This commit is contained in:
James Allen 2017-02-16 17:09:08 +01:00
parent a33d4f505b
commit de7f760ea4
1 changed files with 21 additions and 3 deletions
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24
services/document-updater/app/coffee/RangesTracker.coffee
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@ -105,6 +105,7 @@ load = (EventEmitter) ->
throw new Error("unknown op type")
addComment: (op, metadata) ->
# TODO: Don't allow overlapping comments?
@comments.push comment = {
id: op.t or @newId()
op: # Copy because we'll modify in place
@ -167,12 +168,14 @@ load = (EventEmitter) ->
op_length = op.i.length
op_end = op.p + op_length
already_merged = false
previous_change = null
moved_changes = []
remove_changes = []
new_changes = []
for change in @changes
for change, i in @changes
change_start = change.op.p
if change.op.d?
@ -200,6 +203,16 @@ load = (EventEmitter) ->
# Only merge inserts if they are from the same user
is_same_user = metadata.user_id == change.metadata.user_id
# If this is an insert op at the end of an existing insert with a delete following, and it cancels out the following
# delete then we shouldn't append it to this insert, but instead only cancel the following delete.
# E.g.
# foo|<--- about to insert 'b' here
# inserted 'foo' --^ ^-- deleted 'bar'
# should become just 'foo' not 'foob' (with the delete marker becoming just 'ar'), .
next_change = @changes[i+1]
is_op_adjacent_to_next_delete = next_change? and next_change.op.d? and op.p == change_end and next_change.op.p == op.p
will_op_cancel_next_delete = is_op_adjacent_to_next_delete and next_change.op.d.slice(0, op.i.length) == op.i
# If there is a delete at the start of the insert, and we're inserting
# at the start, we SHOULDN'T merge since the delete acts as a partition.
# The previous op will be the delete, but it's already been shifted by this insert
@ -222,7 +235,8 @@ load = (EventEmitter) ->
if @track_changes and
is_change_overlapping and
!is_insert_blocked_by_delete and
!already_merged and
!already_merged and
!will_op_cancel_next_delete and
is_same_user
offset = op_start - change_start
change.op.i = change.op.i.slice(0, offset) + op.i + change.op.i.slice(offset)
@ -396,9 +410,13 @@ load = (EventEmitter) ->
@emit "changes:moved", moved_changes
_addOp: (op, metadata) ->
# Don't take a reference to the existing op since we'll modify this in place with future changes
clone_op = {}
for k,v of op
clone_op[k] = v
change = {
id: @newId()
op: op
op: clone_op
metadata: metadata
}
@changes.push change