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Do two passes better

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This commit is contained in:
James Allen 2013-08-23 14:58:00 +01:00
parent dbee4a57fb
commit dab2781e87
1 changed files with 5 additions and 31 deletions
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36
services/track-changes/app/coffee/ConcatManager.coffee
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@ -19,7 +19,7 @@ module.exports = ConcatManager =
for update in rawUpdates
lastCompressedUpdate = firstPass.pop()
if lastCompressedUpdate?
firstPass = firstPass.concat ConcatManager._concatTwoUpdatesOfTheSameType lastCompressedUpdate, update
firstPass = firstPass.concat ConcatManager._concatTwoUpdates lastCompressedUpdate, update, false
else
firstPass.push rawUpdate
@ -28,7 +28,7 @@ module.exports = ConcatManager =
for update in firstPass
lastCompressedUpdate = secondPass.pop()
if lastCompressedUpdate?
secondPass = secondPass.concat ConcatManager._cancelOppositeInsertsAndDeletes lastCompressedUpdate, update
secondPass = secondPass.concat ConcatManager._concatTwoUpdates lastCompressedUpdate, update, true
else
secondPass.push update
@ -36,7 +36,7 @@ module.exports = ConcatManager =
MAX_TIME_BETWEEN_UPDATES: oneMinute = 60 * 1000
_concatTwoUpdatesOfTheSameType: (firstUpdate, secondUpdate) ->
_concatTwoUpdates: (firstUpdate, secondUpdate, mergeInsertsAndDeletes) ->
firstUpdate =
op: firstUpdate.op
meta:
@ -82,34 +82,8 @@ module.exports = ConcatManager =
d: strInject(secondOp.d, firstOp.p - secondOp.p, firstOp.d)
]
]
else
return [firstUpdate, secondUpdate]
_cancelOppositeInsertsAndDeletes: (firstUpdate, secondUpdate) ->
firstUpdate =
op: firstUpdate.op
meta:
user_id: firstUpdate.meta.user_id or null
start_ts: firstUpdate.meta.start_ts or firstUpdate.meta.ts
end_ts: firstUpdate.meta.end_ts or firstUpdate.meta.ts
secondUpdate =
op: secondUpdate.op
meta:
user_id: secondUpdate.meta.user_id or null
start_ts: secondUpdate.meta.start_ts or secondUpdate.meta.ts
end_ts: secondUpdate.meta.end_ts or secondUpdate.meta.ts
if firstUpdate.meta.user_id != secondUpdate.meta.user_id
return [firstUpdate, secondUpdate]
if secondUpdate.meta.start_ts - firstUpdate.meta.end_ts > ConcatManager.MAX_TIME_BETWEEN_UPDATES
return [firstUpdate, secondUpdate]
firstOp = firstUpdate.op[0]
secondOp = secondUpdate.op[0]
# An insert and then a delete
if firstOp.i? and secondOp.d? and firstOp.p <= secondOp.p <= (firstOp.p + firstOp.i.length)
if mergeInsertsAndDeletes and firstOp.i? and secondOp.d? and firstOp.p <= secondOp.p <= (firstOp.p + firstOp.i.length)
offset = secondOp.p - firstOp.p
insertedText = firstOp.i.slice(offset, offset + secondOp.d.length)
if insertedText == secondOp.d
@ -128,7 +102,7 @@ module.exports = ConcatManager =
else
# This shouldn't be possible!
return [firstUpdate, secondUpdate]
else if firstOp.d? and secondOp.i? and firstOp.p == secondOp.p
else if mergeInsertsAndDeletes and firstOp.d? and secondOp.i? and firstOp.p == secondOp.p
offset = firstOp.d.indexOf(secondOp.i)
if offset == -1
return [firstUpdate, secondUpdate]