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Version: v1

MergeTree Class

Signature​

export declare class MergeTree

Constructors​

Constructor Description
(constructor)(options) Constructs a new instance of the MergeTree class

Static Properties​

Property Type Description
options { incrementalUpdate: boolean; insertAfterRemovedSegs: boolean; zamboniSegments: boolean; }

Properties​

Property Modifiers Type Description
collabWindow CollaborationWindow
length number Returns the current length of the MergeTree for the local client.
mergeTreeDeltaCallback optional MergeTreeDeltaCallback
mergeTreeMaintenanceCallback optional MergeTreeMaintenanceCallback
options optional PropertySet | undefined
pendingSegments List<SegmentGroup> | undefined
root IMergeBlock

Methods​

Method Alerts Return Type Description
ackPendingSegment(opArgs) void Assign sequence number to existing segment; update partial lengths to reflect the change
addLocalReference(lref) Deprecated void
addMinSeqListener(minRequired, onMinGE) void
annotateRange(start, end, props, combiningOp, refSeq, clientId, seq, opArgs) void Annotate a range with properties
blockClone(block, segments) MergeBlock
clone() void
createLocalReferencePosition(segment, offset, refType, properties, client) LocalReferencePosition
findTile(startPos, clientId, tileLabel, posPrecedesTile) { tile: ReferencePosition; pos: number; } | undefined
getCollabWindow() CollaborationWindow
getContainingSegment(pos, refSeq, clientId) { segment: T | undefined; offset: number | undefined; }
getLength(refSeq, clientId) number
getMarkerFromId(id) ISegment | undefined
getPosition(node, refSeq, clientId) number
getStackContext(startPos, clientId, rangeLabels) RangeStackMap
getStats() MergeTreeStats
incrementalBlockMap(stateStack) void
insertAtReferencePosition(referencePosition, insertSegment, opArgs) void
insertSegments(pos, segments, refSeq, clientId, seq, opArgs) void
localNetLength(segment) number
map(actions, refSeq, clientId, accum) void
mapIdToSegment(id, segment) void
mapRange(actions, refSeq, clientId, accum, start, end, splitRange) void
markRangeRemoved(start, end, refSeq, clientId, seq, overwrite, opArgs) void
posFromRelativePos(relativePos, refseq, clientId) number Given a position specified relative to a marker id, lookup the marker and convert the position to a character position.
referencePositionToLocalPosition(refPos, refSeq, clientId) number
reloadFromSegments(segments) void
removeLocalReference(segment, lref) Deprecated void
removeLocalReferencePosition(lref) LocalReferencePosition | undefined
resolveRemoteClientPosition(remoteClientPosition, remoteClientRefSeq, remoteClientId) number | undefined Resolves a remote client's position against the local sequence and returns the remote client's position relative to the local sequence. The client ref seq must be above the minimum sequence number or the return value will be undefined. Generally this method is used in conjunction with signals which provide point in time values for the below parameters, and is useful for things like displaying user position. It should not be used with persisted values as persisted values will quickly become invalid as the remoteClientRefSeq moves below the minimum sequence number
setMinSeq(minSeq) void
startCollaboration(localClientId, minSeq, currentSeq) void
walkAllSegments(block, action, accum) boolean

Constructor Details​

(constructor)​

Constructs a new instance of the MergeTree class

Signature​
constructor(options?: PropertySet | undefined);

Parameters​

Parameter Modifiers Type Description
options optional PropertySet | undefined

Property Details​

collabWindow​

Signature​
readonly collabWindow: CollaborationWindow;

Type: CollaborationWindow

length​

Returns the current length of the MergeTree for the local client.

Signature​
get length(): number;

Type: number

mergeTreeDeltaCallback​

Signature​
mergeTreeDeltaCallback?: MergeTreeDeltaCallback;

Type: MergeTreeDeltaCallback

mergeTreeMaintenanceCallback​

Signature​
mergeTreeMaintenanceCallback?: MergeTreeMaintenanceCallback;

Type: MergeTreeMaintenanceCallback

options​

Signature​
options?: PropertySet | undefined;

Type: PropertySet | undefined

options​

Signature​
static readonly options: {
        incrementalUpdate: boolean;
        insertAfterRemovedSegs: boolean;
        zamboniSegments: boolean;
    };

Type: { incrementalUpdate: boolean; insertAfterRemovedSegs: boolean; zamboniSegments: boolean; }

pendingSegments​

Signature​
pendingSegments: List<SegmentGroup> | undefined;

Type: List<SegmentGroup> | undefined

root​

Signature​
root: IMergeBlock;

Type: IMergeBlock

Method Details​

ackPendingSegment​

Assign sequence number to existing segment; update partial lengths to reflect the change

Signature​
ackPendingSegment(opArgs: IMergeTreeDeltaOpArgs): void;

Parameters​

Parameter Type Description
opArgs IMergeTreeDeltaOpArgs

addLocalReference​

This API is deprecated and will be removed in a future release.
  • use createLocalReference
Signature​
addLocalReference(lref: LocalReference): void;

Parameters​

Parameter Type Description
lref LocalReference

addMinSeqListener​

Signature​
addMinSeqListener(minRequired: number, onMinGE: (minSeq: number) => void): void;

Parameters​

Parameter Type Description
minRequired number
onMinGE (minSeq: number) => void

annotateRange​

Annotate a range with properties

Signature​
annotateRange(start: number, end: number, props: PropertySet, combiningOp: ICombiningOp | undefined, refSeq: number, clientId: number, seq: number, opArgs: IMergeTreeDeltaOpArgs): void;

Parameters​

Parameter Type Description
start number The inclusive start position of the range to annotate
end number The exclusive end position of the range to annotate
props PropertySet The properties to annotate the range with
combiningOp ICombiningOp | undefined Optional. Specifies how to combine values for the property, such as "incr" for increment.
refSeq number The reference sequence number to use to apply the annotate
clientId number The id of the client making the annotate
seq number The sequence number of the annotate operation
opArgs IMergeTreeDeltaOpArgs The op args for the annotate op. this is passed to the merge tree callback if there is one

blockClone​

Signature​
blockClone(block: IMergeBlock, segments?: ISegment[]): MergeBlock;

Parameters​

Parameter Modifiers Type Description
block IMergeBlock
segments optional ISegment[]

Returns​

Return type: MergeBlock

clone​

Signature​
clone(): void;

createLocalReferencePosition​

Signature​
createLocalReferencePosition(segment: ISegment, offset: number | undefined, refType: ReferenceType, properties: PropertySet | undefined, client: Client): LocalReferencePosition;

Parameters​

Parameter Type Description
segment ISegment
offset number | undefined
refType ReferenceType
properties PropertySet | undefined
client Client

Returns​

Return type: LocalReferencePosition

findTile​

Signature​
findTile(startPos: number, clientId: number, tileLabel: string, posPrecedesTile?: boolean): {
        tile: ReferencePosition;
        pos: number;
    } | undefined;

Parameters​

Parameter Modifiers Type Description
startPos number
clientId number
tileLabel string
posPrecedesTile optional boolean

Returns​

Return type: { tile: ReferencePosition; pos: number; } | undefined

getCollabWindow​

Signature​
getCollabWindow(): CollaborationWindow;

Returns​

Return type: CollaborationWindow

getContainingSegment​

Signature​
getContainingSegment<T extends ISegment>(pos: number, refSeq: number, clientId: number): {
        segment: T | undefined;
        offset: number | undefined;
    };
Type Parameters​
Parameter Constraint Description
T ISegment

Parameters​

Parameter Type Description
pos number
refSeq number
clientId number

Returns​

Return type: { segment: T | undefined; offset: number | undefined; }

getLength​

Signature​
getLength(refSeq: number, clientId: number): number;

Parameters​

Parameter Type Description
refSeq number
clientId number

Returns​

Return type: number

getMarkerFromId​

Signature​
getMarkerFromId(id: string): ISegment | undefined;

Parameters​

Parameter Type Description
id string

Returns​

Return type: ISegment | undefined

getPosition​

Signature​
getPosition(node: MergeNode, refSeq: number, clientId: number): number;

Parameters​

Parameter Type Description
node MergeNode
refSeq number
clientId number

Returns​

Return type: number

getStackContext​

Signature​
getStackContext(startPos: number, clientId: number, rangeLabels: string[]): RangeStackMap;

Parameters​

Parameter Type Description
startPos number
clientId number
rangeLabels string[]

Returns​

Return type: RangeStackMap

getStats​

Signature​
getStats(): MergeTreeStats;

Returns​

Return type: MergeTreeStats

incrementalBlockMap​

Signature​
incrementalBlockMap<TContext>(stateStack: Stack<IncrementalMapState<TContext>>): void;
Type Parameters​
Parameter Description
TContext

Parameters​

Parameter Type Description
stateStack Stack<IncrementalMapState<TContext>>

insertAtReferencePosition​

Signature​
insertAtReferencePosition(referencePosition: ReferencePosition, insertSegment: ISegment, opArgs: IMergeTreeDeltaOpArgs): void;

Parameters​

Parameter Type Description
referencePosition ReferencePosition
insertSegment ISegment
opArgs IMergeTreeDeltaOpArgs

insertSegments​

Signature​
insertSegments(pos: number, segments: ISegment[], refSeq: number, clientId: number, seq: number, opArgs: IMergeTreeDeltaOpArgs | undefined): void;

Parameters​

Parameter Type Description
pos number
segments ISegment[]
refSeq number
clientId number
seq number
opArgs IMergeTreeDeltaOpArgs | undefined

localNetLength​

Signature​
localNetLength(segment: ISegment): number;

Parameters​

Parameter Type Description
segment ISegment

Returns​

Return type: number

map​

Signature​
map<TClientData>(actions: SegmentActions<TClientData>, refSeq: number, clientId: number, accum: TClientData): void;
Type Parameters​
Parameter Description
TClientData

Parameters​

Parameter Type Description
actions SegmentActions<TClientData>
refSeq number
clientId number
accum TClientData

mapIdToSegment​

Signature​
mapIdToSegment(id: string, segment: ISegment): void;

Parameters​

Parameter Type Description
id string
segment ISegment

mapRange​

Signature​
mapRange<TClientData>(actions: SegmentActions<TClientData>, refSeq: number, clientId: number, accum: TClientData, start?: number, end?: number, splitRange?: boolean): void;
Type Parameters​
Parameter Description
TClientData

Parameters​

Parameter Modifiers Type Description
actions SegmentActions<TClientData>
refSeq number
clientId number
accum TClientData
start optional number
end optional number
splitRange optional boolean

markRangeRemoved​

Signature​
markRangeRemoved(start: number, end: number, refSeq: number, clientId: number, seq: number, overwrite: boolean | undefined, opArgs: IMergeTreeDeltaOpArgs): void;

Parameters​

Parameter Type Description
start number
end number
refSeq number
clientId number
seq number
overwrite boolean | undefined
opArgs IMergeTreeDeltaOpArgs

posFromRelativePos​

Given a position specified relative to a marker id, lookup the marker and convert the position to a character position.

Signature​
posFromRelativePos(relativePos: IRelativePosition, refseq?: number, clientId?: number): number;

Parameters​

Parameter Modifiers Type Description
relativePos IRelativePosition Id of marker (may be indirect) and whether position is before or after marker.
refseq optional number The reference sequence number at which to compute the position.
clientId optional number The client id with which to compute the position.

Returns​

Return type: number

referencePositionToLocalPosition​

Signature​
referencePositionToLocalPosition(refPos: ReferencePosition, refSeq?: number, clientId?: number): number;

Parameters​

Parameter Modifiers Type Description
refPos ReferencePosition
refSeq optional number
clientId optional number

Returns​

Return type: number

reloadFromSegments​

Signature​
reloadFromSegments(segments: ISegment[]): void;

Parameters​

Parameter Type Description
segments ISegment[]

removeLocalReference​

This API is deprecated and will be removed in a future release.
  • use removeLocalReferencePosition
Signature​
removeLocalReference(segment: ISegment, lref: LocalReference): void;

Parameters​

Parameter Type Description
segment ISegment
lref LocalReference

removeLocalReferencePosition​

Signature​
removeLocalReferencePosition(lref: LocalReferencePosition): LocalReferencePosition | undefined;

Parameters​

Parameter Type Description
lref LocalReferencePosition

Returns​

Return type: LocalReferencePosition | undefined

resolveRemoteClientPosition​

Resolves a remote client's position against the local sequence and returns the remote client's position relative to the local sequence. The client ref seq must be above the minimum sequence number or the return value will be undefined. Generally this method is used in conjunction with signals which provide point in time values for the below parameters, and is useful for things like displaying user position. It should not be used with persisted values as persisted values will quickly become invalid as the remoteClientRefSeq moves below the minimum sequence number

Signature​
resolveRemoteClientPosition(remoteClientPosition: number, remoteClientRefSeq: number, remoteClientId: number): number | undefined;

Parameters​

Parameter Type Description
remoteClientPosition number The remote client's position to resolve
remoteClientRefSeq number The reference sequence number of the remote client
remoteClientId number The client id of the remote client

Returns​

Return type: number | undefined

setMinSeq​

Signature​
setMinSeq(minSeq: number): void;

Parameters​

Parameter Type Description
minSeq number

startCollaboration​

Signature​
startCollaboration(localClientId: number, minSeq: number, currentSeq: number): void;

Parameters​

Parameter Type Description
localClientId number
minSeq number
currentSeq number

walkAllSegments​

Signature​
walkAllSegments<TClientData>(block: IMergeBlock, action: (segment: ISegment, accum?: TClientData) => boolean, accum?: TClientData): boolean;
Type Parameters​
Parameter Description
TClientData

Parameters​

Parameter Modifiers Type Description
block IMergeBlock
action (segment: ISegment, accum?: TClientData) => boolean
accum optional TClientData

Returns​

Return type: boolean