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import { DiGenerator } from './di-generator';
import { layoutScope } from './hierarchy/subprocess-layout';
import {
layoutProcessLanes,
routeMessageFlow,
isMessageCorridorBlocked,
} from './hierarchy/swimlane-layout';
import { layoutAllLabels, type PlacedEdge, type PlacedShape } from './graph/label-layout';
import { normalizePlaneOrigin } from './plane-normalization';
import { validateFlowContainers } from './validation/bpmn-validation';
import { collectPlaneDiagnostics, type LayoutWarning } from './layout-warnings';
import { alignVerticallyStackedPaths, alignIntraProcessBranches } from './hierarchy/path-alignment';
import type { AutoLayoutOptions, Bounds } from './types';
interface PoolEntry {
element: any;
bounds: Bounds;
lanes?: Array<{ element: any; bounds: Bounds }>;
}
interface ParticipantLayoutParams {
participant: any;
process: any;
currentY: number;
allShapesMap: Map<string, Bounds>;
allShapes: PlacedShape[];
allEdges: PlacedEdge[];
allLanes: Array<{ element: any; bounds: Bounds }>;
allPools: PoolEntry[];
}
interface PoolAndLanesParams {
participant: any;
process: any;
result: any;
currentY: number;
hasLanes: boolean;
allLanes?: Array<{ element: any; bounds: Bounds }>;
allPools: PoolEntry[];
}
export class LayoutEngine {
private moddle: BPMNModdle;
private diGenerator: DiGenerator;
private options?: AutoLayoutOptions;
constructor(options?: AutoLayoutOptions) {
this.options = options;
this.moddle = new BpmnModdle(options?.moddleExtensions);
this.diGenerator = new DiGenerator(this.moddle);
}
public async layout(xml: string): Promise<string> {
const result = await this.layoutWithDiagnostics(xml);
return result.xml;
}
public async layoutWithDiagnostics(
xml: string
): Promise<{ xml: string; warnings: LayoutWarning[] }> {
const warnings: LayoutWarning[] = [];
const { rootElement } = await this.moddle.fromXML(xml);
const definitions: any = rootElement;
validateFlowContainers(definitions, this.options, warnings);
const targetElement = this.selectTargetElement(definitions);
if (!targetElement) {
const { xml: unformatted } = await this.moddle.toXML(definitions, { format: true });
return { xml: unformatted, warnings };
}
const diagram = this.diGenerator.ensureDiagram(definitions, targetElement);
diagram.plane.planeElement = [];
const collaboration = definitions.rootElements?.find(
(el: any) => el.$type === 'bpmn:Collaboration'
);
if (collaboration) {
this.layoutCollaboration(definitions, collaboration, diagram.plane);
} else {
this.layoutSingleProcesses(definitions, diagram.plane);
}
normalizePlaneOrigin(diagram.plane);
collectPlaneDiagnostics(diagram.plane, warnings);
const { xml: resultXml } = await this.moddle.toXML(definitions, { format: true });
return { xml: resultXml, warnings };
}
private selectTargetElement(definitions: any): any {
const rootElements = definitions.rootElements || [];
const collaboration = rootElements.find((el: any) => el.$type === 'bpmn:Collaboration');
if (collaboration) {
return collaboration;
}
return rootElements.find((el: any) => el.$type === 'bpmn:Process');
}
private layoutSingleProcesses(definitions: any, plane: any): void {
const processes = definitions.rootElements.filter((el: any) => el.$type === 'bpmn:Process');
let startY = 100;
for (const process of processes) {
const result = layoutScope(process, this.options);
alignIntraProcessBranches({ process, result, options: this.options });
const laneResult = layoutProcessLanes(process, result.shapes, {
startX: 100,
startY,
totalWidth: result.width,
edges: result.edges,
});
layoutAllLabels({
shapes: result.shapes,
edges: result.edges,
lanes: laneResult.lanes,
});
for (const lane of laneResult.lanes) {
this.diGenerator.addShape(plane, lane.element, lane.bounds);
}
for (const s of result.shapes) {
this.diGenerator.addShape(plane, s.element, {
...s.bounds,
isExpanded: s.isExpanded,
labelBounds: s.labelBounds,
});
}
for (const e of result.edges) {
this.diGenerator.addEdge(plane, {
bpmnElement: e.element,
waypoints: e.waypoints,
labelBounds: e.labelBounds,
});
}
startY += Math.max(result.height, laneResult.totalHeight) + 60;
}
}
private layoutCollaboration(definitions: any, collaboration: any, plane: any): void {
const participants = collaboration.participants || [];
const allShapesMap = new Map<string, Bounds>();
const allShapes: PlacedShape[] = [];
const allEdges: PlacedEdge[] = [];
const allLanes: Array<{ element: any; bounds: Bounds }> = [];
const allPools: PoolEntry[] = [];
let currentY = 80;
for (const participant of participants) {
const procRef = participant.processRef?.id || participant.processRef;
const process = definitions.rootElements.find((el: any) => el.id === procRef);
currentY = this.layoutParticipant({
participant,
process,
currentY,
allShapesMap,
allShapes,
allEdges,
allLanes,
allPools,
});
}
alignVerticallyStackedPaths({
definitions,
collaboration,
allShapesMap,
allShapes,
allEdges,
allLanes,
allPools,
});
this.routeAllMessageFlows(collaboration.messageFlows || [], allShapesMap, {
plane,
participants,
edges: allEdges,
});
layoutAllLabels({
shapes: allShapes,
edges: allEdges,
lanes: allLanes,
});
for (const pool of allPools) {
this.diGenerator.addShape(plane, pool.element, pool.bounds);
if (pool.lanes) {
for (const lane of pool.lanes) {
this.diGenerator.addShape(plane, lane.element, lane.bounds);
}
}
}
for (const s of allShapes) {
this.diGenerator.addShape(plane, s.element, {
...s.bounds,
isExpanded: s.isExpanded,
labelBounds: s.labelBounds,
});
}
for (const e of allEdges) {
this.diGenerator.addEdge(plane, {
bpmnElement: e.element,
waypoints: e.waypoints,
labelBounds: e.labelBounds,
});
}
}
private layoutParticipant(params: ParticipantLayoutParams): number {
const {
participant,
process,
currentY,
allShapesMap,
allShapes,
allEdges,
allLanes,
allPools,
} = params;
if (!process) {
const poolBounds = this.layoutBlackBoxPool(participant, currentY, allPools);
allShapesMap.set(participant.id, poolBounds);
return currentY + 160;
}
const result = layoutScope(process, this.options);
const hasLanes = Boolean(process.laneSets && process.laneSets[0]?.lanes?.length > 0);
const deltaX = hasLanes ? 0 : 150 - result.minX;
const deltaY = hasLanes ? currentY - 80 : currentY + 20 - result.minY;
for (const s of result.shapes) {
s.bounds.x += deltaX;
s.bounds.y += deltaY;
}
for (const e of result.edges) {
for (const wp of e.waypoints) {
wp.x += deltaX;
wp.y += deltaY;
}
}
const poolBounds = this.createPoolAndLanes({
participant,
process,
result,
currentY,
hasLanes,
allLanes,
allPools,
});
allShapesMap.set(participant.id, poolBounds);
for (const s of result.shapes) {
allShapesMap.set(s.element.id, s.bounds);
}
allShapes.push(...result.shapes);
allEdges.push(...result.edges);
return currentY + poolBounds.height + 60;
}
private layoutBlackBoxPool(participant: any, currentY: number, allPools?: PoolEntry[]): Bounds {
const poolBounds: Bounds = { x: 100, y: currentY, width: 400, height: 100 };
allPools?.push({ element: participant, bounds: poolBounds });
return poolBounds;
}
private createPoolAndLanes(params: PoolAndLanesParams): Bounds {
const { participant, process, result, currentY, hasLanes, allLanes, allPools } = params;
if (hasLanes) {
const laneStartX = 130;
const laneWidth = Math.max(400, result.width + 30);
const laneResult = layoutProcessLanes(process, result.shapes, {
startX: laneStartX,
startY: currentY,
totalWidth: laneWidth,
edges: result.edges,
});
const poolBounds: Bounds = {
x: 100,
y: currentY,
width: laneWidth + 30,
height: laneResult.totalHeight,
};
allPools?.push({ element: participant, bounds: poolBounds, lanes: laneResult.lanes });
allLanes?.push(...laneResult.lanes);
return poolBounds;
}
const poolBounds: Bounds = {
x: 100,
y: currentY,
width: Math.max(400, result.width + 100),
height: Math.max(120, result.height + 40),
};
allPools?.push({ element: participant, bounds: poolBounds });
return poolBounds;
}
private routeAllMessageFlows(
messageFlows: any[],
allShapesMap: Map<string, Bounds>,
options: { plane: any; participants: any[]; edges: PlacedEdge[] }
): void {
const participantIds = new Set(options.participants.map((p: any) => p.id));
const poolBoundsList = options.participants
.map((p: any) => allShapesMap.get(p.id))
.filter((b): b is Bounds => Boolean(b));
const flowNodeBounds = Array.from(allShapesMap.entries())
.filter(([id]) => !participantIds.has(id))
.map(([, b]) => b);
const flowsByTarget = new Map<string, any[]>();
for (const flow of messageFlows) {
const tgtId = flow.targetRef?.id || flow.targetRef;
if (tgtId) {
const list = flowsByTarget.get(tgtId) || [];
list.push(flow);
flowsByTarget.set(tgtId, list);
}
}
for (const flow of messageFlows) {
const srcId = flow.sourceRef?.id || flow.sourceRef;
const tgtId = flow.targetRef?.id || flow.targetRef;
const srcBounds = allShapesMap.get(srcId);
const tgtBounds = allShapesMap.get(tgtId);
if (srcBounds && tgtBounds) {
const interPoolChannelY = computeInterPoolChannelY(srcBounds, tgtBounds, poolBoundsList);
const flowsForTarget = flowsByTarget.get(tgtId)!;
const targetPortX = computeTargetPortX({
flow,
flowsForTarget,
tgtBounds,
allShapesMap,
obstacles: flowNodeBounds,
channelY: interPoolChannelY,
});
const waypoints = routeMessageFlow(srcBounds, tgtBounds, {
obstacles: flowNodeBounds,
interPoolChannelY,
targetPortX,
});
options.edges.push({ element: flow, waypoints });
}
}
}
}
export interface ApproachContext {
targetBounds: Bounds;
obstacles: Bounds[];
channelY?: number;
}
export function findEnclosingPool(bounds: Bounds, pools: Bounds[]): Bounds | undefined {
return (
pools.find((p) => p === bounds) ??
pools.find(
(p) =>
bounds.x >= p.x - 5 &&
bounds.x + bounds.width <= p.x + p.width + 5 &&
bounds.y >= p.y - 5 &&
bounds.y + bounds.height <= p.y + p.height + 5
)
);
}
export function computeInterPoolChannelY(
srcBounds: Bounds,
tgtBounds: Bounds,
pools: Bounds[]
): number | undefined {
const srcPool = findEnclosingPool(srcBounds, pools);
const tgtPool = findEnclosingPool(tgtBounds, pools);
if (!srcPool || !tgtPool || srcPool === tgtPool) {
return undefined;
}
const [upper, lower] = srcPool.y < tgtPool.y ? [srcPool, tgtPool] : [tgtPool, srcPool];
return Math.round((upper.y + upper.height + lower.y) / 2);
}
export function getEffectiveApproachX(sourceBounds: Bounds, ctx: ApproachContext): number {
const isUpward = sourceBounds.y >= ctx.targetBounds.y + ctx.targetBounds.height;
const centerX = Math.round(sourceBounds.x + sourceBounds.width / 2);
const srcY = isUpward ? sourceBounds.y : sourceBounds.y + sourceBounds.height;
const tgtY = isUpward ? ctx.targetBounds.y + ctx.targetBounds.height : ctx.targetBounds.y;
const midY = ctx.channelY ?? Math.round((srcY + tgtY) / 2);
const blocked = isMessageCorridorBlocked(centerX, [srcY, midY], {
ignore: [sourceBounds, ctx.targetBounds],
obstacles: ctx.obstacles,
});
if (blocked) {
return sourceBounds.x + sourceBounds.width + 20;
}
return centerX;
}
export interface TargetPortParams {
flow: any;
flowsForTarget: any[];
tgtBounds: Bounds;
allShapesMap: Map<string, Bounds>;
obstacles: Bounds[];
channelY?: number;
}
export function computeTargetPortX(params: TargetPortParams): number | undefined {
const { flow, flowsForTarget, tgtBounds, allShapesMap, obstacles, channelY } = params;
if (flowsForTarget.length <= 1) {
return undefined;
}
const sorted = [...flowsForTarget].sort((a, b) => {
const srcA = allShapesMap.get(a.sourceRef?.id || a.sourceRef);
const srcB = allShapesMap.get(b.sourceRef?.id || b.sourceRef);
const xA = srcA
? getEffectiveApproachX(srcA, { targetBounds: tgtBounds, obstacles, channelY })
: 0;
const xB = srcB
? getEffectiveApproachX(srcB, { targetBounds: tgtBounds, obstacles, channelY })
: 0;
if (xA !== xB) {
return xA - xB;
}
return (a.id || '').localeCompare(b.id || '');
});
const index = sorted.findIndex((f) => f.id === flow.id);
return tgtBounds.x + Math.round((tgtBounds.width * (index + 1)) / (sorted.length + 1));
}
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