Add Event Gateway rules

index.js

@@ -4,6 +4,7 @@ module.exports = {
       rules: {
         'processmaker/custom-validation': 'error',
         'processmaker/gateway-direction': 'error',
+        'processmaker/event-based-gateway': 'error',
         'processmaker/call-activity-child-process': 'error',
         'processmaker/call-activity-sequence-flow': 'error',
         'processmaker/id-required': 'error',

rules/event-based-gateway.js

@@ -0,0 +1,44 @@
+const { isAny } = require('bpmnlint-utils');
+
+/**
+ * Rule that validates gateways according to the following rules:
+ *
+ *  - An Event Based Gateway can only be connected to events.
+ */
+module.exports = function() {
+  let gateway = null;
+
+  function outgoingFlowsAreValid(gateway) {
+    const outgoing = gateway.get('outgoing');
+    return outgoing.filter(sequenceFlow => {
+      const target = sequenceFlow.get('targetRef');
+      return !isAny(target, ['bpmn:IntermediateCatchEvent', 'bpmn:EndEvent']);
+    }).length === 0;
+  }
+
+  function check(gateway, reporter) {
+    if (!isAny(gateway, ['bpmn:EventBasedGateway'])) {
+      return;
+    }
+
+    const outgoing = gateway.get('outgoing');
+    const valid = outgoing.filter(sequenceFlow => {
+      const target = sequenceFlow.get('targetRef');
+      const isValidType = isAny(target, ['bpmn:IntermediateCatchEvent', 'bpmn:EndEvent']);
+      const onlyOneIncoming = target.get('incoming').length === 1;
+      if (!isValidType) {
+        reporter.report(target.id, 'Event Gateways target elements must be Catch Events');
+      }
+      if (!onlyOneIncoming) {
+        reporter.report(target.id, 'Event Gateway target elements must not have additional incoming Sequence Flows');
+      }
+      return !isValidType || !onlyOneIncoming;
+    }).length === 0;
+
+    if (!valid) {
+      reporter.report(gateway.id, 'Event Gateways target elements must be valid Catch Events');
+    }
+  }
+
+  return { check };
+};