public item()

in tsc/src/common/graph.ts [450:512]
62 lines of code
14 McCabe index (conditional complexity)

	public item(from: DeclarationResult | DefinitionResult | TypeDefinitionResult | ReferenceResult | ImplementationResult, to: Vertex[], shard: Document | Project, property?: ItemEdgeProperties.declarations | ItemEdgeProperties.definitions | ItemEdgeProperties.references): item {
		if (to.length === 0) {
			const result: item = {
				id: this.nextId(),
				type: ElementTypes.edge,
				label: EdgeLabels.item,
				outV: from.id,
				inVs: [],
				shard: shard.id
			};
			// We have an empty to array. So treat the empty set as references or use the property provided.
			if (from.label === 'referenceResult') {
				result.property = property !== undefined ? property : ItemEdgeProperties.references;
			}
			return result;
		}
		const toKind = to[0].label;
		const result: item = {
			id: this.nextId(),
			type: ElementTypes.edge,
			label: EdgeLabels.item,
			outV: from.id,
			inVs: to.map(v => v.id),
			shard: shard.id
		};
		switch (from.label) {
			case 'declarationResult':
				break;
			case 'definitionResult':
				break;
			case 'referenceResult':
				switch (toKind) {
					case VertexLabels.range:
						if (property === undefined) {
							throw new Error(`An item edge pointing to ranges needs to define a property.`);
						}
						result.property = property;
						break;
					case VertexLabels.referenceResult:
						result.property = ItemEdgeProperties.referenceResults;
						break;
					case VertexLabels.moniker:
						result.property = ItemEdgeProperties.referenceLinks;
						break;
					default:
						throw new Error('Should never happen.');
				}
				break;
			case 'implementationResult':
				switch (toKind) {
					case VertexLabels.implementationResult:
						result.property = ItemEdgeProperties.implementationResults;
						break;
					case VertexLabels.moniker:
						result.property = ItemEdgeProperties.implementationLinks;
						break;
				}
				break;
			default:
				throw new Error('Shouldn\'t happen');
		}
		return result;
	}