Function AR_PROPERTY

src/arithmetic/entity_funcs/entity_funcs.c:241–295

}

SIValue AR_PROPERTY(SIValue *argv, int argc, void *private_data) {
	// return NULL for missing graph entity
	if(SI_TYPE(argv[0]) == T_NULL) return SI_NullVal();

	// AR_PROPERTY may be invoked from AR_SUBSCRIPT in a case like:
	// WITH {val: 5} AS map RETURN map["val"]
	// As such, we need to validate the argument's type independently of the invocation validation.
	if(SI_TYPE(argv[1]) != T_STRING) {
		// String indexes are only permitted on maps, not arrays.
		Error_SITypeMismatch(argv[1], T_STRING);
		return SI_NullVal();
	}

	// inputs:
	// argv[0] - node/edge/map/point
	// argv[1] - property string
	// argv[2] - property index

	//--------------------------------------------------------------------------
	// Process inputs
	//--------------------------------------------------------------------------

	SIValue obj = argv[0];
	if(SI_TYPE(obj) & SI_GRAPHENTITY) {
		// retrieve entity property
		GraphEntity *graph_entity = (GraphEntity *)obj.ptrval;
		const char *prop_name     = argv[1].stringval;
		Attribute_ID prop_idx     = argv[2].longval;

		// We have the property string, attempt to look up the index now.
		if(prop_idx == ATTRIBUTE_ID_NONE) {
			GraphContext *gc = QueryCtx_GetGraphCtx();
			prop_idx = GraphContext_GetAttributeID(gc, prop_name);
		}

		// Retrieve the property.
		SIValue *value = GraphEntity_GetProperty(graph_entity, prop_idx);
		return SI_ConstValue(value);
	} else if(SI_TYPE(obj) & T_MAP) {
		// retrieve map key
		SIValue key = argv[1];
		SIValue value;

		Map_Get(obj, key, &value);
		// Return a volatile copy of the value, as it may be heap-allocated.
		return SI_ShareValue(value);
	} else if(SI_TYPE(obj) & T_POINT) {
		// retrieve property key 
		SIValue key = argv[1];
		return Point_GetCoordinate(obj, key);
	} else {
		// unexpected type SI_TYPE(obj)
		return SI_NullVal();
	}
}

SIValue AR_TYPEOF(SIValue *argv, int argc, void *private_data) {
	return SI_ConstStringVal(SIType_ToString(SI_TYPE(argv[0])));