field.isAllowed = function()

in modules/ui/field.js [311:352]

• 34 lines of code
• 20 McCabe index (conditional complexity)

    field.isAllowed = function() {

        if (entityIDs &&
            entityIDs.length > 1 &&
            uiFields[field.type].supportsMultiselection === false) return false;

        if (field.geometry && !entityIDs.every(function(entityID) {
            return field.matchGeometry(context.graph().geometry(entityID));
        })) return false;

        if (entityIDs && _entityExtent && field.locationSetID) {   // is field allowed in this location?
            var validLocations = locationManager.locationsAt(_entityExtent.center());
            if (!validLocations[field.locationSetID]) return false;
        }

        var prerequisiteTag = field.prerequisiteTag;

        if (entityIDs &&
            !tagsContainFieldKey() && // ignore tagging prerequisites if a value is already present
            prerequisiteTag) {

            if (!entityIDs.every(function(entityID) {
                var entity = context.graph().entity(entityID);
                if (prerequisiteTag.key) {
                    var value = entity.tags[prerequisiteTag.key];
                    if (!value) return false;

                    if (prerequisiteTag.valueNot) {
                        return prerequisiteTag.valueNot !== value;
                    }
                    if (prerequisiteTag.value) {
                        return prerequisiteTag.value === value;
                    }
                } else if (prerequisiteTag.keyNot) {
                    if (entity.tags[prerequisiteTag.keyNot]) return false;
                }
                return true;
            })) return false;
        }

        return true;
    };