// collectionPrefix recursively digs down through collection rules, recursively
// calling itself as long as it finds a collection rule (map or array). It returns
// the full collection prefix (e.g. any number of appended [] and map[string]'s)
// and the inner (non collection) rule.
func collectionPrefixInnerRule(ctx context.Context, prefix string, outer *system.RuleWrapper) (fullPrefix string, inner *system.RuleWrapper, err error) {
kind, alias := outer.Kind(ctx)
if alias {
return prefix, outer, nil
}
switch kind {
case system.KindValue, system.KindStruct, system.KindInterface:
return prefix, outer, nil
case system.KindArray:
prefix += "[]"
case system.KindMap:
prefix += "map[string]"
default:
panic("unknown kind")
}
items, err := outer.ItemsRule()
if err != nil {
return "", nil, kerr.Wrap("SUTYJEGBKW", err)
}
return collectionPrefixInnerRule(ctx, prefix, items)
}
