func curs(pairs ...interface{}) queryCursor {
if len(pairs)%2 != 0 {
panic("curs() takes only even pairs")
}
pre := &bytes.Buffer{}
if _, err := cmpbin.WriteUint(pre, uint64(len(pairs)/2)); err != nil {
panic(err)
}
post := serialize.Invertible(&bytes.Buffer{})
for i := 0; i < len(pairs); i += 2 {
k, v := pairs[i].(string), pairs[i+1]
col, err := dstore.ParseIndexColumn(k)
if err != nil {
panic(err)
}
post.SetInvert(col.Descending)
if err := serialize.WriteIndexColumn(pre, col); err != nil {
panic(err)
}
if err := serialize.WriteProperty(post, serialize.WithoutContext, prop(v)); err != nil {
panic(err)
}
}
return queryCursor(serialize.Join(pre.Bytes(), post.Bytes()))
}
func indx(kind string, orders ...string) *ds.IndexDefinition {
ancestor := false
if kind[len(kind)-1] == '!' {
ancestor = true
kind = kind[:len(kind)-1]
}
ret := &ds.IndexDefinition{Kind: kind, Ancestor: ancestor}
for _, o := range orders {
col, err := ds.ParseIndexColumn(o)
if err != nil {
panic(err)
}
ret.SortBy = append(ret.SortBy, col)
}
return ret
}