Function substituteVariablesFilter

dql/parser.go:548–596

(f *FilterTree, vmap varMap)

}

func substituteVariablesFilter(f *FilterTree, vmap varMap) error {
	if f == nil {
		return nil
	}

	if f.Func != nil {
		if err := substituteVar(f.Func.Attr, &f.Func.Attr, vmap); err != nil {
			return err
		}

		for idx, v := range f.Func.Args {
			if !v.IsDQLVar {
				continue
			}
			if f.Func.Name == uidFunc {
				// This is to support DQL variables in uid functions.
				idVal, ok := vmap[v.Value]
				if !ok {
					return errors.Errorf("Couldn't find value for DQL variable: [%s]", v.Value)
				}
				uids, err := parseID(idVal.Value)
				if err != nil {
					return err
				}
				f.Func.UID = append(f.Func.UID, uids...)
				continue
			}

			if err := substituteVar(v.Value, &f.Func.Args[idx].Value, vmap); err != nil {
				return err
			}

			// We need to parse the regexp after substituting it from a DQL Variable.
			_, ok := vmap[v.Value]
			if f.Func.Name == "regexp" && ok {
				if err := regExpVariableFilter(f.Func, idx); err != nil {
					return err
				}
			}
		}
	}

	for _, fChild := range f.Child {
		if err := substituteVariablesFilter(fChild, vmap); err != nil {
			return err
		}
	}
	return nil
}

// Vars struct contains the list of variables defined and used by a
// query block.