// Copyright 2019 CUE Authors // // Licensed under the Apache License, Version 2.0 (the "License"); // you may not use this file except in compliance with the License. // You may obtain a copy of the License at // // http://www.apache.org/licenses/LICENSE-2.0 // // Unless required by applicable law or agreed to in writing, software // distributed under the License is distributed on an "AS IS" BASIS, // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. // See the License for the specific language governing permissions and // limitations under the License. // Package struct defines utilities for struct types. package structs import ( "cuelang.org/go/cue/errors" "cuelang.org/go/cue/token" "cuelang.org/go/internal/core/adt" "cuelang.org/go/internal/pkg" ) // MinFields validates the minimum number of fields that are part of a struct. // It can only be used as a validator, for instance `MinFields(3)`. // // Only fields that are part of the data model count. This excludes hidden // fields, optional fields, and definitions. func MinFields(object pkg.Struct, n int) (bool, error) { count := object.Len() code := adt.EvalError if object.IsOpen() { code = adt.IncompleteError } if count < n { return false, pkg.ValidationError{B: &adt.Bottom{ Code: code, Err: errors.Newf(token.NoPos, "len(fields) < MinFields(%[2]d) (%[1]d < %[2]d)", count, n), }} } return true, nil } // MaxFields validates the maximum number of fields that are part of a struct. // It can only be used as a validator, for instance `MaxFields(3)`. // // Only fields that are part of the data model count. This excludes hidden // fields, optional fields, and definitions. func MaxFields(object pkg.Struct, n int) (bool, error) { count := object.Len() if count > n { return false, pkg.ValidationError{B: &adt.Bottom{ Code: adt.EvalError, Err: errors.Newf(token.NoPos, "len(fields) > MaxFields(%[2]d) (%[1]d > %[2]d)", count, n), }} } return true, nil }