| // Copyright 2014 Google Inc. All rights reserved. |
| // |
| // 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 parser |
| |
| import "fmt" |
| |
| func AddStringToList(list *List, s string) (modified bool) { |
| for _, v := range list.Values { |
| if v.Type() != StringType { |
| panic(fmt.Errorf("expected string in list, got %s", v.Type())) |
| } |
| |
| if sv, ok := v.(*String); ok && sv.Value == s { |
| // string already exists |
| return false |
| } |
| } |
| |
| list.Values = append(list.Values, &String{ |
| LiteralPos: list.RBracePos, |
| Value: s, |
| }) |
| |
| return true |
| } |
| |
| func RemoveStringFromList(list *List, s string) (modified bool) { |
| for i, v := range list.Values { |
| if v.Type() != StringType { |
| panic(fmt.Errorf("expected string in list, got %s", v.Type())) |
| } |
| |
| if sv, ok := v.(*String); ok && sv.Value == s { |
| list.Values = append(list.Values[:i], list.Values[i+1:]...) |
| return true |
| } |
| } |
| |
| return false |
| } |