1// Copyright (c) 2017 Ernest Micklei 2// 3// MIT License 4// 5// Permission is hereby granted, free of charge, to any person obtaining 6// a copy of this software and associated documentation files (the 7// "Software"), to deal in the Software without restriction, including 8// without limitation the rights to use, copy, modify, merge, publish, 9// distribute, sublicense, and/or sell copies of the Software, and to 10// permit persons to whom the Software is furnished to do so, subject to 11// the following conditions: 12// 13// The above copyright notice and this permission notice shall be 14// included in all copies or substantial portions of the Software. 15// 16// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, 17// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF 18// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND 19// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE 20// LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION 21// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION 22// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. 23 24package proto 25 26import "text/scanner" 27 28// Reserved statements declare a range of field numbers or field names that cannot be used in a message. 29type Reserved struct { 30 Position scanner.Position 31 Comment *Comment 32 Ranges []Range 33 FieldNames []string 34 InlineComment *Comment 35} 36 37// inlineComment is part of commentInliner. 38func (r *Reserved) inlineComment(c *Comment) { 39 r.InlineComment = c 40} 41 42// Accept dispatches the call to the visitor. 43func (r *Reserved) Accept(v Visitor) { 44 v.VisitReserved(r) 45} 46 47func (r *Reserved) parse(p *Parser) error { 48 for { 49 pos, tok, lit := p.next() 50 if len(lit) == 0 { 51 return p.unexpected(lit, "reserved string or integer", r) 52 } 53 // first char that determined tok 54 ch := []rune(lit)[0] 55 if isDigit(ch) { 56 // use unread here because it could be start of ranges 57 p.nextPut(pos, tok, lit) 58 list, err := parseRanges(p, r) 59 if err != nil { 60 return err 61 } 62 r.Ranges = list 63 continue 64 } 65 if isString(lit) { 66 r.FieldNames = append(r.FieldNames, unQuote(lit)) 67 continue 68 } 69 if tSEMICOLON == tok { 70 p.nextPut(pos, tok, lit) 71 break 72 } 73 } 74 return nil 75} 76