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 24 package proto 25 26 import "text/scanner" 27 28 // Reserved statements declare a range of field numbers or field names that cannot be used in a message. 29 type Reserved struct { 30 Position scanner.Position 31 Comment *Comment 32 Ranges []Range 33 FieldNames []string 34 InlineComment *Comment 35 Parent Visitee 36 } 37 38 // inlineComment is part of commentInliner. 39 func (r *Reserved) inlineComment(c *Comment) { 40 r.InlineComment = c 41 } 42 43 // Accept dispatches the call to the visitor. 44 func (r *Reserved) Accept(v Visitor) { 45 v.VisitReserved(r) 46 } 47 48 func (r *Reserved) parse(p *Parser) error { 49 for { 50 pos, tok, lit := p.next() 51 if len(lit) == 0 { 52 return p.unexpected(lit, "reserved string or integer", r) 53 } 54 // first char that determined tok 55 ch := []rune(lit)[0] 56 if isDigit(ch) || ch == '-' { 57 // use unread here because it could be start of ranges 58 p.nextPut(pos, tok, lit) 59 list, err := parseRanges(p, r) 60 if err != nil { 61 return err 62 } 63 r.Ranges = list 64 continue 65 } 66 if isString(lit) { 67 s, _ := unQuote(lit) 68 r.FieldNames = append(r.FieldNames, s) 69 continue 70 } 71 if tSEMICOLON == tok { 72 p.nextPut(pos, tok, lit) 73 break 74 } 75 } 76 return nil 77 } 78 79 func (r *Reserved) parent(v Visitee) { r.Parent = v } 80