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