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	Parent        Visitee
36}
37
38// inlineComment is part of commentInliner.
39func (r *Reserved) inlineComment(c *Comment) {
40	r.InlineComment = c
41}
42
43// Accept dispatches the call to the visitor.
44func (r *Reserved) Accept(v Visitor) {
45	v.VisitReserved(r)
46}
47
48func (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) {
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
79func (r *Reserved) parent(v Visitee) { r.Parent = v }
80