100 lines
2.8 KiB
Go
100 lines
2.8 KiB
Go
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// Copyright (c) 2017 Ernest Micklei
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//
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// MIT License
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//
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// Permission is hereby granted, free of charge, to any person obtaining
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// a copy of this software and associated documentation files (the
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// "Software"), to deal in the Software without restriction, including
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// without limitation the rights to use, copy, modify, merge, publish,
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// distribute, sublicense, and/or sell copies of the Software, and to
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// permit persons to whom the Software is furnished to do so, subject to
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// the following conditions:
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//
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// The above copyright notice and this permission notice shall be
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// included in all copies or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
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// LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
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// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
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// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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package proto
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import (
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"text/scanner"
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)
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// Group represents a (proto2 only) group.
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// https://developers.google.com/protocol-buffers/docs/reference/proto2-spec#group_field
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type Group struct {
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Position scanner.Position
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Comment *Comment
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Name string
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Optional bool
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Repeated bool
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Required bool
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Sequence int
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Elements []Visitee
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Parent Visitee
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}
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// Accept dispatches the call to the visitor.
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func (g *Group) Accept(v Visitor) {
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v.VisitGroup(g)
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}
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// addElement is part of elementContainer
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func (g *Group) addElement(v Visitee) {
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v.parent(g)
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g.Elements = append(g.Elements, v)
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}
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// elements is part of elementContainer
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func (g *Group) elements() []Visitee {
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return g.Elements
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}
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// Doc is part of Documented
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func (g *Group) Doc() *Comment {
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return g.Comment
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}
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// takeLastComment is part of elementContainer
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// removes and returns the last element of the list if it is a Comment.
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func (g *Group) takeLastComment(expectedOnLine int) (last *Comment) {
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last, g.Elements = takeLastCommentIfEndsOnLine(g.Elements, expectedOnLine)
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return
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}
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// parse expects:
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// groupName "=" fieldNumber { messageBody }
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func (g *Group) parse(p *Parser) (err error) {
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_, tok, lit := p.next()
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if tok != tIDENT {
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if !isKeyword(tok) {
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return p.unexpected(lit, "group name", g)
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}
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}
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g.Name = lit
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_, tok, lit = p.next()
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if tok != tEQUALS {
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return p.unexpected(lit, "group =", g)
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}
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var i int
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if i, err = p.nextInteger(); err != nil {
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return p.unexpected(lit, "group sequence number", g)
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}
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g.Sequence = i
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_, tok, lit = p.next()
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if tok != tLEFTCURLY {
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return p.unexpected(lit, "group opening {", g)
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}
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return parseMessageBody(p, g)
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}
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func (g *Group) parent(v Visitee) { g.Parent = v }
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