141 lines
3.8 KiB
Go
141 lines
3.8 KiB
Go
// 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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// Oneof is a field alternate.
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type Oneof struct {
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Position scanner.Position
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Comment *Comment
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Name string
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Elements []Visitee
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Parent Visitee
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}
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// addElement is part of elementContainer
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func (o *Oneof) addElement(v Visitee) {
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v.parent(o)
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o.Elements = append(o.Elements, v)
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}
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// elements is part of elementContainer
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func (o *Oneof) elements() []Visitee {
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return o.Elements
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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 (o *Oneof) takeLastComment(expectedOnLine int) (last *Comment) {
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last, o.Elements = takeLastCommentIfEndsOnLine(o.Elements, expectedOnLine)
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return last
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}
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// parse expects:
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// oneofName "{" { oneofField | emptyStatement } "}"
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func (o *Oneof) parse(p *Parser) error {
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pos, 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, "oneof identifier", o)
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}
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}
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o.Name = lit
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pos, tok, lit = p.next()
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if tok != tLEFTCURLY {
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return p.unexpected(lit, "oneof opening {", o)
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}
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for {
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pos, tok, lit = p.nextTypeName()
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switch tok {
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case tCOMMENT:
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if com := mergeOrReturnComment(o.elements(), lit, pos); com != nil { // not merged?
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o.addElement(com)
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}
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case tIDENT:
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f := newOneOfField()
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f.Position = pos
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f.Comment, o.Elements = takeLastCommentIfEndsOnLine(o.elements(), pos.Line-1) // TODO call takeLastComment instead?
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f.Type = lit
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if err := parseFieldAfterType(f.Field, p); err != nil {
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return err
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}
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o.addElement(f)
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case tGROUP:
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g := new(Group)
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g.Position = pos
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g.Comment, o.Elements = takeLastCommentIfEndsOnLine(o.elements(), pos.Line-1)
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if err := g.parse(p); err != nil {
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return err
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}
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o.addElement(g)
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case tOPTION:
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opt := new(Option)
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opt.Position = pos
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opt.Comment, o.Elements = takeLastCommentIfEndsOnLine(o.elements(), pos.Line-1)
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if err := opt.parse(p); err != nil {
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return err
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}
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o.addElement(opt)
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case tSEMICOLON:
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maybeScanInlineComment(p, o)
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// continue
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default:
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goto done
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}
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}
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done:
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if tok != tRIGHTCURLY {
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return p.unexpected(lit, "oneof closing }", o)
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}
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return nil
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}
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// Accept dispatches the call to the visitor.
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func (o *Oneof) Accept(v Visitor) {
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v.VisitOneof(o)
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}
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// OneOfField is part of Oneof.
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type OneOfField struct {
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*Field
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}
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func newOneOfField() *OneOfField { return &OneOfField{Field: new(Field)} }
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// Accept dispatches the call to the visitor.
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func (o *OneOfField) Accept(v Visitor) {
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v.VisitOneofField(o)
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}
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// Doc is part of Documented
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// Note: although Doc() is defined on Field, it must be implemented here as well.
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func (o *OneOfField) Doc() *Comment {
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return o.Comment
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}
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func (o *Oneof) parent(v Visitee) { o.Parent = v }
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