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// Copyright (c) 2017 Ernest Micklei
//
// MIT License
//
// Permission is hereby granted, free of charge, to any person obtaining
// a copy of this software and associated documentation files (the
// "Software"), to deal in the Software without restriction, including
// without limitation the rights to use, copy, modify, merge, publish,
// distribute, sublicense, and/or sell copies of the Software, and to
// permit persons to whom the Software is furnished to do so, subject to
// the following conditions:
//
// The above copyright notice and this permission notice shall be
// included in all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
// LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
package proto
import (
"text/scanner"
)
// Service defines a set of RPC calls.
type Service struct {
Position scanner.Position
Comment *Comment
Name string
Elements []Visitee
Parent Visitee
}
// Accept dispatches the call to the visitor.
func (s *Service) Accept(v Visitor) {
v.VisitService(s)
}
// Doc is part of Documented
func (s *Service) Doc() *Comment {
return s.Comment
}
// addElement is part of elementContainer
func (s *Service) addElement(v Visitee) {
v.parent(s)
s.Elements = append(s.Elements, v)
}
// elements is part of elementContainer
func (s *Service) elements() []Visitee {
return s.Elements
}
// takeLastComment is part of elementContainer
// removes and returns the last elements of the list if it is a Comment.
func (s *Service) takeLastComment(expectedOnLine int) (last *Comment) {
last, s.Elements = takeLastCommentIfEndsOnLine(s.Elements, expectedOnLine)
return
}
// parse continues after reading "service"
func (s *Service) parse(p *Parser) error {
pos, tok, lit := p.nextIdentifier()
if tok != tIDENT {
if !isKeyword(tok) {
return p.unexpected(lit, "service identifier", s)
}
}
s.Name = lit
pos, tok, lit = p.next()
if tok != tLEFTCURLY {
return p.unexpected(lit, "service opening {", s)
}
for {
pos, tok, lit = p.next()
switch tok {
case tCOMMENT:
if com := mergeOrReturnComment(s.Elements, lit, pos); com != nil { // not merged?
s.addElement(com)
}
case tOPTION:
opt := new(Option)
opt.Position = pos
opt.Comment, s.Elements = takeLastCommentIfEndsOnLine(s.elements(), pos.Line-1)
if err := opt.parse(p); err != nil {
return err
}
s.addElement(opt)
case tRPC:
rpc := new(RPC)
rpc.Position = pos
rpc.Comment, s.Elements = takeLastCommentIfEndsOnLine(s.Elements, pos.Line-1)
err := rpc.parse(p)
if err != nil {
return err
}
s.addElement(rpc)
maybeScanInlineComment(p, s)
case tSEMICOLON:
maybeScanInlineComment(p, s)
case tRIGHTCURLY:
goto done
default:
return p.unexpected(lit, "service comment|rpc", s)
}
}
done:
return nil
}
func (s *Service) parent(v Visitee) { s.Parent = v }
// RPC represents an rpc entry in a message.
type RPC struct {
Position scanner.Position
Comment *Comment
Name string
RequestType string
StreamsRequest bool
ReturnsType string
StreamsReturns bool
Elements []Visitee
InlineComment *Comment
Parent Visitee
// Options field is DEPRECATED, use Elements instead.
Options []*Option
}
// Accept dispatches the call to the visitor.
func (r *RPC) Accept(v Visitor) {
v.VisitRPC(r)
}
// Doc is part of Documented
func (r *RPC) Doc() *Comment {
return r.Comment
}
// inlineComment is part of commentInliner.
func (r *RPC) inlineComment(c *Comment) {
r.InlineComment = c
}
// parse continues after reading "rpc"
func (r *RPC) parse(p *Parser) error {
pos, tok, lit := p.next()
if tok != tIDENT {
return p.unexpected(lit, "rpc method", r)
}
r.Name = lit
pos, tok, lit = p.next()
if tok != tLEFTPAREN {
return p.unexpected(lit, "rpc type opening (", r)
}
pos, tok, lit = p.nextIdentifier()
if tSTREAM == tok {
r.StreamsRequest = true
pos, tok, lit = p.nextIdentifier()
}
if tok != tIDENT {
return p.unexpected(lit, "rpc stream | request type", r)
}
r.RequestType = lit
pos, tok, lit = p.next()
if tok != tRIGHTPAREN {
return p.unexpected(lit, "rpc type closing )", r)
}
pos, tok, lit = p.next()
if tok != tRETURNS {
return p.unexpected(lit, "rpc returns", r)
}
pos, tok, lit = p.next()
if tok != tLEFTPAREN {
return p.unexpected(lit, "rpc type opening (", r)
}
pos, tok, lit = p.nextIdentifier()
if tSTREAM == tok {
r.StreamsReturns = true
pos, tok, lit = p.nextIdentifier()
}
if tok != tIDENT {
return p.unexpected(lit, "rpc stream | returns type", r)
}
r.ReturnsType = lit
pos, tok, lit = p.next()
if tok != tRIGHTPAREN {
return p.unexpected(lit, "rpc type closing )", r)
}
pos, tok, lit = p.next()
if tSEMICOLON == tok {
p.nextPut(pos, tok, lit) // allow for inline comment parsing
return nil
}
if tLEFTCURLY == tok {
// parse options
for {
pos, tok, lit = p.next()
if tRIGHTCURLY == tok {
break
}
if isComment(lit) {
if com := mergeOrReturnComment(r.elements(), lit, pos); com != nil { // not merged?
r.addElement(com)
continue
}
}
if tSEMICOLON == tok {
maybeScanInlineComment(p, r)
continue
}
if tOPTION == tok {
o := new(Option)
o.Position = pos
if err := o.parse(p); err != nil {
return err
}
r.addElement(o)
}
}
}
return nil
}
// addElement is part of elementContainer
func (r *RPC) addElement(v Visitee) {
v.parent(r)
r.Elements = append(r.Elements, v)
// handle deprecated field
if option, ok := v.(*Option); ok {
r.Options = append(r.Options, option)
}
}
// elements is part of elementContainer
func (r *RPC) elements() []Visitee {
return r.Elements
}
func (r *RPC) takeLastComment(expectedOnLine int) (last *Comment) {
last, r.Elements = takeLastCommentIfEndsOnLine(r.Elements, expectedOnLine)
return
}
func (r *RPC) parent(v Visitee) { r.Parent = v }
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