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reserved.go
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reserved.go
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package parser
import (
"fmt"
"github.com/yoheimuta/go-protoparser/internal/lexer/scanner"
"github.com/yoheimuta/go-protoparser/parser/meta"
)
type parseReservedErr struct {
parseRangesErr error
parseFieldNamesErr error
}
func (e *parseReservedErr) Error() string {
return fmt.Sprintf("%v:%v", e.parseRangesErr, e.parseFieldNamesErr)
}
// Range is a range of field numbers. End is an optional value.
type Range struct {
Begin string
End string
}
// Reserved declares a range of field numbers or field names that cannot be used in this message.
// These component Ranges and FieldNames are mutually exclusive.
type Reserved struct {
Ranges []*Range
FieldNames []string
// Comments are the optional ones placed at the beginning.
Comments []*Comment
// InlineComment is the optional one placed at the ending.
InlineComment *Comment
// Meta is the meta information.
Meta meta.Meta
}
// SetInlineComment implements the HasInlineCommentSetter interface.
func (r *Reserved) SetInlineComment(comment *Comment) {
r.InlineComment = comment
}
// Accept dispatches the call to the visitor.
func (r *Reserved) Accept(v Visitor) {
if !v.VisitReserved(r) {
return
}
for _, comment := range r.Comments {
comment.Accept(v)
}
if r.InlineComment != nil {
r.InlineComment.Accept(v)
}
}
// ParseReserved parses the reserved.
// reserved = "reserved" ( ranges | fieldNames ) ";"
//
// See https://developers.google.com/protocol-buffers/docs/reference/proto3-spec#reserved
func (p *Parser) ParseReserved() (*Reserved, error) {
p.lex.NextKeyword()
if p.lex.Token != scanner.TRESERVED {
return nil, p.unexpected("reserved")
}
startPos := p.lex.Pos
parse := func() ([]*Range, []string, error) {
ranges, err := p.parseRanges()
if err == nil {
return ranges, nil, nil
}
fieldNames, ferr := p.parseFieldNames()
if ferr == nil {
return nil, fieldNames, nil
}
return nil, nil, &parseReservedErr{
parseRangesErr: err,
parseFieldNamesErr: ferr,
}
}
ranges, fieldNames, err := parse()
if err != nil {
return nil, err
}
p.lex.Next()
if p.lex.Token != scanner.TSEMICOLON {
return nil, p.unexpected(";")
}
return &Reserved{
Ranges: ranges,
FieldNames: fieldNames,
Meta: meta.NewMeta(startPos),
}, nil
}
// ranges = range { "," range }
// See https://developers.google.com/protocol-buffers/docs/reference/proto3-spec#reserved
func (p *Parser) parseRanges() ([]*Range, error) {
var ranges []*Range
rangeValue, err := p.parseRange()
if err != nil {
return nil, err
}
ranges = append(ranges, rangeValue)
for {
p.lex.Next()
if p.lex.Token != scanner.TCOMMA {
p.lex.UnNext()
break
}
rangeValue, err := p.parseRange()
if err != nil {
return nil, err
}
ranges = append(ranges, rangeValue)
}
return ranges, nil
}
// range = intLit [ "to" ( intLit | "max" ) ]
// See https://developers.google.com/protocol-buffers/docs/reference/proto3-spec#reserved
func (p *Parser) parseRange() (*Range, error) {
p.lex.NextNumberLit()
if p.lex.Token != scanner.TINTLIT {
p.lex.UnNext()
return nil, p.unexpected("intLit")
}
begin := p.lex.Text
p.lex.Next()
if p.lex.Text != "to" {
p.lex.UnNext()
return &Range{
Begin: begin,
}, nil
}
p.lex.NextNumberLit()
switch {
case p.lex.Token == scanner.TINTLIT,
p.lex.Text == "max":
return &Range{
Begin: begin,
End: p.lex.Text,
}, nil
default:
break
}
return nil, p.unexpected(`"intLit | "max"`)
}
// fieldNames = fieldName { "," fieldName }
// See https://developers.google.com/protocol-buffers/docs/reference/proto3-spec#reserved
func (p *Parser) parseFieldNames() ([]string, error) {
var fieldNames []string
fieldName, err := p.parseQuotedFieldName()
if err != nil {
return nil, err
}
fieldNames = append(fieldNames, fieldName)
for {
p.lex.Next()
if p.lex.Token != scanner.TCOMMA {
p.lex.UnNext()
break
}
fieldName, err = p.parseQuotedFieldName()
if err != nil {
return nil, err
}
fieldNames = append(fieldNames, fieldName)
}
return fieldNames, nil
}
// quotedFieldName = quote + fieldName + quote
// TODO: Fixed according to defined documentation. Currently(2018.10.16) the reference lacks the spec.
// See https://github.com/protocolbuffers/protobuf/issues/4558
func (p *Parser) parseQuotedFieldName() (string, error) {
p.lex.NextStrLit()
if p.lex.Token != scanner.TSTRLIT {
p.lex.UnNext()
return "", p.unexpected("quotedFieldName")
}
return p.lex.Text, nil
}