Merge pull request #64 from yoheimuta/fix-option-parse-error/63

Fix option parse error/63

Author: yoheimuta

parser/option.go

@@ -156,6 +156,17 @@ func (p *Parser) parseOptionName() (string, error) {
 		optionName = p.lex.Text
 	case scanner.TLEFTPAREN:
 		optionName = p.lex.Text
+
+		// protoc accepts "(." fullIndent ")". See #63
+		if p.permissive {
+			p.lex.Next()
+			if p.lex.Token == scanner.TDOT {
+				optionName += "."
+			} else {
+				p.lex.UnNext()
+			}
+		}
+
 		fullIdent, _, err := p.lex.ReadFullIdent()
 		if err != nil {
 			return "", err

parser/option_test.go

@@ -242,6 +242,22 @@ body:"*"}]}`,
 				},
 			},
 		},
+		{
+			name:       `parsing "(." fullIdent ")". Fix #63`,
+			input:      `option (.foo.bar.name) = "name";`,
+			permissive: true,
+			wantOption: &parser.Option{
+				OptionName: "(.foo.bar.name)",
+				Constant:   `"name"`,
+				Meta: meta.Meta{
+					Pos: meta.Position{
+						Offset: 0,
+						Line:   1,
+						Column: 1,
+					},
+				},
+			},
+		},
 	}
 
 	for _, test := range tests {