golang parser crashes with java.lang.ArrayIndexOutOfBoundsException

[andrewstein]

I am using the golang/GoLexer.g4, golang/GoParser.g4 and golang/Java/GoParserBase.java with the following code snippet:

        import ("..")

The GoParser::importDecl method crashes with the following stack trace:

java.lang.ArrayIndexOutOfBoundsException: Index -1 out of bounds for length 0

	at org.antlr.parser.golang.GoParserBase.addImportSpec(GoParserBase.java:66)
	at org.antlr.parser.golang.GoParser.importSpec(GoParser.java:549)
	at org.antlr.parser.golang.GoParser.importDecl(GoParser.java:471)

[andrewstein]

The line that is problematic in GoParserBase.java is

            String fileName = fileArr[fileArr.length - 1];

where the fileArr is empty.

[kaby76]

I fixed the base classes for the grammar to handle all possible types of "import" statements. The example is still illegal because there's no "package" statement. #4736