$ symbol is not escaped properly in generated code

[MartinHaeusler]

I'm trying to build a parser for MongoDB query expressions. The corresponding grammar has a lot of terminals which start with $, e.g.:

• $eq
• $and
• $not
• etc.

The problem is that the kotlin code generator does not escape those $ symbols properly. For example, in the generated lexer file, the LITERAL_NAMES contains:

"'\"$and\"'"

... which of course translates to a template expression in Kotlin that inserts the value of the variable and into the string. This is clearly not what we want. The proper escaping would be:

"\"${'$'}and\""