How can we write multiple parsers to use the same lexer?

[rojares]

Looking at class org.antlr.v4.gui.TestRig method process() starting at line 123 I noticed that Lexer classname has to be the same as parser classname.
line 125: String lexerName = grammarName+"Lexer";
How is it possible to use multiple different parsers to use the same lexer?

[rojares]

I just realized that

• When I generate a lexer from a lexer grammar then org.antlr.v4.Tool generates a lexer with classname grammarName.
• When I generate a parser from a parser grammar then org.antlr.v4.Tool generates a parser with classname grammarName.
• When I generate a parser from a generic grammar (both lexer and parser) then org.antlr.v4.Tool generates a lexer with classname grammarName+"Lexer" and parser with grammarName+"Lexer".
  So there is a tight coupling with the lexer classname and parser classname.
  This is problematic when trying to generate one lexer for multiple grammars.
  I also feel that this coupling is weakly documented.