Incorrect Result When ANTLR4 Lexer Action Invokes getText() -

it seems gettext() in lexer action cannot retrieve token being matched correctly. normal behaviour? example, part of grammar has these rules parsing c++ style identifier support \u sequence embed unicode characters part of identifier name:

grammar cppdefine; cppcompilationunit: (id_token|all_other_symbol)+ eof; id_token:identifier //{system.out.println($text);} ; crlf: '\r'? '\n' -> skip;  all_other_symbol: '\\'; identifier: (nondigit (nondigit | digit)*)    {system.out.println(gettext());} ; fragment digit: [0-9]; fragment nondigit: [_a-za-z]  | universal_character_name ; fragment universal_character_name: ('\\u' hex_quad  | '\\u' hex_quad hex_quad ) ; fragment hex_quad: [0-9a-fa-f] [0-9a-fa-f] [0-9a-fa-f] [0-9a-fa-f]; 

tested 1 line input containing identifier incorrect unicode escape sequence:

dkk\uzzzz 

the $text of id_token parser rule action produces correct result:

dkk uzzzz 

i.e. input interpreted 2 identifiers separated symbol '\' (symbol '\' not printed parser rule).

however, gettext() of identifier lexer rule action produces incorrect result:

dkk\u uzzzz 

why lexer rule identifier's gettext() different parser id_token rule's $text. afterall, parser rule contains lexer rule?

edit:

issue observed in antlr4.1 not in antlr4.2 have been fixed already.

it's hard tell based on example, instinct using old version of antlr. unable reproduce issue in antlr 4.2.