Hi Simon, > Le 1 janv. 2019 à 23:19, Simon Richter <simon.rich...@hogyros.de> a écrit : > > Hi, > > I'm wondering what would be the best way to communicate from the lexer > to the parser that the lexer detected something it could not tokenize > (in my case, characters outside the allowed character set). > > In this case, it is fairly obvious that we want to abort, without a call > to yyerror, but properly destructing and deallocating any values still > on the stack. > > The best way I can think of at the moment would be to define an > additional token type that isn't used in any rule, return that from the > lexer, and create a shortcut between lexer and parser that silences yyerror.
Bison 3.6 will offer a means to do this: returning YYerror from the scanner. Please, have a look at this commit: https://lists.gnu.org/r/bison-patches/2020-04/msg00180.html and give a try to this beta: https://lists.gnu.org/r/bison-patches/2020-04/msg00181.html Cheers!
