how to use lrlex with rust code

[RickSKy]

• we can use c code, and c context with flex, just like below

struct comile_context ctx;
int test_compile() {
     struct comile_store store;
     
     yaccparse(&store);
}

this c code is with yacc export function yaccparse. and yacc 's param is a pointer for struct comile_store .
ctx is global context, or we can also say that it is a global var for yacc.
and in .l file, we can use c code with ctx :

%{
extern struct comile_context ctx;
%}
%%
testsymbol    {
                               do somthing with ctx. 
                               for example, store the count of testsymbol at ctx,
                               for example, get some sub strings from yytext, then store them at ctx.
                       }

if there are two testsymbol in input, the c code in {} will execute twice.
there are two problem metioned:

• how to write rust code with lrlex
• how to get yytext in .l with lrlex

[ltratt]

lrlex is currently much simpler than flex and can't execute user code (in part because, in my opinion, trying to make an automatic lexer too flexible makes it ever-more complex, without making it much more flexible).

Instead, if you need a highly flexible lexer, you can use the advice at https://softdevteam.github.io/grmtools/master/book/manuallexer.html to write your own manual lexer whose output is then parsed by lrpar.