For exmaple, Both Bison and Berkeley Yacc (the new one maintained by T. E. Dickey) support reentrant parsing, which works hand-in-glove with likewise support in GNU Flex.
A parser that whacks around global variables (like parser generated by classic Yacc) is going to be a nonstarter in any modern language which gives programs run-time and compile-time access to the parser (code can execute while parsing and call yyparse). Not to mention if there are threads.
Bison has support for "push parsers" which are state machines called for each token, rather than functions that retain control until they parse an entire unit:
For exmaple, Both Bison and Berkeley Yacc (the new one maintained by T. E. Dickey) support reentrant parsing, which works hand-in-glove with likewise support in GNU Flex.
A parser that whacks around global variables (like parser generated by classic Yacc) is going to be a nonstarter in any modern language which gives programs run-time and compile-time access to the parser (code can execute while parsing and call yyparse). Not to mention if there are threads.
Bison has support for "push parsers" which are state machines called for each token, rather than functions that retain control until they parse an entire unit:
http://www.gnu.org/software/bison/manual/html_node/Push-Decl...