How to parse C-programs without communication between parser and lexer

Hello,


Thursday August 15 1996, Detlef Sodtke writes to All:


> The main problem is to distinguish the typedefnames from the normal
> identifiers. The common way is, that the parser writes in a hashtable the
> typedefnames and the lexer reads from it.


I introduce an additional layer:


token_t *get_token() {
    token_t *t = get_token_from_lex();
    if ( is_typedef(t) ) return convert_to_typedef(t);
    else return t;
}


The parser calls 'get_token' function and gets a 'typedef' token when
there is one.
get_token_from_lex() simply returns a typedef name as an identifier.


> In our implementation we can't do it this way. We have to lex the whole
> C-program before the parser starts to work. So the parser is not able to
> write in a hashtable.


The lexer can be run as a separate pass.


bye
Ilfak
--

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