|keywords not reserved, any guidelines ?? email@example.com (Ann Roddy) (1993-11-11)|
|keywords not reserved, any guidelines ?? firstname.lastname@example.org (James Kanze) (1993-11-12)|
|From:||Ann Roddy <email@example.com>|
|Keywords:||parse, question, comment|
|Date:||Thu, 11 Nov 1993 22:00:10 GMT|
I am looking for any guidelines, papers, or books that cover the lexical
problems associated with languages such as Fortran, PLEX, and PL/I, ie.
languages which do not have keywords as reserved words, thus the lookahead
of such parsers is large.
I have studied a few methods for specific Fortran parsers, but I would
like to know if anything significant has been written on this area ?? Most
books I've read seem to gloss over the topic .
Pls. email to address below,
thanks in advance
Ann Roddy, C.S.I.S Email : firstname.lastname@example.org
University Of Limerick Voice : +353-61-333644 ext 5216
Limerick, Ireland. Fax : +353-61-330876
[It is my impression that all the techniques for parsing context dependent
languages are quite ad hoc. Fortran must be the worst -- you can't even
tell where the token boundaries are until you've prescanned an entire
statement. PL/I is easy enough to tokenize, but the parser has to be able
handle IF IF = THEN; THEN ELSE = IF; ELSE ELSE = THEN; so it needs a lot
of feedback to the lexer to know when to expect a keyword and when to expect
a variable name. -John]
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