4 Dec
2018
4 Dec
'18
2:55 a.m.
Your message dated: Mon, 03 Dec 2018 15:10:32 -0500
--------
On 12/3/18, Ron Young <rly1(a)embarqmail.com>
wrote:
not sure... I'll check when I get home.
John Levine wrote a ftn77 subset parser using lex and yacc (the shar
file that I have is dated Nov 1988).
Just curious--what parts of Fortran 77 did he leave out?
Yes, full Fortran can be expressed in BNF and other formal syntax
mechanisms. But I don't think you can use lex and yacc to generate a
compiler for it.
agreed... but if you use Sale's classifier, you can insert
whitespace to convert the input to something that lex/yacc can
handle. Although in practice, using a hand-written lexer or
a state machine (like open-watcom IIRC) would probably be the
way to go.
-ron
-Paul W.
===============================================================================
Ron Young rly1(a)embarqmail.com