hello everyone,
i had been trying to make a lexical analyzer for c, where all the keywords were to be inputted in a text file keywords. this i stored in an array. but this process is not being automated. the code i wrote is as follows :-
#!/usr/bin/env perl
@keywd=`cat /home/vikash/maya/keywords`;
@operatr=`cat /home/vikash/maya/operators`;
print "<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
+>";
foreach $keyword (@keywd){print "$keyword";}
print "<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
+>";
print "\nthe total no. of keywords specified in the file are :($#keywd
+)\n";
print "hello $ENV{'USER'}, greetings !!! you are ";
print "using display $ENV{'DISPLAY'} \n";
$file='/home/vikash/maya/new.c';
print "\n\n:Lexical Analysis Report:\n\n";
print " |-> Input Code File:- $file\n";
print <<"EOF";
\nThe code used in the lexical analysis is :- \n
EOF
print `cat /home/vikash/maya/new.c`;
for($i=0;$i<$#keywd;$i++)
{
print if /\b^int$\b/;
}
__END__
the keywords file contains:-
auto
continue
enum
if
short
break
switch
volatile
default
extern
int
signed
typedef
while
case
do
float
long
sizeof
union
char
double
for
register
static
unsigned
const
else
goto
return
struct
void
the problem i'm having is that the keywords are not being taken automatically one after the another from this list of keywords.............
if i do
open(INFO,$file);
while(<INFO>){
print if /\bint\b/;
print if /\bfloat\b/;
}
close(INFO)
everything's fine........
but i don't want to enter all these keywords one by one. what if in future i were to add a new keyword. i would simply like to modify the keywords file not the whole code........
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