Mike.McManus@FtCollins.NCR.com (Mike McManus) (09/12/90)
I'm reading tokens in from a file and doing compares on the token, sort of
like:
@toklist = ("VDD", "GND", IN", "OUT", "INOUT");
while(<>) {
if( do IS_TERM()) {
...
}
}
sub IS_TERM() {
$token = (split)[1];
if( join( " ", @tklist) !~ /$token/) {return(0);}
foreach $i (@toklist) {
if( $i eq $token) {
....
return(1);
}
}
return(0);
}
# Warning! Not the REAL perl code, but a resonable facsimile thereof...
The problem I run into is when $token is something containg a meta character.
Specifically, things die when $token = "IF(". Anybody got any ideas about a
work around? I tried some things, but am a green enuff novice that I didn't
have much luck.
NOTE: I use the 'if(join...) return 0' as a quick and dirty check, before
launching into a 'foreach $i (@toklist)', so as to save time. Will it, can
forget about it. This would solve my problem, too.
Thanks!
--
Disclaimer: All spelling and/or grammar in this document are guaranteed to be
correct; any exseptions is the is wurk uv intter-net deemuns,.
Mike McManus Mike.McManus@FtCollins.NCR.COM, or
NCR Microelectronics ncr-mpd!mikemc@ncr-sd.sandiego.ncr.com, or
2001 Danfield Ct. uunet!ncrlnk!ncr-mpd!garage!mikemc
Ft. Collins, Colorado
(303) 223-5100 Ext. 378
Mike.McManus@FtCollins.NCR.com (Mike McManus) (09/12/90)
In article <MIKE.MCMANUS.90Sep12091652@mustang.FtCollins.NCR.com> Mike.McManus@FtCollins.NCR.com (Mike McManus) writes: > I'm reading tokens in from a file and doing compares on the token, sort of > like: ... > The problem I run into is when $token is something containg a meta character. > Specifically, things die when $token = "IF(". Anybody got any ideas about a > work around? I tried some things, but am a green enuff novice that I didn't > have much luck. I am having similar problems when comparing tokens that contain other meta characters (such as brackets). Right now, I am using a rather kludgy work around, ala: $a = "row[4].gndbus"; $b = "row[4]"; $b =~ s/([\.\[\]\(\)])/\\\1/g; if( $a =~ /$b/) { ... } This seems to work, but it (1) changes $b, and (2) is fairly clumsy. I'm looking for better solutions! Something elegent would be nice, such as: if( $a =~ /$b/l) { ... } where the "l" operator would denote that $b should be taken as a literal (assume meta characters are literal instead, equiv. to \x). Isn't this kind of what the "e" operator does for substitute? Perl didn't like it when I tried it here! So throw me some ideas, I'm all ears! -- Disclaimer: All spelling and/or grammar in this document are guaranteed to be correct; any exseptions is the is wurk uv intter-net deemuns,. Mike McManus Mike.McManus@FtCollins.NCR.COM, or NCR Microelectronics ncr-mpd!mikemc@ncr-sd.sandiego.ncr.com, or 2001 Danfield Ct. uunet!ncrlnk!ncr-mpd!garage!mikemc Ft. Collins, Colorado (303) 223-5100 Ext. 378
merlyn@iwarp.intel.com (Randal Schwartz) (09/13/90)
In article <MIKE.MCMANUS.90Sep12091652@mustang.FtCollins.NCR.com>, Mike.McManus@FtCollins (Mike McManus) writes: | | I'm reading tokens in from a file and doing compares on the token, sort of | like: | | @toklist = ("VDD", "GND", IN", "OUT", "INOUT"); | | while(<>) { | if( do IS_TERM()) { | ... | } | } | | sub IS_TERM() { | $token = (split)[1]; | if( join( " ", @tklist) !~ /$token/) {return(0);} | foreach $i (@toklist) { | if( $i eq $token) { | .... | return(1); | } | } | return(0); | } Shoot. You're doin' it the hard way. Give the task to Perl in the form of a regex that matches *everything* you wanna lookfor in one fell swoop... ################################################## snip here @toklist = ("VDD", "GND", "IN", "OUT", "INOUT"); grep(s/\W/\\\&/g,@toklist); # de magic-ize toklist eval 'sub is_token { $_[0] =~ /(' . join('|',@toklist) . ')/; }'; # add ^ and $ here if you want anchored matches (I think you do) #testing one two three... for ('aaa','bbb','VDD','ccc','ddd') { print "$_ ", &is_token($_) ? "IS" : "isn't", " a token\n"; } ################################################## snip There. OK? print "Just another token Perl hacker," # :-) -- /=Randal L. Schwartz, Stonehenge Consulting Services (503)777-0095 ==========\ | on contract to Intel's iWarp project, Beaverton, Oregon, USA, Sol III | | merlyn@iwarp.intel.com ...!any-MX-mailer-like-uunet!iwarp.intel.com!merlyn | \=Cute Quote: "Welcome to Portland, Oregon, home of the California Raisins!"=/
lwall@jpl-devvax.JPL.NASA.GOV (Larry Wall) (09/13/90)
In article <MIKE.MCMANUS.90Sep12091652@mustang.FtCollins.NCR.com> Mike.McManus@FtCollins.NCR.com (Mike McManus) writes: : : I'm reading tokens in from a file and doing compares on the token, sort of : like: : : @toklist = ("VDD", "GND", IN", "OUT", "INOUT"); : : while(<>) { : if( do IS_TERM()) { : ... : } : } : : sub IS_TERM() { : $token = (split)[1]; : if( join( " ", @tklist) !~ /$token/) {return(0);} : foreach $i (@toklist) { : if( $i eq $token) { : .... : return(1); : } : } : return(0); : } : : # Warning! Not the REAL perl code, but a resonable facsimile thereof... : : The problem I run into is when $token is something containg a meta character. : Specifically, things die when $token = "IF(". Anybody got any ideas about a : work around? I tried some things, but am a green enuff novice that I didn't : have much luck. : : NOTE: I use the 'if(join...) return 0' as a quick and dirty check, before : launching into a 'foreach $i (@toklist)', so as to save time. Will it, can : forget about it. This would solve my problem, too. To solve your immediate problem, quote metacharacters by saying $token =~ s/(\W)/\\$1/g; However, any time you're doing a linear search in Perl, you're probably doing it wrong. Learn to think in terms of associative arrays. What you want is something like this: %isterm = ("VDD", 1, "GND", 1, IN", 1, "OUT", 1, "INOUT", 1); while(<>) { ($junk, $token) = split; if( $isterm{$token} ) { ... } } Larry