| Subject: | Side effect if notation causes a variable to be unset when condition is false |
I'm running on RH9.0 with perl settings:
[josh@lcc51 bug]$ perl -e 'use Template; print "$Template::VERSION\n";'
2.14
[josh@lcc51 bug]$ perl -V
Summary of my perl5 (revision 5.0 version 8 subversion 0) configuration:
Platform:
osname=linux, osvers=2.4.20-2.48smp, archname=i386-linux-thread-multi
uname='linux str'
config_args='-des -Doptimize=-O2 -march=i386 -mcpu=i686 -g -Dmyhostname=localhost -Dperladmin=root@localhost -Dcc=gcc -Dcf_by=Red Hat, Inc. -Dinstallprefix=/usr -Dprefix=/usr -Darchname=i386-linux -Dvendorprefix=/usr -Dsiteprefix=/usr -Dotherlibdirs=/usr/lib/perl5/5.8.0 -Duseshrplib -Dusethreads -Duseithreads -Duselargefiles -Dd_dosuid -Dd_semctl_semun -Di_db -Ui_ndbm -Di_gdbm -Di_shadow -Di_syslog -Dman3ext=3pm -Duseperlio -Dinstallusrbinperl -Ubincompat5005 -Uversiononly -Dpager=/usr/bin/less -isr'
hint=recommended, useposix=true, d_sigaction=define
usethreads=define use5005threads=undef'
useithreads=define usemultiplicity=
useperlio= d_sfio=undef uselargefiles=define usesocks=undef
use64bitint=undef use64bitall=un uselongdouble=
usemymalloc=, bincompat5005=undef
Compiler:
cc='gcc', ccflags ='-D_REENTRANT -D_GNU_SOURCE -DTHREADS_HAVE_PIDS -DDEBUGGING -fno-strict-aliasing -I/usr/local/include -D_LARGEFILE_SOURCE -D_FILE_OFFSET_BITS=64 -I/usr/include/gdbm',
optimize='',
cppflags='-D_REENTRANT -D_GNU_SOURCE -DTHREADS_HAVE_PIDS -DDEBUGGING -fno-strict-aliasing -I/usr/local/include -I/usr/include/gdbm'
ccversion='', gccversion='3.2.2 20030213 (Red Hat Linux 8.0 3.2.2-1)', gccosandvers=''
gccversion='3.2.2 200302'
intsize=e, longsize= , ptrsize=p, doublesize=8, byteorder=1234
d_longlong=define, longlongsize=8, d_longdbl=define, longdblsize=12
ivtype='long'
k', ivsize=4'
ivtype='long'
known_ext, nvtype='double'
o_nonbl', nvsize=, Off_t='', lseeksize=8
alignbytes=4, prototype=define
Linker and Libraries:
ld='gcc'
l', ldflags =' -L/usr/local/lib'
ldf'
libpth=/usr/local/lib /lib /usr/lib
libs=-lnsl -lgdbm -ldb -ldl -lm -lpthread -lc -lcrypt -lutil
perllibs=
libc=/lib/libc-2.3.1.so, so=so, useshrplib=true, libperl=libper
gnulibc_version='2.3.1'
Dynamic Linking:
dlsrc=dl_dlopen.xs, dlext=so', d_dlsymun=undef, ccdlflags='-rdynamic -Wl,-rpath,/usr/lib/perl5/5.8.0/i386-linux-thread-multi/CORE'
cccdlflags='-fPIC'
ccdlflags='-rdynamic -Wl,-rpath,/usr/lib/perl5', lddlflags='s Unicode/Normalize XS/A'
Characteristics of this binary (from libperl):
Compile-time options: DEBUGGING MULTIPLICITY USE_ITHREADS USE_LARGE_FILES PERL_IMPLICIT_CONTEXT
Locally applied patches:
MAINT18379
Built under linux
Compiled at Feb 18 2003 22:19:53
%ENV:
PERL5LIB="/home/josh/public_html/cgi-bin/site_perl/lib/perl5:/home/josh/public_html/cgi-bin/site_perl/lib/perl5/site_perl:/shared/lcc51/disk1/work/test/multi/tools/lib/perl5/site_perl"
@INC:
/home/josh/public_html/cgi-bin/site_perl/lib/perl5/5.8.0/i386-linux-thread-multi
/home/josh/public_html/cgi-bin/site_perl/lib/perl5/5.8.0
/home/josh/public_html/cgi-bin/site_perl/lib/perl5
/home/josh/public_html/cgi-bin/site_perl/lib/perl5/site_perl/5.8.0/i386-linux-thread-multi
/home/josh/public_html/cgi-bin/site_perl/lib/perl5/site_perl/5.8.0
/home/josh/public_html/cgi-bin/site_perl/lib/perl5/site_perl
/shared/lcc51/disk1/work/test/multi/tools/lib/perl5/site_perl/5.8.0/i386-linux-thread-multi
/shared/lcc51/disk1/work/test/multi/tools/lib/perl5/site_perl/5.8.0
/shared/lcc51/disk1/work/test/multi/tools/lib/perl5/site_perl
/usr/lib/perl5/5.8.0/i386-linux-thread-multi
/usr/lib/perl5/5.8.0
/usr/lib/perl5/site_perl/5.8.0/i386-linux-thread-multi
/usr/lib/perl5/site_perl/5.8.0
/usr/lib/perl5/site_perl
/usr/lib/perl5/vendor_perl/5.8.0/i386-linux-thread-multi
/usr/lib/perl5/vendor_perl/5.8.0
/usr/lib/perl5/vendor_perl
/usr/lib/perl5/5.8.0/i386-linux-thread-multi
/usr/lib/perl5/5.8.0
----------------------
I found that if you want to change the value of a variable with a side effect IF notation it unsets the variable if the condition is false.
The following template:
Start Buggy Template
[% var = 'hello' %]
I'm var: [% var %]
[% IF 0 > 1 %]
[% var = 'wrong1' %]
[% END %]
I should still be: [% var %]
[% IF 0 > 1;
var = 'wrong2';
END;
%]
I should still be: [% var %]
[% var = 'wrong3' IF 1 < 0 %]
What is going on [% var %]
End Buggy Template
produces this output:
Start Buggy Template
I'm var: hello
I should still be: hello
I should still be: hello
What is going on
End Buggy Template
-------------
Notice the if check causes the variable to be unset, but using IF in a normal IF, statement, END notation does not have this effect.