Download Advanced Perl Programming by Sriram Srinivasan PDF

By Sriram Srinivasan

Even if your wisdom of Perl is informal or deep, this e-book will make you a extra entire programmer. It covers complicated suggestions for dealing with production-ready Perl courses and explains tools for manipulating facts and gadgets which can have gave the look of magic earlier than. in addition, it units Perl within the context of a bigger setting, giving you the heritage you wish for facing networks, databases, and GUIs. it's also a dialogue of internals that will help you software extra successfully and embed Perl inside of C or C inside Perl. significant subject matters comprise the sensible use of programs and periods (object-oriented programming), complicated info constructions, patience (e.g., utilizing a database), networking, graphical interfaces utilizing the Tk toolkit, interplay with interval services, embedding and lengthening the Perl interpreter, and chosen internals.

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Whenever a reference is encountered, it is also checked with a hash %already_seen to determine whether the reference has been printed before. This prevents the routine from going into an infinite loop in the presence of circular references. All functions manipulate the global variable $level and call print_indented, which appropriately indents and prints the string given to it. 5: Pretty-Printing $level = -1; # Level of indentation sub pretty_print { my $var; foreach $var (@_) { if (ref ($var)) { print_ref($var); } else { print_scalar($var); } } } sub print_scalar { ++$level; my $var = shift; print_indented ($var); --$level; } sub print_ref { my $r = shift; if (exists ($already_seen{$r})) { print_indented ("$r (Seen earlier)"); return; } else { $already_seen{$r}=1; } my $ref_type = ref($r); if ($ref_type eq "ARRAY") { print_array($r); } elsif ($ref_type eq "SCALAR") { print "Ref -> $r"; print_scalar($$r); } elsif ($ref_type eq "HASH") { print_hash($r); } elsif ($ref_type eq "REF") { ++$level; print_indented("Ref -> ($r)"); print_ref($$r); --$level; } else { print_indented ("$ref_type (not supported)"); } } sub print_array { my ($r_array) = @_; ++$level; print_indented ("[ # $r_array"); foreach $var (@$r_array) { if (ref ($var)) { print_ref($var); } else { print_scalar($var); } } print_indented ("]"); --$level; } sub print_hash { my($r_hash) = @_; my($key, $val); ++$level; print_indented ("{ # $r_hash"); while (($key, $val) = each %$r_hash) { $val = ($val ?

An array has one value that represents the collection of scalar values. Each element of the array is a distinct scalar value. This is analogous to a pride of lions being treated as a single entity (which is why we refer to it in the singular) that has properties distinct from those of the individual lion. 4 or anonymous arrays and hashes exemplify. 1 Reference Counts To support painless and transparent memory management, Perl maintains a reference count for every value, whether it is directly pointed to by a name or not.

Unless you want to be a serious contender for the Obfuscated Perl contest, avoid using blocks containing more than two expressions while using the general dereferencing rule stated above. 1 Trojan horses While we are talking about obfuscation, it is worth talking about a very insidious way of including executable code within strings. Normally, when Perl sees a string such as "$a", it does variable interpolation. But you now know that "a" can be replaced by a block as long as it returns a reference to a scalar, so something like this is completely acceptable, even within a string: print "${foo()}"; Replace foo() by system ('/bin/rm *') and you have an unpleasant Trojan horse: print "${system('/bin/rm *')}" Perl treats it like any other function and trusts system to return a reference to a scalar.

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