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COMS 3101 Programming Languages: Perl Lecture 6

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COMS 3101 Programming Languages: Perl Lecture 6 COMS 3101 Programming Languages: Perl Lecture 6 Fall 2013 Instructor: Ilia Vovsha http://www.cs.columbia.edu/~vovsha/coms3101/perl Lecture Outline Concepts: Subroutine references Symbolic references Saving structures OOP (inheritance) More on modules: CPAN Prgamas: fields, base Module: Class::Struct Pod (plain old documentation) Common remarks 6.2 Concepts Subroutine references Copying referent Symbolic references Saving structures 6.3 Subroutine References Reference to a sub follows similar rules Can use backslash or anonymous sub max { …. }# Anonymous $sub_ ref = \&max; $sub_ ref = sub { …. }; # Calling subroutine &$sub_ref(); $subfb_ref ‐> (); $sub_ref ‐> (1,4,6,8); # Call sub using string my %cmds = ( “process” => \&process_data, “clear” => \&clear_data, “any” => sub {….} ); $cmds{$str} ‐> (); 6.4 Copy Referent To copy referent for another reference: $aref1 = [ 1,2,3 ]; $aref2 = [ 4,5,6 ]; $aref2 = $aref1 # Not a copy! Rather refers to the same location! $aref2 = [ @$aref1 ];# Create a new anonymous reference $href2 = { %{$href1 } }; # Same approach for hashes 6.5 Symbolic References Refers to the name of a variable If we try to dereference, we get access to variable! Can be dangerous! (use strict ‘refs’ to prohibit) $N = “V”; $$N = 5; # Set scalar $V = 5 $N ‐> [0] = 6; # Set element 0 of array V to 6 $N ‐> {key} = 7; # Set key of hash V to 7 &$N; # Call sub V 6.6 Saving Data Structures Save any DS to use later: Data::Dumper module Turn DS into a string, save externally to a file, read in the file and recover DS with eval / do CPAN module Storable: more efficient, but cannot be shared across different architectures use Data::Dumper; open (OUTFILE, “> filename”); print OUTFILE Data::Dumper‐>Dump([\%hash], [‘*hash’]); open (INFILE, “< filename”); undef $/; # undef record separator, read entire file eval <INFILE>; # recreate %hash use Storable; store(\%hash, “filename”); $href = retrieve(“filename”); %hash = % { retrieve(“filename”) } ; 6.7 OOP (inheritance) We can define a hierarchy of classes to share methods between them Deridived / sub class ihinher its methdhods from base / parent / super class The super‐classes are specified in the @ISA array (declared with our) of the derived class. Each element of the array is a package (class) name Single Inheritance: one parent class (search parent for methods) Multiple Inheritance: multiple parent classes (search left‐to‐right through @ISA array, depth‐first order) Once method is found, store in cache for efficiency If @ISA is changed, the cache is invalidated (avoid it if you can!) Constructor Inheritance: no automatic call to base class constructor 6.8 OOP (method search) If method not defined in class: search @ISA at runtime when a call is made ShSearch order given multip le parent classes: lftleft‐to‐rihtight throug h @ISA array, depth‐first # Nissan.pm package Nissan; our @ISA = (Car, Truck); # Call: Nissan‐>new()‐>build(“sedan”); # Search order: 1. Check if method (build) is defined in class (Nissan) 2. Check if method is defined in “$Nissan:: ISA[0]” (Car class) 3. Check if method is defined in @Car::ISA (Car’s @ISA array) 4. When done with ISA[0], repeat steps 2,3, for ISA[1] (Truck class) 6.9 Scoped Variables my • creates private variable visible only within block • hidden from outside of enclosing scope, and hides previously declared variables with identical name • confines name & value to scope • suitable for scalar/array/hash variables our • confines name only to scope (no effect on visibility) • suitable for scalar/array/hash variables • used to access global variables, their initial value inside block unchanged • effects or assignment persist after the scope of declaration (block) local • confines value only to scope • suitable for scalar/array/hash + more variables • initial value for variable is () or undef • value of variable is restored no matter how you exit the block (changes thrown away) • “dynamic” scope: value of variable depends on scope & changes during run‐time • ‘my’ is preferable over ‘local’ APP Scoped Variables (example) $office = "global"; # Global $office &say(); # prints "global" &barney(); # prints "barney global", lexical scope; &fred(); # prints "fred fred", dynamic scope, &say(); # prints "global", restored after &fred() sub say { print "$office\n"; } # print the $office sub barney { my $office = "barney"; print "$office "; &say(); } sub fred { local $office = "fred"; print "$office "; &say(); } APP CPAN Comprehensive Perl Archive Network: repository for modules Installing a module: # Download the .gz file from CPAN, unzip and go to proper directory # Build: perl MakeFile.pl make make test # Install: make install Alternative: install cpanm module cpan App::cpanminus # Install cpanm cpanm Module::Name # get, unpack, build, and install modules 6.12 Method invocation (indirect) Direct approach: arrow operator … INVOCANT‐>METHOD() IdiIndirec t approach: can be ambiguous … METHOD INVOCANT ARGS $mazda = Car ‐> new(); # Class: Car, Method: new, Object: $mazda $mazda ‐> drive(“slow”); # Instance: $mazda, Method: drive $mazda = new Car; # Same as above drive $mazda “slow”; 6.13 Pseudohashes (deprecated!) Pseudohash: reference to array whose 1st element is reference to hash Purpose: can be ttdtreated as array ref or hhhash ref Deprecated: slower, muddling, problems with multiple inheritance Alternatives: restricted hashes (Hash::Util) $ph_ref = [ {maker => 1, color => 2}, “mazda”, “red” ]; # Definition $ph_ref‐>{color}; # Access element (href) $ph_ ref‐>[2]; # Access element (aref) $ph_ref‐>[0]{cost} = 3; # Add element $ph_ref‐>[3] = “cheap”; 6.14 fields pragma “Experimental” feature, enables compile‐time type‐verified class fields NtNote: pseudhdohas hes removed from perl 5105.10 The related base pragma provides for field inheritance from parent class fields::new() creates and blesses a pseudohash comprised of the fields declared using the fields pragma into the specified class. package Car; package Car; use fields qw(maker color cost); sub new { my $class = shift; sub new { my $self = { my $class = shift; maker => “mazda”, my $self = fields::new($class); color => “red”, cost => “” $self‐>{maker} = “mazda”; }; $self‐>{color} = “red”; bless ($self, $class); return $self; return $self; } } 6.15 fields pragma (example) Prevents typos in field names (otherwise accepted): package Car; use fields qw(maker color cost); sub new { my $class = shift; my $self = fields::new($class); $self‐>{{}maker} = “mazda”; $self‐>{color} = “red”; return $self; } sub some_fun { my $self = shift; $self‐>{colour} = “blue”; # Compiler throws error! } 6.16 base pragma Simplifies inheritance in two ways: Assigns to @ISA without having to declare “our @ISA” Inherits fields of parent class if ‘fields’ pragma is used Problem: multiple inheritance is not supported! (raises exception if more than one base class uses ‘fields’ ) package Mazda; use base qw(Car); # Mazda is subclass of Car use fields qw(vehicle mpg); # Inherits fields from Car class, adds two new fields sub new { my $class = shift; my $lf$self = fldfields::new ($l($class ); $self‐>{maker} = “mazda”; # inherited $self‐>{mpg} = 25; # own attribute return $$;self; } 6.17 Class::Struct module Standard module to declare a record‐like class ‘stttruct’ ftifunction provides for constttructor and accessor metho ds on the fly Constructor named ‘new’ Accessor method for each member specified by the hash reference package Car; use Car; use Class::Struct; struct Car => { $kia = Car ‐> new(); name => ‘$’, # SlScalar varibliable $kia ‐> name(“CX5”); size => ‘@’, # array variable $aref = $kia‐>size; specs => ‘%’, # hash variable $kia ‐> size(0,100); type => ‘Truck’, # Truck object $href = $kia‐>spp;ecs; } $kia ‐> specs(‘color’, ‘white’); 1; 6.18 Pod Plain Old Documentation: simple text markup format Simple to use, not too expressive Embed documentation in Perl modules and scripts Translators: convert Pod to various formats • pod2text, pod2html, pod2latex CttContent div ide d itinto paragraphs by empty lines: • verbatim: begins with tabs/spaces (left unformatted) • command: begins with equal sign (format according to directive) • ordinary: begins with something else (minimal formatting) Perl engine throws out all Pod markup 6.19 Pod (example) =head1 Boring Module Synopsis Some I<boring> text about the module followed by even more B<boring> code use Boring ; my $object = Boring‐>new(); =cut sub some_fun { print “Documentation ”; print “is for old people!\n”; } =pod 6.20 Pod (example ctd) =head2 List of methods =over 4 =item 1. First method enforces mild boredom =item 2. Second method puts you to sleep =back 6.21 Exercise (In Class) Remove specific field from a list Suppose you have a row of data stored in a string. The fields of your row may be separated with any delimiter(s). For example: “Name Height Weight 2”. Write a subroutine that deletes the Nth field (N is an argument), and returns the shortened string. 6.22 Common Remarks Filehandles: open($fh, “>filename”); print $fh “ABC”, “\t”, “DEF”; # works fine print $fh, “ABC”, “\t”, “DEF” ; # WRONG: prints to STDOUT Context: ($x) = (aa,bb,cc); # $x gets value “aa” $x = (aa,bb,cc); # $x gets value “cc” @arr = (aa,bb,cc); $x = @arr; # $x = 3 6.23 Common Remarks Efficiency: hashes instead of linear searches # Search $word in @keywords # Method 1: foreach (@keywords) { print “”“yes” if ($wor d eq $)$_); } # Method 2 (potentiall y more efficient): %h; for (@keywords) { $h{$_}++; } print “yes” if ($h{$word} > 0); 6.24 Common
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