Mason::Manual::Intro - Getting started with Mason
A few quick examples to get your feet wet with Mason. See Mason::Manual::Setup for how to use Mason to generate web sites.
After installing Mason, you should have a mason command in your installation path (e.g. /usr/local/bin). Try this:
Hello! The local time is <% scalar(localtime) %>.
(where '^D' means ctrl-D or EOF). You should see something like
Hello! The local time is Wed Mar 2 17:11:54 2011.
The mason command reads in a Mason component (template), runs it, and prints the result to standard output. Notice that the tag
<% scalar(localtime) %>
was replaced with the value of its expression. This is called a substitution tag and is a central piece of Mason syntax.
The command line is good for trying quick things, but eventually you're going to want to put your Mason components in files.
In a test directory, create a directory comps and create a file email.mc with the following:
Dear <% $.name %>,
We are pleased to inform you that you have won $<% sprintf("%.2f", $.amount) %>!
The Lottery Commission
die "amount must be a positive value!" unless $.amount > 0;
In addition to the substitution tag we've seen before, we declare two attributes, amount and name, to be passed into the component; and we declare a piece of initialization code to validate the amount.
In the same test directory, create a script test.pl with the following:
2 use Mason;
3 my $interp = Mason->new(comp_root => 'comps', data_dir => 'data');
4 print $interp->run('/email', name => 'Joe', amount => '1500')->output;
Line 3 creates a Mason interpreter, the main Mason object. It specifies two parameters: a component root, indicating the directory hierarchy where your components will live; and a data directory, which Mason will use for internal purposes such as class generation and caching.
Line 4 runs the template - notice that the .mc extension is added automatically - passing values for the name and amount attributes.
Run test.pl, and you should see
We are pleased to inform you that you have won $1500.00!
The Lottery Commission
Jonathan Swartz <firstname.lastname@example.org>
This software is copyright (c) 2012 by Jonathan Swartz.
This is free software; you can redistribute it and/or modify it under the same terms as the Perl 5 programming language system itself.
To install Mason, copy and paste the appropriate command in to your terminal.
perl -MCPAN -e shell
For more information on module installation, please visit the detailed CPAN module installation guide.