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YAPC::Asia Tokyo 2010 Day 1 テンプレートエンジンの移行
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テンプレートエンジンの移行Changing Template Engine
YAPC::Asia 2010 TokyoTakatsugu Shigeta
@comewalk #sixapartkk #typepad
Q. Have you used any template engine?
Q. Which engine?
HTML::Template
Template
Text::MicroTemplate
Tenjin
MENTA::Template
Mojo::Template
MTML
Text::ClearSilver
Text::Xslate
Migratingfrom HTML::Templateto Template Toolkit
HTML::Template
<TMPL_VAR NAME=foo>
TMPL_VAR, TMPL_IF, TMPL_UNLESS, TMPL_ELSE,
TMPL_LOOP, TMPL_INCLUDE
use HTML::Template;
my $tmpl = HTML::Template->new(filename => 'sample_html_template.tmpl');$tmpl->param('home', '/home/shigeta');$tmpl->param('path', 'path/to');say $tmpl->output;
<body>My Home Directory is <TMPL_VAR NAME=HOME><br />My Path is set to <TMPL_VAR NAME=PATH></body>
Template Toolkit
[% foo %]
GET, IF, UNLESS, ELSE, FOR, INCLUDE(and others )
use Template;
my $tmpl = Template->new;my $vars = { 'home' => '/home/shigeta', 'path' => 'path/to',};
my $output;$tmpl->process('sample_template_toolkit.tt', $vars, \$output);say $output;
<body>My Home Directory is [% home %]<br />My Path is set to [% path %]</body>
History
Motivation
* borrow their templates
* unnecessary code on handler
borrow their templates
unnecessary code on handler
sub handler { $param->{'user_id'} = $user->id; $param->{'blog_id'} = $blog->id; $app->build_page("foobar.tmpl", $param);}
unnecessary code on handler
sub handler { $param->{'user_id'} = $user->id; $param->{'blog_id'} = $blog->id; $param->{'user_name'} = $user->name; $param->{'blog_url'} = $blog->url; $app->build_page("foobar.tmpl", $param);}
schedule
This graph is rough estimates :)
operations
run convert script
TMPL_VAR -> [% foo %]TMPL_IF -> [% IF %]
TMPL_UNLESS -> [% UNLESS %]
TMPL_ELSE ->[% ELSE %]TMPL_LOOP -> [% FOR %]
TMPL_INCLUDE -> [% INCLUDE%]
MT_TRANS -> [% |loc %]foo[% END %]
$ converter <filename><html> : :</html>
$data =~ s!(<(/?)TMPL_([^\s>]+)([^>]*)>)!munge($1, $2, $3, $4)!ge;
$data =~ s!<MT_TRANS ([^>]+)>!munge_locale($1)!ge;
Tips
* Don't use reserved keywords* Don't use camel case variable name* Don't use underscore at first letter like _foo* MT_TRANS multi params
Don't use reserved keywords
<TMPL_VAR NAME=TAGS>
[% tags %]
Don't use reserved keywords
<TMPL_VAR NAME=TAGS>
[% tags %] # NG[% GET tags %] # OK
Don't use camel case variable name
<TMPL_VAR NAME=USERNAME>
[% username %]
# Syntax is OK. But didn't see user name :(
Don't use camel case variable name
<TMPL_VAR NAME=USERNAME>
[% username %]
# see the handler code$param->{UserName} = $user->name;
Don't use camel case variable name
<TMPL_VAR NAME=USERNAME>
[% username %] # NG
$param->{UserName} = $user->name;
[% UserName %] # OK :)
Don't use underscore at first letter like _foo
Any key in a hash which starts with a '_' or '.' character will be considered private and cannot be evaluated or updated from within a template.
via Template::Manual::Variables
MT_TRANS multi params
[error] processing openid_login.tt: file error - parse error - openid_login.tt line 312: unexpected end of input
MT_TRANS multi params
<MT_TRANSphrase="<a href="[_1]">[_2]</a> is the next category." params="<$MTCategoryArchiveLink$>%%<$MTCategoryLabel$>">
sequence
TypePad::View::TT
A wrapper class for TTwhich bridges the gap
between HTML::Template and Template Toolkit
use Template;
my $tmpl = Template->new;my $vars = { 'home' => '/home/shigeta', 'path' => 'path/to',};
my $output;$tmpl->process('sample_template_toolkit.tt', $vars, \$output);say $output;
use HTML::Template;
my $tmpl = HTML::Template->new(filename => 'sample_html_template.tmpl');$tmpl->param('home', '/home/shigeta');$tmpl->param('path', 'path/to');say $tmpl->output;
use TypePad::View::TT;
my $tmpl = TypePad::View:TT->new(filename => 'sample_html_template.tmpl');$tmpl->param('home', '/home/shigeta');$tmpl->param('path', 'path/to');say $tmpl->output;
package TypePad::View::TT;
sub new { $self->{engine} = Template->new; }sub param { my ($key, $val) = @_; $self->{var}->{$key} = $val; }sub process { $self->{engine}->process;}
*output = \&process;
sequence [after]
Benchmark
compare processing speed
Template: 0.0173818HTML::Template: 0.0157874 using Time::HiRes
CentOS 4.6 (64bit), Perl v5.8.9,$Template::VERSION 2.15
$HTML::Template::VERSION 2.8
in near future,Text::Xslate
Embrace Change
- Extreme Programming
Questions?
Thank you for your attention!
