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156 non-PAUSE users.

Sebastian Riedel

NAME

Mojo::Template - Perl-ish templates!

SYNOPSIS

  use Mojo::Template;
  my $mt = Mojo::Template->new;

  # Simple
  my $output = $mt->render(<<'EOF');
  <!DOCTYPE html>
  <html>
    <head><title>Simple</title></head>
    <body>Time: <%= localtime(time) %></body>
  </html>
  EOF
  say $output;

  # More complicated
  my $output = $mt->render(<<'EOF', 23, 'foo bar');
  %= 5 * 5
  % my ($number, $text) = @_;
  test 123
  foo <% my $i = $number + 2; %>
  % for (1 .. 23) {
  * some text <%= $i++ %>
  % }
  EOF
  say $output;

DESCRIPTION

Mojo::Template is a minimalistic and very Perl-ish template engine, designed specifically for all those small tasks that come up during big projects. Like preprocessing a configuration file, generating text from heredocs and stuff like that.

  <% Perl code %>
  <%= Perl expression, replaced with result %>
  <%== Perl expression, replaced with XML escaped result %>
  <%# Comment, useful for debugging %>
  <%% Replaced with "<%", useful for generating templates %>
  % Perl code line, treated as "<% line =%>"
  %= Perl expression line, treated as "<%= line %>"
  %== Perl expression line, treated as "<%== line %>"
  %# Comment line, treated as "<%# line =%>"
  %% Replaced with "%", useful for generating templates

Automatic escaping

Escaping behavior can be reversed with the auto_escape attribute, this is the default in Mojolicious .ep templates for example.

  <%= Perl expression, replaced with XML escaped result %>
  <%== Perl expression, replaced with result %>

Mojo::ByteStream objects are always excluded from automatic escaping.

  <%= b('<div>excluded!</div>') %>

Trimming

Whitespace characters around tags can be trimmed with a special tag ending.

  <%= All whitespace characters around this expression will be trimmed =%>

Blocks

You can capture whole template blocks for reuse later with the begin and end keywords.

  <% my $block = begin %>
    <% my $name = shift; =%>
    Hello <%= $name %>.
  <% end %>
  <%= $block->('Baerbel') %>
  <%= $block->('Wolfgang') %>

Indentation

Perl lines can also be indented freely.

  % my $block = begin
    % my $name = shift;
    Hello <%= $name %>.
  % end
  %= $block->('Baerbel')
  %= $block->('Wolfgang')

Arguments

Mojo::Template templates work just like Perl subs (actually they get compiled to a Perl sub internally). That means you can access arguments simply via @_.

  % my ($foo, $bar) = @_;
  % my $x = shift;
  test 123 <%= $foo %>

More escaping

You can use escaped tags and lines to generate templates.

  %% my $number = <%= 20 + 3 %>;
  The number is <%%= $number %>

A newline can be escaped with a backslash.

  This is <%= 23 * 3 %> a\
  single line

And a backslash in front of a newline can be escaped with another backslash.

  % use Data::Dumper;
  This will\\
  result <%=  Dumper {foo => 'bar'} %>\\
  in multiple lines

Exceptions

Templates get compiled to Perl code internally, this can make debugging a bit tricky. But Mojo::Template will return Mojo::Exception objects that stringify to error messages with context.

  Bareword "xx" not allowed while "strict subs" in use at template line 4.
  2: </head>
  3: <body>
  4: % my $i = 2; xx
  5: %= $i * 2
  6: </body>

Caching

Mojo::Template does not support caching by itself, but you can easily build a wrapper around it.

  # Compile and store code somewhere
  my $mt = Mojo::Template->new;
  $mt->parse($template);
  $mt->build;
  my $code = $mt->code;

  # Load code and template (template for debug trace only)
  $mt->template($template);
  $mt->code($code);
  $mt->compile;
  my $output = $mt->interpret(@args);

ATTRIBUTES

Mojo::Template implements the following attributes.

auto_escape

  my $auto_escape = $mt->auto_escape;
  $mt             = $mt->auto_escape(1);

Activate automatic XML escaping.

append

  my $code = $mt->append;
  $mt      = $mt->append('warn "Processed template"');

Append Perl code to compiled template.

capture_end

  my $capture_end = $mt->capture_end;
  $mt             = $mt->capture_end('end');

Keyword indicating the end of a capture block, defaults to end.

  <% my $block = begin %>
    Some data!
  <% end %>

capture_start

  my $capture_start = $mt->capture_start;
  $mt               = $mt->capture_start('begin');

Keyword indicating the start of a capture block, defaults to begin.

  <% my $block = begin %>
    Some data!
  <% end %>

code

  my $code = $mt->code;
  $mt      = $mt->code($code);

Compiled template code.

comment_mark

  my $comment_mark = $mt->comment_mark;
  $mt              = $mt->comment_mark('#');

Character indicating the start of a comment, defaults to #.

  <%# This is a comment %>

encoding

  my $encoding = $mt->encoding;
  $mt          = $mt->encoding('UTF-8');

Encoding used for template files.

escape_mark

  my $escape_mark = $mt->escape_mark;
  $mt             = $mt->escape_mark('=');

Character indicating the start of an escaped expression, defaults to =.

  <%== $foo %>

expression_mark

  my $expression_mark = $mt->expression_mark;
  $mt                 = $mt->expression_mark('=');

Character indicating the start of an expression, defaults to =.

  <%= $foo %>

line_start

  my $line_start = $mt->line_start;
  $mt            = $mt->line_start('%');

Character indicating the start of a code line, defaults to %.

  % $foo = 23;

name

  my $name = $mt->name;
  $mt      = $mt->name('foo.mt');

Name of template currently being processed, defaults to template. Note that this method is attribute and might change without warning!

namespace

  my $namespace = $mt->namespace;
  $mt           = $mt->namespace('main');

Namespace used to compile templates, defaults to Mojo::Template::SandBox.

prepend

  my $code = $mt->prepend;
  $mt      = $mt->prepend('my $self = shift;');

Prepend Perl code to compiled template.

replace_mark

  my $replace_mark = $mt->replace_mark;
  $mt              = $mt->replace_mark('%');

Character used for escaping the start of a tag or line, defaults to %.

  <%% my $foo = 23; %>

tag_start

  my $tag_start = $mt->tag_start;
  $mt           = $mt->tag_start('<%');

Characters indicating the start of a tag, defaults to <%.

  <% $foo = 23; %>

tag_end

  my $tag_end = $mt->tag_end;
  $mt         = $mt->tag_end('%>');

Characters indicating the end of a tag, defaults to %>.

  <%= $foo %>

template

  my $template = $mt->template;
  $mt          = $mt->template($template);

Raw template.

tree

  my $tree = $mt->tree;
  $mt      = $mt->tree($tree);

Parsed tree.

trim_mark

  my $trim_mark = $mt->trim_mark;
  $mt           = $mt->trim_mark('-');

Character activating automatic whitespace trimming, defaults to =.

  <%= $foo =%>

METHODS

Mojo::Template inherits all methods from Mojo::Base and implements the following new ones.

new

  my $mt = Mojo::Template->new;

Construct a new Mojo::Template object.

build

  $mt = $mt->build;

Build template.

compile

  my $exception = $mt->compile;

Compile template.

interpret

  my $output = $mt->interpret;
  my $output = $mt->interpret(@args);

Interpret template.

parse

  $mt = $mt->parse($template);

Parse template.

render

  my $output = $mt->render($template);
  my $output = $mt->render($template, @args);

Render template.

render_file

  my $output = $mt->render_file($template_file);
  my $output = $mt->render_file($template_file, @args);

Render template file.

render_file_to_file

  my $exception = $mt->render_file_to_file($template_file, $output_file);
  my $exception = $mt->render_file_to_file(
    $template_file, $output_file, @args
  );

Render template file to a specific file.

render_to_file

  my $exception = $mt->render_to_file($template, $output_file);
  my $exception = $mt->render_to_file($template, $output_file, @args);

Render template to a specific file.

SEE ALSO

Mojolicious, Mojolicious::Guides, http://mojolicio.us.