Template::View(3)

NAME
Template::View - customised view of a template processing context

SYNOPSIS
    # define a view
    [% VIEW view
            # some standard args
            prefix        => 'my_',
            suffix        => '.tt2',
            notfound      => 'no_such_file'
            ...

            # any other data
            title         => 'My View title'
            other_item    => 'Joe Random Data'
            ...
    %]
       # add new data definitions, via 'my' self reference
       [% my.author = "$abw.name <$abw.email>" %]
       [% my.copy   = "&copy; Copyright 2000 $my.author" %]

       # define a local block
       [% BLOCK header %]
       This is the header block, title: [% title or my.title %]
       [% END %]

    [% END %]

    # access data items for view
    [% view.title %]
    [% view.other_item %]

    # access blocks directly ('include_naked' option, set by default)
    [% view.header %]
    [% view.header(title => 'New Title') %]

    # non-local templates have prefix/suffix attached
    [% view.footer %]           # => [% INCLUDE my_footer.tt2 %]

    # more verbose form of block access
    [% view.include( 'header', title => 'The Header Title' ) %]
    [% view.include_header( title => 'The Header Title' ) %]

    # very short form of above ('include_naked' option, set by default)
    [% view.header( title => 'The Header Title' ) %]

    # non-local templates have prefix/suffix attached
    [% view.footer %]           # => [% INCLUDE my_footer.tt2 %]

    # fallback on the 'notfound' template ('my_no_such_file.tt2')
    # if template not found
    [% view.include('missing') %]
    [% view.include_missing %]
    [% view.missing %]

    # print() includes a template relevant to argument type
    [% view.print("some text") %]     # type=TEXT, template='text'

    [% BLOCK my_text.tt2 %]           # 'text' with prefix/suffix
       Text: [% item %]
    [% END %]

    # now print() a hash ref, mapped to 'hash' template
    [% view.print(some_hash_ref) %]   # type=HASH, template='hash'

    [% BLOCK my_hash.tt2 %]           # 'hash' with prefix/suffix
       hash keys: [% item.keys.sort.join(', ')
    [% END %]

    # now print() a list ref, mapped to 'list' template
    [% view.print(my_list_ref) %]     # type=ARRAY, template='list'

    [% BLOCK my_list.tt2 %]           # 'list' with prefix/suffix
       list: [% item.join(', ') %]
    [% END %]

    # print() maps 'My::Object' to 'My_Object'
    [% view.print(myobj) %]

    [% BLOCK my_My_Object.tt2 %]
       [% item.this %], [% item.that %]
    [% END %]

    # update mapping table
    [% view.map.ARRAY = 'my_list_template' %]
    [% view.map.TEXT  = 'my_text_block'    %]

    # change prefix, suffix, item name, etc.
    [% view.prefix = 'your_' %]
    [% view.default = 'anyobj' %]
    ...

DESCRIPTION
TODO

METHODS

  new($context, \%config)
Creates a new Template::View presenting a custom view of the specified $context object.

A reference to a hash array of configuration options may be passed as the second argument.

prefix
    Prefix added to all template names.

        [% USE view(prefix => 'my_') %]
        [% view.view('foo', a => 20) %]     # => my_foo

suffix
    Suffix added to all template names.

        [% USE view(suffix => '.tt2') %]
        [% view.view('foo', a => 20) %]     # => foo.tt2

map Hash array mapping reference types to template names. The print() method uses this to determine which template to use to present any particular item. The TEXT, HASH and ARRAY items default to 'test', 'hash' and 'list' appropriately.

        [% USE view(map => { ARRAY   => 'my_list',
                             HASH    => 'your_hash',
                             My::Foo => 'my_foo', } ) %]

        [% view.print(some_text) %]         # => text
        [% view.print(a_list) %]            # => my_list
        [% view.print(a_hash) %]            # => your_hash
        [% view.print(a_foo) %]             # => my_foo

        [% BLOCK text %]
           Text: [% item %]
        [% END %]

        [% BLOCK my_list %]
           list: [% item.join(', ') %]
        [% END %]

        [% BLOCK your_hash %]
           hash keys: [% item.keys.sort.join(', ')
        [% END %]

        [% BLOCK my_foo %]
           Foo: [% item.this %], [% item.that %]
        [% END %]

method
    Name of a method which objects passed to print() may provide for presenting themselves to the view. If a specific map entry can't be found for an object reference and it supports the method (default: 'present') then the method will be called, passing the view as an argument. The object can then make callbacks against the view to present itself.

        package Foo;

        sub present {
            my ($self, $view) = @_;
            return "a regular view of a Foo\n";
        }

        sub debug {
            my ($self, $view) = @_;
            return "a debug view of a Foo\n";
        }

    In a template:

        [% USE view %]
        [% view.print(my_foo_object) %]     # a regular view of a Foo

        [% USE view(method => 'debug') %]
        [% view.print(my_foo_object) %]     # a debug view of a Foo

default
    Default template to use if no specific map entry is found for an item.

        [% USE view(default => 'my_object') %]

        [% view.print(objref) %]            # => my_object

    If no map entry or default is provided then the view will attempt to construct a template name from the object class, substituting any sequence of non-word characters to single underscores, e.g.

        # 'fubar' is an object of class Foo::Bar
        [% view.print(fubar) %]             # => Foo_Bar

    Any current prefix and suffix will be added to both the default template name and any name constructed from the object class.

notfound
    Fallback template to use if any other isn't found.

item
    Name of the template variable to which the print() method assigns the current item. Defaults to 'item'.

        [% USE view %]
        [% BLOCK list %]
           [% item.join(', ') %]
        [% END %]
        [% view.print(a_list) %]

        [% USE view(item => 'thing') %]
        [% BLOCK list %]
           [% thing.join(', ') %]
        [% END %]
        [% view.print(a_list) %]

view_prefix
    Prefix of methods which should be mapped to view() by AUTOLOAD. Defaults to 'view_'.

        [% USE view %]
        [% view.view_header() %]                    # => view('header')

        [% USE view(view_prefix => 'show_me_the_' %]
        [% view.show_me_the_header() %]             # => view('header')

view_naked
    Flag to indicate if any attempt should be made to map method names to template names where they don't match the view_prefix. Defaults to 0.

        [% USE view(view_naked => 1) %]

        [% view.header() %]                 # => view('header')

  print( $obj1, $obj2, ... \%config)
TODO

  view( $template, \%vars, \%config );
TODO

AUTHOR
Andy Wardley <abw@wardley.org> <http://wardley.org/>

COPYRIGHT
Copyright (C) 2000-2022 Andy Wardley. All Rights Reserved.

This module is free software; you can redistribute it and/or modify it under the same terms as Perl itself.

SEE ALSO
Template::Plugin