NAME

       Data::Phrasebook::Loader::YAML - Absract your phrases with YAML.

SYNOPSIS

           use Data::Phrasebook;

           my $q = Data::Phrasebook->new(
               class  => 'Fnerk',
               loader => 'YAML',
               file   => 'phrases.yaml',
           );

           $q->delimiters( qr{ \[% \s* (\w+) \s* %\] }x );
           my $phrase = $q->fetch($keyword);

DESCRIPTION

       This class loader implements phrasebook patterns using YAML.

       Phrases can be contained within one or more dictionaries, with each phrase accessible via
       a unique key. Phrases may contain placeholders, please see Data::Phrasebook for an
       explanation of how to use these. Groups of phrases are kept in a dictionary. In this
       implementation a single file is one complete dictionary.

       An example YAML file:

         ---
         foo: >
           Welcome to [% my %] world.
           It is a nice [%place %].

       Within the phrase text placeholders can be used, which are then replaced with the
       appropriate values once the get() method is called. The default style of placeholders can
       be altered using the delimiters() method.

INHERITANCE

       Data::Phrasebook::Loader::YAML inherits from the base class
       Data::Phrasebook::Loader::Base.  See that module for other available methods and
       documentation.

METHODS

   load
       Given a "file", load it. "file" must contain a YAML map.

          $loader->load( $file, @dict );

       This method is used internally by Data::Phrasebook::Generic's "data" method, to initialise
       the data store.

       It must take a "file" (be it a scalar, or something more complex) and return a handle. The
       "dict" is optional, should you wish to use the dictionary support.

   get
       Returns the phrase stored in the phrasebook, for a given keyword.

          my $value = $loader->get( $key );

       If one or more named dictionaries have been previously selected, they will be searched in
       order, followed by the default dictionary. The first hit on "key" will be returned,
       otherwise "undef" is returned.

   dicts
       Returns the list of dictionaries available.

          my @dicts = $loader->dicts();

       This is the list of all dictionaries available in the source file. If multiple
       dictionaries are not being used, then an empty list will be returned.

   keywords
       Returns the list of keywords available. List is lexically sorted.

        my @keywords = $loader->keywords( $dict );

       If one or more named dictionaries have been previously selected, they will be farmed for
       keywords, followed by the default dictionary.

       The "dict" argument is optional, and may be used to override the search to a single named
       dictionary, or a list of dictionaries if passed by reference, plus the default dictionary
       of course.

       To find all available keywords in all available dictionaries, use the following:

        $loader->keywords( [ $loader->dicts ] );

   set_default
       If a requested phrase is not found in the named dictionary an attempt is made to find it
       in the default dictionary. Data::Phrasebook loaders normally use the first dictionary in
       the phrasebook as the default, but as mentioned in "DICTIONARY SUPPORT" this does not make
       sense because the dictionaries in YAML phrasebooks are not ordered.

       To override the automatically selected default dictionary use this method, and pass it a
       "default_dictionary_name". This value is only reset at phrasebook load time, so you'll
       probably need to trigger a reload:

        $q->loader->set_default( $default_dictionary_name );
        $q->loader->load( $file );

       To reset the loader's behaviour to automatic default dictionary selection, pass this
       method an undefined value, and then reload.

DICTIONARY SUPPORT

       This loader supports the use of dictionaries, as well as multiple dictionaries with a
       search order. If you are unfamiliar with these features, see Data::Phrasebook for more
       information.

       Source data format for a single unnamed dictionary is a YAML stream that has as its root
       node an anonymous hash, like so:

        ---
        first_key: first_value
        second_key: second_value

       In this case, specifying one or more named dictionaries will have no effect.  The single
       dictionary that comprises the YAML file will take the place of your default dictionary, so
       will always be searched. To override this behaviour use the "set_default" object method.

       Multiple dictionaries must be specified using a two-level hash system, where the root node
       of your YAML file is an anonymous hash containing dictionary names, and the values of
       those hash keys are further anonymous hashes containing the dictionary contents. Here is
       an example:

        ---
        dict_one:
           first_key: first_value
           second_key: second_value
        dict_two:
           first_key: first_value
           second_key: second_value

       If you use any other structure for your YAML dictionary files, the result is uncertain,
       and this loader module is very likely to crash your program.

       If a requested phrase is not found in the named dictionary an attempt is made to find it
       in the default dictionary. Data::Phrasebook loaders normally use the first dictionary in
       the phrasebook as the default, but this does not make sense because YAML phrasebook files
       contain an unordered hash of dictionaries.

       This loader will therefore select the first dictionary from the list of lexically sorted
       dictionary names to be the default. To override this behaviour use the "set_default"
       object method. Alternatively, just include a dictionary that is guaranteed to be selected
       for the default (e.g.  "0000default"); it need not contain any keys.

SEE ALSO

       Data::Phrasebook, Data::Phrasebook::Loader.

BUGS, PATCHES & FIXES

       There are no known bugs at the time of this release. However, if you spot a bug or are
       experiencing difficulties, that is not explained within the POD documentation, please send
       an email to barbie@cpan.org or submit a bug to the RT system (http://rt.cpan.org/).
       However, it would help greatly if you are able to pinpoint problems or even supply a
       patch.

       Fixes are dependent upon their severity and my availability. Should a fix not be
       forthcoming, please feel free to (politely) remind me.

AUTHOR

         Original author: Iain Campbell Truskett (16.07.1979 - 29.12.2003)
         Maintainer: Barbie <barbie@cpan.org> since January 2004.
         for Miss Barbell Productions <http://www.missbarbell.co.uk>.

COPYRIGHT AND LICENSE

         Copyright (C) 2003 Iain Truskett.
         Copyright (C) 2004-2012 Barbie for Miss Barbell Productions.

         This module is free software; you can redistribute it and/or
         modify it under the Artistic License 2.0.