NAME

       Biber::Config - Configuration items which need to be saved across the
                       lifetime of a Biber object

         This class contains a static object and static methods to access
         configuration and state data. There are several classes of data in here
         which have separate accessors:

         * Biber options
         * Biblatex options
         * State information used by Biber as it processes entries
         * displaymode date

   _init
           Reset internal hashes to defaults.

   _initopts
           Initialise default options, optionally with config file as argument

   config_file
       Returns the full path of the Biber configuration file.  If returns the first file found
       among:

       •   "biber.conf" in the current directory

       •   "$HOME/.biber.conf"

       •   "$ENV{XDG_CONFIG_HOME}/biber/biber.conf"

       •   "$HOME/Library/biber/biber.conf" (Mac OSX only)

       •   "$ENV{APPDATA}/biber.conf" (Windows only)

       •   the output of "kpsewhich biber.conf" (if available on the system).

       If no file is found, it returns "undef".

   add_uniq_ignore
           Track uniqueness ignore settings found in inheritance data

   get_uniq_ignore
           Retrieve uniqueness ignore settings found in inheritance data

   postprocess_biber_opts
           Place to postprocess biber options when they have been
           gathered from all the possible places that set them

   set_dm
           Sets the data model information object

   get_dm
           Gets the data model information object

   get_dm_helpers
           Sets the datamodel helper lists

   set_ctrlfile_path
           Stores the path to the control file

   get_ctrlfile_path
           Retrieved the path to the control file

   setoption
           Store a Biber config option

   getoption
           Get a Biber option

   setcmdlineoption
           Store a Biber command-line option

   setconfigfileoption
           Store a Biber config-file option

   iscmdlineoption
           Check if an option is explicitly set by user on the command
           line

   isconfigfileoption
           Check if an option is explicitly set by user in their
           config file

   isexplicitoption
           Check if an option is explicitly set by user on the command
           line or in the config file

   setblxoption
           Set a biblatex option on the appropriate scope

   getblxoption
           Get a biblatex option from the global, per-type or per entry scope

           getblxoption('option', ['entrytype'], ['citekey'])

           Returns the value of option. In order of decreasing preference, returns:
           1. Biblatex option defined for entry
           2. Biblatex option defined for entry type
           3. Biblatex option defined globally

   getblxentryoptions
           Get all per-entry options for an entry

   set_graph
          Record node and arc connection types for .dot output

   get_graph
           Return an inheritance graph data structure for an inheritance type

   set_set_pc
         Record a parent->child set relationship

   set_set_cp
         Record a child->parent set relationship

   get_set_pc
         Return a boolean saying if there is a parent->child set relationship

   get_set_cp
         Return a boolean saying if there is a child->parent set relationship

   get_set_children
         Return a list of children for a parent set

   get_set_parents
         Return a list of parents for a child of a set

   set_inheritance
           Record that $target inherited information from $source
           Can be used for crossrefs and xdata. This just records that an entry
           inherited from another entry, for loop detection.

   get_inheritance
           Check if $target directly inherited information from $source
           Can be used for crossrefs and xdata

   is_inheritance_path
         Checks for an inheritance path from entry $e1 to $e2
         Can be used for crossrefs and xdata

       [
                    {s => 'A',
                     t => 'B'},
                    {s => 'A',
                     t => 'E'},
                    {s => 'B',
                     t => 'C'},
                    {s => 'C',
                     t => 'D'} ];

keyorder

   set_keyorder
         Set some key order information

   get_keyorder
         Get some key order information

   get_keyorder_max
         Get maximum key order number for a section

   reset_keyorder
         Reset keyorder - for use in tests where we switch to allkeys

seenkey

   get_seenkey
           Get the count of a key

   incr_seenkey
           Increment the seen count of a key

crossrefkeys

   get_crossrefkeys
           Return ref to array of keys which are crossref targets

xrefkeys

   get_xrefkeys
           Return ref to array of keys which are xref targets

   get_crossrefkey
           Return an integer representing the number of times a
           crossref target key has been ref'ed

   get_xrefkey
           Return an integer representing the number of times a
           xref target key has been ref'ed

   del_crossrefkey
           Remove a crossref target key from the crossrefkeys state

   del_xrefkey
           Remove a xref target key from the xrefkeys state

   incr_crossrefkey
           Increment the crossreferences count for a target crossref key

   incr_xrefkey
           Increment the xreferences count for a target xref key

   dump
           Dump config information (for debugging)

AUTHORS

       Francois Charette, "<firmicus at ankabut.net>" Philip Kime "<philip at kime.org.uk>"

BUGS

       Please report any bugs or feature requests on our Github tracker at
       <https://github.com/plk/biber/issues>.

COPYRIGHT & LICENSE

       Copyright 2009-2017 Francois Charette and Philip Kime, all rights reserved.

       This module is free software.  You can redistribute it and/or modify it under the terms of
       the Artistic License 2.0.

       This program is distributed in the hope that it will be useful, but without any warranty;
       without even the implied warranty of merchantability or fitness for a particular purpose.