NAME

       "LaTeXML::Core::KeyVal" - Key-Value Definitions in LaTeXML

DESCRIPTION

       Provides an interface to define and access KeyVal definition.  Used in conjunction with
       "LaTeXML::Core::KeyVals" to fully implement KeyVal pairs. It extends
       LaTeXML::Common::Object.

   Exposed Methods
       "DefKeyVal(keyset, key, type, default, %options); "
           Defines a new KeyVal Parameter in the given keyset, key and with optional prefix
           option{prefix}. For descriptions of further parameters, see
           LaTeXML::Core::KeyVal::define.

       "HasKeyVal(prefix, keyset, key); "
           Checks if the given KeyVal pair exists.

       "DisableKeyVal(prefix, keyset, key); "
           Disables the given KeyVal so that it can not be used.

   Constructors
       "<LaTeXML::Core::KeyVal-"new(preset, keyset, key); >>
           Creates a new KeyVal object. This serves as a simple reference to the given KeyVal
           object, regardless of its existence or not.

   KeyVal Key Definition
       "$keyval->define($type, $default, %options);"
           (Re-)defines this Key of kind 'kind'.  Defines a keyword key used in keyval arguments
           for the set keyset and, and if the option code is given, defines appropriate macros
           when used with the keyval package (or extensions thereof).

           If type is given, it defines the type of value that must be supplied, such as
           'Dimension'.  If default is given, that value will be used when key is used without an
           equals and explicit value in a keyvals argument.

           A scope option can be given, which can be used to defined the key-value pair globally
           instead of in the current scope.

           Several more options can be given. These implement the behaviour of the xkeyval
           package.

           The prefix parameter can be used to configure a custom prefix for the macros to be
           defined. The kind parameter can be used to configure special types of xkeyval pairs.

           The 'ordinary' kind behaves like a normal keyval parameter.

           The 'command' kind defines a command key, that when run stores the value of the key in
           a special macro, which can be further specefied by the macroprefix option.

           The 'choice' kind defines a choice key, which takes additional options choices (to
           specify which choices are valid values), mismatch (to be run if an invalid choice is
           made) and bin (see xkeyval documentation for details).

           The 'boolean' kind defines a special choice key that takes possible values true and
           false, and defines a new Conditional according to the assumed value. The name of this
           conditional can be specified with the macroprefix option.

           The kind parameter only takes effect when code is given, otherwise only meta-data is
           stored.

       "$keyval->defineOrdinary($code);"
           Helper function to define $STATE necessary for an ordinary key.

       "$keyval->defineCommand($code, $macroprefix);"
           Helper function to define $STATE necessary for a command key.

       "$keyval->defineChoice($code, $mismatch, $choices, $normalize, $bin);"
           Helper function to define $STATE necessary for an choice key.

       "$keyval->defineBoolean($code, $mismatch, $macroprefix);"
           Helper function to define $STATE necessary for a boolean key.

AUTHOR

       Tom Wiesing <tom.wiesing@gmail.com>

COPYRIGHT

       Public domain software, produced as part of work done by the United States Government &
       not subject to copyright in the US.