NAME

       "LaTeXML::Core::State" - stores the current state of processing.

DESCRIPTION

       A "LaTeXML::Core::State" object stores the current state of processing.  It recording
       catcodes, variables values, definitions and so forth, as well as mimicing TeX's scoping
       rules.

   Access to State and Processing
       "$STATE->getStomach;"
           Returns the current Stomach used for digestion.

       "$STATE->getModel;"
           Returns the current Model representing the document model.

   Scoping
       The assignment methods, described below, generally take a $scope argument, which
       determines how the assignment is made.  The allowed values and thier implications are:

        global   : global assignment.
        local    : local assignment, within the current grouping.
        undef    : global if \global preceded, else local (default)
        <name>   : stores the assignment in a `scope' which
                   can be loaded later.

       If no scoping is specified, then the assignment will be global if a preceding "\global"
       has set the global flag, otherwise the value will be assigned within the current grouping.

       "$STATE->pushFrame;"
           Starts a new level of grouping.  Note that this is lower level than "\bgroup"; See
           LaTeXML::Core::Stomach.

       "$STATE->popFrame;"
           Ends the current level of grouping.  Note that this is lower level than "\egroup"; See
           LaTeXML::Core::Stomach.

       "$STATE->setPrefix($prefix);"
           Sets a prefix (eg. "global" for "\global", etc) for the next operation, if applicable.

       "$STATE->clearPrefixes;"
           Clears any prefixes.

   Values
       "$value = $STATE->lookupValue($name);"
           Lookup the current value associated with the the string $name.

       "$STATE->assignValue($name,$value,$scope);"
           Assign $value to be associated with the the string $name, according to the given
           scoping rule.

           Values are also used to specify most configuration parameters (which can therefor also
           be scoped).  The recognized configuration parameters are:

            VERBOSITY         : the level of verbosity for debugging
                                output, with 0 being default.
            STRICT            : whether errors (eg. undefined macros)
                                are fatal.
            INCLUDE_COMMENTS  : whether to preserve comments in the
                                source, and to add occasional line
                                number comments. (Default true).
            PRESERVE_NEWLINES : whether newlines in the source should
                                be preserved (not 100% TeX-like).
                                By default this is true.
            SEARCHPATHS       : a list of directories to search for
                                sources, implementations, etc.

       "$STATE->pushValue($name,$value);"
           This is like "->assign", but pushes a value onto the end of the stored value, which
           should be a LIST reference.  Scoping is not handled here (yet?), it simply pushes the
           value onto the last binding of $name.

       "$boole = $STATE->isValuebound($type,$name,$frame);"
           Returns whether the value $name is bound. If  $frame is given, check whether it is
           bound in the $frame-th frame, with 0 being the top frame.

   Category Codes
       "$value = $STATE->lookupCatcode($char);"
           Lookup the current catcode associated with the the character $char.

       "$STATE->assignCatcode($char,$catcode,$scope);"
           Set $char to have the given $catcode, with the assignment made according to the given
           scoping rule.

           This method is also used to specify whether a given character is active in math mode,
           by using "math:$char" for the character, and using a value of 1 to specify that it is
           active.

   Definitions
       "$defn = $STATE->lookupMeaning($token);"
           Get the "meaning" currently associated with $token, either the definition (if it is a
           control sequence or active character)
            or the token itself if it shouldn't be executable.  (See LaTeXML::Core::Definition)

       "$STATE->assignMeaning($token,$defn,$scope);"
           Set the definition associated with $token to $defn.  If $globally is true, it makes
           this the global definition rather than bound within the current group.  (See
           LaTeXML::Core::Definition, and LaTeXML::Package)

       "$STATE->installDefinition($definition, $scope);"
           Install the definition into the current stack frame under its normal control sequence.

   Named Scopes
       Named scopes can be used to set variables or redefine control sequences within a scope
       other than the standard TeX grouping. For example, the LaTeX implementation will
       automatically activate any definitions that were defined with a named scope of, say
       "section:4", during the portion of the document that has the section counter equal to 4.
       Similarly, a scope named "label:foo" will be activated in portions of the document where
       "\label{foo}" is in effect.

       "$STATE->activateScope($scope);"
           Installs any definitions that were associated with the named $scope.  Note that these
           are placed in the current grouping frame and will disappear when that grouping ends.

       "$STATE->deactivateScope($scope);"
           Removes any definitions that were associated with the named $scope.  Normally not
           needed, since a scopes definitions are locally bound anyway.

       "$sp = $STATE->convertUnit($unit);"
           Converts a TeX unit of the form '10em' (or whatever TeX unit) into scaled points.
           (Defined here since in principle it could track the size of ems and so forth (but
           currently doesn't))

AUTHOR

       Bruce Miller <bruce.miller@nist.gov>

COPYRIGHT

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