% Copyright 2012-2014, Alexander Shibakov
% This file is part of SPLinT
%
% SPLinT is free software: you can redistribute it and/or modify
% it under the terms of the GNU General Public License as published by
% the Free Software Foundation, either version 3 of the License, or
% (at your option) any later version.
%
% SPLinT 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.  See the
% GNU General Public License for more details.
%
% You should have received a copy of the GNU General Public License
% along with SPLinT.  If not, see <http://www.gnu.org/licenses/>.

% macros for typeseting productions

% these macros carefully orchestrate the startup of the parsing machinery, bootstrapping the parser if 
% necessary. they can be used as an example of such macros when different use of the parsing mechanisms
% is desired.

\ifx\optimization\UNDEFINED % this trick is based on the premise that \UNDEFINED is never defined nor
    \def\optimization{0}%     created with \csname ... \endcsname
\fi

\newread\trybs
\newwrite\tokendefs
\let\nx\noexpand

\def\drvname{bo}

\input yycommon.sty % general routines for stack and array access
\input yymisc.sty   % helper macros (stack manipulation, table processing, value stack pointers)
\input yyinput.sty  % input functions
\input yyparse.sty  % parser machinery
\input flex.sty     % lexer functions
\input yyboth.sty   % parser intitialization, optimization

\ifnum\optimization>\tw@
    \input yyfaststack.sty
\fi

\input yystype.sty  % scanner auxilary types and functions
\input yyunion.sty  % parser data structures

\def\indexpseudonamespace{[index]}

% the main parser

\def\mainnamespace{[main]}
\let\parsernamespace\mainnamespace

% try to load token equivalence table (making, say, \tokenID the same as \csname token"identifier"\endcsname)

\immediate\openin\trybs=\drvname.tok
\ifeof\trybs 
    \edef\tokendeffile{\drvname.tok}
    \edef\bstrapparser{byytab.tex} % sets \bootstrapmodetrue
    \def\bootstraplexersetup{\let\yylexreturn\yylexreturnbootstrap} % only return tokens whose value is known at bootstrap
    \toksa{\input yybootstrap.sty}
\else 
    \toksa{\input yyinit.sty%
        %\def\fgetelemof#1\at#2{% speeds up the lookup
        %    \csname #1\parsernamespace\the#2\endcsname
        %}%
    }
    \def\appendr#1#2{% faster but dirtier
        \edef\appnext{#1{\the#1#2}}\appnext
    }
    \def\appendl#1#2{% faster but dirtier
        \edef\appnext{#1{#2\the#1}}\appnext
    }
\fi

\immediate\closein\trybs
\the\toksa
