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% Copyright 2012-2020, 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
\newwrite\tokendefs
\let\nx\noexpand
\input yycommon.sty % general routines for stack and array access
\input yymisc.sty % helper macros (stack manipulation, table processing, value stack pointers)
% parser intitialization, optimization
\input yyinput.sty % input functions
\input yyparse.sty % parser machinery
\input flex.sty % lexer functions
\ifnum\optimization>\tw@
\input yyfaststack.sty
\fi
\input yystype.sty % scanner auxilary types and functions
\input yyunion.sty % parser data structures
% modify the input routine to recognize \yyendgame; the somewhat verbose end of
% the section is necessary to gracefully handle parser failures: the \endparse
% control sequence must appear outside of any \vb block for \cleanupparse
% to do its job; the \yyinput reads \vb blocks in pairs so the closing \vb{} is
% necessary and is removed by \removefinalvb (see limbo.sty and brack.pl for
% details).
\expandafter\def\expandafter\multicharswitch\expandafter
{\multicharswitch\yyendgame{\yyinput\yyeof\yyeof\endparseinput\removefinalvb}}
\def\indexpseudonamespace{[index]}
% the main parser
\let\parsernamespace\empty
% the bootstrapping parser needs the name of the file where token equivalences will appear
\def\modebootstrap{%
\edef\tokendeffile{\jobname.tok}% so that the name of the token file can track the name of the parser
\edef\bstrapparser{byytab.tex}% sets \bootstrapmodetrue
\def\bootstraplexersetup{\let\yylexreturn\yylexreturnbootstrap}% only return tokens whose value is known at bootstrap
\input yybootstrap.sty%
\def\PB##1{}
\def\inlineTeXx##1{}
}
\def\modenormal{%
\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
}%
%\def\fgetelemof##1\at##2{% speeds up the lookup
% \csname ##1\parsernamespace\the##2\endcsname
%}%
\input yyinit.sty%
\input yytexlex.sty%
}
\input yydebug.sty
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