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%%
%% This is file `l3flag.sty',
%% generated with the docstrip utility.
%%
%% The original source files were:
%%
%% l3flag.dtx  (with options: `package')
%% 
%% EXPERIMENTAL CODE
%% 
%% Do not distribute this file without also distributing the
%% source files specified above.
%% 
%% Do not distribute a modified version of this file.
%% 
%% File: l3flag.dtx Copyright (C) 2011-2012 The LaTeX3 Project
%%
%% It may be distributed and/or modified under the conditions of the
%% LaTeX Project Public License (LPPL), either version 1.3c of this
%% license or (at your option) any later version.  The latest version
%% of this license is in the file
%%
%%    http://www.latex-project.org/lppl.txt
%%
%% This file is part of the "l3experimental bundle" (The Work in LPPL)
%% and all files in that bundle must be distributed together.
%%
%% The released version of this bundle is available from CTAN.
%%
%% -----------------------------------------------------------------------
%%
%% The development version of the bundle can be found at
%%
%%    http://www.latex-project.org/svnroot/experimental/trunk/
%%
%% for those people who are interested.
%%
%%%%%%%%%%%
%% NOTE: %%
%%%%%%%%%%%
%%
%%   Snapshots taken from the repository represent work in progress and may
%%   not work or may contain conflicting material!  We therefore ask
%%   people _not_ to put them into distributions, archives, etc. without
%%   prior consultation with the LaTeX3 Project.
%%
%% -----------------------------------------------------------------------
\RequirePackage{expl3}
\GetIdInfo$Id: l3flag.dtx 3039 2011-12-08 09:22:35Z bruno $
  {L3 Experimental Flags}
\ProvidesExplPackage
  {\ExplFileName}{\ExplFileDate}{\ExplFileVersion}{\ExplFileDescription}
\tl_new:N \g_flag_list_tl
\cs_new_protected:Npn \flag_new:N #1
  {
    \cs_new_eq:NN #1 \c_undefined:D
    \tl_if_in:NnTF \g_flag_list_tl {#1}
      {
        \msg_kernel_error:nnx
          { flag } { already-defined }
          { \token_to_str:N #1 }
      }
      { \tl_gput_right:Nn \g_flag_list_tl {#1} }
  }
\cs_generate_variant:Nn \flag_new:N { c }
\prg_new_conditional:Npnn \flag_test:N #1 { p , T , F , TF }
  {
    \if_cs_exist:N #1
      \prg_return_true:
    \else:
      \prg_return_false:
    \fi:
  }
\prg_new_conditional:Npnn \flag_test:c #1 { p , T , F , TF }
  {
    \if_cs_exist:w #1 \cs_end:
      \prg_return_true:
    \else:
      \prg_return_false:
    \fi:
  }
\cs_new:Npn \flag_raise:N #1
  { \exp_after:wN \use_none:n \cs:w \cs_to_str:N #1 \cs_end: }
\cs_new:Npn \flag_raise:c #1
  { \exp_after:wN \use_none:n \cs:w #1 \cs_end: }
\cs_new_protected:Npn \flag_lower:N #1
  { \cs_set_eq:NN #1 \c_undefined:D }
\cs_generate_variant:Nn \flag_lower:N { c }
\msg_kernel_new:nnnn { flag } { already-defined }
  { The~control~sequence~#1~is~already~declared~as~a~flag. }
  {
    LaTeX~was~asked~to~define~the~flag~#1,~but~it~has~already~
    been~defined~as~a~flag.~The~flag~module~is~mostly~meant~
    for~kernel~use,~and~booleans~should~be~preferred.
  }
%% 
%%
%% End of file `l3flag.sty'.