% \iffalse meta-comment
%
%% File: l3toks.dtx Copyright (C) 1990-2011 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 "expl3 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
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%
%<*driver|package>
\RequirePackage{l3names}
\GetIdInfo$Id: l3toks.dtx 2478 2011-06-19 21:34:23Z joseph $
  {L3 Experimental token registers}
%</driver|package>
%<*driver>
\documentclass[full]{l3doc}
\begin{document}
  \DocInput{\jobname.dtx}
\end{document}
%</driver>
% \fi
%
% \title{^^A
%   The \pkg{l3toks} package\\ Token registers^^A
%   \thanks{This file describes v\ExplFileVersion,
%     last revised \ExplFileDate.}^^A
% }
%
% \author{^^A
%  The \LaTeX3 Project\thanks
%    {^^A
%      E-mail:
%        \href{mailto:latex-team@latex-project.org}
%          {latex-team@latex-project.org}^^A
%    }^^A
% }
%
% \date{Released \ExplFileDate}
%
% \maketitle
%
% \begin{documentation}
%
% \textbf{THIS ENTIRE MODULE IS DEPRECIATED: DO NOT USE \cs{TOKS_\ldots}
% FUNCTIONS}
%
% \end{documentation}
%
% \begin{implementation}
%
%    \section{\pkg{l3toks} implementation}
%
%    We start by ensuring that the required packages are loaded.
%    \begin{macrocode}
%<*package>
\ProvidesExplPackage
  {\ExplFileName}{\ExplFileDate}{\ExplFileVersion}{\ExplFileDescription}
\package_check_loaded_expl:
%</package>
%<*initex|package>
%    \end{macrocode}
%
% \subsection{Allocation and use}
%
% \begin{macro}{\toks_new:N,\toks_new:c}
%    Allocates a new token register.
%    \begin{macrocode}
%<*initex>
\alloc_new:nnnN {toks} \c_zero \c_max_register_int \tex_toksdef:D
%</initex>
%    \end{macrocode}
%
%    \begin{macrocode}
%<*package>
\cs_new_protected_nopar:Npn \toks_new:N #1 {
  \chk_if_free_cs:N #1
  \newtoks #1
}
%</package>
%    \end{macrocode}
%
%    \begin{macrocode}
\cs_generate_variant:Nn \toks_new:N {c}
%    \end{macrocode}
% \end{macro}
%
%
% \begin{macro}{\toks_use:N}
% \begin{macro}{\toks_use:c}
%    This function returns the contents of a token register.
%    \begin{macrocode}
\cs_new_eq:NN  \toks_use:N \tex_the:D
\cs_generate_variant:Nn \toks_use:N {c}
%    \end{macrocode}
% \end{macro}
% \end{macro}
%
% \begin{macro}{\toks_set:Nn}
% \begin{macro}{\toks_set:NV}
% \begin{macro}{\toks_set:Nv}
% \begin{macro}{\toks_set:No}
% \begin{macro}{\toks_set:Nx}
% \begin{macro}{\toks_set:Nf}
% \begin{macro}{\toks_set:cn}
% \begin{macro}{\toks_set:co}
% \begin{macro}{\toks_set:cV}
% \begin{macro}{\toks_set:cv}
% \begin{macro}{\toks_set:cx}
% \begin{macro}{\toks_set:cf}
%    |\toks_set:Nn|\m{toks}\m{stuff} stores \m{stuff} without expansion
%    in \m{toks}. |\toks_set:No| and |\toks_set:Nx| expand \m{stuff} once
%    and fully.
%    \begin{macrocode}
%<*check>
\cs_new_protected_nopar:Npn \toks_set:Nn #1 { \chk_local:N #1 #1 }
\cs_generate_variant:Nn \toks_set:Nn {No,Nf}
%</check>
%    \end{macrocode}
%    If we don't check if \m{toks} is a local register then the
%    |\toks_set:Nn| function has nothing to do.
%    We implement |\toks_set:No|/|d|/|f| by hand when not checking because this
%    is going to be used \emph{extensively} in keyval processing!
%    TODO: (Will) Can we get some numbers published on how necessary this is?
%    On the other hand I'm happy to believe Morten |:)|
%    \begin{macrocode}
%<*!check>
\cs_new_eq:NN       \toks_set:Nn \prg_do_nothing:
\cs_new_protected:Npn \toks_set:NV #1#2 { 
  #1 \exp_after:wN { \int_to_roman:w -`0 \exp_eval_register:N #2 }
}
\cs_new_protected:Npn \toks_set:Nv #1#2 { 
  #1 \exp_after:wN { \int_to_roman:w -`0 \exp_eval_register:c {#2} }
}
\cs_new_protected:Npn \toks_set:No #1#2 { #1 \exp_after:wN {#2} }
\cs_new_protected:Npn \toks_set:Nf #1#2 {
  #1 \exp_after:wN { \int_to_roman:w -`0#2 }
}
%</!check>
%    \end{macrocode}
% 
%    \begin{macrocode}
\cs_generate_variant:Nn \toks_set:Nn {Nx,cn,cV,cv,co,cx,cf}
%    \end{macrocode}
% \end{macro}
% \end{macro}
% \end{macro}
% \end{macro}
% \end{macro}
% \end{macro}
% \end{macro}
% \end{macro}
% \end{macro}
% \end{macro}
% \end{macro}
% \end{macro}
%
% \begin{macro}{\toks_gset:Nn}
% \begin{macro}{\toks_gset:NV}
% \begin{macro}{\toks_gset:No}
% \begin{macro}{\toks_gset:Nx}
% \begin{macro}{\toks_gset:cn}
% \begin{macro}{\toks_gset:cV}
% \begin{macro}{\toks_gset:co}
% \begin{macro}{\toks_gset:cx}
%    These functions are the global variants of the above.
%    \begin{macrocode}
%<check>\cs_new_protected_nopar:Npn \toks_gset:Nn #1 { \chk_global:N #1 \pref_global:D #1 }
%<!check>\cs_new_eq:NN \toks_gset:Nn \pref_global:D
\cs_generate_variant:Nn \toks_gset:Nn {NV,No,Nx,cn,cV,co,cx}
%    \end{macrocode}
% \end{macro}
% \end{macro}
% \end{macro}
% \end{macro}
% \end{macro}
% \end{macro}
% \end{macro}
% \end{macro}
%
%  \begin{macro}{\toks_set_eq:NN}
%  \begin{macro}{\toks_set_eq:Nc}
%  \begin{macro}{\toks_set_eq:cN}
%  \begin{macro}{\toks_set_eq:cc}
%  \begin{macro}{\toks_gset_eq:NN}
%  \begin{macro}{\toks_gset_eq:Nc}
%  \begin{macro}{\toks_gset_eq:cN}
%  \begin{macro}{\toks_gset_eq:cc}
%    |\toks_set_eq:NN|\m{toks1}\m{toks2} copies the contents of \m{toks2}
%    in \m{toks1}.
%    \begin{macrocode}
%<*check>
\cs_new_protected_nopar:Npn\toks_set_eq:NN #1#2 {
  \chk_local:N #1
  \chk_var_or_const:N #2
  #1 #2
}
\cs_new_protected_nopar:Npn\toks_gset_eq:NN #1#2 {
  \chk_global:N #1
  \chk_var_or_const:N #2
  \pref_global:D #1 #2
}
%</check>
%<*!check>
\cs_new_eq:NN \toks_set_eq:NN  \prg_do_nothing:
\cs_new_eq:NN \toks_gset_eq:NN \pref_global:D
%</!check>
\cs_generate_variant:Nn \toks_set_eq:NN  {Nc,cN,cc}
\cs_generate_variant:Nn \toks_gset_eq:NN  {Nc,cN,cc}
%    \end{macrocode}
%  \end{macro}
%  \end{macro}
%  \end{macro}
%  \end{macro}
%  \end{macro}
%  \end{macro}
%  \end{macro}
%  \end{macro}
%
% \begin{macro}{\toks_clear:N,\toks_gclear:N,\toks_clear:c,\toks_gclear:c}
%    These functions clear a token register, either locally or globally.
%    \begin{macrocode}
\cs_new_protected_nopar:Npn \toks_clear:N #1 {
  #1\c_empty_toks
%<check>\chk_local_or_pref_global:N #1
}
%    \end{macrocode}
% 
%    \begin{macrocode}
\cs_new_protected_nopar:Npn \toks_gclear:N {
%<check>  \pref_global_chk:
%<!check>  \pref_global:D
  \toks_clear:N
}
%    \end{macrocode}
% 
%    \begin{macrocode}
\cs_generate_variant:Nn \toks_clear:N  {c}
\cs_generate_variant:Nn \toks_gclear:N {c}
%    \end{macrocode}
% \end{macro}
%
% \begin{macro}{\toks_use_clear:N}
% \begin{macro}{\toks_use_clear:c}
% \begin{macro}{\toks_use_gclear:N}
% \begin{macro}{\toks_use_gclear:c}
%    These functions clear a token register (locally or globally) after
%    returning the contents.
%
%    They make sure that clearing the register does not
%    interfere with following tokens. In other words, the contents of
%    the register might operate on what follows in the input stream.
%    \begin{macrocode}
\cs_new_protected_nopar:Npn \toks_use_clear:N #1 {
  \exp_last_unbraced:NNV \toks_clear:N #1 #1
}
%    \end{macrocode}
%
%    \begin{macrocode}
\cs_new_protected_nopar:Npn \toks_use_gclear:N {
%<check>  \pref_global_chk:
%<!check>  \pref_global:D
  \toks_use_clear:N
}
%    \end{macrocode}
%
%    \begin{macrocode}
\cs_generate_variant:Nn \toks_use_clear:N  {c}
\cs_generate_variant:Nn \toks_use_gclear:N {c}
%    \end{macrocode}
% \end{macro}
% \end{macro}
% \end{macro}
% \end{macro}
%
% \begin{macro}{\toks_show:N}
% \begin{macro}{\toks_show:c}
%    This function shows the contents of a token register on the terminal.
%    \begin{macrocode}
\cs_new_eq:NN           \toks_show:N \kernel_register_show:N
\cs_generate_variant:Nn \toks_show:N {c}
%    \end{macrocode}
% \end{macro}
% \end{macro}
%
% \subsection{Adding to token registers' contents}
%
% \begin{macro}{\toks_put_left:Nn}
% \begin{macro}{\toks_put_left:NV}
% \begin{macro}{\toks_put_left:No}
% \begin{macro}{\toks_put_left:Nx}
% \begin{macro}{\toks_put_left:cn}
% \begin{macro}{\toks_put_left:cV}
% \begin{macro}{\toks_put_left:co}
% \begin{macro}{\toks_gput_left:Nn}
% \begin{macro}{\toks_gput_left:NV}
% \begin{macro}{\toks_gput_left:No}
% \begin{macro}{\toks_gput_left:Nx}
% \begin{macro}{\toks_gput_left:cn}
% \begin{macro}{\toks_gput_left:cV}
% \begin{macro}{\toks_gput_left:co}
% \begin{macro}[aux]{\toks_put_left_aux:w}
%   |\toks_put_left:Nn |\meta{toks}\meta{stuff\/} adds the tokens of
%   \textsl{stuff} on the `left-side' of the token register
%   \m{toks}. |\toks_put_left:No| does the same, but expands the
%   tokens once. We need to look out for brace stripping so we add a
%   token, which is then later removed.
%    \begin{macrocode}
\cs_new_protected_nopar:Npn \toks_put_left:Nn #1 {
  \exp_after:wN \toks_put_left_aux:w \exp_after:wN \q_nil
    \toks_use:N #1 \q_stop #1
}
%    \end{macrocode}
% 
%    \begin{macrocode}
\cs_generate_variant:Nn \toks_put_left:Nn  {NV,No,Nx,cn,co,cV}
%    \end{macrocode}
% 
%    \begin{macrocode}
\cs_new_protected_nopar:Npn \toks_gput_left:Nn {
%<check>  \pref_global_chk:
%<!check>  \pref_global:D
  \toks_put_left:Nn
}
%    \end{macrocode}
% 
%    \begin{macrocode}
\cs_generate_variant:Nn \toks_gput_left:Nn  {NV,No,Nx,cn,cV,co}
%    \end{macrocode}
% A helper function for |\toks_put_left:Nn|. Its arguments are
% subsequently the tokens of \meta{stuff\/}, the token register
% \meta{toks} and the current contents of \meta{toks}. We make sure to
% remove the token we inserted earlier.
%    \begin{macrocode}
\cs_new:Npn \toks_put_left_aux:w #1\q_stop #2#3 {
  #2 \exp_after:wN { \use_i:nn {#3} #1 }
%<check>  \chk_local_or_pref_global:N #2
}
%    \end{macrocode}
% \end{macro}
% \end{macro}
% \end{macro}
% \end{macro}
% \end{macro}
% \end{macro}
% \end{macro}
% \end{macro}
% \end{macro}
% \end{macro}
% \end{macro}
% \end{macro}
% \end{macro}
% \end{macro}
% \end{macro}
%
% \begin{macro}{\toks_put_right:Nn}
% \begin{macro}{\toks_put_right:NV}
% \begin{macro}{\toks_put_right:No}
% \begin{macro}{\toks_put_right:Nx}
% \begin{macro}{\toks_put_right:cn}
% \begin{macro}{\toks_put_right:cV}
% \begin{macro}{\toks_put_right:co}
% \begin{macro}{\toks_gput_right:Nn}
% \begin{macro}{\toks_gput_right:NV}
% \begin{macro}{\toks_gput_right:No}
% \begin{macro}{\toks_gput_right:Nx}
% \begin{macro}{\toks_gput_right:cn}
% \begin{macro}{\toks_gput_right:cV}
% \begin{macro}{\toks_gput_right:co}
%    These macros add a list of tokens to the right of a token register.
%    \begin{macrocode}
\cs_new_protected:Npn \toks_put_right:Nn #1#2 {
  #1 \exp_after:wN { \toks_use:N #1 #2 }
%<check>  \chk_local_or_pref_global:N #1
}
%    \end{macrocode}
% 
%    \begin{macrocode}
\cs_new_protected_nopar:Npn \toks_gput_right:Nn {
%<check>  \pref_global_chk:
%<!check>  \pref_global:D
  \toks_put_right:Nn
}
%    \end{macrocode}
%  A couple done by hand for speed.
%    \begin{macrocode}
%<check>\cs_generate_variant:Nn \toks_put_right:Nn {No}
%<*!check>
\cs_new_protected:Npn \toks_put_right:NV #1#2 {
  #1 \exp_after:wN \exp_after:wN \exp_after:wN {
     \exp_after:wN \toks_use:N \exp_after:wN #1 
     \int_to_roman:w -`0 \exp_eval_register:N #2
  }
}
\cs_new_protected:Npn \toks_put_right:No #1#2 {
  #1 \exp_after:wN \exp_after:wN \exp_after:wN { 
    \exp_after:wN \toks_use:N \exp_after:wN #1 #2 
  }
}
%</!check>
\cs_generate_variant:Nn \toks_put_right:Nn {Nx,cn,cV,co}
\cs_generate_variant:Nn \toks_gput_right:Nn {NV,No,Nx,cn,cV,co}
%    \end{macrocode}
% \end{macro}
% \end{macro}
% \end{macro}
% \end{macro}
% \end{macro}
% \end{macro}
% \end{macro}
% \end{macro}
% \end{macro}
% \end{macro}
% \end{macro}
% \end{macro}
% \end{macro}
% \end{macro}
%
% \begin{macro}{\toks_put_right:Nf}
% We implement |\toks_put_right:Nf| by hand because I think I might
% use it in the \textsf{l3keyval} module in which case it is going to
% be used a lot.
%    \begin{macrocode}
%<check>\cs_generate_variant:Nn \toks_put_right:Nn {Nf}
%<*!check>
\cs_new_protected:Npn \toks_put_right:Nf #1#2 {
  #1 \exp_after:wN \exp_after:wN \exp_after:wN {
     \exp_after:wN \toks_use:N \exp_after:wN #1 \int_to_roman:w -`0#2
  }
}
%</!check>
%    \end{macrocode}
% \end{macro}
%
% \subsection{Predicates and conditionals}
%
% \begin{macro}{\toks_if_empty_p:N,\toks_if_empty_p:c}
% \begin{macro}[TF]{\toks_if_empty:N,\toks_if_empty:c}
%   |\toks_if_empty:NTF|\m{toks}\m{true code}\m{false code} tests if a
%   token register is empty and executes either \m{true code} or
%   \m{false code}. This test had the advantage of being
%   expandable. Otherwise one has to do an |x| type expansion in order
%   to prevent problems with parameter tokens.
%    \begin{macrocode}
\prg_new_conditional:Nnn \toks_if_empty:N {p,TF,T,F} {
  \tl_if_empty:VTF #1 {\prg_return_true:} {\prg_return_false:}
}
%    \end{macrocode}
%    \begin{macrocode}
\cs_generate_variant:Nn \toks_if_empty_p:N {c}
\cs_generate_variant:Nn \toks_if_empty:NTF {c}
\cs_generate_variant:Nn \toks_if_empty:NT  {c}
\cs_generate_variant:Nn \toks_if_empty:NF  {c}
%    \end{macrocode}
% \end{macro}
% \end{macro}
%
% \begin{macro}{\toks_if_eq_p:NN,\toks_if_eq_p:cN,\toks_if_eq_p:Nc,\toks_if_eq_p:cc}
% \begin{macro}[TF]{\toks_if_eq:NN,\toks_if_eq:Nc,\toks_if_eq:cN,\toks_if_eq:cc}
%    This function test whether two token registers have the same contents.
%    \begin{macrocode}
\prg_new_conditional:Nnn \toks_if_eq:NN {p,TF,T,F} {
  \str_if_eq:xxTF {\toks_use:N #1} {\toks_use:N #2}
      {\prg_return_true:} {\prg_return_false:}
}
\cs_generate_variant:Nn \toks_if_eq_p:NN {Nc,c,cc}
\cs_generate_variant:Nn \toks_if_eq:NNTF {Nc,c,cc}
\cs_generate_variant:Nn \toks_if_eq:NNT  {Nc,c,cc}
\cs_generate_variant:Nn \toks_if_eq:NNF  {Nc,c,cc}
%    \end{macrocode}
% \end{macro}
% \end{macro}
%
% \subsection{Variables and constants}
%
% \begin{macro}{\l_tmpa_toks}
% \begin{macro}{\l_tmpb_toks}
% \begin{macro}{\l_tmpc_toks}
% \begin{macro}{\g_tmpa_toks}
% \begin{macro}{\g_tmpb_toks}
% \begin{macro}{\g_tmpc_toks}
%    Some scratch registers \ldots
%    \begin{macrocode}
\tex_toksdef:D \l_tmpa_toks = 255\scan_stop:
%<initex>\seq_put_right:Nn \g_toks_allocation_seq {255}
\toks_new:N \l_tmpb_toks
\toks_new:N \l_tmpc_toks
\toks_new:N \g_tmpa_toks
\toks_new:N \g_tmpb_toks
\toks_new:N \g_tmpc_toks
%    \end{macrocode}
% \end{macro}
% \end{macro}
% \end{macro}
% \end{macro}
% \end{macro}
% \end{macro}
%
% \begin{macro}{\c_empty_toks}
%    And here is a constant, which is a (permanently) empty token register.
%    \begin{macrocode}
\toks_new:N \c_empty_toks
%    \end{macrocode}
% \end{macro}
%
% \begin{macro}{\l_tl_replace_toks}
%    And here is one for tl vars. Can't define it there as the allocation
%    isn't set up at that point.
%    \begin{macrocode}
\toks_new:N \l_tl_replace_toks
%    \end{macrocode}
% \end{macro}
%
%    \begin{macrocode}
%</initex|package>
%    \end{macrocode}
%
%
% \end{implementation}
% \PrintIndex
%
% \endinput

