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Edit File: xparse.sty

%%
%% This is file `xparse.sty',
%% generated with the docstrip utility.
%%
%% The original source files were:
%%
%% xparse.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: xparse.dtx (C) Copyright 1999 Frank Mittelbach, Chris Rowley,
%%                      David Carlisle
%%                  (C) Copyright 2004-2008 Frank Mittelbach,
%%                      The LaTeX3 Project
%%                  (C) Copyright 2009-2013 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 "l3packages 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 LaTeX Project Team.
%%
%% -----------------------------------------------------------------------
%%
\RequirePackage{expl3}[2013/03/12]
\@ifpackagelater{expl3}{2013/03/12}
  {}
  {%
    \PackageError{xparse}{Support package l3kernel too old}
      {%
        Please install an up to date version of l3kernel\MessageBreak
        using your TeX package manager or from CTAN.\MessageBreak
        \MessageBreak
        Loading xparse will abort!%
      }%
    \endinput
  }
\GetIdInfo$Id: xparse.dtx 4467 2013-03-12 08:29:05Z joseph $
  {L3 Experimental document command parser}
\ProvidesExplPackage
  {\ExplFileName}{\ExplFileDate}{\ExplFileVersion}{\ExplFileDescription}
\group_begin:
\char_set_lccode:nn { `\Q } { `\- }
\char_set_lccode:nn { `\N } { `\N }
\char_set_lccode:nn { `\V } { `\V }
\tl_to_lowercase:n
  {
    \group_end:
    \tl_const:Nn \c__xparse_no_value_tl { QNoValue- }
  }
\prop_new:N \c__xparse_shorthands_prop
\prop_put:Nnn \c__xparse_shorthands_prop { o } { d[] }
\prop_put:Nnn \c__xparse_shorthands_prop { O } { D[] }
\prop_put:Nnn \c__xparse_shorthands_prop { s } { t* }
\bool_new:N \l__xparse_all_long_bool
\tl_new:N \l__xparse_args_tl
\prop_new:N \l__xparse_command_arg_specs_prop
\int_new:N \l__xparse_current_arg_int
\bool_new:N \l__xparse_environment_bool
\prop_new:N \l__xparse_environment_arg_specs_prop
\bool_new:N \l__xparse_expandable_bool
\tl_new:N \l__xparse_expandable_aux_name_tl
\tl_set:Nn \l__xparse_expandable_aux_name_tl
  {
    \l__xparse_function_tl \c_space_tl
    ( arg~ \int_use:N \l__xparse_current_arg_int )
  }
\tl_new:N \l__xparse_fn_tl
\tl_new:N \l__xparse_function_tl
\bool_new:N \l__xparse_long_bool
\int_new:N \l__xparse_m_args_int
\int_new:N \l__xparse_mandatory_args_int
\bool_new:N \l__xparse_processor_bool
\int_new:N \l__xparse_processor_int
\tl_new:N \l__xparse_signature_tl
\tl_new:N \l__xparse_tmp_tl
\cs_new_protected_nopar:Npn \__xparse_declare_cmd:Nnn
  {
    \bool_set_false:N \l__xparse_expandable_bool
    \__xparse_declare_cmd_aux:Nnn
  }
\cs_new_protected_nopar:Npn \__xparse_declare_expandable_cmd:Nnn
  {
    \bool_set_true:N \l__xparse_expandable_bool
    \__xparse_declare_cmd_aux:Nnn
  }
\cs_new_protected:Npn \__xparse_declare_cmd_aux:Nnn #1#2
  {
    \cs_if_exist:NTF #1
      {
        \__msg_kernel_warning:nnxx { xparse } { redefine-command }
          { \token_to_str:N #1 } { \tl_to_str:n {#2} }
      }
      {
        \__msg_kernel_info:nnxx { xparse } { define-command }
          { \token_to_str:N #1 } { \tl_to_str:n {#2} }
      }
    \prop_put:Nnn \l__xparse_command_arg_specs_prop {#1} {#2}
    \bool_set_false:N \l__xparse_environment_bool
    \__xparse_declare_cmd_internal:Nnn #1 {#2}
  }
\cs_new_protected:Npn \__xparse_declare_cmd_internal:Nnn #1#2#3
  {
    \tl_set:Nx \l__xparse_function_tl { \cs_to_str:N #1 }
    \__xparse_count_mandatory:n {#2}
    \__xparse_prepare_signature:n {#2}
    \int_compare:nNnTF \l__xparse_current_arg_int = \l__xparse_m_args_int
      {
        \bool_if:NTF \l__xparse_environment_bool
          { \__xparse_declare_cmd_mixed:Nn #1 {#3} }
          { \__xparse_declare_cmd_all_m:Nn #1 {#3} }
      }
      { \__xparse_declare_cmd_mixed:Nn #1 {#3} }
    \__xparse_break_point:n {#2}
  }
\cs_generate_variant:Nn \__xparse_declare_cmd_internal:Nnn { cnx }
\cs_new_eq:NN \__xparse_break_point:n \use_none:n
\cs_new_protected:Npn \__xparse_declare_cmd_all_m:Nn #1#2
  {
    \cs_generate_from_arg_count:Ncnn #1
      {
        cs_set
        \bool_if:NF \l__xparse_expandable_bool { _protected }
        \bool_if:NF \l__xparse_all_long_bool { _nopar }
        :Npn
      }
      \l__xparse_current_arg_int {#2}
  }
\cs_new_protected:Npn \__xparse_declare_cmd_mixed:Nn
  {
    \bool_if:NTF \l__xparse_expandable_bool
      { \__xparse_declare_cmd_mixed_expandable:Nn }
      { \__xparse_declare_cmd_mixed_aux:Nn }
   }
\cs_new_protected:Npn \__xparse_declare_cmd_mixed_aux:Nn #1#2
  {
    \__xparse_flush_m_args:
    \cs_generate_from_arg_count:cNnn
      { \l__xparse_function_tl \c_space_tl code }
      \cs_set_protected:Npn \l__xparse_current_arg_int {#2}
    \cs_set_protected_nopar:Npx #1
      {
        \int_zero:N \l__xparse_processor_int
        \tl_set:Nn \exp_not:N \l__xparse_args_tl
          { \exp_not:c { \l__xparse_function_tl \c_space_tl code } }
        \tl_set:Nn \exp_not:N \l__xparse_fn_tl
          { \exp_not:c { \l__xparse_function_tl \c_space_tl } }
        \exp_not:o \l__xparse_signature_tl
        \exp_not:N \l__xparse_args_tl
      }
  }
\cs_new_protected:Npn \__xparse_declare_cmd_mixed_expandable:Nn #1#2
  {
    \cs_generate_from_arg_count:cNnn
      { \l__xparse_function_tl \c_space_tl code }
      \cs_set:Npn \l__xparse_current_arg_int {#2}
    \cs_set_nopar:Npx #1
      {
        \exp_not:o \l__xparse_signature_tl
        \exp_not:N \__xparse_grab_expandable_end:wN
        \exp_not:c { \l__xparse_function_tl \c_space_tl code }
        \exp_not:N \q__xparse
        \exp_not:c { \l__xparse_function_tl \c_space_tl }
      }
    \bool_if:NTF \l__xparse_all_long_bool
      { \cs_set:cpx }
      { \cs_set_nopar:cpx }
      { \l__xparse_function_tl \c_space_tl } ##1##2 { ##1 {##2} }
  }
\cs_new_protected:Npn \__xparse_declare_env:nnnn #1#2
  {
    \cs_if_exist:cTF {#1}
      {
        \__msg_kernel_warning:nnxx { xparse } { redefine-environment }
          {#1} { \tl_to_str:n {#2} }
      }
      {
        \__msg_kernel_info:nnxx { xparse } { define-environment }
          {#1} { \tl_to_str:n {#2} }
      }
    \prop_put:Nnn \l__xparse_environment_arg_specs_prop {#1} {#2}
    \bool_set_false:N \l__xparse_expandable_bool
    \bool_set_true:N \l__xparse_environment_bool
    \__xparse_declare_env_internal:nnnn {#1} {#2}
  }
\cs_new_protected:Npn \__xparse_declare_env_internal:nnnn #1#2#3#4
  {
    \__xparse_declare_cmd_internal:cnx { environment~ #1 } {#2}
      {
        \cs_set_protected_nopar:Npx \exp_not:c { environment~ #1 ~end~aux }
          {
            \exp_not:c { environment~ #1~end~aux~ }
            \exp_not:n { \tl_tail:N \l__xparse_args_tl }
          }
        \exp_not:n {#3}
      }
    \cs_set_protected_nopar:cpx { environment~ #1 ~end }
      { \exp_not:c { environment~ #1 ~end~aux } }
    \cs_generate_from_arg_count:cNnn
      { environment~ #1 ~end~aux~ } \cs_set_protected:Npn
      \l__xparse_current_arg_int {#4}
    \cs_set_eq:cc {#1}       { environment~ #1 }
    \cs_set_eq:cc { end #1 } { environment~ #1 ~end }
  }
\cs_new_protected:Npn \__xparse_count_mandatory:n #1
  {
    \int_zero:N \l__xparse_mandatory_args_int
    \__xparse_count_mandatory:N #1
      \q_recursion_tail \q_recursion_tail \q_recursion_tail \q_recursion_stop
  }
\cs_new_protected:Npn \__xparse_count_mandatory:N #1
  {
    \quark_if_recursion_tail_stop:N #1
    \prop_get:NnNTF \c__xparse_shorthands_prop {#1} \l__xparse_tmp_tl
      { \exp_after:wN \__xparse_count_mandatory:N \l__xparse_tmp_tl }
      { \__xparse_count_mandatory_aux:N #1 }
  }
\cs_new_protected:Npn \__xparse_count_mandatory_aux:N #1
  {
    \cs_if_free:cTF { __xparse_count_type_ \token_to_str:N #1 :w }
      { \__xparse_count_type_m:w }
      { \use:c { __xparse_count_type_ \token_to_str:N #1 :w } }
  }
\cs_new_protected:cpn { __xparse_count_type_>:w } #1
  {
    \quark_if_recursion_tail_stop_do:nn {#1} { \__xparse_bad_arg_spec:wn }
    \__xparse_count_mandatory:N
  }
\cs_new_protected_nopar:cpn { __xparse_count_type_+:w }
  { \__xparse_count_mandatory:N }
\cs_new_protected:Npn \__xparse_count_type_d:w #1#2
  {
    \__xparse_single_token_check:n {#1}
    \__xparse_single_token_check:n {#2}
    \quark_if_recursion_tail_stop_do:Nn #2 { \__xparse_bad_arg_spec:wn }
    \__xparse_count_mandatory:N
  }
\cs_new_protected:Npn \__xparse_count_type_D:w #1#2#3
  {
    \__xparse_single_token_check:n {#1}
    \__xparse_single_token_check:n {#2}
    \quark_if_recursion_tail_stop_do:nn {#3} { \__xparse_bad_arg_spec:wn }
    \__xparse_count_mandatory:N
  }
\cs_new_protected_nopar:Npn \__xparse_count_type_g:w
  { \__xparse_count_mandatory:N }
\cs_new_protected:Npn \__xparse_count_type_G:w #1
  {
    \quark_if_recursion_tail_stop_do:nn {#1} { \__xparse_bad_arg_spec:wn }
    \__xparse_count_mandatory:N
  }
\cs_new_protected_nopar:Npn \__xparse_count_type_m:w
  {
    \int_incr:N \l__xparse_mandatory_args_int
    \__xparse_count_mandatory:N
  }
\cs_new_protected:Npn \__xparse_count_type_r:w #1#2
  {
    \__xparse_single_token_check:n {#1}
    \__xparse_single_token_check:n {#2}
    \quark_if_recursion_tail_stop_do:Nn #2 { \__xparse_bad_arg_spec:wn }
    \int_incr:N \l__xparse_mandatory_args_int
    \__xparse_count_mandatory:N
  }
\cs_new_protected:Npn \__xparse_count_type_R:w #1#2#3
  {
    \__xparse_single_token_check:n {#1}
    \__xparse_single_token_check:n {#2}
    \quark_if_recursion_tail_stop_do:nn {#3} { \__xparse_bad_arg_spec:wn }
    \int_incr:N \l__xparse_mandatory_args_int
    \__xparse_count_mandatory:N
  }
\cs_new_protected:Npn \__xparse_count_type_t:w #1
  {
    \__xparse_single_token_check:n {#1}
    \quark_if_recursion_tail_stop_do:Nn #1 { \__xparse_bad_arg_spec:wn }
    \__xparse_count_mandatory:N
  }
\cs_new_protected:Npn \__xparse_count_type_u:w #1
  {
    \quark_if_recursion_tail_stop_do:nn {#1} { \__xparse_bad_arg_spec:wn }
    \int_incr:N \l__xparse_mandatory_args_int
    \__xparse_count_mandatory:N
  }
\cs_new_protected:Npn \__xparse_single_token_check:n #1
  {
    \tl_if_single:nF {#1}
      { \__xparse_single_token_check_aux:nwn {#1} }
  }
\cs_new_protected:Npn \__xparse_single_token_check_aux:nwn
  #1#2 \__xparse_break_point:n #3
  {
    \__msg_kernel_error:nnx { xparse } { not-single-token }
      { \tl_to_str:n {#1} } { \tl_to_str:n {#3} }
  }
\cs_new_protected:Npn \__xparse_bad_arg_spec:wn #1 \__xparse_break_point:n #2
  { \__msg_kernel_error:nnx { xparse } { bad-arg-spec } { \tl_to_str:n {#2} } }
\cs_new_protected:Npn \__xparse_prepare_signature:n #1
  {
    \bool_set_false:N \l__xparse_all_long_bool
    \int_zero:N \l__xparse_current_arg_int
    \bool_set_false:N \l__xparse_long_bool
    \int_zero:N \l__xparse_m_args_int
    \bool_set_false:N \l__xparse_processor_bool
    \tl_clear:N \l__xparse_signature_tl
    \__xparse_prepare_signature:N #1 \q_recursion_tail \q_recursion_stop
  }
\cs_new_protected_nopar:Npn \__xparse_prepare_signature:N
  {
    \bool_set_false:N \l__xparse_processor_bool
    \__xparse_prepare_signature_bypass:N
  }
\cs_new_protected:Npn \__xparse_prepare_signature_bypass:N #1
  {
    \quark_if_recursion_tail_stop:N #1
    \prop_get:NnNTF \c__xparse_shorthands_prop {#1} \l__xparse_tmp_tl
      { \exp_after:wN \__xparse_prepare_signature:N \l__xparse_tmp_tl }
      {
        \int_incr:N \l__xparse_current_arg_int
        \__xparse_prepare_signature_add:N #1
      }
  }
\cs_new_protected:Npn \__xparse_prepare_signature_add:N #1
  {
    \cs_if_exist_use:cF
      {
         __xparse_add
         \bool_if:NT \l__xparse_expandable_bool { _expandable }
         _type_  \token_to_str:N #1 :w
      }
      {
        \__msg_kernel_error:nnx { xparse } { unknown-argument-type }
          { \token_to_str:N #1 }
        \bool_if:NTF \l__xparse_expandable_bool
          { \__xparse_add_expandable_type_m:w }
          { \__xparse_add_type_m:w }
      }
  }
\cs_new_protected_nopar:cpn { __xparse_add_type_+:w }
  {
    \__xparse_flush_m_args:
    \bool_set_true:N \l__xparse_long_bool
    \int_decr:N \l__xparse_current_arg_int
    \__xparse_prepare_signature:N
  }
\cs_new_protected:cpn { __xparse_add_type_>:w } #1
  {
    \bool_set_true:N \l__xparse_processor_bool
    \__xparse_flush_m_args:
    \int_decr:N \l__xparse_current_arg_int
    \tl_put_right:Nn \l__xparse_signature_tl { \__xparse_process_arg:n {#1} }
    \__xparse_prepare_signature_bypass:N
  }
\cs_new_protected:Npn \__xparse_add_type_d:w #1#2
  { \exp_args:NNNo \__xparse_add_type_D:w #1 #2 \c__xparse_no_value_tl }
\cs_new_protected:Npn \__xparse_add_type_D:w #1#2#3
  {
    \__xparse_flush_m_args:
    \__xparse_add_grabber_optional:N D
    \tl_put_right:Nn \l__xparse_signature_tl { #1 #2 {#3} }
    \__xparse_prepare_signature:N
  }
\cs_new_protected_nopar:Npn \__xparse_add_type_g:w
  { \exp_args:No \__xparse_add_type_G:w \c__xparse_no_value_tl }
\cs_new_protected:Npn \__xparse_add_type_G:w #1
  {
    \__xparse_flush_m_args:
    \__xparse_add_grabber_optional:N G
    \tl_put_right:Nn \l__xparse_signature_tl { {#1} }
    \__xparse_prepare_signature:N
  }
\cs_new_protected_nopar:Npn \__xparse_add_type_l:w
  {
    \__xparse_flush_m_args:
    \__xparse_add_grabber_mandatory:N l
    \__xparse_prepare_signature:N
  }
\cs_new_protected_nopar:Npn \__xparse_add_type_m:w
  {
    \bool_if:nTF { \l__xparse_long_bool || \l__xparse_processor_bool }
      {
        \__xparse_flush_m_args:
        \__xparse_add_grabber_mandatory:N m
      }
      { \int_incr:N \l__xparse_m_args_int }
    \__xparse_prepare_signature:N
  }
\cs_new_protected:Npn \__xparse_add_type_r:w #1#2
  { \exp_args:NNNo \__xparse_add_type_R:w #1 #2 \c__xparse_no_value_tl }
\cs_new_protected:Npn \__xparse_add_type_R:w #1#2#3
  {
    \__xparse_flush_m_args:
    \__xparse_add_grabber_mandatory:N R
    \tl_put_right:Nn \l__xparse_signature_tl { #1 #2 {#3} }
    \__xparse_prepare_signature:N
  }
\cs_new_protected:Npn \__xparse_add_type_t:w #1
  {
    \__xparse_flush_m_args:
    \__xparse_add_grabber_optional:N t
    \tl_put_right:Nn \l__xparse_signature_tl { #1 }
    \__xparse_prepare_signature:N
  }
\cs_new_protected:Npn \__xparse_add_type_u:w #1
  {
    \__xparse_flush_m_args:
    \__xparse_add_grabber_mandatory:N u
    \tl_put_right:Nn \l__xparse_signature_tl { {#1} }
    \__xparse_prepare_signature:N
  }
\cs_new_protected_nopar:Npn \__xparse_add_type_v:w
  {
    \__xparse_flush_m_args:
    \__xparse_add_grabber_mandatory:N v
    \__xparse_prepare_signature:N
  }
\cs_new_protected_nopar:Npn \__xparse_flush_m_args:
  {
    \int_compare:nNnT \l__xparse_m_args_int > \c_zero
      {
        \tl_put_right:Nx \l__xparse_signature_tl
           { \exp_not:c { __xparse_grab_m_ \int_use:N \l__xparse_m_args_int :w } }
        \int_set:Nn \l__xparse_mandatory_args_int
          { \l__xparse_mandatory_args_int - \l__xparse_m_args_int }
      }
    \int_zero:N \l__xparse_m_args_int
  }
\cs_new_protected_nopar:Npn \__xparse_add_grabber_mandatory:N #1
  {
    \tl_put_right:Nx \l__xparse_signature_tl
      {
        \exp_not:c
          { __xparse_grab_ #1 \bool_if:NT \l__xparse_long_bool { _long } :w }
      }
    \bool_set_false:N \l__xparse_long_bool
    \int_decr:N \l__xparse_mandatory_args_int
  }
\cs_new_protected_nopar:Npn \__xparse_add_grabber_optional:N #1
  {
    \tl_put_right:Nx \l__xparse_signature_tl
      {
        \exp_not:c
          {
            __xparse_grab_ #1
            \bool_if:NT \l__xparse_long_bool { _long }
            \int_compare:nNnF \l__xparse_mandatory_args_int > \c_zero
              { _trailing }
            :w
          }
      }
    \bool_set_false:N \l__xparse_long_bool
  }
\cs_new_protected_nopar:cpn { __xparse_add_expandable_type_+:w }
  {
    \bool_set_true:N \l__xparse_long_bool
    \int_compare:nNnTF \l__xparse_current_arg_int = \c_one
      { \bool_set_true:N \l__xparse_all_long_bool }
      {
        \bool_if:NF \l__xparse_all_long_bool
          { \__msg_kernel_error:nn { xparse } { inconsistent-long } }
      }
    \int_decr:N \l__xparse_current_arg_int
    \__xparse_prepare_signature:N
  }
\cs_new_protected:cpn { __xparse_add_expandable_type_>:w } #1
  {
    \__msg_kernel_error:nnx { xparse } { processor-in-expandable }
      { \token_to_str:c { \l__xparse_function_tl } }
    \int_decr:N \l__xparse_current_arg_int
    \__xparse_prepare_signature:N
  }
\cs_new_protected:Npn \__xparse_add_expandable_type_d:w #1#2
  {
    \exp_args:NNNo
      \__xparse_add_expandable_type_D:w #1 #2 \c__xparse_no_value_tl
  }
\cs_new_protected:Npn \__xparse_add_expandable_type_D:w #1#2
  {
    \token_if_eq_meaning:NNTF #1 #2
      {
        \__xparse_add_expandable_grabber_optional:n { D_alt }
        \__xparse_add_expandable_type_D_aux:Nn #1
      }
      {
        \__xparse_add_expandable_grabber_optional:n { D }
        \__xparse_add_expandable_type_D_aux:NNn #1#2
      }
  }
\cs_new_protected:Npn \__xparse_add_expandable_type_D_aux:NNn #1#2#3
  {
    \bool_if:NTF \l__xparse_all_long_bool
      { \cs_set:cpx }
      { \cs_set_nopar:cpx }
      { \l__xparse_expandable_aux_name_tl } ##1 ##2 #1 ##3 \q__xparse ##4 #2
      { ##1 {##2} {##3} {##4} }
    \tl_put_right:Nx \l__xparse_signature_tl
      {
        \exp_not:c  { \l__xparse_expandable_aux_name_tl }
        \exp_not:n { #1 #2 {#3} }
      }
    \bool_set_false:N \l__xparse_long_bool
    \__xparse_prepare_signature:N
  }
\cs_new_protected:Npn \__xparse_add_expandable_type_D_aux:Nn #1#2
  {
    \bool_if:NTF \l__xparse_all_long_bool
      { \cs_set:cpx }
      { \cs_set_nopar:cpx }
      { \l__xparse_expandable_aux_name_tl } ##1 #1 ##2 #1
      { ##1 {##2} }
    \tl_put_right:Nx \l__xparse_signature_tl
      {
        \exp_not:c  { \l__xparse_expandable_aux_name_tl }
        \exp_not:n { #1 {#2} }
      }
    \bool_set_false:N \l__xparse_long_bool
    \__xparse_prepare_signature:N
  }
\cs_new_protected_nopar:Npn \__xparse_add_expandable_type_g:w
  {
    \__msg_kernel_error:nnx { xparse } { invalid-expandable-argument-type } { g }
    \__xparse_add_expandable_type_m:w
  }
\cs_new_protected_nopar:Npn \__xparse_add_expandable_type_G:w #1
  {
    \__msg_kernel_error:nnx { xparse } { invalid-expandable-argument-type } { G }
    \__xparse_add_expandable_type_m:w
  }
\cs_new_protected_nopar:Npn \__xparse_add_expandable_type_l:w
  {
    \__msg_kernel_error:nnx { xparse } { invalid-expandable-argument-type } { l }
    \__xparse_add_expandable_type_m:w
  }
\cs_new_protected_nopar:Npn \__xparse_add_expandable_type_m:w
  {
    \int_incr:N \l__xparse_m_args_int
    \__xparse_add_expandable_grabber_mandatory:n { m }
    \bool_set_false:N \l__xparse_long_bool
    \__xparse_prepare_signature:N
  }
\cs_new_protected:Npn \__xparse_add_expandable_type_r:w #1#2
  {
    \exp_args:NNNo
      \__xparse_add_expandable_type_R:w #1 #2 \c__xparse_no_value_tl
  }
\cs_new_protected:Npn \__xparse_add_expandable_type_R:w #1#2
  {
    \token_if_eq_meaning:NNTF #1 #2
      {
        \__xparse_add_expandable_grabber_optional:n { R_alt }
        \__xparse_add_expandable_type_D_aux:Nn #1
      }
      {
        \__xparse_add_expandable_grabber_optional:n { R }
        \__xparse_add_expandable_type_D_aux:NNn #1#2
      }
  }
\cs_new_protected_nopar:Npn \__xparse_add_expandable_type_t:w #1
  {
    \__xparse_add_expandable_grabber_optional:n { t }
    \bool_if:NTF \l__xparse_all_long_bool
      { \cs_set:cpn }
      { \cs_set_nopar:cpn }
      { \l__xparse_expandable_aux_name_tl } ##1 #1 {##1}
    \tl_put_right:Nx \l__xparse_signature_tl
      {
        \exp_not:c  { \l__xparse_expandable_aux_name_tl }
        \exp_not:N #1
      }
    \bool_set_false:N \l__xparse_long_bool
    \__xparse_prepare_signature:N
  }
\cs_new_protected_nopar:Npn \__xparse_add_expandable_type_u:w #1
  {
    \__msg_kernel_error:nnx { xparse } { invalid-expandable-argument-type } { u }
    \__xparse_add_expandable_type_m:w
  }
\cs_new_protected_nopar:Npn \__xparse_add_expandable_type_v:w
  {
    \__msg_kernel_error:nnx { xparse } { invalid-expandable-argument-type } { v }
    \__xparse_add_expandable_type_m:w
  }
\cs_new_protected_nopar:Npn \__xparse_add_expandable_grabber_mandatory:n #1
  {
    \__xparse_add_expandable_long_check:
    \tl_put_right:Nx \l__xparse_signature_tl
      { \exp_not:c { __xparse_expandable_grab_ #1 :w } }
    \bool_set_false:N \l__xparse_long_bool
    \int_decr:N \l__xparse_mandatory_args_int
  }
\cs_new_protected_nopar:Npn \__xparse_add_expandable_grabber_optional:n #1
  {
    \__xparse_add_expandable_long_check:
    \int_compare:nNnF \l__xparse_mandatory_args_int > \c_zero
      { \__msg_kernel_error:nn { xparse } { expandable-ending-optional } }
    \tl_put_right:Nx \l__xparse_signature_tl
      { \exp_not:c { __xparse_expandable_grab_ #1 :w } }
    \bool_set_false:N \l__xparse_long_bool
  }
\cs_new_protected_nopar:Npn \__xparse_add_expandable_long_check:
  {
    \bool_if:nT { \l__xparse_all_long_bool && ! ( \l__xparse_long_bool ) }
      { \__msg_kernel_error:nn { xparse } { inconsistent-long } }
  }
\cs_new_protected:Npn \__xparse_grab_arg:w { }
\cs_new_protected:Npn \__xparse_grab_arg_auxi:w { }
\cs_new_protected:Npn \__xparse_grab_arg_auxii:w { }
\cs_new_protected:Npn \__xparse_grab_D:w #1#2#3#4 \l__xparse_args_tl
  {
    \__xparse_grab_D_aux:NNnnNn #1 #2 {#3} {#4} \cs_set_protected_nopar:Npn
      { _ignore_spaces }
  }
\cs_new_protected:Npn \__xparse_grab_D_long:w #1#2#3#4 \l__xparse_args_tl
  {
    \__xparse_grab_D_aux:NNnnNn #1 #2 {#3} {#4} \cs_set_protected:Npn
      { _ignore_spaces }
  }
\cs_new_protected:Npn \__xparse_grab_D_trailing:w #1#2#3#4 \l__xparse_args_tl
  { \__xparse_grab_D_aux:NNnnNn #1 #2 {#3} {#4} \cs_set_protected_nopar:Npn { } }
\cs_new_protected:Npn \__xparse_grab_D_long_trailing:w #1#2#3#4 \l__xparse_args_tl
  { \__xparse_grab_D_aux:NNnnNn #1 #2 {#3} {#4} \cs_set_protected:Npn { } }
\cs_new_protected:Npn \__xparse_grab_D_aux:NNnnNn #1#2#3#4#5#6
  {
    \__xparse_grab_D_aux:NNnN #1#2 {#4} #5
    \use:c { peek_meaning_remove #6 :NTF } #1
      { \__xparse_grab_arg:w }
      {
        \__xparse_add_arg:n {#3}
        #4 \l__xparse_args_tl
      }
  }
\cs_new_protected:Npn \__xparse_grab_D_aux:NNnN #1#2#3#4
  {
    \cs_set_protected_nopar:Npn \__xparse_grab_arg:w
      {
        \exp_after:wN #4 \l__xparse_fn_tl ####1 #2
          {
            \tl_if_in:nnTF {####1} {#1}
              { \__xparse_grab_D_nested:NNnnN #1 #2 {####1} {#3} #4 }
              {
                \tl_if_blank:oTF { \use_none:n ####1 }
                  { \__xparse_add_arg:o { \use_none:n ####1 } }
                  {
                    \str_if_eq_x:nnTF
                      { \exp_not:o { \use_none:n ####1 } }
                      { { \exp_not:o { \use_ii:nnn ####1 \q_nil } } }
                      { \__xparse_add_arg:o { \use_ii:nn ####1 } }
                      { \__xparse_add_arg:o { \use_none:n ####1 } }
                  }
                #3 \l__xparse_args_tl
              }
          }
        \group_begin:
          \token_if_eq_catcode:NNTF #1 ^
            {
              \char_set_lccode:nn { `A } { `#1 }
              \tl_to_lowercase:n
                {
                  \group_end:
                  \l__xparse_fn_tl A
                }
            }
            {
              \char_set_lccode:nn { `^ } { `#1 }
              \tl_to_lowercase:n
                {
                  \group_end:
                  \l__xparse_fn_tl ^
                }
            }
      }
  }
\tl_new:N \l__xparse_nesting_a_tl
\tl_new:N \l__xparse_nesting_b_tl
\quark_new:N \q__xparse
\cs_new_protected:Npn \__xparse_grab_D_nested:NNnnN #1#2#3#4#5
  {
    \tl_clear:N \l__xparse_nesting_a_tl
    \tl_clear:N \l__xparse_nesting_b_tl
    \exp_after:wN #5 \l__xparse_fn_tl ##1 #1 ##2 \q__xparse ##3 #2
      {
        \tl_put_right:No \l__xparse_nesting_a_tl { \use_none:n ##1 #1 }
        \tl_put_right:No \l__xparse_nesting_b_tl { \use_i:nn #2 ##3 }
        \tl_if_in:nnTF {##2} {#1}
          {
            \l__xparse_fn_tl
              \q_nil ##2 \q__xparse \ERROR
          }
          {
            \tl_put_right:Nx \l__xparse_nesting_a_tl
              { \__xparse_grab_D_nested:w \q_nil ##2 \q_stop }
            \tl_if_in:NnTF \l__xparse_nesting_b_tl {#1}
              {
                \tl_set_eq:NN \l__xparse_tmp_tl \l__xparse_nesting_b_tl
                \tl_clear:N \l__xparse_nesting_b_tl
                \exp_after:wN \l__xparse_fn_tl \exp_after:wN
                  \q_nil \l__xparse_tmp_tl \q_nil \q__xparse \ERROR
              }
              {
                \tl_put_right:No \l__xparse_nesting_a_tl
                  \l__xparse_nesting_b_tl
                \__xparse_add_arg:V \l__xparse_nesting_a_tl
                #4 \l__xparse_args_tl
              }
          }
      }
    \l__xparse_fn_tl #3 \q_nil \q__xparse \ERROR
  }
\cs_new:Npn \__xparse_grab_D_nested:w #1 \q_nil \q_stop
  { \exp_not:o { \use_none:n #1 } }
\cs_new_protected:Npn \__xparse_grab_G:w #1#2 \l__xparse_args_tl
  {
    \__xparse_grab_G_aux:nnNn {#1} {#2} \cs_set_protected_nopar:Npn
      { _ignore_spaces }
  }
\cs_new_protected:Npn \__xparse_grab_G_long:w #1#2 \l__xparse_args_tl
  {
    \__xparse_grab_G_aux:nnNn {#1} {#2} \cs_set_protected:Npn { _ignore_spaces }
  }
\cs_new_protected:Npn \__xparse_grab_G_trailing:w #1#2 \l__xparse_args_tl
  { \__xparse_grab_G_aux:nnNn {#1} {#2} \cs_set_protected_nopar:Npn { } }
\cs_new_protected:Npn \__xparse_grab_G_long_trailing:w #1#2 \l__xparse_args_tl
  { \__xparse_grab_G_aux:nnNn {#1} {#2} \cs_set_protected:Npn { } }
\cs_new_protected:Npn \__xparse_grab_G_aux:nnNn #1#2#3#4
  {
    \exp_after:wN #3 \l__xparse_fn_tl ##1
      {
        \__xparse_add_arg:n {##1}
        #2 \l__xparse_args_tl
      }
    \use:c { peek_meaning #4 :NTF } \c_group_begin_token
      { \l__xparse_fn_tl }
      {
        \__xparse_add_arg:n {#1}
        #2 \l__xparse_args_tl
      }
  }
\cs_new_protected:Npn \__xparse_grab_l:w #1 \l__xparse_args_tl
  { \__xparse_grab_l_aux:nN {#1} \cs_set_protected_nopar:Npn }
\cs_new_protected:Npn \__xparse_grab_l_long:w #1 \l__xparse_args_tl
  { \__xparse_grab_l_aux:nN {#1} \cs_set_protected:Npn }
\cs_new_protected:Npn \__xparse_grab_l_aux:nN #1#2
  {
    \exp_after:wN #2 \l__xparse_fn_tl ##1##
      {
        \__xparse_add_arg:n {##1}
        #1 \l__xparse_args_tl
      }
    \l__xparse_fn_tl
  }
\cs_new_protected:Npn \__xparse_grab_m:w #1 \l__xparse_args_tl
  {
    \exp_after:wN \cs_set_protected_nopar:Npn \l__xparse_fn_tl ##1
      {
        \__xparse_add_arg:n {##1}
        #1 \l__xparse_args_tl
      }
    \l__xparse_fn_tl
  }
\cs_new_protected:Npn \__xparse_grab_m_long:w #1 \l__xparse_args_tl
  {
    \exp_after:wN \cs_set_protected:Npn \l__xparse_fn_tl ##1
      {
        \__xparse_add_arg:n {##1}
        #1 \l__xparse_args_tl
      }
    \l__xparse_fn_tl
  }
\cs_new_protected:cpn { __xparse_grab_m_1:w } #1 \l__xparse_args_tl
  {
    \exp_after:wN \cs_set_protected_nopar:Npn \l__xparse_fn_tl ##1
      {
        \tl_put_right:Nn \l__xparse_args_tl { {##1} }
        #1 \l__xparse_args_tl
      }
    \l__xparse_fn_tl
  }
\cs_new_protected:cpn { __xparse_grab_m_2:w } #1 \l__xparse_args_tl
  {
    \exp_after:wN \cs_set_protected_nopar:Npn \l__xparse_fn_tl
      ##1##2
      {
        \tl_put_right:Nn \l__xparse_args_tl { {##1} {##2} }
        #1 \l__xparse_args_tl
      }
    \l__xparse_fn_tl
  }
\cs_new_protected:cpn { __xparse_grab_m_3:w } #1 \l__xparse_args_tl
  {
    \exp_after:wN \cs_set_protected_nopar:Npn \l__xparse_fn_tl
      ##1##2##3
      {
        \tl_put_right:Nn \l__xparse_args_tl { {##1} {##2} {##3} }
        #1 \l__xparse_args_tl
      }
    \l__xparse_fn_tl
  }
\cs_new_protected:cpn { __xparse_grab_m_4:w } #1 \l__xparse_args_tl
  {
    \exp_after:wN \cs_set_protected_nopar:Npn \l__xparse_fn_tl
      ##1##2##3##4
      {
        \tl_put_right:Nn \l__xparse_args_tl { {##1} {##2} {##3} {##4} }
        #1 \l__xparse_args_tl
      }
    \l__xparse_fn_tl
  }
\cs_new_protected:cpn { __xparse_grab_m_5:w } #1 \l__xparse_args_tl
  {
    \exp_after:wN \cs_set_protected_nopar:Npn \l__xparse_fn_tl
      ##1##2##3##4##5
      {
        \tl_put_right:Nn \l__xparse_args_tl { {##1} {##2} {##3} {##4} {##5} }
        #1 \l__xparse_args_tl
      }
    \l__xparse_fn_tl
  }
\cs_new_protected:cpn { __xparse_grab_m_6:w } #1 \l__xparse_args_tl
  {
    \exp_after:wN \cs_set_protected_nopar:Npn \l__xparse_fn_tl
      ##1##2##3##4##5##6
      {
        \tl_put_right:Nn \l__xparse_args_tl
          { {##1} {##2} {##3} {##4} {##5} {##6} }
        #1 \l__xparse_args_tl
      }
    \l__xparse_fn_tl
  }
\cs_new_protected:cpn { __xparse_grab_m_7:w } #1 \l__xparse_args_tl
  {
    \exp_after:wN \cs_set_protected_nopar:Npn \l__xparse_fn_tl
      ##1##2##3##4##5##6##7
      {
        \tl_put_right:Nn \l__xparse_args_tl
          { {##1} {##2} {##3} {##4} {##5} {##6} {##7} }
        #1 \l__xparse_args_tl
      }
    \l__xparse_fn_tl
  }
\cs_new_protected:cpn { __xparse_grab_m_8:w } #1 \l__xparse_args_tl
  {
    \exp_after:wN \cs_set_protected_nopar:Npn \l__xparse_fn_tl
      ##1##2##3##4##5##6##7##8
      {
        \tl_put_right:Nn \l__xparse_args_tl
          { {##1} {##2} {##3} {##4} {##5} {##6} {##7} {##8} }
        #1 \l__xparse_args_tl
      }
    \l__xparse_fn_tl
  }
\cs_new_protected:Npn \__xparse_grab_R:w #1#2#3#4 \l__xparse_args_tl
  { \__xparse_grab_R_aux:NNnnN #1 #2 {#3} {#4} \cs_set_protected_nopar:Npn }
\cs_new_protected:Npn \__xparse_grab_R_long:w #1#2#3#4 \l__xparse_args_tl
  { \__xparse_grab_R_aux:NNnnN #1 #2 {#3} {#4} \cs_set_protected:Npn }
\cs_new_protected:Npn \__xparse_grab_R_aux:NNnnN #1#2#3#4#5
  {
    \__xparse_grab_D_aux:NNnN #1 #2 {#4} #5
    \peek_meaning_remove_ignore_spaces:NTF #1
      { \__xparse_grab_arg:w }
      {
        \__msg_kernel_error:nnxx { xparse } { missing-required }
          { \token_to_str:N #1 } { \tl_to_str:n {#3} }
        \__xparse_add_arg:n {#3}
        #4 \l__xparse_args_tl
      }
  }
\cs_new_protected:Npn \__xparse_grab_t:w #1#2 \l__xparse_args_tl
  {
    \__xparse_grab_t_aux:NnNn #1 {#2} \cs_set_protected_nopar:Npn
      { _ignore_spaces }
  }
\cs_new_protected:Npn \__xparse_grab_t_long:w #1#2 \l__xparse_args_tl
  { \__xparse_grab_t_aux:NnNn #1 {#2} \cs_set_protected:Npn { _ignore_spaces } }
\cs_new_protected:Npn \__xparse_grab_t_trailing:w #1#2 \l__xparse_args_tl
  { \__xparse_grab_t_aux:NnNn #1 {#2} \cs_set_protected_nopar:Npn { } }
\cs_new_protected:Npn \__xparse_grab_t_long_trailing:w #1#2 \l__xparse_args_tl
  { \__xparse_grab_t_aux:NnNn #1 {#2} \cs_set_protected:Npn { } }
\cs_new_protected:Npn \__xparse_grab_t_aux:NnNn #1#2#3#4
  {
    \exp_after:wN #3 \l__xparse_fn_tl
      {
        \use:c { peek_meaning_remove #4 :NTF } #1
          {
            \__xparse_add_arg:n { \BooleanTrue }
            #2 \l__xparse_args_tl
          }
          {
            \__xparse_add_arg:n { \BooleanFalse }
            #2 \l__xparse_args_tl
          }
      }
    \l__xparse_fn_tl
  }
\cs_new_protected:Npn \__xparse_grab_u:w #1#2 \l__xparse_args_tl
  { \__xparse_grab_u_aux:nnN {#1} {#2} \cs_set_protected_nopar:Npn }
\cs_new_protected:Npn \__xparse_grab_u_long:w #1#2 \l__xparse_args_tl
  { \__xparse_grab_u_aux:nnN {#1} {#2} \cs_set_protected:Npn }
\cs_new_protected:Npn \__xparse_grab_u_aux:nnN #1#2#3
  {
    \exp_after:wN #3 \l__xparse_fn_tl ##1 #1
      {
        \__xparse_add_arg:n {##1}
        #2 \l__xparse_args_tl
      }
    \l__xparse_fn_tl
  }
\tl_new:N \l__xparse_v_rest_of_signature_tl
\tl_new:N \l__xparse_v_arg_tl
\cs_new_protected_nopar:Npn \__xparse_grab_v:w
  {
    \bool_set_false:N \l__xparse_long_bool
    \__xparse_grab_v_aux:w
  }
\cs_new_protected_nopar:Npn \__xparse_grab_v_long:w
  {
    \bool_set_true:N \l__xparse_long_bool
    \__xparse_grab_v_aux:w
  }
\cs_new_protected:Npn \__xparse_grab_v_aux:w #1 \l__xparse_args_tl
  {
    \tl_set:Nn \l__xparse_v_rest_of_signature_tl {#1}
    \group_begin:
      \group_align_safe_begin:
        \tex_escapechar:D = 92 \scan_stop:
        \tl_clear:N \l__xparse_v_arg_tl
        \peek_N_type:TF
          { \__xparse_grab_v_aux_test:N }
          {
            \peek_meaning_remove:NTF \c_group_begin_token
              {
                \group_align_safe_end:
                \__xparse_grab_v_bgroup:
              }
              { \__xparse_grab_v_aux_abort: }
          }
  }
\cs_new_protected_nopar:Npn \__xparse_grab_v_group_end:
  {
        \group_align_safe_end:
        \exp_args:NNNo
      \group_end:
    \tl_set:Nn \l__xparse_v_arg_tl { \l__xparse_v_arg_tl }
  }
\cs_new_protected:Npn \__xparse_grab_v_aux_test:N #1
  {
    \__xparse_grab_v_aux_put:N #1
    \__xparse_grab_v_token_if_char:NTF #1
      {
        \__xparse_grab_v_aux_catcodes:
        \__xparse_grab_v_aux_loop:N #1
      }
      { \__xparse_grab_v_aux_abort: }
  }
\cs_new_protected:Npn \__xparse_grab_v_aux_loop:N #1
  {
    \peek_N_type:TF
      { \__xparse_grab_v_aux_loop:NN #1 }
      { \__xparse_grab_v_aux_abort: }
  }
\cs_new_protected:Npn \__xparse_grab_v_aux_loop:NN #1 #2
  {
    \__xparse_grab_v_token_if_char:NTF #2
      {
        \token_if_eq_charcode:NNTF #1 #2
          { \__xparse_grab_v_aux_loop_end: }
          {
            \__xparse_grab_v_aux_put:N #2
            \__xparse_grab_v_aux_loop:N #1
          }
      }
      { \__xparse_grab_v_aux_abort: #2 }
  }
\cs_new_protected_nopar:Npn \__xparse_grab_v_aux_loop_end:
  {
    \__xparse_grab_v_group_end:
    \exp_args:Nx \__xparse_add_arg:n { \tl_tail:N \l__xparse_v_arg_tl }
    \l__xparse_v_rest_of_signature_tl \l__xparse_args_tl
  }
\int_new:N \l__xparse_v_nesting_int
\cs_new_protected_nopar:Npx \__xparse_grab_v_bgroup:
  {
    \exp_not:N \__xparse_grab_v_aux_catcodes:
    \exp_not:n { \int_set_eq:NN \l__xparse_v_nesting_int \c_one }
    \exp_not:N \__xparse_grab_v_aux_put:N \iow_char:N \{
    \exp_not:N \__xparse_grab_v_bgroup_loop:
  }
\cs_new_protected:Npn \__xparse_grab_v_bgroup_loop:
  {
    \peek_N_type:TF
      { \__xparse_grab_v_bgroup_loop:N }
      { \__xparse_grab_v_aux_abort: }
  }
\cs_new_protected:Npn \__xparse_grab_v_bgroup_loop:N #1
  {
    \__xparse_grab_v_token_if_char:NTF #1
      {
        \token_if_eq_charcode:NNTF \c_group_end_token #1
          {
            \int_decr:N \l__xparse_v_nesting_int
            \int_compare:nNnTF \l__xparse_v_nesting_int > \c_zero
              {
                \__xparse_grab_v_aux_put:N #1
                \__xparse_grab_v_bgroup_loop:
              }
              { \__xparse_grab_v_aux_loop_end: }
          }
          {
            \token_if_eq_charcode:NNT \c_group_begin_token #1
              { \int_incr:N \l__xparse_v_nesting_int }
            \__xparse_grab_v_aux_put:N #1
            \__xparse_grab_v_bgroup_loop:
          }
      }
      { \__xparse_grab_v_aux_abort: #1 }
  }
\cs_new_protected_nopar:Npn \__xparse_grab_v_aux_catcodes:
  {
    \cs_set_eq:NN \do \char_set_catcode_other:N
    \dospecials
    \tex_endlinechar:D = `\^^M \scan_stop:
    \bool_if:NTF \l__xparse_long_bool
      { \char_set_catcode_other:n { \tex_endlinechar:D } }
      { \char_set_catcode_parameter:n { \tex_endlinechar:D } }
  }
\cs_new_protected_nopar:Npn \__xparse_grab_v_aux_abort:
  {
    \__xparse_grab_v_group_end:
    \__xparse_add_arg:o \c__xparse_no_value_tl
    \exp_after:wN \__xparse_grab_v_aux_abort:w \l__xparse_args_tl \q_stop
  }
\cs_new_protected:Npn \__xparse_grab_v_aux_abort:w #1 #2 \q_stop
  {
    \group_begin:
    \char_set_lccode:nn { `\# } { \tex_endlinechar:D }
    \tl_to_lowercase:n
      { \group_end: \peek_meaning_remove:NTF ## }
      {
        \__msg_kernel_error:nnxx { xparse } { verbatim-newline }
          { \token_to_str:N #1 }
          { \tl_to_str:N \l__xparse_v_arg_tl }
        \l__xparse_v_rest_of_signature_tl \l__xparse_args_tl
      }
      {
        \__msg_kernel_error:nnxx { xparse } { verbatim-already-tokenized }
          { \token_to_str:N #1 }
          { \tl_to_str:N \l__xparse_v_arg_tl }
        \l__xparse_v_rest_of_signature_tl \l__xparse_args_tl
      }
  }
\cs_new_protected:Npn \__xparse_grab_v_aux_put:N #1
  {
    \tl_put_right:Nx \l__xparse_v_arg_tl
      {
        \token_if_active:NTF #1
          { \exp_not:N #1 } { \token_to_str:N #1 }
      }
  }
\cs_new_protected:Npn \__xparse_grab_v_token_if_char:NTF #1
  { \str_if_eq_x:nnTF { } { \str_tail:n {#1} } }
\cs_new_protected:Npn \__xparse_add_arg:n #1
  {
    \int_compare:nNnTF \l__xparse_processor_int = \c_zero
      { \tl_put_right:Nn \l__xparse_args_tl { {#1} } }
      {
        \tl_clear:N \ProcessedArgument
        \__xparse_if_no_value:nTF {#1}
          {
            \int_zero:N \l__xparse_processor_int
            \tl_put_right:Nn \l__xparse_args_tl { {#1} }
          }
          { \__xparse_add_arg_aux:n {#1} }
      }
  }
\cs_generate_variant:Nn \__xparse_add_arg:n { V , o }
\cs_new_protected:Npn \__xparse_add_arg_aux:n #1
  {
    \use:c { __xparse_processor_ \int_use:N \l__xparse_processor_int :n } {#1}
    \int_decr:N \l__xparse_processor_int
    \int_compare:nNnTF \l__xparse_processor_int = \c_zero
      {
        \tl_put_right:Nx \l__xparse_args_tl
          { { \exp_not:V \ProcessedArgument } }
      }
      { \__xparse_add_arg_aux:V \ProcessedArgument }
}
\cs_generate_variant:Nn \__xparse_add_arg_aux:n { V }
\cs_new:Npn \__xparse_expandable_grab_D:w #1 \q__xparse #2
  { #2 { \__xparse_expandable_grab_D:NNNnwNn #1 \q__xparse #2 } }
\cs_new:Npn \__xparse_expandable_grab_D:NNNnwNn #1#2#3#4#5 \q__xparse #6#7
  {
    \str_if_eq:onTF
      { #1 { } { } #7 #2 \q__xparse #3 }
      { { } { #2 } { } }
      {
        #1
          { \__xparse_expandable_grab_D:NNNwNnnn #1#2#3#5 \q__xparse #6 }
          \q_nil { } #2 \ERROR \q__xparse \ERROR
      }
      { #5 {#4} \q__xparse #6 {#7} }
  }
\cs_new:Npn \__xparse_expandable_grab_D:NNNwNnnn #1#2#3#4 \q__xparse #5#6#7#8
  {
    \exp_args:Nof \__xparse_expandable_grab_D:nnNNNwN
      { \use_ii:nn #6 #2 }
      { \__xparse_expandable_grab_D:Nw #3 \exp_stop_f: #7 #8 }
    #1#2#3 #4 \q__xparse #5
  }
\cs_new:Npn \__xparse_expandable_grab_D:Nw #1#2 \ERROR \ERROR { #2 #1 }
\cs_new:Npn \__xparse_expandable_grab_D:nnNNNwN #1#2#3#4#5#6 \q__xparse #7
  {
    \exp_args:No \tl_if_empty:oTF
      { #3 { \use_none:nnn } #2 \q__xparse #5 #4 \q__xparse #5 }
      {
        \tl_if_blank:oTF { \use_none:nn #1#2 }
          { \__xparse_put_arg_expandable:ow { } }
          {
            \str_if_eq_x:nnTF
              { \exp_not:o { \use_none:nn #1#2 } }
              { { \exp_not:o { \use_iii:nnnn #1#2 \q_nil } } }
              { \__xparse_put_arg_expandable:ow { \use_iii:nnn #1#2 } }
              { \__xparse_put_arg_expandable:ow { \use_none:nn #1#2 } }
          }
          #6 \q__xparse #7
      }
      {
        #3
          { \__xparse_expandable_grab_D:NNNwNnnn #3#4#5#6 \q__xparse #7 }
          \q_nil {#1} #2 \ERROR \q__xparse \ERROR
      }
  }
\cs_new:Npn \__xparse_expandable_grab_D_alt:w #1 \q__xparse #2
  { #2 { \__xparse_expandable_grab_D_alt:NNnwNn #1 \q__xparse #2 } }
\cs_new:Npn \__xparse_expandable_grab_D_alt:NNnwNn #1#2#3#4 \q__xparse #5#6
  {
    \str_if_eq:onTF
      { #1 { } #6 #2 #2 }
      { { } #2 }
      {
        #1
          { \__xparse_expandable_grab_D_alt:Nwn #5 #4 \q__xparse }
          #6 \ERROR
      }
      { #4 {#3} \q__xparse #5 {#6} }
  }
\cs_new:Npn \__xparse_expandable_grab_D_alt:Nwn #1#2 \q__xparse #3
  {
    \tl_if_blank:oTF { \use_none:nn #1#2 }
      { \__xparse_put_arg_expandable:ow { } }
      {
        \str_if_eq_x:nnTF
          { \exp_not:o { \use_none:n #3 } }
          { { \exp_not:o { \use_ii:nnn #3 \q_nil } } }
          { \__xparse_put_arg_expandable:ow { \use_ii:nn #3 } }
          { \__xparse_put_arg_expandable:ow { \use_none:n #3 } }
      }
      #2 \q__xparse #1
  }
\cs_new:Npn \__xparse_expandable_grab_m:w #1 \q__xparse #2
  { #2 { \__xparse_expandable_grab_m_aux:wNn #1 \q__xparse #2 } }
\cs_new:Npn \__xparse_expandable_grab_m_aux:wNn #1 \q__xparse #2#3
  { #1 {#3} \q__xparse #2 }
\cs_new:Npn \__xparse_expandable_grab_R:w #1 \q__xparse #2
  { #2 { \__xparse_expandable_grab_R_aux:NNNnwNn #1 \q__xparse #2 } }
\cs_new:Npn \__xparse_expandable_grab_R_aux:NNNnwNn #1#2#3#4#5 \q__xparse #6#7
  {
    \str_if_eq:onTF
      { #1 { } { } #7 #2 \q__xparse #3 }
      { { } { #2 } { } }
      {
        #1
          { \__xparse_expandable_grab_D:NNNwNnnn #1#2#3#5 \q__xparse #6 }
          \q_nil { } #2 \ERROR \q__xparse \ERROR
      }
      {
        \__msg_kernel_expandable_error:nnn
          { xparse } { missing-required } {#2}
        #5 {#4} \q__xparse #6 {#7}
      }
  }
\cs_new:Npn \__xparse_expandable_grab_R_alt:w #1 \q__xparse #2
  { #2 { \__xparse_expandable_grab_R_alt_aux:NNnwNn #1 \q__xparse #2 } }
\cs_new:Npn \__xparse_expandable_grab_R_alt_aux:NNnwNn #1#2#3#4 \q__xparse #5#6
  {
    \str_if_eq:onTF
      { #1 { } #6 #2 #2 }
      { { } #2 }
      {
        #1
          { \__xparse_expandable_grab_D_alt:Nwn #5 #4 \q__xparse }
          #6 \ERROR
      }
      {
        \__msg_kernel_expandable_error:nnn
          { xparse } { missing-required } {#2}
        #4 {#3} \q__xparse #5 {#6}
      }
  }
\cs_new:Npn \__xparse_expandable_grab_t:w #1 \q__xparse #2
  { #2 { \__xparse_expandable_grab_t_aux:NNwn #1 \q__xparse #2 } }
\cs_new:Npn \__xparse_expandable_grab_t_aux:NNwn #1#2#3 \q__xparse #4#5
  {
    \str_if_eq:onTF { #1 { } #5 #2 } { #2 }
      { #3 { \BooleanTrue } \q__xparse #4 }
      { #3 { \BooleanFalse } \q__xparse #4 {#5} }
  }
\cs_new:Npn \__xparse_put_arg_expandable:nw #1#2 \q__xparse { #2 {#1} \q__xparse }
\cs_generate_variant:Nn \__xparse_put_arg_expandable:nw { o }
\cs_new:Npn \__xparse_grab_expandable_end:wN #1 \q__xparse #2 {#1}
\cs_new_protected:Npn \__xparse_process_arg:n #1
  {
    \int_incr:N \l__xparse_processor_int
    \cs_set:cpn { __xparse_processor_ \int_use:N \l__xparse_processor_int :n } ##1
      { #1 {##1} }
  }
\cs_new_protected:Npn \__xparse_process_to_str:n #1
  { \tl_set:Nx \ProcessedArgument { \tl_to_str:n {#1} } }
\cs_new_protected:Npn \__xparse_bool_reverse:N #1
  {
    \bool_if:NTF #1
      { \tl_set:Nn \ProcessedArgument { \c_false_bool } }
      { \tl_set:Nn \ProcessedArgument { \c_true_bool } }
  }
\seq_new:N \l__xparse_split_list_seq
\tl_new:N \l__xparse_split_list_tl
\cs_new_protected:Npn \__xparse_split_list:nn #1#2
  {
    \bool_if:nTF
      {
          \tl_if_single_p:n {#1} &&
        ! ( \token_if_cs_p:N #1 )
      }
      { \__xparse_split_list_single:Nn #1 {#2} }
      { \__xparse_split_list_multi:nn {#1} {#2} }
    }
\cs_set_protected:Npn \__xparse_split_list_multi:nn #1#2
  {
    \seq_set_split:Nnn \l__xparse_split_list_seq {#1} {#2}
    \tl_clear:N \ProcessedArgument
    \seq_map_inline:Nn \l__xparse_split_list_seq
      { \tl_put_right:Nn \ProcessedArgument { {##1} } }
  }
\cs_generate_variant:Nn \__xparse_split_list_multi:nn { nV }
\group_begin:
\char_set_catcode_active:N \@
\cs_new_protected:Npn \__xparse_split_list_single:Nn #1#2
  {
    \tl_set:Nn \l__xparse_split_list_tl {#2}
    \group_begin:
    \char_set_lccode:nn { `\@ } { `#1 }
    \tl_to_lowercase:n
      {
         \group_end:
        \tl_replace_all:Nnn \l__xparse_split_list_tl { @ } {#1}
      }
     \__xparse_split_list_multi:nV {#1}  \l__xparse_split_list_tl
   }
\group_end:
\cs_new_protected:Npn \__xparse_split_argument:nnn #1#2#3
  {
    \__xparse_split_list:nn {#2} {#3}
    \exp_args:Nf \__xparse_split_argument_aux:nnnn
      { \tl_count:N \ProcessedArgument }
      {#1} {#2} {#3}
  }
\cs_new_protected:Npn \__xparse_split_argument_aux:nnnn #1#2#3#4
  {
    \int_compare:nNnF {#1} = { #2 + \c_one }
      {
        \int_compare:nNnTF {#1} > { #2 + \c_one }
          {
            \tl_set:Nx \ProcessedArgument
              {
                \exp_last_unbraced:NnNo
                  \__xparse_split_argument_aux:n
                  { #2 + \c_one }
                  \use_none_delimit_by_q_stop:w
                  \ProcessedArgument
                  \q_stop
              }
            \__msg_kernel_error:nnxxx { xparse } { split-excess-tokens }
              { \tl_to_str:n {#3} } { \int_eval:n { #2 + \c_one } }
              { \tl_to_str:n {#4} }
          }
          {
            \tl_put_right:Nx \ProcessedArgument
              {
                \prg_replicate:nn { #2 + \c_one - (#1) }
                  { { \exp_not:V \c__xparse_no_value_tl } }
              }
          }
      }
  }
\cs_new:Npn \__xparse_split_argument_aux:n #1
  { \prg_replicate:nn {#1} { \__xparse_split_argument_aux:wn } }
\cs_new:Npn \__xparse_split_argument_aux:wn #1 \use_none_delimit_by_q_stop:w #2
  {
    \exp_not:n { {#2} }
    #1
    \use_none_delimit_by_q_stop:w
  }
\cs_new_protected:Npn \__xparse_trim_spaces:n #1
  { \tl_set:Nx \ProcessedArgument { \tl_trim_spaces:n {#1} } }
\cs_new_protected:Npn \__xparse_get_arg_spec:N #1
  {
    \prop_get:NnNF \l__xparse_command_arg_specs_prop {#1}
      \ArgumentSpecification
      {
        \__msg_kernel_error:nnx { xparse } { unknown-document-command }
          { \token_to_str:N #1 }
      }
  }
\cs_new_protected:Npn \__xparse_get_arg_spec:n #1
  {
    \prop_get:NnNF \l__xparse_environment_arg_specs_prop {#1}
      \ArgumentSpecification
      {
        \__msg_kernel_error:nnx { xparse } { unknown-document-environment }
          { \tl_to_str:n {#1} }
      }
  }
\tl_new:N \ArgumentSpecification
\cs_new_protected:Npn \__xparse_show_arg_spec:N #1
  {
    \prop_get:NnNTF \l__xparse_command_arg_specs_prop {#1}
      \ArgumentSpecification
      { \tl_show:N \ArgumentSpecification }
      {
        \__msg_kernel_error:nnx { xparse } { unknown-document-command }
          { \token_to_str:N #1 }
      }
  }
\cs_new_protected:Npn \__xparse_show_arg_spec:n #1
  {
    \prop_get:NnNTF \l__xparse_environment_arg_specs_prop {#1}
      \ArgumentSpecification
      { \tl_show:N \ArgumentSpecification }
      {
        \__msg_kernel_error:nnx { xparse } { unknown-document-environment }
          { \tl_to_str:n {#1} }
      }
  }
\group_begin:
\char_set_lccode:nn { `\Q } { `\- }
\char_set_lccode:nn { `\F } { `\F }
\char_set_lccode:nn { `\N } { `\N }
\char_set_lccode:nn { `\T } { `\T }
\char_set_lccode:nn { `\V } { `\V }
\tl_to_lowercase:n
  {
    \group_end:
    \prg_new_conditional:Npnn \__xparse_if_no_value:n #1 { T ,  F , TF }
      {
        \str_if_eq:onTF
          { \__xparse_if_value_aux:w ? #1 { } QNoValue- }
          { ? { } QNoValue- }
          { \prg_return_true: }
          { \prg_return_false: }
      }
    \cs_new:Npn \__xparse_if_value_aux:w #1 QNoValue- { #1 }
  }
\__msg_kernel_new:nnnn { xparse } { bad-arg-spec }
  { Bad~argument~specification~'#1'. }
  {
    \c_msg_coding_error_text_tl
    The~argument~specification~provided~was~not~valid:~
    one~or~more~mandatory~pieces~of~information~were~missing. \\ \\
    LaTeX~will~ignore~this~entire~definition.
  }
\__msg_kernel_new:nnnn { xparse } { command-already-defined }
  { Command~'#1'~already~defined! }
  {
    You~have~used~\NewDocumentCommand
    with~a~command~that~already~has~a~definition. \\
    The~existing~definition~of~'#1'~will~be~overwritten.
  }
\__msg_kernel_new:nnnn { xparse } { command-not-yet-defined }
  { Command ~'#1'~not~yet~defined! }
  {
    You~have~used~\RenewDocumentCommand
    with~a~command~that~was~never~defined.\\
    A~new~command~'#1'~will~be~created.
  }
\__msg_kernel_new:nnnn { xparse } { environment-already-defined }
  { Environment~'#1'~already~defined! }
  {
    You~have~used~\NewDocumentEnvironment
    with~an~environment~that~already~has~a~definition.\\
    The~existing~definition~of~'#1'~will~be~overwritten.
  }
\__msg_kernel_new:nnnn { xparse } { environment-mismatch }
  { Mismatch~between~start~and~end~of~environment. }
  {
    The~current~environment~is~called~'#1',~but~you~have~tried~to~
    end~one~called~'#2'.~Environments~have~to~be~properly~nested.
  }
\__msg_kernel_new:nnnn { xparse } { environment-not-yet-defined }
  { Environment~'#1'~not~yet~defined! }
  {
    You~have~used~\RenewDocumentEnvironment
    with~an~environment~that~was~never~defined.\\
    A~new~environment~'#1'~will~be~created.
  }
\__msg_kernel_new:nnnn { xparse } { environment-unknown }
  { Environment~'#1'~undefined. }
  {
    You~have~tried~to~start~an~environment~called~'#1',~
    but~this~has~never~been~defined.\\
    The~command~will~be~ignored.
  }
\__msg_kernel_new:nnnn { xparse } { expandable-ending-optional }
  { Argument~specification~for~expandable~command~ends~with~optional~argument. }
  {
    \c_msg_coding_error_text_tl
    Expandable~commands~must~have~a~final~mandatory~argument~
    (or~no~arguments~at~all).~You~cannot~have~a~terminal~optional~
    argument~with~expandable~commands.
  }
\__msg_kernel_new:nnnn { xparse } { inconsistent-long }
  { Inconsistent~long~arguments~for~expandable~command. }
  {
    \c_msg_coding_error_text_tl
    The~arguments~for~an~expandable~command~must~either~all~be~
    short~or~all~be~long.~You~have~tried~to~mix~the~two~types.
  }
\__msg_kernel_new:nnnn { xparse } { invalid-expandable-argument-type }
  { Argument~type~'#1'~not~available~for~an~expandable~function. }
  {
    \c_msg_coding_error_text_tl
    The~letter~'#1'~does~not~specify~an~argument~type~which~can~be~used~
    in~an~expandable~function.
    \\ \\
    LaTeX~will~assume~you~want~a~standard~mandatory~argument~(type~'m').
  }
\__msg_kernel_new:nnnn { xparse } { missing-required }
  { Failed~to~find~required~argument~starting~with~'#1'. }
  {
    There~is~supposed~to~be~an~argument~to~the~current~function~starting~with~
    '#1'.~LaTeX~did~not~find~it,~and~will~insert~'#2'~as~the~value~to~be~
    processed.
  }
\__msg_kernel_new:nnnn { xparse } { not-single-token }
  { Argument~delimiter~should~be~a~single~token:~'#1'. }
  {
    \c_msg_coding_error_text_tl
    The~argument~specification~provided~was~not~valid:~
    in~a~place~where~a~single~token~is~required,~LaTeX~found~'#1'. \\ \\
    LaTeX~will~ignore~this~entire~definition.
  }
\__msg_kernel_new:nnnn { xparse } { processor-in-expandable }
  { Argument~processors~cannot~be~used~with~expandable~functions. }
  {
    \c_msg_coding_error_text_tl
    The~argument~specification~for~#1~contains~a~processor~function:~
    this~is~only~supported~for~standard~robust~functions.
  }
\__msg_kernel_new:nnnn { xparse } { split-excess-tokens }
  { Too~many~'#1'~tokens~when~trying~to~split~argument. }
  {
    LaTeX~was~asked~to~split~the~input~'#3'~
    at~each~occurrence~of~the~token~'#1',~up~to~a~maximum~of~#2~parts.~
    There~were~too~many~'#1'~tokens.
  }
\__msg_kernel_new:nnnn { xparse } { unknown-argument-type }
  { Unknown~argument~type~'#1'~replaced~by~'m'. }
  {
    \c_msg_coding_error_text_tl
    The~letter~'#1'~does~not~specify~a~known~argument~type.~
    LaTeX~will~assume~you~want~a~standard~mandatory~argument~(type~'m').
  }
\__msg_kernel_new:nnnn { xparse } { unknown-document-command }
  { Unknown~document~command~'#1'. }
  {
    You~have~asked~for~the~argument~specification~for~a~command~'#1',~
    but~this~is~not~a~document~command.
  }
\__msg_kernel_new:nnnn { xparse } { unknown-document-environment }
  { Unknown~document~environment~'#1'. }
  {
    You~have~asked~for~the~argument~specification~for~a~command~'#1',~
    but~this~is~not~a~document~environment.
  }
\__msg_kernel_new:nnnn { xparse } { verbatim-newline }
  { Verbatim~argument~of~#1~ended~by~end~of~line. }
  {
    The~verbatim~argument~of~#1~cannot~contain~more~than~one~line,~but~the~end~
    of~the~current~line~has~been~reached.~You~have~probably~forgotten~the~
    closing~delimiter.
    \\ \\
    LaTeX~will~ignored~'#2'.
  }
\__msg_kernel_new:nnnn { xparse } { verbatim-already-tokenized }
  { Verbatim~command~#1~illegal~in~command~argument. }
  {
    The~command~#1~takes~a~verbatim~argument.~It~may~not~appear~within~
    the~argument~of~another~function.
    \\ \\
    LaTeX~will~ignore~'#2'.
  }
\__msg_kernel_new:nnn { xparse } { define-command }
  {
    Defining~document~command~#1~
    with~arg.~spec.~'#2'~\msg_line_context:.
  }
\__msg_kernel_new:nnn { xparse } { define-environment }
  {
    Defining~document~environment~'#1'~
    with~arg.~spec.~'#2'~\msg_line_context:.
  }
\__msg_kernel_new:nnn { xparse } { redefine-command }
  {
    Redefining~document~command~#1~
    with~arg.~spec.~'#2'~\msg_line_context:.
  }
\__msg_kernel_new:nnn { xparse } { redefine-environment }
  {
    Redefining~document~environment~'#1'~
    with~arg.~spec.~'#2'~\msg_line_context:.
  }
\cs_new_eq:NN \BooleanFalse \c_false_bool
\cs_new_eq:NN \BooleanTrue  \c_true_bool
\cs_new_protected:Npn \DeclareDocumentCommand #1#2#3
  { \__xparse_declare_cmd:Nnn #1 {#2} {#3} }
\cs_new_protected:Npn \NewDocumentCommand #1#2#3
  {
    \cs_if_exist:NTF #1
      {
        \__msg_kernel_error:nnx { xparse } { command-already-defined }
          { \token_to_str:N #1 }
      }
      { \__xparse_declare_cmd:Nnn #1 {#2} {#3} }
  }
\cs_new_protected:Npn \RenewDocumentCommand #1#2#3
  {
    \cs_if_exist:NTF #1
      { \__xparse_declare_cmd:Nnn #1 {#2} {#3} }
      {
        \__msg_kernel_error:nnx { xparse } { command-not-yet-defined }
          { \token_to_str:N #1 }
      }
  }
\cs_new_protected:Npn \ProvideDocumentCommand #1#2#3
  { \cs_if_exist:NF #1 { \__xparse_declare_cmd:Nnn #1 {#2} {#3} } }
\cs_new_protected:Npn \DeclareDocumentEnvironment #1#2#3#4
  { \__xparse_declare_env:nnnn {#1} {#2} {#3} {#4} }
\cs_new_protected:Npn \NewDocumentEnvironment #1#2#3#4
  {
    \cs_if_exist:cTF {#1}
      { \__msg_kernel_error:nnx { xparse } { environment-already-defined } {#1} }
      { \__xparse_declare_env:nnnn {#1} {#2} {#3} {#4} }
}
\cs_new_protected:Npn \RenewDocumentEnvironment #1#2#3#4
  {
    \cs_if_exist:cTF {#1}
      { \__xparse_declare_env:nnnn {#1} {#2} {#3} {#4} }
      { \__msg_kernel_error:nnx { xparse } { environment-not-yet-defined } {#1} }
  }
\cs_new_protected:Npn \ProvideDocumentEnvironment #1#2#3#4
  { \cs_if_exist:cF { #1 } { \__xparse_declare_env:nnnn {#1} {#2} {#3} {#4} } }
\cs_new_protected:Npn \DeclareExpandableDocumentCommand #1#2#3
  { \__xparse_declare_expandable_cmd:Nnn #1 {#2} {#3} }
\cs_new_eq:NN \IfBooleanTF \bool_if:NTF
\cs_new_eq:NN \IfBooleanT  \bool_if:NT
\cs_new_eq:NN \IfBooleanF  \bool_if:NF
\cs_new_eq:NN \IfNoValueF  \__xparse_if_no_value:nF
\cs_new_eq:NN \IfNoValueT  \__xparse_if_no_value:nT
\cs_new_eq:NN \IfNoValueTF \__xparse_if_no_value:nTF
\cs_set:Npn \IfValueF { \__xparse_if_no_value:nT }
\cs_set:Npn \IfValueT { \__xparse_if_no_value:nF }
\cs_set:Npn \IfValueTF #1#2#3 { \__xparse_if_no_value:nTF {#1} {#3} {#2} }
\tl_new:N \ProcessedArgument
\cs_new_eq:NN \ReverseBoolean \__xparse_bool_reverse:N
\cs_new_eq:NN \SplitArgument  \__xparse_split_argument:nnn
\cs_new_eq:NN \SplitList      \__xparse_split_list:nn
\cs_new_eq:NN \TrimSpaces     \__xparse_trim_spaces:n
\cs_new_eq:NN \ProcessList \tl_map_function:nN
\cs_new_eq:NN \GetDocumentCommandArgSpec      \__xparse_get_arg_spec:N
\cs_new_eq:NN \GetDocumentEnvironmmentArgSpec \__xparse_get_arg_spec:n
\cs_new_eq:NN \ShowDocumentCommandArgSpec     \__xparse_show_arg_spec:N
\cs_new_eq:NN \ShowDocumentEnvironmentArgSpec \__xparse_show_arg_spec:n
\clist_new:N \l__xparse_options_clist
\DeclareOption* { \clist_put_right:NV \l__xparse_options_clist \CurrentOption }
\ProcessOptions \relax
\keys_define:nn { xparse }
  {
    log-declarations .bool_set:N = \l__xparse_log_bool ,
    log-declarations .initial:n  = true
  }
\keys_set:nV { xparse } \l__xparse_options_clist
\bool_if:NF \l__xparse_log_bool
  {
    \msg_redirect_module:nnn { LaTeX / xparse } { info }    { none }
    \msg_redirect_module:nnn { LaTeX / xparse } { warning } { none }
  }
%% 
%%
%% End of file `xparse.sty'.