%%
%% This is file `witharrows.sty',
%% generated with the docstrip utility.
%%
%% The original source files were:
%%
%% witharrows.dtx  (with options: `package')
%% 
%% Copyright (C) 2017-2018 by F. Pantigny
%% 
%% This file may be distributed and/or modified under the
%% conditions of the LaTeX Project Public License, either
%% version 1.3 of this license or (at your option) any later
%% version.  The latest version of this license is in:
%% 
%%      http://www.latex-project.org/lppl.txt
%% 
%% and version 1.3 or later is part of all distributions of
%% LaTeX version 2005/12/01 or later.
%% 
\def\myfileversion{1.10}
\def\myfiledate{2018/09/13}
\RequirePackage{tikz}
\usetikzlibrary{arrows.meta,bending}
\RequirePackage{l3keys2e}
\ProvidesExplPackage
  {witharrows}
  {\myfiledate}
  {\myfileversion}
  {Draws arrows for explanations on the right}
\RequirePackage{xparse}
\bool_new:N \g__ww_footnotehyper_bool
\bool_new:N \g__ww_footnote_bool
\int_new:N \l__ww_level_int
\keys_define:nn {WithArrows/package}
      {footnote      .bool_gset:N = \g__ww_footnote_bool,
       footnotehyper .bool_gset:N = \g__ww_footnotehyper_bool,
       unknown       .code:n      = \msg_fatal:nn {witharrows}
                                         {Option~unknown~for~package}}
\msg_new:nnn {witharrows}
             {Option~unknown~for~package}
             {You~can't~use~the~option~"\tl_use:N\l_keys_key_tl"~when~loading~the~
              package~witharrows.}
\ProcessKeysOptions {WithArrows/package}
\msg_new:nnn {witharrows}
             {Option~incompatible~with~Beamer}
             {The~option~"\tl_use:N \l_keys_key_tl"\ is~incompatible~
              with~Beamer~because~Beamer~has~its~own~system~to~extract~footnotes.}
\msg_new:nnn {witharrows}
             {footnote~with~footnotehyper~package}
             {You~can't~use~the~option~footnote~because~the~package~
              footnotehyper~has~already~been~loaded.~
              If~you~want,~you~can~use~the~option~"footnotehyper"~and~the~footnotes~
              within~the~environments~{WithArrows}~will~be~extracted~with~the~tools~
              of~the~package~footnotehyper.}
\msg_new:nnn {witharrows}
             {footnotehyper~with~footnote~package}
             {You~can't~use~the~option~"footnotehyper"~because~the~package~
              footnote~has~already~been~loaded.~
              If~you~want,~you~can~use~the~option~"footnote"~and~the~footnotes~
              within~the~environments~{WithArrows}~will~be~extracted~with~the~tools~
              of~the~package~footnote.}
\bool_if:NT \g__ww_footnote_bool
      {\@ifclassloaded {beamer}
                {\msg_fatal:nn {witharrows}
                               {Option~incompatible~with~Beamer}}
                {}
       \@ifpackageloaded{footnotehyper}
           {\msg_fatal:nn {witharrows}
                          {footnote~with~footnotehyper~package}}
           {}
       \usepackage{footnote}}
\bool_if:NT \g__ww_footnotehyper_bool
      {\@ifclassloaded {beamer}
                {\msg_fatal:nn {witharrows}
                               {Option~incompatible~with~Beamer}}
                {}
       \@ifpackageloaded{footnote}
           {\msg_fatal:nn {witharrows}
                          {footnotehyper~with~footnote~package}}
           {}
       \usepackage{footnotehyper}
       \bool_gset_true:N \g__ww_footnote_bool}
\bool_new:N \c__ww_leqno_bool
\DeclareOption {leqno} {\bool_set_true:N \c__ww_leqno_bool}
\DeclareOption* {}
\ProcessOptions \relax
\cs_new_protected:Nn \__ww_msg_error:n
        {\msg_error:nn {witharrows} {#1}}
\AtBeginDocument{\clist_map_inline:nn
                    {amsmath,mathtools,autonum,cleveref,hyperref,typedref}
                    {\bool_new:c {c__ww_#1_loaded_bool}
                     \@ifpackageloaded {#1}
                           {\bool_set_true:c {c__ww_#1_loaded_bool}}
                           {}}}
\tikzset{__ww_node_style/.style= {
               above = \l__ww_ystart_dim,
               inner~sep = 0 pt,
               minimum~width = 0pt,
               minimum~height = \l__ww_ygap_dim,
               red,
               \bool_if:NT \l__ww_shownodes_bool {draw} }}
\tikzset{__ww_standard/.style= { remember~picture,
                               overlay,
                               name~prefix = wa-\l__ww_prefix_str- }}
\tikzset{WithArrows/arrow/tips/.style = { > = {Straight~Barb[scale=1.2,bend]} }}
\tikzset{WithArrows/arrow/.style  = { align = left,
                                      auto = left,
                                      font = \small\itshape,
                                      WithArrows/arrow/tips,
                                      bend~left = 45,
                                      -> }}
\AtBeginDocument
    {\bool_if:NF \c__ww_amsmath_loaded_bool
       {\cs_set_protected:Npn \spread@equation
           {\openup\jot
            \cs_set_protected:Npn \spread@equation {}}}}
\bool_new:N \l__ww_in_witharrows_bool
\seq_new:N \g__ww_position_in_the_tree_seq
\seq_gput_right:Nn \g__ww_position_in_the_tree_seq 1
\int_new:N \g__ww_last_env_int
\skip_new:N \l__ww_interline_skip
\int_new:N \l__ww_pos_env_int
\dim_new:N \l__ww_xoffset_dim
\dim_set:Nn \l__ww_xoffset_dim {3mm}
\int_new:N \l__ww_pos_arrows_int
\int_new:N \l__ww_previous_pos_arrows_int
\dim_new:N \g__ww_x_dim
\seq_new:N \g__ww_arrow_int_seq
\int_new:N \g__ww_arrow_int
\seq_new:N \g__ww_line_int_seq
\int_new:N \g__ww_line_int
\seq_new:N \g__ww_line_bis_int_seq
\int_new:N \g__ww_line_bis_int
\tl_new:N \l__ww_name_tl
\bool_new:N \l__ww_notag_bool
\tl_new:N \l__ww_tag_tl
\bool_new:N \l__ww_tag_star_bool
\seq_new:N \l__ww_labels_seq
\cs_set:Nn \__ww_label:n {\seq_if_empty:NF \l__ww_labels_seq
                           {\__ww_msg_error:n {Multiple~labels}}
                        \seq_put_right:Nn \l__ww_labels_seq {#1}
                        \bool_if:nT \c__ww_mathtools_loaded_bool
                           {\MH_if_boolean:nT {show_only_refs}
                               {\cs_if_exist:cTF {MT_r_#1}
                                 {\bool_set_false:N \l__ww_notag_bool}
                                 {\bool_set_true:N \l__ww_notag_bool}}}
                        \bool_if:nT \c__ww_autonum_loaded_bool
                               {\cs_if_exist:cTF {autonum@#1Referenced}
                                 {\bool_set_false:N \l__ww_notag_bool}
                                 {\bool_set_true:N \l__ww_notag_bool}}}
\bool_new:N \l__ww_fleqn_bool
\dim_new:N \l__ww_mathindent_dim
\dim_set:Nn \l__ww_mathindent_dim {25pt}
\bool_new:N \l__ww_wrap_lines_bool
\int_set:Nn \l__ww_level_int 1
\keys_define:nn {WithArrows/GlobalOrEnv}
   {  t   .code:n            = {\bool_if:NTF \l__ww_in_witharrows_bool
                                 {\int_set:Nn \l__ww_pos_env_int 0}
                                 {\__ww_msg_error:n {Option~will~be~ignored}}},
      t   .value_forbidden:n = true,
      c   .code:n            = {\bool_if:NTF \l__ww_in_witharrows_bool
                                 {\int_set:Nn \l__ww_pos_env_int 1}
                                 {\__ww_msg_error:n {Option~will~be~ignored}}},
      c   .value_forbidden:n = true,
      b   .code:n            = {\bool_if:NTF \l__ww_in_witharrows_bool
                                 {\int_set:Nn \l__ww_pos_env_int 2}
                                 {\__ww_msg_error:n {Option~will~be~ignored}}},
      b   .value_forbidden:n = true,
      ygap .dim_set:N        = \l__ww_ygap_dim,
      ygap .value_required:n = true,
      ygap .initial:n        = 0.4 ex,
      ystart .dim_set:N        = \l__ww_ystart_dim,
      ystart .value_required:n = true,
      ystart .initial:n        = 0.4 ex,
      MoreColumns .code:n            = { \msg_redirect_name:nnn
                                         {witharrows}
                                         {Third~column~in~an~environment~{WithArrows}}
                                         {none} },
      MoreColumns .value_forbidden:n = true,
      AllowLineWithoutAmpersand .code:n = { \msg_redirect_name:nnn
                                            {witharrows}
                                            {All~lines~must~have~an~ampersand}
                                            {none} },
      AllowLineWithoutAmpersand .value_forbidden:n = true,
      CommandName .tl_set:N         = \l__ww_CommandName_tl,
      CommandName .initial:n        = Arrow ,
      CommandName .value_required:n = true,
      TikzCode .tl_set:N         = \l__ww_tikz_code_tl,
      TikzCode .initial:n        = \draw~(#1)~to~node{#3}~(#2)~; ,
      TikzCode .value_required:n = true,
      displaystyle .bool_set:N     = \l__ww_displaystyle_bool,
      displaystyle .initial:n      = false,
      shownodes .bool_set:N        = \l__ww_shownodes_bool,
      shownodes .initial:n         = false,
      shownodenames .bool_set:N    = \l__ww_shownodenames_bool,
      shownodenames .initial:n     = false,
      group    .code:n    = {\int_compare:nNnT \l__ww_previous_pos_arrows_int > {-1}
                                    {\__ww_msg_error:n {Two~options~are~incompatible}}
                             \int_set:Nn \l__ww_previous_pos_arrows_int 6
                             \int_set:Nn \l__ww_pos_arrows_int 6} ,
      group    .value_forbidden:n = true,
      groups   .code:n   = {\int_compare:nNnT \l__ww_previous_pos_arrows_int > {-1}
                                   {\__ww_msg_error:n {Two~options~are~incompatible}}
                            \int_set:Nn \l__ww_previous_pos_arrows_int 7
                            \int_set:Nn \l__ww_pos_arrows_int 7} ,
      groups   .value_forbidden:n = true,
      CodeBefore  .code:n = {\int_compare:nNnTF \l__ww_level_int = 1
                              {\__ww_msg_error:n {Option~will~be~ignored}}
                              {\tl_put_right:Nn \l__ww_code_before_tl {#1}}} ,
      CodeBefore  .value_required:n = true,
      CodeAfter .code:n = {\int_compare:nNnTF \l__ww_level_int = 1
                              {\__ww_msg_error:n {Option~will~be~ignored}}
                              {\tl_put_right:Nn \l__ww_code_after_tl {#1}}} ,
      CodeAfter .value_required:n = true,
      name .code:n = {\int_compare:nNnTF \l__ww_level_int = 1
                              {\__ww_msg_error:n {Option~will~be~ignored}}
                              {\tl_set:Nn \l__ww_name_tl {#1}}} ,
      name .value_required:n = true,
      fleqn   .code:n = {\bool_if:NTF \l__ww_in_witharrows_bool
                             {\__ww_msg_error:n {Option~will~be~ignored}}
                             {\tl_if_eq:nnTF {#1} {true}
                                 {\bool_set_true:N \l__ww_fleqn_bool}
                                 {\bool_set_false:N \l__ww_fleqn_bool}}},
      fleqn   .default:n = true,
      mathindent   .code:n = {\bool_if:NTF \l__ww_in_witharrows_bool
                               {\__ww_msg_error:n {Option~will~be~ignored}}
                               {\dim_set:Nn \l__ww_mathindent_dim {#1}}},
      mathindent   .value_required:n = true,
      notag   .code:n = {\bool_if:NTF \l__ww_in_witharrows_bool
                             {\__ww_msg_error:n {Option~will~be~ignored}}
                             {\tl_if_eq:nnTF {#1} {true}
                                 {\bool_set_true:N \l__ww_notag_bool}
                                 {\bool_set_false:N \l__ww_notag_bool}}},
      notag   .default:n = true,
      nonumber .meta:n   = notag,
      AllowMultipleLabels .code:n = {\bool_if:NTF \l__ww_in_witharrows_bool
                                         {\__ww_msg_error:n {Option~will~be~ignored}}
                                         {\msg_redirect_name:nnn {witharrows}
                                                           {Multiple~labels}
                                                           {none}}},
      AllowMultipleLabels .value_forbidden:n = true,
      wrap-lines   .code:n = {\bool_if:NTF \l__ww_in_witharrows_bool
                             {\__ww_msg_error:n {Option~will~be~ignored}}
                             {\tl_if_eq:nnTF {#1} {true}
                                 {\bool_set_true:N \l__ww_wrap_lines_bool}
                                 {\bool_set_false:N \l__ww_wrap_lines_bool}}},
      wrap-lines   .default:n = true,
      unknown .code:n  = \__ww_msg_error:n {Option~unknown}
     }
\keys_define:nn {WithArrows/General}
     {tikz     .code:n            = \tikzset {WithArrows/arrow/.append~style = {#1}},
      tikz     .initial:n         = {},
      tikz     .value_required:n  = true,
      rr       .value_forbidden:n = true,
      rr       .code:n            = \__ww_analyze_option_position:n 0 ,
      ll       .value_forbidden:n = true,
      ll       .code:n            = \__ww_analyze_option_position:n 1 ,
      rl       .value_forbidden:n = true,
      rl       .code:n            = \__ww_analyze_option_position:n 2 ,
      lr       .value_forbidden:n = true,
      lr       .code:n            = \__ww_analyze_option_position:n 3 ,
      i        .value_forbidden:n = true,
      i        .code:n            = \__ww_analyze_option_position:n 5 ,
      xoffset  .code:n  = {\bool_if:nTF {\int_compare_p:nNn \l__ww_level_int = 3 &&
                                        \int_compare_p:nNn \l__ww_pos_arrows_int > 5}
                               {\__ww_msg_error:n {Option~incompatible~with~"group(s)"}}
                               {\dim_set:Nn \l__ww_xoffset_dim {#1}}} ,
      xoffset  .value_required:n  = true,
      jot       .code:n     = {\int_compare:nNnTF \l__ww_level_int = 2
                                  {\dim_set:Nn \jot {#1}}
                                  {\__ww_msg_error:n {Option~will~be~ignored}}} ,
      jot       .value_required:n  = true,
      interline   .code:n       = {\int_compare:nNnTF \l__ww_level_int = 2
                                      {\skip_set:Nn \l__ww_interline_skip {#1}}
                                      {\__ww_msg_error:n {Option~will~be~ignored}}} ,
      interline   .value_required:n = true,
      jump    .code:n  = \__ww_msg_error:n {Option~will~be~ignored} ,
      unknown .code:n  = \__ww_msg_error:n {Option~unknown}
}
\keys_define:nn {WithArrows/jump}
     {jump  .code:n = {\int_set:Nn \l__ww_jump_int {#1}
                       \int_compare:nNnF \l__ww_jump_int > 0
                           {\__ww_msg_error:n {The~option~"jump"~must~be~non~negative}}} ,
      jump  .value_required:n  = true}
\cs_new_protected:Nn \__ww_analyze_option_position:n
     {\int_compare:nNnT \l__ww_previous_pos_arrows_int > {-1}
        {\__ww_msg_error:n {Two~options~are~incompatible}}
      \int_set:Nn \l__ww_previous_pos_arrows_int {#1}
      \bool_if:nTF { \int_compare_p:nNn \l__ww_level_int = 3 &&
                     \int_compare_p:nNn \l__ww_pos_arrows_int > 5}
         {\__ww_msg_error:n {Option~incompatible~with~"group(s)"}}
         {\int_set:Nn \l__ww_pos_arrows_int {#1}}}
\NewDocumentCommand \WithArrowsOptions {m}
    {\int_set:Nn \l__ww_previous_pos_arrows_int {-1}
     \keys_set_known:nnN {WithArrows/General} {#1} \l_tmpa_tl
     \keys_set:nV {WithArrows/GlobalOrEnv} \l_tmpa_tl}
\NewDocumentCommand \__ww_Arrow {O{} m O{}}
         {
          \int_gincr:N \g__ww_arrow_int
          \int_zero_new:N \l__ww_jump_int
          \int_set:Nn \l__ww_jump_int 1
          \keys_set_known:nnN {WithArrows/jump} {#1,#3} \l_tmpa_tl
          \prop_put:NnV \l_tmpa_prop {initial} \g__ww_line_int
          \int_set:Nn \l_tmpa_int {\g__ww_line_int + \l__ww_jump_int}
          \prop_put:NnV \l_tmpa_prop {final} \l_tmpa_int
          \prop_put:NnV \l_tmpa_prop {options} \l_tmpa_tl
          \prop_put:Nnn \l_tmpa_prop {label} {#2}
          \prop_gclear_new:c
                {g__ww_arrow_\l__ww_prefix_str _\int_use:N\g__ww_arrow_int _prop}
          \prop_gset_eq:cN
                {g__ww_arrow_\l__ww_prefix_str _\int_use:N\g__ww_arrow_int _prop}
                \l_tmpa_prop
          }
\cs_new_protected:Nn \__ww_Arrow_first_column:
               {\tl_set:Nn \l_tmpa_tl {Arrow}
                \__ww_msg_error:n {Arrow~in~first~column}
                \__ww_Arrow}
\cs_new_protected:Nn \__ww_pre_environment:n
         { \seq_gput_right:NV \g__ww_arrow_int_seq \g__ww_arrow_int
           \int_gzero:N \g__ww_arrow_int
           \seq_gput_right:NV \g__ww_line_int_seq \g__ww_line_int
           \int_gzero:N \g__ww_line_int
           \seq_gput_right:NV \g__ww_line_bis_int_seq \g__ww_line_bis_int
           \int_gzero:N \g__ww_line_bis_int
           \seq_gput_right:Nn \g__ww_position_in_the_tree_seq 1
           \seq_set_eq:NN \l_tmpa_seq \g__ww_position_in_the_tree_seq
           \seq_pop_right:NN \l_tmpa_seq \l_tmpa_tl
           \str_clear_new:N \l__ww_prefix_str
           \str_set:Nx \l__ww_prefix_str {\seq_use:Nnnn \l_tmpa_seq {-} {-} {-}}
           \cs_set_eq:NN \\ \__ww_cr:
           \dim_zero:N \mathsurround
           \int_zero_new:N \l__ww_initial_int
           \int_zero_new:N \l__ww_final_int
           \int_zero_new:N \l__ww_arrow_int
           \skip_zero:N \l__ww_interline_skip
           \tl_clear_new:N \l__ww_code_before_tl
           \tl_clear_new:N \l__ww_code_after_tl
           \int_set:Nn \l__ww_previous_pos_arrows_int {-1}
           \int_set:Nn \l__ww_level_int 2
           \keys_set_known:nnN {WithArrows/General} {#1} \l_tmpa_tl
           \keys_set:nV {WithArrows/GlobalOrEnv} \l_tmpa_tl
           \bool_if:NT \g__ww_footnote_bool {\begin{savenotes}}
           \l__ww_code_before_tl
           \cs_set_eq:cN \l__ww_CommandName_tl \__ww_Arrow}
\NewDocumentEnvironment {WithArrows} {O{}}
         { \bool_set_true:N \l__ww_in_witharrows_bool
           \reverse_if:N \if_mode_math:
                             \__ww_msg_error:n {{WithArrows}~used~outside~math~mode}
                         \fi:
           \cs_set:Npn \notag {\msg_error:nnn {witharrows}
                                              {Command~not~allowed~in~{WithArrows}}
                                              {\notag}}
           \cs_set:Npn \nonumber {\msg_error:nnn {witharrows}
                                                 {Command~not~allowed~in~{WithArrows}}
                                                 {\nonumber}}
           \cs_set:Npn \tag ##1 {\msg_error:nnn {witharrows}
                                                {Command~not~allowed~in~{WithArrows}}
                                                {\tag}}
           \cs_set:Npn \label ##1 {\msg_error:nnn {witharrows}
                                                  {Command~not~allowed~in~{WithArrows}}
                                                  {\label}}
           \__ww_pre_environment:n {#1}
           \int_case:nn \l__ww_pos_env_int
                   {0 {\vtop}
                    1 {\vcenter}
                    2 {\vbox}}
           \bgroup
           \spread@equation
           \ialign\bgroup
           \int_gincr:N \g__ww_line_int
           \cs_set_eq:cN \l__ww_CommandName_tl \__ww_Arrow_first_column:
           \strut\hfil
           $\bool_if:NT \l__ww_displaystyle_bool \displaystyle {##}$
           &
           \int_gincr:N \g__ww_line_bis_int
           $\bool_if:NT \l__ww_displaystyle_bool \displaystyle {{}##}$
           \tikz [remember~picture,overlay]
                 \node [__ww_node_style,
                        name = wa-\l__ww_prefix_str-\int_use:N\g__ww_line_int-l,
                        alias = {\tl_if_empty:NF \l__ww_name_tl
                                     {\l__ww_name_tl-\int_use:N\g__ww_line_int-l}} ] {} ;
           \hfil
           \tikz [remember~picture,overlay]
                 \node [__ww_node_style,
                        name = wa-\l__ww_prefix_str-\int_use:N\g__ww_line_int-r,
                        alias = {\tl_if_empty:NF \l__ww_name_tl
                                   {\l__ww_name_tl-\int_use:N\g__ww_line_int-r}} ] {} ;
           \bool_if:NT \l__ww_shownodenames_bool
                {\hbox_overlap_right:n {\small wa-\l__ww_prefix_str
                                                 -\int_use:N\g__ww_line_int}}
           && \__ww_msg_error:n {Third~column~in~an~environment~{WithArrows}}
           $\bool_if:NT \l__ww_displaystyle_bool \displaystyle {##}$
           \cr
          }
          {\crcr
           \egroup
           \egroup
           \__ww_post_environment:
           \bool_if:NT \g__ww_footnote_bool {\end{savenotes}}
}
\cs_new_protected:Nn \__ww_post_environment:
          {\int_compare:nNnT \g__ww_line_bis_int < \g__ww_line_int
                  {\__ww_msg_error:n {All~lines~must~have~an~ampersand}}
           \int_compare:nNnT \g__ww_arrow_int > 0
                  {\int_compare:nNnTF \l__ww_pos_arrows_int > 5
                    \__ww_draw_arrows:
                    {\__ww_draw_arrows:nn 1 \g__ww_arrow_int}}
           \group_begin:
           \tikzset{every~picture/.style = __ww_standard}
           \cs_set:Npn \NbLines {\int_use:N \g__ww_line_int}
           \cs_set_eq:NN \MultiArrow \__ww_MultiArrow:nn
           \cs_set_eq:cN \l__ww_CommandName_tl \__ww_Arrow_code_after
           \l__ww_code_after_tl
           \group_end:
           \seq_gpop_right:NN \g__ww_position_in_the_tree_seq \l_tmpa_tl
           \seq_gpop_right:NN \g__ww_position_in_the_tree_seq \l_tmpa_tl
           \seq_gput_right:Nx \g__ww_position_in_the_tree_seq {\int_eval:n {\l_tmpa_tl+1}}
           \int_compare:nNnT {\seq_count:N \g__ww_position_in_the_tree_seq} = 1
                      {\int_gincr:N \g__ww_last_env_int}
           \seq_gpop_right:NN \g__ww_arrow_int_seq {\l_tmpa_tl}
           \int_gset:Nn \g__ww_arrow_int {\l_tmpa_tl}
           \seq_gpop_right:NN \g__ww_line_int_seq \l_tmpa_tl
           \int_gset:Nn \g__ww_line_int {\l_tmpa_tl}
           \seq_gpop_right:NN \g__ww_line_bis_int_seq \l_tmpa_tl
           \int_gset:Nn \g__ww_line_bis_int {\l_tmpa_tl}
           }
\cs_new_protected:Nn \__ww_cr:
      {\scan_stop:
       \group_align_safe_begin:
       \peek_meaning_remove:NTF * \__ww_cr_i: \__ww_cr_i:}
\cs_new_protected:Nn \__ww_cr_i:
      {\peek_meaning:NTF [ {\__ww_cr_ii:} {\__ww_cr_ii:[\c_zero_dim]} }
\cs_new_protected:Npn \__ww_cr_ii:[#1]
      {\group_align_safe_end:
       \bool_if:NF \l__ww_in_witharrows_bool
           {\bool_if:NTF \l__ww_notag_bool
                {& \tikz [__ww_standard] \coordinate (\int_use:N\g__ww_line_int-v)  ; }
                {
                 \tl_if_empty:NT \l__ww_tag_tl
                    {\int_gincr:N \c@equation}
                 \cs_gset:Npx \g_tmpa_tl
                      {\tl_if_empty:NTF \l__ww_tag_tl
                          \theequation
                          \l__ww_tag_tl}
                 \seq_if_empty:NF \l__ww_labels_seq
                      {
                       \cs_set:Npx \@currentlabel {\p@equation \g_tmpa_tl}
                       \bool_if:NT \c__ww_hyperref_loaded_bool
                            {\cs_set:Npn \This@name {equation}
                             \hyper@refstepcounter{equation}}
                       \bool_if:NT \c__ww_cleveref_loaded_bool
                           {\cref@constructprefix{equation}{\cref@result}
                            \@ifundefined{cref@equation@alias}
                                  {\def\@tempa{equation}}
                                  {\def\@tempa{\csname cref@equation@alias\endcsname}}
                            \protected@edef\cref@currentlabel
                                           {[\@tempa][\arabic{equation}][\cref@result]
                                            \p@equation \g_tmpa_tl}}
                       \bool_if:NT \c__ww_typedref_loaded_bool
                          {\cs_set:Npn \sr@name {equation}}
                       \seq_map_function:NN \l__ww_labels_seq \__ww_old_label}
                 \bool_gset_eq:NN \g_tmpa_bool \l__ww_tag_star_bool
                 & \cs_set_eq:NN \theequation \g_tmpa_tl
                   \bool_if:NT \g_tmpa_bool {\cs_set:Npn \tagform@ {}}
                   \hbox_overlap_left:n
                     {\bool_if:NF \c__ww_leqno_bool
                        {\tikz [__ww_standard] \coordinate (\int_use:N\g__ww_line_int-v) ;}
                      \quad
                      \@eqnnum }
                   \bool_if:NT \c__ww_leqno_bool
                      {\tikz [__ww_standard] \coordinate (\int_use:N \g__ww_line_int-v) ;}
             }}
       \cr\noalign{\skip_vertical:n {#1 + \l__ww_interline_skip}
       \scan_stop:}}
\NewDocumentEnvironment {DispWithArrows} {O{}}
         {
          \bool_if:nT \c__ww_mathtools_loaded_bool
                 {\MH_if_boolean:nT {show_only_refs}
                    {\MT_showonlyrefs_false:
                      \MH_set_boolean_T:n {show_only_refs}
                      \bool_set_true:N \l__ww_notag_bool}}
           \bool_if:NT \c__ww_amsmath_loaded_bool \intertext@
           \if_mode_math:
               \__ww_msg_error:n {{DispWithArrows}~used~in~math~mode}
           \fi:
           \bool_set_false:N \l__ww_in_witharrows_bool
           \__ww_pre_environment:n {#1}
           \if_mode_vertical:
             \nointerlineskip
             \makebox[.6\linewidth]{}
           \fi:
           $$
           \vcenter \bgroup
           \spread@equation
           \bool_if:NTF \l__ww_fleqn_bool
                  {\tabskip = \c_zero_skip}
                  {\tabskip = 0 pt plus 1000 pt minus 1000 pt}
           \bool_if:NTF \c__ww_amsmath_loaded_bool
              {\cs_set_eq:NN \__ww_old_label \ltx@label}
              {\cs_set_eq:NN \__ww_old_label \label}
           \cs_set:Npn \notag {\msg_error:nnn {witharrows}
                                              {Command~not~allowed~in~{DispWithArrows}}
                                              {\notag}}
           \cs_set:Npn \nonumber {\msg_error:nnn {witharrows}
                                       {Command~not~allowed~in~{DispWithArrows}}
                                       {\nonumber}}
           \cs_set:Npn \tag ##1 {\msg_error:nnn {witharrows}
                                       {Command~not~allowed~in~{DispWithArrows}}
                                       {\tag}}
           \cs_set:Npn \label ##1 {\msg_error:nnn {witharrows}
                                       {Command~not~allowed~in~{DispWithArrows}}
                                       {\label}}
           \halign to \displaywidth \bgroup
             \int_gincr:N \g__ww_line_int
             \cs_set_eq:cN \l__ww_CommandName_tl \__ww_Arrow_first_column:
             \strut
             \bool_if:NT \l__ww_fleqn_bool
                   {\skip_horizontal:n \l__ww_mathindent_dim}
             \hfil
             $\bool_if:NT \l__ww_displaystyle_bool \displaystyle {##}$
             \tabskip = \c_zero_skip
            &
             \cs_set:Npn \notag {\bool_set_true:N \l__ww_notag_bool}
             \cs_set_eq:NN \nonumber \notag
             \cs_set_eq:NN \tag \__ww_tag
             \cs_set_eq:NN \label \__ww_label:n
             $\bool_if:NT \l__ww_displaystyle_bool \displaystyle {{}##}$
             \tabskip = 0 pt plus 1000 pt minus 1000 pt
             \int_gincr:N \g__ww_line_bis_int
             \tikz [remember~picture,overlay]
                  \node [__ww_node_style,
                         name = wa-\l__ww_prefix_str-\int_use:N\g__ww_line_int-l,
                         alias = {\tl_if_empty:NF \l__ww_name_tl
                                    {\l__ww_name_tl-\int_use:N\g__ww_line_int-l}} ] {} ;
             \hfil
             \tikz [remember~picture,overlay]
                   \node [__ww_node_style,
                          name = wa-\l__ww_prefix_str-\int_use:N\g__ww_line_int-r,
                          alias = {\tl_if_empty:NF \l__ww_name_tl
                                     {\l__ww_name_tl-\int_use:N\g__ww_line_int-r}} ] {} ;
             \bool_if:NT \l__ww_shownodenames_bool
                  {\hbox_overlap_right:n {\small wa-\l__ww_prefix_str
                                                   -\int_use:N\g__ww_line_int}}
            & ##
             \tabskip = \c_zero_skip
            && \__ww_msg_error:n {Third~column~in~an~environment~{DispWithArrows}}
               \iffalse ## \fi
             \cr}
          {\\
           \egroup
           \egroup
           \bool_if:NT \l__ww_wrap_lines_bool
             {\dim_gzero_new:N \g__ww_x_right_dim
              \dim_gset:Nn \g__ww_x_right_dim \c_max_dim
              \begin{tikzpicture} [__ww_standard]
              \int_step_variable:nnnNn 1 1 \g__ww_line_int \l_tmpa_int
                    {\tikz@parse@node\pgfutil@firstofone (\l_tmpa_int-v)
                     \dim_set:Nn \l_tmpa_dim \pgf@x
                     \dim_compare:nNnT \l_tmpa_dim < \g__ww_x_right_dim
                            {\dim_gset:Nn \g__ww_x_right_dim \l_tmpa_dim} }
              \end{tikzpicture}}
           {\begin{tikzpicture} [__ww_standard]
            \int_step_variable:nnnNn 1 1 \g__ww_line_int \l_tmpa_int
                {\tikz@parse@node\pgfutil@firstofone (\l_tmpa_int-v)
                     \dim_set:Nn \l_tmpa_dim \pgf@x
                 \tikz@parse@node\pgfutil@firstofone (\l_tmpa_int-l)
                     \dim_set:Nn \l_tmpb_dim \pgf@x
                 \dim_compare:nNnT \l_tmpb_dim > \l_tmpa_dim
                     {\__ww_msg_error:n {Collision}}}
             \end{tikzpicture}}
           \__ww_post_environment:
           \bool_if:nT \c__ww_mathtools_loaded_bool
                    {\MH_if_boolean:nT {show_only_refs}
                          \MT_showonlyrefs_true:}
           $$
           \bool_if:NT \g__ww_footnote_bool {\end{savenotes}}
           \ignorespacesafterend
           }
\NewDocumentCommand \__ww_tag {sm}
    {\tl_if_empty:NF \l__ww_tag_tl
          {\msg_error:nnn {witharrows} {Multiple~tags} {#2}}
     \bool_set_false:N \l__ww_notag_bool
     \bool_if:nT \c__ww_mathtools_loaded_bool
           {\MH_if_boolean:nT {show_only_refs}
                {\MH_if_boolean:nF {show_manual_tags}
                    {\bool_set_true:N \l__ww_notag_bool}}}
     \tl_set:Nn \l__ww_tag_tl {#2}
     \bool_set:Nn \l__ww_tag_star_bool {#1}
     \bool_if:nT {#1 && ! \bool_if_p:N \c__ww_amsmath_loaded_bool}
          { \__ww_msg_error:n {tag*~without~amsmath} }
    }
\NewDocumentEnvironment {DispWithArrows*} {}
     {\WithArrowsOptions{notag}
      \DispWithArrows}
     {\endDispWithArrows}
\cs_new_protected:Nn \__ww_draw_arrows:
  { \group_begin:
    \int_zero_new:N \l__ww_first_arrow_of_group_int
    \int_zero_new:N \l__ww_first_line_of_group_int
    \int_zero_new:N \l__ww_last_line_of_group_int
    \bool_set_true:N \l__ww_new_group_bool
    \int_set:Nn \l__ww_arrow_int 1
    \int_until_do:nNnn \l__ww_arrow_int > \g__ww_arrow_int
     {
       \prop_get:cnN {g__ww_arrow_\l__ww_prefix_str _\int_use:N\l__ww_arrow_int _prop}
                     {initial} \l_tmpa_tl
       \int_set:Nn \l__ww_initial_int {\l_tmpa_tl}
       \prop_get:cnN {g__ww_arrow_\l__ww_prefix_str _\int_use:N\l__ww_arrow_int _prop}
                     {final} \l_tmpa_tl
       \int_set:Nn \l__ww_final_int {\l_tmpa_tl}
       \bool_if:nT {     \int_compare_p:nNn \l__ww_pos_arrows_int = 7
                      && \int_compare_p:nNn \l__ww_arrow_int > 1
                      && \int_compare_p:nNn
                                 \l__ww_initial_int > \l__ww_last_line_of_group_int}
              {\__ww_draw_arrows:nn \l__ww_first_arrow_of_group_int {\l__ww_arrow_int - 1}
               \bool_set_true:N \l__ww_new_group_bool}
       \bool_if:nTF \l__ww_new_group_bool
              {\bool_set_false:N \l__ww_new_group_bool
               \int_set:Nn \l__ww_first_arrow_of_group_int \l__ww_arrow_int
               \int_set:Nn \l__ww_first_line_of_group_int \l__ww_initial_int
               \int_set:Nn \l__ww_last_line_of_group_int \l__ww_final_int
               \begin{tikzpicture} [__ww_standard]
               \tikz@parse@node\pgfutil@firstofone (\int_use:N\l__ww_initial_int-l)
               \dim_gset:Nn \g__ww_x_dim \pgf@x
               \end{tikzpicture}
               }
              {\int_set:Nn \l__ww_last_line_of_group_int
                     {\int_max:nn \l__ww_last_line_of_group_int \l__ww_final_int}}
       \__ww_update_x_value:nn \l__ww_initial_int \l__ww_final_int
       \int_incr:N \l__ww_arrow_int
     }
     \__ww_draw_arrows:nn \l__ww_first_arrow_of_group_int \g__ww_arrow_int
     \group_end:
  }
\cs_generate_variant:Nn \keys_set:nn {no}
\cs_new_protected:Nn \__ww_keys_set: {\keys_set:no {WithArrows/General}}
\cs_new_protected:Nn \__ww_draw_arrows:nn
  {\group_begin:
   \int_zero_new:N \l__ww_first_arrow_int
   \int_set:Nn \l__ww_first_arrow_int {#1}
   \int_zero_new:N \l__ww_last_arrow_int
   \int_set:Nn \l__ww_last_arrow_int {#2}
   \int_set:Nn \l__ww_arrow_int \l__ww_first_arrow_int
   \int_until_do:nNnn \l__ww_arrow_int > \l__ww_last_arrow_int
     {
      \prop_get:cnN {g__ww_arrow_\l__ww_prefix_str _\int_use:N\l__ww_arrow_int _prop}
                    {initial} \l_tmpa_tl
      \int_set:Nn \l__ww_initial_int {\l_tmpa_tl}
      \prop_get:cnN {g__ww_arrow_\l__ww_prefix_str _\int_use:N\l__ww_arrow_int _prop}
                    {final} \l_tmpa_tl
      \int_set:Nn \l__ww_final_int {\l_tmpa_tl}
      \int_compare:nNnTF \l__ww_final_int > \g__ww_line_int
         {\__ww_msg_error:n {Too~few~lines~for~an~arrow}}
         {\cs_if_free:cTF{pgf@sh@ns@wa-\l__ww_prefix_str-\int_use:N\l__ww_initial_int-l}
             { \__ww_msg_error:n {A~PGF~node~doesn't~exist} }
             {\cs_if_free:cTF{pgf@sh@ns@wa-\l__ww_prefix_str-\int_use:N\l__ww_final_int-l}
                 { \__ww_msg_error:n {A~PGF~node~doesn't~exist} }
                 {\__ww_draw_arrows_i:}}}
      \int_incr:N \l__ww_arrow_int
     }
   \group_end:
   }
\cs_new:Nn \__ww_draw_arrows_i:
     {\group_begin:
      \int_set:Nn \l__ww_previous_pos_arrows_int {-1}
      \int_set:Nn \l__ww_level_int 3
      \prop_get:cnN {g__ww_arrow_\l__ww_prefix_str
                        _\int_use:N\l__ww_arrow_int _prop} {options} \l_tmpa_tl
      \exp_args:NNo \exp_args:No
          \__ww_keys_set: {\l_tmpa_tl,tikz={xshift = \l__ww_xoffset_dim}}
      \bool_set_false:N \l__ww_initial_r_bool
      \bool_set_false:N \l__ww_final_r_bool
      \int_case:nn \l__ww_pos_arrows_int
             {0 {\bool_set_true:N \l__ww_initial_r_bool
                 \bool_set_true:N \l__ww_final_r_bool}
              2 {\bool_set_true:N \l__ww_initial_r_bool}
              3 {\bool_set_true:N \l__ww_final_r_bool}}
      \int_compare:nNnT \l__ww_pos_arrows_int = 5
             {
              \begin{tikzpicture} [__ww_standard]
              \tikz@parse@node\pgfutil@firstofone (\int_use:N\l__ww_initial_int-l)
              \dim_gset:Nn \g__ww_x_dim \pgf@x
              \end{tikzpicture}
              \__ww_update_x_value:nn \l__ww_initial_int \l__ww_final_int
             }
      \tl_set:Nx \l__ww_initial_tl
              {\int_use:N\l__ww_initial_int-\bool_if:NTF\l__ww_initial_r_bool rl .south}
      \tl_set:Nx \l__ww_final_tl
              {\int_use:N\l__ww_final_int-\bool_if:NTF\l__ww_final_r_bool rl .north}
      \prop_get:cnN {g__ww_arrow_\l__ww_prefix_str _\int_use:N\l__ww_arrow_int _prop}
                    {label}
                    \l_tmpa_tl
      \int_compare:nNnTF \l__ww_pos_arrows_int < 5
         {\begin{tikzpicture} [__ww_standard]
              \tikz@scan@one@point\pgfutil@firstofone(\l__ww_initial_tl)
              \tl_gset:Nx \g_tmpa_tl {\dim_use:N\pgf@x,\dim_use:N\pgf@y}
              \tikz@scan@one@point\pgfutil@firstofone(\l__ww_final_tl)
              \tl_gset:Nx \g_tmpb_tl {\dim_use:N\pgf@x,\dim_use:N\pgf@y}
          \end{tikzpicture}
}
         {\begin{tikzpicture} [__ww_standard]
              \tikz@scan@one@point\pgfutil@firstofone (\l__ww_initial_tl)
              \tl_gset:Nx \g_tmpa_tl {\dim_use:N \g__ww_x_dim , \dim_use:N \pgf@y}
              \tikz@scan@one@point\pgfutil@firstofone (\l__ww_final_tl)
              \tl_gset:Nx \g_tmpb_tl {\dim_use:N \g__ww_x_dim , \dim_use:N \pgf@y}
          \end{tikzpicture}}
      \__ww_draw_arrow:nno {\g_tmpa_tl} {\g_tmpb_tl} {\l_tmpa_tl}
      \group_end: }
\cs_new_protected:Nn \__ww_def_function_tmpa:n
    {\cs_set:Nn \__ww_tmpa:nnn
          {\begin{tikzpicture}[__ww_standard,every~path/.style = {WithArrows/arrow}]
              #1
           \end{tikzpicture}}}
\cs_new_protected:Nn \__ww_draw_arrow:nnn
           {
            \bool_if:nT {\l__ww_wrap_lines_bool && ! \l__ww_in_witharrows_bool}
               { \tl_set_eq:NN \l__ww_tikz_code_tl \c__ww_tikz_code_wrap_lines_tl }
            \exp_args:No \__ww_def_function_tmpa:n \l__ww_tikz_code_tl
            \__ww_tmpa:nnn {#1} {#2} {#3} }
\cs_generate_variant:Nn \__ww_draw_arrow:nnn {nno}
\tl_set:Nn \c__ww_tikz_code_wrap_lines_tl
                 {
                   \draw (#1) to node (__ww_label) {} (#2) ;
                   \tikz@parse@node \pgfutil@firstofone (__ww_label.west)
                   \dim_set:Nn \l_tmpa_dim {\g__ww_x_right_dim - \pgf@x - 0.3333 em}
                   \path \pgfextra {\tl_gset:Nx \g_tmpa_tl \tikz@text@width} ;
                   \tl_if_empty:NF \g_tmpa_tl
                      {\dim_set:Nn \l_tmpb_dim \g_tmpa_tl
                       \dim_compare:nNnT \l_tmpb_dim < \l_tmpa_dim
                           {\dim_set_eq:NN \l_tmpa_dim \l_tmpb_dim}}
                   \dim_compare:nNnT \l_tmpa_dim > \c_zero_dim
                      {\path (__ww_label.west)
                        node [anchor = west, text~width = \dim_use:N \l_tmpa_dim]
                        {#3} ; } }
\cs_new_protected:Nn \__ww_update_x_value:nn
    {\int_step_inline:nnnn {#1} 1 {#2}
       {\cs_if_exist:cT {pgf@sh@ns@wa-\l__ww_prefix_str-##1-l}
          {\begin{tikzpicture} [__ww_standard]
           \tikz@scan@one@point\pgfutil@firstofone (##1-l)
           \dim_gset:Nn \g__ww_x_dim {\dim_max:nn \g__ww_x_dim \pgf@x}
           \end{tikzpicture} } } }
\cs_new:Npn \WithArrowsLastEnv {\int_use:N \g__ww_last_env_int}
\keys_define:nn {WithArrows/CodeAfter}
     {tikz     .code:n            = \tikzset {WithArrows/arrow/.append~style = {#1}} ,
      tikz     .value_required:n  = true,
      rr       .value_forbidden:n = true,
      rr       .code:n            = \__ww_analyze_option_position:n 0 ,
      ll       .value_forbidden:n = true,
      ll       .code:n            = \__ww_analyze_option_position:n 1 ,
      rl       .value_forbidden:n = true,
      rl       .code:n            = \__ww_analyze_option_position:n 2 ,
      lr       .value_forbidden:n = true,
      lr       .code:n            = \__ww_analyze_option_position:n 3 ,
      v        .value_forbidden:n = true,
      v        .code:n            = \__ww_analyze_option_position:n 4 ,
      TikzCode .tl_set:N          = \l__ww_tikz_code_tl,
      TikzCode .value_required:n  = true,
      xoffset  .dim_set:N         = \l__ww_xoffset_dim,
      xoffset  .value_required:n  = true}
\NewDocumentCommand \__ww_Arrow_code_after {O{} mmm O{}}
     {\int_set:Nn \l__ww_pos_arrows_int 1
      \int_set:Nn \l__ww_previous_pos_arrows_int {-1}
      \group_begin:
           \int_set:Nn \l__ww_level_int 3
           \keys_set:nn {WithArrows/CodeAfter}
                        {#1,#5,tikz={xshift = \l__ww_xoffset_dim}}
           \bool_set_false:N \l__ww_initial_r_bool
           \bool_set_false:N \l__ww_final_r_bool
           \int_case:nn \l__ww_pos_arrows_int
                  {0 {\bool_set_true:N \l__ww_initial_r_bool
                      \bool_set_true:N \l__ww_final_r_bool}
                   2 {\bool_set_true:N \l__ww_initial_r_bool}
                   3 {\bool_set_true:N \l__ww_final_r_bool}}
           \cs_if_free:cTF {pgf@sh@ns@wa-\l__ww_prefix_str-#2-l}
             {\msg_error:nnx {witharrows} {Wrong~line~specification~in~Arrow} {#2}}
             {\cs_if_free:cTF {pgf@sh@ns@wa-\l__ww_prefix_str-#3-l}
                {\msg_error:nnx {witharrows} {Wrong~line~specification~in~Arrow} {#3}}
                {\int_compare:nNnTF \l__ww_pos_arrows_int = 4
                    {\begin{tikzpicture} [__ww_standard]
                        \tikz@scan@one@point\pgfutil@firstofone(#2-l.south)
                        \dim_set_eq:NN \l_tmpa_dim \pgf@x
                        \dim_set_eq:NN \l_tmpb_dim \pgf@y
                        \tikz@scan@one@point\pgfutil@firstofone(#3-l.north)
                        \dim_set:Nn \l_tmpa_dim {\dim_max:nn \l_tmpa_dim \pgf@x}
                        \tl_gset:Nx \g_tmpa_tl
                                    {\dim_use:N \l_tmpa_dim , \dim_use:N \l_tmpb_dim}
                        \tl_gset:Nx \g_tmpb_tl
                                    {\dim_use:N \l_tmpa_dim , \dim_use:N \pgf@y}
                     \end{tikzpicture} }
                    {\begin{tikzpicture} [__ww_standard]
                        \tikz@scan@one@point\pgfutil@firstofone
                                    (#2-\bool_if:NTF\l__ww_initial_r_bool rl .south)
                        \tl_gset:Nx \g_tmpa_tl {\dim_use:N \pgf@x , \dim_use:N \pgf@y}
                        \tikz@scan@one@point\pgfutil@firstofone
                                    (#3-\bool_if:NTF\l__ww_final_r_bool rl .north)
                        \tl_gset:Nx \g_tmpb_tl {\dim_use:N \pgf@x , \dim_use:N \pgf@y}
                     \end{tikzpicture}}
                 \__ww_draw_arrow:nnn {\g_tmpa_tl} {\g_tmpb_tl} {#4} }}
      \group_end:
      }
\cs_new_protected:Nn \__ww_MultiArrow:nn
    {
     \foreach \x in {#1} {\cs_if_free:cTF {pgf@sh@ns@wa-\l__ww_prefix_str-\x-l}
                            {\msg_error:nnx {witharrows}
                                            {Wrong~line~specification~in~MultiArrow}
                                            {\x}}
                            {\clist_gput_right:Nx \g_tmpa_clist {\x}}}
     \int_compare:nNnTF {\clist_count:N \g_tmpa_clist} < 2
       {\__ww_msg_error:n {Too~small~specification~for~MultiArrow}}
       {\clist_sort:Nn \g_tmpa_clist
                       {\int_compare:nNnTF {##1} > {##2}
                             {\sort_return_swapped:}
                             {\sort_return_same:}}
        \clist_pop:NN \g_tmpa_clist \l_tmpa_tl
        \clist_reverse:N \g_tmpa_clist
        \clist_pop:NN \g_tmpa_clist \l_tmpb_tl
        \exp_args:Nx \__ww_MultiArrow_i:n {\g_tmpa_clist}
        \begin{tikzpicture}[__ww_standard,every~path/.style={WithArrows/arrow}]
          \draw [<->] ([xshift = \l__ww_xoffset_dim]\l_tmpa_tl-r.south)
                       -- ++(5mm,0)
                       -- node (__ww_label) {}
                          ([xshift = \l__ww_xoffset_dim+5mm]\l_tmpb_tl-r.south)
                       -- ([xshift = \l__ww_xoffset_dim]\l_tmpb_tl-r.south)  ;
          \tikz@parse@node \pgfutil@firstofone (__ww_label.west)
          \dim_set:Nn \l_tmpa_dim {20 cm}
          \path \pgfextra {\tl_gset:Nx \g_tmpa_tl \tikz@text@width} ;
          \tl_if_empty:NF \g_tmpa_tl {\dim_set:Nn \l_tmpa_dim \g_tmpa_tl}
          \bool_if:nT {\l__ww_wrap_lines_bool && ! \l__ww_in_witharrows_bool}
                  {\dim_set:Nn \l_tmpb_dim {\g__ww_x_right_dim - \pgf@x - 0.3333 em}
                   \dim_compare:nNnT \l_tmpb_dim < \l_tmpa_dim
                           {\dim_set_eq:NN \l_tmpa_dim \l_tmpb_dim}}
          \path (__ww_label.west)
           node [anchor = west, text~width = \dim_use:N \l_tmpa_dim] {#2} ;
        \end{tikzpicture} } }

\cs_new_protected:Nn \__ww_MultiArrow_i:n
     {\begin{tikzpicture}[__ww_standard,every~path/.style={WithArrows/arrow}]
        \foreach \k in {#1}
           {\draw[<-] ([xshift = \l__ww_xoffset_dim]\k-r.south) -- ++(5mm,0) ;} ;
      \end{tikzpicture}}
\msg_new:nnn {witharrows}
             {Option~unknown}
             {The~option~"\tl_use:N\l_keys_key_tl"~is~unknown~or~
              meaningless~in~the~context.~If~you~go~on,~it~will~be~ignored.}
\msg_new:nnn {witharrows}
             {Collision}
             {You~have~a~collision~(or~almost~a~collision)~at~the~end~of~row~
              \int_use:N\g__ww_line_int.~
              You~can~go~on~but~maybe~you~will~have~overlapping~texts.}
\msg_new:nnn {witharrows}
             {Third~column~in~an~environment~{WithArrows}}
             {By~default,~an~environment~\{WithArrows\}~can~only~have~two~columns.~
              Maybe~you~have~forgotten~a~\str_use:N \c_backslash_str
              \str_use:N \c_backslash_str.~If~you~really~want~more~than~two~columns,~
              you~should~use~the~option~"MoreColumns"~at~a~global~level~or~for~
              an~environment.~However,~you~can~go~one~for~this~time.}
\msg_new:nnn {witharrows}
             {Third~column~in~an~environment~{DispWithArrows}}
             {An~environment~\{DispWithArrows\}~or~\{DispWithArrows*\}~can~only~
              have~two~columns.~If~you~go~on,~you~may~have~an~incorrect~output.}
\msg_new:nnn {witharrows}
             {The~option~"jump"~must~be~non~negative}
             {You~can't~use~a~strictly~negative~value~for~the~option~"jump"~of~command~
              \token_to_str:N\Arrow.~ You~can~create~an~arrow~going~backwards~with~
              the~option~"<-"~of~Tikz.}
\msg_new:nnn {witharrows}
             {Too~few~lines~for~an~arrow}
             {An~arrow~specified~in~line~\int_use:N \l__ww_initial_int\ can't~be~drawn~
              because~it~arrives~after~the~last~line~of~the~environment~(remind~that~
              the~command~\token_to_str:N\Arrow\ must~be~in~the~*start*~line~
              of~the~arrow).~If~you~go~on,~this~arrow~will~be~ignored.}
\msg_new:nnn {witharrows}
             {{WithArrows}~used~outside~math~mode}
             {The~environment~\{WithArrows\}~should~be~used~only~in~math~mode.~
              Nevertheless,~you~can~go~on.}
\msg_new:nnn {witharrows}
             {{DispWithArrows}~used~in~math~mode}
             {The~environment~\{DispWithArrows\}~should~be~used~only~outside~math~mode.~
              If~you~go~on,~you~will~have~other~errors.}
\msg_new:nnn {witharrows}
             {Two~options~are~incompatible}
             {You~try~to~use~the~option~"\tl_use:N\l_keys_key_tl"~but~
             this~option~is~incompatible~or~redundant~with~the~option~"
             \int_case:nn\l__ww_previous_pos_arrows_int
                 {0 {rr}
                  1 {ll}
                  2 {rl}
                  3 {lr}
                  4 {v}
                  5 {i}
                  6 {group}
                  7 {groups}}"~
             set~in~the~same~
             \int_case:nn\l__ww_level_int
                  {1 {command~\token_to_str:N\WithArrowsOptions}
                   2 {declaration~of~options~of~the~environment~
                      \{\@currenvir\}}
                   3 {command~\token_to_str:N\Arrow}}.~
             If~you~go~on,~I~will~use~the~option~"\tl_use:N\l_keys_key_tl".}
\msg_new:nnnn {witharrows}
              {All~lines~must~have~an~ampersand}
              {All~lines~of~an~environment~\{WithArrows\}~should~
               have~an~second~column~(because~the~nodes~are~created~
               in~the~second~column).~However,~you~can~go~on~but~you~will~
               have~an~error~if~one~of~your~arrows~needs~an~PGF~
               node~absent~by~lack~of~ampersand.~If~you~don't~want~to~
               see~this~message~again,~you~can~use~the~option~
               AllowLineWithoutAmpersand.}
              {Moreover, the~ampersand~can~be~implicit~
               (e.g.~if~you~use~\token_to_str:N\MoveEqLeft\ of~mathtools).}
\msg_new:nnn {witharrows}
             {Option~incompatible~with~"group(s)"}
             {You~try~to~use~the~option~"\tl_use:N\l_keys_key_tl"~while~
              you~are~using~the~option~"
              \int_compare:nNnTF \l__ww_pos_arrows_int = 5
                   {group}
                   {groups}".~
              It's~incompatible.~You~can~go~on~ignoring~this~option~
              "\tl_use:N\l_keys_key_tl"~but~you~should~correct~your~code.}
\msg_new:nnn {witharrows}
             {Option~will~be~ignored}
             {The~option~"\tl_use:N\l_keys_key_tl"~can't~be~used~here.~
              If~you~go~on,~it~will~be~ignored.}
\msg_new:nnn {witharrows}
             {Arrow~in~first~column}
             {You~should~not~use~the~command~\token_to_str:N\Arrow\
              \tl_if_eq:NNF \l__ww_CommandName_tl \l_tmpa_tl
                    {(renamed~in~\str_use:N \c_backslash_str
                     \tl_use:N \l__ww_CommandName_tl)~}
              ~in~the~first~column~but~only~in~the~second~column.\\
              However~you~can~go~on~for~this~time.}
\msg_new:nnn {witharrows}
             {Wrong~line~specification~in~Arrow}
             {The~specification~of~line~"#1"~you~use~in~\token_to_str:N\Arrow\
              ~doesn't~exist.\\
              If~you~go~on,~the~arrow~will~be~ignored.}
\msg_new:nnn {witharrows}
             {Wrong~line~specification~in~MultiArrow}
             {The~specification~of~line~"#1"~doesn't~exist.\\
              If~you~go~on,~it~will~be~ignored~for~\token_to_str:N \MultiArrow.}
\msg_new:nnn {witharrows}
             {Too~small~specification~for~MultiArrow}
             {The~specification~of~lines~you~gave~to~\token_to_str:N \MultiArrow\
              is~too~small:~we~need~at~least~two~lines.~If~you~go~on,~the~
              command~\token_to_str:N\MultiArrow\ ~will~be~ignored.}
\msg_new:nnn {witharrows}
             {A~PGF~node~doesn't~exist}
             {A~PGF~node~necessary~to~draw~an~arrow~doesn't~exist~
              because~you~didn't~put~an~ampersand~in~the~corresponding~line.~
              If~you~go~on,~the~arrow~will~be~ignored.}
\msg_new:nnn {witharrows}
             {tag*~without~amsmath}
             {We~can't~use~\token_to_str:N\tag*~because~you~haven't~load~amsmath~
              (or~mathtools).~If~you~go~on,~the~command~\token_to_str:N\tag\
              will~be~used~instead.}
\msg_new:nnn {witharrows}
             {Command~not~allowed~in~{DispWithArrows}}
             {The~command~\token_to_str:N #1
              is~not~allowed~in~the~first~column~of~\{DispWithArrows\}~but~
              only~in~the~second~column~(and,~of~course,~in~the~
              environments~of~amsmath).~If~you~go~on,~this~command~will~be~ignored.}
\msg_new:nnn {witharrows}
             {Command~not~allowed~in~{WithArrows}}
             {The~command~\token_to_str:N #1
              is~not~allowed~in~\{WithArrows\}~but~is~allowed~in~the~second~
              column~of~\{DispWithArrows\}~(and,~of~course,~in~the~
              environments~of~amsmath).~If~you~go~on,~this~command~will~be~ignored.}
\msg_new:nnn {witharrows}
             {Multiple~tags}
             {You~can't~use~twice~the~command~\token_to_str:N\tag\
              in~a~line~of~the~environment~\{\@currenvir\}.~If~you~go~on,~the~tag~
              '#1'~will~be~used.}
\msg_new:nnn {witharrows}
             {Multiple~labels}
             {Normaly,~we~can't~use~the~command~\token_to_str:N\label\
              twice~in~a~line~of~the~environment~\{\@currenvir\}.~
              However,~you~can~go~on.~
              If~you~don't~want~to~see~this~message~again,~you~can~use~the~option~
              "AllowMultipleLabels"~at~the~global~or~
              environment~level~(this~doesn't~work~if~you~use~cleveref).}
\coffin_new:N \l__ww_halign_coffin
\NewDocumentEnvironment {CasesWithArrows} {m O{}}
         {\hbox_set:Nn \l_tmpa_box {$\left\{\vcenter to 1cm {} \right.$}
          \dim_zero_new:N \l__ww_delim_wd_dim
          \dim_set:Nn \l__ww_delim_wd_dim {\box_wd:N \l_tmpa_box}
          \box_clear_new:N \l__ww_left_part_box
          \hbox_set:Nn \l__ww_left_part_box
                       {$\bool_if:NT \l__ww_displaystyle_bool \displaystyle #1 {}$}
          \bool_if:nT \c__ww_mathtools_loaded_bool
                 {\MH_if_boolean:nT {show_only_refs}
                    {\MT_showonlyrefs_false:
                      \MH_set_boolean_T:n {show_only_refs}
                      \bool_set_true:N \l__ww_notag_bool}}
           \bool_if:NT \c__ww_amsmath_loaded_bool \intertext@
           \if_mode_math:
               \__ww_msg_error:n {{DispWithArrows}~used~in~math~mode}
           \fi:
           \bool_set_false:N \l__ww_in_witharrows_bool
           %
           \__ww_pre_environment:n {#2}
           \nointerlineskip
           \hbox_to_wd:nn {0.6\linewidth} {}
           $$
           \spread@equation
           \vcoffin_set:Nnw \l__ww_halign_coffin \displaywidth
              \bool_if:NTF \l__ww_fleqn_bool
                     {\tabskip = \c_zero_skip}
                     {\tabskip = 0 pt plus 1000 pt minus 1000 pt}
              \bool_if:NTF \c__ww_amsmath_loaded_bool
                 {\cs_set_eq:NN \__ww_old_label \ltx@label}
                 {\cs_set_eq:NN \__ww_old_label \label}
              \cs_set:Npn \notag {\msg_error:nnn {witharrows}
                                      {Command~not~allowed~in~{DispWithArrows}}
                                      {\notag}}
              \cs_set:Npn \nonumber {\msg_error:nnn {witharrows}
                                      {Command~not~allowed~in~{DispWithArrows}}
                                      {\nonumber}}
              \cs_set:Npn \tag ##1 {\msg_error:nnn {witharrows}
                                      {Command~not~allowed~in~{DispWithArrows}}
                                      {\tag}}
              \cs_set:Npn \label ##1 {\msg_error:nnn {witharrows}
                                      {Command~not~allowed~in~{DispWithArrows}}
                                      {\label}}
              \halign to \displaywidth \bgroup
                \int_gincr:N \g__ww_line_int
                \cs_set_eq:cN \l__ww_CommandName_tl \__ww_Arrow_first_column:
                \strut
                \bool_if:NT \l__ww_fleqn_bool
                      {\skip_horizontal:n \l__ww_mathindent_dim}
                \hfil
                \skip_horizontal:n {\box_wd:N \l__ww_left_part_box + \l__ww_delim_wd_dim}
                $\bool_if:NT \l__ww_displaystyle_bool \displaystyle {##}$
                \tabskip = \c_zero_skip
               &
                \cs_set:Npn \notag {\bool_set_true:N \l__ww_notag_bool}
                \cs_set_eq:NN \nonumber \notag
                \cs_set_eq:NN \tag \__ww_tag
                \cs_set_eq:NN \label \__ww_label:n
                $\bool_if:NT \l__ww_displaystyle_bool \displaystyle {{}##}$
                \tabskip = 0 pt plus 1000 pt minus 1000 pt
                \int_gincr:N \g__ww_line_bis_int
                \tikz [remember~picture,overlay]
                     \node [__ww_node_style,
                            name = wa-\l__ww_prefix_str-\int_use:N\g__ww_line_int-l,
                            alias = {\tl_if_empty:NF \l__ww_name_tl
                                      {\l__ww_name_tl-\int_use:N\g__ww_line_int-l}} ] {} ;
                \hfil
                \tikz [remember~picture,overlay]
                     \node [__ww_node_style,
                            name = wa-\l__ww_prefix_str-\int_use:N\g__ww_line_int-r,
                            alias = {\tl_if_empty:NF \l__ww_name_tl
                                      {\l__ww_name_tl-\int_use:N\g__ww_line_int-r}} ] {} ;
                \bool_if:NT \l__ww_shownodenames_bool
                     {\hbox_overlap_right:n {\small wa-\l__ww_prefix_str
                                                      -\int_use:N\g__ww_line_int}}
               & ##
                \tabskip = \c_zero_skip
               && \__ww_msg_error:n {Third~column~in~an~environment~{DispWithArrows}}
                  \if_false: ## \fi:
                \cr}
          {   \\
              \egroup
              \unskip\unpenalty\unskip\unpenalty
              \box_set_to_last:N \l_tmpa_box
              \nointerlineskip
              \box_use:N \l_tmpa_box
              \dim_gzero_new:N \g__ww_alignment_dim
              \dim_gset:Nn \g__ww_alignment_dim {\box_wd:N \l_tmpa_box}
              \box_clear_new:N \l__ww_new_box
              \hbox_set:Nn \l__ww_new_box {\hbox_unpack_clear:N \l_tmpa_box}
              \dim_compare:nNnT {\box_wd:N \l__ww_new_box} < \g__ww_alignment_dim
                   {\dim_gset:Nn \g__ww_alignment_dim {\box_wd:N \l__ww_new_box}}
           \vcoffin_set_end:
           \hbox_to_wd:nn \displaywidth
             {
              \bool_if:NTF \l__ww_fleqn_bool
                    {\skip_horizontal:n \l__ww_mathindent_dim}
                    {\hfil}
              \hbox_to_wd:nn \g__ww_alignment_dim
                   { \box_use_drop:N \l__ww_left_part_box
                     \dim_set:Nn \l_tmpa_dim {   \box_ht:N \l__ww_halign_coffin
                                               + \box_dp:N \l__ww_halign_coffin}
                     $\left\{ \vcenter to \l_tmpa_dim {\vfil} \right.$}
              \hfil}
           \coffin_typeset:Nnnnn
                        \l__ww_halign_coffin {l} {vc} {-\displaywidth} \c_zero_dim
           $$
           \__ww_post_environment:
           \bool_if:nT \c__ww_mathtools_loaded_bool
                    {\MH_if_boolean:nT {show_only_refs}
                          \MT_showonlyrefs_true:}
           \ignorespacesafterend
           }
\endinput
%%
%% End of file `witharrows.sty'.
