witharrows (17aug17)

git-svn-id: svn://tug.org/texlive/trunk@45056 c570f23f-e606-0410-a88d-b1316a301751

1 files changed, 505 insertions, 0 deletions

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+% This work may be distributed and 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://mirrors.ctan.org/help/Catalogue/licenses.lppl.html
+% and version 1.3 or later is part of all distributions of LaTeX
+% version 2005/12/01 or later.
+
+
+% The author of this work is F. Pantigny (fpantigny at wanadoo point fr)
+
+\NeedsTeXFormat{LaTeX2e}[1994/06/01]
+
+
+\RequirePackage{l3keys2e}
+
+\ProvidesExplPackage
+  {WithArrows}
+  {2017/08/09}
+  {1.0}
+  {Draws arrows for explanations on the right side of a alignment.} 
+
+
+\RequirePackage{expl3}
+\RequirePackage{xparse}
+
+\RequirePackage{tikz}
+\usetikzlibrary{calc}
+\usetikzlibrary{arrows.meta}
+\usetikzlibrary{bending}
+
+
+
+\RequirePackage{footnote}
+
+
+
+% There is a style for the tips of arrow because someone will use this style
+% if he wants draw an arrow directly with a Tikz command in his document (probably using the Tikz nodes created by
+% {WithArrows} in the \halign.
+\tikzset{TipsOfWithArrows/.style= { > = {Straight~Barb[scale=1.2,bend]}} }
+
+
+% The following variables are for the options ; these options can be set at 3 levels : see the groups of keys defined in
+% the \keys_define:nn comand below.
+
+% if the beginning of the arrow use a "r" option (if not, it's a "l" option)
+\bool_new:N \l_wa_initial_r_bool
+\bool_set_true:N \l_wa_initial_r_bool
+
+% if the end of the arrow use a "r" option (if not, it's à "l" option)
+\bool_new:N \l_wa_final_r_bool
+\bool_set_true:N \l_wa_final_r_bool
+
+% if the arrow use a "i" option (in this case the options "l" and "r" for the ends are meaningless)
+\bool_new:N \l_wa_i_bool
+\bool_set_false:N \l_wa_i_bool
+
+% to translate the whole arrow to the right
+\dim_new:N \l_wa_xoffset_dim 
+\dim_set:Nn \l_wa_xoffset_dim {3mm}
+
+% to indicate if the nodes will be drawn (in red) ; useful only for debugging
+\bool_new:N \l_wa_shownodes_bool
+\bool_set_false:N \l_wa_shownodes_bool
+
+% to indiate if the elements of the \halign will be composed with \displaystyle
+\bool_new:N \l_wa_displaystyle_bool
+\bool_set_false:N \l_wa_displaystyle_bool
+
+% will contains the Tikz options used to draw the arrow
+\tl_clear_new:N \l_wa_options_tikz_tl
+% At each possible level for the options ("global", "env" or "local : see below), the new values will be appended
+% on the right of the token list \l_wa_options_tikz_tl
+
+% will be raised when a key controling position of the arrow has been set in the same list of key
+% useful in order to raise an error if 2 incompatibles keys are specified at the same level
+\bool_new:N \l_wa_position_key_already_set_bool
+\bool_set_false:N \l_wa_position_key_already_set_bool
+
+% This Tikz style is for the nodes created automatically in the \halign.
+\tikzstyle{wa_node_style}=[rectangle,
+                           inner~sep = 0 pt,
+                           minimum~height = 3 pt,
+                           minimum~width = 0pt,
+                           red,  % red... but will be drawn only if shownodes=true
+                           \bool_if:NT \l_wa_shownodes_bool {draw}]
+
+
+
+% There are 3 levels where keys can be set :
+% with \WithArrowsOptions{...} : this level will be called "global" level ;
+% with \begin{WithArrows}[...] : this level will be called "env" level ;
+% with \Arrow[...] : this level will be called "local" level.
+
+% That's why there is 3 groups of keys named "global", "env" and "local".
+
+% Before each \keys_set_groups:nnn, we execute a \keys_set_filter:nnn with group "secondary"
+% Thus, an unknown key will raise an error. Furthermore, the "primary" keys (those which are not in the 
+% group "secondary") will be set first : it's useful to raise an error if, for example, keys "i" and "group"
+% are set at the same level (which is incoherent).
+
+% There is also the group named "jump" (with only one key : "jump") for technical reasons.
+\keys_define:nn {WithArrows} 
+    { % the key named "jump" will be extracted in the \Arrow command 
+      jump     .groups:n          = {jump,secondary},
+      jump     .code:n            = {\int_set:Nn \l_jump_int {#1}
+                                     \int_compare:nNnF \l_jump_int > 0
+                                         {\msg_error:nn {WithArrows} {The~option~"jump"~must~be~non~negative}}},
+      jump     .value_required:n  = true,
+      %
+      % 0 = t = \vtop , 1 = c = \vcenter, 2 = b = \vbox
+      pos         .groups:n         = {global,env,secondary},
+      pos         .int_set:N        = \l_wa_pos_int,
+      pos         .initial:n        = 0,
+      pos         .value_required:n = true,
+      %
+      t           .groups:n         = {global,env,kown},
+      t           .meta:n           = {pos=0},
+      c           .groups:n         = {global,env,kown},
+      c           .meta:n           = {pos=1},
+      b           .groups:n         = {global,env,kown},
+      b           .meta:n           = {pos=2},
+      %
+      % if the user wants to give a new name to the \Arrow command (and the name \Arrow remains free)
+      CommandName .groups:n         = {global,env,secondary},
+      CommandName .tl_set:N         = \l_wa_CommandName_tl,
+      CommandName .initial:n        = {Arrow},
+      CommandName .value_required:n = true,
+      %
+      displaystyle .groups:n          = {global,env,secondary},
+      displaystyle .bool_set:N        = \l_wa_displaystyle_bool,
+      displaystyle .value_forbidden:n = true,
+      %
+      %
+      shownodes .groups:n          = {global,env,secondary},
+      shownodes .bool_set:N        = \l_wa_shownodes_bool,
+      shownodes .default:n         = true,
+      shownodes .value_forbidden:n = true, 
+      %
+      jot       .groups:n          = {env,secondary},  % don't put "global"
+      jot       .dim_set:N         = \jot, % \jot is a LaTeX parameter for the distance between 2 lines in displaymath
+      jot       .value_required:n  = true,
+      %
+      xoffset  .groups:n          = {global,env,local,secondary},
+      xoffset  .dim_set:N         = \l_wa_xoffset_dim,
+      xoffset  .value_required:n  = true,           
+      %
+      tikz     .groups:n          = {global,env,local,secondary},
+      tikz     .code:n            = {\tl_put_right:Nn \l_wa_options_tikz_tl {,#1}},
+      tikz     .value_required:n  = true,
+      %
+      ll       .groups:n          = {global,env,local,secondary},
+      ll       .value_forbidden:n = true, 
+      ll       .default:n         = true,
+      ll       .code:n            = {\bool_if:NT \l_wa_position_key_already_set_bool
+                                       {\msg_error:nn {WithArrows} {Two~options~are~incompatible}}
+                                     \bool_if:NT \l_wa_group_bool
+                                       {\msg_error:nn {WithArrows} {Option~incompatible~with~group}}
+                                     \bool_set_true:N \l_wa_position_key_already_set_bool
+                                     \bool_set_false:N \l_wa_initial_r_bool
+                                     \bool_set_false:N \l_wa_final_r_bool
+                                     \bool_set_false:N \l_wa_i_bool },
+      %
+      lr       .groups:n          = {global,env,local,secondary},
+      lr       .value_forbidden:n = true,
+      lr       .default:n         = true, 
+      lr       .code:n            = {\bool_if:NT \l_wa_position_key_already_set_bool
+                                       {\msg_error:nn {WithArrows} {Two~options~are~incompatible}}
+                                     \bool_if:NT \l_wa_group_bool
+                                       {\msg_error:nn {WithArrows} {Option~incompatible~with~group}}
+                                     \bool_set_true:N \l_wa_position_key_already_set_bool
+                                     \bool_set_false:N \l_wa_initial_r_bool
+                                     \bool_set_true:N  \l_wa_final_r_bool
+                                     \bool_set_false:N \l_wa_i_bool},
+      %
+      rl       .groups:n          = {global,env,local,secondary},
+      rl       .value_forbidden:n = true,
+      rl       .default:n         = true, 
+      rl       .code:n            = {\bool_if:NT \l_wa_position_key_already_set_bool
+                                       {\msg_error:nn {WithArrows} {Two~options~are~incompatible}}
+                                     \bool_if:NT \l_wa_group_bool
+                                       {\msg_error:nn {WithArrows} {Option~incompatible~with~group}}
+                                     \bool_set_true:N \l_wa_position_key_already_set_bool
+                                     \bool_set_true:N  \l_wa_initial_r_bool
+                                     \bool_set_false:N \l_wa_final_r_bool
+                                     \bool_set_false:N \l_wa_i_bool},
+      %
+      rr       .groups:n          = {global,env,local,secondary},
+      rr       .value_forbidden:n = true,
+      rr       .default:n         = true, 
+      rr       .code:n            = {\bool_if:NT \l_wa_position_key_already_set_bool
+                                       {\msg_error:nn {WithArrows} {Two~options~are~incompatible}}
+                                     \bool_if:NT \l_wa_group_bool
+                                       {\msg_error:nn {WithArrows} {Option~incompatible~with~group}}
+                                     \bool_set_true:N \l_wa_position_key_already_set_bool
+                                     \bool_set_true:N  \l_wa_initial_r_bool
+                                     \bool_set_true:N  \l_wa_final_r_bool
+                                     \bool_set_false:N  \l_wa_i_bool},
+      %
+      i        .groups:n          = {global,env,local,secondary},
+      i        .code:n            = {\bool_if:NT \l_wa_position_key_already_set_bool
+                                       {\msg_error:nn {WithArrows} {Two~options~are~incompatible}}
+                                     \bool_if:NT \l_wa_group_bool
+                                       {\msg_error:nn {WithArrows} {Option~incompatible~with~group}}
+                                     \bool_set_true:N \l_wa_position_key_already_set_bool
+                                     \bool_set_true:N \l_wa_i_bool},
+      i        .value_forbidden:n = true,
+      i        .default:n         = true,
+      %
+      % indicate if all the arrows of an environment are grouped
+      % volontary not in "secondary" group : thus, if will be set first during the \keys_set_filter:nnn
+      group        .groups:n          = {global,env},   
+      group        .bool_set:N        = \l_wa_group_bool,
+      group        .value_forbidden:n = true
+}
+
+
+
+
+
+\ProcessKeysOptions {WithArrows}
+
+
+% \WithArrowsOptions is the command of the WithArrows package to fix options at the document level
+\NewDocumentCommand \WithArrowsOptions {m}
+    {\bool_set_false:N \l_wa_position_key_already_set_bool
+     \keys_set_filter:nnn {WithArrows} {secondary} {#1}   % in order to raise an error if a key is unknown
+     \keys_set_groups:nnn {WithArrows} {global} {#1}}
+
+
+
+\NewDocumentEnvironment {WithArrows} {O{}}
+          {\reverse_if:N \if_mode_math:
+                             \msg_error:nn {WithArrows} {WithArrows~used~outside~math~mode}
+                         \fi
+           \savenotes % to extract the footnotes of the environment {WithArrows}
+           \m@th                
+           \def\\{\cr}
+           %
+           \int_gzero_new:N \g_wa_line_int  % to count the lines in the \halign 
+           %
+           % to count the arrows created in the environment
+           \int_gzero_new:N \g_wa_arrow_int 
+           %
+           % these 3 counters will be used later as variables
+           \int_zero_new:N \l_initial_int
+           \int_zero_new:N \l_final_int
+           \int_zero_new:N \l_arrow_int
+           % 
+           \bool_set_false:N \l_wa_position_key_already_set_bool
+           \keys_set_filter:nnn {WithArrows} {secondary} {#1} % in order to raise an error if a key is unknown
+           \keys_set_groups:nnn {WithArrows} {env} {#1}
+           %
+           \cs_set:cpn \l_wa_CommandName_tl {\wa_Arrow} % new name for \Arrow command in {WithArrows} environments
+           %
+           \int_case:nnF \l_wa_pos_int % is fixed via the options t, c or b
+                   {0 {\vtop}
+                    1 {\vcenter}
+                    2 {\vbox}}
+                   {\msg_error:nn {WithArrows} {Bad~value~for~option~pos}}
+           \bgroup
+           \openup\jot
+           \ialign\bgroup
+           \int_gincr:N \g_wa_line_int % will be used for the names of the 2 nodes of the line
+           \strut\hfil
+           $\bool_if:NT \l_wa_displaystyle_bool \displaystyle {##}$
+           & 
+           $\bool_if:NT \l_wa_displaystyle_bool \displaystyle {{}##}$
+           %
+           % we create a first node (the "left node" of the line)
+           \tikz[remember~picture] 
+                  \node [wa_node_style] (wa-\int_use:N\g_wa_line_int-l) {} ;
+           \hfil
+           % we create a second node (the "right node" of the line)
+           \tikz[remember~picture] 
+                  \node [wa_node_style] (wa-\int_use:N\g_wa_line_int-r) {} ;
+           \cr
+          }
+          {\crcr % 
+           \egroup% end of halign
+           \egroup% end of vtop (or \vcenter or \vbox)
+           %
+           \int_compare:nNnT \g_wa_arrow_int > 0   % If there is really arrows...
+                    \wa_draw_arrows:               % ...we draw these arrows.
+           \spewnotes
+           }
+
+
+
+% le following code is necessary because we whill have to expand un argument exactly 3 times
+\cs_generate_variant:Nn \keys_set_groups:nnn {nno}
+\cs_new:Nn \keys_set_groups_WithArrows_local: {\keys_set_groups:nno {WithArrows} {local}}
+
+\cs_generate_variant:Nn \keys_set_filter:nnn {nno}
+\cs_new:Nn \keys_set_filter_WithArrows_secondary: {\keys_set_filter:nno {WithArrows} {secondary}}
+
+\cs_new:Nn \wa_draw_arrows:
+  {%
+   % if the option "group" is used in the current environment
+   \bool_if:NT \l_wa_group_bool
+        \wa_x_computation_for_option_group:   % will compute \g_wa_x_dim which is the abscissa of all the arrows 
+   %
+   % loop over the arrows created in the environment : the arrows will be drawn
+   \int_set:Nn \l_arrow_int 1
+   \int_until_do:nNnn \l_arrow_int > \g_wa_arrow_int   % g_wa_arrow_int is the total number of arrows
+     {
+      % \l_initial_int is the line number from which the arrow starts
+      \int_set:Nn \l_initial_int {\int_use:c {wa_initial\int_use:N\l_arrow_int}}
+      %
+      % \l_final_int is the line number to which the arrow ends
+      \int_set:Nn \l_final_int {\int_use:c {wa_final\int_use:N\l_arrow_int}}
+      %
+      \int_compare:nNnT \l_final_int > \g_wa_line_int
+             {\msg_error:nn {WithArrows} {Too~few~lines~for~an~arrow}}
+      %
+      \group_begin: % for the options given in \Arrow[...] ("local level" of the options)
+           \keys_define:nn {WithArrows} {group .undefine:}
+           \bool_set_false:N \l_wa_position_key_already_set_bool
+           % the third argument de \keys_set_groups:nnn must be expanded exactly three times
+           % a x-expansion is not possible because there can be tokens like \bfseries in the option "font"
+           \exp_args:NNo \exp_args:No \keys_set_filter_WithArrows_secondary: {\use:c {wa_options\int_use:N\l_arrow_int}}
+           \exp_args:NNo \exp_args:No \keys_set_groups_WithArrows_local: {\use:c {wa_options\int_use:N\l_arrow_int}}
+           %
+           % In case of option "i", we have to compute the abscissa of the arrow (which is vertical).
+           \bool_if:NT \l_wa_i_bool
+               \wa_x_computation_for_option_i: % the abscissa is computed in \g_wa_x_dim
+           %
+           % \l_initial_tl contains the name of the Tikz node from which the arrow starts (in normal cases...
+           % because with option "group" or option "i", the point will perhaps have an other x-value --- but always the
+           % same y-value). 
+           \tl_set:Nx \l_initial_tl {wa-\int_use:N\l_initial_int-\bool_if:NTF\l_wa_initial_r_bool rl} 
+           %
+           % \l_final_tl contains the name of the Tikz node to which the arrow ends (in normal cases : with option
+           % "group" or option "i", the point will perhaps have an other x-value but always the same y-value)
+           \tl_set:Nx \l_final_tl {wa-\int_use:N\l_final_int-\bool_if:NTF\l_wa_final_r_bool rl . north}
+           % ". north" because we want a small gap between two consecutive arrows
+           % 
+           \begin{tikzpicture}[remember~picture,
+                               overlay,
+                               align=left,
+                               auto=left,
+                               font = {\small\itshape},
+                               TipsOfWithArrows,
+                               ->,
+                               looseness=1,
+                               bend~left=45]
+           \draw \exp_after:wN [\l_wa_options_tikz_tl]
+                 % \p1 and \p2 are the two ends of the arrow (in fact, not exactly in case of options "group" or "i")
+                 let \p1 = (\tl_use:N \l_initial_tl),
+                     \p2 = (\tl_use:N \l_final_tl) in 
+                   (\bool_if:nTF {\l_wa_group_bool || \l_wa_i_bool}
+                     {\dim_use:N \g_wa_x_dim + \dim_use:N \l_wa_xoffset_dim, \y1}
+                     {\x1 + \dim_use:N \l_wa_xoffset_dim, \y1} )
+                   to node (wa-a-\int_use:N\l_arrow_int) % in fact, this name will not be used by WithArrows
+                           {\tl_use:c {wa_label\int_use:N\l_arrow_int}}
+                   (\bool_if:nTF {\l_wa_group_bool || \l_wa_i_bool}
+                     {\dim_use:N \g_wa_x_dim + \dim_use:N \l_wa_xoffset_dim, \y2}
+                     {\x2 + \dim_use:N \l_wa_xoffset_dim, \y2} ) ; 
+           \end{tikzpicture}
+       \group_end: % for the options given to \Arrow[...] ("local level" of the options)
+       \int_incr:N \l_arrow_int
+      } % end of the loop over the arrows : all arrows are drawn
+     }
+
+
+% We want to compute the x-value for the current environment which has option "group" (and therefore all arrows are
+% vertical at the same abscissa). This value will be computed in \g_wa_x_dim (which is global for technical reasons :
+% we have to do assignments in a \tikz command).
+\cs_new:Nn \wa_x_computation_for_option_group:
+  {\dim_gzero_new:N \g_wa_x_dim
+   %
+   % first, we calculate the initial value for \g_wa_x_dim
+   % in this \tikz command, nothing is drawn : we only want to read the abscissa of a Tikz node
+   \tikz[remember~picture]
+      \path let \p1 = (wa-\int_use:c{wa_initial1}-l)      % "let" is given by the Tikz library "calc"
+            in \pgfextra {\dim_gset:Nn \g_wa_x_dim {\x1}} ;  % a global assignment is necessary because of \tikz
+   %
+   % Then, we loop to determine the maximal length of all the lines concerned by the arrows of the environment.
+   \int_set:Nn \l_arrow_int 1
+   \int_until_do:nNnn \l_arrow_int > \g_wa_arrow_int   % g_wa_arrow_int is the total number of arrows
+      { % \l_initial_int is the line number from which the arrow starts
+        \int_set:Nn \l_initial_int {\int_use:c {wa_initial\int_use:N\l_arrow_int}}
+        %
+        % \l_final_int is the line number to which the arrow ends
+        \int_set:Nn \l_final_int {\int_use:c {wa_final\int_use:N\l_arrow_int}}
+        %
+        \wa_x_computation_analyze_lines_between: %... between lines \l_initial_int and \l_final_int
+        %
+        \int_incr:N \l_arrow_int
+      } % end of the loop over the arrows of the environment
+   }   
+
+
+% We want to compute the x-value for the current arrow which has option "i" (and therefore is vertical).
+% This value will be computed in \g_wa_x_dim (which is global for technical reasons : we have to do assignments in
+% a \tikz command). 
+\cs_new:Nn \wa_x_computation_for_option_i:
+  {\dim_gzero_new:N \g_wa_x_dim
+   % First, we calculate the initial value for \g_wa_x_dim.
+   % In the next \tikz command, nothing is drawn : we only want to read a abscissa of a Tikz node.
+   \tikz[remember~picture]
+      \path let \p1 = (wa-\int_use:N\l_initial_int-l) % "let" is given by the Tikz library "calc"
+            in \pgfextra {\dim_gset:Nn \g_wa_x_dim {\x1}} ;  % a global assignment is necessary because of \tikz
+   %
+   \wa_x_computation_analyze_lines_between:  %... between lines \l_initial_int and \l_final_int
+   }
+
+
+
+        
+% We analyse lines between \l_initial_int and \l_final_int in order to modify \g_wa_x_dim in consequence.
+% More precisely, we will increase \g_wa_x_dim if we find a line longer than the current value of \g_wa_x_dim.
+\cs_new:Nn \wa_x_computation_analyze_lines_between:
+    {\int_compare:nNnT \l_final_int > \g_wa_line_int
+             {\msg_error:nn {WithArrows} {Too~few~lines~for~an~arrow}}
+     %
+     % \l_tmpa_int will be the index of the loop
+     \int_set:Nn \l_tmpa_int \l_initial_int
+     \int_until_do:nNnn \l_tmpa_int > \l_final_int
+         {% in the next \tikz command, nothing is drawn : we only want to read the abscissa of a Tikz node
+          \tikz[remember~picture]
+             \path let \p1 = (wa-\int_use:N\l_tmpa_int-l) 
+                   in \pgfextra {\dim_gset:Nn \g_wa_x_dim {\dim_max:nn \g_wa_x_dim {\x1}}} ; % \gset because of \tikz
+          \int_incr:N \l_tmpa_int
+         } % loop on the lines between \l_initial_int et \l_final_int
+    }   
+
+
+
+\cs_generate_variant:Nn \int_compare:nNnT {cNnT}
+
+\cs_generate_variant:Nn \tl_if_eq:nnF {onF}
+
+
+% The next command has a strange name, but, in fact, usually, we will have \let\Arrow\wa_Arrow ;
+% The user can use the CommandName option if he wants an other name for the command called \Arrow by default.
+% It's useful if the user already has a command named "\Arrow" he still wants to use.
+\NewDocumentCommand \wa_Arrow {O{} m O{}}
+         {\tl_if_eq:onF {\@currenvir} {WithArrows}
+                  {\msg_fatal:nn {WithArrows} {Arrow~used~outside~{WithArrows}~environment}}
+          %
+          % \g_wa_arrow_int counts the arrows in the environment
+          \int_gincr:N \g_wa_arrow_int
+          %
+          % we decide to extract immediatly the key "jump" in ordre to compute the end line ;
+          \int_zero_new:N \l_jump_int
+          \int_set:Nn \l_jump_int 1
+          \keys_set_groups:nnn {WithArrows} {jump} {#1,#3} % "jump" is the only key of the group "jump"
+          % 
+          % to stock the informations of the considered arrow (in four variables) ;
+          % these informations will be used when the arrow will be really drawn
+          \int_gzero_new:c {wa_initial\int_use:N\g_wa_arrow_int}
+          \int_gset_eq:cN  {wa_initial\int_use:N\g_wa_arrow_int} \g_wa_line_int
+          %
+          \int_gzero_new:c {wa_final\int_use:N\g_wa_arrow_int}
+          \int_gset:cn     {wa_final\int_use:N\g_wa_arrow_int} {\g_wa_line_int + \l_jump_int}
+          %
+          \tl_gclear_new:c {wa_options\int_use:N\g_wa_arrow_int}
+          \tl_gset:cn      {wa_options\int_use:N\g_wa_arrow_int} {#1,#3}
+          %
+          \tl_gclear_new:c {wa_label\int_use:N\g_wa_arrow_int}
+          \tl_gset:cn      {wa_label\int_use:N\g_wa_arrow_int} {#2}
+          %
+          }
+
+
+
+\msg_new:nnn {WithArrows}
+             {Arrow~used~outside~{WithArrows}~environment}
+             {Arrow~command~should~be~used~only~directly~in~\{WithArrows\}~environment\\
+              and~not~in~a~subenvironment.}
+
+\msg_new:nnn {WithArrows}
+             {The~option~"jump"~must~be~non~negative}
+             {You~can't~use~a~stricly~negative~value~for~the~option~"jump"~of~command~Arrow\\
+              You~can~create~an~arrow~going~backwards~with~the~option~"<-"~of~Tikz.}
+
+\msg_new:nnn {WithArrows}          
+             {Too~few~lines~for~an~arrow}
+             {There~is~at~least~an~arrow~that~can't~be~drawn~because~it~arrives~after~the\\
+              last~line~of~the~environment.}
+
+\msg_new:nnn {WithArrows}
+             {Bad~value~for~option~pos}
+             {The~option~"pos"~of~the~environment~\{WithArrows\}~must~be~equal~to\\        
+              0,~1,~or~2.}
+
+\msg_new:nnn {WithArrows}
+             {WithArrows~used~outside~math~mode}
+             {The~environment~WithArrows~must~be~used~only~in~math~mode.}
+
+\msg_new:nnn {WithArrows}
+             {Option~incompatible~with~group}
+             {You~try~to~use~the~option~"\tl_use:N\l_keys_key_tl"~while~you~are~using~the~option~"group".\\
+              It's~incompatible.~You~can~go~on~ignoring~this~option~"\tl_use:N\l_keys_key_tl"~and~"group"~will~be~used.}
+
+
+\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\\
+              with~an~option~previously~set.~If~you~go~on,~it~will~overwrite~the~previous~option.}
+
+
+\endinput
\ No newline at end of file