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%%
%% This is file `cascade.sty',
%% generated with the docstrip utility.
%%
%% The original source files were:
%%
%% cascade.dtx (with options: `package')
%%
%% Copyright (C) 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{1.01}
\def\myfiledate{2018/07/12}
\RequirePackage{l3keys2e}
\ProvidesExplPackage
{cascade}
{\myfiledate}
{\myfileversion}
{Easy presentation of demonstrations in cascades}
\RequirePackage{xparse}
%%
%% The following macro is the same as the macro of amsmath
\cs_if_free:NT \spread@equation
{\cs_set_protected:Npn \spread@equation
{\openup\jot
\cs_set_protected:Npn \spread@equation {}}}
%%
%% The following registers will be used for the options.
\dim_new:N \l__cascade_interline_dim
\dim_new:N \l__cascade_interline_all_dim
\dim_new:N \l__cascade_space_between_dim
\dim_set:Nn \l__cascade_space_between_dim {0.5 em}
%%
%% This set of options will be used by \Cascade and \ShortCascade
\keys_define:nn {cascade/command}
{
interline .dim_set:N = \l__cascade_interline_dim,
interline .value_required:n = true ,
interline-all .code:n = { \dim_set:Nn \l__cascade_interline_all_dim {#1}
\dim_set:Nn \l__cascade_interline_dim {#1} },
interline-all .value_required:n = true,
space-between .dim_set:N = \l__cascade_space_between_dim,
space-between .value_required:n = true}
%%
%% This set of options will be used by \CascadeOptions
\keys_define:nn {cascade/global}
{interline-all .dim_set:N = \l__cascade_interline_all_dim,
interline-all .value_required:n = true,
space-between .dim_set:N = \l__cascade_space_between_dim,
space-between .value_required:n = true}
\NewDocumentCommand \CascadeOptions {m}
{\keys_set:nn {cascade/global} {#1}}
%%
%% The command \Cascade is defined with \NewDocumentCommand of xparse
\NewDocumentCommand \Cascade {O{} mmmm}
{ \if_mode_math:
\msg_error:nn {cascade} {Cascade~in~math~mode}
\fi:
\mode_leave_vertical:
\group_begin:
\spread@equation
\dim_set_eq:NN \l__cascade_interline_dim \l__cascade_interline_all_dim
\keys_set:nn {cascade/command} {#1}
\box_clear_new:N \l__cascade_box_one
\box_clear_new:N \l__cascade_box_two
\box_clear_new:N \l__cascade_box_three
\box_clear_new:N \l__cascade_box_four
\hbox_set:Nn \l__cascade_box_one {#2}
\hbox_set:Nn \l__cascade_box_two {#3}
\hbox_set:Nn \l__cascade_box_three {#4}
\hbox_set:Nn \l__cascade_box_four {#5}
\dim_zero_new:N \l__cascade_top_dim
\dim_set:Nn \l__cascade_top_dim
{\dim_max:nn \c_zero_dim
{\box_ht:N \l__cascade_box_one - \box_ht:N \l__cascade_box_two}}
\dim_zero_new:N \l__cascade_bottom_dim
\dim_set:Nn \l__cascade_bottom_dim
{\dim_max:nn \c_zero_dim
{\box_dp:N \l__cascade_box_three - \box_dp:N \l__cascade_box_four}}
\box_set_ht:Nn \l__cascade_box_one \c_zero_dim
\box_set_dp:Nn \l__cascade_box_three \c_zero_dim
\vbox:n
{\skip_vertical:N \l__cascade_top_dim
\vbox_top:n
{\hbox:n
{$\left.
\vcenter {\halign{\hfil##\cr
\hbox:n{\tl_if_empty:nF {#2}
{\box_use_drop:N \l__cascade_box_one
\skip_horizontal:n \l__cascade_space_between_dim}
\box_use_drop:N \l__cascade_box_two \strut} \cr
\noalign{\skip_vertical:n \l__cascade_interline_dim}
\hbox:n{\tl_if_empty:nF {#4}
{\box_use_drop:N \l__cascade_box_three
\skip_horizontal:n \l__cascade_space_between_dim}
\box_use_drop:N \l__cascade_box_four \strut} \cr
}
}
\right\}$
}
\skip_vertical:N \l__cascade_bottom_dim
}
}
\group_end:
}
\msg_new:nnn {cascade}
{Cascade~in~math~mode}
{The~commands~\token_to_str:N \Cascade\
and~\token_to_str:N \ShortCascade\
should~be~used~in~text~mode~only.~However,~you~can~
go~on~for~this~time.}
\NewDocumentCommand \ShortCascade {O{}mm}
{\Cascade[#1]{}{#2}{}{#3}}
\endinput
%%
%% End of file `cascade.sty'.
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