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-% \iffalse
-%% File l3coffins.dtx (C) Copyright 2010 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 ``xcoffins 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.
-%%
-%% -----------------------------------------------------------------------
-%%
-%<*driver|package>
-\RequirePackage{expl3}
-\RequirePackage{graphicx,xcolor,trace}
-\GetIdInfo$Id: l3coffins.dtx 2209 2011-03-23 08:33:19Z joseph $
- {Coffins}
-%</driver|package>
-%<*driver>
-%\fi
-\ProvidesFile{\filename.\filenameext}
- [\filedate\space v\fileversion\space\filedescription]
-%\iffalse
-\documentclass{l3doc}
-\begin{document}
- \DocInput{\jobname.dtx}
-\end{document}
-%</driver>
-%\fi
-%
-%\title{^^A
-% The \LaTeX3 kernel: coffins\thanks{^^A
-% This file describes v\fileversion, last revised \filedate.^^A
-% }^^A
-%}
-%\author{\Team}^^A
-%
-%\date{Released \filedate}
-%
-%\maketitle
-%
-%\begin{abstract}
-% A \LaTeX3 `coffin' is a design-level method for typesetting
-% boxed material. The structure of coffins contains not only the
-% boxed material itself but also information about the size of the
-% box and potential alignment positions. This structure makes it is
-% possible to build complex layouts rapidly by assembling coffins.
-% The code here provides the low-level support system for coffins.
-%\end{abstract}
-%
-%\tableofcontents
-%
-%\begin{documentation}
-%
-%\section{Introduction}
-%
-% The material in this module provides the low-level support system
-% for coffins. For details about the design concept of a coffin, see
-% the \pkg{xcoffins} module.
-%
-%\section{Code-level functions}
-%
-%\begin{function}{
-% \coffin_new:N ,
-% \coffin_new:c ,
-%}
-% \begin{syntax}
-% \cs{coffin_new:N} \meta{coffin}
-% \end{syntax}
-% Creates a new \meta{coffin} or raises an error if the name is
-% already taken. The declaration is global. The \meta{coffin} will
-% initially be empty.
-%\end{function}
-%
-%\begin{function}{
-% \coffin_clear:N ,
-% \coffin_clear:c ,
-%}
-% \begin{syntax}
-% \cs{coffin_clear:N} \meta{coffin}
-% \end{syntax}
-% Clears the content of the \meta{coffin} within the current \TeX\
-% group level.
-%\end{function}
-%
-%\begin{function}{
-% \coffin_set_eq:NN ,
-% \coffin_set_eq:Nc ,
-% \coffin_set_eq:cN ,
-% \coffin_set_eq:cc ,
-%}
-% \begin{syntax}
-% \cs{coffin_set_eq:NN} \meta{coffin1} \meta{coffin2}
-% \end{syntax}
-% Sets both the content and poles of \meta{coffin1} equal to those
-% of \meta{coffin2} within the current \TeX\ group level.
-%\end{function}
-%
-%\begin{function}{
-% \hcoffin_set:Nn ,
-% \hcoffin_set:cn ,
-%}
-% \begin{syntax}
-% \cs{hcoffin_set:Nn} \meta{coffin} \Arg{material}
-% \end{syntax}
-% Typesets the \meta{material} in horizontal mode, storing the result
-% in the \meta{coffin}. The standard poles for the \meta{coffin} are
-% then set up based on the size of the typeset material.
-%\end{function}
-%
-%\begin{function}{
-% \vcoffin_set:Nnn ,
-% \vcoffin_set:cnn ,
-%}
-% \begin{syntax}
-% \cs{vcoffin_set:Nnn} \meta{coffin} \Arg{width} \Arg{material}
-% \end{syntax}
-% Typesets the \meta{material} in vertical mode constrained to the
-% given \meta{width} and stores the result in the \meta{coffin}. The
-% standard poles for the \meta{coffin} are then set up based on the
-% size of the typeset material.
-%\end{function}
-%
-%\begin{function}{
-% \coffin_set_horizontal_pole:Nnn ,
-% \coffin_set_horizontal_pole:cnn ,
-%}
-% \begin{syntax}
-% \cs{coffin_set_horizontal_pole:Nnn} \meta{coffin}
-% ~~\Arg{pole} \Arg{offset}
-% \end{syntax}
-% Sets the \meta{pole} to run horizontally through the \meta{coffin}.
-% The \meta{pole} will be located at the \meta{offset} from the
-% bottom edge of the bounding box of the \meta{coffin}. The
-% \meta{offset} should be given as a dimension expression; this may
-% include the terms cs{TotalHeight}, \cs{Height}, \cs{Depth} and
-% \cs{Width}, which will evaluate to the appropriate dimensions of
-% the \meta{coffin}.
-%\end{function}
-%
-%\begin{function}{
-% \coffin_set_vertical_pole:Nnn ,
-% \coffin_set_vertical_pole:cnn ,
-%}
-% \begin{syntax}
-% \cs{coffin_set_vertical_pole:Nnn} \meta{coffin}
-% ~~\Arg{pole} \Arg{offset}
-% \end{syntax}
-% Sets the \meta{pole} to run vertically through the \meta{coffin}.
-% The \meta{pole} will be located at the \meta{offset} from the
-% left-hand edge of the bounding box of the \meta{coffin}. The
-% \meta{offset} should be given as a dimension expression; this may
-% include the terms \cs{TotalHeight}, \cs{Height}, \cs{Depth} and
-% \cs{Width}, which will evaluate to the appropriate dimensions of
-% the \meta{coffin}.
-%\end{function}
-%
-%\begin{function}{
-% \coffin_rotate:Nn ,
-% \coffin_rotate:cn ,
-%}
-% \begin{syntax}
-% \cs{coffin_rotate:Nn} \meta{coffin} \Arg{angle}
-% \end{syntax}
-% Rotates the \meta{coffin} by the given \meta{angle} (given in
-% degrees counter-clockwise). This process will rotate both the
-% coffin content and poles. Multiple rotations will not result in
-% the bounding box of the coffin growing unnecessarily.
-%\end{function}
-%
-%\begin{function}{
-% \coffin_attach:NnnNnnnn ,
-% \coffin_attach:cnnNnnnn ,
-% \coffin_attach:Nnncnnnn ,
-% \coffin_attach:cnncnnnn ,
-%}
-% \begin{syntax}
-% \cs{coffin_attach:NnnNnnnn}
-% ~~\meta{coffin1} \Arg{coffin1-pole1} \Arg{coffin1-pole2}
-% ~~\meta{coffin2} \Arg{coffin2-pole1} \Arg{coffin2-pole2}
-% ~~\Arg{x-offset} \Arg{y-offset}
-% \end{syntax}
-% This function carries out alignment such that the bounding box
-% of \meta{coffin1} is not altered, \emph{i.e.}~\meta{coffin2} can
-% protrude outside of the bounding box of the coffin. The alignment
-% is carried out by first calculating \meta{handle1}, the
-% point of intersection of \meta{coffin1-pole1} and
-% \meta{coffin1-pole2}, and \meta{handle2}, the point of intersection
-% of \meta{coffin2-pole1} and \meta{coffin2-pole2}. \meta{coffin2} is
-% then attached to \meta{coffin1} such that the relationship between
-% \meta{handle1} and \meta{handle2} is described by the \meta{x-offset}
-% and \meta{y-offset}. The two offsets should be given as dimension
-% expressions.
-%\end{function}
-%
-%\begin{function}{
-% \coffin_join:NnnNnnnn ,
-% \coffin_join:cnnNnnnn ,
-% \coffin_join:Nnncnnnn ,
-% \coffin_join:cnncnnnn ,
-%}
-% \begin{syntax}
-% \cs{coffin_join:NnnNnnnn}
-% ~~\meta{coffin1} \Arg{coffin1-pole1} \Arg{coffin1-pole2}
-% ~~\meta{coffin2} \Arg{coffin2-pole1} \Arg{coffin2-pole2}
-% ~~\Arg{x-offset} \Arg{y-offset}
-% \end{syntax}
-% This function carries out alignment such that the bounding box
-% of \meta{coffin1} after the process will expand. The new bounding
-% box will cover the area contain the bounding boxes of the two
-% original coffins. The alignment is carried out by first calculating
-% \meta{handle1}, the point of intersection of \meta{coffin1-pole1} and
-% \meta{coffin1-pole2}, and \meta{handle2}, the point of intersection
-% of \meta{coffin2-pole1} and \meta{coffin2-pole2}. \meta{coffin2} is
-% then attached to \meta{coffin1} such that the relationship between
-% \meta{handle1} and \meta{handle2} is described by the \meta{x-offset}
-% and \meta{y-offset}. The two offsets should be given as dimension
-% expressions.
-%\end{function}
-%
-%\begin{function}{
-% \coffin_typeset:Nnnnn |
-% \coffin_typeset:cnnnn |
-%}
-% \begin{syntax}
-% \cs{coffin_typeset:Nnnnn} \meta{coffin} \Arg{pole1} \Arg{pole2}
-% ~~\Arg{x-offset} \Arg{y-offset}
-% \end{syntax}
-% Typesetting is carried out by first calculating \meta{handle}, the
-% point of intersection of \meta{pole1} and \meta{pole2}. The coffin
-% is then typeset such that the relationship between the current
-% reference point in the document and the \meta{handle} is described
-% by the \meta{x-offset} and \meta{y-offset}. The two offsets should
-% be given as dimension expressions. Typesetting a coffin is
-% therefore analogous to carrying out an alignment where the
-% `parent' coffin is the current insertion point.
-%\end{function}
-%
-%\begin{function}{
-% \coffin_display_handles:cn ,
-% \coffin_display_handles:cn ,
-%}
-% \begin{syntax}
-% \cs{coffin_display_handles:Nn} \meta{coffin} \Arg{colour}
-% \end{syntax}
-% This function first calculates the intersections between all of
-% the \meta{poles} of the \meta{coffin} to give a set of
-% \meta{handles}. It then prints the \meta{coffin} at the current
-% location in the source, with the position of the \meta{handles}
-% marked on the coffin. The \meta{handles} will be labelled as part
-% of this process: the locations of the \meta{handles} and the labels
-% are both printed in the \meta{colour} specified.
-%\end{function}
-%
-%\begin{function}{
-% \coffin_mark_handle:Nnnn ,
-% \coffin_mark_handle:cnnn ,
-%}
-% \begin{syntax}
-% \cs{coffin_mark_handle:Nnnn} \meta{coffin} \Arg{pole1} \Arg{pole2}
-% ~~\Arg{colour}
-% \end{syntax}
-% This function first calculates the \meta{handle} for the
-% \meta{coffin} as defined by the intersection of \meta{pole1} and
-% \meta{pole2}. It then marks the position of the \meta{handle}
-% on the \meta{coffin}. The \meta{handle} will be labelled as part of
-% this process: the location of the \meta{handle} and the label are
-% both printed in the \meta{colour} specified.
-%\end{function}
-%
-%\begin{function}{
-% \coffin_show_structure:N ,
-% \coffin_show_structure:c ,
-%}
-% \begin{syntax}
-% \cs{coffin_show_structure:N} \meta{coffin}
-% \end{syntax}
-% This function shows the structural information about the
-% \meta{coffin} in the terminal. The width, height and depth of the
-% typeset material are given, along with the location of all of the
-% poles of the coffin.
-%
-% Notice that the poles of a coffin are defined by four values:
-% the \( x \) and \( y \) co-ordinates of a point that the pole
-% passes through and the \( x \)- and \( y \)-components of a
-% vector denoting the direction of the pole. It is the ratio between
-% the later, rather than the absolute values, which determines the
-% direction of the pole.
-%\end{function}
-%
-%\end{documentation}
-%
-%\begin{implementation}
-%
-%\section{Implementation}
-%
-% \begin{macrocode}
-%<*package>
-% \end{macrocode}
-%
-% \begin{macrocode}
-\ProvidesExplPackage
- {\filename}{\filedate}{\fileversion}{\filedescription}
-% \end{macrocode}
-%
-%\subsection{Coffins: data structures and general variables}
-%
-%\begin{macro}{\l_coffin_tmp_box}
-%\begin{macro}{\l_coffin_tmp_dim}
-%\begin{macro}{\l_coffin_tmp_fp}
-%\begin{macro}{\l_coffin_tmp_tl}
-% Scratch variables.
-% \begin{macrocode}
-\box_new:N \l_coffin_tmp_box
-\dim_new:N \l_coffin_tmp_dim
-\fp_new:N \l_coffin_tmp_fp
-\tl_new:N \l_coffin_tmp_tl
-% \end{macrocode}
-%\end{macro}
-%\end{macro}
-%\end{macro}
-%\end{macro}
-%
-%\begin{macro}{\c_coffin_corners_prop}
-% The `corners;' of a coffin define the real content, as
-% opposed to the \TeX\ bounding box. They all start off in the same
-% place, of course.
-% \begin{macrocode}
-\prop_new:N \c_coffin_corners_prop
-\tl_set:Nn \l_coffin_tmp_tl { { 0 pt } { 0 pt } }
-\prop_put:Nno \c_coffin_corners_prop { tl } { \l_coffin_tmp_tl }
-\prop_put:Nno \c_coffin_corners_prop { tr } { \l_coffin_tmp_tl }
-\prop_put:Nno \c_coffin_corners_prop { bl } { \l_coffin_tmp_tl }
-\prop_put:Nno \c_coffin_corners_prop { br } { \l_coffin_tmp_tl }
-% \end{macrocode}
-%\end{macro}
-%
-%\begin{macro}{\c_coffin_poles_prop}
-% Pole positions are given for horizontal, vertical and reference-point
-% based values.
-% \begin{macrocode}
-\prop_new:N \c_coffin_poles_prop
-\tl_set:Nn \l_coffin_tmp_tl { { 0 pt } { 0 pt } { 0 pt } { 1000 pt } }
-\prop_put:Nno \c_coffin_poles_prop { l } { \l_coffin_tmp_tl }
-\prop_put:Nno \c_coffin_poles_prop { hc } { \l_coffin_tmp_tl }
-\prop_put:Nno \c_coffin_poles_prop { r } { \l_coffin_tmp_tl }
-\tl_set:Nn \l_coffin_tmp_tl { { 0 pt } { 0 pt } { 1000 pt } { 0 pt } }
-\prop_put:Nno \c_coffin_poles_prop { b } { \l_coffin_tmp_tl }
-\prop_put:Nno \c_coffin_poles_prop { vc } { \l_coffin_tmp_tl }
-\prop_put:Nno \c_coffin_poles_prop { t } { \l_coffin_tmp_tl }
-\prop_put:Nno \c_coffin_poles_prop { B } { \l_coffin_tmp_tl }
-\prop_put:Nno \c_coffin_poles_prop { H } { \l_coffin_tmp_tl }
-\prop_put:Nno \c_coffin_poles_prop { T } { \l_coffin_tmp_tl }
-% \end{macrocode}
-%\end{macro}
-%
-%\begin{macro}{\l_coffin_calc_a_fp}
-%\begin{macro}{\l_coffin_calc_b_fp}
-%\begin{macro}{\l_coffin_calc_c_fp}
-%\begin{macro}{\l_coffin_calc_d_fp}
-%\begin{macro}{\l_coffin_calc_result_fp}
-% Used for calculations of intersections and in other internal places.
-% \begin{macrocode}
-\fp_new:N \l_coffin_calc_a_fp
-\fp_new:N \l_coffin_calc_b_fp
-\fp_new:N \l_coffin_calc_c_fp
-\fp_new:N \l_coffin_calc_d_fp
-\fp_new:N \l_coffin_calc_result_fp
-% \end{macrocode}
-%\end{macro}
-%\end{macro}
-%\end{macro}
-%\end{macro}
-%\end{macro}
-%
-%\begin{macro}{\l_coffin_error_bool}
-% For propagating errors so that parts of the code can work around them.
-% \begin{macrocode}
-\bool_new:N \l_coffin_error_bool
-% \end{macrocode}
-%\end{macro}
-%
-%\begin{macro}{\l_coffin_offset_x_dim}
-%\begin{macro}{\l_coffin_offset_y_dim}
-% The offset between two sets of coffin handles when typesetting. These
-% values are corrected from those requested in an alignment for the
-% positions of the handles.
-% \begin{macrocode}
-\dim_new:N \l_coffin_offset_x_dim
-\dim_new:N \l_coffin_offset_y_dim
-% \end{macrocode}
-%\end{macro}
-%\end{macro}
-%
-%\begin{macro}{\l_coffin_pole_a_tl}
-%\begin{macro}{\l_coffin_pole_b_tl}
-% Needed for finding the intersection of two poles.
-% \begin{macrocode}
-\tl_new:N \l_coffin_pole_a_tl
-\tl_new:N \l_coffin_pole_b_tl
-% \end{macrocode}
-%\end{macro}
-%\end{macro}
-%
-%\begin{macro}{\l_coffin_sin_fp}
-%\begin{macro}{\l_coffin_cos_fp}
-% Used for rotations to get the sine and cosine values.
-% \begin{macrocode}
-\fp_new:N \l_coffin_sin_fp
-\fp_new:N \l_coffin_cos_fp
-% \end{macrocode}
-%\end{macro}
-%\end{macro}
-%
-%\begin{macro}{\l_coffin_x_dim}
-%\begin{macro}{\l_coffin_y_dim}
-%\begin{macro}{\l_coffin_x_prime_dim}
-%\begin{macro}{\l_coffin_y_prime_dim}
-% For calculating intersections and so forth.
-% \begin{macrocode}
-\dim_new:N \l_coffin_x_dim
-\dim_new:N \l_coffin_y_dim
-\dim_new:N \l_coffin_x_prime_dim
-\dim_new:N \l_coffin_y_prime_dim
-% \end{macrocode}
-%\end{macro}
-%\end{macro}
-%\end{macro}
-%\end{macro}
-%
-%\begin{macro}{\l_coffin_x_fp}
-%\begin{macro}{\l_coffin_y_fp}
-%\begin{macro}{\l_coffin_x_prime_fp}
-%\begin{macro}{\l_coffin_y_prime_fp}
-% Used for calculations where there are clear \( x \)- and
-% \( y \)-components, for example during vector rotation.
-% \begin{macrocode}
-\fp_new:N \l_coffin_x_fp
-\fp_new:N \l_coffin_y_fp
-\fp_new:N \l_coffin_x_prime_fp
-\fp_new:N \l_coffin_y_prime_fp
-% \end{macrocode}
-%\end{macro}
-%\end{macro}
-%\end{macro}
-%\end{macro}
-%
-%\begin{macro}{\l_coffin_Depth_dim}
-%\begin{macro}{\l_coffin_Height_dim}
-%\begin{macro}{\l_coffin_TotalHeight_dim}
-%\begin{macro}{\l_coffin_Width_dim}
-% Dimensions for the various parts of a coffin.
-% \begin{macrocode}
-\dim_new:N \l_coffin_Depth_dim
-\dim_new:N \l_coffin_Height_dim
-\dim_new:N \l_coffin_TotalHeight_dim
-\dim_new:N \l_coffin_Width_dim
-% \end{macrocode}
-%\end{macro}
-%\end{macro}
-%\end{macro}
-%\end{macro}
-%
-%\begin{macro}{\coffin_saved_Depth:}
-%\begin{macro}{\coffin_saved_Height:}
-%\begin{macro}{\coffin_saved_TotalHeight:}
-%\begin{macro}{\coffin_saved_Width:}
-% Used to save the meaning of \cs{Depth}, \cs{Height}, \cs{TotalHeight}
-% and \cs{Width}.
-% \begin{macrocode}
-\cs_new_nopar:Npn \coffin_saved_Depth: { }
-\cs_new_nopar:Npn \coffin_saved_Height: { }
-\cs_new_nopar:Npn \coffin_saved_TotalHeight: { }
-\cs_new_nopar:Npn \coffin_saved_Width: { }
-% \end{macrocode}
-%\end{macro}
-%\end{macro}
-%\end{macro}
-%\end{macro}
-%
-%\subsection{Basic coffin functions}
-%
-% There are a number of basic functions needed for creating coffins and
-% placing material in them. This all relies on the following data
-% structures.
-%
-%\begin{macro}{\coffin_if_exist_execute:Nn}
-% Several of the higher-level coffin functions will give multiple
-% errors if the coffin does not exist. A cleaner way to handle this
-% is provided here: both the box and the coffin structure are
-% checked.
-% \begin{macrocode}
-\cs_new_protected:Npn \coffin_if_exist_execute:Nn #1#2 {
- \cs_if_exist:NTF #1
- {
- \cs_if_exist:cTF { l_coffin_poles_ \tex_number:D #1 _prop }
- { #2 }
- {
- \msg_kernel_error:nnx { coffin } { unknown-coffin }
- { \token_to_str:N #1 }
- }
- }
- {
- \msg_kernel_error:nnx { coffin } { unknown-coffin }
- { \token_to_str:N #1 }
- }
-}
-% \end{macrocode}
-%\end{macro}
-%
-%\begin{macro}{
-% \coffin_clear:N ,
-% \coffin_clear:c ,
-%}
-% Clearing coffins means emptying the box and resetting all of the
-% structures.
-% \begin{macrocode}
-\cs_new_protected_nopar:Npn \coffin_clear:N #1 {
- \coffin_if_exist_execute:Nn #1
- {
- \box_clear:N #1
- \coffin_reset_structure:N #1
- }
-}
-\cs_generate_variant:Nn \coffin_clear:N { c }
-% \end{macrocode}
-%\end{macro}
-%
-%\begin{macro}{
-% \coffin_new:N ,
-% \coffin_new:c ,
-%}
-% Creating a new coffin means making the underlying box and adding the
-% data structures. These are created globally, as there is a need to
-% avoid any strange effects if the coffin is created inside a group.
-% This means that the usual rule about \cs{l_\ldots} variables has
-% to be broken.
-% \begin{macrocode}
-\cs_new_protected_nopar:Npn \coffin_new:N #1 {
- \box_new:N #1
- \cs_gundefine:c { l_coffin_corners_ \tex_number:D #1 _prop }
- \cs_gundefine:c { l_coffin_poles_ \tex_number:D #1 _prop }
- \prop_new:c { l_coffin_corners_ \tex_number:D #1 _prop }
- \prop_new:c { l_coffin_poles_ \tex_number:D #1 _prop }
- \prop_gset_eq:cN { l_coffin_corners_ \tex_number:D #1 _prop }
- \c_coffin_corners_prop
- \prop_gset_eq:cN { l_coffin_poles_ \tex_number:D #1 _prop }
- \c_coffin_poles_prop
-}
-\cs_generate_variant:Nn \coffin_new:N { c }
-% \end{macrocode}
-%\end{macro}
-%
-%\begin{macro}{
-% \hcoffin_set:Nn ,
-% \hcoffin_set:cn ,
-%}
-% Horizontal coffins are relatively easy: set the appropriate box,
-% reset the structures then update the handle positions.
-% \begin{macrocode}
-\cs_new_protected:Npn \hcoffin_set:Nn #1#2 {
- \coffin_if_exist_execute:Nn #1
- {
- \hbox_set:Nn #1
- {
- \group_begin:
- \set@color
- #2
- \group_end:
- }
- \coffin_reset_structure:N #1
- \coffin_update_poles:N #1
- \coffin_update_corners:N #1
- }
-}
-\cs_generate_variant:Nn \hcoffin_set:Nn { c }
-% \end{macrocode}
-%\end{macro}
-%
-%\begin{macro}{
-% \vcoffin_set:Nnn ,
-% \vcoffin_set:cnn ,
-%}
-% Setting vertical coffins is more complex. First, the material is
-% typeset with a given width. The default handles and poles are set as
-% for a horizontal coffin, before finding the top baseline using a
-% temporary box.
-% \begin{macrocode}
-\cs_new_protected:Npn \vcoffin_set:Nnn #1#2#3 {
- \coffin_if_exist_execute:Nn #1
- {
- \vbox_set:Nn #1
- {
- \dim_set:Nn \tex_hsize:D {#2}
- \group_begin:
- \set@color
- #3
- \group_end:
- }
- \coffin_reset_structure:N #1
- \coffin_update_poles:N #1
- \coffin_update_corners:N #1
- \vbox_set_top:Nn \l_coffin_tmp_box { \vbox_unpack:N #1 }
- \dim_set:Nn \l_coffin_tmp_dim
- { \box_ht:N #1 - \box_ht:N \l_coffin_tmp_box }
- \coffin_set_pole:Nnx #1 { T }
- {
- { 0 pt } { \dim_use:N \l_coffin_tmp_dim } { 1000 pt } { 0 pt }
- }
- }
-}
-\cs_generate_variant:Nn \vcoffin_set:Nnn { c }
-% \end{macrocode}
-%\end{macro}
-%
-%\begin{macro}{
-% \coffin_set_eq:NN ,
-% \coffin_set_eq:Nc ,
-% \coffin_set_eq:cN ,
-% \coffin_set_eq:cc ,
-%}
-% Setting two coffins equal is just a wrapper around other functions.
-% \begin{macrocode}
-\cs_new_protected_nopar:Npn \coffin_set_eq:NN #1#2 {
- \coffin_if_exist_execute:Nn #1
- {
- \box_set_eq:NN #1 #2
- \coffin_set_eq_structure:NN #1 #2
- }
-}
-\cs_generate_variant:Nn \coffin_set_eq:NN { c , Nc , cc }
-% \end{macrocode}
-%\end{macro}
-%
-%\begin{macro}{\c_empty_coffin}
-%\begin{macro}{\l_coffin_aligned_coffin}
-%\begin{macro}{\l_coffin_aligned_internal_coffin}
-% Special coffins: these cannot be set up earlier as they need
-% \cs{coffin_new:N}. The empty coffin is set as a box as the full
-% coffin-setting system needs some material which is not yet available.
-% \begin{macrocode}
-\coffin_new:N \c_empty_coffin
-\hbox_set:Nn \c_empty_coffin { }
-\coffin_new:N \l_coffin_aligned_coffin
-\coffin_new:N \l_coffin_aligned_internal_coffin
-% \end{macrocode}
-%\end{macro}
-%\end{macro}
-%\end{macro}
-%
-%\subsection{Coffins: handle and pole management}
-%
-%\begin{macro}{\coffin_get_pole:NnN}
-% A simple wrapper around the recovery of a coffin pole, with some
-% error checking and recovery built-in.
-% \begin{macrocode}
-\cs_set_protected_nopar:Npn \coffin_get_pole:NnN #1#2#3 {
- \prop_get:cnN { l_coffin_poles_ \tex_number:D #1 _prop } {#2} #3
- \quark_if_no_value:NT #3
- {
- \msg_kernel_error:nnxx { coffin } { unknown-coffin-pole }
- {#2} { \token_to_str:N #1 }
- \tl_set:Nn #3 { { 0 pt } { 0 pt } { 0 pt } { 0 pt } }
- }
-}
-% \end{macrocode}
-%\end{macro}
-%
-%\begin{macro}{\coffin_reset_structure:N}
-% Resetting the structure is a simple copy job.
-% \begin{macrocode}
-\cs_new_protected_nopar:Npn \coffin_reset_structure:N #1 {
- \prop_set_eq:cN { l_coffin_corners_ \tex_number:D #1 _prop }
- \c_coffin_corners_prop
- \prop_set_eq:cN { l_coffin_poles_ \tex_number:D #1 _prop }
- \c_coffin_poles_prop
-}
-% \end{macrocode}
-%\end{macro}
-%
-%\begin{macro}{\coffin_set_eq_structure:NN}
-% Setting coffin structures equal simply means copying the property
-% list.
-% \begin{macrocode}
-\cs_new_protected_nopar:Npn \coffin_set_eq_structure:NN #1#2 {
- \prop_set_eq:cc { l_coffin_corners_ \tex_number:D #1 _prop }
- { l_coffin_corners_ \tex_number:D #2 _prop }
- \prop_set_eq:cc { l_coffin_poles_ \tex_number:D #1 _prop }
- { l_coffin_poles_ \tex_number:D #2 _prop }
-}
-% \end{macrocode}
-%\end{macro}
-%
-%\begin{macro}{\coffin_set_user_dimensions:N}
-%\begin{macro}{\coffin_end_user_dimensions:}
-%\begin{macro}{\Depth}
-%\begin{macro}{\Height}
-%\begin{macro}{\TotalHeight}
-%\begin{macro}{\Width}
-% These make design-level names for the dimensions of a coffin easy to
-% get at.
-% \begin{macrocode}
-\cs_new_protected_nopar:Npn \coffin_set_user_dimensions:N #1 {
- \cs_set_eq:NN \coffin_saved_Height: \Height
- \cs_set_eq:NN \coffin_saved_Depth: \Depth
- \cs_set_eq:NN \coffin_saved_TotalHeight: \TotalHeight
- \cs_set_eq:NN \coffin_saved_Width: \Width
- \cs_set_eq:NN \Height \l_coffin_Height_dim
- \cs_set_eq:NN \Depth \l_coffin_Depth_dim
- \cs_set_eq:NN \TotalHeight \l_coffin_TotalHeight_dim
- \cs_set_eq:NN \Width \l_coffin_Width_dim
- \dim_set:Nn \Height { \box_ht:N #1 }
- \dim_set:Nn \Depth { \box_dp:N #1 }
- \dim_set:Nn \TotalHeight { \box_ht:N #1 - \box_dp:N #1 }
- \dim_set:Nn \Width { \box_wd:N #1 }
-}
-\cs_new_protected_nopar:Npn \coffin_end_user_dimensions: {
- \cs_set_eq:NN \Height \coffin_saved_Height:
- \cs_set_eq:NN \Depth \coffin_saved_Depth:
- \cs_set_eq:NN \TotalHeight \coffin_saved_TotalHeight:
- \cs_set_eq:NN \Width \coffin_saved_Width:
-}
-% \end{macrocode}
-%\end{macro}
-%\end{macro}
-%\end{macro}
-%\end{macro}
-%\end{macro}
-%\end{macro}
-%
-%\begin{macro}{
-% \coffin_set_horizontal_pole:Nnn ,
-% \coffin_set_horizontal_pole:cnn ,
-% \coffin_set_vertical_pole:Nnn ,
-% \coffin_set_vertical_pole:cnn ,
-% \coffin_set_pole:Nnn ,
-% \coffin_set_pole:Nnx ,
-%}
-% Setting the pole of a coffin at the user/designer level requires a
-% bit more care. The idea here is to provide a reasonable interface to
-% the system, then to do the setting with full expansion. The
-% three-argument version is used internally to do a direct setting.
-% \begin{macrocode}
-\cs_new_protected_nopar:Npn \coffin_set_horizontal_pole:Nnn #1#2#3 {
- \coffin_if_exist_execute:Nn #1
- {
- \coffin_set_user_dimensions:N #1
- \coffin_set_pole:Nnx #1 {#2}
- {
- { 0 pt } { \dim_eval:n {#3} }
- { 1000 pt } { 0 pt }
- }
- \coffin_end_user_dimensions:
- }
-}
-\cs_new_protected_nopar:Npn \coffin_set_vertical_pole:Nnn #1#2#3 {
- \coffin_if_exist_execute:Nn #1
- {
- \coffin_set_user_dimensions:N #1
- \coffin_set_pole:Nnx #1 {#2}
- {
- { \dim_eval:n {#3} } { 0 pt }
- { 0 pt } { 1000 pt }
- }
- \coffin_end_user_dimensions:
- }
-}
-\cs_new_protected_nopar:Npn \coffin_set_pole:Nnn #1#2#3 {
- \prop_put:cnn { l_coffin_poles_ \tex_number:D #1 _prop } {#2} {#3}
-}
-\cs_generate_variant:Nn \coffin_set_horizontal_pole:Nnn { c }
-\cs_generate_variant:Nn \coffin_set_vertical_pole:Nnn { c }
-\cs_generate_variant:Nn \coffin_set_pole:Nnn { Nnx }
-% \end{macrocode}
-%\end{macro}
-%
-%\begin{macro}{\coffin_update_corners:N}
-% Updating the corners of a coffin is straight-forward as at this stage
-% there can be no rotation. So the corners of the content are just those
-% of the underlying \TeX\ box.
-% \begin{macrocode}
-\cs_new_protected_nopar:Npn \coffin_update_corners:N #1 {
- \prop_put:cnx { l_coffin_corners_ \tex_number:D #1 _prop } { tl }
- { { 0 pt } { \dim_use:N \box_ht:N #1 } }
- \prop_put:cnx { l_coffin_corners_ \tex_number:D #1 _prop } { tr }
- { { \dim_use:N \box_wd:N #1 } { \dim_use:N \box_ht:N #1 } }
- \dim_set:Nn \l_coffin_tmp_dim { - \dim_use:N \box_dp:N #1 }
- \prop_put:cnx { l_coffin_corners_ \tex_number:D #1 _prop } { bl }
- { { 0 pt } { \dim_use:N \l_coffin_tmp_dim } }
- \prop_put:cnx { l_coffin_corners_ \tex_number:D #1 _prop } { br }
- { { \dim_use:N \box_wd:N #1 } { \dim_use:N \l_coffin_tmp_dim } }
-}
-% \end{macrocode}
-%\end{macro}
-%
-%\begin{macro}{\coffin_update_poles:N}
-% This function is called when a coffin is set, and updates the poles to
-% reflect the nature of size of the box. Thus this function only alters
-% poles where the default position is dependent on the size of the box.
-% It also does not set poles which are relevant only to vertical
-% coffins.
-% \begin{macrocode}
-\cs_new_protected_nopar:Npn \coffin_update_poles:N #1 {
- \dim_set:Nn \l_coffin_tmp_dim { 0.5 \box_wd:N #1 }
- \prop_put:cnx { l_coffin_poles_ \tex_number:D #1 _prop } { hc }
- { { \dim_use:N \l_coffin_tmp_dim } { 0 pt } { 0 pt } { 1000 pt } }
- \prop_put:cnx { l_coffin_poles_ \tex_number:D #1 _prop } { r }
- { { \dim_use:N \box_wd:N #1 } { 0 pt } { 0 pt } { 1000 pt } }
- \dim_set:Nn \l_coffin_tmp_dim { ( \box_ht:N #1 - \box_dp:N #1 ) / 2 }
- \prop_put:cnx { l_coffin_poles_ \tex_number:D #1 _prop } { vc }
- { { 0 pt } { \dim_use:N \l_coffin_tmp_dim } { 1000 pt } { 0 pt } }
- \prop_put:cnx { l_coffin_poles_ \tex_number:D #1 _prop } { t }
- { { 0 pt } { \dim_use:N \box_ht:N #1 } { 1000 pt } { 0 pt } }
- \dim_set:Nn \l_coffin_tmp_dim { \box_dp:N #1 }
- \dim_compare:nNnF { \l_coffin_tmp_dim } = { \c_zero_dim }
- { \dim_set:Nn \l_coffin_tmp_dim { -\l_coffin_tmp_dim } }
- \prop_put:cnx { l_coffin_poles_ \tex_number:D #1 _prop } { b }
- { { 0 pt } { \dim_use:N \l_coffin_tmp_dim } { 1000 pt } { 0 pt } }
-}
-% \end{macrocode}
-%\end{macro}
-%
-%\subsection{Coffins: calculation of pole intersections}
-%
-%\begin{macro}{\coffin_calculate_intersection:Nnn}
-%\begin{macro}[aux]{\coffin_calculate_intersection:nnnnnnnn}
-%\begin{macro}[aux]{\coffin_calculate_intersection_aux:nnnnnN}
-% The lead off in finding intersections is to recover the two poles
-% and then hand off to the auxiliary for the actual calculation. There
-% may of course not be an intersection, for which an error trap is
-% needed.
-% \begin{macrocode}
-\cs_new_protected_nopar:Npn \coffin_calculate_intersection:Nnn #1#2#3 {
- \coffin_get_pole:NnN #1 {#2} \l_coffin_pole_a_tl
- \coffin_get_pole:NnN #1 {#3} \l_coffin_pole_b_tl
- \bool_set_false:N \l_coffin_error_bool
- \exp_last_two_unbraced:Noo
- \coffin_calculate_intersection:nnnnnnnn
- \l_coffin_pole_a_tl \l_coffin_pole_b_tl
- \bool_if:NT \l_coffin_error_bool
- {
- \msg_kernel_error:nn { coffin } { no-pole-intersection }
- \dim_zero:N \l_coffin_x_dim
- \dim_zero:N \l_coffin_y_dim
- }
-}
-% \end{macrocode}
-% The two poles passed here each have four values (as dimensions),
-% (\( a \), \( b \), \( c \), \( d \)) and
-% (\( a' \), \( b' \), \( c' \), \( d' \)). These are arguments
-% \( 1 \)--\( 4 \) and \( 5 \)--\( 8 \), respectively. In both
-% cases \( a \) and \( b \) are the co-ordinates of a point on the
-% pole and \( c \) and \( d \) define the direction of the pole. Finding
-% the intersection depends on the directions of the poles, which are
-% given by \( d / c \) and \( d' / c' \). However, if one of the poles
-% is either horizontal or vertical then one or more of \( c \), \( d \),
-% \( c' \) and \( d' \) will be zero and a special case is needed.
-% \begin{macrocode}
-\cs_new_protected_nopar:Npn
- \coffin_calculate_intersection:nnnnnnnn #1#2#3#4#5#6#7#8 {
- \dim_compare:nNnTF {#3} = { \c_zero_dim }
-% \end{macrocode}
-% The case where the first pole is vertical. So the \( x \)-component
-% of the interaction will be at \( a \). There is then a test on the
-% second pole: if it is also vertical then there is an error.
-% \begin{macrocode}
- {
- \dim_set:Nn \l_coffin_x_dim {#1}
- \dim_compare:nNnTF {#7} = { \c_zero_dim }
- { \bool_set_true:N \l_coffin_error_bool }
-% \end{macrocode}
-% The second pole may still be horizontal, in which case the
-% \( y \)-component of the intersection will be \( b' \). If not,
-% \[
-% y = \frac{d'}{c'} \left ( x - a' \right ) + b'
-% \]
-% with the \( x \)-component already known to be "#1". This calculation
-% is done as a generalised auxiliary.
-% \begin{macrocode}
- {
- \dim_compare:nNnTF {#8} = { \c_zero_dim }
- { \dim_set:Nn \l_coffin_y_dim {#6} }
- {
- \coffin_calculate_intersection_aux:nnnnnN
- {#1} {#5} {#6} {#7} {#8} \l_coffin_y_dim
- }
- }
- }
-% \end{macrocode}
-% If the first pole is not vertical then it may be horizontal. If so,
-% then the procedure is essentially the same as that already done but
-% with the \( x \)- and \( y \)-components interchanged.
-% \begin{macrocode}
- {
- \dim_compare:nNnTF {#4} = { \c_zero_dim }
- {
- \dim_set:Nn \l_coffin_y_dim {#2}
- \dim_compare:nNnTF {#8} = { \c_zero_dim }
- { \bool_set_true:N \l_coffin_error_bool }
- {
- \dim_compare:nNnTF {#7} = { \c_zero_dim }
- { \dim_set:Nn \l_coffin_x_dim {#5} }
-% \end{macrocode}
-% The formula for the case where the second pole is neither horizontal
-% nor vertical is
-% \[
-% x = \frac{c'}{d'} \left ( y - b' \right ) + a'
-% \]
-% which is again handled by the same auxiliary.
-% \begin{macrocode}
- {
- \coffin_calculate_intersection_aux:nnnnnN
- {#2} {#6} {#5} {#8} {#7} \l_coffin_x_dim
- }
- }
- }
-% \end{macrocode}
-% The first pole is neither horizontal nor vertical. This still leaves
-% the second pole, which may be a special case. For those possibilities,
-% the calculations are the same as above with the first and second poles
-% interchanged.
-% \begin{macrocode}
- {
- \dim_compare:nNnTF {#7} = { \c_zero_dim }
- {
- \dim_set:Nn \l_coffin_x_dim {#5}
- \coffin_calculate_intersection_aux:nnnnnN
- {#5} {#1} {#2} {#3} {#4} \l_coffin_y_dim
- }
- {
- \dim_compare:nNnTF {#8} = { \c_zero_dim }
- {
- \dim_set:Nn \l_coffin_x_dim {#6}
- \coffin_calculate_intersection_aux:nnnnnN
- {#6} {#2} {#1} {#4} {#3} \l_coffin_x_dim
- }
-% \end{macrocode}
-% If none of the special cases apply then there is still a need to
-% check that there is a unique intersection between the two pole. This
-% is the case if they have different slopes.
-% \begin{macrocode}
- {
- \fp_set_from_dim:Nn \l_coffin_calc_a_fp {#3}
- \fp_set_from_dim:Nn \l_coffin_calc_b_fp {#4}
- \fp_set_from_dim:Nn \l_coffin_calc_c_fp {#7}
- \fp_set_from_dim:Nn \l_coffin_calc_d_fp {#8}
- \fp_div:Nn \l_coffin_calc_b_fp \l_coffin_calc_a_fp
- \fp_div:Nn \l_coffin_calc_d_fp \l_coffin_calc_c_fp
- \fp_compare:nNnTF
- { \l_coffin_calc_b_fp } = { \l_coffin_calc_d_fp }
- { \bool_set_true:N \l_coffin_error_bool }
-% \end{macrocode}
-% All of the tests pass, so there is the full complexity of the
-% calculation:
-% \[
-% x = \frac { a ( d / c ) - a' ( d' / c' ) - b + b' }
-% { ( d / c ) - ( d' / c' ) }
-% \]
-% and noting that the two ratios are already worked out from the test
-% just performed. There is quite a bit of shuffling from dimensions to
-% floating points in order to do the work. The \( y \)-values is then
-% worked out using the standard auxiliary starting from the
-% \( x \)-position.
-% \begin{macrocode}
- {
- \fp_set_from_dim:Nn \l_coffin_calc_result_fp {#6}
- \fp_set_from_dim:Nn \l_coffin_calc_a_fp {#2}
- \fp_sub:Nn \l_coffin_calc_result_fp
- { \l_coffin_calc_a_fp }
- \fp_set_from_dim:Nn \l_coffin_calc_a_fp {#1}
- \fp_mul:Nn \l_coffin_calc_a_fp
- { \l_coffin_calc_b_fp }
- \fp_add:Nn \l_coffin_calc_result_fp
- { \l_coffin_calc_a_fp }
- \fp_set_from_dim:Nn \l_coffin_calc_a_fp {#5}
- \fp_mul:Nn \l_coffin_calc_a_fp
- { \l_coffin_calc_d_fp }
- \fp_sub:Nn \l_coffin_calc_result_fp
- { \l_coffin_calc_a_fp }
- \fp_sub:Nn \l_coffin_calc_b_fp
- { \l_coffin_calc_d_fp }
- \fp_div:Nn \l_coffin_calc_result_fp
- { \l_coffin_calc_b_fp }
- \dim_set:Nn \l_coffin_x_dim
- { \fp_to_dim:N \l_coffin_calc_result_fp }
- \coffin_calculate_intersection_aux:nnnnnN
- { \l_coffin_x_dim }
- {#5} {#6} {#8} {#7} \l_coffin_y_dim
- }
- }
- }
- }
- }
-}
-% \end{macrocode}
-% The formula for finding the intersection point is in most cases the
-% same. The formula here is
-% \[
-% \#6 = \frac{\#5}{\#4} \left ( \#1 - \#2 \right ) + \#3
-% \]
-% Thus "#4" and "#5" should be the directions of the pole while
-% "#2" and "#3" are co-ordinates.
-% \begin{macrocode}
-\cs_new_protected_nopar:Npn
- \coffin_calculate_intersection_aux:nnnnnN #1#2#3#4#5#6 {
- \fp_set_from_dim:Nn \l_coffin_calc_result_fp {#1}
- \fp_set_from_dim:Nn \l_coffin_calc_a_fp {#2}
- \fp_set_from_dim:Nn \l_coffin_calc_b_fp {#3}
- \fp_set_from_dim:Nn \l_coffin_calc_c_fp {#4}
- \fp_set_from_dim:Nn \l_coffin_calc_d_fp {#5}
- \fp_sub:Nn \l_coffin_calc_result_fp { \l_coffin_calc_a_fp }
- \fp_div:Nn \l_coffin_calc_result_fp { \l_coffin_calc_d_fp }
- \fp_mul:Nn \l_coffin_calc_result_fp { \l_coffin_calc_c_fp }
- \fp_add:Nn \l_coffin_calc_result_fp { \l_coffin_calc_b_fp }
- \dim_set:Nn #6 { \fp_to_dim:N \l_coffin_calc_result_fp }
-}
-% \end{macrocode}
-%\end{macro}
-%\end{macro}
-%\end{macro}
-%
-%\subsection{Aligning and typesetting of coffins}
-%
-%\begin{macro}{
-% \coffin_join:NnnNnnnn ,
-% \coffin_join:cnnNnnnn ,
-% \coffin_join:Nnncnnnn ,
-% \coffin_join:cnncnnnn ,
-%}
-% This command joins two coffins, using a horizontal and vertical pole
-% from each coffin and making an offset between the two. The result
-% is stored as the as a third coffin, which will have all of its handles
-% reset to standard values. First, the more basic alignment function is
-% used to get things started.
-% \begin{macrocode}
-\cs_new_protected_nopar:Npn \coffin_join:NnnNnnnn #1#2#3#4#5#6#7#8 {
- \coffin_align:NnnNnnnnN
- #1 {#2} {#3} #4 {#5} {#6} {#7} {#8} \l_coffin_aligned_coffin
-% \end{macrocode}
-% Correct the placement of the reference point. If the \( x \)-offset
-% is negative then the reference point of the second box is to the left
-% of that of the first, which is corrected using a kern. On the right
-% side the first box might stick out, which will show up if it is wider
-% than the sum of the \( x \)-offset and the width of the second box.
-% So a second kern may be needed.
-% \begin{macrocode}
- \hbox_set:Nn \l_coffin_aligned_coffin
- {
- \dim_compare:nNnT { \l_coffin_offset_x_dim } < { \c_zero_dim }
- { \tex_kern:D -\l_coffin_offset_x_dim }
- \hbox_unpack:N \l_coffin_aligned_coffin
- \dim_set:Nn \l_coffin_tmp_dim
- { \l_coffin_offset_x_dim - \box_wd:N #1 + \box_wd:N #4 }
- \dim_compare:nNnT { \l_coffin_tmp_dim } < { \c_zero_dim }
- { \tex_kern:D -\l_coffin_tmp_dim }
- }
-% \end{macrocode}
-% The coffin structure is reset, and the corners are cleared: only
-% those from the two parent coffins are needed.
-% \begin{macrocode}
- \coffin_reset_structure:N \l_coffin_aligned_coffin
- \prop_clear:c
- {
- l_coffin_corners_ \tex_number:D \l_coffin_aligned_coffin _ prop
- }
- \coffin_update_poles:N \l_coffin_aligned_coffin
-% \end{macrocode}
-% The structures of the parent coffins are now transferred to the new
-% coffin, which requires that the appropriate offsets are applied. That
-% will then depend on whether any shift was needed.
-% \begin{macrocode}
- \dim_compare:nNnTF { \l_coffin_offset_x_dim } < { \c_zero_dim }
- {
- \coffin_offset_poles:Nnn #1 { -\l_coffin_offset_x_dim } { 0 pt }
- \coffin_offset_poles:Nnn #4 { 0 pt } { \l_coffin_offset_y_dim }
- \coffin_offset_corners:Nnn #1 { -\l_coffin_offset_x_dim } { 0 pt }
- \coffin_offset_corners:Nnn #4 { 0 pt } { \l_coffin_offset_y_dim }
- }
- {
- \coffin_offset_poles:Nnn #1 { 0 pt } { 0 pt }
- \coffin_offset_poles:Nnn #4
- { \l_coffin_offset_x_dim } { \l_coffin_offset_y_dim }
- \coffin_offset_corners:Nnn #1 { 0 pt } { 0 pt }
- \coffin_offset_corners:Nnn #4
- { \l_coffin_offset_x_dim } { \l_coffin_offset_y_dim }
- }
- \coffin_update_vertical_poles:NNN #1 #4 \l_coffin_aligned_coffin
- \coffin_set_eq:NN #1 \l_coffin_aligned_coffin
-}
-\cs_generate_variant:Nn \coffin_join:NnnNnnnn { c , Nnnc , cnnc }
-% \end{macrocode}
-%\end{macro}
-%
-%\begin{macro}{
-% \coffin_attach:NnnNnnnn ,
-% \coffin_attach:cnnNnnnn ,
-% \coffin_attach:Nnncnnnn ,
-% \coffin_attach:cnncnnnn ,
-% \coffin_attach_mark:NnnNnnnn ,
-%}
-% A more simple version of the above, as it simply uses the size of the
-% first coffin for the new one. This means that the work here is rather
-% simplified compared to the above code. The function used when marking
-% a position is hear also as it is similar but without the structure
-% updates.
-% \begin{macrocode}
-\cs_new_protected_nopar:Npn \coffin_attach:NnnNnnnn #1#2#3#4#5#6#7#8 {
- \coffin_align:NnnNnnnnN
- #1 {#2} {#3} #4 {#5} {#6} {#7} {#8} \l_coffin_aligned_coffin
- \box_set_ht:Nn \l_coffin_aligned_coffin { \box_ht:N #1 }
- \box_set_dp:Nn \l_coffin_aligned_coffin { \box_dp:N #1 }
- \box_set_wd:Nn \l_coffin_aligned_coffin { \box_wd:N #1 }
- \coffin_reset_structure:N \l_coffin_aligned_coffin
- \prop_set_eq:cc
- { l_coffin_corners_ \tex_number:D \l_coffin_aligned_coffin _prop }
- { l_coffin_corners_ \tex_number:D #1 _prop }
- \coffin_update_poles:N \l_coffin_aligned_coffin
- \coffin_offset_poles:Nnn #1 { 0 pt } { 0 pt }
- \coffin_offset_poles:Nnn #4
- { \l_coffin_offset_x_dim } { \l_coffin_offset_y_dim }
- \coffin_update_vertical_poles:NNN #1 #4 \l_coffin_aligned_coffin
- \coffin_set_eq:NN #1 \l_coffin_aligned_coffin
-}
-\cs_new_protected_nopar:Npn
- \coffin_attach_mark:NnnNnnnn #1#2#3#4#5#6#7#8 {
- \coffin_align:NnnNnnnnN
- #1 {#2} {#3} #4 {#5} {#6} {#7} {#8} \l_coffin_aligned_coffin
- \box_set_ht:Nn \l_coffin_aligned_coffin { \box_ht:N #1 }
- \box_set_dp:Nn \l_coffin_aligned_coffin { \box_dp:N #1 }
- \box_set_wd:Nn \l_coffin_aligned_coffin { \box_wd:N #1 }
- \box_set_eq:NN #1 \l_coffin_aligned_coffin
-}
-\cs_generate_variant:Nn \coffin_attach:NnnNnnnn { c , Nnnc , cnnc }
-% \end{macrocode}
-%\end{macro}
-%
-%\begin{macro}{\coffin_align:NnnNnnnnN}
-% The internal function aligns the two coffins into a third one, but
-% performs no corrections on the resulting coffin poles. The process
-% begins by finding the points of intersection for the poles for each
-% of the input coffins. Those for the first coffin are worked out after
-% those for the second coffin, as this allows the `primed'
-% storage area to be used for the second coffin. The `real' box
-% offsets are then calculated, before using these to re-box the
-% input coffins. The default poles are then set up, but the final result
-% will depend on how the bounding box is being handled.
-% \begin{macrocode}
-\cs_new_protected_nopar:Npn
- \coffin_align:NnnNnnnnN #1#2#3#4#5#6#7#8#9 {
- \coffin_calculate_intersection:Nnn #4 {#5} {#6}
- \dim_set:Nn \l_coffin_x_prime_dim { \l_coffin_x_dim }
- \dim_set:Nn \l_coffin_y_prime_dim { \l_coffin_y_dim }
- \coffin_calculate_intersection:Nnn #1 {#2} {#3}
- \dim_set:Nn \l_coffin_offset_x_dim
- { \l_coffin_x_dim - \l_coffin_x_prime_dim + #7 }
- \dim_set:Nn \l_coffin_offset_y_dim
- { \l_coffin_y_dim - \l_coffin_y_prime_dim + #8 }
- \hbox_set:Nn \l_coffin_aligned_internal_coffin
- {
- \box_use:N #1
- \tex_kern:D -\box_wd:N #1
- \tex_kern:D \l_coffin_offset_x_dim
- \box_move_up:nn { \l_coffin_offset_y_dim } { \box_use:N #4 }
- }
- \coffin_set_eq:NN #9 \l_coffin_aligned_internal_coffin
-}
-% \end{macrocode}
-%\end{macro}
-%
-%\begin{macro}{\coffin_offset_poles:Nnn}
-%\begin{macro}[aux]{\coffin_offset_pole:Nnnnnnn}
-% Transferring structures from one coffin to another requires that the
-% positions are updated by the offset between the two coffins. This is
-% done by mapping to the property list of the source coffins, moving
-% as appropriate and saving to the new coffin data structures. The
-% test for a "-" means that the structures from the parent coffins
-% are uniquely labelled and do not depend on the order of alignment.
-% The pay off for this is that "-" should not be used in coffin pole
-% or handle names, and that multiple alignments do not result in a
-% whole set of values.
-% \begin{macrocode}
-\cs_new_protected_nopar:Npn \coffin_offset_poles:Nnn #1#2#3 {
- \prop_map_inline:cn { l_coffin_poles_ \tex_number:D #1 _prop }
- { \coffin_offset_pole:Nnnnnnn #1 {##1} ##2 {#2} {#3} }
-}
-\cs_new_protected_nopar:Npn
- \coffin_offset_pole:Nnnnnnn #1#2#3#4#5#6#7#8 {
- \dim_set:Nn \l_coffin_x_dim { #3 + #7 }
- \dim_set:Nn \l_coffin_y_dim { #4 + #8 }
- \tl_if_in:nnTF {#2} { - }
- { \tl_set:Nn \l_coffin_tmp_tl { {#2} } }
- { \tl_set:Nn \l_coffin_tmp_tl { { #1 - #2 } } }
- \exp_last_unbraced:NNo \coffin_set_pole:Nnx \l_coffin_aligned_coffin
- { \l_coffin_tmp_tl }
- {
- { \dim_use:N \l_coffin_x_dim } { \dim_use:N \l_coffin_y_dim }
- {#5} {#6}
- }
-}
-% \end{macrocode}
-%\end{macro}
-%\end{macro}
-%
-%\begin{macro}{\coffin_offset_corners:Nnn}
-%\begin{macro}[aux]{\coffin_offset_corners:Nnnnn}
-% Saving the offset corners of a coffin is very similar, except that
-% there is no need to worry about naming: every corner can be saved
-% here as order is unimportant.
-% \begin{macrocode}
-\cs_new_protected_nopar:Npn \coffin_offset_corners:Nnn #1#2#3 {
- \prop_map_inline:cn { l_coffin_corners_ \tex_number:D #1 _prop }
- { \coffin_offset_corner:Nnnnn #1 {##1} ##2 {#2} {#3} }
-}
-\cs_new_protected_nopar:Npn \coffin_offset_corner:Nnnnn #1#2#3#4#5#6 {
- \prop_put:cnx
- { l_coffin_corners_ \tex_number:D \l_coffin_aligned_coffin _prop }
- { #1 - #2 }
- {
- { \dim_eval:n { #3 + #5 } }
- { \dim_eval:n { #4 + #6 } }
- }
-}
-% \end{macrocode}
-%\end{macro}
-%\end{macro}
-%
-%\begin{macro}{\coffin_update_vertical_poles:NNN}
-%\begin{macro}[aux]{\coffin_update_T:nnnnnnnnN}
-%\begin{macro}[aux]{\coffin_update_B:nnnnnnnnN}
-% The \texttt{T} and \texttt{B} poles will need to be recalculated
-% after alignment. These functions find the larger absolute value for
-% the poles, but this is of course only logical when the poles are
-% horizontal.
-% \begin{macrocode}
-\cs_new_protected_nopar:Npn \coffin_update_vertical_poles:NNN #1#2#3 {
- \coffin_get_pole:NnN #3 { #1 -T } \l_coffin_pole_a_tl
- \coffin_get_pole:NnN #3 { #2 -T } \l_coffin_pole_b_tl
- \exp_last_two_unbraced:Noo \coffin_update_T:nnnnnnnnN
- \l_coffin_pole_a_tl \l_coffin_pole_b_tl #3
- \coffin_get_pole:NnN #3 { #1 -B } \l_coffin_pole_a_tl
- \coffin_get_pole:NnN #3 { #2 -B } \l_coffin_pole_b_tl
- \exp_last_two_unbraced:Noo \coffin_update_B:nnnnnnnnN
- \l_coffin_pole_a_tl \l_coffin_pole_b_tl #3
-}
-\cs_new_protected_nopar:Npn
- \coffin_update_T:nnnnnnnnN #1#2#3#4#5#6#7#8#9 {
- \dim_compare:nNnTF {#2} < {#6}
- {
- \coffin_set_pole:Nnx #9 { T }
- { { 0 pt } {#6} { 1000 pt } { 0 pt } }
- }
- {
- \coffin_set_pole:Nnx #9 { T }
- { { 0 pt } {#2} { 1000 pt } { 0 pt } }
- }
-}
-\cs_new_protected_nopar:Npn
- \coffin_update_B:nnnnnnnnN #1#2#3#4#5#6#7#8#9 {
- \dim_compare:nNnTF {#2} < {#6}
- {
- \coffin_set_pole:Nnx #9 { B }
- { { 0 pt } {#2} { 1000 pt } { 0 pt } }
- }
- {
- \coffin_set_pole:Nnx #9 { B }
- { { 0 pt } {#6} { 1000 pt } { 0 pt } }
- }
-}
-% \end{macrocode}
-%\end{macro}
-%\end{macro}
-%\end{macro}
-%
-%\begin{macro}{
-% \coffin_typeset:Nnnnn ,
-% \coffin_typeset:cnnnn ,
-%}
-% Typesetting a coffin means aligning it with the current position,
-% which is done using a coffin with no content at all. This is done
-% using the same approach as \cs{coffin_align:NnnNnnnnN} but without the
-% offset corrections (which would be thrown away). The same is true
-% for overlaying coffins, which uses the known size of an empty
-% box!
-% \begin{macrocode}
-\cs_new_protected_nopar:Npn \coffin_typeset:Nnnnn #1#2#3#4#5 {
- \coffin_align:NnnNnnnnN \c_empty_coffin { H } { l }
- #1 {#2} {#3} {#4} {#5} \l_coffin_aligned_coffin
- \hbox_set:Nn \l_coffin_aligned_coffin
- {
- \dim_compare:nNnT { \l_coffin_offset_x_dim } < { \c_zero_dim }
- { \tex_kern:D -\l_coffin_offset_x_dim }
- \hbox_unpack:N \l_coffin_aligned_coffin
- \dim_set:Nn \l_coffin_tmp_dim
- { \l_coffin_offset_x_dim + \box_wd:N #1 }
- \dim_compare:nNnT { \l_coffin_tmp_dim } < { \c_zero_dim }
- { \tex_kern:D -\l_coffin_tmp_dim }
- }
- \hbox_unpack:N \c_empty_box
- \box_use:N \l_coffin_aligned_coffin
-}
-\cs_generate_variant:Nn \coffin_typeset:Nnnnn { c }
-% \end{macrocode}
-%\end{macro}
-%
-%\subsection{Rotating coffins}
-%
-%\begin{macro}{\l_coffin_bounding_prop}
-% A property list for the bounding box of a coffin. This is only needed
-% during the rotation, so there is just the one.
-% \begin{macrocode}
-\prop_new:N \l_coffin_bounding_prop
-% \end{macrocode}
-%\end{macro}
-%
-%\begin{macro}{\l_coffin_bounding_shift_dim}
-% The shift of the bounding box of a coffin from the real content.
-% \begin{macrocode}
-\dim_new:N \l_coffin_bounding_shift_dim
-% \end{macrocode}
-%\end{macro}
-%
-%\begin{macro}{\l_coffin_left_corner_dim}
-%\begin{macro}{\l_coffin_right_corner_dim}
-%\begin{macro}{\l_coffin_bottom_corner_dim}
-%\begin{macro}{\l_coffin_top_corner_dim}
-% These are used to hold maxima for the various corner values: these
-% thus define the minimum size of the bounding box after rotation.
-% \begin{macrocode}
-\dim_new:N \l_coffin_left_corner_dim
-\dim_new:N \l_coffin_right_corner_dim
-\dim_new:N \l_coffin_bottom_corner_dim
-\dim_new:N \l_coffin_top_corner_dim
-% \end{macrocode}
-%\end{macro}
-%\end{macro}
-%\end{macro}
-%\end{macro}
-%
-%\begin{macro}{
-% \coffin_rotate:Nn ,
-% \coffin_rotate:cn ,
-%}
-% Rotating a coffin requires several steps which can be conveniently
-% run together. The first step is to convert the angle given in degrees
-% to one in radians. This is then used to set \cs{l_coffin_sin_fp} and
-% \cs{l_coffin_cos_fp}, which are carried through unchanged for the rest
-% of the procedure.
-% \begin{macrocode}
-\cs_new_protected_nopar:Npn \coffin_rotate:Nn #1#2 {
- \fp_set:Nn \l_coffin_tmp_fp {#2}
- \fp_div:Nn \l_coffin_tmp_fp { 180 }
- \fp_mul:Nn \l_coffin_tmp_fp { \c_pi_fp }
- \fp_sin:Nn \l_coffin_sin_fp { \l_coffin_tmp_fp }
- \fp_cos:Nn \l_coffin_cos_fp { \l_coffin_tmp_fp }
-% \end{macrocode}
-% The corners and poles of the coffin can now be rotated around the
-% origin. This is best achieved using mapping functions.
-% \begin{macrocode}
- \prop_map_inline:cn { l_coffin_corners_ \tex_number:D #1 _prop }
- { \coffin_rotate_corner:Nnnn #1 {##1} ##2 }
- \prop_map_inline:cn { l_coffin_poles_ \tex_number:D #1 _prop }
- { \coffin_rotate_pole:Nnnnnn #1 {##1} ##2 }
-% \end{macrocode}
-% The bounding box of the coffin needs to be rotated, and to do this
-% the corners have to be found first. They are then rotated in the same
-% way as the corners of the coffin material itself.
-% \begin{macrocode}
- \coffin_set_bounding:N #1
- \prop_map_inline:Nn \l_coffin_bounding_prop
- { \coffin_rotate_bounding:nnn {##1} ##2 }
-% \end{macrocode}
-% At this stage, there needs to be a calculation to find where the
-% corners of the content and the box itself will end up.
-% \begin{macrocode}
- \coffin_find_corner_maxima:N #1
- \coffin_find_bounding_shift:
- \hbox_set:Nn #1 { \rotatebox {#2} { \box_use:N #1 } }
-% \end{macrocode}
-% The correction of the box position itself takes place here. The idea
-% is that the bounding box for a coffin is tight up to the content, and
-% has the reference point at the bottom-left. The \( x \)-direction is
-% handled by moving the content by the difference in the positions of
-% the bounding box and the content left edge. The \( y \)-direction is
-% dealt with by moving the box down by any depth it has acquired.
-% \begin{macrocode}
- \hbox_set:Nn #1
- {
- \tex_kern:D \l_coffin_bounding_shift_dim
- \tex_kern:D -\l_coffin_left_corner_dim
- \box_move_down:nn { \l_coffin_bottom_corner_dim }
- { \box_use:N #1 }
- }
-% \end{macrocode}
-% If there have been any previous rotations then the size of the
-% bounding box will be bigger than the contents. This can be corrected
-% easily by setting the size of the box to the height and width of the
-% content.
-% \begin{macrocode}
- \box_set_ht:Nn #1
- { \l_coffin_top_corner_dim - \l_coffin_bottom_corner_dim }
- \box_set_dp:Nn #1 { 0 pt }
- \box_set_wd:Nn #1
- { \l_coffin_right_corner_dim - \l_coffin_left_corner_dim }
-% \end{macrocode}
-% The final task is to move the poles and corners such that they are
-% back in alignment with the box reference point.
-% \begin{macrocode}
- \prop_map_inline:cn { l_coffin_corners_ \tex_number:D #1 _prop }
- { \coffin_shift_corner:Nnnn #1 {##1} ##2 }
- \prop_map_inline:cn { l_coffin_poles_ \tex_number:D #1 _prop }
- { \coffin_shift_pole:Nnnnnn #1 {##1} ##2 }
-}
-\cs_generate_variant:Nn \coffin_rotate:Nn { c }
-% \end{macrocode}
-%\end{macro}
-%
-%\begin{macro}{\coffin_set_bounding:N}
-% The bounding box corners for a coffin are easy enough to find: this
-% is the same code as for the corners of the material itself, but
-% using a dedicated property list.
-% \begin{macrocode}
-\cs_new_protected_nopar:Npn \coffin_set_bounding:N #1 {
- \prop_put:Nnx \l_coffin_bounding_prop { tl }
- { { 0 pt } { \dim_use:N \box_ht:N #1 } }
- \prop_put:Nnx \l_coffin_bounding_prop { tr }
- { { \dim_use:N \box_wd:N #1 } { \dim_use:N \box_ht:N #1 } }
- \dim_set:Nn \l_coffin_tmp_dim { - \dim_use:N \box_dp:N #1 }
- \prop_put:Nnx \l_coffin_bounding_prop { bl }
- { { 0 pt } { \dim_use:N \l_coffin_tmp_dim } }
- \prop_put:Nnx \l_coffin_bounding_prop { br }
- { { \dim_use:N \box_wd:N #1 } { \dim_use:N \l_coffin_tmp_dim } }
-}
-% \end{macrocode}
-%\end{macro}
-%
-%\begin{macro}{\coffin_rotate_bounding:nnn}
-%\begin{macro}{\coffin_rotate_corner:Nnnn}
-% Rotating the position of the corner of the coffin is just a case
-% of treating this as a vector from the reference point. The same
-% treatment is used for the corners of the material itself and the
-% bounding box.
-% \begin{macrocode}
-\cs_new_protected_nopar:Npn \coffin_rotate_bounding:nnn #1#2#3 {
- \coffin_rotate_vector:nnNN {#2} {#3} \l_coffin_x_dim \l_coffin_y_dim
- \prop_put:Nnx \l_coffin_bounding_prop {#1}
- { { \dim_use:N \l_coffin_x_dim } { \dim_use:N \l_coffin_y_dim } }
-}
-\cs_new_protected_nopar:Npn \coffin_rotate_corner:Nnnn #1#2#3#4 {
- \coffin_rotate_vector:nnNN {#3} {#4} \l_coffin_x_dim \l_coffin_y_dim
- \prop_put:cnx { l_coffin_corners_ \tex_number:D #1 _prop } {#2}
- { { \dim_use:N \l_coffin_x_dim } { \dim_use:N \l_coffin_y_dim } }
-}
-% \end{macrocode}
-%\end{macro}
-%\end{macro}
-%
-%\begin{macro}{\coffin_rotate_pole:Nnnnnn}
-% Rotating a single pole simply means shifting the co-ordinate of
-% the pole and its direction. The rotation here is about the bottom-left
-% corner of the coffin.
-% \begin{macrocode}
-\cs_new_protected_nopar:Npn \coffin_rotate_pole:Nnnnnn #1#2#3#4#5#6 {
- \coffin_rotate_vector:nnNN {#3} {#4} \l_coffin_x_dim \l_coffin_y_dim
- \coffin_rotate_vector:nnNN {#5} {#6}
- \l_coffin_x_prime_dim \l_coffin_y_prime_dim
- \coffin_set_pole:Nnx #1 {#2}
- {
- { \dim_use:N \l_coffin_x_dim } { \dim_use:N \l_coffin_y_dim }
- { \dim_use:N \l_coffin_x_prime_dim }
- { \dim_use:N \l_coffin_y_prime_dim }
- }
-}
-% \end{macrocode}
-%\end{macro}
-%
-%\begin{macro}{\coffin_rotate_vector:nnNN}
-% A rotation function, which needs only an input vector (as dimensions)
-% and an output space. The values \cs{l_coffin_cos_fp} and
-% \cs{l_coffin_sin_fp} should previously have been set up correctly.
-% Working this way means that the floating point work is kept to a
-% minimum: for any given rotation the sin and cosine values do no
-% change, after all.
-% \begin{macrocode}
-\cs_new_protected_nopar:Npn \coffin_rotate_vector:nnNN #1#2#3#4 {
- \fp_set_from_dim:Nn \l_coffin_x_fp {#1}
- \fp_set_from_dim:Nn \l_coffin_y_fp {#2}
- \fp_set_eq:NN \l_coffin_x_prime_fp \l_coffin_x_fp
- \fp_set_eq:NN \l_coffin_tmp_fp \l_coffin_y_fp
- \fp_mul:Nn \l_coffin_x_prime_fp { \l_coffin_cos_fp }
- \fp_mul:Nn \l_coffin_tmp_fp { \l_coffin_sin_fp }
- \fp_sub:Nn \l_coffin_x_prime_fp { \l_coffin_tmp_fp }
- \fp_set_eq:NN \l_coffin_y_prime_fp \l_coffin_y_fp
- \fp_set_eq:NN \l_coffin_tmp_fp \l_coffin_x_fp
- \fp_mul:Nn \l_coffin_y_prime_fp { \l_coffin_cos_fp }
- \fp_mul:Nn \l_coffin_tmp_fp { \l_coffin_sin_fp }
- \fp_add:Nn \l_coffin_y_prime_fp { \l_coffin_tmp_fp }
- \dim_set:Nn #3 { \fp_to_dim:N \l_coffin_x_prime_fp }
- \dim_set:Nn #4 { \fp_to_dim:N \l_coffin_y_prime_fp }
-}
-% \end{macrocode}
-%\end{macro}
-%
-%\begin{macro}{\coffin_find_corner_maxima:N}
-%\begin{macro}[aux]{\coffin_find_corner_maxima_aux:nn}
-% The idea here is to find the extremities of the content of the
-% coffin. This is done by looking for the smallest values for the bottom
-% and left corners, and the largest values for the top and right
-% corners. The values start at the maximum dimensions so that the
-% case where all are positive or all are negative works out correctly.
-% \begin{macrocode}
-\cs_new_protected_nopar:Npn \coffin_find_corner_maxima:N #1 {
- \dim_set:Nn \l_coffin_top_corner_dim { -\c_max_dim }
- \dim_set:Nn \l_coffin_right_corner_dim { -\c_max_dim }
- \dim_set:Nn \l_coffin_bottom_corner_dim { \c_max_dim }
- \dim_set:Nn \l_coffin_left_corner_dim { \c_max_dim }
- \prop_map_inline:cn { l_coffin_corners_ \tex_number:D #1 _prop }
- { \coffin_find_corner_maxima_aux:nn ##2 }
-}
-\cs_new_protected_nopar:Npn \coffin_find_corner_maxima_aux:nn #1#2 {
- \dim_set_min:Nn \l_coffin_left_corner_dim {#1}
- \dim_set_max:Nn \l_coffin_right_corner_dim {#1}
- \dim_set_min:Nn \l_coffin_bottom_corner_dim {#2}
- \dim_set_max:Nn \l_coffin_top_corner_dim {#2}
-}
-% \end{macrocode}
-%\end{macro}
-%\end{macro}
-%
-%\begin{macro}{\coffin_find_bounding_shift:}
-%\begin{macro}[aux]{\coffin_find_bounding_shift_aux:nn}
-% The approach to finding the shift for the bounding box is similar to
-% that for the corners. However, there is only one value needed here and
-% a fixed input property list, so things are a bit clearer.
-% \begin{macrocode}
-\cs_new_protected_nopar:Npn \coffin_find_bounding_shift: {
- \dim_set:Nn \l_coffin_bounding_shift_dim { \c_max_dim }
- \prop_map_inline:Nn \l_coffin_bounding_prop
- { \coffin_find_bounding_shift_aux:nn ##2 }
-}
-\cs_new_protected_nopar:Npn \coffin_find_bounding_shift_aux:nn #1#2 {
- \dim_set_min:Nn \l_coffin_bounding_shift_dim {#1}
-}
-% \end{macrocode}
-%\end{macro}
-%\end{macro}
-%
-%\begin{macro}{\coffin_shift_corner:Nnnn}
-%\begin{macro}{\coffin_shift_pole:Nnnnnn}
-% Shifting the corners and poles of a coffin means subtracting the
-% appropriate values from the \( x \)- and \( y \)-components. For
-% the poles, this means that the direction vector is unchanged.
-% \begin{macrocode}
-\cs_new_protected_nopar:Npn \coffin_shift_corner:Nnnn #1#2#3#4 {
- \prop_put:cnx { l_coffin_corners_ \tex_number:D #1 _ prop } {#2}
- {
- { \dim_eval:n { #3 - \l_coffin_left_corner_dim } }
- { \dim_eval:n { #4 - \l_coffin_bottom_corner_dim } }
- }
-}
-\cs_new_protected_nopar:Npn \coffin_shift_pole:Nnnnnn #1#2#3#4#5#6 {
- \prop_put:cnx { l_coffin_poles_ \tex_number:D #1 _ prop } {#2}
- {
- { \dim_eval:n { #3 - \l_coffin_left_corner_dim } }
- { \dim_eval:n { #4 - \l_coffin_bottom_corner_dim } }
- {#5} {#6}
- }
-}
-% \end{macrocode}
-%\end{macro}
-%\end{macro}
-%
-%\subsection{Resizing coffins}
-%
-%\begin{macro}{\l_coffin_scale_x_fp}
-%\begin{macro}{\l_coffin_scale_y_fp}
-% Storage for the scaling factors in \( x \) and \( y \), respectively.
-% \begin{macrocode}
-\fp_new:N \l_coffin_scale_x_fp
-\fp_new:N \l_coffin_scale_y_fp
-% \end{macrocode}
-%\end{macro}
-%\end{macro}
-%
-%\begin{macro}{\l_coffin_scaled_total_height_dim}
-%\begin{macro}{\l_coffin_scaled_width_dim}
-% When scaling, the values given have to be turned into absolute values.
-% \begin{macrocode}
-\dim_new:N \l_coffin_scaled_total_height_dim
-\dim_new:N \l_coffin_scaled_width_dim
-% \end{macrocode}
-%\end{macro}
-%\end{macro}
-%
-%\begin{macro}{
-% \coffin_resize:Nnn ,
-% \coffin_resize:cnn ,
-%}
-% Resizing a coffin begins by setting up the user-friendly names for
-% the dimensions of the coffin box. The new sizes are then turned into
-% scale factor. This is the same operation as takes place for the
-% underlying box, but that operation is grouped and so the same
-% calculation is done here.
-% \begin{macrocode}
-\cs_new_protected_nopar:Npn \coffin_resize:Nnn #1#2#3 {
- \coffin_set_user_dimensions:N #1
- \fp_set_from_dim:Nn \l_coffin_scale_x_fp {#2}
- \fp_set_from_dim:Nn \l_coffin_tmp_fp { \Width }
- \fp_div:Nn \l_coffin_scale_x_fp { \l_coffin_tmp_fp }
- \fp_set_from_dim:Nn \l_coffin_scale_y_fp {#3}
- \fp_set_from_dim:Nn \l_coffin_tmp_fp { \TotalHeight }
- \fp_div:Nn \l_coffin_scale_y_fp { \l_coffin_tmp_fp }
- \hbox_set:Nn #1 { \resizebox * {#2} {#3} { \box_use:N #1 } }
- \coffin_resize_common:Nnn #1 {#2} {#3}
-}
-\cs_generate_variant:Nn \coffin_resize:Nnn { c }
-% \end{macrocode}
-%\end{macro}
-%
-%\begin{macro}{\coffin_resize_common:Nnn}
-% The poles and corners of the coffin are scaled to the appropriate
-% places before actually resizing the underlying box.
-% \begin{macrocode}
-\cs_new_protected_nopar:Npn \coffin_resize_common:Nnn #1#2#3 {
- \prop_map_inline:cn { l_coffin_corners_ \tex_number:D #1 _prop }
- { \coffin_scale_corner:Nnnn #1 {##1} ##2 }
- \prop_map_inline:cn { l_coffin_poles_ \tex_number:D #1 _prop }
- { \coffin_scale_pole:Nnnnnn #1 {##1} ##2 }
-% \end{macrocode}
-% Negative \( x \)-scaling values will place the poles in the wrong
-% location: this is corrected here.
-% \begin{macrocode}
- \fp_compare:NNNT \l_coffin_scale_x_fp < \c_zero_fp
- {
- \prop_map_inline:cn { l_coffin_corners_ \tex_number:D #1 _prop }
- { \coffin_x_shift_corner:Nnnn #1 {##1} ##2 }
- \prop_map_inline:cn { l_coffin_poles_ \tex_number:D #1 _prop }
- { \coffin_x_shift_pole:Nnnnnn #1 {##1} ##2 }
- }
- \coffin_end_user_dimensions:
-}
-% \end{macrocode}
-%\end{macro}
-%
-%\begin{macro}{
-% \coffin_scale:Nnn ,
-% \coffin_scale:cnn ,
-%}
-% For scaling, the opposite calculation is done to find the new
-% dimensions for the coffin. Only the total height is needed, as this
-% is the shift required for corners and poles. The scaling is done
-% the \TeX\ way as this works properly with floating point values
-% without needing to use the \texttt{fp} module.
-% \begin{macrocode}
-\cs_new_protected_nopar:Npn \coffin_scale:Nnn #1#2#3 {
- \coffin_set_user_dimensions:N #1
- \fp_set:Nn \l_coffin_scale_x_fp {#2}
- \fp_set:Nn \l_coffin_scale_y_fp {#3}
- \fp_compare:NNNTF \l_coffin_scale_y_fp > \c_zero_fp
- { \l_coffin_scaled_total_height_dim #3 \TotalHeight }
- { \l_coffin_scaled_total_height_dim -#3 \TotalHeight }
- \fp_compare:NNNTF \l_coffin_scale_x_fp > \c_zero_fp
- { \l_coffin_scaled_width_dim -#2 \Width }
- { \l_coffin_scaled_width_dim #2 \Width }
- \hbox_set:Nn #1 { \scalebox {#2} [#3] { \box_use:N #1 } }
- \coffin_resize_common:Nnn #1
- { \l_coffin_scaled_width_dim } { \l_coffin_scaled_total_height_dim }
-}
-\cs_generate_variant:Nn \coffin_scale:Nnn { c }
-% \end{macrocode}
-%\end{macro}
-%
-%\begin{macro}{\coffin_scale_vector:nnNN}
-% This functions scales a vector from the origin using the pre-set scale
-% factors in \( x \) and \( y \). This is a much less complex operation
-% than rotation, and as a result the code is a lot clearer.
-% \begin{macrocode}
-\cs_new_protected_nopar:Npn \coffin_scale_vector:nnNN #1#2#3#4 {
- \fp_set_from_dim:Nn \l_coffin_tmp_fp {#1}
- \fp_mul:Nn \l_coffin_tmp_fp { \l_coffin_scale_x_fp }
- \dim_set:Nn #3 { \fp_to_dim:N \l_coffin_tmp_fp }
- \fp_set_from_dim:Nn \l_coffin_tmp_fp {#2}
- \fp_mul:Nn \l_coffin_tmp_fp { \l_coffin_scale_y_fp }
- \dim_set:Nn #4 { \fp_to_dim:N \l_coffin_tmp_fp }
-}
-% \end{macrocode}
-%\end{macro}
-%
-%\begin{macro}{\coffin_scale_corner:Nnnn}
-%\begin{macro}{\coffin_scale_pole:Nnnnnn}
-% Scaling both corners and poles is a simple calculation using the
-% preceding vector scaling.
-% \begin{macrocode}
-\cs_new_protected_nopar:Npn \coffin_scale_corner:Nnnn #1#2#3#4 {
- \coffin_scale_vector:nnNN {#3} {#4} \l_coffin_x_dim \l_coffin_y_dim
- \prop_put:cnx { l_coffin_corners_ \tex_number:D #1 _prop } {#2}
- { { \dim_use:N \l_coffin_x_dim } { \dim_use:N \l_coffin_y_dim } }
-}
-\cs_new_protected_nopar:Npn \coffin_scale_pole:Nnnnnn #1#2#3#4#5#6 {
- \coffin_scale_vector:nnNN {#3} {#4} \l_coffin_x_dim \l_coffin_y_dim
- \coffin_set_pole:Nnx #1 {#2}
- {
- { \dim_use:N \l_coffin_x_dim } { \dim_use:N \l_coffin_y_dim }
- {#5} {#6}
- }
-}
-% \end{macrocode}
-%\end{macro}
-%\end{macro}
-%
-%\begin{macro}{\coffin_x_shift_corner:Nnnn}
-%\begin{macro}{\coffin_x_shift_pole:Nnnnnn}
-% These functions correct for the \( x \) displacement that takes
-% place with a negative horizontal scaling.
-% \begin{macrocode}
-\cs_new_protected_nopar:Npn \coffin_x_shift_corner:Nnnn #1#2#3#4 {
- \prop_put:cnx { l_coffin_corners_ \tex_number:D #1 _prop } {#2}
- {
- { \the_tex:D \etex_dimexpr:D #3 + \box_wd:N #1 \scan_stop: } {#4}
- }
-}
-\cs_new_protected_nopar:Npn \coffin_x_shift_pole:Nnnnnn #1#2#3#4#5#6 {
- \prop_put:cnx { l_coffin_poles_ \tex_number:D #1 _prop } {#2}
- {
- { \the_tex:D \etex_dimexpr:D #3 + \box_wd:N #1 \scan_stop: } {#4}
- {#5} {#6}
- }
-}
-% \end{macrocode}
-%\end{macro}
-%\end{macro}
-%
-%\subsection{Coffin diagnostics}
-%
-%\begin{macro}{\l_coffin_display_coffin}
-%\begin{macro}{\l_coffin_display_coord_coffin}
-%\begin{macro}{\l_coffin_display_pole_coffin}
-% Used for printing coffins with data structures attached.
-% \begin{macrocode}
-\coffin_new:N \l_coffin_display_coffin
-\coffin_new:N \l_coffin_display_coord_coffin
-\coffin_new:N \l_coffin_display_pole_coffin
-% \end{macrocode}
-%\end{macro}
-%\end{macro}
-%\end{macro}
-%
-%\begin{macro}{\l_coffin_display_handles_prop}
-% This property list is used to print coffin handles at suitable
-% positions. The offsets are expressed as multiples of the basic offset
-% value, which therefore acts as a scale-factor.
-% \begin{macrocode}
-\prop_new:N \l_coffin_display_handles_prop
-\prop_put:Nnn \l_coffin_display_handles_prop { tl }
- { { b } { r } { -1 } { 1 } }
-\prop_put:Nnn \l_coffin_display_handles_prop { thc }
- { { b } { hc } { 0 } { 1 } }
-\prop_put:Nnn \l_coffin_display_handles_prop { tr }
- { { b } { l } { 1 } { 1 } }
-\prop_put:Nnn \l_coffin_display_handles_prop { vcl }
- { { vc } { r } { -1 } { 0 } }
-\prop_put:Nnn \l_coffin_display_handles_prop { vchc }
- { { vc } { hc } { 0 } { 0 } }
-\prop_put:Nnn \l_coffin_display_handles_prop { vcr }
- { { vc } { l } { 1 } { 0 } }
-\prop_put:Nnn \l_coffin_display_handles_prop { bl }
- { { t } { r } { -1 } { -1 } }
-\prop_put:Nnn \l_coffin_display_handles_prop { bhc }
- { { t } { hc } { 0 } { -1 } }
-\prop_put:Nnn \l_coffin_display_handles_prop { br }
- { { t } { l } { 1 } { -1 } }
-\prop_put:Nnn \l_coffin_display_handles_prop { Tl }
- { { t } { r } { -1 } { -1 } }
-\prop_put:Nnn \l_coffin_display_handles_prop { Thc }
- { { t } { hc } { 0 } { -1 } }
-\prop_put:Nnn \l_coffin_display_handles_prop { Tr }
- { { t } { l } { 1 } { -1 } }
-\prop_put:Nnn \l_coffin_display_handles_prop { Hl }
- { { vc } { r } { -1 } { 1 } }
-\prop_put:Nnn \l_coffin_display_handles_prop { Hhc }
- { { vc } { hc } { 0 } { 1 } }
-\prop_put:Nnn \l_coffin_display_handles_prop { Hr }
- { { vc } { l } { 1 } { 1 } }
-\prop_put:Nnn \l_coffin_display_handles_prop { Bl }
- { { b } { r } { -1 } { -1 } }
-\prop_put:Nnn \l_coffin_display_handles_prop { Bhc }
- { { b } { hc } { 0 } { -1 } }
-\prop_put:Nnn \l_coffin_display_handles_prop { Br }
- { { b } { l } { 1 } { -1 } }
-% \end{macrocode}
-%\end{macro}
-%
-%\begin{macro}{\l_coffin_display_offset_dim}
-% The standard offset for the label from the handle position when
-% displaying handles.
-% \begin{macrocode}
-\dim_new:N \l_coffin_display_offset_dim
-\dim_set:Nn \l_coffin_display_offset_dim { 2 pt }
-% \end{macrocode}
-%\end{macro}
-%
-%\begin{macro}{\l_coffin_display_x_dim}
-%\begin{macro}{\l_coffin_display_y_dim}
-% As the intersections of poles have to be calculated to find which
-% ones to print, there is a need to avoid repetition. This is done
-% by saving the intersection into two dedicated values.
-% \begin{macrocode}
-\dim_new:N \l_coffin_display_x_dim
-\dim_new:N \l_coffin_display_y_dim
-% \end{macrocode}
-%\end{macro}
-%\end{macro}
-%
-%\begin{macro}{\l_coffin_display_poles_prop}
-% A property list for printing poles: various things need to be deleted
-% from this to get a `nice' output.
-% \begin{macrocode}
-\prop_new:N \l_coffin_display_poles_prop
-% \end{macrocode}
-%\end{macro}
-%
-%\begin{macro}{\l_coffin_display_font_tl}
-% Stores the settings used to print coffin data: this keeps things
-% flexible.
-% \begin{macrocode}
-\tl_new:N \l_coffin_display_font_tl
-\tl_set:Nn \l_coffin_display_font_tl { \sffamily \tiny }
-% \end{macrocode}
-%\end{macro}
-%
-%\begin{macro}{\l_coffin_show_toks}
-% For the package the \LaTeXe\ code can be used.
-% \begin{macrocode}
-\cs_new_eq:NN \l_coffin_show_toks \toks@
-% \end{macrocode}
-%\end{macro}
-%
-%\begin{macro}{\l_coffin_handles_tmp_prop}
-% Used for displaying coffins, as the handles need to be stored in this
-% case, at least temporarily.
-% \begin{macrocode}
-\prop_new:N \l_coffin_handles_tmp_prop
-% \end{macrocode}
-%\end{macro}
-%
-%\begin{macro}{
-% \coffin_mark_handle:Nnnn ,
-% \coffin_mark_handle:cnnn ,
-%}
-%\begin{macro}[aux]{\coffin_mark_handle_aux:nnnnNnn}
-% Marking a single handle is relatively easy. The standard attachment
-% function is used, meaning that there are two calculations for the
-% location. However, this is likely to be okay given the load expected.
-% Contrast with the more optimised version for showing all handles which
-% comes next.
-% \begin{macrocode}
-\cs_new_protected_nopar:Npn \coffin_mark_handle:Nnnn #1#2#3#4 {
- \hcoffin_set:Nn \l_coffin_display_pole_coffin
- {
- \color {#4}
- \rule { 1 pt } { 1 pt }
- \hbox:n { \tex_vrule:D width 1 pt height 1 pt \scan_stop: } % TEMP
- }
- \coffin_attach_mark:NnnNnnnn #1 {#2} {#3}
- \l_coffin_display_pole_coffin { hc } { vc } { 0 pt } { 0 pt }
- \hcoffin_set:Nn \l_coffin_display_coord_coffin
- {
- \color {#4}
- \l_coffin_display_font_tl
- ( \tl_to_str:n { #2 , #3 } )
- }
- \prop_get:NnN \l_coffin_display_handles_prop
- { #2 #3 } \l_coffin_tmp_tl
- \quark_if_no_value:NTF \l_coffin_tmp_tl
- {
- \prop_get:NnN \l_coffin_display_handles_prop
- { #3 #2 } \l_coffin_tmp_tl
- \quark_if_no_value:NTF \l_coffin_tmp_tl
- {
- \coffin_attach_mark:NnnNnnnn #1 {#2} {#3}
- \l_coffin_display_coord_coffin { l } { vc }
- { 1 pt } { 0 pt }
- }
- {
- \exp_last_unbraced:No \coffin_mark_handle_aux:nnnnNnn
- \l_coffin_tmp_tl #1 {#2} {#3}
- }
- }
- {
- \exp_last_unbraced:No \coffin_mark_handle_aux:nnnnNnn
- \l_coffin_tmp_tl #1 {#2} {#3}
- }
-}
-\cs_new_protected_nopar:Npn
- \coffin_mark_handle_aux:nnnnNnn #1#2#3#4#5#6#7 {
- \coffin_attach_mark:NnnNnnnn #5 {#6} {#7}
- \l_coffin_display_coord_coffin {#1} {#2}
- { #3 \l_coffin_display_offset_dim }
- { #4 \l_coffin_display_offset_dim }
-}
-\cs_generate_variant:Nn \coffin_mark_handle:Nnnn { c }
-% \end{macrocode}
-%\end{macro}
-%\end{macro}
-%
-%\begin{macro}{
-% \coffin_display_handles:Nn ,
-% \coffin_display_handles:cn ,
-%}
-%\begin{macro}[aux]{\coffin_display_handles_aux:nnnnnn}
-%\begin{macro}[aux]{\coffin_display_handles_aux:nnnn}
-%\begin{macro}[aux]{\coffin_display_attach:Nnnnn}
-% Printing the poles starts by removing any duplicates, for which the
-% \texttt{H} poles is used as the definitive version for the baseline
-% and bottom. Two loops are then used to find the combinations of
-% handles for all of these poles. This is done such that poles are
-% removed during the loops to avoid duplication.
-% \begin{macrocode}
-\cs_new_protected_nopar:Npn \coffin_display_handles:Nn #1#2 {
- \hcoffin_set:Nn \l_coffin_display_pole_coffin
- {
- \color {#2}
- \rule { 1 pt } { 1 pt }
- }
- \prop_set_eq:Nc \l_coffin_display_poles_prop
- { l_coffin_poles_ \tex_number:D #1 _prop }
- \coffin_get_pole:NnN #1 { H } \l_coffin_pole_a_tl
- \coffin_get_pole:NnN #1 { T } \l_coffin_pole_b_tl
- \tl_if_eq:NNT \l_coffin_pole_a_tl \l_coffin_pole_b_tl
- { \prop_del:Nn \l_coffin_display_poles_prop { T } }
- \coffin_get_pole:NnN #1 { B } \l_coffin_pole_b_tl
- \tl_if_eq:NNT \l_coffin_pole_a_tl \l_coffin_pole_b_tl
- { \prop_del:Nn \l_coffin_display_poles_prop { B } }
- \coffin_set_eq:NN \l_coffin_display_coffin #1
- \prop_clear:N \l_coffin_handles_tmp_prop
- \prop_map_inline:Nn \l_coffin_display_poles_prop
- {
- \prop_del:Nn \l_coffin_display_poles_prop {##1}
- \coffin_display_handles_aux:nnnnnn {##1} ##2 {#2}
- }
- \box_use:N \l_coffin_display_coffin
-}
-% \end{macrocode}
-% For each pole there is a check for an intersection, which here does
-% not give an error if none is found. The successful values are stored
-% and used to align the pole coffin with the main coffin for output.
-% The positions are recovered from the preset list if available.
-% \begin{macrocode}
-\cs_new_protected_nopar:Npn
- \coffin_display_handles_aux:nnnnnn #1#2#3#4#5#6 {
- \prop_map_inline:Nn \l_coffin_display_poles_prop
- {
- \bool_set_false:N \l_coffin_error_bool
- \coffin_calculate_intersection:nnnnnnnn {#2} {#3} {#4} {#5} ##2
- \bool_if:NF \l_coffin_error_bool
- {
- \dim_set:Nn \l_coffin_display_x_dim { \l_coffin_x_dim }
- \dim_set:Nn \l_coffin_display_y_dim { \l_coffin_y_dim }
- \coffin_display_attach:Nnnnn
- \l_coffin_display_pole_coffin { hc } { vc }
- { 0 pt } { 0 pt }
- \hcoffin_set:Nn \l_coffin_display_coord_coffin
- {
- \color {#6}
- \l_coffin_display_font_tl
- ( \tl_to_str:n { #1 , ##1 } )
- }
- \prop_get:NnN \l_coffin_display_handles_prop
- { #1 ##1 } \l_coffin_tmp_tl
- \quark_if_no_value:NTF \l_coffin_tmp_tl
- {
- \prop_get:NnN \l_coffin_display_handles_prop
- { ##1 #1 } \l_coffin_tmp_tl
- \quark_if_no_value:NTF \l_coffin_tmp_tl
- {
- \coffin_display_attach:Nnnnn
- \l_coffin_display_coord_coffin { l } { vc }
- { 1 pt } { 0 pt }
- }
- {
- \exp_last_unbraced:No
- \coffin_display_handles_aux:nnnn
- \l_coffin_tmp_tl
- }
- }
- {
- \exp_last_unbraced:No \coffin_display_handles_aux:nnnn
- \l_coffin_tmp_tl
- }
- }
- }
-}
-\cs_new_protected_nopar:Npn \coffin_display_handles_aux:nnnn #1#2#3#4 {
- \coffin_display_attach:Nnnnn
- \l_coffin_display_coord_coffin {#1} {#2}
- { #3 \l_coffin_display_offset_dim }
- { #4 \l_coffin_display_offset_dim }
-}
-\cs_generate_variant:Nn \coffin_display_handles:Nn { c }
-% \end{macrocode}
-% This is a dedicated version of \cs{coffin_attach:NnnNnnnn} with
-% a hard-wired first coffin. As the intersection is already known
-% and stored for the display coffin the code simply uses it directly,
-% with no calculation.
-% \begin{macrocode}
-\cs_new_protected_nopar:Npn \coffin_display_attach:Nnnnn #1#2#3#4#5 {
- \coffin_calculate_intersection:Nnn #1 {#2} {#3}
- \dim_set:Nn \l_coffin_x_prime_dim { \l_coffin_x_dim }
- \dim_set:Nn \l_coffin_y_prime_dim { \l_coffin_y_dim }
- \dim_set:Nn \l_coffin_offset_x_dim
- { \l_coffin_display_x_dim - \l_coffin_x_prime_dim + #4 }
- \dim_set:Nn \l_coffin_offset_y_dim
- { \l_coffin_display_y_dim - \l_coffin_y_prime_dim + #5 }
- \hbox_set:Nn \l_coffin_aligned_coffin
- {
- \box_use:N \l_coffin_display_coffin
- \tex_kern:D -\box_wd:N \l_coffin_display_coffin
- \tex_kern:D \l_coffin_offset_x_dim
- \box_move_up:nn { \l_coffin_offset_y_dim } { \box_use:N #1 }
- }
- \box_set_ht:Nn \l_coffin_aligned_coffin
- { \box_ht:N \l_coffin_display_coffin }
- \box_set_dp:Nn \l_coffin_aligned_coffin
- { \box_dp:N \l_coffin_display_coffin }
- \box_set_wd:Nn \l_coffin_aligned_coffin
- { \box_wd:N \l_coffin_display_coffin }
- \box_set_eq:NN \l_coffin_display_coffin \l_coffin_aligned_coffin
-}
-% \end{macrocode}
-%\end{macro}
-%\end{macro}
-%\end{macro}
-%\end{macro}
-%
-%\begin{macro}{\coffin_show_structure:N}
-%\begin{macro}{\coffin_show_structure:c}
-% For showing the various internal structures attached to a coffin in
-% a way that keeps things relatively readable. If there is no apparent
-% structure then the code complains.
-% \begin{macrocode}
-\cs_new_protected_nopar:Npn \coffin_show_structure:N #1 {
- \toks_clear:N \l_coffin_show_toks
- \cs_if_exist:cTF { l_coffin_poles_ \tex_number:D #1 _prop }
- {
- \iow_term:x
- {
- \iow_newline:
- Size~of~coffin~\token_to_str:N #1 : \iow_newline:
- > ~ ht~=~\dim_use:N \box_ht:N #1 \iow_newline:
- > ~ dp~=~\dim_use:N \box_dp:N #1 \iow_newline:
- > ~ wd~=~\dim_use:N \box_wd:N #1 \iow_newline:
- }
- \iow_term:x { Poles~of~coffin~\token_to_str:N #1 : }
- \prop_map_inline:cn { l_coffin_poles_ \tex_number:D #1 _prop }
- {
- \toks_if_empty:NF \l_coffin_show_toks
- {
- \toks_put_right:Nx \l_coffin_show_toks
- { \iow_newline: > ~ }
- }
- \toks_put_right:Nx \l_coffin_show_toks
- { ~ \exp_not:n {##1} \c_space_tl => ~ \exp_not:n {##2} }
- }
- }
- {
- \iow_term:x { ---~No~poles~found~--- }
- \toks_put_right:Nn \l_coffin_show_toks
- { Is~this~really~a~coffin? }
- }
- \toks_show:N \l_coffin_show_toks
-}
-\cs_generate_variant:Nn \coffin_show_structure:N { c }
-% \end{macrocode}
-%\end{macro}
-%\end{macro}
-%
-%\subsection{Messages}
-%
-% \begin{macrocode}
-\msg_kernel_new:nnnn { coffin } { no-pole-intersection }
- { No~intersection~between~coffin~poles. }
- {
- \l_msg_coding_error_text_tl
- LaTeX~was~asked~to~find~the~intersection~between~two~poles,~
- but~they~do~not~have~a~unique~meeting~point:~
- the~value~(0~pt,~0~pt)~will~be~used.
- }
-\msg_kernel_new:nnnn { coffin } { unknown-coffin }
- { Unknown~coffin~'#1'. }
- { The~coffin~'#1'~was~never~defined. }
-\msg_kernel_new:nnnn { coffin } { unknown-coffin-pole }
- { Pole~'#1'~unknown~for~coffin~'#2'. }
- {
- \l_msg_coding_error_text_tl
- LaTeX~was~asked~to~find~a~typesetting~pole~for~a~coffin,~
- but~either~the~coffin~does~not~exist~or~the~pole~name~is~wrong.
- }
-% \end{macrocode}
-%
-% \begin{macro}{\exp_two_last_unbraced:Noo}
-% \begin{macrocode}
-\cs_new:Npn \exp_last_two_unbraced:Noo #1 #2 #3{
- \exp_after:wN \exp_after:wN \exp_after:wN #1 \exp_after:wN #2 #3
-}
-% \end{macrocode}
-% \end{macro}
-%
-% \begin{macrocode}
-%</package>
-% \end{macrocode}
-%
-%\end{implementation}
-%
-%\PrintChanges
-%
-%\PrintIndex \ No newline at end of file