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-% \iffalse meta-comment
-%
-%% File: l3drivers-basics.dtx
-%
-% Copyright (C) 2011-2019 The LaTeX3 Project
-%
-% It may be distributed and/or modified under the conditions of the
-% LaTeX Project Public License (LPPL), either version 1.3c of this
-% license or (at your option) any later version. The latest version
-% of this license is in the file
-%
-% https://www.latex-project.org/lppl.txt
-%
-% This file is part of the "l3kernel bundle" (The Work in LPPL)
-% and all files in that bundle must be distributed together.
-%
-% -----------------------------------------------------------------------
-%
-% The development version of the bundle can be found at
-%
-% https://github.com/latex3/latex3
-%
-% for those people who are interested.
-%
-%<*driver>
-\documentclass[full,kernel]{l3doc}
-\begin{document}
- \DocInput{\jobname.dtx}
-\end{document}
-%</driver>
-% \fi
-%
-% \title{^^A
-% The \textsf{l3drivers-basics} package\\ Driver basics^^A
-% }
-%
-% \author{^^A
-% The \LaTeX3 Project\thanks
-% {^^A
-% E-mail:
-% \href{mailto:latex-team@latex-project.org}
-% {latex-team@latex-project.org}^^A
-% }^^A
-% }
-%
-% \date{Released 2019-05-28}
-%
-% \maketitle
-%
-% \begin{documentation}
-%
-% \end{documentation}
-%
-% \begin{implementation}
-%
-% \section{\pkg{l3drivers-basics} Implementation}
-%
-% \begin{macrocode}
-%<*initex|package>
-%<@@=driver>
-% \end{macrocode}
-%
-% Whilst there is a reasonable amount of code overlap between drivers,
-% it is much clearer to have the blocks more-or-less separated than run
-% in together and DocStripped out in parts. As such, most of the following
-% is set up on a per-driver basis, though there is some common code (again
-% given in blocks not interspersed with other material).
-%
-% All the file identifiers are up-front so that they come out in the right
-% place in the files.
-% \begin{macrocode}
-%<*package>
-\ProvidesExplFile
-%<*dvipdfmx>
- {l3dvipdfmx.def}{2019-04-06}{}
- {L3 Experimental driver: dvipdfmx}
-%</dvipdfmx>
-%<*dvips>
- {l3dvips.def}{2019-04-06}{}
- {L3 Experimental driver: dvips}
-%</dvips>
-%<*dvisvgm>
- {l3dvisvgm.def}{2019-04-06}{}
- {L3 Experimental driver: dvisvgm}
-%</dvisvgm>
-%<*pdfmode>
- {l3pdfmode.def}{2019-04-06}{}
- {L3 Experimental driver: PDF mode}
-%</pdfmode>
-%<*xdvipdfmx>
- {l3xdvipdfmx.def}{2019-04-06}{}
- {L3 Experimental driver: xdvipdfmx}
-%</xdvipdfmx>
-%</package>
-% \end{macrocode}
-%
-% The order of the driver code here is such that we get somewhat logical
-% outcomes in terms of code sharing whilst keeping things readable. (Trying to
-% mix all of the code by concept is almost unmanageable.) The key parts which
-% are shared are
-% \begin{itemize}
-% \item Color support is either \texttt{dvips}-like or \texttt{pdfmode}-like.
-% \item \texttt{pdfmode} and \texttt{(x)dvipdfmx} share drawing routines.
-% \item \texttt{xdvipdfmx} is largely the same as \texttt{dvipdfmx} so
-% takes most of the same code.
-% \end{itemize}
-%
-% \begin{macro}{\@@_literal:e, \@@_literal:n, \@@_literal:x}
-% The one shared function for all drivers is access to the basic
-% \tn{special} primitive: it has slightly odd expansion behaviour
-% so a wrapper is provided.
-% \begin{macrocode}
-\cs_new_eq:NN \@@_literal:e \tex_special:D
-\cs_new_protected:Npn \@@_literal:n #1
- { \@@_literal:e { \exp_not:n {#1} } }
-\cs_generate_variant:Nn \@@_literal:n { x }
-% \end{macrocode}
-% \end{macro}
-%
-% \begin{variable}{\l_@@_internal_box}
-% A scratch box.
-% \begin{macrocode}
-\box_new:N \l_@@_internal_box
-% \end{macrocode}
-% \end{variable}
-%
-% \subsection{\texttt{dvips} driver}
-%
-% \begin{macrocode}
-%<*dvips>
-% \end{macrocode}
-%
-% \begin{macro}{\@@_literal_postscript:n, \@@_literal_postscript:x}
-% Literal PostScript can be included using a few low-level formats. Here,
-% we use the form with no positioning: this is overall more convenient as
-% a wrapper. Note that this does require that where position is important,
-% an appropriate wrapper is included.
-% \begin{macrocode}
-\cs_new_protected:Npn \@@_literal_postscript:n #1
- { \@@_literal:n { ps:: #1 } }
-\cs_generate_variant:Nn \@@_literal_postscript:n { x }
-% \end{macrocode}
-% \end{macro}
-%
-% \begin{macro}{\@@_postscript:n, \@@_postscript:x}
-% PostScript data that does have positioning, and also applying
-% a shift to |SDict| (which is not done automatically by
-% |ps:| or |ps::|, in contrast to |!| or |"|).
-% \begin{macrocode}
-\cs_new_protected:Npn \@@_postscript:n #1
- { \@@_literal:n { ps: SDict ~ begin ~ #1 ~ end } }
-\cs_generate_variant:Nn \@@_postscript:n { x }
-% \end{macrocode}
-% \end{macro}
-%
-% \begin{macro}{\@@_postscript_header:n}
-% PostScript for the header: a small saving but makes the code clearer.
-% This is held until the start of shipout such that a document with no
-% actual output does not write anything.
-% \begin{macrocode}
-\cs_new_protected:Npx \@@_postscript_header:n #1
-%<*initex>
- { \@@_literal:n { ! #1 } }
-%</initex>
-%<*package>
- {
- \cs_if_exist:NTF \AtBeginDvi
- { \exp_not:N \AtBeginDvi }
- { \use:n }
- { \@@_literal:n { ! #1 } }
- }
-%</package>
-% \end{macrocode}
-% \end{macro}
-%
-% \begin{macro}{\@@_align_currentpoint_begin:, \@@_align_currentpoint_end:}
-% In \texttt{dvips} there is no build-in saving of the current
-% position, and so some additional PostScript is required to set up the
-% transformation matrix and also to restore it afterwards. Notice the use
-% of the stack to save the current position \enquote{up front} and to
-% move back to it at the end of the process. Notice that the |[begin]|/^^A
-% |[end]| pair here mean that we can use a run of PostScript statements
-% in separate lines: not \emph{required} but does make the code and
-% output more clear.
-% \begin{macrocode}
-\cs_new_protected:Npn \@@_align_currentpoint_begin:
- {
- \@@_literal:n { ps::[begin] }
- \@@_literal_postscript:n { currentpoint }
- \@@_literal_postscript:n { currentpoint~translate }
- }
-\cs_new_protected:Npn \@@_align_currentpoint_end:
- {
- \@@_literal_postscript:n { neg~exch~neg~exch~translate }
- \@@_literal:n { ps::[end] }
- }
-% \end{macrocode}
-% \end{macro}
-%
-% \begin{macro}{\@@_scope_begin:, \@@_scope_end:}
-% Saving/restoring scope for general operations needs to be done with
-% \texttt{dvips} positioning (try without to see this!). Thus we need the
-% |ps:| version of the special here. As only the graphics state is ever
-% altered within this pairing, we use the lower-cost |g|-versions.
-% \begin{macrocode}
-\cs_new_protected:Npn \@@_scope_begin:
- { \@@_literal:n { ps:gsave } }
-\cs_new_protected:Npn \@@_scope_end:
- { \@@_literal:n { ps:grestore } }
-% \end{macrocode}
-% \end{macro}
-%
-% \begin{macrocode}
-%</dvips>
-% \end{macrocode}
-%
-% \subsection{\texttt{pdfmode} driver}
-%
-% \begin{macrocode}
-%<*pdfmode>
-% \end{macrocode}
-%
-% The direct PDF driver covers both \pdfTeX{} and \LuaTeX{}. The latter
-% renames and restructures the driver primitives but this can be handled
-% at one level of abstraction. As such, we avoid using two separate drivers
-% for this material at the cost of some \texttt{x}-type definitions to get
-% everything expanded up-front.
-%
-% \begin{macro}{\@@_literal_pdf:n, \@@_literal_pdf:x}
-% This is equivalent to \verb|\special{pdf:}| but the engine can
-% track it. Without the \texttt{direct} keyword everything is kept in
-% sync: the transformation matrix is set to the current point automatically.
-% Note that this is still inside the text (\texttt{BT} \dots \texttt{ET}
-% block).
-% \begin{macrocode}
-\cs_new_protected:Npx \@@_literal_pdf:n #1
- {
- \cs_if_exist:NTF \tex_pdfextension:D
- { \tex_pdfextension:D literal }
- { \tex_pdfliteral:D }
- { \exp_not:N \exp_not:n {#1} }
- }
-\cs_generate_variant:Nn \@@_literal_pdf:n { x }
-% \end{macrocode}
-% \end{macro}
-%
-% \begin{macro}{\@@_scope_begin:, \@@_scope_end:}
-% Higher-level interfaces for saving and restoring the graphic state.
-% \begin{macrocode}
-\cs_new_protected:Npx \@@_scope_begin:
- {
- \cs_if_exist:NTF \tex_pdfextension:D
- { \tex_pdfextension:D save \scan_stop: }
- { \tex_pdfsave:D }
- }
-\cs_new_protected:Npx \@@_scope_end:
- {
- \cs_if_exist:NTF \tex_pdfextension:D
- { \tex_pdfextension:D restore \scan_stop: }
- { \tex_pdfrestore:D }
- }
-% \end{macrocode}
-% \end{macro}
-%
-% \begin{macro}{\@@_matrix:n, \@@_matrix:x}
-% Here the appropriate function is set up to insert an affine matrix
-% into the PDF. With \pdfTeX{} and \LuaTeX{} in direct PDF output mode there
-% is a primitive for this, which only needs the rotation/scaling/skew part.
-% \begin{macrocode}
-\cs_new_protected:Npx \@@_matrix:n #1
- {
- \cs_if_exist:NTF \tex_pdfextension:D
- { \tex_pdfextension:D setmatrix }
- { \tex_pdfsetmatrix:D }
- { \exp_not:N \exp_not:n {#1} }
- }
-\cs_generate_variant:Nn \@@_matrix:n { x }
-% \end{macrocode}
-% \end{macro}
-%
-% \begin{macrocode}
-%</pdfmode>
-% \end{macrocode}
-%
-% \subsection{\texttt{dvipdfmx} driver}
-%
-% \begin{macrocode}
-%<*dvipdfmx|xdvipdfmx>
-% \end{macrocode}
-%
-% The \texttt{dvipdfmx} shares code with the PDF mode one (using the common
-% section to this file) but also with \texttt{xdvipdfmx}. The latter is close
-% to identical to \texttt{dvipdfmx} and so all of the code here is extracted
-% for both drivers, with some \texttt{clean up} for \texttt{xdvipdfmx} as
-% required.
-%
-% \begin{macro}{\@@_literal_pdf:n, \@@_literal_pdf:x}
-% Equivalent to \texttt{pdf:content} but favored as the link to
-% the \pdfTeX{} primitive approach is clearer.
-% \begin{macrocode}
-\cs_new_protected:Npn \@@_literal_pdf:n #1
- { \@@_literal:n { pdf:literal~ #1 } }
-\cs_generate_variant:Nn \@@_literal_pdf:n { x }
-% \end{macrocode}
-% \end{macro}
-%
-% \begin{macro}{\@@_scope_begin:, \@@_scope_end:}
-% Scoping is done using the driver-specific specials.
-% \begin{macrocode}
-\cs_new_protected:Npn \@@_scope_begin:
- { \@@_literal:n { x:gsave } }
-\cs_new_protected:Npn \@@_scope_end:
- { \@@_literal:n { x:grestore } }
-% \end{macrocode}
-% \end{macro}
-%
-% \begin{macrocode}
-%</dvipdfmx|xdvipdfmx>
-% \end{macrocode}
-%
-% \subsection{\texttt{dvisvgm} driver}
-%
-% \begin{macrocode}
-%<*dvisvgm>
-% \end{macrocode}
-%
-% \begin{macro}{\@@_literal_svg:n, \@@_literal_svg:x}
-% Unlike the other drivers, the requirements for making SVG files mean
-% that we can't conveniently transform all operations to the current point.
-% That makes life a bit more tricky later as that needs to be accounted for.
-% A new line is added after each call to help to keep the output readable
-% for debugging.
-% \begin{macrocode}
-\cs_new_protected:Npn \@@_literal_svg:n #1
- { \@@_literal:n { dvisvgm:raw~ #1 { ?nl } } }
-\cs_generate_variant:Nn \@@_literal_svg:n { x }
-% \end{macrocode}
-% \end{macro}
-%
-% \begin{macro}{\@@_scope_begin:, \@@_scope_end:}
-% A scope in SVG terms is slightly different to the other drivers as
-% operations have to be \enquote{tied} to these not simply inside them.
-% \begin{macrocode}
-\cs_new_protected:Npn \@@_scope_begin:
- { \@@_literal_svg:n { <g> } }
-\cs_new_protected:Npn \@@_scope_end:
- { \@@_literal_svg:n { </g> } }
-% \end{macrocode}
-% \end{macro}
-%
-% \begin{macro}{\@@_scope_begin:n, \@@_scope_begin:x}
-% In SVG transformations, clips and so on are attached directly to scopes so
-% we need a way or allowing for that. This is rather more useful than
-% \cs{@@_scope_begin:} as a result. No assumptions are made about the nature
-% of the scoped operation(s).
-% \begin{macrocode}
-\cs_new_protected:Npn \@@_scope_begin:n #1
- { \@@_literal_svg:n { <g~ #1 > } }
-\cs_generate_variant:Nn \@@_scope_begin:n { x }
-% \end{macrocode}
-% \end{macro}
-%
-% \begin{macrocode}
-%</dvisvgm>
-% \end{macrocode}
-%
-% \begin{macrocode}
-%</initex|package>
-% \end{macrocode}
-%
-% \end{implementation}
-%
-% \PrintIndex