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authorNorbert Preining <norbert@preining.info>2021-02-19 03:01:02 +0000
committerNorbert Preining <norbert@preining.info>2021-02-19 03:01:02 +0000
commitf670508774c35b585b520fa9217d156664b4cb2a (patch)
treefcf8e0722878a1789f7a4200d247850c1a39a647 /macros/latex/contrib/l3experimental/l3pdf.dtx
parent154cba57ad7bf6df84889efda0fa5cd8b1e54828 (diff)
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-% \iffalse meta-comment
-%
-%% File: l3pdf.dtx
-%
-% Copyright(C) 2019-2021 The LaTeX 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 "l3experimental 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|package>
-\RequirePackage{expl3}
-%</driver|package>
-%<*driver>
-\documentclass[full]{l3doc}
-\begin{document}
- \DocInput{\jobname.dtx}
-\end{document}
-%</driver>
-% \fi
-%
-% \title{^^A
-% The \pkg{l3pdf} package\\ Core PDF support^^A
-% }
-%
-% \author{^^A
-% The \LaTeX{} Project\thanks
-% {^^A
-% E-mail:
-% \href{mailto:latex-team@latex-project.org}
-% {latex-team@latex-project.org}^^A
-% }^^A
-% }
-%
-% \date{Released 2021-02-06}
-%
-% \maketitle
-%
-% \begin{documentation}
-%
-% \section{\pkg{l3pdf} documentation}
-%
-% \subsection{Objects}
-%
-% \begin{function}[added = 2019-06-02]{\pdf_object_new:nn}
-% \begin{syntax}
-% \cs{pdf_object_new:nn} \Arg{object} \Arg{type}
-% \end{syntax}
-% Declares \meta{object} as a PDF object of \meta{type}, which should be
-% one of
-% \begin{itemize}
-% \item \texttt{array}
-% \item \texttt{dict}
-% \item \texttt{fstream}
-% \item \texttt{stream}
-% \end{itemize}
-% The object may be referenced from this point on, and written later
-% using \cs{pdf_object_write:nn}.
-% \end{function}
-% \begin{function}[EXP, pTF, added=2020-05-15]{\pdf_object_if_exist:n}
-% \begin{syntax}
-% \cs{pdf_object_if_exist_p:n} \Arg{object}
-% \cs{pdf_object_if_exist:nTF} \Arg{object}
-% \end{syntax}
-% Tests whether an object with name \Arg{object} has been defined.
-% \end{function}
-% \begin{function}[added = 2019-06-02]
-% {\pdf_object_write:nn, \pdf_object_write:nx}
-% \begin{syntax}
-% \cs{pdf_object_write:nn} \Arg{object} \Arg{content}
-% \end{syntax}
-% Writes the \meta{content} as content of the \meta{object}. Depending on the
-% \meta{type} declared for the object, the format required for the
-% \meta{data} will vary
-% \begin{itemize}
-% \item[\texttt{array}] A space-separated list of values
-% \item[\texttt{dict}] Key--value pairs in the form
-% \texttt{/\meta{key} \meta{value}}
-% \item[\texttt{fstream}] Two brace groups: \meta{file name} and
-% \meta{file content}
-% \item[\texttt{stream}] Two brace groups: \meta{attributes (dictionary)}
-% and \meta{stream contents}
-% \end{itemize}
-% \end{function}
-%
-% \begin{function}[EXP, added = 2019-06-02]{\pdf_object_ref:n}
-% \begin{syntax}
-% \cs{pdf_object_ref:n} \Arg{object}
-% \end{syntax}
-% Inserts the appropriate information to reference the \meta{object}
-% in for example page resource allocation
-% \end{function}
-%
-% \begin{function}[added = 2019-06-02]
-% {\pdf_object_now:nn, \pdf_object_now:nx}
-% \begin{syntax}
-% \cs{pdf_object_now:nn} \Arg{type} \Arg{content}
-% \end{syntax}
-% Writes the \meta{content} as content of an anonymous object. Depending on the
-% \meta{type}, the format required for the \meta{data} will vary
-% \begin{itemize}
-% \item[\texttt{array}] A space-separated list of values
-% \item[\texttt{dict}] Key--value pairs in the form
-% \texttt{/\meta{key} \meta{value}}
-% \item[\texttt{fstream}] Two brace groups: \meta{file name} and
-% \meta{file content}
-% \item[\texttt{stream}] Two brace groups: \meta{attributes (dictionary)}
-% and \meta{stream contents}
-% \end{itemize}
-% \end{function}
-%
-% \begin{function}[EXP, added = 2019-06-02]{\pdf_object_last:}
-% \begin{syntax}
-% \cs{pdf_object_last:}
-% \end{syntax}
-% Inserts the appropriate information to reference the last \meta{object}
-% created. This is particularly useful for anonymous objects.
-% \end{function}
-%
-% \subsection{Version}
-%
-% \begin{function}[pTF, EXP, added = 2019-06-02]{\pdf_version_compare:Nn}
-% \begin{syntax}
-% \cs{pdf_version_compare:NnTF} \meta{comparator} \Arg{version} \Arg{true code} \Arg{false code}
-% \end{syntax}
-% Compares the version of the PDF being created with the \meta{version}
-% string specified, using the \meta{comparator}. Either the \meta{true code}
-% or \meta{false code} will be left in the output stream.
-% \end{function}
-%
-% \begin{function}[added = 2019-06-02]
-% {\pdf_version_gset:n, \pdf_version_min_gset:n}
-% \begin{syntax}
-% \cs{pdf_version_gset:n} \Arg{version}
-% \end{syntax}
-% Sets the \meta{version} of the PDF being created. The |min| version will
-% not alter the output version unless it is currently lower than the
-% \meta{version} requested.
-%
-% This function may only be used up to the point where the PDF file is
-% initialised.
-% \end{function}
-%
-% \begin{function}[EXP, added = 2019-06-02]
-% {\pdf_version:, \pdf_version_major:, \pdf_version_minor:}
-% \begin{syntax}
-% \cs{pdf_version:}
-% \end{syntax}
-% Expands to the currently-active PDF version.
-% \end{function}
-%
-% \subsection{Compression}
-%
-% \begin{function}[added = 2019-06-02]{\pdf_uncompress:}
-% \begin{syntax}
-% \cs{pdf_uncompress:}
-% \end{syntax}
-% Disables any compression of the PDF, where possible.
-%
-% This function may only be used up to the point where the PDF file is
-% initialised.
-% \end{function}
-%
-% \subsection{Destinations}
-%
-% Destinations are the places a link jumped too.
-% Unlike the name may suggest they don't described
-% an exact location in the PDF. Instead a destination contains a reference to
-% a page along with an instruction how to display this page.
-% The normally used \enquote{XYZ \textit{top left zoom}} for example instructs
-% the viewer to show the page with the given \textit{zoom} and
-% the top left corner at the \textit{top left} coordinates---which then gives
-% the impression that there is an anchor at this position.
-%
-% If an instruction takes a coordinate, it is calculated by the following
-% commands relative to the location the command is issued.
-% So to get a specific coordinate one has to move the command to the right place.
-%
-% \begin{function}[added = 2021-01-03]
-% {\pdf_destination:nn}
-% \begin{syntax}
-% \cs{pdf_destination:nn} \Arg{name} \Arg{type or integer}
-% \end{syntax}
-% This creates a destination. \Arg{type or integer} can be one of |fit|, |fith|,
-% |fitv|, |fitb|, |fitbh|, |fitbv|, |fitr|, |xyz|
-% or an integer representing a scale factor in percent.
-% |fitr| here gives only a lightweight version of |/FitR|:
-% The backend code defines |fitr| so that it will with pdf\LaTeX{} and
-% Lua\LaTeX{} use the coordinates of the surrounding box,
-% with \texttt{dvips} and \texttt{dvipdfmx} it falls back to |fit|.
-% For full control use \cs{pdf_destination:nnnn}.
-%
-% The keywords match to the PDF names as described in the following tabular.
-%
-% \medskip
-% \noindent\begin{tabular}{ll>{\raggedright\arraybackslash}p{6cm}}
-% \toprule
-% Keyword & PDF & Remarks \\ \midrule
-% |fit| & |/Fit|
-% & Fits the page to the window\\
-% |fith| & |/FitH| \textit{top}
-% & Fits the width of the page to the window \\
-% |fitv| & |/FitV| \textit{left}
-% & Fits the height of the page to the window \\
-% |fitb| & |/FitB|
-% & Fits the page bounding box to the window \\
-% |fitbh|& |/FitBH| \textit{top}
-% & Fits the width of the page bounding box to the window. \\
-% |fitbv|& |/FitBV| \textit{left}
-% & Fits the height of the page bounding box to the window. \\
-% |fitr| & |/FitR| \textit{left bottom right top}
-% & Fits the rectangle specified by the four coordinates to the window
-% (see above for the restrictions)\\
-% |xyz| & |/XYZ| \textit{left top} null
-% & Sets a coordinate but doesn't change the zoom.\\
-% \Arg{integer} & |/XYZ| \textit{left top zoom}
-% & Sets a coordinate and a zoom meaning \Arg{integer}\%.
-% \\\bottomrule
-% \end{tabular}
-%
-% \end{function}
-%
-% \begin{function}[added = 2021-01-17]
-% {\pdf_destination:nnnn}
-% \begin{syntax}
-% \cs{pdf_destination:nnnn} \Arg{name} \Arg{width} \Arg{height} \Arg{depth}
-% \end{syntax}
-% This creates a destination with |/FitR| type with the given dimensions relative
-% to the current location. The destination is in a box of size zero, but it doesn't
-% switch to horizontal mode.
-% \end{function}
-% \end{documentation}
-%
-% \begin{implementation}
-%
-% \section{\pkg{l3pdf} implementation}
-%
-% \begin{macrocode}
-%<*package>
-% \end{macrocode}
-%
-% \begin{macrocode}
-%<@@=pdf>
-% \end{macrocode}
-%
-% \begin{macrocode}
-\ProvidesExplPackage{l3pdf}{2021-02-06}{}
- {L3 Experimental core PDF support}
-% \end{macrocode}
-%
-% \begin{variable}{\s_@@_stop}
-% Internal scan marks.
-% \begin{macrocode}
-\scan_new:N \s_@@_stop
-% \end{macrocode}
-% \end{variable}
-%
-% \begin{variable}{\g_@@_init_bool}
-% A flag so we have some chance of avoiding setting things we are not
-% allowed to.
-% \begin{macrocode}
-\bool_new:N \g_@@_init_bool
-%<*package>
-\cs_if_exist:NT \documentclass
- {
- \AtBeginDocument
- { \bool_gset_true:N \g_@@_init_bool }
- }
-%</package>
-% \end{macrocode}
-% \end{variable}
-%
-% \subsection{Compression}
-%
-% \begin{macro}{\pdf_uncompress:}
-% Simple to do.
-% \begin{macrocode}
-\cs_new_protected:Npn \pdf_uncompress:
- {
- \bool_if:NF \g_@@_init_bool
- {
- \@@_backend_compresslevel:n { 0 }
- \@@_backend_compress_objects:n { \c_false_bool }
- }
- }
-% \end{macrocode}
-% \end{macro}
-%
-% \subsection{Objects}
-%
-% \begin{macro}{\pdf_object_new:nn, \pdf_object_write:nn, \pdf_object_write:nx}
-% \begin{macro}[pTF]{\pdf_object_if_exist:n}
-% \begin{macro}{\pdf_object_ref:n}
-% \begin{macro}{\pdf_object_now:nn, \pdf_object_now:nx}
-% \begin{macro}{\pdf_object_last:}
-% Simple to do.
-% \begin{macrocode}
-\cs_new_protected:Npn \pdf_object_new:nn #1#2
- { \@@_backend_object_new:nn {#1} {#2} }
-\prg_new_conditional:Npnn \pdf_object_if_exist:n #1 { p , T , F , TF }
- {
- \int_if_exist:cTF { c__pdf_backend_object_ \tl_to_str:n {#1} _int }
- { \prg_return_true: }
- { \prg_return_false:}
- }
-\cs_new_protected:Npn \pdf_object_write:nn #1#2
- { \@@_backend_object_write:nn {#1} {#2} }
-\cs_generate_variant:Nn \pdf_object_write:nn { nx }
-\cs_new:Npn \pdf_object_ref:n #1 { \@@_backend_object_ref:n {#1} }
-\cs_new_protected:Npn \pdf_object_now:nn #1#2
- { \@@_backend_object_now:nn {#1} {#2} }
-\cs_generate_variant:Nn \pdf_object_now:nn { nx }
-\cs_new:Npn \pdf_object_last: { \@@_backend_object_last: }
-% \end{macrocode}
-% \end{macro}
-% \end{macro}
-% \end{macro}
-% \end{macro}
-% \end{macro}
-%
-% \subsection{Version}
-%
-% \begin{macro}{\pdf_version_compare:Nn}
-% \begin{macro}
-% {
-% @@_version_compare_=:w ,
-% @@_version_compare_<:w ,
-% @@_version_compare_>:w
-% }
-% \begin{macrocode}
-% To compare version, we need to split the given value then deal with both
-% major and minor version
-\prg_new_conditional:Npnn \pdf_version_compare:Nn #1#2 { p , T , F , TF }
- { \use:c { @@_version_compare_ #1 :w } #2 . . \s_@@_stop }
-\cs_new:cpn { @@_version_compare_=:w } #1 . #2 . #3 \s_@@_stop
- {
- \bool_lazy_and:nnTF
- { \int_compare_p:nNn \@@_backend_version_major: = {#1} }
- { \int_compare_p:nNn \@@_backend_version_minor: = {#2} }
- { \prg_return_true: }
- { \prg_return_false: }
- }
-\cs_new:cpn { @@_version_compare_<:w } #1 . #2 . #3 \s_@@_stop
- {
- \bool_lazy_or:nnTF
- { \int_compare_p:nNn \@@_backend_version_major: < {#1} }
- {
- \bool_lazy_and_p:nn
- { \int_compare_p:nNn \@@_backend_version_major: = {#1} }
- { \int_compare_p:nNn \@@_backend_version_minor: < {#2} }
- }
- { \prg_return_true: }
- { \prg_return_false: }
- }
-\cs_new:cpn { @@_version_compare_>:w } #1 . #2 . #3 \s_@@_stop
- {
- \bool_lazy_or:nnTF
- { \int_compare_p:nNn \@@_backend_version_major: > {#1} }
- {
- \bool_lazy_and_p:nn
- { \int_compare_p:nNn \@@_backend_version_major: = {#1} }
- { \int_compare_p:nNn \@@_backend_version_minor: > {#2} }
- }
- { \prg_return_true: }
- { \prg_return_false: }
- }
-% \end{macrocode}
-% \end{macro}
-% \end{macro}
-%
-% \begin{macro}{\pdf_version_gset:n, \pdf_version_min_gset:n}
-% \begin{macro}{\@@_version_gset:w}
-% Split the version and set.
-% \begin{macrocode}
-\cs_new_protected:Npn \pdf_version_gset:n #1
- { \@@_version_gset:w #1 . . \s_@@_stop }
-\cs_new_protected:Npn \pdf_version_min_gset:n #1
- {
- \pdf_version_compare:NnT < {#1}
- { \@@_version_gset:w #1 . . \s_@@_stop }
- }
-\cs_new_protected:Npn \@@_version_gset:w #1 . #2 . #3\s_@@_stop
- {
- \bool_if:NF \g_@@_init_bool
- {
- \@@_backend_version_major_gset:n {#1}
- \@@_backend_version_minor_gset:n {#2}
- }
- }
-% \end{macrocode}
-% \end{macro}
-% \end{macro}
-%
-% \begin{macro}[EXP]{\pdf_version:, \pdf_version_major:, \pdf_version_minor:}
-% Wrappers.
-% \begin{macrocode}
-\cs_new:Npn \pdf_version:
- { \@@_backend_version_major: . \@@_backend_version_minor: }
-\cs_new:Npn \pdf_version_major: { \@@_backend_version_major: }
-\cs_new:Npn \pdf_version_minor: { \@@_backend_version_minor: }
-% \end{macrocode}
-% \end{macro}
-%
-% \subsection{Destinations}
-%
-% \begin{macro}{\pdf_destination:nn}
-% \begin{macrocode}
-\cs_new_protected:Npn \pdf_destination:nn #1 #2
- { \@@_backend_destination:nn {#1}{#2} }
-% \end{macrocode}
-% \end{macro}
-%
-% \begin{macro}{\pdf_destination:nnnn}
-% \begin{macrocode}
-\cs_new_protected:Npn \pdf_destination:nnnn #1 #2 #3 #4
- {
- \hbox_to_zero:n
- { \@@_backend_destination:nnnn {#1} {#2} {#3} {#4} }
- }
-% \end{macrocode}
-% \end{macro}
-% \begin{macrocode}
-%</package>
-% \end{macrocode}
-%
-% \end{implementation}
-%
-% \PrintIndex