% \iffalse meta-comment
%
%% File: l3pdftools.dtx
%
% Copyright (C) 2018-2023 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 "LaTeX PDF management testphase 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/pdfresources
%
% for those people who are interested.
%
%<*driver>
\DocumentMetadata{pdfstandard=A-2b}
\documentclass[full]{l3doc}
\usepackage{array,booktabs}
\hypersetup{pdfauthor=The LaTeX Project,pdftitle=l3pdftools (LaTeX PDF management testphase bundle)}

\providecommand\potentialclash{\noindent\llap{\dbend\ }}
\begin{document}
  \DocInput{\jobname.dtx}
\end{document}
%</driver>
% \fi
%
% \title{^^A
%   The \pkg{l3pdftools} module\\ temporary collection of pdf related commands ^^A
%   \\ LaTeX PDF management testphase bundle
% }
%
% \author{^^A
%  The \LaTeX{} Project\thanks
%    {^^A
%      E-mail:
%        \href{mailto:latex-team@latex-project.org}
%          {latex-team@latex-project.org}^^A
%    }^^A
% }
%
% \date{Version 0.95x, released 2023-03-09}
%
% \maketitle
% \begin{documentation}
%
% \section{\pkg{l3pdftools} documentation}
%
% This module collects a number of candidate commands for the l3pdf module
%
% \begin{function}[EXP,added=2021-02-14]
%   {\pdf_name_from_unicode_e:n}
%  \begin{syntax}
%   \cs{pdf_name_from_unicode_e:n}  \Arg{content}
%  \end{syntax}
%  This converts \meta{content} to a format suitable for a PDF Name.
%  The output depends on the backend: For almost all backends
%  it will first expand the content with \cs{text_expand:n} and
%  then escape it in the way needed in a PDF Name with
%  \cs{str_convert_pdfname:e}, and at last prepend a slash before.
%  Typically such names use only ascii,
%  but non-ascii is supported, but should be utf8 encoded. For example\\
%  |\pdf_name_from_unicode_e:n {A~B\c_percent_str C\c_hash_str D€}}|\\
%   will    output |/A#20B#25C#23D#E2#82#AC|.
%
%  With dvips it will expand the content with \cs{text_expand:n} and then wrap it
%  in a |cvn| operation (\enquote{convert to name}).
%  So the example above will output |(A B%C#D€) cvn| to
%  the postscript. The content should not contain unbalanced parentheses with dvips.
%
% \end{function}
% \begin{function}[added=2020-07-04]
%   {\pdf_string_from_unicode:nnN}
%  \begin{syntax}
%   \cs{pdf_string_from_unicode:nnN}  \Arg{format}  \Arg{content} \Arg{tlvar}
%  \end{syntax}
%  This converts \meta{content} following the rules defined by \meta{format} and stores
%  the result in \meta{tlvar}. The assignment is done locally.
%  Non-ascii input should be utf8 encoded.
%  Currently the following formats exist:
%  \begin{description}
%     \item[utf8/string-raw]
%      this converts with \cs{str_set_convert:Nnnn} into utf8/string.
%     \item[utf8/string]
%      this converts into utf8/string and adds parentheses around the result.%
%     \item[utf8/URI-raw]
%      this converts with \cs{str_set_convert:Nnnn} into utf8/url and
%      then replaces reserved and digits back from the percent encoding. Parentheses
%      are escaped.
%     \item[utf8/URI]
%      this converts into utf8/URI  and adds parentheses around the result.%
%     \item[utf16/string-raw]
%      this converts with \cs{str_set_convert:Nnnn} into utf16/string.
%     \item[utf16/string]
%      this converts into utf16/string and adds parentheses around the result.
%     \item[utf16/hex-raw]
%      this converts into utf16/hex
%     \item[utf16/hex]
%     this converts into utf16/hex and adds bracket around the result.
%   \end{description}
% \end{function}
%
% \subsection{BDC operator / Properties resource}
% \begin{NOTE}{UF}
%  we need a switch for the case that the resource should be added to
%  xform resource instead of a page resources, see pdfbase.sty
% - xdvipdfmx: looks fine, the resource is added to the xform resource automatically
% - pdftex should now work okay too
% \end{NOTE}
% Entries to the /Properties dictionary in the page resources can
% be added with dvips only through side-effects: if a BDC-mark is created
% dvips/ghostscript will automatically create the necessary objects and names.
% To get a sensible abstraction the code does the same for the other backends if the
% core management code has been activated. This means that the behaviour
% of the command is different then. The \cs{pdf_bdcobject:..} should only be used
% if the management is active.
% \begin{function}[updated = 2020-07-03]
%   {
%     \pdf_bdc:nn
%   }
%   \begin{syntax}
%     \cs{pdf_bdc:nn} \Arg{tag} \Arg{dictionary content}
%   \end{syntax}
%    This command adds a BDC marked content operator to the current page stream.
%   \meta{tag} is the tag of this operator (without the leading slash),
%   \meta{dictionary content} is the content of the second argument.
%   If the PDF resource management is active an dictionary object with the
%   content is created and referenced with a name in the BDC operator.
%   Without the resource management the content is used directly. It then
%   depends on the backend how it is handled: with dvips a name is used
%   while the pdfmode engines and dvipdfmx write the content into the stream.
%
% \end{function}
% \begin{function}[added = 2020-07-03]
%   {
%     \pdf_bdcobject:nn
%   }
%   \begin{syntax}
%     \cs{pdf_bdcobject:nn} \Arg{tag} \Arg{object name}
%   \end{syntax}
%   This command adds a BDC marked content operator to the current page stream.
%   \meta{tag} is the tag of this operator (without the leading slash),
%   \meta{object name}  is a the name of an dictionary object reserved with
%   \cs{pdf_object_new:n} and filled with \cs{pdf_object_write:nnn} with
%   the properties of the BDC. Reusing a predefined object can save space
%   but the command works correctly
%   only if the resources management has been activated and should be used only
%   if this can be ensured.
% \end{function}
% \begin{function}[updated = 2020-07-03]
%   {
%     \pdf_bdcobject:n
%   }
%   \begin{syntax}
%     \cs{pdf_bdcobject:n} \Arg{tag}
%   \end{syntax}
%    This command adds a BDC marked content operator to the current page stream.
%   \meta{tag} is the tag of this operator (without the leading slash).
%   As object this commands uses the last anonymous dictionary object created with
%   \cs{pdf_object_unnamed_write:nn}. It lies in the responsibility of the user that the last
%   object is the wanted one. Like with \cs{pdf_bdcobject:nn} the command works correctly
%   only if the resources management has been activated and should be used only
%   if this can be ensured.
% \end{function}
% \begin{function}[added = 2019-10-17]
%   {
%     \pdf_bmc:n
%   }
%   \begin{syntax}
%     \cs{pdf_bmc:n} \Arg{tag}
%   \end{syntax}
%    This command created a BMC marked content operator. The argument is the
%    tag without the leading slash. It can be e.g. used for simple artifact
%    markers.
% \end{function}
% \begin{function}[added = 2019-06-30]
%   {
%     \pdf_emc:
%   }
%   \begin{syntax}
%     \cs{pdf_emc:}
%   \end{syntax}
%    This command closes the  BDC marked content operator opened with \cs{pdf_bdc:nn}.
%    It should be on the same page as the bdc-command.
%
%   \begin{verbatim}
%   \pdf_object_new:n     {module/objA}
%   \pdf_object_write:nnn {module/objA}{dict}{/Type/Artifact}
%   \pdf_bdc:nn {Span}{module/objA}
%   text
%   \pdf_emc:
%   \end{verbatim}
% \end{function}
%
%
% \end{documentation}
%
% \begin{implementation}
%
% \section{\pkg{l3pdftools} implementation}
%
%    \begin{macrocode}
%<*header>
\ProvidesExplPackage{l3pdftools}{2023-03-09}{0.95x}
  {candidate commands for l3pdf---LaTeX PDF management testphase bundle}
%</header>
%    \end{macrocode}
%
%    \begin{macrocode}
%<@@=pdf>
%<*package>
%    \end{macrocode}
% \subsection{Conversions and export functions}
% \begin{macro}{\pdf_name_from_unicode_e:n,\pdf_name_from_unicode_e:V}
%    \begin{macrocode}
\cs_generate_variant:Nn \str_convert_pdfname:n { e }

\cs_new:Npn \pdf_name_from_unicode_e:n #1
  {
    \__kernel_pdf_name_from_unicode_e:n { #1 }
  }

\cs_generate_variant:Nn \pdf_name_from_unicode_e:n {V}
%    \end{macrocode}
% \end{macro}
%
% The convert command must use a different value the source encoding
% depending on the engines. Until the PR in str-convert is active we add the alias here
% too
%    \begin{macrocode}
\bool_lazy_any:nTF
  {
    \sys_if_engine_luatex_p:
    \sys_if_engine_xetex_p:
  }
  {
    \prop_gput:Nnn \g__str_alias_prop { default } {  }
  }
  {
    \prop_gput:Nnn \g__str_alias_prop { default } { utf8 }
  }
%    \end{macrocode}
% \begin{macro}{\pdf_string_from_unicode:nnN}
%    \begin{macrocode}
\cs_new:Npn \pdf_string_from_unicode:nnN #1 #2 #3
  {
    \cs_if_exist_use:cF { @@_string_from_unicode_#1:nN }
      {
        \__kernel_msg_error:nnn { pdf } { unknown-convert } {#1}
        \use_none:nn
      }
    { #2 } #3
  }

\cs_generate_variant:Nn \pdf_string_from_unicode:nnN {nVN}
%    \end{macrocode}
% \end{macro}
% Most converter are simply wrapper around the str-convert commands and so
% use the same names, with the addition raw if no delimiters are added.
% The exception is the one for url's: it reverts most of the percent encodings
% and escapes the parentheses.
% That's why its name is URI instead of url. The current code is probably quite
% slow and will need a replacement.
% \begin{macro}{ @@_string_from_unicode_utf8/string-raw:nN }
% \begin{macro}{ @@_string_from_unicode_utf8/string:nN }
% \begin{macro}{ @@_string_from_unicode_utf8/URI-raw:nN }
% \begin{macro}{ @@_string_from_unicode_utf8/URI:nN }
% \begin{macro}{ @@_string_from_unicode_utf16/string-raw:nN }
% \begin{macro}{ @@_string_from_unicode_utf16/string:nN }
% \begin{macro}{ @@_string_from_unicode_utf16/hex-raw:nN }
% \begin{macro}{ @@_string_from_unicode_utf16/hex:nN }
%    \begin{macrocode}
%% TODO Names need a review when it is clear which converters
%% are actually needed
%% string conversions and printing
%% we assume here that the text purify step has been done. The input is
%% a list of (utf8) chars.
%% str convert, not expandable.
%  filespec (attachment view)  tests:
%  utf8:  gr\303\274\303\237e.txt
%    %doesn't work, umlaut wrong,
%  utf8 with BOM \357\273\277gr\303\274\303\237e.txt
%    %doesn't work, umlaut wrong, bom visible
%  utf16 with BE: (FEFF)
%   \376\377\000g\000r\000\374\000\337\000e\000.\000t\000x\000t %works
%                xetex converts to <feff0067007200fc00df0065002e007400780074>
%  utf16 with BE / HEX: <FEFF0067007200FC00DF0065002E007400780074> works

% bookmarks: as pdfoutline uses () currently only utf16 with BE is usable.
% check if one can use HEX too when directly writing the object
% ==========
% uri: utf16BE/string seems not to work, hex neither
%      utf8/string works but not on macos,
%      so a specfic utf8/url variant is needed
% ==========
% "input" is utf8 for pdftex, empty (native) for unicode engine
% commands to output literal strings  (...)

\cs_new_protected:cpn { @@_string_from_unicode_utf8/string-raw:nN }  #1 #2
  {
     \str_set_convert:Nnnn #2
        { #1 }
        { default }
        {utf8/string}
  }

\cs_new_protected:cpn { @@_string_from_unicode_utf8/string:nN } #1 #2
  {
    \use:c { @@_string_from_unicode_utf8/string-raw:nN } { #1 } #2
    \str_put_left:Nn #2  {(}
    \str_put_right:Nn #2 {)}
  }
% special url command:
\cs_new_protected:cpx { @@_string_from_unicode_utf8/URI-raw:nN }  #1 #2
  {
     \exp_not:N \str_set_convert:Nnnn #2
       { #1 }
       { default }
       {utf8/url}
     \exp_not:N \str_replace_all:Nnn #2 {\c_percent_str 3A} {:}
     \exp_not:N \str_replace_all:Nnn #2 {\c_percent_str 2F} {/}
     \exp_not:N \str_replace_all:Nnn #2 {\c_percent_str 23} {\c_hash_str}
     \exp_not:N \str_replace_all:Nnn #2 {\c_percent_str 5B} {[}
     \exp_not:N \str_replace_all:Nnn #2 {\c_percent_str 5D} {]}
     \exp_not:N \str_replace_all:Nnn #2 {\c_percent_str 40} {\c_atsign_str}
     \exp_not:N \str_replace_all:Nnn #2 {\c_percent_str 21} {!}
     \exp_not:N \str_replace_all:Nnn #2 {\c_percent_str 24} {\c_dollar_str}
     \exp_not:N \str_replace_all:Nnn #2 {\c_percent_str 26} {\c_ampersand_str}
     \exp_not:N \str_replace_all:Nnn #2 {\c_percent_str 27} {'}
     \exp_not:N \str_replace_all:Nnn #2 {\c_percent_str 2A} {*}
     \exp_not:N \str_replace_all:Nnn #2 {\c_percent_str 2B} {+}
     \exp_not:N \str_replace_all:Nnn #2 {\c_percent_str 2C} {,}
     \exp_not:N \str_replace_all:Nnn #2 {\c_percent_str 3B} {;}
     \exp_not:N \str_replace_all:Nnn #2 {\c_percent_str 3D} {=}
     \exp_not:N \str_replace_all:Nnn #2 {\c_percent_str 3F} {?}
     \exp_not:N \str_replace_all:Nnn #2 {\c_percent_str 30} {0}
     \exp_not:N \str_replace_all:Nnn #2 {\c_percent_str 31} {1}
     \exp_not:N \str_replace_all:Nnn #2 {\c_percent_str 32} {2}
     \exp_not:N \str_replace_all:Nnn #2 {\c_percent_str 33} {3}
     \exp_not:N \str_replace_all:Nnn #2 {\c_percent_str 34} {4}
     \exp_not:N \str_replace_all:Nnn #2 {\c_percent_str 35} {5}
     \exp_not:N \str_replace_all:Nnn #2 {\c_percent_str 36} {6}
     \exp_not:N \str_replace_all:Nnn #2 {\c_percent_str 37} {7}
     \exp_not:N \str_replace_all:Nnn #2 {\c_percent_str 38} {8}
     \exp_not:N \str_replace_all:Nnn #2 {\c_percent_str 39} {9}
     \exp_not:N \str_replace_all:Nnn #2 {\c_percent_str 28} {\c_backslash_str(}
     \exp_not:N \str_replace_all:Nnn #2 {\c_percent_str 29} {\c_backslash_str)}
  }

\cs_new_protected:cpn { @@_string_from_unicode_utf8/URI:nN } #1 #2
  {
     \use:c { @@_string_from_unicode_utf8/URI-raw:nN } {#1} #2
     \str_put_left:Nn #2  {(}
     \str_put_right:Nn #2 {)}
  }
% with utf16 with BE marker
\cs_new_protected:cpn { @@_string_from_unicode_utf16/string-raw:nN }  #1 #2
  {
    \str_set_convert:Nnnn #2
      { #1 }
      { default }
      {utf16/string}
  }

\cs_new_protected:cpn { @@_string_from_unicode_utf16/string:nN } #1 #2
  {
    \use:c { @@_string_from_unicode_utf16/string-raw:nN } {#1} #2
    \str_put_left:Nn #2  {(}
    \str_put_right:Nn #2 {)}
  }

\cs_new_protected:cpn { @@_string_from_unicode_utf16/hex-raw:nN } #1 #2
  {
     \str_set_convert:Nnnn #2
       { #1 }
       { default }
       {utf16/hex}
  }

\cs_new_protected:cpn { @@_string_from_unicode_utf16/hex:nN } #1 #2
  {
    \use:c { @@_string_from_unicode_utf16/hex-raw:nN } {#1} #2
    \str_put_left:Nn #2  {<}
    \str_put_right:Nn #2 {>}
  }

%    \end{macrocode}
% \end{macro}
% \end{macro}
% \end{macro}
% \end{macro}
% \end{macro}
% \end{macro}
% \end{macro}
% \end{macro}
%
% \subsubsection{BDC  operator commands}
% \begin{macro}{\pdf_bdc:nn}
% \begin{macro}{\pdf_bdcobject:nn}
% \begin{macro}{\pdf_bdcobject:n}
% \begin{macro}{\pdf_bmc:n}
% \begin{macro}{\pdf_emc:}
%    \begin{macrocode}
\cs_new_protected:Npn  \pdf_bdc:nn #1 #2 { \@@_backend_bdc:nn { #1 }{ #2 } }
\cs_new_protected:Npn  \pdf_bdcobject:nn #1 #2 { \@@_backend_bdcobject:nn { #1 }{ #2 } }
\cs_new_protected:Npn  \pdf_bdcobject:n #1     { \@@_backend_bdcobject:n  { #1 } }
\cs_new_protected:Npn  \pdf_bmc:n #1     { \@@_backend_bmc:n  { #1 } }
\cs_new_protected:Npn  \pdf_emc:         { \@@_backend_emc: }
%    \end{macrocode}
% \end{macro}
% \end{macro}
% \end{macro}
% \end{macro}
% \end{macro}
%    \begin{macrocode}
%</package>
%    \end{macrocode}
%
% \end{implementation}
%
% \PrintIndex
