[latex3-commits] [git/LaTeX3-latex3-hyperref] cleanup-patches: use \@ifundefined (c743232)

[Ulrike Fischer]

Repository : https://github.com/latex3/hyperref
On branch  : cleanup-patches
Link       : https://github.com/latex3/hyperref/commit/c743232805f9c21c4125f0bcc6f5c44245bf29fa

>---------------------------------------------------------------

commit c743232805f9c21c4125f0bcc6f5c44245bf29fa
Author: Ulrike Fischer <fischer at troubleshooting-tex.de>
Date:   Mon Feb 21 17:11:50 2022 +0100

    use \@ifundefined


>---------------------------------------------------------------

c743232805f9c21c4125f0bcc6f5c44245bf29fa
 hyperref.dtx | 27 ++++++++++++---------------
 1 file changed, 12 insertions(+), 15 deletions(-)

diff --git a/hyperref.dtx b/hyperref.dtx
index 2aea661..81795a6 100644
--- a/hyperref.dtx
+++ b/hyperref.dtx
@@ -17901,8 +17901,8 @@
 }%
 \let\HyField at afields\ltx at empty
 \let\HyField at cofields\ltx at empty
-\begingroup\expandafter\expandafter\expandafter\endgroup
-\expandafter\ifx\csname pdflastlink\endcsname\relax
+\@ifundefined{pdflastlink}
+ {%
   \let\HyField at AddToFields\relax
   \PackageInfo{hyperref}{%
     You need pdfTeX 1.40.0 for setting the /Fields entry.%
@@ -17910,8 +17910,8 @@
     Adobe Reader/Acrobat accepts an empty /Field array,%
     \MessageBreak
     but other PDF viewers might complain%
-  }%
-\else
+  }}%
+ {%
   \let\HyField at AuxAddToFields\ltx at gobble
   \let\HyField at AuxAddToCoFields\ltx at gobbletwo
   \def\HyField at AfterAuxOpen{\Hy at AtBeginDocument}%
@@ -18006,7 +18006,7 @@
       \fi
     }%
   }%
-\fi
+ }
 \def\@Form[#1]{%
   \@ifundefined{textcolor}{\let\textcolor\@gobble}{}%
   \kvsetkeys{Form}{#1}%
@@ -18888,8 +18888,8 @@
 %
 %    \begin{macro}{\Hy at escapestring}
 %    \begin{macrocode}
-\begingroup\expandafter\expandafter\expandafter\endgroup
-\expandafter\ifx\csname pdf at escapestring\endcsname\relax
+\@ifundefined{pdf at escapestring}
+ {%
   \let\Hy at escapestring\@firstofone
   \def\Hy at escapeform#1{%
     \ifHy at pdfescapeform
@@ -18920,7 +18920,7 @@
       }%
     \fi
   }%
-\else
+ }{%
   \def\Hy at escapeform#1{%
     \ifHy at pdfescapeform
       \let\Hy at escapestring\pdfescapestring
@@ -18929,7 +18929,7 @@
     \fi
   }%
   \Hy at escapeform{}%
-\fi
+ }
 %    \end{macrocode}
 %    \end{macro}
 %
@@ -19885,12 +19885,9 @@
 %    \end{macrocode}
 %    \begin{macrocode}
 \let\H at old@part\@part
-\begingroup\expandafter\expandafter\expandafter\endgroup
-\expandafter\ifx\csname chapter\endcsname\relax
-  \let\Hy at secnum@part\z@
-\else
-  \let\Hy at secnum@part\m at ne
-\fi
+\@ifundefined{chapter}
+  {\let\Hy at secnum@part\z@}
+  {\let\Hy at secnum@part\m at ne}
 \def\@part{%
   \ifnum\Hy at secnum@part>\c at secnumdepth
     \phantomsection