1 files changed, 66 insertions, 3 deletions
diff --git a/Master/texmf-dist/tex/generic/texapi/texapi.tex b/Master/texmf-dist/tex/generic/texapi/texapi.tex
index 28f33717fb3..0312d1aeb42 100644
--- a/Master/texmf-dist/tex/generic/texapi/texapi.tex
+++ b/Master/texmf-dist/tex/generic/texapi/texapi.tex
@@ -4,7 +4,7 @@
 % Author: Paul Isambert.
 % E-mail: zappathustra AT free DOT fr
 % Comments and suggestions are welcome.
-% Date: January 2011.
+% Date: October 2011.
 %
 \ifx\texapialreadyloaded\somethingtotallyundefined
 \else
@@ -16,7 +16,7 @@
   \expandafter\endinput
 \fi
 %
-\def\texapiversion{1.03}
+\def\texapiversion{1.04}
 \expandafter\edef\csname pi@restorecatcodes\endcsname{%
   \catcode`\noexpand\@=\the\catcode`@\relax
   \catcode`\noexpand\_=\the\catcode`_\relax
@@ -222,7 +222,7 @@
 \def\reverse#1{%
   \ifcs{pi@reverse_\commandtoname#1}
     {\usecs{pi@reverse_\commandtoname#1}}
-    {\senderror{texapi}{You can't use `\string\reverse' before `\string#1'}#1}%
+    {\unless#1}%
   }
 %
 \def\pi@ifdef_simple#1#2{%
@@ -354,6 +354,67 @@
   \fi
   }
 %
+\pi@ifdef_onearg\ifwhatever{%
+  #1%
+    \ifx\pi@ifwhatever_false aa%
+      \pi@ifwhatever_true
+    \else
+      \expandafter\expandafter\expandafter\firstoftwo
+    \fi
+  \else
+    \expandafter\secondoftwo
+  \fi
+  }
+\def\pi@ifwhatever_false#1\fi#2\fi{\secondoftwo}
+\def\pi@ifwhatever_true#1\fi#2\fi{\fi\firstoftwo}
+%
+\pi@ifdef_onearg\ifexpression{%
+  \pi@ifexpression_or#1|\pi@terminator
+  }
+\def\pi@ifexpression_or#1|#2\pi@terminator{%
+  \ifemptystring{#2}
+    {\pi@ifexpression_and#1&\pi@terminator}
+    {\ifexpression{#1}{\firstoftwo}{\pi@ifexpression_removeor#2\pi@terminator}}%
+  }
+\def\pi@ifexpression_and#1&#2\pi@terminator{%
+  \ifemptystring{#2}
+    {\passtrimleft{#1}\pi@ifexpression_not}
+    {\ifexpression{#1}{\pi@ifexpression_removeand#2\pi@terminator}{\secondoftwo}}%
+  }
+\def\pi@ifexpression_removeor#1|\pi@terminator{%
+  \pi@ifexpression_or#1|\pi@terminator
+  }
+\def\pi@ifexpression_removeand#1&\pi@terminator{%
+  \pi@ifexpression_or#1|\pi@terminator
+  }
+\def\pi@ifexpression_not#1{%
+  \ifprefix-{#1}% See line 858, where \newstring{-} is declared, so this remains expandable.
+    {\expandafter\pi@ifexpression_braces\gobbleone#1{}\pi@terminator
+       % Trimming will also remove braces.
+       {\expandafter\passtrimright\expandafter{\gobbleone#1}\ifexpression}
+       {\expandafter\ifwhatever\expandafter{\gobbleone#1}}
+       \secondoftwo\firstoftwo}
+    {\pi@ifexpression_braces#1{}\pi@terminator
+       {\passtrimright{#1}\ifexpression}
+       {\ifwhatever{#1}}}%
+  }
+\def\pi@ifexpression_braces#1#{%
+  \pi@gobbletoterminator{%
+    \ifemptystring{#1}}
+  }
+%
+\long\def\ifelseif#1{%
+  \pi@ifelseif{}#1\iftrue{}\pi@terminator
+  }
+\long\def\pi@reverse_ifelseif#1{%
+  \pi@ifelseif\reverse#1\iffalse{}\pi@terminator
+  }
+\long\def\pi@ifelseif#1#2#3{%
+  #1\ifwhatever{#2}
+     {\pi@gobbletoterminator{#3}}
+     {\pi@ifelseif{#1}}%
+  }
+%
 %
 %
 %
@@ -795,6 +856,8 @@
     ##3{##1}{##2}}%
   }
 %
+\newstring{-}% This is for \ifprefix on line 391 above.
+%
 \pi@ifdef_twoarg\ifprefix{%
   \ifemptystring{#1}\firstoftwo
                     {\ifcs{pi@strings_ifprefix:\detokenize{#1}}