Re: XeTeX encoding problem

[Masamichi HOSODA]

> I hope it's clear what I'm trying to do here: instead of redefining,
> change the value of a conditional that is used within the macro. I
> thought that something similar might be possible with XeTeX's native
> Unicode.

Thank you for your advice.
I've made a patch.

ChangeLog:

Native Unicode replace switching instead of re-definition

2016-02-XX  Masamichi Hosoda  <truer...@trueroad.jp>

        * doc/texinfo.tex:
        Native Unicode replace switching instead of re-definition.

        (\ifpassthroughchars): New switch.
        (\DeclareUnicodeCharacterNative):
        Integrate \DeclareUnicodeCharacterNativeThru.
        Add capable to switch replace / pass-through characters.
        (\DeclareUnicodeCharacterNativeThru): Remove.
        (\nativeunicodechardefsthru): Remove.
        (\passthroughcharacters):
        Use switch instead of \nativeunicodechardefsthru.

--- texinfo.tex.org	2016-02-08 22:43:03.863678800 +0900
+++ texinfo.tex	2016-02-08 22:51:57.774630900 +0900
@@ -10816,15 +10816,32 @@
   \unicodechardefs
 }
 
+\newif\ifpassthroughchars
+\passthroughcharsfalse
+
 % For native Unicode (XeTeX and LuaTeX)
-% Definition macro to replace the Unicode character
+% Definition macro to replace / pass-through the Unicode character
 %
 \def\DeclareUnicodeCharacterNative#1#2{%
   \catcode"#1=\active
+  \def\dodeclareunicodecharacternative##1##2##3{%
+    \begingroup
+      \uccode`\~="##2\relax
+      \uppercase{\gdef~}{%
+        \ifpassthroughchars
+          ##1%
+        \else
+          ##3%
+        \fi
+      }
+    \endgroup
+  }
   \begingroup
-    \uccode`\~="#1\relax
-    \uppercase{\gdef~}{#2}%
-  \endgroup}
+    \uccode`\.="#1\relax
+    \uppercase{\def\UTFNativeTmp{.}}%
+    \expandafter\dodeclareunicodecharacternative\UTFNativeTmp{#1}{#2}%
+  \endgroup
+}
 
 % Native Unicode (XeTeX and LuaTeX) character replacing definitions
 % It makes the setting that replace the Unicode characters.
@@ -10833,27 +10850,6 @@
   \unicodechardefs
 }
 
-% For native Unicode (XeTeX and LuaTeX)
-% Definition macro not to make the Unicode character expand to a non-active 
-% token with the same character code.  Used when writing to auxiliary files.
-%
-\def\DeclareUnicodeCharacterNativeThru#1#2{%
-  \catcode"#1=\active
-  \begingroup
-    \uccode`\.="#1\relax
-    \uppercase{\endgroup \def\UTFNativeTmp{.}}%
-  \begingroup
-    \uccode`\~="#1\relax
-    \uppercase{\endgroup \edef~}{\UTFNativeTmp}%
-}
-
-% Native Unicode (XeTeX and LuaTeX) character ``through'' definitions.
-% It makes the setting that does not replace the Unicode characters.
-\def\nativeunicodechardefsthru{%
-  \let\DeclareUnicodeCharacter\DeclareUnicodeCharacterNativeThru
-  \unicodechardefs
-}
-
 % For native Unicode (XeTeX and LuaTeX).  Make the character token expand
 % to the sequences given in \unicodechardefs for printing.
 \def\DeclareUnicodeCharacterNativeAtU#1#2{%
@@ -10941,7 +10937,7 @@
   \iftxiusebytewiseio
     \nonasciistringdefs
   \else
-    \nativeunicodechardefsthru
+    \passthroughcharstrue
   \fi
 }