[tex4ht-commits] [SCM] tex4ht updated: r1621 - trunk/lit

[Michal Hoftich]

Author: michal_h21
Date: 2025-01-08 11:21:23 +0000 (Wed, 08 Jan 2025)
New Revision: 1621

Modified:
   trunk/lit/ChangeLog
   trunk/lit/tex4ht-4ht.tex
Log:
fixed optional argument handling for aligned and alignedat environments

Modified: trunk/lit/ChangeLog
===================================================================
--- trunk/lit/ChangeLog	2025-01-05 21:36:18 UTC (rev 1620)
+++ trunk/lit/ChangeLog	2025-01-08 11:21:23 UTC (rev 1621)
@@ -1,3 +1,9 @@
+2025-01-08  Michal Hoftich  <michal.h21 at gmail.com>
+
+	* tex4ht-4ht.tex (amsmath.4ht): use LaTeX optional argument parsing
+	instead of \futurelet for handling of optional arguments in aligned
+	and alignedat environments. Thanks to Linas Stonys.
+
 2025-01-05  Michal Hoftich  <michal.h21 at gmail.com>
 
 	* tex4ht-mathml.tex (mathml.4ht): don't configure tilde accents in

Modified: trunk/lit/tex4ht-4ht.tex
===================================================================
--- trunk/lit/tex4ht-4ht.tex	2025-01-05 21:36:18 UTC (rev 1620)
+++ trunk/lit/tex4ht-4ht.tex	2025-01-08 11:21:23 UTC (rev 1621)
@@ -21918,9 +21918,8 @@
 \HLet\endaligned|=\:tempc
 \def\:temp{%
   \let\@testopt\alignsafe at testopt 
-  \futurelet\:temp\aligned:a}
-\def\aligned:a{\ifx [\:temp \expandafter\aligned:b
-   \else \def\:temp{\aligned:b[c]}\expandafter\:temp \fi}
+  \aligned:a}
+  \providecommand\aligned:a[1][c]{\aligned:b[#1]}
 \def\aligned:b[#1]{%   
    \al:gned{aligned}{#1}\m at ne}
 \HLet\aligned|=\:temp
@@ -21929,10 +21928,9 @@
 >>>
 
 \<equations of amsmath.sty\><<<
-\def\:temp{\futurelet\:temp\alignedat:a}
-\def\alignedat:a{\ifx [\:temp \expandafter\alignedat:b
-   \else \def\:temp{\alignedat:b[c]}\expandafter\:temp \fi}
-\def\alignedat:b[#1]{%
+\def\:temp{\alignedat:a}
+\providecommand\alignedat:a[1][c]{\alignedat:b[#1]}
+\def\alignedat:b[#1]#2{%
     \let\@testopt\alignsafe at testopt 
     \al:gned{alignedat}{#1}\m at ne}
 \HLet\alignedat|=\:temp