Hi,
inspired by [a recent TeX.sx question][1] this allows delimited macros
with `#` in the parameter text by doubling the `#`.
It isn't needed that often but it is useful if you try to analyze the
parameter text of a TeX macro using TeX code. Also it is completely
backward-compatible (`##` always triggers an error without this) and
it is very easy to implement.
For example:
\def\test#1###2{(#1)[#2]}
\test hello#{world}
would result in (hello)[world]
Best regards,
Marcel Krüger
1:
https://tex.stackexchange.com/questions/491296/can-i-have-a-delimited-macro-with-a-literal-in-the-parameter-text
---
source/texk/web2c/luatexdir/tex/scanning.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/source/texk/web2c/luatexdir/tex/scanning.c
b/source/texk/web2c/luatexdir/tex/scanning.c
index 8f7e1d591..e8b9fca66 100644
--- a/source/texk/web2c/luatexdir/tex/scanning.c
+++ b/source/texk/web2c/luatexdir/tex/scanning.c
@@ -2095,7 +2095,8 @@ halfword scan_toks(boolean macro_def, boolean xpand)
store_new_token(end_match_token);
goto DONE;
}
- if (t == nine_token) {
+ if (cur_cmd == mac_param_cmd) {
+ } else if (t == nine_token) {
print_err("You already have nine parameters");
help1("I'm going to ignore the # sign you just used.");
error();
--
2.21.0
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