Jairo A. del Rio schrieb am 14.07.2020 um 02:08:
Hi list!
In evenmore pp. 76-77, concerning LMTX extended macro parsing, the
following examples of #0, #+ and #- are given
\def\TestA#1#2#3{{(#1)(#2)(#3)}}
\def\TestB#1#0#3{(#1)(#2)(#3)}
\def\TestC#1#+#3{(#1)(#2)(#3)}
\def\TestD#1#-#2{(#1)(#2)}
So
\TestA1{\red 2}3
\TestB1{\red 2}3
\TestC1{\red 2}3
\TestD1{\red 2}3
give
(1)(2)(3) % red from "2" onward
(1)()(3)
(1)(2)(3) % only "2" is colored
(1)(3)
What I guess is that #+ pass an argument, grouping braces included (the
report says an argument is passed "as-is"). I see it as really useful.
But, apart from the example above, are there any other differences
between doing, say, \def\foo#1#2#3 and \def\foo#+#+#+{#1#2#3}? Thank you
very much.
It's usefull when you use optional arguments because TeX removes the
braces around the content of the argument.
\starttext
\def\testa[#1]{\detokenize{#1}}
\def\testb[#+]{\detokenize{#1}}
\testa[{braces}]
\testb[{braces}]
\stoptext
Wolfgang
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