can someone please tell what I'm doing wrong here?
\newcommand{\bc}{\small\begin{verbatim}}
\newcommand{\ec}{\normalsize\end{verbatim}}
and then
\bc
1 3 6 7 89 10
22 7 7 45
\ec
but I get
Runaway argument?
^^M1 3 6 7 89 10^^M 22 7 7 45^^M\ec^^M^^M\section{Reading on\ETC.
! File ended while scanning use of \@xverbatim.
<inserted text>
\par
<*> i4c.tex
?
! Emergency stop.
<inserted text>
\par
<*> i4c.tex
I thought it was pretty safe to do that, since most commands are just text substitutions... any hints?
How \\begin{verbatim}
works. briefly and roughly.
\\begin{verbatim}
is expanded to \\verbatim
. \\verbatim
sets category code of each special characters to 12. Now all chars is like digits or puncts. \\verbatim
sets font, parindent and calls \\@xverbatim
. \\@xverbatim
catches the end of verbatim using the following trick:
\\def\\@xverbatim#1\\end{#1\\end}
Then \\end{verbatim} finishes work.
How newcommand{\\bc}{\\small\\begin{verbatim}}
works.
\\bс
expands to \\small\\begin{verbatim}
. \\begin{verbatim}
expands to \\varbatim
. \\varbatim
changes all categories and font. \\verbatim
calls \\@xverbatim
. \\@xverbatim
tries to catch your argument using the following trick:
\\def\\@xverbatim#1\\end{#1\\end}
but it is impossible because of \\@xverbatim
tries to catch \\end
where all letters ( \\
, e
, n
, d
) have the category 12 and 11. But in fact there are only \\ec
exsits.
\\@xverbatim
is trying and trying to find \\end
where backslash ( \\
) has category 12 but.... File ended while scanning use of \\@xverbatim
verbatim
是特殊的,它扫描文字 \\end{verbatim}
,因为在\\begin{verbatim}
之后没有执行任何宏替换。
Some environment, such as verbatim
, need to scan in the text ahead to find their end manually. So unlike “normal” environments, verbatim
needs to find the text \\end{verbatim}
in the input text, verbatim.
In your example, it doesn't (since the input text contains \\ec
instead.
As a workaround, you can instead use the fancyvrb
package that defines a Verbatim
package and allows definition custom verbatim environments.
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