我用過一個例子
透過添加新的\newcommand，如下面的程式碼所示：
\documentclass{article}
\usepackage{etoolbox}
\newcounter{cnt}
\newcommand\textlist{}
\newcommand\settext[2]{%
\csdef{text#1}{#2}}
\newcommand\addtext[1]{%
\stepcounter{cnt}%
\csdef{text\thecnt}{#1}}
\newcommand\gettext[1]{%
\csuse{text#1}}
\newcounter{newcnt}
\newcommand\newtextlist{}
\newcommand\setnewtext[2]{%
\csdef{text#1}{#2}}
\newcommand\addnewtext[1]{%
\stepcounter{newcnt}%
\csdef{text\thenewcnt}{#1}}
\newcommand\getnewtext[1]{%
\csuse{text#1}}
\begin{document}
\addtext{one}
\addtext{two}
\addtext{three}
\settext{100}{one hundred}
This is text \gettext{1} and \gettext{3}, that is text \gettext{2}.
100 is \gettext{100}.\\
Add new info into newtext.
\addnewtext{four}
\addnewtext{five}
\addnewtext{six}
\setnewtext{100}{seven hundred}
This is newtext \getnewtext{1} and \getnewtext{3}, that is newtext \getnewtext{2}.
100 is \getnewtext{100}.\\
This is text \gettext{1} and \gettext{3}, that is text \gettext{2}.
100 is \gettext{100}.\\
\end{document}
的第一次呼叫gettext將給出正確答案：一二三。但第二個gettext將得到與以下相同的數據getnewtext上面相同的數據：四、五、六。
我怎樣才能恢復到以前的樣子一二三？謝謝。
答案1
您可以根據需要維護任意數量的數組（實際上是屬性列表），並使用與expl3.
\documentclass{article}
\usepackage{xparse}
\ExplSyntaxOn
% 1. The user interface
% 1a. \additem[<name>]{<text>}
\NewDocumentCommand{\additem}{ O{default} m }
{
\ramiza_array_add:nnn { #1 } { } { #2 }
}
% 1b. \setitem[<name>]{<slot>}{<text>}
\NewDocumentCommand{\setitem}{ O{default} m m }
{
\ramiza_array_add:nnn { #1 } { #2 } { #3 }
}
% 1c. \getitem[<name>]{<slot>}
\DeclareExpandableDocumentCommand{\getitem}{ O{default} m }
{
\ramiza_array_get:nn { #1 } { #2 }
}
% 2. The internal functions
\cs_new_protected:Nn \ramiza_array_add:nnn
{% if the array doesn't exist yet, allocate it with its related counter
\prop_if_exist:cF { g_ramiza_array_#1_prop }
{
\prop_new:c { g_ramiza_array_#1_prop }
\int_new:c { g_ramiza_array_#1_int }
}
\tl_if_empty:nTF { #2 }
{% with \additem we step the counter and set the next slot
\int_gincr:c { g_ramiza_array_#1_int }
\prop_gput:cvn { g_ramiza_array_#1_prop } { g_ramiza_array_#1_int } { #3 }
}
{% with \setitem we set the requested slot
\prop_gput:cnn { g_ramiza_array_#1_prop } { #2 } { #3 }
}
}
\cs_generate_variant:Nn \prop_gput:Nnn { cv }
\cs_new:Nn \ramiza_array_get:nn
{% retrieve the requested item
\prop_item:cn { g_ramiza_array_#1_prop } { #2 }
}
\ExplSyntaxOff
\begin{document}
\additem{one}
\additem{two}
\additem{three}
\setitem{100}{one hundred}
This is text \getitem{1} and \getitem{3}, that is text \getitem{2}. 100 is \getitem{100}.
Add new info into newtext.
\additem[new]{four}
\additem[new]{five}
\additem[new]{six}
\setitem[new]{100}{seven hundred}
This is newtext \getitem[new]{1} and \getitem[new]{3}, that is newtext \getitem[new]{2}.
100 is \getitem[new]{100}.
This is text \getitem{1} and \getitem{3}, that is text \getitem{2}. 100 is \getitem{100}.
\end{document}
有一個“預設”數組，您無需使用\additem,\setitem或\getitem;的可選參數即可存取該數組。一旦您使用\additemor的可選參數\setitem，就會指派一個新數組，以便與 一起使用\getitem。
答案2
在第二個列表中使用newtext#1etc.而不是etc.。text#1這些是定義巨集名稱。您希望它們是唯一的，否則您將覆蓋舊的定義。
哦，不要在普通上下文（外部等）中使用\\換行符。tabulararray
\documentclass{article}
\usepackage{etoolbox}
\newcounter{cnt}
\newcommand\textlist{}
\newcommand\settext[2]{%
\csdef{text#1}{#2}}
\newcommand\addtext[1]{%
\stepcounter{cnt}%
\csdef{text\thecnt}{#1}}
\newcommand\gettext[1]{%
\csuse{text#1}}
\newcounter{newcnt}
\newcommand\newtextlist{}
\newcommand\setnewtext[2]{%
\csdef{newtext#1}{#2}}
\newcommand\addnewtext[1]{%
\stepcounter{newcnt}%
\csdef{newtext\thenewcnt}{#1}}
\newcommand\getnewtext[1]{%
\csuse{newtext#1}}
\begin{document}
\addtext{one}
\addtext{two}
\addtext{three}
\settext{100}{one hundred}
This is text \gettext{1} and \gettext{3}, that is text \gettext{2}.
100 is \gettext{100}.
Add new info into newtext.
\addnewtext{four}
\addnewtext{five}
\addnewtext{six}
\setnewtext{100}{seven hundred}
This is newtext \getnewtext{1} and \getnewtext{3}, that is newtext \getnewtext{2}.
100 is \getnewtext{100}.
This is text \gettext{1} and \gettext{3}, that is text \gettext{2}.
100 is \gettext{100}.
\end{document}