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有没有办法将信息存储在类似数组的东西中

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有没有办法将信息存储在类似数组的东西中

我想将一些有关人员的基本信息存储在一个文件中，并希望 LaTeX 能够处理这些信息。更具体地说，我想存储以下内容：

id:john1; fname: John; lname: Doe; mail: [email protected]
id:harry1; fname: Harry; lname: Potter; mail: [email protected]

等等。这在 LaTeX 中可行吗，即是否有办法 1) 制作此列表并 2) 通过类似 \data{john1}{fname} 的方式将这些信息放在文档中？

答案1

您可以通过原语读取文件\read。数据存储在控制序列中\base:id:name。\data宏只是扩展了这个控制序列。

\newread\basein
\def\readbase #1 {\bgroup \endlinechar=-1 \openin\basein=#1 \readbaseA}
\def\readbaseA{\ifeof\basein \egroup \else
   \read\basein to\tmp
   \ifx\tmp\empty \else \expandafter\base\tmp; :.; \fi
   \expandafter\readbaseA \fi
}
\def\base id:#1; {\def\baseid{#1}\baseA}
\def\baseA #1:#2#3; {\ifx\end#1\end\else
   \expandafter\gdef\csname base:\baseid:#1\endcsname{#2#3}%
   \expandafter\baseA\fi
}
\def\data#1#2{\csname base:#1:#2\endcsname}

\readbase base.txt  % reading the file

\data{john1}{fname}

答案2

一个独立的实现：

\documentclass{article}
\usepackage{xparse}

\ExplSyntaxOn

\NewDocumentCommand{\storedata}{mm}
 {% pass control to an inner function
  \konewka_store_data:nn { #1 } { #2 }
 }

\DeclareExpandableDocumentCommand{\getdata}{mm}
 {% just retrieve the property from the appropriate property list
  \prop_item:cn { g_konewka_data_#1_prop } { #2 }
 }

\seq_new:N \l__konewka_data_temp_seq
\seq_new:N \l__konewka_field_temp_seq

\cs_new_protected:Nn \konewka_store_data:nn
 {
  % create a property list for an ID
  \prop_new:c { g_konewka_data_#1_prop }
  % split the second argument
  \seq_set_split:Nnn \l__konewka_data_temp_seq { ; } { #2 }
  % process each field
  \seq_map_inline:Nn \l__konewka_data_temp_seq
   {
    \__konewka_process_field:nn { #1 } { ##1 }
   }
 }

% we need a colon with the appropriate category code    
\group_begin:
\char_set_lccode:nn { `? } { `: }
\tl_to_lowercase:n
 {
  \group_end:
  \tl_const:Nn \c_konewka_colon_tl { ? }
 } 

% split the field at the colon and store the property    
\cs_new_protected:Nn \__konewka_process_field:nn
 {
  \seq_set_split:NVn \l__konewka_data_field_seq \c_konewka_colon_tl { #2 }
  \prop_gput:cxx { g_konewka_data_#1_prop }
   { \seq_item:Nn \l__konewka_data_field_seq { 1 } }
   { \seq_item:Nn \l__konewka_data_field_seq { 2 } }
 }
\cs_generate_variant:Nn \seq_set_split:Nnn { NV }
\cs_generate_variant:Nn \prop_gput:Nnn { cxx }

\ExplSyntaxOff

\storedata{john1}{fname: John; lname: Doe; mail: [email protected]}
\storedata{harry1}{fname: Harry; lname: Potter; mail: [email protected]}

\begin{document}

\begin{tabular}{cccc}
Id & fname & lname & mail \\
\hline
\texttt{john1} & \getdata{john1}{fname} & \getdata{john1}{lname} & \getdata{john1}{mail} \\
\texttt{harry1} & \getdata{harry1}{fname} & \getdata{harry1}{lname} & \getdata{harry1}{mail} \\
\end{tabular}

\end{document}

在此处输入图片描述

还允许从文件读取数据的版本。此处文件添加有filecontents，但可以是任意格式，只要格式如图所示。冒号和分号周围的空格将被忽略。

\begin{filecontents*}{\jobname.csv}
id:john1; fname: John; lname: Doe; mail: [email protected]
id:harry1; fname: Harry; lname: Potter; mail: [email protected]
\end{filecontents*}

\documentclass{article}
\usepackage{xparse}

\ExplSyntaxOn

\NewDocumentCommand{\storedata}{mm}
 {% pass control to an inner function
  \konewka_add_id:n { #1 }
  \konewka_store_data:nn { #1 } { #2 }
 }

\NewDocumentCommand{\readdata}{m}
 {
  \konewka_read_data:n { #1 }
 }

\DeclareExpandableDocumentCommand{\getdata}{mm}
 {% just retrieve the property from the appropriate property list
  \prop_item:cn { g_konewka_data_#1_prop } { #2 }
 }

\NewDocumentCommand{\listIDs}{}
 {% just an example
  \seq_use:Nn \g_konewka_id_seq { ,~ }
 }

%%% variables

% we need a colon with the appropriate category code    
\tl_const:Nx \c_konewka_colon_tl { \tl_to_str:n {:} }
% other variables
\seq_new:N \g_konewka_id_seq

\tl_new:N \l__konewka_id_tl
\seq_new:N \l__konewka_data_temp_seq
\seq_new:N \l__konewka_field_temp_seq
\ior_new:N \g__konewka_read_data_stream

%%% variants of kernel functions
\cs_generate_variant:Nn \seq_set_split:Nnn { NV , NVV }
\cs_generate_variant:Nn \prop_gput:Nnn { cxx }

%%% our functions

% add the new id to a sequence for possible later usage
\cs_new_protected:Nn \konewka_add_id:n
 {
  \seq_gput_right:Nn \g_konewka_id_seq { #1 }
 }
\cs_generate_variant:Nn \konewka_add_id:n { V }

% the inner function for \storedata
\cs_new_protected:Nn \konewka_store_data:nn
 {
  % create a property list for an ID
  \prop_new:c { g_konewka_data_#1_prop }
  % split the second argument at semicolons
  \seq_set_split:Nnn \l__konewka_data_temp_seq { ; } { #2 }
  % populate the property list
  \__konewka_process_entry:n { #1 }
 }

% the inner function for \readdata
\cs_new_protected:Nn \konewka_read_data:n
 {
  \ior_open:Nn \g__konewka_read_data_stream { #1 }
  \ior_map_inline:Nn \g__konewka_read_data_stream
   {
    % split a line into fields
    \seq_set_split:Nnn \l__konewka_data_temp_seq { ; } { ##1 }
    % retrieve the first field (ID)
    \seq_pop_left:NN \l__konewka_data_temp_seq \l__konewka_id_tl
    % split at colon and set the ID to the second part
    \seq_set_split:NVV \l__konewka_data_field_seq \c_konewka_colon_tl \l__konewka_id_tl
    \tl_set:Nx \l__konewka_id_tl { \seq_item:Nn \l__konewka_data_field_seq { 2 } }
    % add the id to the list
    \konewka_add_id:V \l__konewka_id_tl
    % populate the property list
    \__konewka_process_entry:V \l__konewka_id_tl
   }
 }

% auxiliary function
\cs_new_protected:Nn \__konewka_process_entry:n
 {
  \seq_map_inline:Nn \l__konewka_data_temp_seq
   {
    \seq_set_split:NVn \l__konewka_data_field_seq \c_konewka_colon_tl { ##1 }
    \prop_gput:cxx { g_konewka_data_#1_prop }
     { \seq_item:Nn \l__konewka_data_field_seq { 1 } }
     { \seq_item:Nn \l__konewka_data_field_seq { 2 } }
   }
 }
\cs_generate_variant:Nn \__konewka_process_entry:n { V }

\ExplSyntaxOff

\readdata{\jobname.csv}
\storedata{uthor1}{fname: Algernon; lname: Uthor; mail: [email protected]}
\storedata{riter1}{fname: Walter; lname: Riter; mail: [email protected]}

\begin{document}

\begin{tabular}{cccc}
Id & fname & lname & mail \\
\hline
\texttt{john1} & \getdata{john1}{fname} & \getdata{john1}{lname} & \getdata{john1}{mail} \\
\texttt{harry1} & \getdata{harry1}{fname} & \getdata{harry1}{lname} & \getdata{harry1}{mail} \\
\texttt{uthor1} & \getdata{uthor1}{fname} & \getdata{uthor1}{lname} & \getdata{uthor1}{mail} \\
\texttt{riter1} & \getdata{riter1}{fname} & \getdata{riter1}{lname} & \getdata{riter1}{mail} \\
\end{tabular}

\medskip

The IDs are: \listIDs

\end{document}

在此处输入图片描述

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