檢查定義未知 \pgfkeys

Question

我想使用genealogytree套件創建一個大型家譜樹，並決定​​將人員資料儲存在單獨的檔案中測試資料庫.tex（MWE 包含三個人）。從主文件中test.tex，我建立了一種新格式genealogytree：xTestFormat使用「test_database.tex」中填入的鍵。

我閱讀了 pgf 手冊部分，\pgfkeys並且了解如何在一般使用之前檢查金鑰是否存在，但在我的情況下則不然。來自 MWE：由於我事先不知道資料庫包含“Tom Water”數據，因此我不知道如何檢查comment“Tom Walter”的金鑰是否存在。因此，當我嘗試使用該密鑰時，我收到錯誤訊息：Undefined control sequence. }。

當我們事先不知道 pgfkey 的名稱時，如何檢查它是否不為空？

微量元素

（取消註解倒數第三行測試資料庫.tex以便編譯文件 ( comment = {There is nothing to say})。

測試文件

\documentclass{standalone}

\usepackage[all]{genealogytree}

\begin{document}
    
    % Define new keys in genealogytree database
    \pgfkeys{/gtr/database/.cd,
        nationality/.store in=\nationality,
        given name/.store in=\givenname,
        family name/.store in=\familyname
    }
    
    % Define new command with information to print
    \newcommand\PrintPeople[1]{
        \gtrPrintSex~\givenname
    
        \familyname
        
        \gtrPrintComment
    }
    
    % Define new format for genealogytree
    \gtrDeclareDatabaseFormat{xTestFormat}
    {% Define tcolorbox parameters based on 'nationality' key
        \tcbset{french/.style={colback=blue!5!white,colframe=blue}}
        \tcbset{british/.style={colback=red!5!white,colframe=red}}      
    }
    {\PrintPeople}
    
    \input{test_database}
    
    \begin{tikzpicture}
        
        \genealogytree[
            timeflow=down,
            processing=database,
            database format=xTestFormat,
            box={\nationality}
        ]
        {child[id=fam_Water]{
            p[id=Justine]{persdata=JustineID}
            g[id=Tom]{persdata=TomID}
            c[id=Jane]{persdata=JaneID}
            }
        }
        
    \end{tikzpicture}
\end{document}

測試資料庫.tex

% Create database

% Jane Water
\pgfkeys{/gtr/database/.cd,
    persdata/.is choice,
    persdata/JaneID/.style={
        female,
        nationality = british,
        given name  = Jane,
        family name = Water,
        comment     = {Something else}
    }
}

% Justine Random
\pgfkeys{/gtr/database/.cd,
    persdata/.is choice,
    persdata/JustineID/.style={
        female,
        nationality = french,
        given name  = Justine,
        family name = Random,
        comment     = {Something interesting}
    }
}

% Tom Water
\pgfkeys{/gtr/database/.cd,
    persdata/.is choice,
    persdata/TomID/.style={
        male,
        nationality = british,
        given name  = Tom,
        family name = Water,
%       comment     = {There is nothing to say}
    }
}

Answer 1

由於錯誤是Undefined control sequence. \gtrDBcomment您可以透過測試是否\gtrDBcomment定義來測試該資料庫條目是否存在，例如，使用\ifdefined.

如果您不知道，當 TeX 遇到未定義的控制序列時，它會拋出錯誤並顯示一行上下文，在該行中，未定義的控制序列將是最後一個。在你的例子中，TeX 顯示：

Undefined control sequence.
\gtrPrintComment ... {0pt}{\itshape \gtrDBcomment
                                                  }

第一行的最後一個控制序列是\gtrDBcomment，這確實是 TeX 試圖擴展的控制序列，儘管它沒有定義。

因此，如果您更改 的定義來\PrintPeople測試該巨集是否已定義，應該會很好：

\newcommand\PrintPeople[1]{
    \gtrPrintSex~\givenname

    \familyname
    
    \ifdefined\gtrDBcomment
      \gtrPrintComment
    \fi
}

完整的 MWE：

\documentclass{standalone}

\usepackage[all]{genealogytree}

\begin{document}

% Define new keys in genealogytree database
\pgfkeys{/gtr/database/.cd,
    nationality/.store in=\nationality,
    given name/.store in=\givenname,
    family name/.store in=\familyname
}

% Define new command with information to print
\newcommand\PrintPeople[1]{
    \gtrPrintSex~\givenname

    \familyname
    
    \ifdefined\gtrDBcomment
      \gtrPrintComment
    \fi
}

% Define new format for genealogytree
\gtrDeclareDatabaseFormat{xTestFormat}
{% Define tcolorbox parameters based on 'nationality' key
    \tcbset{french/.style={colback=blue!5!white,colframe=blue}}
    \tcbset{british/.style={colback=red!5!white,colframe=red}}      
}
{\PrintPeople}

% Contents of the database
% Jane Water
\pgfkeys{/gtr/database/.cd,
    persdata/.is choice,
    persdata/JaneID/.style={
        female,
        nationality = british,
        given name  = Jane,
        family name = Water,
        comment     = {Something else}
    }
}
% Justine Random
\pgfkeys{/gtr/database/.cd,
    persdata/.is choice,
    persdata/JustineID/.style={
        female,
        nationality = french,
        given name  = Justine,
        family name = Random,
        comment     = {Something interesting}
    }
}
% Tom Water
\pgfkeys{/gtr/database/.cd,
    persdata/.is choice,
    persdata/TomID/.style={
        male,
        nationality = british,
        given name  = Tom,
        family name = Water,
%       comment     = {There is nothing to say}
    }
}
% End of database

\begin{tikzpicture}
    
    \genealogytree[
        timeflow=down,
        processing=database,
        database format=xTestFormat,
        box={\nationality}
    ]
    {child[id=fam_Water]{
        p[id=Justine]{persdata=JustineID}
        g[id=Tom]{persdata=TomID}
        c[id=Jane]{persdata=JaneID}
        }
    }
    
\end{tikzpicture}
\end{document}