longtable-每页的表行数不同-为什么?

longtable-每页的表行数不同-为什么?

通过以下示例,您将获得三页表格行。

第 1 页包含表格行 1 至表格行 41,即 41 个表格行。
第 2 页包含表格行 42 至表格行 83,即 42 个表格行。
第 3 页包含表格行 84 至表格行 100,即 17 个表格行。

为什么第 1 页和第 2 页包含的行数不一样?

如果按照此示例,通过取消注释该行将 longtable 起始页扩大到 1sp 这样小的量\enlargethispage{1sp},则第 1 页和第 2 页都包含 42 行。

\documentclass[letterpaper, landscape]{article}
\usepackage{geometry}
\usepackage{longtable}
\setcounter{LTchunksize}{2}

\newcount\scratchcnt
\newtoks\scratchtoks
\newcommand\PassFirstToSecond[2]{#2{#1}}
\newcommand\scratchloop[3]{%
  \begingroup
  \scratchcnt=#1\relax
  \scratchtoks{\endgroup}%
  \loop 
    \scratchtoks\expandafter{\the\expandafter\scratchtoks\romannumeral`\^^@#3}%
  \ifnum\scratchcnt<#2\relax
    \advance\scratchcnt by 1\relax
  \repeat
  \the\scratchtoks
}%

\pagestyle{plain}

\makeatletter
% \maxdepth\z@
\makeatother

\begin{document}

\newgeometry{margin=1.5cm}

%\enlargethispage{1sp}%

\begin{longtable}{|c|c|}
\hline number&text\\\hline\endhead
\hline\multicolumn{2}{|c|}{This is a clever remark.}\\\hline\endfoot
\scratchloop{1}%
            {100}%
            {\expandafter\hbox\expandafter{\expandafter\PassFirstToSecond\expandafter{\the\scratchcnt}{\hphantom{100}\llap}}%
            &text\\}%
\end{longtable}%

\restoregeometry

\end{document}

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编辑,2022 年 1 月 31 日:

思考这可能与第 149 行\maxdepth\z@有关longtable.sty—这是评论下“若脚非空,\vsize\@colroom相应减少。”

如果\maxdepth\z@注释掉第 149 行“ ”,则第 1 页和第 2 页都有 42 行。

如果\maxdepth\z@启用第 149 行“ ”,并且在序言中添加另一个\maxdepth\z@,则第 1 页和第 2 页都有 41 行。

\maxdepth当您跟踪排版表格某一行时所具有的值时,您会看到\maxdepth,在输出 longtable 的第一页时该值为 0,而5在输出该页面的后续页面时该值为:

\documentclass[letterpaper, landscape]{article}
\usepackage{geometry}
\usepackage{longtable}
\setcounter{LTchunksize}{2}

\newcount\scratchcnt
\newtoks\scratchtoks
\newcommand\PassFirstToSecond[2]{#2{#1}}
\newcommand\scratchloop[3]{%
  \begingroup
  \scratchcnt=#1\relax
  \scratchtoks{\endgroup}%
  \loop 
    \scratchtoks\expandafter{\the\expandafter\scratchtoks\romannumeral`\^^@#3}%
  \ifnum\scratchcnt<#2\relax
    \advance\scratchcnt by 1\relax
  \repeat
  \the\scratchtoks
}%

\pagestyle{plain}

\def\mymessagething#1{%
  \llap{#1}\message{^^JLine #1: Maxdepth: \the\maxdepth}%
}%

\makeatletter
%\maxdepth\z@
\makeatother

\begin{document}

\newgeometry{margin=1.5cm}

%\enlargethispage{1sp}%

\begin{longtable}{|c|c|}
\hline number&text\\\hline\endhead
\hline\multicolumn{2}{|c|}{This is a clever remark.}\\\hline\endfoot
\scratchloop{1}%
            {100}%
            {\expandafter
             \hbox\expandafter{%
               \expandafter\PassFirstToSecond\expandafter{\the\scratchcnt}{\hphantom{100}\mymessagething}%
             }%
            &text\\}%
\end{longtable}%

\restoregeometry

\end{document}

控制台输出:

$ pdflatex-dev test.tex
This is pdfTeX, Version 3.14159265-2.6-1.40.21 (TeX Live 2020) (preloaded format=pdflatex-dev)
 restricted \write18 enabled.
entering extended mode
(./test.tex
LaTeX2e <2021-05-01> pre-release-1 (develop 2021-2-27 branch)
L3 programming layer <2021-02-18>
(/usr/local/texlive/2020/texmf-dist/tex/latex-dev/base/article.cls
Document Class: article 2020/11/23 v1.4m Standard LaTeX document class
(/usr/local/texlive/2020/texmf-dist/tex/latex-dev/base/size10.clo))
(/usr/local/texlive/2020/texmf-dist/tex/latex/geometry/geometry.sty
(/usr/local/texlive/2020/texmf-dist/tex/latex-dev/graphics/keyval.sty)
(/usr/local/texlive/2020/texmf-dist/tex/generic/iftex/ifvtex.sty
(/usr/local/texlive/2020/texmf-dist/tex/generic/iftex/iftex.sty)))
(/usr/local/texlive/2020/texmf-dist/tex/latex-dev/tools/longtable.sty)
(/usr/local/texlive/2020/texmf-dist/tex/latex/l3backend/l3backend-pdftex.def)
(./test.aux)
*geometry* driver: auto-detecting
*geometry* detected driver: pdftex

Line 1: Maxdepth: 5.0pt 
Line 2: Maxdepth: 5.0pt 
Line 3: Maxdepth: 0.0pt 
Line 4: Maxdepth: 0.0pt 
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Line 46: Maxdepth: 0.0pt [1{/usr/local/texlive/2020/texmf-var/fonts/map/pdftex/
updmap/pdftex.map}] 
Line 47: Maxdepth: 5.0pt 
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Line 100: Maxdepth: 5.0pt [3] (./test.aux) )</usr/local/texlive/2020/texmf-dist
/fonts/type1/public/amsfonts/cm/cmr10.pfb>
Output written on test.pdf (3 pages, 19397 bytes).
Transcript written on test.log.

答案1

我想我找到了:

longtable 的输出例程,\LT@output第 384 行各自第 396 行longtable.sty\@makecol之前所做的\@outputpage

\@makecol反过来,在 LaTeX 2ε 核中定义——source2e.pdf,文件 V ltoutput.dtx,第 890 页,说道:

\@makecol:将 的内容\box255加上累积的脚注,加上 和 中的浮动元素,\@toplist合并\@botlist为高度为 的单列\@colht(除非页面高度已在本地更改),并将其放入框 中\@outputbox。它将 中的框放\@midlist回到\@freelist 并恢复\maxdepth

该文件的第 514 行表明恢复的分配\maxdepth是全局的。

因此,每当输出例程完成其工作时,\maxdepth都会全局“恢复”为当前存储在的值\@maxdepth

因此\LT@start设置\maxdepth\z@longtable.sty 第 149 行 如果表尾不为空,则只有在输出例程生成长表的第一页时才会起作用。后续页面\maxdepth返回\@maxdepth

在下面的例子中我修改了\LT@start也设置了\@maxdepth

但我怀疑这是否是最好的方法:

  • 这样\@maxdepth,一旦组成 longtable-environment 的组结束,该值就会被重置。
    但是修改的值\maxdepth(由 output-routine/\@makecol全局恢复)将一直有效,直到 longtable-environment 结束后下一次 output-routine 执行为止。
  • 我不知道为什么\maxdepth只有在表脚不为空的情况下才进行修改。
  • 我不知道修改如何影响嵌套的 longtable 环境。
  • 如果\maxdepth从本地值全局重置\@maxdepth\maxdepth则可能应该在长表环境的末尾从全局值全局重置\@maxdepth- 但前提是保存长表最后一部分的页面确实包含不属于长表的材料。
\documentclass[letterpaper, landscape]{article}
\usepackage{geometry}
\usepackage{longtable}
\setcounter{LTchunksize}{2}

\pagestyle{plain}

\makeatletter

\newcount\scratchcnt
\newtoks\scratchtoks
\newcommand\PassFirstToSecond[2]{#2{#1}}
\newcommand\scratchloop[3]{%
  \begingroup
  \scratchcnt=#1\relax
  \scratchtoks{\endgroup}%
  \loop 
    \scratchtoks\expandafter{\the\expandafter\scratchtoks\romannumeral`\^^@#3}%
  \ifnum\scratchcnt<#2\relax
    \advance\scratchcnt by 1\relax
  \repeat
  \the\scratchtoks
}%

\def\mymessagething#1{%
  \llap{#1}\immediate\write0{Line #1: \string\maxdepth: \the\maxdepth; \string\@maxdepth: \the\@maxdepth}%
}%

\def\LT@start{%                                                            %-line 114 of longtable.sty
  \let\LT@start\endgraf                                                    %-line 115 of longtable.sty
  \endgraf\penalty\z@\vskip\LTpre\endgraf                                  %-line 116 of longtable.sty
  \ifdim \pagetotal<\pagegoal \else                                        %-line 117 of longtable.sty
    \dimen@=\pageshrink                                                    %-line 118 of longtable.sty
   \advance \dimen@ 1sp %                                                  %-line 119 of longtable.sty
   \kern\dimen@\penalty 9999\endgraf \kern-\dimen@                         %-line 120 of longtable.sty
  \fi                                                                      %-line 121 of longtable.sty
  \dimen@\pagetotal                                                        %-line 122 of longtable.sty
  \advance\dimen@ \ht\ifvoid\LT@firsthead\LT@head\else\LT@firsthead\fi     %-line 123 of longtable.sty
  \advance\dimen@ \dp\ifvoid\LT@firsthead\LT@head\else\LT@firsthead\fi     %-line 124 of longtable.sty
  \advance\dimen@ \ht\LT@foot                                              %-line 125 of longtable.sty
  \edef\LT@reset@vfuzz{\vfuzz\the\vfuzz\vbadness\the\vbadness\relax}%      %-line 126 of longtable.sty
  \vfuzz\maxdimen                                                          %-line 127 of longtable.sty
  \vbadness\@M                                                             %-line 128 of longtable.sty
  \setbox\tw@\copy\z@                                                      %-line 129 of longtable.sty
  \setbox\tw@\vsplit\tw@ to \ht\@arstrutbox                                %-line 130 of longtable.sty
  \setbox\tw@\vbox{\unvbox\tw@}%                                           %-line 131 of longtable.sty
  \LT@reset@vfuzz                                                          %-line 132 of longtable.sty
  \advance\dimen@ \ht                                                      %-line 133 of longtable.sty
       \ifdim\ht\@arstrutbox>\ht\tw@\@arstrutbox\else\tw@\fi               %-line 134 of longtable.sty
  \advance\dimen@\dp                                                       %-line 135 of longtable.sty
       \ifdim\dp\@arstrutbox>\dp\tw@\@arstrutbox\else\tw@\fi               %-line 136 of longtable.sty
  \advance\dimen@ -\pagegoal                                               %-line 137 of longtable.sty
  \ifdim \dimen@>\z@                                                       %-line 138 of longtable.sty
    \vfil\break                                                            %-line 139 of longtable.sty
  \else                                                                    %-line 140 of longtable.sty
    \ifdim\pageshrink>\z@\pageshrink\z@\fi                                 %-line 141 of longtable.sty
  \fi                                                                      %-line 142 of longtable.sty
  \global\@colroom\@colht                                                  %-line 143 of longtable.sty
  \ifvoid\LT@foot\else                                                     %-line 144 of longtable.sty
 %   \advance\vsize-\ht\LT@foot                                            %-line 145 of longtable.sty
    \global\advance\vsize-\ht\LT@foot                                      %-line 146 of longtable.sty
    \global\advance\@colroom-\ht\LT@foot                                   %-line 147 of longtable.sty
    \dimen@\pagegoal\advance\dimen@-\ht\LT@foot\pagegoal\dimen@            %-line 148 of longtable.sty
    %%%%% Here:  %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%     % addition by me
    \@maxdepth\z@                                                          % addition by me
    \maxdepth\z@                                                           %-line 149 of longtable.sty
  \fi                                                                      %-line 150 of longtable.sty
  \ifvoid\LT@firsthead\copy\LT@head\else\box\LT@firsthead\fi\nobreak       %-line 151 of longtable.sty
  \output{\LT@output}}%                                                    %-line 152 of longtable.sty


\begin{document}

\newgeometry{margin=1.5cm}

\begin{longtable}{|c|c|}
\hline number&text\\\hline\endhead
\hline\multicolumn{2}{|c|}{This is a clever remark.}\\\hline\endfoot
\scratchloop{1}%
            {100}%
            {\expandafter
             \hbox\expandafter{%
              \expandafter\PassFirstToSecond\expandafter{\the\scratchcnt}{\hphantom{100}\mymessagething}%
             }%
            &text\\}%
\end{longtable}%

\message{^^JAfter longtable:}%

\message{^^J\string\maxdepth: \the\maxdepth; \string\@maxdepth: \the\@maxdepth}%

\newpage

\message{^^JAfter newpage:}

\message{^^J\string\maxdepth: \the\maxdepth; \string\@maxdepth: \the\@maxdepth}%

% \restoregeometry

\end{document}

经过此修改,第一页和第二页均包含 41 个表行。

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终端输出如下所示:

$ pdflatex-dev test.tex
This is pdfTeX, Version 3.14159265-2.6-1.40.21 (TeX Live 2020) (preloaded format=pdflatex-dev)
 restricted \write18 enabled.
entering extended mode
(./test.tex
LaTeX2e <2021-05-01> pre-release-1 (develop 2021-2-27 branch)
L3 programming layer <2021-02-18>
(/usr/local/texlive/2020/texmf-dist/tex/latex-dev/base/article.cls
Document Class: article 2020/11/23 v1.4m Standard LaTeX document class
(/usr/local/texlive/2020/texmf-dist/tex/latex-dev/base/size10.clo))
(/usr/local/texlive/2020/texmf-dist/tex/latex/geometry/geometry.sty
(/usr/local/texlive/2020/texmf-dist/tex/latex-dev/graphics/keyval.sty)
(/usr/local/texlive/2020/texmf-dist/tex/generic/iftex/ifvtex.sty
(/usr/local/texlive/2020/texmf-dist/tex/generic/iftex/iftex.sty)))
(/usr/local/texlive/2020/texmf-dist/tex/latex-dev/tools/longtable.sty)
(/usr/local/texlive/2020/texmf-dist/tex/latex/l3backend/l3backend-pdftex.def)
(./test.aux)
*geometry* driver: auto-detecting
*geometry* detected driver: pdftex
Line 1: \maxdepth: 5.0pt; \@maxdepth: 5.0pt
Line 2: \maxdepth: 5.0pt; \@maxdepth: 5.0pt
Line 3: \maxdepth: 0.0pt; \@maxdepth: 0.0pt
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[2]
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Line 98: \maxdepth: 0.0pt; \@maxdepth: 0.0pt
Line 99: \maxdepth: 0.0pt; \@maxdepth: 0.0pt
Line 100: \maxdepth: 0.0pt; \@maxdepth: 0.0pt

After longtable: 
\maxdepth: 0.0pt; \@maxdepth: 5.0pt [3] 
After newpage: 
\maxdepth: 5.0pt; \@maxdepth: 5.0pt (./test.aux) )</usr/local/texlive/2020/texm
f-dist/fonts/type1/public/amsfonts/cm/cmr10.pfb>
Output written on test.pdf (3 pages, 19391 bytes).
Transcript written on test.log.

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