☰

ConTeXt：用模式定义特定行为

tag-icon • tag-icon conditionals context
ConTeXt：用模式定义特定行为

我正在尝试定义自己的开始/停止块，用于带有某些格式的条件编译。我尝试使用模式并添加边距规则（如果要显示该块）。

但是，只有启用该模式时，它才能正确编译。如果禁用该模式，则编译不起作用。这是我的 MWE：

\definemode[teacherversion][yes]
\definestartstop[teacheronly]
                [before={\startmode[teacherversion]\startmarginrule},
                after={\stopmarginrule\stopmode}]
\disablemode[teacherversion]
\starttext
Text before

\startteacheronly
  \input knuth
\stopteacheronly

Text after
\stoptext

以及 context 的输出：

adrien@arsenalGear:~/dev/testConteXt$ context blocktest.tex

mtx-context     | run 1: luatex --fmt="/opt/context/tex/texmf-cache/luatex-cache/context/5fe67e0bfe781ce0dde776fb1556f32e/formats/luatex/cont-en" --jobname="blocktest" --lua="/opt/context/tex/texmf-cache/luatex-cache/context/5fe67e0bfe781ce0dde776fb1556f32e/formats/luatex/cont-en.lui" --no-parse-first-line --c:currentrun=1 --c:fulljobname="./blocktest.tex" --c:input="./blocktest.tex" --c:kindofrun=1 --c:maxnofruns=9 "cont-yes.mkiv"
This is LuaTeX, Version 0.95.0 (TeX Live 2016) 
 system commands enabled.
open source     > 1 > 1 > /opt/context/tex/texmf-context/tex/context/base/mkiv/cont-yes.mkiv

ConTeXt  ver: 2016.07.08 17:19 MKIV beta  fmt: 2016.7.9  int: english/english

system          > 'cont-new.mkiv' loaded
open source     > 2 > 2 > /opt/context/tex/texmf-context/tex/context/base/mkiv/cont-new.mkiv
close source    > 2 > 2 > /opt/context/tex/texmf-context/tex/context/base/mkiv/cont-new.mkiv
system          > files > jobname 'blocktest', input './blocktest', result 'blocktest'
fonts           > latin modern fonts are not preloaded
languages       > language 'en' is active
open source     > 2 > 3 > /home/adrien/dev/testConteXt/blocktest.tex
fonts           > preloading latin modern fonts (second stage)
fonts           > 'fallback modern-designsize rm 12pt' is loaded
close source    > 2 > 3 > /home/adrien/dev/testConteXt/blocktest.tex
close source    > 1 > 3 > /opt/context/tex/texmf-context/tex/context/base/mkiv/cont-yes.mkiv

*

星号是提示。请问我该如何实现条件编译？

答案1

当您禁用该teacherversion模式时\startmode，命令会尝试吞噬所有内容，直到\stopmode将它们嵌入到其他命令中时才起作用。您必须首先创建teacheronly环境以确保命令存在，然后将启用边距规则的设置放在单独的mode块中。

\definemode[teacherversion][yes]

%\disablemode[teacherversion]

\definestartstop[teacheronly]

\startmode[teacherversion]
  \setupstartstop
    [teacheronly]
    [before=\startmarginrule,
     after=\stopmarginrule]
\stopmode

\starttext

Text before

\startteacheronly
  \input knuth
\stopteacheronly

Text after

\stoptext

当您想要吞噬teacheronly环境的完整内容时，您可以创建不同的定义。

\definemode[teacherversion][yes]

%\disablemode[teacherversion]

\startmode[teacherversion]
  \definestartstop
    [teacheronly]
    [before=\startmarginrule,
     after=\stopmarginrule]
\stopmode

\startnotmode[teacherversion]
  \definebuffer[teacheronly]
\stopnotmode

\starttext

Text before

\startteacheronly
  \input knuth
\stopteacheronly

Text after

\stoptext

对于上述两种方法，您都可以在设置内容之前启用/禁用模式，为了摆脱这个限制，可以使用以下解决方案，即在刷新存储的内容之前检查模式。

\definemode[teacherversion][yes]

\definebuffer[teacheronly]

\def\stopteacheronly
  {\doifmode{teacherversion}
     {\startmarginrule
      \getdefinedbuffer[teacheronly]
      \stopmarginrule}}

%\disablemode[teacherversion]

\starttext

Text before

\startteacheronly
  \input knuth
\stopteacheronly

Text after

\stoptext

相关内容