Pandoc Lua过滤器替换tex宏 [英] pandoc lua filter to replace tex macro

问题描述

我正在尝试编写pandoc lua过滤器以替换乳胶软件包mhchem中的\ ce {}命令.

这是我在\ce{NO3-}示例中尝试过的方法，但是它不起作用，并且在rtf输出文件中呈现空白:

 return {
  {
    Str = function (elem)
      if elem.text == "\\ce%{%NO3-%}%" then
        return {pandoc.Str "NO3"}
      else
        return elem
      end
    end,
  }
}
 

我的pandoc命令是:

 pandoc -s myfile.tex --lua-filter myfilter.lua -o myfile.rtf
 

解决方案

这里的主要问题是pandoc如何处理这些mhchem片段:pandoc默认情况下会丢弃它无法解析的所有LaTeX代码.示例:

 $ printf 'Nitrate (\\ce{NO3-})' | pandoc --from latex -t native
[Para [Str "Nitrate",Space,Str "()"]]
 

我们要保留这些片段，可以使用raw_tex扩展名:

 $ printf 'Nitrate (\\ce{NO3-})' | pandoc --from latex+raw_tex -t native
[Para [Str "Nitrate",Space,Str "(",RawInline (Format "latex") "\\ce{NO3-}",Str ")"]]
 

现在我们有机会匹配此文本.如我们所见，我们需要匹配RawInline元素而不是Str:

 return {
  {
    RawInline = function (raw)
      local formula = raw.text:match '\\ce{([^ ]+)}'
      if raw.format == 'latex' and formula then
        return pandoc.Str(formula)
      end
    end
  }
}
 

这将删除tex命令并在其中呈现原始代码. 要匹配最初的示例:

 return {
  {
    RawInline = function (raw)
      local formula = raw.text:match '\\ce{NO3%-}'
      if raw.format == 'latex' and formula then
        return pandoc.Str('NO3')
      end
    end
  }
}
 

最后，pandoc命令为:

 pandoc --from latex+raw_tex -s myfile.tex --lua-filter myfilter.lua -o myfile.rtf
 

用于匹配的模式不太正确，如@PaulKulchenko指出的那样.请参见Lua参考手册的模式"部分. /p>

I am trying to write a pandoc lua filter to replace the \ce{} command from the latex package mhchem.

This is what I tried with the example of \ce{NO3-}, but it doesn't work and renders a blank in the rtf output file:

return {
  {
    Str = function (elem)
      if elem.text == "\\ce%{%NO3-%}%" then
        return {pandoc.Str "NO3"}
      else
        return elem
      end
    end,
  }
}

My pandoc command is:

pandoc -s myfile.tex --lua-filter myfilter.lua -o myfile.rtf

解决方案

The main issue here is how pandoc handles these mhchem snippets: pandoc, by default, drops all LaTeX code which it cannot parse. Example:

$ printf 'Nitrate (\\ce{NO3-})' | pandoc --from latex -t native
[Para [Str "Nitrate",Space,Str "()"]]

We want to keep those snippets, which we can by using the raw_tex extension:

$ printf 'Nitrate (\\ce{NO3-})' | pandoc --from latex+raw_tex -t native
[Para [Str "Nitrate",Space,Str "(",RawInline (Format "latex") "\\ce{NO3-}",Str ")"]]

Now we have a chance of matching this text. As we can see, we need to match on RawInline elements instead of Str:

return {
  {
    RawInline = function (raw)
      local formula = raw.text:match '\\ce{([^ ]+)}'
      if raw.format == 'latex' and formula then
        return pandoc.Str(formula)
      end
    end
  }
}

Which will remove the tex command and render the raw code inside. To match the initial example:

return {
  {
    RawInline = function (raw)
      local formula = raw.text:match '\\ce{NO3%-}'
      if raw.format == 'latex' and formula then
        return pandoc.Str('NO3')
      end
    end
  }
}

Finally, the pandoc command is:

pandoc --from latex+raw_tex -s myfile.tex --lua-filter myfilter.lua -o myfile.rtf

The pattern used for matching wasn't quite correct, as @PaulKulchenko noted. See "Patterns" section of the Lua reference manual.

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