5 重新提问关于段落文本高亮显示的问题

我现有下列代码

\documentclass[fontset=windows]{ctexart}
\usepackage{color}
\usepackage{linegoal}
\newbox\HighlightPiece 
\newdimen\FirstHeight
\newdimen\FirstDepth
\newdimen\LastHeight
\newdimen\LastDepth
\newdimen\TotalHeight
\newdimen\TotalDepth
\newdimen\LineIndent
\newdimen\LineGoal

\newif\ifOnePiece

\makeatletter
\newcommand\HLGetDimensions {% 
  \setbox\HighlightPiece\lastbox
  \unskip\unpenalty
  \ifdim\wd\HighlightPiece<\linewidth
      \global\OnePiecetrue
  \else
      \global\OnePiecefalse
  \fi 
  \ifOnePiece
  \else
    \global\LastHeight\ht\HighlightPiece
    \global\LastDepth\dp\HighlightPiece
    \loop % 
    \setbox\HighlightPiece\lastbox
    \unskip\unpenalty
    \ifvoid\HighlightPiece\else
      \ifdim\wd\HighlightPiece<\linewidth
       \global\FirstHeight\ht\HighlightPiece
       \global\FirstDepth\dp\HighlightPiece
      \fi
    \repeat
 \fi
}
\newcommand\Highlight [2][yellow]
     {%
     \LineGoal\linegoal     % http://ctan.org/pkg/linegoal
     \LineIndent=\dimexpr\linewidth-\LineGoal\relax
     \vbox{%
     \hfuzz\maxdimen
     \hangindent\LineIndent
     \hangafter\m@ne
     \noindent  #2\endgraf 
     \HLGetDimensions
     }%
     \ifOnePiece
           \begingroup \fboxsep\z@
           \colorbox{#1}{#2}%
           \endgroup
     \else
        \setbox\z@\vbox{%
                        \hfuzz\maxdimen
                        \hangindent\LineIndent
                        \hangafter\m@ne
                        \noindent #2\endgraf }%
        \TotalHeight\ht\z@
        \TotalDepth\dp\z@
        \advance\TotalHeight\TotalDepth
        \advance\TotalHeight-\FirstHeight
        \advance\TotalHeight-\FirstDepth
        \begingroup % et pas \color@begingroup, cf plus bas!
          \color{#1}%
          \rlap{\hbox{\vrule\@height\FirstHeight
                            \@depth\FirstDepth
                            \@width\LineGoal
}}%
          \setbox\z@\vbox{\moveleft\LineIndent
                          \hbox{\vrule
                                \@height\TotalHeight
                               \@depth\z@
                                \@width\linewidth
}}%
        \ht\z@\z@\dp\z@-\FirstDepth\wd\z@\z@
        \lower\FirstDepth\box\z@
        \endgroup % \color@endgroup fait basculer en mode vertical!!
         \mbox{}#2%
        \LineGoal\linegoal
        \rlap{\hbox{\begingroup\color{white}%
                        \vrule\@height\LastHeight
                               \@depth\LastDepth
                               \@width\dimexpr\LineGoal+1pt\relax
                    \endgroup}}% this 1pt could be a user hook dimen.
     \fi
}%

\makeatother


\begin{document}

\mbox{}\Highlight{文字文字文字文字文字文字文字文文字文字文字文文字文字文字文字文字文字文，}文字文文字文

\mbox{}\Highlight{测试测试测试测$f(x)$试测试测试测试测试}
\[
\Highlight{$\displaystyle\int f(x),x\in A$}
\]

\end{document}

三个问题：（1）行首需加mbox{}，否则报错，如何修改代码？（2）同一段的行与行之间不需要颜色填充；（3）行间公式不加$$也会报错，如何修改代码？

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