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%\usepackage[T1]{fontenc}
%\usepackage[latin9]{inputenc}
\usepackage{mathpazo}
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\usepackage{verbatim}
\newlength\sidebar
\newlength\envrule
\newlength\envborder
\setlength\sidebar{1.5mm}
\setlength\envrule{0.4pt}
\setlength\envborder{2.5mm}
\definecolor{exampleborder}{rgb}{0,0,.7}
\definecolor{examplebg}{rgb}{.9,.9,1}
\newsavebox\envbox
\newcounter{example}
\newcounter{defi}
\newenvironment{example}[1][EXAMPLE]{%
\refstepcounter{example}%
\SpecialEnv{Example \theexample ~ #1}{exampleborder}{examplebg}{}{}%
}{%
\endSpecialEnv
}
\definecolor{grammarruleborder}{rgb}{.9,0,0}
\definecolor{grammarrulebg}{rgb}{1,.9,.9}
\newenvironment{grammarrule}[1][]{% Default grammarrule has no title
\par
\SpecialEnv{#1}{grammarruleborder}{grammarrulebg}{grammarruleborder}{}%
}{%
\endSpecialEnv
}
\definecolor{defiborder}{rgb}{.5,0.5,0.9}
\definecolor{defibg}{rgb}{1,.9,0}
\newenvironment{defi}[1][Definition]{
\par
\refstepcounter{defi}%
\SpecialEnv{Definition \thedefi: #1}{defiborder}{defibg}{defiborder}{}%
}{%
\endSpecialEnv
}
\def\Empty{}
% #1 title (if any)
% #2 sidebar (and title bg) color
% #3 background color
% #4 border color (or null for no border)
% #5 Counter, if any.
\newenvironment{SpecialEnv}[5]{%
\par
\def\EnvSideC{#2}% To use later (in end)
\def\EnvBackgroundC{#3}%
\def\EnvFrameC{#4}%
\flushleft
\setlength\leftskip{-\sidebar}%
\addtolength\leftskip{-\envborder}%
\noindent \nobreak
% Check if title is null:
\ifx\delimiter#1\delimiter\else
% If a title is specified, then typeset it in reverse color
\colorbox{\EnvSideC}{%
\hspace{-\leftskip}% usually positive
\hspace{-\fboxsep}%
\footnotesize\sffamily\bfseries\textcolor{white}{#1}%
\hspace{\envborder}}%
\par\nobreak
\setlength\parskip{-0.2pt}% Tiny overlap to counter pixel round-off errors
\nointerlineskip
\fi
% Make side-bar
\textcolor{\EnvSideC}{\vrule width\sidebar}%
% collect body in \envbox:
\begin{lrbox}\envbox
\begin{minipage}{\hsize}%
% insert counter, if any:
\ifx\delimiter#5\delimiter\else#5.\enspace\fi
\ignorespaces
}{\par
\end{minipage}\end{lrbox}%
% body is collected. Add background color
\setlength\fboxsep\envborder
\ifx\EnvFrameC\Empty % no frame
\colorbox{\EnvBackgroundC}{\usebox\envbox}%
\else % frame
\setlength\fboxrule\envrule
\addtolength\fboxsep{-\envrule}%
\fcolorbox{\EnvFrameC}{\EnvBackgroundC}{\usebox\envbox}%
\fi
\nobreak \hspace{-2\envborder}\null
\endflushleft
}