crygame-slow.sty

% Author: Sven Laur (https://github.com/swenlaur)

\NeedsTeXFormat{LaTeX2e}
\ProvidesPackage{game-alg}
\RequirePackage{amssymb}
\RequirePackage{amsmath}
\RequirePackage{array}


% Lengths for restoring old values
\newlength{\oldarrayrulewidth}
\newlength{\oldtabcolsep}
\newlength{\algblocksep}

% A vertical space after if, for and while blocks
\setlength{\algblocksep}{2.0ex}


% Phantom line
\newcommand{\vspacex}[1]{\raisebox{-#1}{\rule{0pt}{#1}}}
\newcommand{\addalgblockspace}{\raisebox{-\algblocksep}{\rule{0pt}{\algblocksep}}}


% Code block
% A complex wrapper that builds a tabular around the code block 
% to get the nice square bracket with constant with to the right.
% Externally behaves like ordinary align environment exept
% each line must start width & and end with \\
% Recursive nesting is allowed. 
% (Extra spaces are deliberately commented out)
\newenvironment{cblock} 
{%
  \setlength{\oldarrayrulewidth}{\arrayrulewidth}%
  \setlength{\oldtabcolsep}{\tabcolsep}% 
  \setlength{\arrayrulewidth}{0.62pt}%
  \setlength{\tabcolsep}{0em}%
  \begin{tabular}{|m{0.2em}>{\hspace*{0.1em}$}l<{$}}
  \cline{1-1}
}
{
  \\
  \cline{1-1}
  \end{tabular}%
  \setlength{\arrayrulewidth}{\oldarrayrulewidth}%
  \setlength{\tabcolsep}{\oldtabcolsep}%
}

% A game block
\newenvironment{game}[1]
{%
  \begin{tabular}{l}%
  \ensuremath{#1} \\
  \begin{cblock}%
}
{%
  \end{cblock}%
  \end{tabular}%
}

% A function block
\newenvironment{fblock}[1]
{%
  \begin{tabular}{l}%
  \ensuremath{#1} \\
  \begin{cblock}%
}
{%
  \end{cblock}%
  \end{tabular}%
}



% A while loop block 
\newenvironment{whileblock}[1]
{%
  \begin{tabular}{l}%
  \WHILE \ensuremath{#1}\ \DO \\
  \begin{cblock}%
}
{%
  \end{cblock}%
  \addalgblockspace%
  \end{tabular}% 
}

% A  for block 
\newenvironment{forblock}[1]
{%
  \begin{tabular}{l}%
  \FOR \ensuremath{#1}\ \DO \\
  \begin{cblock}%
}
{%
  \end{cblock}%
  \addalgblockspace%
  \end{tabular}% 
}

% A if block 
\newenvironment{ifblock}[1]
{%
  \begin{tabular}{l}%
  \IF \ensuremath{#1}\ \THEN \\
  \begin{cblock}%
}
{%
  \end{cblock}%
  \addalgblockspace%
  \end{tabular}% 
}

% A if block 
\newenvironment{elseifblock}[1]
{%
  \begin{tabular}{l}%
  \ELSE \IF \ensuremath{#1}\ \THEN \\
  \begin{cblock}%
}
{%
  \end{cblock}%
  \addalgblockspace%
  \end{tabular}% 
}


% A else block 
\newenvironment{elseblock}
{%
  \begin{tabular}{l}%
  \ELSE  \\
  \begin{cblock}%
}
{%
  \end{cblock}%
  \addalgblockspace%
  \end{tabular}% 
}