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%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%% %%
%% synproof.sty v. 1.0 by Paul Isambert %%
%% This set of macros is published under the LaTeX Project Public License. %%
%% %%
%% Comments, suggestions and bugs: %%
%% %%
%% zappathustra@free.fr %%
%% %%
%% http://paulisambert.free.fr/ %%
%% %%
%% Enjoy! %%
%% %%
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
\NeedsTeXFormat{LaTeX2e}
\ProvidesPackage{synproof}[2007/06/09 Drawing syntactic proofs with PSTricks.]
\RequirePackage{ifthen}
\RequirePackage{pstricks}
\RequirePackage{pst-node}
\RequirePackage{keyval}
%%%%%%%%%%%%%%%%%%%%%%%
% Options declaration %
%%%%%%%%%%%%%%%%%%%%%%%
\DeclareOption{symbols}{%
\newcommand{\Exists}{$\exists$}%
\newcommand{\Forall}{$\forall$}%
\newcommand{\Neg}{$\neg$}%
\newcommand{\And}{$\wedge$}%
\newcommand{\Or}{$\vee$}%
\newcommand{\Falsum}{$\bot$}%
\newcommand{\Implies}{$\rightarrow$}%
}
\ProcessOptions\relax
\makeatletter
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% Counters, Lengths and Keys %
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% This is a "perverted" version of \newcounter, which allows you
% (or rather me) to create a new counter even if it's already defined.
\def\newctr#1{\@definecounter{#1}}
\newcounter{lab}
\newcounter{infline}
\newcounter{embedding}
\newcounter{endassumption}
\newcounter{step}
\newcommand{\LineNum}[1]{\setcounter{step}{#1}\addotocounter{step}{-1}}
% \Start and \Num set the position of the starting point of the
% assumption line and the position of the line number respectively,
% and are not accessible from user's interface. See the documentation
% for the other lengths.
\newlength{\Start}
\setlength{\Start}{.8cm}
\newlength{\Num}
\setlength{\Num}{1cm}
\newlength{\NumToEx}
\setlength{\NumToEx}{2cm}
\define@key{synproof}{NumToEx}{\addtolength{\NumToEx}{#1cm}}
\newlength{\ExToRule}
\setlength{\ExToRule}{8cm}
\define@key{synproof}{ExToRule}{\addtolength{\ExToRule}{#1cm}}
\newlength{\OutLine}
\setlength{\OutLine}{-.6cm}
\define@key{synproof}{OutLine}{\addtolength{\OutLine}{#1mm}}
\newlength{\LineSpace}
\setlength{\LineSpace}{.15cm}
\define@key{synproof}{LineSpace}{\addtolength{\LineSpace}{#1mm}}
\newlength{\AssumeLine}
\setlength{\AssumeLine}{10cm}
\define@key{synproof}{AssumeLine}{\addtolength{\AssumeLine}{#1cm}}
\define@key{synproof}{HorAlign}{%
\addtolength{\OutLine}{#1cm}%
\addtolength{\Start}{#1cm}%
\addtolength{\AssumeLine}{#1cm}%
\addtolength{\Num}{#1cm}%
\addtolength{\NumToEx}{#1cm}%
\addtolength{\ExToRule}{#1cm}}
\newcommand{\ResetDim}{%
\setlength{\OutLine}{-.6cm}%
\setlength{\Start}{.8cm}%
\setlength{\AssumeLine}{10cm}%
\setlength{\Num}{1cm}%
\setlength{\NumToEx}{2cm}%
\setlength{\ExToRule}{8cm}%
\setlength{\LineSpace}{.15cm}%
}
\newcommand{\SetDim}[1]{\setkeys{synproof}{#1}}
%%%%%%%%%%%%%%%%%%%%%%%
% Definition of \step %
%%%%%%%%%%%%%%%%%%%%%%%
\newcommand{\step}[3][none]{%
\@ifnextchar[%
{\step@i[#1]{#2}{#3}}%
{\step@i[#1]{#2}{#3}[none]}%
}%
\def\step@i[#1]#2#3[#4]{%
\addtocounter{infline}{-4}% Position of the line relative to the previous one
\stepcounter{step}% Line number
\ifthenelse{\equal{#1}{none}}%
{\rput[ml](\Num,\value{infline}ex){\thestep.}}% Automatic numbering and position of the line number
{\rput[ml](\Num,\value{infline}ex){#1.}}%
\rput[ml](\NumToEx,\value{infline}ex){#2}% Position of the expression
\rput[ml](\ExToRule,\value{infline}ex){#3}% Position of the rule
\ifthenelse{\equal{#4}{none}}{}{% Optional label
\expandafter\newsavebox\expandafter{\csname lab@#4\endcsname}%
\expandafter\savebox\expandafter{\csname lab@#4\endcsname}{%
\ifthenelse{\equal{#1}{none}}%
{\thestep}%
{#1}%
}%
\@namedef{#4}{\expandafter\usebox\expandafter{\csname lab@#4\endcsname}}% Creation of the command to call the label
}%
}%
%%%%%%%%%%%%%%%
% Environment %
%%%%%%%%%%%%%%%
\newenvironment{synproof}[2][]{%
\noindent%
\setkeys{synproof}{#1}%
\begin{pspicture}(-1,0)(15,-#2)%
\setcounter{step}{0}%
\setcounter{infline}{0}%
}%
{\end{pspicture}}%
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% \assumption and \assumend %
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
\newcommand{\assumption}{%
\addtolength{\OutLine}{\LineSpace}% Increases the position of the assumption line by the value of \LineSpace
\stepcounter{embedding}%
\expandafter\newctr\expandafter{\alph{embedding}begin@ss}% This counter is created on the fly to keep track of the starting positions
\expandafter\setcounter\expandafter{\alph{embedding}begin@ss}{\value{infline}}% of running assumptions
\expandafter\addtocounter\expandafter{\alph{embedding}begin@ss}{-4}%
}%
\newcommand{\assumend}{%
\setcounter{endassumption}{\value{infline}}% Tuning of the end position of the assumption line. Should not be modified.
\addtocounter{endassumption}{-2}%
\psline[linewidth=.5pt]%
(\Start,\value{\alph{embedding}begin@ss}ex)%
(\OutLine,\value{\alph{embedding}begin@ss}ex)%
(\OutLine,\value{endassumption}ex)%
(\AssumeLine,\value{endassumption}ex)%
\addtocounter{embedding}{-1}% Back to the previous running assumption
\addtolength{\OutLine}{-\LineSpace}% Back to the previous setting of the line position
}%
\makeatother
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