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jhr |
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% grammar.sty
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%
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% A package for writing grammars.
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%
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% Usage:
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%
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% Each grammar fragment lives in a Grammar environment:
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%
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% \begin{Grammar}
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% ... rules ...
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% \end{Grammar}
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%
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% The Grammar environment can have an optional argument, which is used in
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% HTML generation.
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% Each rule is a collection of productions with the same lhs:
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%
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% \begin{Rules}{nonterm}
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% ... right-hand sides ...
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% \end{Rules}
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%
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% where "nonterm" is the lhs nonterminal. A right-hand side is
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% formatted with the \RHS{} command. The following commands may
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% be used inside a \RHS{} command:
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%
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% \GRP{item} -- (item)
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% \OPT{item} -- item?
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% \OPTGRP{item} -- same as \OPT{\GRP{item}}
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% \LIST{item} -- item*
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% \LISTGRP{item} -- same as \LIST{\GRP{item}}
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% \LISTONE{item} -- item+
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% \LISTONEGRP{item} -- same as \LISTONE{\GRP{item}}
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%
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% To support lexical definitions, we also have the form
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% \begin{OneOfRule}{nonterm}
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% ... items ...
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% \end{OneOfRule}
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%
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% where "nonterm" is the lhs nonterminal. The items are formatted with
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% the \ITEM{item} command.
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%
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% This package also defines the following font commands:
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%
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% \kw{item} -- for keywords (default is bold \tt)
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% \nt{item} -- for nonterminals (default is \it)
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% \term{item} -- for terminal symbols (default is \it)
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% \sym{item} -- for literal symbols (default is bold \tt)
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%
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\RequirePackage{ifthen}
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\RequirePackage{amstext}
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\makeatletter
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\newboolean{G@firstrule}
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\newcommand{\G@sepsymb}{
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\ifthenelse{\boolean{G@firstrule}}{$::=$}{$\mid$}}
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\newcommand{\G@RHS}[2][]{
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\G@sepsymb{} & {#2} & {#1} \\
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\setboolean{G@firstrule}{false}%
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}
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\newcommand{\G@CONT}[1]{
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& \hspace*{1em} {#1} & \\
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}
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\newcommand{\G@ITEM}[1]{%
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\mbox{%
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\ifthenelse{\boolean{G@firstrule}}{$::=$}{$\mid$} #1}
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\setboolean{G@firstrule}{false}%
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}
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%
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% font commands
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\newcommand{\kw}[1]{\texttt{\bfseries{}#1}}
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\newcommand{\nt}[1]{\textit{#1}}
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\newcommand{\term}[1]{\textit{#1}}
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\newcommand{\sym}[1]{\kw{#1}}
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\newenvironment{Grammar}[1][]{%
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\begin{list}{}{
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\setlength{\leftmargin}{4em}%
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\setlength{\itemindent}{2em}%
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\setlength{\itemsep}{0em}%
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\setlength{\parsep}{0em}%
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}
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\newcommand{\GRP}[1]{$(\text{##1})$}%
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\newcommand{\OPT}[1]{$\text{\protect{##1}}^{\textit{opt}}$}%
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\newcommand{\OPTGRP}[1]{$(\text{##1})^{\textit{opt}}$}%
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\newcommand{\LIST}[1]{$\text{\protect{##1}}^{*}$}%
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\newcommand{\LISTGRP}[1]{$(\text{##1})^{*}$}%
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\newcommand{\LISTONE}[1]{$\text{\protect{##1}}^{+}$}%
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\newcommand{\LISTONEGRP}[1]{$(\text{##1})^{+}$}%
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\newenvironment{Rules}[1]{%
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\begin{samepage}%
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\setboolean{G@firstrule}{true}%
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\newcommand{\RHS}{\G@RHS}%
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\newcommand{\CONT}{\G@CONT}%
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\item[\nt{##1}]\mbox{}\\
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\begin{tabular}{clr}%
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}{%
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\end{tabular}%
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\end{samepage}\pagebreak[2]%
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}
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\newenvironment{OneOfRule}[1]{%
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\begin{samepage}%
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\setboolean{G@firstrule}{true}%
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\newcommand{\ITEM}{\G@ITEM}%
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\item[\nt{##1}]\mbox{}\\
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}{%
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\end{samepage}\pagebreak[2]%
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}
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}{%
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\end{list}
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}
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\makeatother
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