doc/: Work in progress.

[sod] / doc / syntax.tex

diff --git a/doc/syntax.tex b/doc/syntax.tex
index 65bd7274d926fc7f520bbf019d32f49212078701..18b46e176e64852ad2ad3ca01200cdbc751ee18a 100644 (file)
--- a/doc/syntax.tex
+++ b/doc/syntax.tex
@@ -25,51 +25,6 @@
 
 \chapter{Module syntax} \label{ch:syntax}
 
-%%%--------------------------------------------------------------------------
-\section{Notation} \label{sec:syntax.notation}
-
-Fortunately, Sod is syntactically quite simple.  The notation is slightly
-unusual in order to make the presentation shorter and easier to read.
-
-Anywhere a simple nonterminal name $x$ may appear in the grammar, an
-\emph{indexed} nonterminal $x[a_1, \ldots, a_n]$ may also appear.  On the
-left-hand side of a production rule, the indices $a_1$, \ldots, $a_n$ are
-variables which vary over all nonterminal and terminal symbols, and the
-variables may also appear on the right-hand side in place of a nonterminal.
-Such a rule stands for a family of rules, in each variable is replaced by
-each possible simple nonterminal or terminal symbol.
-
-The letter $\epsilon$ denotes the empty nonterminal
-\begin{quote}
-  \syntax{$\epsilon$ ::=}
-\end{quote}
-
-The following indexed productions are used throughout the grammar, some often
-enough that they deserve special notation.
-\begin{itemize}
-\item @[$x$@] abbreviates @<optional>$[x]$, denoting an optional occurrence
-  of $x$:
-  \begin{quote}
-    \syntax{@[$x$@] ::= <optional>$[x]$ ::= $\epsilon$ @! $x$}
-  \end{quote}
-\item $x^*$ abbreviates @<zero-or-more>$[x]$, denoting a sequence of zero or
-  more occurrences of $x$:
-  \begin{quote}
-    \syntax{$x^*$ ::= <zero-or-more>$[x]$ ::=
-      $\epsilon$ @! <zero-or-more>$[x]$ $x$}
-  \end{quote}
-\item $x^+$ abbreviates @<one-or-more>$[x]$, denoting a sequence of one or
-  more occurrences of $x$:
-  \begin{quote}
-    \syntax{$x^+$ ::= <one-or-more>$[x]$ ::= <zero-or-more>$[x]$ $x$}
-  \end{quote}
-\item @<list>$[x]$ denotes a sequence of one or more occurrences of $x$
-  separated by commas:
-  \begin{quote}
-    \syntax{<list>$[x]$ ::= $x$ @! <list>$[x]$ "," $x$}
-  \end{quote}
-\end{itemize}
-
 %%%--------------------------------------------------------------------------
 \section{Lexical syntax} \label{sec:syntax.lex}
 
@@ -196,16 +151,16 @@ binary.  However, length and signedness indicators are not permitted.
 
 <not-star-or-slash> ::= any character other than "*" or  "/"
 
-<line-comment> ::= "//" @<not-newline>^* <newline>
+<line-comment> ::= "/\,/" @<not-newline>^* <newline>
 
 <newline> ::= a newline character
 
 <not-newline> ::= any character other than newline
 \end{grammar}
 
-Comments are exactly as in C99: both traditional block comments `\texttt{/*}
-\dots\ \texttt{*/}' and \Cplusplus-style `\texttt{//} \dots' comments are
-permitted and ignored.
+Comments are exactly as in C99: both traditional block comments `@|/*| \dots\
+@|*/|' and \Cplusplus-style `@|/\,/| \dots' comments are permitted and
+ignored.
 
 
 \subsection{Special nonterminals} \label{sec:syntax.lex.special}
@@ -407,14 +362,15 @@ though the only operators currently defined act on integer values only.
 
 \subsubsection{The expression evaluator}
 \begin{grammar}
-<expression> ::= <term> | <expression> "+" <term> | <expression> "-" <term>
+<expression> ::= <term> | <expression> "+" <term> | <expression> "--" <term>
 
 <term> ::= <factor> | <term> "*" <factor> | <term> "/" <factor>
 
-<factor> ::= <primary> | "+" <factor> | "-" <factor>
+<factor> ::= <primary> | "+" <factor> | "--" <factor>
 
 <primary> ::=
      <integer-literal> | <string-literal> | <char-literal> | <identifier>
+\alt "<" <plain-type> ">"
 \alt "?" <s-expression>
 \alt "(" <expression> ")"
 \end{grammar}
@@ -456,8 +412,10 @@ recognized.
 
 <qualifier> ::= <atomic> | "const" | "volatile" | "restrict"
 
+<plain-type> ::= @<declaration-specifier>^+ <abstract-declarator>
+
 <atomic-type> ::=
-  <atomic> "(" @<declaration-specifier>^+ <abstract-declarator> ")"
+  <atomic> "(" <plain-type> ")"
 
 <atomic> ::= "atomic" | "_Atomic"
 
@@ -517,14 +475,15 @@ All of these have their usual C meanings.
 <declarator-suffix>$[a]$ ::= "[" <c-fragment> "]"
 \alt "(" $a$ ")"
 
-<argument-list> ::= $\epsilon$ | "..."
-\alt <list>$[\mbox{@<argument>}]$ @["," "..."@]
+<argument-list> ::= $\epsilon$ | "\dots"
+\alt <list>$[\mbox{@<argument>}]$ @["," "\dots"@]
 
 <argument> ::= @<declaration-specifier>^+ <argument-declarator>
 
 <abstract-declarator> ::= <declarator>$[\epsilon, \mbox{@<argument-list>}]$
 
 <argument-declarator> ::= <declarator>$[\mbox{@<identifier> @! $\epsilon$}]$
+
 <argument-declarator> ::=
   <declarator>$[\mbox{@<identifier> @! $\epsilon$}, \mbox{@<argument-list>}]$