Declaration specifiers may appear in any order. However, not all
combinations are permitted. A declaration specifier must consist of zero or
-more @<qualifiers>, and one of the following, up to reordering.
+more @<qualifier>s, and one of the following, up to reordering.
\begin{itemize}
\item @<type-name>
\item @"struct" @<identifier>, @"union" @<identifier>, @"enum" @<identifier>
\subsubsection{Declarators}
\begin{grammar}
-<declarator>$[k]$ ::= @<pointer>^* <primary-declarator>$[k]$
+<declarator>$[k, a]$ ::= @<pointer>^* <primary-declarator>$[k, a]$
-<primary-declarator>$[k]$ ::= $k$
-\alt "(" <primary-declarator>$[k]$ ")"
-\alt <primary-declarator>$[k]$ @<declarator-suffix>
+<primary-declarator>$[k, a]$ ::= $k$
+\alt "(" <primary-declarator>$[k, a]$ ")"
+\alt <primary-declarator>$[k, a]$ @<declarator-suffix>$[a]$
<pointer> ::= "*" @<qualifier>^*
-<declarator-suffix> ::= "[" <c-fragment> "]"
-\alt "(" <arguments> ")"
+<declarator-suffix>$[a]$ ::= "[" <c-fragment> "]"
+\alt "(" $a$ ")"
<argument-list> ::= $\epsilon$ | "..."
\alt <list>$[\mbox{@<argument>}]$ @["," "..."@]
<argument> ::= @<declaration-specifier>^+ <argument-declarator>
-<argument-declarator> ::= <declarator>$[\mbox{@<identifier> @! $\epsilon$}]$
+<argument-declarator> ::=
+ <declarator>$[\mbox{@<identifier> @! $\epsilon$}, \mbox{@<argument-list>}]$
-<simple-declarator> ::= <declarator>$[\mbox{@<identifier>}]$
-
-<dotted-name> ::= <identifier> "." <identifier>
+<simple-declarator> ::=
+ <declarator>$[\mbox{@<identifier>}, \mbox{@<argument-list>}]$
\end{grammar}
The declarator syntax is taken from C, but with some differences.
The remaining differences are (I hope) a matter of presentation rather than
substance.
+There is additional syntax to support messages and methods which accept
+keyword arguments.
+
+\begin{grammar}
+<keyword-argument> ::= <argument> @["=" <c-fragment>@]
+
+<keyword-argument-list> ::=
+ @[<list>$[\mbox{@<argument>}]$@]
+ "?" @[<list>$[\mbox{@<keyword-argument>}]$@]
+
+<method-argument-list> ::= <argument-list> @! <keyword-argument-list>
+
+<dotted-name> ::= <identifier> "." <identifier>
+
+<keyword-declarator>$[k]$ ::=
+ <declarator>$[k, \mbox{@<method-argument-list>}]$
+\end{grammar}
+
\subsection{Class definitions} \label{sec:syntax.module.class}