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<P><FONT SIZE="5">4.12 Macro Calls</FONT><BR>
<P>A macro call consists of a name optionally followed
by an actual parameter list. The number of parameters in
the actual parameter list must be the same as the number
of formal parameters specified in the definition of the
macro. If the macro has no formal parameter list, its call
must have no actual parameter list.
<P>
<PRE>
macro_call = name [actual_parameter_list]
actual_parameter_list =
"@(" actpar { "@," actpar } "@)"
actpar = expression |
( whitespace "@""" expression
"@""" whitespace )
whitespace = {" " | eol }
</PRE>
<P>FunnelWeb allows parameters to be passed directly, or
delimited by special double quotes. Each form is useful under different
circumstances. Direct specification is useful where the
parameters are short and can be all placed on one line.
Double quoted parameters allow whitespace on either side
(that is not considered part of the parameter) and are
useful for laying out rather messy parameters. Here are
examples of the two forms.
<P>
<PRE>
@<Generic Loop@>@(
@"x:=1;@" @,
@"x<=10;@" @,
@"print "x=%u, x^2=%u",x,x*x;
x:=x+1;@+@"
@)
@<Colours@>@(red@,green@,blue@,yellow@)
</PRE>
<P>The two forms may be mixed within the same
parameter list.
<P>Experience has shown that, in most FunnelWeb files,
the vast majority of macros have no parameters.
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