R-alpha: S doc -> R doc

Attached is the current version of my sd2rd perl script.  It has passed
tests by Martin, Fritz and myself, and seems to work reasonably well (it
should get the arguments lists right, distinguish between VALUE and
VALUES, and know about REFERENCES and SEEALSO).

Any comments etc are most welcome.

-k

************************************************************************
#!/usr/bin/perl -w

$\ = "\n";

$parenLevel = 0;
$doprint = 1;
$needArg = 1;
$needVal = 0;
$output = "";

while (<>) {
    chop;
    &substitute;
    @word = split;

    if (/^[^.]/) { &output($_); }

    if (/^\.AG/) {
	if ($needArg) {
	    &section(0, "ARGUMENTS(");
	    $needArg = 0;
	}
	&section(1, "ARG($word[1] @@");
    }
    if (/^\.CS/) { &section(0, "USAGE("); }
    if (/^\.DN/) { $doprint = 0; }
    if (/^\.DT/) { &section(0, "DESCRIPTION("); }
    if (/^\.EX/) { &section(0, "EXAMPLES("); }
    if (/^\.FN/) { $fun = $word[1]; }
    if (/^\.(IP|PP)/) { output("PARA"); }
    if (/^\.RC/) {
	if ($needVal) {
	    $needVal = 0;	    
	    &section(0, "VALUES(\n$output\n@@");
	    $doprint = 1;
	}
	&section(1, "ARG($word[1] @@");
    }
    if (/^\.RT/) {
	$needVal = 1;
	$doprint = 0;
	$output = "";
    }
    if (/^\.SA/) { &section(0, "SEEALSO("); }
    if (/^\.SE/) { &paragraph("SIDE EFFECTS"); }
    if (/^\.SH/) {
	if ($word[1] =~ /REFERENCE/) {
	    &section(0, "REFERENCES(");
	} else {
	    &paragraph($word[1]);
	}
    }
    if (/^\.sp/) { output("BLANK"); }
    if (/^\.TL/) { &section(0, "TITLE($fun @@"); }
    if (/^\.WR/) { &section(0, ""); }

    if (/^\.AO/) {
	output("Arguments for function LANG($word[1]()) can also be");
	output("supplied to this function.");
    }
    if (/^\.GE/) {
	output("This is a generic function.");
	output("Functions with names beginning in LANG($fun.) will be");
	output("methods for this function.");
    }
    if (/^\.GR/) {
	output("Graphical parameters (see LANG(par())) may also be");
	output("supplied as arguments to this function.");
    }
    if (/^\.ME/) {
	output("This function is a method for the generic function");
	output("LANG($word[1]()) for class LANG($word[2]).");
	output("It can be invoked by calling LANG($word[1](x)) for an");
	output("object LANG(x) of the appropriate class, or directly by");
	output("calling LANG($word[1].$word[2](x)) regardless of the");
	output("class of the object.");
    }
    if (/^\.NA/) { output("Missing values (LANG(NA)s) are allowed."); }
    if (/^\.Tl/) {
	output("In addition, the high-level graphics control arguments");
	output("described under LANG(par()) and the arguments to");
	output("LANG(title()) may be supplied to this function.");
    }
}

sub substitute {
    s/\\fB/BOLD\(/g;
    s/\\fR/\)/g;
    s/\.\.\./DOTS/g;
}

sub section {
    local($level, $text) = @_;
    $n = $parenLevel - $level;
    print(")" x $n) if ($n > 0);
    if ($needVal) {
	print("VALUE(\n$output\n)");
	$needVal = 0;
    }
    print("$text") if $text;    
    $parenLevel = $level + 1;
    $doprint = 1;
}

sub paragraph {
    local($name) = @_;
    &output("PARA\nBOLD($name): ");
}
    
sub output {
    local($text) = @_;
    if ($doprint) {
	print($text);
    } elsif ($output) {
	$output .= "\n$text";
    } else {
	$output = $text;
    }
}
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