#!/usr/bin/perl
# 
# defs-parse.pl : Gtk+ defs format parser and code generator.
#
# Author: Mike Kestner <mkestner@speakeasy.net>
#
# <c> 2001 Mike Kestner

%maptypes = (
	'none', "void", 'gboolean', "bool", 'gint', "int", 'guint', "uint",
	'guint32', "uint", 'const-gchar', "String", 'GObject', "GLib.Object",
	'gchar', "String");

%marshaltypes = (
	'none', "void", 'gboolean', "bool", 'gint', "int", 'guint', "uint",
	'guint32', "uint", 'const-gchar', "IntPtr", 'GObject', "IntPtr",
	'gchar', "IntPtr");

while ($def = get_def()) {

	if ($def =~ /^\(define-(enum|flags)/) {
		gen_enum (split (/\n/, $def));
	} elsif ($def =~ /^\(define-object (\w+)/) {
		$name = $1;
		$def =~ /c-name "(\w+)"/;
		$cname=$1;
		$def =~ s/\n\s*//g;
		$objects{$cname} = $def;
		$maptypes{$cname} = $name;
		$marshaltypes{$cname} = "IntPtr";
	} elsif ($def =~ /^\(define-(prop|event|method)/) {
		$def =~ /of-object "(\w+)"/;
		$cname=$1;
		$def =~ s/\n\s*//g;
		$objects{$cname} .= "\n$def";
	} elsif ($def =~ /^\(define-(interface)/) {
		# Nothing much to do here, I think.
	} elsif ($def =~ /^\(define-(boxed|function)/) {
		# Probably need to handle these though...
	} else {
		die "Unexpected definition $def\n";
	}

}

foreach $key (sort (keys (%objects))) {
	next if ($key !~ /(GtkBin|GtkButton|GtkContainer|GtkObject|GtkWidget|GtkWindow)$/);
	gen_object (split (/\n/, $objects{$key}));
}

###############
# subroutines
###############

# Gets a single definition from the input stream.
sub get_def
{
	while ($line = <STDIN>) {
		next if ($line !~ /^\(define/);
		$expr = $line;
		do { 
			$line = <STDIN>; 
			$expr .= $line; 
		} until ($line =~ /^\)/);
		return $expr;
	}
	return;
}

# Converts a dash or underscore separated name to StudlyCaps.
sub StudCaps
{
	my ($symb) = @_;
	$symb =~ s/^([a-z])/\u\1/;
	$symb =~ s/[-_]([a-z])/\u\1/g;
	$symb =~ s/[-_](\d)/\1/g;
	return $symb;
}

# Code generation for the enum and flags definitions.
sub gen_enum 
{
	my (@lines) = @_;
	$line = $lines[$pos=0];
	$line =~ /^\(define-(enum|flags) (\w+)/;
	$type = $1;
	$typename = $2;

	$line = $lines[++$pos];
	$line =~ /\(in-module "(\w+)"/;
	$namespace = $1;

	$maptypes{"$namespace$typename"} = $typename;
	$marshaltypes{"$namespace$typename"} = "int";

	do { $line = $lines[++$pos]; } until ($line =~ /\(values/);

	@enums = ();
	while ($line = $lines[++$pos]) {
		last if ($line =~ /^\s*\)/);
		if ($line =~ /\((.+)\)/) {
			($name, $dontcare, $val) = split (/ /, $1);
			$name =~ s/\"//g;
			$name = StudCaps ($name);
			@enums = (@enums, "$name:$val");
		}
	}

	$dir = "../generated/" . lc ($namespace);
	`mkdir -p $dir`;

	open (OUTFILE, ">$dir/$typename.cs") || die "can't open file";
	
	print OUTFILE "// Generated file: Do not modify\n\n";
	print OUTFILE "namespace $namespace {\n\n";
	print OUTFILE "\t/// <summary> $typename Enumeration </summary>\n";
	print OUTFILE "\t/// <remarks> Valid values:\n";
	print OUTFILE "\t///\t<list type = \"bullet\">\n";
	foreach $enum (@enums) {
		($name) = split (/:/, $enum);
		print OUTFILE "\t///\t\t<item> $name </item>\n"
	}
	print OUTFILE "\t///\t</list>\n\t/// </remarks>\n\n";

	if ($type eq "flags") {
		print OUTFILE "\tusing System;\n\n\t[Flags]\n";
	}
	print OUTFILE "\tpublic enum $typename {\n";

	$flag = 1;
	foreach $enum (@enums) {
		($name, $val) = split (/:/, $enum);
		if ($val) {
			print OUTFILE "\t\t$name = $val,\n";
		} elsif ($type eq "enum") {
			print OUTFILE "\t\t$name,\n";
		} else {
			print OUTFILE "\t\t$name = $flag,\n";
			$flag *= 2;
		}
	}

	print OUTFILE "\t}\n\n}\n";
	close (OUTFILE);
}

# Code generation for objects.
sub gen_object
{
	my ($objdef, @defs) = @_;
	my ($key, $typename, $parent, $dir, $namespace, $abstract, $def);
		
	$objdef =~ /define-object (\w+)/;
	$typename = $1;

	$objdef =~ /parent "(\w+)"/;
	$parent = $maptypes{$1};

	$objdef =~ /in-module "(\w+)"/;
	$dir = "../generated/" . lc ($namespace = $1);
	`mkdir -p $dir`;

	%props = ();
	%events = ();
	%methods = ();
	foreach $def (@defs) {
		if ($def =~ /define-property (\w+)/) {
			$props{StudCaps($1)} = $def;
		}elsif ($def =~ /define-event (\w+)/) {
			$events{StudCaps($1)} = $def;
		}elsif ($def =~ /define-method (\w+)/) {
			$methods{StudCaps($1)} = $def;
		}
	}

	print "Generating Class $typename in ../$dir/$typename.cs\n";
	open (OUTFILE, ">$dir/$typename.cs") || die "can't open file";
	
	print OUTFILE "// Generated file: Do not modify\n\n";
	print OUTFILE "namespace $namespace {\n\n";
	print OUTFILE "\t/// <summary> $typename Class </summary>\n";
	print OUTFILE "\t/// <remarks>\n\t///\t FIXME: Generate docs\n";
	print OUTFILE "\t/// </remarks>\n\n";
	print OUTFILE "\tpublic ";
	if ($abstract) {
		print OUTFILE "abstract ";
	}
	print OUTFILE "class $typename : $parent {\n\n";

	foreach $key (sort (keys (%props))) {
		print OUTFILE gen_prop ($key, $props{$key}, "gtk-1.3.dll");
	}

	foreach $key (sort (keys (%methods))) {
		print OUTFILE gen_method ($key, $methods{$key}, "gtk-1.3.dll");
	}

	print OUTFILE "\t}\n}\n";
	close (OUTFILE);
	print "done\n";
}

sub gen_prop ()
{
	my ($name, $def, $dll) = @_;
	my ($cname, $mode, $sret, $mret, $docs, $code);

	$def =~ /define-property (\w+)/;
	$cname = $1;

	$def =~ /prop-type "(\w+)/;
	if (exists ($objects{$1})) {
		$sret = $maptypes{$1};
		$mret = "GLib.Object";
	} elsif (exists ($maptypes{$1})) {
		$sret = $maptypes{$1};
		$mret = $marshaltypes{$1};
	} else {
		$sret = $mret = $1;
	}

	$def =~ /doc-string "(.+)"\)/;
	$docs = $1;

	$mode = 0;
	if ($def =~ /\(readable #t\)/) {
		$mode = 1;
	}

	if (($def =~ /\(writeable #t\)/) && ($def !~ /\(construct-only #t\)/)) {
		$mode += 2;
	}

	$code = "\t\t/// <summary> $name Property </summary>\n";
	$code .= "\t\t/// <remarks>\n\t\t///\t$docs\n";
	$code .= "\t\t/// </remarks>\n\n";
	$code .= "\t\tpublic $sret $name {\n";
	if ($mode & 1) { 
		$code .= "\t\t\tget {\n\t\t\t\t$mret val;\n";
		$code .= "\t\t\t\tGetProperty (\"$cname\", out val);\n";
		$code .= "\t\t\t\treturn ";
		if ($sret ne $mret) { 
			$code .= "($sret) ";
		}
		$code .= "val;\n\t\t\t}\n";
	}
	if ($mode & 2) { 
		$code .= "\t\t\tset {\n";
		$code .= "\t\t\t\tSetProperty (\"$cname\", ($mret) value);\n";
		$code .= "\t\t\t}\n";
	}
	$code .= "\t\t}\n\n";
	return $code;
}

# Generate the code for a method definition.
sub gen_method
{
	my ($name, $def, $dll) = @_;
	my ($cname, $sret, $ret, $mret, $sig, $call, $pinv, $code);

	$def =~ /\(c-name "(\w+)"/;
	$cname = $1;

	$def =~ /return-type "(\w+)/;
	if (exists ($maptypes{$1})) {
		$sret = $maptypes{$1};
		$mret = $marshaltypes{$1};
		$ret = $1;
	} else {
		$sret = $mret = $ret = $1;
	}

	($call, $pinv, $sig) = gen_param_strings($def);

	$code = "\t\t/// <summary> $name Method </summary>\n";
	$code .= "\t\t/// <remarks>\n\t\t///\t FIXME: Generate docs\n";
	$code .= "\t\t/// </remarks>\n\n";
	$code .= "\t\t[DllImport(\"$dll\", CharSet=CharSet.Ansi,\n";
	$code .= "\t\t\t   CallingConvention=CallingConvention.Cdecl)]\n";
	$code .= "\t\tstatic extern $mret $cname (IntPtr obj$pinv);\n\n";
	$code .= "\t\tpublic $sret $name ($sig)\n";
	$code .= "\t\t{\n\t\t\t";
	if ($sret ne "void") { $code .= "return "; }
	$call = "$cname (RawObject$call)";
	if ($sret eq $mret) { 
		$code .= "$call";
	} elsif ($sret eq "String") {
		$code .= "Marshal.PtrToStringAnsi($call)";
	} elsif ($mret eq "int") {
		$code .= "($sret) $call";
	} elsif (exists ($objects{$ret})) {
		$code .= "($sret) GLib.Object.GetObject($call)";
	} else {
		die "Unexpected return type match $sret:$mret\n";
	}
	$code .= ";\n\t\t}\n\n";
	return $code;
}

# Generate the DllImport, signature, and call parameter strings.
sub gen_param_strings
{
	my ($def) = @_;
	my ($call, $parm, $pinv, $sig);

	$call = $pinv = $sig = "";
	if ($def =~ /parameters'\((.*)\)\)\)/) {
		foreach $parm (split(/\)'\(/, $1)) {
			$parm =~ s/\*//g;
			$parm =~ /"(.*)" "(.*)"/;
			$pinv .= ", $marshaltypes{$1} $2";
			if ($sig) { $sig .= ', '; }
			$sig .= "$maptypes{$1} $2";
			if ($maptypes{$1} eq $marshaltypes{$1}) {
				$call .= ", $2";
			} elsif (exists ($objects{$1})) {
				$call .= ", $2.Handle";
			} elsif ($1 =~ /gchar/) {
				$call .= ", Marshal.StringToHGlobalAnsi($2)";
			} elsif ($marshaltypes{$1} = "int") {
				$call .= ", (int) $2";
			} else {
				die "Unexpected type encountered $1\n";
			}
		}
	}
	return ($call, $pinv, $sig);
}