#!/usr/bin/perl -w
#
# gtk-doc - GTK DocBook documentation generator.
# Copyright (C) 1998  Damon Chaplin
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
#

#############################################################################
# Script      : gtkdoc-mktmpl
# Description : This creates or updates the template files which contain the
#		manually-edited documentation. (A 'template' is a simple text
#		form which is filled in with the description of a function,
#		macro, enum, or struct. For functions and macros it also
#		contains fields for describing the parameters.)
#
#		This script reads in the existing templates, found in
#		tmpl/*.sgml, moves these files to tmpl/*.sgml.bak, and then
#		recreates the .sgml files according to the structure given in
#		the file $MODULE-sections.txt.
#
#		Any new templates added, or new function parameters, are
#		marked with 'FIXME' so you can do a grep to see which parts
#		need updating.
#
#		Any templates which are no longer used (i.e. they are remove
#		from $MODULE-sections.txt) are placed in the file
#		tmpl/$MODULE-unused.txt. If they are included again later
#		they are automatically copied back into position.
#		If you are certain that these templates will never be used
#		again you can delete them from $MODULE-unused.txt.
#
#		Any parameters to functions which are no longer used are
#		separated from the rest of the parameters with the line
#		'<!-- # Unused Parameters # -->'. It may be that the parameter
#		name has just been changed, in which case you can copy the
#		description to the parameter with the new name. You can delete
#		the unused parameter descriptions when no longer needed.
#############################################################################

use strict;
use Getopt::Long;

# Options

# name of documentation module
my $MODULE;
my $TMPL_DIR;
my $FLAG_CHANGES;

my %optctl = (module => \$MODULE,
	      'flag-changes' => \$FLAG_CHANGES,
	      'output-dir' => \$TMPL_DIR);
GetOptions(\%optctl, "module=s", "flag-changes!", "output-dir:s");

my $ROOT_DIR = ".";

# The directory containing the template files.
$TMPL_DIR = $TMPL_DIR ? $TMPL_DIR : "$ROOT_DIR/tmpl";

# This file contains the object hierarchy.
my $OBJECT_TREE_FILE = "$ROOT_DIR/$MODULE.hierarchy";

# The file containing signal handler prototype information.
my $SIGNALS_FILE = "$ROOT_DIR/$MODULE.signals";

# The file containing Arg information.
my $ARGS_FILE = "$ROOT_DIR/$MODULE.args";

# Set the flag to indicate changes, if requested.
my $CHANGES_FLAG = $FLAG_CHANGES ? "FIXME" : "";

# These global arrays store information on signals. Each signal has an entry
# in each of these arrays at the same index, like a multi-dimensional array.
my @SignalObjects;	# The GtkObject which emits the signal.
my @SignalNames;	# The signal name.
my @SignalReturns;	# The return type.
my @SignalPrototypes;	# The rest of the prototype of the signal handler.

# These global arrays store information on Args. Each Arg has an entry
# in each of these arrays at the same index, like a multi-dimensional array.
my @ArgObjects;		# The GtkObject which has the Arg.
my @ArgNames;		# The Arg name.
my @ArgTypes;		# The Arg type - gint, GtkArrowType etc.
my @ArgFlags;		# How the Arg can be used - readable/writable etc.

# These global hashes store declaration info keyed on a symbol name.
my %Declarations;
my %DeclarationTypes;
my %DeclarationConditional;
my %DeclarationOutput;

# These global hashes store the existing documentation.
my %SymbolDocs;
my %SymbolTypes;
my %SymbolParams;

# These global arrays store GtkObject and subclasses and the hierarchy.
my @Objects;
my @ObjectLevels;

&ReadSignalsFile ($SIGNALS_FILE);
&ReadArgsFile ($ARGS_FILE);
&ReadObjectHierarchy;

&ReadExistingTemplates;
&BackupExistingTemplates;
&UpdateTemplates ("$ROOT_DIR/$MODULE-sections.txt");
&OutputUnusedTemplates;
&CheckAllDeclarationsOutput;


#############################################################################
# Function    : ReadExistingTemplates
# Description : This reads in all the existing documentation, into the global
#		variables %SymbolDocs, %SymbolTypes, and %SymbolParams (a
#		hash of arrays).
# Arguments   : none
#############################################################################

sub ReadExistingTemplates {
    %SymbolDocs = ();
    %SymbolTypes = ();
    %SymbolParams = ();

    # Read the unused docs first, so they get overridden by any real docs.
    # (though this shouldn't happen often).
    my $unused_doc = "$TMPL_DIR/$MODULE-unused.sgml";
    if (-e $unused_doc) {
	&ReadTemplateFile ($unused_doc, 0);
    }

    while (<$TMPL_DIR/*.sgml>) {
#	print "Reading $_\n";
	if ($_ eq $unused_doc) {
#	    print "skipping $unused_doc\n";
	} else {
	    &ReadTemplateFile ($_, 0);
	}
    }
}


#############################################################################
# Function    : BackupExistingTemplates
# Description : This moves all existing .sgml to .sgml.bak.
# Arguments   : none
#############################################################################

sub BackupExistingTemplates {
    while (<$TMPL_DIR/*.sgml>) {
	my $backup_file = $_ . ".bak";
#	print "Backing up $_ to $backup_file\n";
	if (-e $backup_file) {
	    unlink ($backup_file)
		|| die "Can't delete old backup file: $backup_file";
	}
	rename ($_, $backup_file)
	    || die "Can't move $_ to $backup_file";
    }
}


#############################################################################
# Function    : UpdateTemplates
# Description : This collects the output for each section of the docs, and
#		outputs each file when the end of the section is found.
# Arguments   : $file - the file containing the sections of the docs.
#############################################################################

sub UpdateTemplates {
    my ($file) = @_;
#    print "Reading: $file\n";

    open (INPUT, $file)
	|| die "Can't open $file";

    # Create the top output directory if it doesn't exist.
    if (! -e $TMPL_DIR) {
	mkdir ("$TMPL_DIR", 0777)
	    || die "Can't create directory: $TMPL_DIR";
    }

    my $title = "";
    my $subsection = "";
    my $output;
    while (<INPUT>) {
	if (m/^#/) {
	    next;

	} elsif (m/^<SECTION>/) {
	    $output = "";

	} elsif (m/^<SUBSECTION\s*(.*)>/i) {
	    $subsection = $1;
	    next;

	} elsif (m/^<TITLE>(.*)<\/TITLE>/) {
	    $title = $1;
#	    print "Section: $title\n";

	    # We don't want warnings if object & class structs aren't used.
#	    $DeclarationOutput{$title} = 1;
	    $DeclarationOutput{"${title}Class"} = 1;

	} elsif (m/^<FILE>(.*)<\/FILE>/) {
	    $file = $1;

	} elsif (m/^<INCLUDE>(.*)<\/INCLUDE>/) {
	    next;

	} elsif (m/^<\/SECTION>/) {
	    if ($title eq "") {
		$title = $file;
	    }
#	    print "End of section: $title\n";

	    $file =~ s/\s/_/g;
	    $file .= ".sgml";

	    &OutputTemplateFile ($file, $title, \$output);

	    $title = "";
	    $subsection = "";

	} elsif (m/^(\S+)/) {
	    my $symbol = $1;
#	    print "  Symbol: $symbol\n";

	    my $declaration = $Declarations{$1};
	    if (defined ($declaration)) {
		# We don't want templates for standard macros/functions of
		# GtkObjects or private declarations.
		if ($subsection ne "Standard" && $subsection ne "Private") {
		    $output .= &OutputDeclaration ($DeclarationTypes {$symbol},
						   $symbol, $declaration);
		}

		# Note that the declaration has been output.
		$DeclarationOutput{$symbol} = 1;

		if ($declaration eq '##conditional##') {
#		    print "Conditional $DeclarationTypes{$symbol}\n";
		}
	    } else {
		print "WARNING: No declaration for: $1\n";
	    }
	}
    }
    close (INPUT);
}


#############################################################################
# Function    : CheckAllDeclarationsOutput
# Description : This steps through all the declarations that were loaded, and
#		makes sure that each one has been output, by checking the
#		corresponding flag in the %DeclarationOutput hash. It is
#		intended to check that any new declarations in new versions
#		of GTK/Gnome get added to the $MODULE-sections.txt file.
# Arguments   : none
#############################################################################

sub CheckAllDeclarationsOutput {
    my $num_unused = 0;
    open (UNUSED, ">$ROOT_DIR/$MODULE-unused.txt")
	|| die "Can't open $ROOT_DIR/$MODULE-unused.txt";
    my ($symbol);
    foreach $symbol (keys (%Declarations)) {
	if (!defined ($DeclarationOutput{$symbol})) {
	    print (UNUSED "$symbol\n");
	    $num_unused++;
	}
    }
    close (UNUSED);
    if ($num_unused != 0) {
	print <<EOF;
=============================================================================
WARNING: $num_unused unused declarations.
  These can be found in $MODULE-unused.txt.
  They should be added to $MODULE-sections.txt in the appropriate place.
=============================================================================
EOF
    }
}


#############################################################################
# Function    : OutputDeclaration
# Description : This returns the template for one symbol & declaration.
#		Note that it uses the global %SymbolDocs and %SymbolParams to
#		lookup any existing documentation.
# Arguments   : $type - the type of the symbol ('FUNCTION'/'MACRO' etc.)
#		$symbol - the symbol name.
#		$declaration - the declaration of the symbol.
#############################################################################

sub OutputDeclaration {
    my ($type, $symbol, $declaration) = @_;
    my ($output) = "";

#    print "Outputting $type: $symbol\n";

    # See if symbol already has a description.
    my ($symbol_desc) = $SymbolDocs{$symbol};
    my ($template_exists);
    if (defined ($symbol_desc)) {
	$template_exists = 1;
	$symbol_desc =~ s/\s+$//;
    } else {
	$template_exists = 0;
	$symbol_desc = "<para>\n$CHANGES_FLAG\n</para>";
    }

    $output .= <<EOF;
<!-- ##### $type $symbol ##### -->
$symbol_desc

EOF

    # For functions, function typedefs and macros, we output the arguments.
    # For functions and function typedefs we also output the return value.
    if ($type eq "FUNCTION" || $type eq "USER_FUNCTION") {
	# Take out the return type
	$declaration =~ s/<RETURNS>\s*(const\s+|unsigned\s+)*(\w+)\s*(\**)\s*<\/RETURNS>\n//;
	my ($ret_type) = $2;

	my ($param_num) = 0;
	my ($name);
	while ($declaration ne "") {
	    if ($declaration =~ s/^[\s,]+//) {
		# skip whitespace and commas
		next;

	    } elsif ($declaration =~ s/^void\s*[,\n]//) {
		if ($param_num != 0) {
		    print "WARNING: void used as parameter in function $symbol\n";
		}
		
	    } elsif ($declaration =~ s/^...\s*[,\n]//) {
		$output .= &OutputParam ($symbol, "Varargs",
					 $template_exists, 1, "");

		# Try to match a standard parameter.
	    } elsif ($declaration =~ s/^(const\s+|unsigned\s+)*(struct\s+)?(\w+)\s*(\**)\s*(const\s+)?(\**)?\s*(\w+)?\s*(\[\d*\])?\s*[,\n]//) {
		if (defined ($7)) {
		    $name = $7;
		} else {
		    $name = "Param" . ($param_num + 1);
		}
		$output .= &OutputParam ($symbol, $name, $template_exists, 1,
					 "");

		# Try to match parameters which are functions.
	    } elsif ($declaration =~ s/^(const\s+|unsigned\s+)*(struct\s+)?(\w+)\s*(\**)\s*(const\s+)?\(\s*\*\s*(\w+)\s*\)\s*\(([^)]*)\)\s*[,\n]//) {
	        $name = $6;
		$output .= &OutputParam ($symbol, $name, $template_exists, 1,
					 "");

	    } else {
		print "###Can't parse args for function $symbol: $declaration\n";
		last;
	    }
	    $param_num++;
	}

    
	if ($ret_type ne "void") {
	    $output .= &OutputParam ($symbol, "Returns", $template_exists, 1,
				     "");
	}
        $output .= &OutputOldParams ($symbol);
	$output .= "\n";
    }

    if ($type eq "MACRO") {
	if ($declaration =~ m/^\s*#\s*define\s+\w+\(([^\)]*)\)/) {
	    my ($param);
	    foreach $param (split (/,/, $1)) {
		$param =~ s/^\s+//;
		$param =~ s/\s*$//;
		if ($param =~ m/\S/) {
		    $output .= &OutputParam ($symbol, $param, $template_exists,
					     1, "");
		}
	    }
	}
	$output .= &OutputParam ($symbol, "Returns", $template_exists, 0, "");
	$output .= &OutputOldParams ($symbol);
	$output .= "\n";
    }

    if ($type eq "STRUCT") {
	my $is_object_struct = CheckIsObject ($symbol);
	my @fields = ParseStructDeclaration($declaration, $is_object_struct);

	for (my $i = 0; $i <= $#fields; $i += 2) {
	    my $field_name = $fields[$i];
	    $output .= &OutputParam ($symbol, $field_name, $template_exists, 1, "");
	}
    }

    if ($type eq "ENUM") {
	my @members = ParseEnumDeclaration($declaration);

	for my $member (@members) {
	    $output .= &OutputParam ($symbol, $member, $template_exists, 1, "");
	}
    }

    $output .= "\n";

    # Remove the used docs from the hashes.
    if ($template_exists) {
	delete $SymbolDocs{$symbol};
	delete $SymbolParams{$symbol};
    }

    return $output;
}


#############################################################################
# Function    : OutputParam
# Description : This outputs the part of a template for one parameter.
#		It first checks if the parameter is already described, and if
#		so it uses that description, and clears it so it isn't output
#		as an old param.
# Arguments   : $symbol - the symbol (function or macro) name.
#		$param_to_output - the parameter to add.
#		$template_exists - TRUE if the template already existed in
#		  template files. If it did, then we will flag any changes
#		  with 'FIXME'.
#		$force_output - TRUE if the parameter should be output even
#		  if it didn't already exist in the template. (The return
#		  values of macros are added manually if required, and so we
#		  never add it here - we only copy it if it already exists.)
#		$default_description - the default description of the
#		  parameter to be used if it doesn't already exist. (Signal
#		  handlers have a few common parameters.)
#############################################################################

sub OutputParam {
    my ($symbol, $param_to_output, $template_exists,
	$force_output, $default_description) = @_;
    my ($j);

    my ($params) = $SymbolParams{$symbol};
    if (defined ($params)) {
	for ($j = 0; $j <= $#$params; $j += 2) {
	    my $param_name = $$params[$j];
	    my $param_desc = $$params[$j + 1];

	    if ($param_name eq $param_to_output) {
		$param_desc =~ s/\s+$//;
		$$params[$j] = "";
		$$params[$j + 1] = "";
		return "\@$param_name: $param_desc\n";
	    }
	}
    }

    # If the template was already in a file, flag the new parameter.
    # If not, the template itself will be flagged, so we don't need to flag
    # all the new parameters as well.
    if ($force_output) {
	if ($default_description ne "") {
	    $default_description =~ s/\s+$//;
	    return "\@$param_to_output: $default_description\n";
	} else {
	    if ($template_exists) {
		return "\@$param_to_output: $CHANGES_FLAG\n";
	    } else {
		return "\@$param_to_output: \n";
	    }
	}
    }
    return "";
}


#############################################################################
# Function    : OutputOldParams
# Description : This returns all the existing documentation for parameters of
#		the given function/macro/signal symbol which are unused, with
#		a comment before them.
# Arguments   : $symbol - the symbol (function/macro/signal) name.
#############################################################################

sub OutputOldParams {
    my ($symbol) = @_;
    my $output = "";

    my ($params) = $SymbolParams{$symbol};
    if (defined ($params)) {
	my $j;
	for ($j = 0; $j <= $#$params; $j += 2) {
	    my $param_name = $$params[$j];
	    my $param_desc = $$params[$j + 1];

	    if ($param_name ne "") {
		$param_desc =~ s/\s+$//;
		$output .= "\@$param_name: $param_desc\n";
	    }
	}
    }
    if ($output) {
	$output = "<!-- # Unused Parameters # -->\n" . $output;
    }
    return $output;
}


#############################################################################
# Function    : OutputTemplateFile
# Description : This outputs one template file.
# Arguments   : $file - the basename of the file to output.
#		$title - the title from the $MODULE-sections.txt file. This
#		  will be overridden by any title given in the template file.
#		$output - reference to the templates to output.
#############################################################################

sub OutputTemplateFile {
    my ($file, $title, $output) = @_;

    my ($short_desc, $long_desc, $see_also);

    if (defined ($SymbolDocs{"$TMPL_DIR/$file:Title"})) {
	$title = $SymbolDocs{"$TMPL_DIR/$file:Title"};
	delete $SymbolDocs{"$TMPL_DIR/$file:Title"};
    }
    if (defined ($SymbolDocs{"$TMPL_DIR/$file:Short_Description"})) {
	$short_desc = $SymbolDocs{"$TMPL_DIR/$file:Short_Description"};
	delete $SymbolDocs{"$TMPL_DIR/$file:Short_Description"};
    } else {
	$short_desc = "";
    }
    if (defined ($SymbolDocs{"$TMPL_DIR/$file:Long_Description"})) {
	$long_desc = $SymbolDocs{"$TMPL_DIR/$file:Long_Description"};
	delete $SymbolDocs{"$TMPL_DIR/$file:Long_Description"};
    } else {
	$long_desc = "<para>\n\n</para>\n";
    }
    if (defined ($SymbolDocs{"$TMPL_DIR/$file:See_Also"})) {
	$see_also = $SymbolDocs{"$TMPL_DIR/$file:See_Also"};
	delete $SymbolDocs{"$TMPL_DIR/$file:See_Also"};
    } else {
	$see_also = "<para>\n\n</para>\n";
    }

    open (OUTPUT, ">$TMPL_DIR/$file")
	|| die "Can't create $TMPL_DIR/$file";

    print (OUTPUT <<EOF);
<!-- ##### SECTION Title ##### -->
$title

<!-- ##### SECTION Short_Description ##### -->
$short_desc

<!-- ##### SECTION Long_Description ##### -->
$long_desc

<!-- ##### SECTION See_Also ##### -->
$see_also

EOF

    print (OUTPUT $$output);
    &OutputSignalTemplates ($title);
    &OutputArgTemplates ($title);
    close (OUTPUT);
}


#############################################################################
# Function    : OutputSignalTemplates
# Description : Outputs templates for signal handlers.
# Arguments   : $title - the title from the $MODULE-sections.txt file. If the
#		  file is describing a GtkObject subclass, the title should
#		  be the name of the class, e.g. 'GtkButton'.
#############################################################################

sub OutputSignalTemplates {
    my ($title) = @_;

    my $output = "";
    my ($i, $template_exists);
    for ($i = 0; $i <= $#SignalObjects; $i++) {
	if ($SignalObjects[$i] eq $title) {
#	    print "Found signal: $SignalObjects[$i]\n";
	    my ($symbol) = "$SignalObjects[$i]::$SignalNames[$i]";

	    # See if symbol already has a description.
	    my ($symbol_desc) = $SymbolDocs{$symbol};
	    if (defined ($symbol_desc)) {
		$template_exists = 1;
		$symbol_desc =~ s/\s+$//;
		delete $SymbolDocs{$symbol};
	    } else {
		$template_exists = 0;
		$symbol_desc = "<para>\n$CHANGES_FLAG\n</para>";
	    }

	    $output .= <<EOF;
<!-- ##### SIGNAL $symbol ##### -->
$symbol_desc

EOF
	    
	    my @params = split ("[,\n]", $SignalPrototypes[$i]);
	    my ($j, $name);
	    for ($j = 0; $j <= $#params; $j++) {
		my $param = $params[$j];
		$param =~ s/^\s+//;
		$param =~ s/\s*$//;
		if ($param =~ m/^\s*$/) { next; }
		if ($param =~ m/^void$/) { next; }

		if ($param =~ m/^\s*(\w+)\s*(\**)\s*([\w\[\]]+)?\s*$/) {
		    if (defined($3)) {
			$name = $3;
		    } else {
			$name = "Param" . ($j + 1);
		    }
		    if ($j == 0) {
			$output .= &OutputParam ($symbol, $name,
						 $template_exists, 1,
						 "the object which received the signal.");
		    } else {
			$output .= &OutputParam ($symbol, $name,
						 $template_exists, 1, "");
		    }
		}	
	    }
	    
	    if ($SignalReturns[$i] ne "void") {
		$output .= &OutputParam ($symbol, "Returns", $template_exists,
					 1, "");
	    }
	    $output .= &OutputOldParams ($symbol);
	    $output .= "\n";
	}
    }
    print (OUTPUT $output);
}


#############################################################################
# Function    : OutputArgTemplates
# Description : Outputs templates for Args.
# Arguments   : $title - the title from the $MODULE-sections.txt file. If the
#		  file is describing a GtkObject subclass, the title should
#		  be the name of the class, e.g. 'GtkButton'.
#############################################################################

sub OutputArgTemplates {
    my ($title) = @_;

    my $output = "";
    my $i;
    for ($i = 0; $i <= $#ArgObjects; $i++) {
	if ($ArgObjects[$i] eq $title) {
#	    print "Found arg: $ArgObjects[$i]\n";
	    # I've only used one colon so we don't clash with signals.
	    my ($symbol) = "$ArgObjects[$i]:$ArgNames[$i]";

	    # See if symbol already has a description.
	    my ($symbol_desc) = $SymbolDocs{$symbol};
	    if (defined ($symbol_desc)) {
		delete $SymbolDocs{$symbol};
		$symbol_desc =~ s/\s+$//;
	    } else {
		$symbol_desc = "<para>\n$CHANGES_FLAG\n</para>";
	    }

	    $output .= <<EOF;
<!-- ##### ARG $symbol ##### -->
$symbol_desc

EOF
	}
    }
    print (OUTPUT $output);
}


#############################################################################
# Function    : OutputUnusedTemplates
# Description : This saves any unused documentation into $MODULE-unused.sgml.
# Arguments   : none
#############################################################################

sub OutputUnusedTemplates {
    my ($unused_file) = "$TMPL_DIR/$MODULE-unused.sgml";
    open (UNUSED, ">$unused_file")
	|| die "Can't open file: $unused_file";

    my $output = "";
    my ($symbol, $symbol_desc);
    while (($symbol, $symbol_desc) = each (%SymbolDocs)) {
#	print "Unused: $symbol\n";

	my $type = $SymbolTypes{$symbol};
	if (!defined ($type)) {
	    $type = "UNKNOWN";
	    print "WARNING: Unused symbol $symbol has unknown type\n";
	}

    $output .= <<EOF;
<!-- ##### $type $symbol ##### -->
$symbol_desc

EOF

	my ($params) = $SymbolParams{$symbol};
	if (defined ($params)) {
	    my $j;
	    for ($j = 0; $j <= $#$params; $j += 2) {
		my $param_name = $$params[$j];
		my $param_desc = $$params[$j + 1];
		$param_desc =~ s/\s+$//;
		$output .= "\@$param_name: $param_desc\n";
	    }
	}
	$output .= "\n";
    }

    print UNUSED $output;
    close (UNUSED);
}


#############################################################################
# LIBRARY FUNCTIONS -	These functions are used in both gtkdoc-mkdb and
#			gtkdoc-mktmpl and should eventually be moved to a
#			separate library.
#############################################################################

#############################################################################
# Function    : ReadDeclarationsFile
# Description : This reads in a file containing the function/macro/enum etc.
#		declarations.
#		
#		Note that in some cases there are several declarations with
#		the same name, e.g. for conditional macros. In this case we
#		set a flag in the %DeclarationConditional hash so the
#		declaration is not shown in the docs.
#
#		If a macro and a function have the same name, e.g. for
#		gtk_object_ref, the function declaration takes precedence.
#
#		Some opaque structs are just declared with 'typedef struct
#		_name name;' in which case the declaration may be empty.
#		The structure may have been found later in the header, so
#		that overrides the empty declaration.
#		
# Arguments   : $file - the declarations file to read
#		$override - if declarations in this file should override
#			any current declaration.
#############################################################################

sub ReadDeclarationsFile {
    my ($file, $override) = @_;

    if ($override == 0) {
	%Declarations = ();
	%DeclarationTypes = ();
	%DeclarationConditional = ();
	%DeclarationOutput = ();
    }

    open (INPUT, $file)
	|| die "Can't open $file";
    my $declaration_type = "";
    my $declaration_name;
    my $declaration;
    while (<INPUT>) {
	if (!$declaration_type) {
	    if (m/^<([^>]+)>/) {
		$declaration_type = $1;
		$declaration_name = "";
#		print "Found declaration: $declaration_type\n";
		$declaration = "";
	    }
	} else {
	    if (m%^<NAME>(.*)</NAME>%) {
		$declaration_name = $1;
	    } elsif (m%^</$declaration_type>%) {
#		print "Found end of declaration: $declaration_name\n";
		# Check that the declaration has a name
		if ($declaration_name eq "") {
		    print "ERROR: $declaration_type has no name $file:$.\n";
		}

		# Check if the symbol is already defined.
		if (defined ($Declarations{$declaration_name})
		    && $override == 0) {
		    # Function declarations take precedence.
		    if ($DeclarationTypes{$declaration_name} eq 'FUNCTION') {
			# Ignore it.
		    } elsif ($declaration_type eq 'FUNCTION') {
			$Declarations{$declaration_name} = $declaration;
			$DeclarationTypes{$declaration_name} = $declaration_type;
		    } elsif ($DeclarationTypes{$declaration_name}
			      eq $declaration_type) {
			# If the existing declaration is empty override it.
			if ($declaration_type eq 'STRUCT') {
			    if ($Declarations{$declaration_name} =~ m/^\s*$/) {
				$Declarations{$declaration_name} = $declaration;
			    } elsif ($declaration =~ m/^\s*$/) {
				# Ignore an empty declaration.
			    } else {
				print "WARNING: Structure has multiple definitions: $declaration_name\n";
			    }

			} else {
			    # set flag in %DeclarationConditional hash for
			    # multiply defined macros/typedefs.
			    $DeclarationConditional{$declaration_name} = 1;
			}
		    } else {
			print "WARNING: $declaration_name has multiple definitions\n";
		    }
		} else {
		    $Declarations{$declaration_name} = $declaration;
		    $DeclarationTypes{$declaration_name} = $declaration_type;
		}
		$declaration_type = "";
	    } else {
		$declaration .= $_;
	    }
	}
    }
    close (INPUT);
}


#############################################################################
# Function    : ReadSignalsFile
# Description : This reads in an existing file which contains information on
#		all GTK signals. It creates the arrays @SignalNames and
#		@SignalPrototypes containing info on the signals. The first
#		line of the SignalPrototype is the return type of the signal
#		handler. The remaining lines are the parameters passed to it.
#		The last parameter, "gpointer user_data" is always the same
#		so is not included.
# Arguments   : $file - the file containing the signal handler prototype
#			information.
#############################################################################

sub ReadSignalsFile {
    my ($file) = @_;

    my $in_signal = 0;
    my $signal_object;
    my $signal_name;
    my $signal_returns;
    my $signal_prototype;

    # Reset the signal info.
    @SignalObjects = ();
    @SignalNames = ();
    @SignalReturns = ();
    @SignalPrototypes = ();

    if (! -f $file) {
	return;
    }
    if (!open (INPUT, $file)) {
	warn "Can't open $file - skipping signals\n";
	return;
    }
    while (<INPUT>) {
	if (!$in_signal) {
	    if (m/^<SIGNAL>/) {
		$in_signal = 1;
		$signal_object = "";
		$signal_name = "";
		$signal_returns = "";
		$signal_prototype = "";
	    }
	} else {
	    if (m/^<NAME>(.*)<\/NAME>/) {
		$signal_name = $1;
		if ($signal_name =~ m/^(.*)::(.*)$/) {
		    $signal_object = $1;
		    $signal_name = $2;
#		    print "Found signal: $signal_name\n";
		} else {
		    print "Invalid signal name: $signal_name\n";
		}
	    } elsif (m/^<RETURNS>(.*)<\/RETURNS>/) {
		$signal_returns = $1;
	    } elsif (m%^</SIGNAL>%) {
#		print "Found end of signal: ${signal_object}::${signal_name}\nReturns: ${signal_returns}\n${signal_prototype}";
		push (@SignalObjects, $signal_object);
		push (@SignalNames, $signal_name);
		push (@SignalReturns, $signal_returns);
	        push (@SignalPrototypes, $signal_prototype);
		$in_signal = 0;
	    } else {
		$signal_prototype .= $_;
	    }
	}
    }
    close (INPUT);
}


#############################################################################
# Function    : ReadTemplateFile
# Description : This reads in the manually-edited documentation file
#		corresponding to the file currently being created, so we can
#		insert the documentation at the appropriate places.
#		It outputs %SymbolTypes, %SymbolDocs and %SymbolParams, which
#		is a hash of arrays.
#		NOTE: This function is duplicated in gtkdoc-mkdb (but
#		slightly different).
# Arguments   : $docsfile - the template file to read in.
#		$skip_unused_params - 1 if the unused parameters should be
#			skipped.
#############################################################################

sub ReadTemplateFile {
    my ($docsfile, $skip_unused_params) = @_;

#    print "Reading $docsfile\n";
    if (! -f $docsfile) {
	print "File doesn't exist: $docsfile\n";
	return; 
    }

    my $CurrentType = "";	# Type of symbol being read.
    my $CurrentSymbol = "";	# Name of symbol being read.
    my $SymbolDoc = "";		# Description of symbol being read.
    my @Params;			# Parameter names and descriptions of current
				#   function/macro/function typedef.
    my $CurrentParam = -1;	# Index of parameter currently being read.
				#   Note that the param array contains pairs
				#   of param name & description.
    my $InUnusedParameters = 0;	# True if we are reading in the unused params.

    open (DOCS, $docsfile)
	|| die "Can't open file $docsfile: $!";
    while (<DOCS>) {
	if (m/^<!-- ##### ([A-Z_]+) (\S+) ##### -->/) {
	    my $type = $1;
	    my $symbol = $2;
	    if ($symbol eq "Title"
		|| $symbol eq "Short_Description"
		|| $symbol eq "Long_Description"
		|| $symbol eq "See_Also") {
		$symbol = $docsfile . ":" . $symbol;
#		print "Found symbol: $symbol\n";
	    }

	    # Store previous symbol, but remove any trailing blank lines.
	    if ($CurrentSymbol ne "") {
		$SymbolDoc =~ s/\s+$//;
		$SymbolTypes{$CurrentSymbol} = $CurrentType;
		$SymbolDocs{$CurrentSymbol} = $SymbolDoc;
		if ($CurrentParam >= 0) {
		    $SymbolParams{$CurrentSymbol} = [ @Params ];
		} else {
		    # Delete any existing params in case we are overriding a
		    # previously read template.
		    delete $SymbolParams{$CurrentSymbol};
		}
	    }
	    $CurrentType = $type;
	    $CurrentSymbol = $symbol;
	    $CurrentParam = -1;
	    $InUnusedParameters = 0;
	    $SymbolDoc = "";
	    @Params = ();

	} elsif (m/^<!-- # Unused Parameters # -->/) {
	    $InUnusedParameters = 1;
	    next;

	} else {
	    # Check if param found
	    if (s/^\@(\S+):\s*//) {
		my $param_name = $1;
		# Allow variations of 'Returns'
		if ($param_name =~ m/^[Rr]eturns?$/) {
		    $param_name = "Returns";
		}
#		print "Found param: $param_name\n";
		push (@Params, $param_name);
		push (@Params, $_);
		$CurrentParam += 2;
		next;
	    }

	    # When outputting the DocBook we skip unused parameters.
	    if (!$InUnusedParameters || !$skip_unused_params) {
		if ($CurrentParam >= 0) {
		    $Params[$CurrentParam] .= $_;
		} else {
		    $SymbolDoc .= $_;
		}
	    }
	}
    }

    # Remember to finish the current symbol doccs.
    if ($CurrentSymbol ne "") {
	$SymbolDoc =~ s/\s+$//;
	$SymbolTypes{$CurrentSymbol} = $CurrentType;
	$SymbolDocs{$CurrentSymbol} = $SymbolDoc;
	if ($CurrentParam >= 0) {
	    $SymbolParams{$CurrentSymbol} = [ @Params ];
	} else {
	    delete $SymbolParams{$CurrentSymbol};
	}
    }

    close (DOCS);
}


#############################################################################
# Function    : ReadObjectHierarchy
# Description : This reads in the $MODULE-hierarchy.txt file containing all
#		the GtkObject subclasses described in this module (and their
#		ancestors).
#		It places them in the @Objects array, and places their level
#		in the widget hierarchy in the @ObjectLevels array, at the
#		same index. GtkObject, the root object, has a level of 1.
#   
#               FIXME: the version in gtkdoc-mkdb also generates tree_index.sgml
#               as it goes along, this should be split out into a separate
#               function.
# 
# Arguments   : none
#############################################################################

sub ReadObjectHierarchy {
    @Objects = ();
    @ObjectLevels = ();

    if (! -f $OBJECT_TREE_FILE) {
	return;
    }
    if (!open (INPUT, $OBJECT_TREE_FILE)) {
	warn "Can't open $OBJECT_TREE_FILE - skipping object tree\n";
	return;
    }
    while (<INPUT>) {
        if (m/\S+/) {
	    my $object = $&;
	    my $level = (length($`)) / 2 + 1;
#            print ("Level: $level  Object: $object\n");

	    push (@Objects, $object);
	    push (@ObjectLevels, $level);
        }
    }

    close (INPUT);
}


#############################################################################
# Function    : ReadArgsFile
# Description : This reads in an existing file which contains information on
#		all GTK args. It creates the arrays @ArgObjects, @ArgNames,
#		@ArgTypes and @ArgFlags containing info on the args.
# Arguments   : $file - the file containing the arg information.
#############################################################################

sub ReadArgsFile {
    my ($file) = @_;

    my $in_arg = 0;
    my $arg_object;
    my $arg_name;
    my $arg_type;
    my $arg_flags;

    # Reset the signal info.
    @ArgObjects = ();
    @ArgNames = ();
    @ArgTypes = ();
    @ArgFlags = ();

    if (! -f $file) {
	return;
    }
    if (!open (INPUT, $file)) {
	warn "Can't open $file - skipping args\n";
	return;
    }
    while (<INPUT>) {
	if (!$in_arg) {
	    if (m/^<ARG>/) {
		$in_arg = 1;
		$arg_object = "";
		$arg_name = "";
		$arg_type = "";
		$arg_flags = "";
	    }
	} else {
	    if (m/^<NAME>(.*)<\/NAME>/) {
		$arg_name = $1;
		if ($arg_name =~ m/^(.*)::(.*)$/) {
		    $arg_object = $1;
		    $arg_name = $2;
#		    print "Found arg: $arg_name\n";
		} else {
		    print "Invalid arg name: $arg_name\n";
		}
	    } elsif (m/^<TYPE>(.*)<\/TYPE>/) {
		$arg_type = $1;
	    } elsif (m/^<FLAGS>(.*)<\/FLAGS>/) {
		$arg_flags = $1;
	    } elsif (m%^</ARG>%) {
#		print "Found end of arg: ${arg_object}::${arg_name}\n${arg_type} : ${arg_flags}\n";
		push (@ArgObjects, $arg_object);
		push (@ArgNames, $arg_name);
		push (@ArgTypes, $arg_type);
		push (@ArgFlags, $arg_flags);
		$in_arg = 0;
	    }
	}
    }
    close (INPUT);
}


#############################################################################
# Function    : CheckIsObject
# Description : Returns 1 if the given name is a GtkObject or a subclass.
#		It uses the global @Objects array.
#		Note that the @Objects array only contains classes in the
#		current module and their ancestors - not all GTK classes.
# Arguments   : $name - the name to check.
#############################################################################

sub CheckIsObject {
    my ($name) = @_;

    my $object;
    foreach $object (@Objects) {
	if ($object eq $name) {
	    return 1;
	}
    }
    return 0;
}


#############################################################################
# Function    : ParseStructDeclaration
# Description : This function takes a structure declaration and
#               breaks it into individual type declarations.
# Arguments   : $declaration - the declaration to parse
#               $is_object - true if this is an object structure
#               $typefunc - function reference to apply to type
#               $namefunc - function reference to apply to name
#############################################################################

sub ParseStructDeclaration {
    my ($declaration, $is_object, $typefunc, $namefunc) = @_;

    # Remove all private parts of the declaration

    # For objects, assume private
    if ($is_object) {
	$declaration =~ s!(struct\s+\w*\s*\{)
	                  .*?
			  (?:/\*\s*<\s*public\s*>\s*\*/|(?=\}))!$1!msgx;
    }
    
    $declaration =~ s!\n?[ \t]*/\*\s*<\s*private\s*>\s*\*/
	              .*?
		      (?:/\*\s*<\s*public\s*>\s*\*/|(?=\}))!!msgx;
    
    # Remove all other comments;
    $declaration =~ s@/\*([^*]+|\*(?!/))*\*/@ @g;

    my @result = ();

    if ($declaration =~ /^\s*$/) {
	return @result;
    }

    # Prime match after "struct {" declaration
    if (!scalar($declaration =~ m/struct\s+\w*\s*\{/msg)) {
	die "Structure declaration '$declaration' does not begin with struct [NAME] {\n";
    }

    # Treat lines in sequence, allowing singly nested anonymous structs
    # and unions.
    while ($declaration =~ m/\s*([^{;]+(\{[^\}]*\}[^{;]+)?);/msg) {
	my $line = $1;
	
	last if $line =~ /^\s*\}\s*\w*\s*$/;

	# FIXME: Just ignore nested structs and unions for now
	next if $line =~ /{/;

	# FIXME: The regexes here are the same as in OutputFunction; 
	#        this functionality should be separated out.

	if ($line =~ m/^
	    (const\s+|unsigned\s+)*(struct\s+)? # mod1
	    (\w+)\s*                            # type
	    (\**)\s*                            # ptr1
	    (const\s+)?                         # mod2
	    (\**)?\s*                           # ptr2
	    (\w+(?:\s*,\s*\w+)*)\s*             # name
	    (?:((?:\[[^\]]*\]\s*)+) |           # array
	       (:\s*\d+))?\s*                   # bits
	               $/x) {
	    my $mod1 = defined($1) ? $1 : "";
	    if (defined($2)) { $mod1 .= $2; }
	    my $type = $3;
	    my $ptr1 = $4;
	    my $mod2 = defined($5) ? $5 : "";
	    my $ptr2 = $6;
	    my $name = $7;
	    $ptr1 = " " . $ptr1;
	    my $array = defined($8) ? $8 : "";
	    my $bits =  defined($9) ? " $9" : "";
	    my $ptype = defined $typefunc ? $typefunc->($type) : $type;
	    
	    # FIXME:
	    # As a hack, we allow the "name" to be of the form
	    # "a, b, c". This isn't the correct C syntax, but
	    # at least we get "gint16 x, y" right. Such constructs
	    # should really be completely removed from the source.
	    # Or we should really try to understand the C syntax
	    # here...
	    
	    my @names = split /\s*,\s*/, $name;
	    for my $n (@names) {
		push @result, $n;
		if (defined $namefunc) {
		    $n = $namefunc->($n);
		}
		push @result, "$mod1$ptype$ptr1$mod2$ptr2$n$array$bits";
	    }
	    
        # Try to match structure members which are functions
	} elsif ($line =~ m/^
		 (const\s+|unsigned\s+)*(struct\s+)?  # mod1 
		 (\w+)\s*                             # type
		 (\**)\s*                             # ptr1
		 (const\s+)?                          # mod2
		 \(\s*\*\s*(\w+)\s*\)\s*              # name
		 \(([^)]*)\)\s*                       # func_params
		            $/x) {

	    my $mod1 = defined($1) ? $1 : "";
	    if (defined($2)) { $mod1 .= $2; }
	    my $type = $3;
	    my $ptr1 = $4;
	    my $mod2 = defined($5) ? $5 : "";
	    my $name = $6;
	    my $func_params = $7;
	    my $ptype = defined $typefunc ? $typefunc->($type) : $type;
	    my $pname = defined $namefunc ? $namefunc->($name) : $name;
	    
	    push @result, $name;
	    push @result, "$mod1$ptype$ptr1$mod2 (*$pname) ($func_params)";
	    
	} else {
	    warn "Cannot parse structure field $line";
	}
    }
    
    return @result;
}


#############################################################################
# Function    : ParseEnumDeclaration
# Description : This function takes a enumeration declaration and
#               breaks it into individual enum member declarations.
# Arguments   : $declaration - the declaration to parse
#############################################################################

sub ParseEnumDeclaration {
    my ($declaration, $is_object) = @_;

    # Remove comments;
    $declaration =~ s@/\*([^*]+|\*(?!/))*\*/@ @g;

    my @result = ();

    if ($declaration =~ /^\s*$/) {
	return @result;
    }

    # Remove parenthesized expressions (in macros like GTK_BLAH = BLAH(1,3))
    # to avoid getting confused by commas they might contain. This
    # doesn't handle nested parentheses correctly.

    $declaration =~ s/\([^)]*\)//g;

    # Prime match after "typedef enum {" declaration
    if (!scalar($declaration =~ m/typedef\s+enum\s*\{/msg)) {
	die "Enum declaration '$declaration' does not begin with typedef enum {\n";
    }

    # Treat lines in sequence.
    while ($declaration =~ m/\s*([^,\}]+)([,\}])/msg) {
	my $line = $1;
	my $terminator = $2;

	if ($line =~ m/^(\w+)\s*(=.*)?$/msg) {
	    push @result, $1;
	    
	# Special case for GIOCondition, where the values are specified by
	# macros which expand to include the equal sign like '=1'.
	} elsif ($line =~ m/^(\w+)\s*GLIB_SYSDEF_POLL/msg) {
	    push @result, $1;
	    
	# Special case include of <gdk/gdkcursors.h>, just ignore it
	} elsif ($line =~ m/^#include/) {
	    last;

	} else {
	    warn "Cannot parse enumeration member $line";
	}

	last if $terminator eq '}';
    }
    
    return @result;
}