#!/usr/bin/perl -w
# -*- cperl -*-
#
# 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
#

#
# This gets information about object heirarchies and signals
# by compiling a small C program. CFLAGS and LDFLAGS must be
# set appropriately before running this script.
#

use Getopt::Long;

push @INC, '/usr/share/gtk-doc/data';
require "gtkdoc-common.pl";

# Options

# name of documentation module
my $MODULE;
my $OUTPUT_DIR;
my $PRINT_VERSION;

%optctl = (module => \$MODULE,
           types => \$TYPES_FILE,
           nogtkinit => \$NO_GTK_INIT,
           'output-dir' => \$OUTPUT_DIR,
           'version' => \$PRINT_VERSION,
           'help' => \$PRINT_HELP);

GetOptions(\%optctl, "module=s", "types:s", "output-dir:s", "nogtkinit", "version", "help");

if ($PRINT_VERSION) {
    print "1.18\n";
    exit 0;
}

if (!$MODULE) {
    $PRINT_HELP = 1;
}

if ($PRINT_HELP) {
    print <<EOF;
gtkdoc-scanobj version 1.18 - introspect gtk-objects

--module=MODULE_NAME          Name of the doc module being parsed
--types=FILE                  The name of the file to store the types in
--output-dir=DIRNAME          The directory where the results are stored
--version                     Print the version of this program
--help                        Print this help
EOF
    exit 0;
}

$OUTPUT_DIR = $OUTPUT_DIR ? $OUTPUT_DIR : ".";

$TYPES_FILE = $TYPES_FILE ? $TYPES_FILE : "$OUTPUT_DIR/$MODULE.types";

open (TYPES, $TYPES_FILE) || die "Cannot open $TYPES_FILE: $!\n";
open (OUTPUT, ">$MODULE-scan.c") || die "Cannot open $MODULE-scan.c: $!\n";

my $old_signals_filename = "$OUTPUT_DIR/$MODULE.signals";
my $new_signals_filename = "$OUTPUT_DIR/$MODULE.signals.new";
my $old_hierarchy_filename = "$OUTPUT_DIR/$MODULE.hierarchy";
my $new_hierarchy_filename = "$OUTPUT_DIR/$MODULE.hierarchy.new";
my $old_args_filename = "$OUTPUT_DIR/$MODULE.args";
my $new_args_filename = "$OUTPUT_DIR/$MODULE.args.new";

# write a C program to scan the types

$includes = "";
@types = ();

for (<TYPES>) {
    if (/^#include/) {
        $includes .= $_;
    } elsif (/^%/) {
        next;
    } elsif (/^\s*$/) {
        next;
    } else {
        chomp;
        push @types, $_;
    }
}

$ntypes = @types + 1;

print OUTPUT <<EOT;
#include <string.h>
#include <stdlib.h>
#include <stdio.h>
#include <errno.h>

$includes
GtkType object_types[$ntypes];

GtkType *
get_object_types (void)
{
    gint i = 0;
EOT

for (@types) {
    print OUTPUT "    object_types[i++] = $_ ();\n";
}

print OUTPUT <<EOT;
    object_types[i] = 0;

    return object_types;
}

/*
 * This uses GTK type functions to output signal prototypes and the widget
 * hierarchy.
 */

/* The output files */
gchar *signals_filename = "$new_signals_filename";
gchar *hierarchy_filename = "$new_hierarchy_filename";
gchar *args_filename = "$new_args_filename";


static void output_signals (void);
static void output_widget_signals (FILE *fp,
                                   GtkType object_type);
static void output_widget_signal (FILE *fp,
                                  GtkType object_type,
                                  gchar *object_class_name,
                                  guint signal_id);
static gchar * get_type_name (GtkType type,
                              gboolean * is_pointer);
static void output_widget_hierarchy (void);
static void output_hierarchy (FILE *fp,
                              GtkType type,
                              guint level);

static void output_args (void);
static void output_widget_args (FILE *fp, GtkType object_type);

int
main (int argc, char *argv[])
{
EOT

  if ($NO_GTK_INIT) {
    print OUTPUT <<EOT;
  gtk_type_init ();
EOT
  } else {
    print OUTPUT <<EOT;
  gtk_init (&argc, &argv);
EOT
  }

print OUTPUT <<EOT;
  get_object_types ();

  output_signals ();
  output_widget_hierarchy ();
  output_args ();

  return 0;
}


static void
output_signals (void)
{
  FILE *fp;
  gint i;

  fp = fopen (signals_filename, "w");
  if (fp == NULL)
    {
      g_warning ("Couldn't open output file: %s : %s", signals_filename, g_strerror(errno));
      return;
    }

  for (i = 0; object_types[i]; i++)
    output_widget_signals (fp, object_types[i]);

  fclose (fp);
}


/* This outputs all the signals of one widget. */
static void
output_widget_signals (FILE *fp, GtkType object_type)
{
  GtkObjectClass *class;
  gchar *object_class_name;
  guint sig;

  class = gtk_type_class (object_type);
  if (!class || class->nsignals == 0)
    return;

  object_class_name = gtk_type_name (object_type);

  for (sig = 0; sig < class->nsignals; sig++)
    {
      if (!class->signals[sig])
        {
          /*g_print ("Signal slot [%u] is empty\\n", sig);*/
          continue;
        }

      output_widget_signal (fp, object_type, object_class_name,
                            class->signals[sig]);
    }
}


/* This outputs one signal. */
static void
output_widget_signal (FILE *fp,
                      GtkType object_type,
                      gchar *object_name,
                      guint signal_id)
{
  GtkSignalQuery *query_info;
  gchar *ret_type, *pos, *type_name, *arg_name, *object_arg, *object_arg_start;
  gboolean is_pointer;
  gchar buffer[1024];
  guint i, param;
  gint param_num, widget_num, event_num, callback_num;
  gint *arg_num;
  gchar signal_name[128];

  /*  g_print ("Object: %s Type: %i Signal: %u\\n", object_name, object_type,
      signal_id);*/

  param_num = 1;
  widget_num = event_num = callback_num = 0;

  query_info = gtk_signal_query (signal_id);
  if (query_info == NULL)
    {
      g_warning ("Couldn't query signal");
      return;
    }

  /* Output the signal object type and the argument name. We assume the
     type is a pointer - I think that is OK. We remove "Gtk" or "Gnome" and
     convert to lower case for the argument name. */
  pos = buffer;
  sprintf (pos, "%s ", object_name);
  pos += strlen (pos);

  /* Try to come up with a sensible variable name for the first arg
   * I chops off 2 know prefixes :/ and makes the name lowercase
   * It should replace lowercase -> uppercase with '_'
   * see gtkdoc-scangobject.in for better algorithm
   */
  if (!strncmp (object_name, "Gtk", 3))
      object_arg = object_name + 3;
  else if (!strncmp (object_name, "Gnome", 5))
      object_arg = object_name + 5;
  else
      object_arg = object_name;

  object_arg_start = pos;
  sprintf (pos, "*%s\\n", object_arg);
  pos += strlen (pos);
  g_strdown (object_arg_start);
  if (!strcmp (object_arg_start, "widget"))
    widget_num++;

  /* Convert signal name to use underscores rather than dashes '-'. */
  strncpy (signal_name, query_info->signal_name, 127);
  signal_name[127] = '\\0';
  for (i = 0; signal_name[i]; i++)
    {
      if (signal_name[i] == '-')
        signal_name[i] = '_';
    }

  /* Output the signal parameters. */
  for (param = 0; param < query_info->nparams; param++)
    {
      type_name = get_type_name (query_info->params[param], &is_pointer);

      /* Most arguments to the callback are called "arg1", "arg2", etc.
         GtkWidgets are called "widget", "widget2", ...
         GtkCallbacks are called "callback", "callback2", ... */
      if (!strcmp (type_name, "GtkWidget"))
        {
          arg_name = "widget";
          arg_num = &widget_num;
        }
      else if (!strcmp (type_name, "GtkCallback")
               || !strcmp (type_name, "GtkCCallback"))
        {
          arg_name = "callback";
          arg_num = &callback_num;
        }
      else
        {
          arg_name = "arg";
          arg_num = &param_num;
        }
      sprintf (pos, "%s ", type_name);
      pos += strlen (pos);

      if (!arg_num || *arg_num == 0)
        sprintf (pos, "%s%s\\n", is_pointer ? "*" : " ", arg_name);
      else
        sprintf (pos, "%s%s%i\\n", is_pointer ? "*" : " ", arg_name,
                 *arg_num);
          pos += strlen (pos);

          if (arg_num)
            *arg_num += 1;
    }

  /* Output the return type and function name. */
  ret_type = get_type_name (query_info->return_val, &is_pointer);

  fprintf (fp,
           "<SIGNAL>\\n<NAME>%s::%s</NAME>\\n<RETURNS>%s%s</RETURNS>\\n%s</SIGNAL>\\n\\n",
           object_name, query_info->signal_name, ret_type, is_pointer ? "*" : "", buffer);
  g_free (query_info);
}


/* Returns the type name to use for a signal argument or return value, given
   the GtkType from the signal info. It also sets is_pointer to TRUE if the
   argument needs a '*' since it is a pointer. */
static gchar *
get_type_name (GtkType type, gboolean * is_pointer)
{
  gchar *type_name;

  *is_pointer = FALSE;
  type_name = gtk_type_name (type);

  switch (type) {
  case GTK_TYPE_NONE:
  case GTK_TYPE_CHAR:
  case GTK_TYPE_UCHAR:
  case GTK_TYPE_BOOL:
  case GTK_TYPE_INT:
  case GTK_TYPE_UINT:
  case GTK_TYPE_LONG:
  case GTK_TYPE_ULONG:
  case GTK_TYPE_FLOAT:
  case GTK_TYPE_DOUBLE:
  case GTK_TYPE_POINTER:
    /* These all have normal C type names so they are OK. */
    return type_name;

  case GTK_TYPE_STRING:
    /* A GtkString is really a gchar*. */
    *is_pointer = TRUE;
    return "gchar";

  case GTK_TYPE_ENUM:
  case GTK_TYPE_FLAGS:
    /* We use a gint for both of these. Hopefully a subtype with a decent
       name will be registered and used instead, as GTK+ does itself. */
    return "gint";

  case GTK_TYPE_BOXED:
    /* A boxed value is just an opaque pointer, I think. */
    return "gpointer";

  case GTK_TYPE_SIGNAL:
  case GTK_TYPE_ARGS:
  case GTK_TYPE_FOREIGN:
  case GTK_TYPE_CALLBACK:
  case GTK_TYPE_C_CALLBACK:
    /* FIXME: These are wrong. I think they expand into more than 1 argument.
       See the GtkArg struct in gtktypeutils.h and gtkargcollector.c.
       Fortunately I doubt anything uses these as signal args. */
    return "gpointer";

  default:
    break;
  }

  /* For all GtkObject subclasses we can use the class name with a "*",
     e.g. 'GtkWidget *'. */
  if (gtk_type_is_a (type, GTK_TYPE_OBJECT))
    *is_pointer = TRUE;

  return type_name;
}


/* This outputs the hierarchy of all widgets which have been initialized,
   i.e. by calling their XXX_get_type() initialization function. */
static void
output_widget_hierarchy (void)
{
  FILE *fp;

  fp = fopen (hierarchy_filename, "w");
  if (fp == NULL)
    {
      g_warning ("Couldn't open output file: %s : %s", hierarchy_filename, g_strerror(errno));
      return;
    }
  output_hierarchy (fp, GTK_TYPE_OBJECT, 0);
  fclose (fp);
}


/* This is called recursively to output the hierarchy of a widget. */
static void
output_hierarchy (FILE *fp,
                  GtkType type,
                  guint level)
{
  GList *list;
  guint i;

  if (!type)
    return;

  for (i = 0; i < level; i++)
    fprintf (fp, "  ");
  fprintf (fp, "%s\\n", gtk_type_name (type));

  list = gtk_type_children_types (type);

  while (list)
    {
      GtkType child = (GtkType) list->data;
      output_hierarchy (fp, child, level + 1);
      list = list->next;
    }
}


static void
output_args (void)
{
  FILE *fp;
  gint i;

  fp = fopen (args_filename, "w");
  if (fp == NULL)
    {
      g_warning ("Couldn't open output file: %s : %s", args_filename, g_strerror(errno));
      return;
    }

  for (i = 0; object_types[i]; i++)
    output_widget_args (fp, object_types[i]);

  fclose (fp);
}


static void
output_widget_args (FILE *fp, GtkType object_type)
{
  GtkObjectClass *class;
  gchar *object_class_name;
  GtkArg *args;
  guint32 *arg_flags;
  guint n_args;
  guint arg;
  gchar flags[16], *pos;

  class = gtk_type_class (object_type);
  if (!class)
    return;

  object_class_name = gtk_type_name (object_type);

  args = gtk_object_query_args (class->type, &arg_flags, &n_args);

  for (arg = 0; arg < n_args; arg++)
    {
      pos = flags;
      /* We use one-character flags for simplicity. */
      if (arg_flags[arg] & GTK_ARG_READABLE)
        *pos++ = 'r';
      if (arg_flags[arg] & GTK_ARG_WRITABLE)
        *pos++ = 'w';
      if (arg_flags[arg] & GTK_ARG_CONSTRUCT)
        *pos++ = 'x';
      if (arg_flags[arg] & GTK_ARG_CONSTRUCT_ONLY)
        *pos++ = 'X';
      if (arg_flags[arg] & GTK_ARG_CHILD_ARG)
        *pos++ = 'c';
      *pos = 0;

      fprintf (fp, "<ARG>\\n<NAME>%s</NAME>\\n<TYPE>%s</TYPE>\\n<FLAGS>%s</FLAGS>\\n</ARG>\\n\\n",
               args[arg].name, gtk_type_name (args[arg].type), flags);
    }

  g_free (args);
  g_free (arg_flags);
}
EOT

close OUTPUT;

# Compile and run our file

$CC = $ENV{CC} ? $ENV{CC} : "gcc";
$LD = $ENV{LD} ? $ENV{LD} : $CC;
$CFLAGS = $ENV{CFLAGS} ? $ENV{CFLAGS} : "";
$LDFLAGS = $ENV{LDFLAGS} ? $ENV{LDFLAGS} : "";
$RUN = $ENV{RUN} ? $ENV{RUN} : "";

my $o_file;
if ($CC =~ /libtool/) {
  $o_file  = "$MODULE-scan.lo"
} else {
  $o_file = "$MODULE-scan.o"
}

# Compiling scanner
$command = "$CC $CFLAGS -c -o $o_file $MODULE-scan.c";
system("($command)") == 0 or die "Compilation of scanner failed: $!\n";

# Linking scanner
# FIXME: Can we turn off as-needed for the docs (or better fix it?)
#$command = "$LD -Wl,--no-as-needed $o_file $LDFLAGS -o $MODULE-scan";
$command = "$LD $o_file $LDFLAGS -o $MODULE-scan";
system("($command)") == 0 or die "Linking of scanner failed: $!\n";

# Running scanner $MODULE-scan ";
system("($RUN ./$MODULE-scan)") == 0 or die "Scan failed: $!\n";

if (!defined($ENV{"GTK_DOC_KEEP_INTERMEDIATE"})) {
  unlink "./$MODULE-scan.c", "./$MODULE-scan.o", "./$MODULE-scan.lo", "./$MODULE-scan";
}

&UpdateFileIfChanged ($old_signals_filename, $new_signals_filename, 0);
&UpdateFileIfChanged ($old_hierarchy_filename, $new_hierarchy_filename, 0);
&UpdateFileIfChanged ($old_args_filename, $new_args_filename, 0);

