# gtkmm - GtkDefs module
#
# Copyright 2001 Free Software Foundation
#
# 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.
#
package GtkDefs;
use strict;
use warnings;
use open IO => ":utf8";

use Util;
use Enum;
use Object;
use Property;
use FunctionBase;

#
#  Public functions
#    read_defs(path, file)
#
#    @ get_methods()
#    @ get_signals()
#    @ get_properties()
#    @ get_unwrapped()
#
#    $ lookup_enum(c_type)
#    $ lookup_object(c_name)
#    $ lookup_method_dont_mark(c_name)
#    $ lookup_method_set_weak_mark(c_name)
#    $ lookup_method(c_name)
#    $ lookup_function(c_name)
#    $ lookup_property(object, c_name)
#    $ lookup_signal(object, c_name)
#

BEGIN {
     use Exporter   ();
     our ($VERSION, @ISA, @EXPORT, @EXPORT_OK, %EXPORT_TAGS);

     # set the version for version checking
     $VERSION     = 1.00;

     @ISA         = qw(Exporter);
     @EXPORT      = ( );
     %EXPORT_TAGS = ( );

     # your exported package globals go here,
#    # as well as any optionally exported functions
     @EXPORT_OK   = ( );
}
our @EXPORT_OK;

#####################################

use strict;
use warnings;

#####################################

%GtkDefs::enums = (); #Enum
%GtkDefs::objects = (); #Object
%GtkDefs::methods = (); #GtkDefs::Function
%GtkDefs::signals = (); #GtkDefs::Signal
%GtkDefs::properties = (); #Property

@GtkDefs::read = ();
@GtkDefs::file = ();


#####################################
#prototype to get rid of warning
sub read_defs($$;$);

sub read_defs($$;$)
{
  my ($path, $filename, $restrict) = @_;
  $restrict = "" if ($#_ < 2);

  # check that the file is there.
  if ( ! -r "$path/$filename")
  {
     print "Error: can't read defs file $filename\n";
     return;
  }

  # break the tokens into lisp phrases up to three levels deep.
  #   WARNING: reading the following perl statement may induce seizures,
  #   please flush eyes with water immediately, and consult a mortician.
  #
  # this regexp is weak - it does not work on multiple and/or unpaired parens
  # inside double quotes - those shouldn't be ever considered. i replaced this
  # splitting with my own function, which does the job very well - krnowak.
#  my @tokens = split(
#    m/(
#        \(
#        (?:
#            [^()]*
#            \(
#            (?:
#                [^()]*
#                \(
#                [^()]*
#                \)
#            )*
#            [^()]*
#            \)
#        )*
#        [^()]*
#        \)
#    )/x,
#    read_file($path, $filename));

  my @tokens = split_tokens(read_file($path, $filename));

  # scan through top level tokens
  while ($#tokens > -1)
  {
    my $token = shift @tokens;
    next if ($token =~ /^\s*$/);

    if ($token =~ /\(include (\S+)\)/)
    {
      read_defs($path,$1,$restrict);
      next;
    }
    elsif ($token =~ /^\(define-flags-extended.*\)$/)
    { on_enum($token); }
    elsif ($token =~ /^\(define-enum-extended.*\)$/)
    { on_enum($token); }
    elsif ($token =~ /^\(define-flags.*\)$/)
    { }
    elsif ($token =~ /^\(define-enum.*\)$/)
    { }
    elsif ($token =~ /^\(define-object.*\)$/)
    { on_object($token); }
    elsif ($token =~ /^\(define-function.*\)$/)
    { on_function($token); }
    elsif ($token =~ /^\(define-method.*\)$/)
    { on_method($token); }
    elsif ($token =~ /^\(define-property.*\)$/)
    { on_property($token); }
    elsif ($token =~ /^\(define-signal.*\)$/)
    { on_signal($token);  }
    elsif ($token =~ /^\(define-vfunc.*\)$/)
    { on_vfunc($token); }
    else
    {
      if ( $token =~ /^\(define-(\S+) (\S+)/)
      {
        # FIXME need to figure out the line number.
        print STDERR "Broken lisp definition for $1 $2.\n";
      }
      else
      {
        print "unknown token $token \n";
      }
    }
  }
}

sub split_tokens($)
{
  my ($token_string) = @_;
  my @tokens = ();
  # whether we are inside double quotes.
  my $inside_dquotes = 0;
  # whether we are inside double and then single quotes (for situations like
  # "'"'").
  my $inside_squotes = 0;
  # number of yet unpaired opening parens.
  my $parens = 0;
  # whether previous char was a backslash - important only when being between
  # double quotes.
  my $backslash = 0;
  # index of first opening paren - beginning of a new token.
  my $begin_token = 0;

  # Isolate characters with special significance for the token split.
  my @substrings = split(/([\\"'()])/, $token_string);

  my $index = -1;
  for my $substring (@substrings)
  {
    $index++;
    # if we are inside double quotes.
    if ($inside_dquotes)
    {
      # if prevous char was backslash, then current char is not important -
      # we are still inside double or double/single quotes anyway.
      if ($backslash)
      {
        $backslash = 0;
      }
      # if current char is backslash.
      elsif ($substring eq '\\')
      {
        $backslash = 1;
      }
      # if current char is unescaped double quotes and we are not inside single
      # ones - means, we are going outside string.
      elsif ($substring eq '"' and not $inside_squotes)
      {
        $inside_dquotes = 0;
      }
      # if current char is unescaped single quote, then we have two cases:
      # 1. it just plain apostrophe.
      # 2. it is a piece of a C code:
      #  a) opening quotes,
      #  b) closing quotes.
      # if there is near (2 or 3 indexes away) second quote, then it is 2a,
      # if 2a occured earlier, then it is 2b.
      # otherwise is 1.
      elsif ($substring eq '\'')
      {
        # if we are already inside single quotes, it is 2b.
        if ($inside_squotes)
        {
          $inside_squotes = 0;
        }
        else
        {
          # if there is closing quotes near, it is 2a.
          if (join('', @substrings[$index .. min($#substrings, $index+3)]) =~ /^'\\?.'/)
          {
            $inside_squotes = 1;
          }
          # else it is just 1.
        }
      }
    }
    # double quotes - beginning of a string.
    elsif ($substring eq '"')
    {
      $inside_dquotes = 1;
    }
    # opening paren - if paren count is 0 then this is a beginning of a token.
    elsif ($substring eq '(')
    {
      unless ($parens)
      {
        $begin_token = $index;
      }
      $parens++;
    }
    # closing paren - if paren count is 1 then this is an end of a token, so we
    # extract it from token string and push into token list.
    elsif ($substring eq ')')
    {
      $parens--;
      unless ($parens)
      {
        my $token = join('', @substrings[$begin_token .. $index]);
        push(@tokens, $token);
      }
    }
    # do nothing on other chars.
  }
  return @tokens;
}

sub min($$)
{
  return ($_[0] < $_[1]) ? $_[0] : $_[1];
}

sub read_file($$)
{
  my ($path, $filename)=@_;
  my @buf = ();

  # don't read a file twice
  foreach (@GtkDefs::read)
  {
    return "" if ($_ eq "$path/$filename");
  }
  push @GtkDefs::read, "$path/$filename";

  # read file while stripping comments
  open(FILE, "$path/$filename");
  while (<FILE>)
  {
     s/^;.*$//;  # remove comments
     chop;      # remove new lines
     push(@buf, $_);
  }
  close(FILE);

  $_ = join("", @buf);
  s/\s+/ /g;
  return $_;
}


sub on_enum($)
{
  my $thing = Enum::new(shift(@_));
  $GtkDefs::enums{$$thing{c_type}} = $thing;
}

sub on_object($)
{
  my $thing = Object::new(shift(@_));
  $GtkDefs::objects{$$thing{c_name}} = $thing;
}

sub on_function($)
{
  my $thing = GtkDefs::Function::new(shift(@_));
  $GtkDefs::methods{$$thing{c_name}} = $thing;
}

sub on_method($)
{
  my $thing = GtkDefs::Function::new(shift(@_));
  $GtkDefs::methods{$$thing{c_name}} = $thing if ($thing);
}

sub on_property($)
{
  my $thing = Property::new(shift(@_));
  $GtkDefs::properties{"$$thing{class}::$$thing{name}"} = $thing;
}

sub on_signal($)
{
  my $thing = GtkDefs::Signal::new(shift(@_));
  $GtkDefs::signals{"$$thing{class}::$$thing{name}"} = $thing;
}

sub on_vfunc($)
{
  my $thing = GtkDefs::Signal::new(shift(@_));
  $GtkDefs::signals{"$$thing{class}::$$thing{name}"} = $thing;
}

##########################

sub get_enums
{
  return sort {$$a{c_type} cmp $$b{c_type}} values %GtkDefs::enums;
}
sub get_methods
{
  return sort {$$a{c_name} cmp $$b{c_name}} values %GtkDefs::methods;
}
sub get_signals
{
  return sort {$$a{name} cmp $$b{name}} values %GtkDefs::signals;
}
sub get_properties
{
  return sort {$$a{name} cmp $$b{name}} values %GtkDefs::properties;
}

sub get_marked
{
  no warnings;
  return grep {$$_{mark}==1} values %GtkDefs::methods; 
}

# This searches for items wrapped by this file and then tries to locate
# other methods/signals/properties which may have been left unmarked.
sub get_unwrapped
{
  # find methods which were used in a _WRAP or _IGNORE.
  my @targets;
  push @targets,grep {$$_{entity_type} eq "method" && $$_{mark}==1} values %GtkDefs::methods;
  push @targets,grep {$$_{mark}==1} values %GtkDefs::signals;
  push @targets,grep {$$_{mark}==1} values %GtkDefs::properties;

  # find the classes which used them.
  my @classes = unique(map { $$_{class} } @targets);

  # find methods/signals/properties which are in those classes which didn't get marked.
  my @unwrapped;
  my $class;
  foreach $class (@classes)
  {
    # if this class's parent is defined then don't put its properties as unwrapped.
    # this may not work if parent is from other library (GtkApplication's parent
    # is GApplication, so all its properties will be marked as unwrapped)
    my $detailed = 0;
    my $parent = undef;
    if (exists $GtkDefs::objects{$class})
    {
      my $object = $GtkDefs::objects{$class};

      if (defined $object)
      {
        $parent = $object->{parent};

        # may be empty for some classes deriving a GInterface?
        if ($parent)
        {
          $detailed = 1;
        }
      }
    }
    if ($detailed)
    {
      push @unwrapped, grep {$$_{class} eq $class && $$_{mark}==0 && not exists $GtkDefs::properties{$parent . '::' . $_->{name}}} values %GtkDefs::properties;
    }
    else
    {
      push @unwrapped, grep {$$_{class} eq $class && $$_{mark}==0} values %GtkDefs::properties;
    }

    push @unwrapped, grep {$$_{class} eq $class && $$_{mark}==0} values %GtkDefs::methods;
    push @unwrapped, grep {$$_{class} eq $class && $$_{mark}==0} values %GtkDefs::signals;
  }

  return @unwrapped;
}

##########################

sub lookup_enum($)
{
  no warnings;
  my ($c_type) = @_;
  my $obj = $GtkDefs::enums{$c_type};
  return 0 if(!$obj);
  $$obj{mark} = 1;
  return $obj;
}

sub lookup_object($)
{
  no warnings;

  my $c_name = $_[0];
  my $result = $GtkDefs::objects{$c_name};

  if (not defined($result))
  {
    # We do not print this error because it's not always an error, 
    # because the caller will often try several object names,
    # while guessing an object name prefix from a function name.
    #
    # print "GtkDefs:lookup_object(): can't find object with name=" . $c_name . "\n";

    # debug output:
    # foreach my $key (keys %GtkDefs::objects)
    # {
    #  print "  possible name=" . $key . "\n";
    # }
  }

  return $result;
}

# $objProperty lookup_property($name, $parent_object_name)
sub lookup_property($$)
{
  no warnings;
  my ($parent_object_name, $name) = @_;
  $name =~ s/-/_/g;
  my $obj = $GtkDefs::properties{"${parent_object_name}::${name}"};
  return 0 if ($obj eq "");
  $$obj{mark} = 1;
  return $obj;
}

sub lookup_method_dont_mark($)
{
  no warnings;
  my ($c_name) = @_;
  $c_name =~ s/-/_/g;

  my $obj = $GtkDefs::methods{$c_name};
  return 0 if ($obj eq "");

  return $obj;
}

sub lookup_method($)
{
  my $obj = lookup_method_dont_mark($_[0]);

  $$obj{mark} = 1 if($obj);
  return $obj;
}

sub lookup_function($)
{
  return lookup_method($_[0]);
}

sub lookup_method_set_weak_mark($)
{
  my $obj = lookup_method_dont_mark($_[0]);

  # A constructor or a static method may be listed in the .defs file as a method
  # of another class, if its first parameter is a pointer to a class instance.
  # Examples:
  #   GVariantIter* g_variant_iter_new(GVariant* value)
  #   GtkWidget* gtk_application_window_new(GtkApplication* application)
  #   GSocketConnection* g_socket_connection_factory_create_connection(GSocket* socket)
  #
  # The use of gtk_application_window_new() in Gtk::ApplicationWindow shall
  # not cause get_unwrapped() to list all methods, signals and properties of
  # GtkApplication as unwrapped in applicationwindow.hg.
  # Therefore mark=2 instead of mark=1.

  $$obj{mark} = 2 if ($obj && $$obj{mark} == 0);
  return $obj;
}

sub lookup_signal($$)
{
  no warnings;
  my ($parent_object_name, $name) = @_;

  $name =~ s/-/_/g;
  my $obj = $GtkDefs::signals{"${parent_object_name}::${name}"};
  return 0 if ($obj eq "");
  $$obj{mark} = 1;
  return $obj;
}

sub error
{
  my $format = shift @_;
  printf STDERR "GtkDefs.pm: $format\n", @_;
}


########################################################################
package GtkDefs::Function;
BEGIN { @GtkDefs::Function::ISA=qw(FunctionBase); }

#  class Function : FunctionBase
#    {
#       string name;   e.g. function: gtk_accelerator_valid, method: clicked
#       string c_name; e.g. gtk_accelerator_valid, gtk_button_clicked
#       string class;  e.g. GtkButton
#
#       string rettype;
#       string array param_types;
#       string array param_names;
#
#       string entity_type; e.g. method or function
#
#       bool varargs;
#       bool mark;
#    }

# "new" can't have prototype
sub new
{
  my ($def) = @_;
  my $whole = $def;
  my $self = {};
  bless $self;

  #Remove first and last braces:
  $def =~ s/^\(//;
  $def =~ s/\)$//;

  #In rare cases a method can be nameless (g_iconv).
  #Don't interpret the following "(of-object" as the method's name.
  $def =~ s/^\s*define-([^\s\(]+)\s*([^\s\(]*)\s*//;
  $$self{entity_type} = $1;
  $$self{name} = $2;
  $$self{name} =~ s/-/_/g; # change - to _

  # init variables
  $$self{mark} = 0;
  $$self{rettype} = "none";
  $$self{param_types} = [];
  $$self{param_names} = [];
  $$self{class} = "";

  # snarf down lisp fields
  $$self{c_name} = $1     if ($def=~s/\(c-name "(\S+)"\)//);
  $$self{class} = $1      if ($def=~s/\(of-object "(\S+)"\)//);

  if ($def =~ s/\(return-type "(\S+)"\)//)
  {
    $$self{rettype} = $1;
    $$self{rettype} =~ s/-/ /g; #e.g. replace const-gchar* with const gchar*. Otherwise it will be used in code.
  }

  $$self{varargs} = 1     if ($def=~s/\(varargs\s+#t\)//);
  $$self{rettype} = "void"  if ($$self{rettype} eq "none");

  # methods have a parameter not stated in the defs file
  if ($$self{entity_type} eq "method")
  {
    push( @{$$self{param_types}}, "$$self{class}*" );
    push( @{$$self{param_names}}, "self" );
  }

  # parameters are compound lisp statement
  if ($def =~ s/\(parameters(( '\("\S+" "\S+"\))*) \)//)
  {
    $self->parse_param($1);
  }

  # is-constructor-of:
  if ($def =~ s/\(is-constructor-of "(\S+)"\)//)
  {
    #Ignore them.
  }

  # of-object
  if ($def =~ s/\(of-object "(\S+)"\)//)
  {
    #Ignore them.
  }

  GtkDefs::error("Unhandled function parameter ($def) in $$self{c_name}\n")
    if ($def !~ /^\s*$/);

  return $self;
}

sub parse_param($$)
{
  my ($self, $param) = @_;

  # break up the parameter statements
  foreach (split(/\s*'*[()]\s*/, $param))
  {
    next if ($_ eq "");
    if (/^"(\S+)" "(\S+)"$/)
    {
      my ($p1, $p2) = ($1,$2);
      $p1 =~ s/-/ /;
      push( @{$$self{param_types}}, $p1);
      push( @{$$self{param_names}}, $p2);
    }
    else
    {
      GtkDefs::error("Unknown parameter statement ($_) in $$self{c_name}\n");
    }
  }
}


# $string get_return_type_for_methods().
# Changes gchar* (not const-gchar*) to return-gchar* so that _CONVERT knows that it needs to be freed.
sub get_return_type_for_methods($)
{
  my ($self) = @_;

  my $rettype = $$self{rettype};
  if($rettype eq "gchar*" || $rettype eq "char*")
  {
    $rettype = "return-" . $rettype;
  }

  return $rettype;
}

sub get_param_names
{
  my ($self) = @_;
  return @$self{param_names};
}

######################################################################
package GtkDefs::Signal;
BEGIN { @GtkDefs::Signal::ISA=qw(GtkDefs::Function); }

#  class Signal : Function
#    {
#       string name; e.g. gtk_accelerator_valid
#       string class e.g. GtkButton ( == of-object.)
#
#       string rettype;
#
#       string when. e.g. first, last, or both.
#       string entity_type. e.g. method or signal
#    }

# "new" can't have prototype
sub new
{
  my ($def) = @_;

  my $whole = $def;
  my $self = {};
  bless $self;

  #Remove first and last braces:
  $def =~ s/^\(//;
  $def =~ s/\)$//;

  $def =~ s/^\s*define-(\S+)\s+(\S+)\s*//;
  $$self{entity_type} = $1;
  $$self{name} = $2;
  $$self{name} =~ s/-/_/g; #change - to _

  # init variables
  $$self{mark}=0;
  $$self{rettype} = "none";
  $$self{param_types} = [];
  $$self{param_names} = [];
  $$self{when} = "";
  $$self{class} = "";

  # snarf down lisp fields
  if($def =~ s/\(of-object "(\S+)"\)//)
  {
    $$self{class} = $1;
  }
  else
  {
    GtkDefs::error("define-signal/define-vfunc without of-object (entity type: $$self{entity_type}): $whole");
  }

  if($def =~ s/\(return-type "(\S+)"\)//)
  {
    $$self{rettype} = $1;
    $$self{rettype} =~ s/-/ /g; #e.g. replace const-gchar* with const gchar*. Otherwise it will be used in code.
  }

  if($def =~ s/\(when "(\S+)"\)//)
  {
    $$self{when} = $1;
  }

  if($$self{rettype} eq "none")
  {
    $$self{rettype} = "void"
  }

  # signals always have a parameter
  push(@{$$self{param_types}}, "$$self{class}*");
  push(@{$$self{param_names}}, "self");

  # parameters are compound lisp statement
  if ($def =~ s/\(parameters(( '\("\S+" "\S+"\))+) \)//)
  {
    $self->parse_param($1);
  }

  if ($def!~/^\s*$/)
  {
	  GtkDefs::error("Unhandled signal/vfunc def ($def) in $$self{class}::$$self{name}");
  }

  return $self;
}

# bool has_same_types($objFunction)
# Compares return types and argument types
sub has_same_types($$)
{
  my ($self, $objFuncOther) = @_;

  #Compare return types:
  if($self->types_are_equal($$self{rettype}, $$objFuncOther{rettype}) ne 1)
  {
    # printf("debug: different return types: %s, %s\n", $$self{rettype}, $$objFuncOther{rettype});
    return 0; #Different types found.
  }

  #Compare arguement types:
  my $i = 0;
  my $param_types = $$self{param_types};
  my $param_types_other = $$objFuncOther{param_types};
  for ($i = 1; $i < $#$param_types + 1; $i++)
  {
    my $type_a = $$param_types[$i];
    my $type_b = $$param_types_other[$i-1];

    if($self->types_are_equal($type_a, $type_b) ne 1)
    {
      # printf("debug: different arg types: %s, %s\n", $type_a, $type_b);
      return 0; #Different types found.
    }
  }

  return 1; #They must all be the same for it to get this far.
}

# bool types_are_equal($a, $b)
# Compares types, ignoring gint/int differences, etc.
sub types_are_equal($$$)
{
  #TODO: Proper method of getting a normalized type name.

  my ($self, $type_a, $type_b) = @_;

  if($type_a ne $type_b)
  {
    #Try adding g to one of them:
    if( ("g" . $type_a) ne $type_b )
    {
      #Try adding g to the other one:
      if( $type_a ne ("g" . $type_b) )
      {
        #After all these checks it's still not equal:
        return 0; #not equal.
      }
    }
  }

  # printf("DEBUG: types are equal: %s, %s\n", $$type_a, $$type_b);
  return 1; #They must be the same for it to get this far.
}

1; # indicate proper module load.
