Class: Rubber::C_Enum

Inherits:
Object
  • Object
show all
Includes:
RegisterChildren
Defined in:
lib/rubber/codegen/enum.rb

Direct Known Subclasses

C_GEnum, C_GFlags

Constant Summary collapse

@@declared_base = 
false
@@declared_register = 
false

Instance Attribute Summary collapse

Attributes included from RegisterChildren

#source_file, #source_line

Instance Method Summary collapse

Methods included from RegisterChildren

#cname, #register_children

Instance Attribute Details

#child_names ⇒ Object (readonly)

Returns the value of attribute child_names.



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# File 'lib/rubber/codegen/enum.rb', line 5

def child_names
  @child_names
end

Instance Method Details

#code(io) ⇒ Object 



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# File 'lib/rubber/codegen/enum.rb', line 15

def code(io)
end

#declare(io) ⇒ Object 



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# File 'lib/rubber/codegen/enum.rb', line 17

def declare(io)
  io.puts "static VALUE #{cname};"
  unless @@declared_base
  	@@declared_base = true
  	io.puts "

static VALUE enumBaseClass;

typedef struct {
	int value;
	char *name;
	char *fullname;
} EnumData;

static VALUE make_enum_value(VALUE klass, int value, char *name, char *fullname)
{
	EnumData *data = NULL;
	
	data = ALLOC(EnumData);
	data->value = value;
	data->name = name;
	data->fullname = fullname;
	
	return Data_Wrap_Struct(klass, NULL, free, data);
}
static int enum_value_to_int(VALUE value, VALUE klass)
{
	switch (TYPE(value))
	{
	case T_FIXNUM:
	case T_FLOAT:
return NUM2INT(value);
	break;
	case T_DATA:
if (rb_obj_is_kind_of(value, enumBaseClass))
{
	EnumData *data = NULL;
	
	if ((klass != Qnil) && (!rb_obj_is_kind_of(value, klass)))
	{
		rb_raise(rb_eTypeError, \"Wrong type of enum  %s (%s required)\", rb_obj_classname(value), rb_class2name(klass));
	}
	
	Data_Get_Struct(value, EnumData, data);
	return data->value;
}
	break;
	}
	return 0;
	
}

static VALUE rubber_enum_inspect(VALUE value)
{
	EnumData *data = NULL;
	volatile VALUE str = rb_str_new(\"#<\", 2);
	char number[16] = \"\"; 
	
	Data_Get_Struct(value, EnumData, data);
	
	rb_str_cat2(str, rb_obj_classname(value));
	rb_str_cat2(str, \" - \");
	rb_str_cat2(str, data->name);
	rb_str_cat2(str, \"(\");
	sprintf(number, \"%i\", data->value);
	rb_str_cat2(str, number);
	rb_str_cat2(str, \")>\");
	
	return str;
}

static VALUE rubber_enum_to_s(VALUE value)
{
	EnumData *data = NULL;
	
	Data_Get_Struct(value, EnumData, data);
	
	return rb_str_new2(data->fullname);
}
static VALUE rubber_enum_name(VALUE value)
{
	EnumData *data = NULL;
	
	Data_Get_Struct(value, EnumData, data);
	
	return rb_str_new2(data->name);
}

static VALUE rubber_enum_cmp(VALUE value, VALUE other)
{
	VALUE a,b;
	a = rb_funcall(value, rb_intern(\"to_i\"), 0);
	b = rb_funcall(other, rb_intern(\"to_i\"), 0);
#ifdef RB_NUM_COERCE_FUNCS_NEED_OPID
	return rb_num_coerce_cmp(a, b, rb_intern(\"==\"));
#else
	return rb_num_coerce_cmp(a, b);
#endif
}

static VALUE rubber_enum_to_i(VALUE value)
{
	EnumData *data = NULL;
	
	Data_Get_Struct(value, EnumData, data);
	
	return INT2FIX(data->value);
}

static VALUE rubber_enum_coerce(VALUE value, VALUE other)
{
	EnumData *data = NULL;
	
	Data_Get_Struct(value, EnumData, data);
	
	switch(TYPE(other))
	{
	case T_FIXNUM:
	case T_BIGNUM:
return INT2FIX(data->value);
	case T_FLOAT:
return rb_float_new(data->value);
	default:
return Qnil;
	}
}

"
  end
  args.each do |arg|
    io.puts "static VALUE #{default_cname}_#{arg} = Qnil;"
  end    
  io.puts "typedef int #{name};
#ifdef __GNUC__
// No point in declaring these unless we're using GCC
// They're ahead of any code that uses them anyway.
static VALUE enum_#{name}_to_ruby(int value)
__attribute__ ((unused))
;
static int enum_ruby_to_#{name}(VALUE val)
__attribute__ ((unused))
;
#endif

"
  io.puts "static VALUE enum_#{name}_to_ruby(int value) { switch(value) {"
  args.each do |arg|
    io.puts "    case #{arg}: return #{default_cname}_#{arg};"
  end    
  io.puts "}; return Qnil; }"
  io.puts "static int enum_ruby_to_#{name}(VALUE val) { return enum_value_to_int(val, #{cname}); }"
end

#default_cname ⇒ Object 



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# File 'lib/rubber/codegen/enum.rb', line 170

def default_cname
  "enum"+name
end

#doc_rd(io) ⇒ Object 



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# File 'lib/rubber/codegen/enum.rb', line 173

def doc_rd(io)
  depth = (fullname.gsub(/[^:]/,'').size >> 1)
  io.puts "=#{'=' * depth} enum #{fullname}"
end

#fullname ⇒ Object 



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# File 'lib/rubber/codegen/enum.rb', line 180

def fullname()
  if parent and parent.respond_to?(:fullname)
    "#{parent.fullname}::#{name}"
  else
    name
  end
end

#get_root ⇒ Object 



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# File 'lib/rubber/codegen/enum.rb', line 177

def get_root(); is_root? ? self : parent.get_root; end

#init ⇒ Object 



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# File 'lib/rubber/codegen/enum.rb', line 8

def init()
  ($custom_maps[name] ||= {})["VALUE"] = "enum_#{name}_to_ruby((%%))"
  ($custom_maps["VALUE"] ||= {})[name] = "enum_ruby_to_#{name}((%%))"
  STDERR.puts "Auto-adding custom map for #{name}"
  @splits = strip_prefixes(args)
  @strip = args.first.length - @splits.first.length
end

#is_root? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/rubber/codegen/enum.rb', line 177

def is_root?()
  not parent.respond_to?(:fullname)
end

#register(io, already_defined = false) ⇒ Object 



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# File 'lib/rubber/codegen/enum.rb', line 205

def register(io, already_defined=false)
  unless @@declared_register
  	@@declared_register = true
    io.puts "  enumBaseClass = rb_define_class(\"Enum\", rb_cObject);"
    io.puts '    rb_define_method(enumBaseClass, "inspect", rubber_enum_inspect, 0);'
    io.puts '    rb_define_method(enumBaseClass, "to_i", rubber_enum_to_i, 0);'
    io.puts '    rb_define_method(enumBaseClass, "coerce", rubber_enum_coerce, 1);'
    io.puts '    rb_define_method(enumBaseClass, "to_s", rubber_enum_to_s, 0);'
    io.puts '    rb_define_method(enumBaseClass, "to_str", rubber_enum_to_s, 0);'
    io.puts '    rb_define_method(enumBaseClass, "fullname", rubber_enum_to_s, 0);'
    io.puts '    rb_define_method(enumBaseClass, "name", rubber_enum_name, 0);'
    io.puts '    rb_define_method(enumBaseClass, "<=>", rubber_enum_cmp, 0);'
    io.puts '    '
  end
  if parent
    io.puts "  #{cname} = rb_define_class_under(#{parent.cname}, #{name.inspect}, enumBaseClass);"
  else
    io.puts "  #{cname} = rb_define_class(#{name.inspect}, enumBaseClass);"
  end
  
  args.each do |arg|
    uniq = arg[@strip..-1]
    uniq.sub!(/\A[^a-zA-Z]/,'')
    io.puts "    #{default_cname}_#{arg} = make_enum_value(#{cname}, #{arg}, #{uniq.downcase.gsub(/_/,'-').inspect}, #{arg.inspect});"
    io.puts "    rb_obj_freeze(#{default_cname}_#{arg});"
    io.puts "    rb_define_const(#{cname}, #{uniq.upcase.inspect}, #{default_cname}_#{arg});"
  end
end

#same_prefix(arr) ⇒ Object 



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# File 'lib/rubber/codegen/enum.rb', line 187

def same_prefix(arr)
  for i in arr
    return false if arr.first.first != i.first
  end
  return true
end

#strip_prefixes(arr) ⇒ Object 



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# File 'lib/rubber/codegen/enum.rb', line 193

def strip_prefixes(arr)
  splits = arr.collect { |i| i.strip.split(/_/) }
  while (same_prefix(splits))
    splits.each { |i| i.shift }
  end
  splits.collect!{|i| i.join('_') }
  splits
end