====== Language plugins : Implementation ======

===== parse, print command =====

==== Background ====

A command object executes a command, does not store anything.  The reference to "dot" and "dotcard" is historical, because in Spice, commands were prefixed by a dot.

This section may change as scripting is enhanced.

For reference, here is the class definition from d_dot.h .

<code cpp>
/*--------------------------------------------------------------------------*/
class DEV_DOT : public CARD {
private:
  std::string	_s;
  explicit DEV_DOT(const DEV_DOT& p) :CARD(p) {set_constant(true);}
public:
  explicit	DEV_DOT()		:CARD() {set_constant(true);}
private: // override virtual
  std::string   value_name()const	{return "";}
  char		id_letter()const	{untested();return '\0';}
  std::string	dev_type()const		{untested();return "dotcard";}
  CARD*		clone()const		{return new DEV_DOT(*this);}
public:
  void set(const std::string& S) {_s = S;}
  const std::string& s()const {return _s;}
};
/*--------------------------------------------------------------------------*/
</code>

==== parse_command ====

The parse function reads the string and executes it by calling ''CMD::cmdproc''.  Then the new object is deleted, and the function returns a NULL pointer.

<code cpp>
/*--------------------------------------------------------------------------*/
DEV_DOT* LANG_VERILOG::parse_command(CS& cmd, DEV_DOT* x)
{
  assert(x);
  x->set(cmd.fullstring());
  CARD_LIST* scope = (x->owner()) ? x->owner()->subckt() : &CARD_LIST::card_list;

  cmd.reset(0);
  CMD::cmdproc(cmd, scope);
  delete x;
  return NULL;
}
/*--------------------------------------------------------------------------*/
</code>

==== print_command ====

For now, all that is needed is to print it.

<code cpp>
/*--------------------------------------------------------------------------*/
void LANG_VERILOG::print_command(OMSTREAM& o, const DEV_DOT* x)
{
  assert(x);
  o << x->s() << '\n';
}
/*--------------------------------------------------------------------------*/
</code>