// Interpreter.cpp,v 1.5 2003/11/04 05:21:32 dhinton Exp

#include "Interpreter.h"
#include "ace/OS_NS_string.h"

TAO_SYNCH_MUTEX TAO_Interpreter::parserMutex__;

TAO_Interpreter::TAO_Interpreter (void)
  : root_ (0)
{
}

TAO_Interpreter::~TAO_Interpreter (void)
{
  delete root_;
}

int
TAO_Interpreter::build_tree (const char* constraints)
{
  ACE_GUARD_RETURN (TAO_SYNCH_MUTEX,
                    guard,
                    TAO_Interpreter::parserMutex__,
                    -1);

  TAO_Lex_String_Input::reset ((char*)constraints);
  int return_value = 0;

  yyval.constraint_ = 0;
  return_value = ::yyparse ();

  if (return_value == 0 && yyval.constraint_ != 0)
    this->root_ = yyval.constraint_;
  else
    {
      while (yylex () > 0)
        continue;
      this->root_ = 0;
    }

  return return_value;
}

int
TAO_Interpreter::is_empty_string (const char* str)
{
  int return_value = 0;

  if (str != 0)
    {
      int i = 0;
      while (str[i] != '\0')
        {
          if (str[i] != ' ')
            break;

          i++;
        }

      if (str[i] == '\0')
        return_value = 1;
    }

  return return_value;
}

char* TAO_Lex_String_Input::string_ = 0;
char* TAO_Lex_String_Input::current_ = 0;
char* TAO_Lex_String_Input::end_ = 0;

// Routine to have Lex read its input from the constraint string.

int
TAO_Lex_String_Input::copy_into (char* buf, int max_size)
{
  int chars_left =  TAO_Lex_String_Input::end_ - TAO_Lex_String_Input::current_;
  int n = max_size > chars_left ? chars_left : max_size;

  if (n > 0)
    {
      ACE_OS:: memcpy (buf,
                       TAO_Lex_String_Input::current_,
                       n);
      TAO_Lex_String_Input::current_ += n;
    }

  return n;
}

void
TAO_Lex_String_Input::reset (char* input_string)
{
  TAO_Lex_String_Input::string_ = input_string;
  TAO_Lex_String_Input::current_ = input_string;
  TAO_Lex_String_Input::end_ = input_string +
    ACE_OS::strlen (TAO_Lex_String_Input::string_);
}
