// -*- C++ -*-
// ETCL_Interpreter.cpp,v 1.2 2003/11/04 05:21:32 dhinton Exp

#include "ETCL_Interpreter.h"
#include "ETCL_Constraint.h"
#include "ace/Guard_T.h"
#include "ace/Thread_Mutex.h"

ACE_RCSID(ETCL, ETCL_Interpreter, "ETCL_Interpreter.cpp,v 1.2 2003/11/04 05:21:32 dhinton Exp")

TAO_SYNCH_MUTEX TAO_ETCL_Interpreter::parserMutex__;

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

TAO_ETCL_Interpreter::~TAO_ETCL_Interpreter (void)
{
  delete this->root_;
}

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

  TAO_Lex_String_Input::reset ((char*)constraints);

  yyval.constraint = 0;
  int return_value = ::yyparse ();

  if (return_value == 0 && yyval.constraint != 0)
    {
      this->root_ = yyval.constraint;
    }
  else
    {
      this->root_ = 0;
    }

  return return_value;
}

int
TAO_ETCL_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_);
}
