// ast_constant.cpp,v 1.24 2003/11/10 20:29:24 dhinton Exp

/*

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*/

// AST_Constant nodes denote IDL constant declarations.
// AST_Constants have a value (an AST_Expression) and a value type
// (a value from the enum AST_Expression::ExprType).
// AST_Constant has two constructors, one for use in creating constants
// and the other for use in creating enumerators (see the class
// AST_EnumVal).

#include "ast_constant.h"
#include "utl_identifier.h"
#include "ast_visitor.h"
#include "ast_generator.h"
#include "nr_extern.h"

ACE_RCSID (ast, 
           ast_constant, 
           "ast_constant.cpp,v 1.24 2003/11/10 20:29:24 dhinton Exp")

// Static functions.

// Convert a value from the enum AST_Expression::ExprType to a char *.
const char *
AST_Constant::exprtype_to_string (AST_Expression::ExprType et)
{
  switch (et)
    {
    case AST_Expression::EV_short:
      return "Short";
    case AST_Expression::EV_ushort:
      return "UShort";
    case AST_Expression::EV_long:
      return "Long";
    case AST_Expression::EV_ulong:
      return "ULong";
    case AST_Expression::EV_float:
      return "Float";
    case AST_Expression::EV_double:
      return "Double";
    case AST_Expression::EV_char:
      return "Char";
    case AST_Expression::EV_octet:
      return "Octet";
    case AST_Expression::EV_bool:
      return "Boolean";
    case AST_Expression::EV_string:
      return "Char*";
    case AST_Expression::EV_ulonglong:
      return "ULongLong";
    case AST_Expression::EV_longlong:
      return "LongLong";
    case AST_Expression::EV_wchar:
      return "Wchar";
    case AST_Expression::EV_wstring:
      return "Wchar*";
    case AST_Expression::EV_longdouble:
      return "LongDouble";
    default:
      break;
    }

  return 0;
}

// Constructor(s) and destructor.

// Default constructor.
AST_Constant::AST_Constant (void)
  : COMMON_Base (),
    AST_Decl (),
    pd_constant_value (0),
    pd_et (AST_Expression::EV_none),
    ifr_added_ (0)
{
}

// Used in constructing AST_EnumVal nodes.
AST_Constant::AST_Constant (AST_Expression::ExprType t,
			                      AST_Decl::NodeType nt,
			                      AST_Expression *v,
			                      UTL_ScopedName *n)
  : COMMON_Base (),
    AST_Decl (nt,
              n),
	  pd_constant_value (v),
	  pd_et (t),
    ifr_added_ (0)
{
}

// Used when constructing AST_Constant nodes.
AST_Constant::AST_Constant (AST_Expression::ExprType t,
			                      AST_Expression *v,
			                      UTL_ScopedName *n)
  : COMMON_Base (),
    AST_Decl (AST_Decl::NT_const,
              n),
	  pd_constant_value (v),
	  pd_et (t),
    ifr_added_ (0)
{
  // Avoids a truncation warning on MSVC when assigning a decimal
  // literal to a float constant. Must also check that the input
  // expression is of type double (indicates that we are being
  // assigned from a literal). If v is of type float, it may be
  // a constant-to-constant assignment - in any case the danger
  // of truncation would not apply.
  if (t == AST_Expression::EV_float && v->ev ()->et == AST_Expression::EV_double)
    {
      AST_Expression::AST_ExprValue *ev = 
        this->pd_constant_value->ev ();
      ev->et = t;
      ev->u.fval = (float) ev->u.dval;
    }
  // Allows the enum value string name to be used in generating the
  // rhs of the constant assignment.
  else if (t == AST_Expression::EV_enum)
    {
      this->pd_constant_value->ev ()->et = t;
    }
}

AST_Constant::~AST_Constant (void)
{
}

// Redefinition of inherited virtual operations.

// Dump this AST_Constant node to the ostream o.
void
AST_Constant::dump (ACE_OSTREAM_TYPE &o)
{
  this->dump_i (o, "const ");
  this->dump_i (o, this->exprtype_to_string ());
  this->dump_i (o, " ");

  this->local_name ()->dump (o);

  this->dump_i (o, " = ");

  this->pd_constant_value->dump (o);
}

int
AST_Constant::ast_accept (ast_visitor *visitor)
{
  return visitor->visit_constant (this);
}

void
AST_Constant::destroy (void)
{
  if (this->pd_constant_value != 0)
    {
      this->pd_constant_value->destroy ();
      delete this->pd_constant_value;
      this->pd_constant_value = 0;
    }
}

// Data accessors.

AST_Expression *
AST_Constant::constant_value (void)
{
  return this->pd_constant_value;
}

AST_Expression::ExprType
AST_Constant::et (void)
{
  return this->pd_et;
}

idl_bool
AST_Constant::ifr_added (void)
{
  return this->ifr_added_;
}

void
AST_Constant::ifr_added (idl_bool val)
{
  this->ifr_added_ = val;
}

const char *
AST_Constant::exprtype_to_string (void)
{
  switch (this->pd_et)
    {
    case AST_Expression::EV_short:
      return "CORBA::Short";
    case AST_Expression::EV_ushort:
      return "CORBA::UShort";
    case AST_Expression::EV_long:
      return "CORBA::Long";
    case AST_Expression::EV_ulong:
      return "CORBA::ULong";
    case AST_Expression::EV_float:
      return "CORBA::Float";
    case AST_Expression::EV_double:
      return "CORBA::Double";
    case AST_Expression::EV_char:
      return "CORBA::Char";
    case AST_Expression::EV_octet:
      return "CORBA::Octet";
    case AST_Expression::EV_bool:
      return "CORBA::Boolean";
    case AST_Expression::EV_string:
      return "char *const";
    case AST_Expression::EV_void:
      return "void";
    case AST_Expression::EV_none:
      return "none";
    case AST_Expression::EV_longlong:
      return "CORBA::LongLong";
    case AST_Expression::EV_ulonglong:
      return "CORBA::ULongLong";
    case AST_Expression::EV_wchar:
      return "CORBA::WChar";
    case AST_Expression::EV_wstring:
      return "CORBA::WChar *const";
    case AST_Expression::EV_enum:
    case AST_Expression::EV_longdouble:
    case AST_Expression::EV_any:
    case AST_Expression::EV_object:
      return 0;
    }

  return 0;
}

UTL_ScopedName *
AST_Constant::enum_full_name (void)
{
  if (this->pd_et == AST_Expression::EV_enum)
    {
      UTL_Scope *s = this->defined_in ();
      AST_Decl *d = s->lookup_by_name (this->pd_constant_value->n (),
                                       1);
      return (ScopeAsDecl (d->defined_in ()))->name ();
    }
  else
    {
      return 0;
    }
}

// Narrowing methods.
IMPL_NARROW_METHODS1(AST_Constant, AST_Decl)
IMPL_NARROW_FROM_DECL(AST_Constant)
