
/*
 
COPYRIGHT
 
Copyright 1992, 1993, 1994 Sun Microsystems, Inc.  Printed in the United
States of America.  All Rights Reserved.
 
This product is protected by copyright and distributed under the following
license restricting its use.
 
The Interface Definition Language Compiler Front End (CFE) is made
available for your use provided that you include this license and copyright
notice on all media and documentation and the software program in which
this product is incorporated in whole or part. You may copy and extend
functionality (but may not remove functionality) of the Interface
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Microsystems, Inc. ("Sun").
 
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distribution of Interface Definition Language CFE as permitted herein.
 
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and documentation for the Interface Definition Language CFE.
 
INTERFACE DEFINITION LANGUAGE CFE IS PROVIDED AS IS WITH NO WARRANTIES OF
ANY KIND INCLUDING THE WARRANTIES OF DESIGN, MERCHANTIBILITY AND FITNESS
FOR A PARTICULAR PURPOSE, NONINFRINGEMENT, OR ARISING FROM A COURSE OF
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 */


/*
 * utl_stack.cc - Implementation of class UTL_ScopeStack
 */

#include "idl.h"
#include "idl_extern.h"

// Class UTL_ScopeStack

#undef INCREMENT
#define INCREMENT 64

/*
 * Constructor(s) and destructor
 */

UTL_ScopeStack::UTL_ScopeStack()
   :    pd_stack_data(new UTL_Scope *[INCREMENT]),
        pd_stack_data_nalloced(INCREMENT),
        pd_stack_top(0)
{}

UTL_ScopeStack::~UTL_ScopeStack()
{
   if (pd_stack_data != NULL)
      delete pd_stack_data;
}

/*
 * Private operations
 */

/*
 * Public operations
 */

// Push an element on the stack
UTL_ScopeStack *
UTL_ScopeStack::push(UTL_Scope *el)
{
   UTL_Scope **tmp;
   long ostack_data_nalloced;
   long i;

   // Make sure there's space for one more

   if (pd_stack_data_nalloced == pd_stack_top)
   {
      ostack_data_nalloced = pd_stack_data_nalloced;
      pd_stack_data_nalloced += INCREMENT;
      tmp = new UTL_Scope * [pd_stack_data_nalloced];

      for (i = 0; i < ostack_data_nalloced; i++)
         tmp[i] = pd_stack_data[i];

      delete pd_stack_data;

      pd_stack_data = tmp;
   }

   // Insert new scope
   pd_stack_data[pd_stack_top++] = el;

   return this;
}

// Pop an element from the stack

void UTL_ScopeStack::pop ()
{
   if (pd_stack_top > 0)
   {
      pd_stack_top--;
   }
}

// Return top element on stack

UTL_Scope * UTL_ScopeStack::top ()
{
   if (pd_stack_top <= 0)
      return NULL;

   return pd_stack_data[pd_stack_top - 1];
}

// Return bottom element on stack
UTL_Scope *
UTL_ScopeStack::bottom()
{
   if (pd_stack_top == 0)
      return NULL;

   return pd_stack_data[0];
}

// Clear entire stack
void
UTL_ScopeStack::clear()
{
   pd_stack_top = 0;
}

// How deep is the stack?
unsigned long
UTL_ScopeStack::depth()
{
   return pd_stack_top;
}

// Return (top - 1) element on stack
UTL_Scope *
UTL_ScopeStack::next_to_top()
{
   UTL_Scope *tmp, *retval;

   if (depth() < 2)
      return NULL;

   tmp = top();  // Save top

   (void) pop();  // Pop it

   retval = top(); // Get next one down

   (void) push(tmp); // Push top back

   return retval; // Return next one down
}

// Return topmost non-NULL element
UTL_Scope * UTL_ScopeStack::top_non_null ()
{
   long i;

   for (i = pd_stack_top - 1; i >= 0; i--)
      if (pd_stack_data[i] != NULL)
         return pd_stack_data[i];

   return NULL;
}

/*
 * Redefinition of inherited virtual operations
 */

// Class UTL_ScopeStackActiveIterator

/*
 * Constructor(s)
 */

UTL_ScopeStackActiveIterator::UTL_ScopeStackActiveIterator(UTL_ScopeStack *s)
      : source(s),
      il(s->pd_stack_top - 1)
{}

/*
 * Private operations
 */

/*
 * Public operations
 */

// Advance to next item
void
UTL_ScopeStackActiveIterator::next()
{
   il--;
}

// Get current item
UTL_Scope *
UTL_ScopeStackActiveIterator::item()
{
   if (il >= 0)
      return source->pd_stack_data[il];

   return NULL;
}

// Is this iteration done?
long
UTL_ScopeStackActiveIterator::is_done()
{
   if (il >= 0)
      return false;

   return true;
}

/*
 * Redefinition of inherited virtual operations
 */
