new file mode 100644
--- /dev/null
+++ b/src/pt-decl.cc
@@ -0,0 +1,171 @@
+/*
+
+Copyright (C) 1996, 1997 John W. Eaton
+
+This file is part of Octave.
+
+Octave is free software; you can redistribute it and/or modify it
+under the terms of the GNU General Public License as published by the
+Free Software Foundation; either version 2, or (at your option) any
+later version.
+
+Octave is distributed in the hope that it will be useful, but WITHOUT
+ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+for more details.
+
+You should have received a copy of the GNU General Public License
+along with Octave; see the file COPYING.  If not, write to the Free
+Software Foundation, 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
+
+*/
+
+#if defined (__GNUG__)
+#pragma implementation
+#endif
+
+#ifdef HAVE_CONFIG_H
+#include <config.h>
+#endif
+
+#include "error.h"
+#include "pt-cmd.h"
+#include "ov.h"
+#include "oct-lvalue.h"
+#include "pt-decl.h"
+#include "pt-exp.h"
+#include "pt-id.h"
+#include "pt-walk.h"
+
+// Declarations (global, static, etc.).
+
+tree_decl_elt::~tree_decl_elt (void)
+{
+  delete id;
+  delete expr;
+}
+
+void
+tree_decl_elt::accept (tree_walker& tw)
+{
+  tw.visit_decl_elt (*this);
+}
+
+// Initializer lists for declaration statements.
+
+void
+tree_decl_init_list::eval (tree_decl_elt::eval_fcn f, bool skip_init)
+{
+  for (Pix p = first (); p != 0; next (p))
+    {
+      f (*(this->operator () (p)), skip_init);
+
+      if (error_state)
+	break;
+    }
+}
+
+void
+tree_decl_init_list::accept (tree_walker& tw)
+{
+  tw.visit_decl_init_list (*this);
+}
+
+// Base class for declaration commands (global, static).
+
+tree_decl_command::~tree_decl_command (void)
+{
+  delete init_list;
+}
+
+void
+tree_decl_command::accept (tree_walker& tw)
+{
+  tw.visit_decl_command (*this);
+}
+
+// Global.
+
+static void
+do_global_init (tree_decl_elt& elt, bool skip_initializer)
+{
+  tree_identifier *id = elt.ident ();
+
+  if (id)
+    {
+      id->link_to_global ();
+
+      tree_expression *expr = elt.expression ();
+
+      if (expr)
+	{
+	  octave_value init_val = expr->rvalue ();
+
+	  octave_lvalue ult = id->lvalue ();
+
+	  ult.assign (octave_value::asn_eq, init_val);
+	}
+    }
+}
+
+void
+tree_global_command::eval (void)
+{
+  if (init_list)
+    {
+      init_list->eval (do_global_init, initialized);
+
+      initialized = true;
+    }
+
+  if (error_state > 0)
+    ::error ("evaluating global command near line %d, column %d",
+	     line (), column ());
+}
+
+// Static.
+
+static void
+do_static_init (tree_decl_elt& elt, bool)
+{
+  tree_identifier *id = elt.ident ();
+
+  if (id)
+    {
+      id->mark_as_static ();
+
+      tree_expression *expr = elt.expression ();
+
+      if (expr)
+	{
+	  octave_value init_val = expr->rvalue ();
+
+	  octave_lvalue ult = id->lvalue ();
+
+	  ult.assign (octave_value::asn_eq, init_val);
+	}
+    }
+}
+
+void
+tree_static_command::eval (void)
+{
+  // Static variables only need to be marked and initialized once.
+
+  if (init_list && ! initialized)
+    {
+      init_list->eval (do_static_init, initialized);
+
+      initialized = true;
+
+      if (error_state > 0)
+	::error ("evaluating static command near line %d, column %d",
+		 line (), column ());
+    }
+}
+
+/*
+;;; Local Variables: ***
+;;; mode: C++ ***
+;;; End: ***
+*/