Allow multi-level classdef package. * lex.h (octave_base_lexer::fq_identifier_contains_keyword, octave_base_lexer::handle_fq_identifier, octave_base_lexer::enable_fq_identifier): New methods. * lex.ll (octave_base_lexer::fq_identifier_contains_keyword, octave_base_lexer::handle_fq_identifier, octave_base_lexer::enable_fq_identifier): Likewise. (FQ_IDENT_START, FQIDENT): New exclusive start condition and regex to handle fully-qualified identifier. (superclass reference rule, metaclass query rule): Use FQIDENT. (octave_base_lexer::handle_superclass_identifier, octave_base_lexer::handle_meta_identifier): Don't split package name. * parse.h (octave_base_parser::make_superclass_ref, octave_base_parser::make_meta_class_query): Remove package_nm argument. * pt-classdef.h (tree_classdef_superclass::id, tree_classdef_superclass::pkg): Removed members, replaced by cls_name. (tree_classdef_superclass::~tree_classdef_superclass): Remove deletion of removed members. (tree_classdef_superclass::cls_name): New member. (tree_classdef_superclass::tree_classdef_superclass): Initialize it. (tree_classdef_superclass::ident, tree_classdef_superclass::package): Removed methods. (tree_classdef_superclass::class_name): New method. * token.h (token::meta_name_token): Remove enum value. (token(int, std::string, std::string, std::string, int, int)): Remove constructor. (token::superclass_package_name, token::meta_package_name, token::meta_class_name): Remove methods. (token::sc::package_nm, token::mc): Remove union members. * token.cc (token(int, std::string, std::string, std::string, int, int)): Remove constructor. (token::~token): Remove case of meta_name_token. (token::superclass_package_name, token::meta_package_name, token::meta_class_name): Remove methods. * oct-parse.in.yy (FQ_IDENT): New terminal. (superclass_identifier): Adapt to changes in class token and class octave_base_parser. (meta_identifier): Likewise. (superclass_list): Add mid-rule to enable fully-qualified identifier. (superclass): Use FQ_IDENT. (octave_base_parser::make_superclass_ref, octave_base_parser::make_meta_class_query): Remove package_nm argument. * ov-classdef.cc (octave_classdef_superclass_ref::do_multi_index_op): Adapt to removal of package_nm argument. (F__meta_class_query__): Likewise. (cdef_class::make_meta_class): Adapt to changes in class tree_classdef_superclass.

/*

Copyright (C) 1996-2013 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 3 of the License, 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, see
<http://www.gnu.org/licenses/>.

*/

#ifdef HAVE_CONFIG_H
#include <config.h>
#endif

#include <iostream>
#include <string>

#include "error.h"
#include "pager.h"
#include "oct-lvalue.h"
#include "ov.h"
#include "pt-exp.h"

// Expressions.

bool
tree_expression::is_logically_true (const char *warn_for)
{
  bool expr_value = false;

  octave_value t1 = rvalue1 ();

  if (! error_state)
    {
      if (t1.is_defined ())
        return t1.is_true ();
      else
        ::error ("%s: undefined value used in conditional expression",
                 warn_for);
    }

  return expr_value;
}

octave_value
tree_expression::rvalue1 (int)
{
  ::error ("invalid rvalue function called in expression");
  return octave_value ();
}

octave_value_list
tree_expression::rvalue (int)
{
  ::error ("invalid rvalue function called in expression");
  return octave_value_list ();
}

octave_value_list
tree_expression::rvalue (int nargout, const std::list<octave_lvalue> *)
{
  return rvalue (nargout);
}

octave_lvalue
tree_expression::lvalue (void)
{
  ::error ("invalid lvalue function called in expression");
  return octave_lvalue ();
}

std::string
tree_expression::original_text (void) const
{
  return std::string ();
}