Add simple TeX parser based on flex/bison. * libinterp/corefcn/oct-tex-lexer.ll, libinterp/corefcn/oct-tex-pareser.yy: New files. * libinterp/Makefile.am (BUILT_SOURCES): Add oct-tex-lexer.cc and oct-tex-parser.cc. * libinterp/corefcn/modules.mk (corefcn/oct-tex-lexer.cc, corefcn/oct-tex-parser.h): New rules. * libinterp/corefcn/txt-eng-ft.h (ft_render::text_to_pixels, ft_render::get_extent): Add interpreter argument. * libinterp/corefcn/txt-eng-ft.cc (ft_render::text_to_pixels, ft_render::get_extent): Likewise. Use text_parser::parse(). * libinterp/corefcn/gl-render.cc (opengl_renderer::text_to_pixels): Use new interpreter argument. * libinterp/corefcn/graphics.cc (axes::properties::get_ticklabel_extents): Likewise. (uicontrol::properties::update_text_extent): Use text_parser::parse. * libinterp/corefcn/txt-eng.h (memory, string, caseless-str.h, dMatrix.h): New includes. (class text_element_subscript): Renamed from text_subscript_element. (class text_element_supserscript): Renamed from text_superscript_element. (class text_element_symbol, class text_element_fontstyle, class text_element_fontname, class text_element_fontsize, class text_element_color): New classes. (text_element_list::text_element_list(text_element*)): New constructor. (text_element_subscript::text_element_subscript(text_element*), text_element_subscript::text_element::subscript(char)): New constructors. (text_element_subscript::elem): New member. (text_element_subscript::get_element): New method. Returns it. (text_element_subscript::~text_element_subscript): New destructor. Delete it. (text_element_subscript::text_element_subscript()): Make default constructor private. (text_element_superscript::text_element_superscript(text_element*), text_element_superscript::text_element::superscript(char)): New constructors. (text_element_superscript::elem): New member. (text_element_superscript::get_element): New method. Returns it. (text_element_superscript::~text_element_superscript): New destructor. Delete it. (text_element_superscript::text_element_superscript()): Make default constructor private. (text_processor::visit(text_element_symbol), text_processor::visit(text_element_fontstyle), text_processor::visit(text_element_fontname), text_processor::visit(text_element_fontsize), text_processor::visit(text_element_color)): New methods. (text_parser::parse): New static method. (class text_parser_tex): New class.

/*

Copyright (C) 2000-2012 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 "lo-utils.h"
#include "singleton-cleanup.h"

#include "comment-list.h"
#include "error.h"

octave_comment_buffer *octave_comment_buffer::instance = 0;

octave_comment_list *
octave_comment_list::dup (void) const
{
  octave_comment_list *new_cl = new octave_comment_list ();

  for (const_iterator p = begin (); p != end (); p++)
    {
      const octave_comment_elt elt = *p;

      new_cl->append (elt);
    }

  return new_cl;
}

bool
octave_comment_buffer::instance_ok (void)
{
  bool retval = true;

  if (! instance)
    {
      instance = new octave_comment_buffer ();

      if (instance)
        singleton_cleanup_list::add (cleanup_instance);
    }

  if (! instance)
    {
      ::error ("unable to create comment buffer object");

      retval = false;
    }

  return retval;
}

void
octave_comment_buffer::append (const std::string& s,
                               octave_comment_elt::comment_type t)
{
  if (instance_ok ())
    instance->do_append (s, t);
}

octave_comment_list *
octave_comment_buffer::get_comment (void)
{
  return (instance_ok ()) ? instance->do_get_comment () : 0;
}

void
octave_comment_buffer::do_append (const std::string& s,
                                  octave_comment_elt::comment_type t)
{
  comment_list->append (s, t);
}

octave_comment_list *
octave_comment_buffer::do_get_comment (void)
{
  octave_comment_list *retval = 0;

  if (comment_list && comment_list->length () > 0)
    {
      retval = comment_list;
      comment_list = new octave_comment_list ();
    }

  return retval;
}