Support TeX elements in FreeType renderer. * libinterp/corefcn/txt-eng.cc: New file. Contains mapping from symbol name to character code, in Unicode and MS symbol. * libinterp/corefcn/modules.mk (COREFCN_SRC): Add txt-eng.cc. * libinterp/corefcn/oct-tex-lexer.ll: Add "\n" to rules applicable to ".", as the latter does not include new line characters. * libinterp/corefcn/oct-tex-parser.yy: Remove debug statements. * libinterp/corefcn/txt-eng.ft.cc (gripe_missing_glyph, gripe_glyph_render): Change signature from char to FT_ULong. (ft_render::ft_render): Adapt to new/removed members. (ft_render::~ft_render): Remove use of fonts member. (ft_render::set_font): Likewise. Use font instead. (ft_render::push_new_line): Likewise. Change meaning of yoffset and initialize line_yoffset. (ft_render::update_line_bbox): New method. (ft_render::set_mode): Change meaning of yoffset and initialize line_yoffset. (ft_render::process_character): New method. (ft_render::visit(text_element_string)): Use it. (ft_render::visit(text_element_list), ft_render::visit(text_element_subscript), ft_render::visit(text_element_superscript), ft_render::visit(text_element_color), ft_render::visit(text_element_fontsize), ft_render::visit(text_element_fontname), ft_render::visit(text_element_fontstyle), ft_render::visit(text_element_symbol)): New methods. (ft_render::set_color): Use color member instead of red/green/blue. * libinterp/corefcn/txt-eng-ft.h (ft_render::visit(text_element_list), ft_render::visit(text_element_subscript), ft_render::visit(text_element_superscript), ft_render::visit(text_element_color), ft_render::visit(text_element_fontsize), ft_render::visit(text_element_fontname), ft_render::visit(text_element_fontstyle), ft_render::visit(text_element_symbol)): New methods. (ft_render::update_line_bbox, ft_render::process_character): New methods. (ft_render::current_face): Removed method.i (ft_render::font): New member, replaces obsolete ft_render::fonts. (ft_render::line_yoffset): New member. (ft_render::color): New member, replaces obsolete red, green and blue. (ft_render::ft_font::ft_font()): Implement default constructor. (ft_render::ft_font::operator=): Fix incorrect use of FT_Reference_Face return value. (ft_render::ft_font::is_valid): New method. * libinterp/corefcn/txt-eng.h (class text_element_symbol, class text_element_fontname, class text_element_fontsize, class text_element_fontname, class text_element_fontstyle, class text_element_color): Add forward definition. (text_element_symbol::invalid_code): New enum. (text_element_symbol::code): New member. (text_element_symbol::text_element_symbol): Initialize it. (text_element_symbol::get_symbol_code): New method. (text_element_fontstyle::get_fontstyle): New method. (text_element_fontname::get_fontname): Renamed from fontname. (text_element_fontsize::get_fontsize): Renamed from fontsize.

#! /usr/bin/perl -w
#
# Copyright (C) 2012 Rik Wehbring
#
# 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/>.

## Expecting arguments in this order:
##
##  SRCDIR SRCDIR-FILES ... -- LOCAL-FILES ...

unless (@ARGV >= 2) { die "Usage: $0 srcdir m_filename1 ..." ; }

$srcdir = shift (@ARGV) . '/';

print <<__END_OF_MSG__;
### DO NOT EDIT!
###
### This file is generated automatically from Octave source files.
### Edit source files directly and run make to update this file.

__END_OF_MSG__

MFILE: foreach $m_fname (@ARGV)
{
  if ($m_fname eq "--")
  {
    $srcdir = "./";
    next MFILE;
  }

  $full_fname = $srcdir . $m_fname;
  next MFILE unless ( $full_fname =~ m{(.*)/(@|)([^/]*)/(.*)\.m} );
  if ($2)
    { $fcn = "$2$3/$4"; }
  else
    { $fcn = $4; }

  @help_txt = gethelp ($fcn, $full_fname);
  next MFILE if ($help_txt[0] eq "");

  print "\x{1d}$fcn\n";
  print "\@c $fcn scripts/$m_fname\n";

  foreach $_ (@help_txt)
  {
    s/^\s+\@/\@/ unless $in_example;
    s/^\s+\@group/\@group/;
    s/^\s+\@end\s+group/\@end group/;
    $in_example = (/\s*\@example\b/ .. /\s*\@end\s+example\b/);
    print $_;
  }
}

################################################################################
# Subroutines
################################################################################
sub gethelp
{
  ($fcn, $fname) = @_[0..1]; 
  open (FH, $fname) or return "";

  do
  {
    @help_txt = ();

    ## Advance to non-blank line
    while (defined ($_ = <FH>) and /^\s*$/) {;}

    if (! /^\s*(?:#|%)/ or eof (FH))
    {
      ## No comment block found.  Return empty string
      close (FH);
      return "";
    }

    ## Extract help text stopping when comment block ends
    do
    {
      ## Remove comment characters at start of line
      s/^\s*(?:#|%){1,2} ?//;
      push (@help_txt, $_);
    } until (! defined ($_ = <FH>) or ! /^\s*(?:#|%)/);

  } until ($help_txt[0] !~ /^(?:Copyright|Author)/); 

  close (FH);

  return @help_txt;
}