#!/usr/bin/env perl
#
#  $Id: protex,v 1.1 2004/02/04 04:49:19 edhill Exp $
#
#BOP
#
# !ROUTINE: ProTeX v. 2.00 - Translates DAO Prologues to LaTeX
#
# !INTERFACE:
#         protex [-hbACFS7] ] [+-nlsxf] [src_file(s)]
#
# !DESCRIPTION:
#         Perl filter to produce a \LaTeX compatible document 
#         from a DAO Fortran source code with standard Pro\TeX 
#         prologues. If source files are not specified it
#         reads from stdin; output is always to stdout.
# 
# \noindent        
# {\bf Command Line Switches:} \vspace{0.2cm}
#
# \begin{center}
# \begin{tabular}{|c|l|} \hline \hline
#   -h   & Help mode: list command line options   \\ \hline
#   -b   & Bare mode, meaning no preamble, etc.  \\ \hline
#   -i   & internal mode: omit prologues marked !BOPI  \\ \hline
#   +/-n & New Page for each subsection (wastes paper) \\ \hline
#   +/-l & Listing mode, default is prologues only \\ \hline
#   +/-s & Shut-up mode, i.e., ignore any code from BOC to EOC \\ \hline
#   +/-x & No LaTeX mode, i.e., put !DESCRIPTION: in verbatim mode \\ \hline
#   +/-f & No source file info \\ \hline
#   -A   & Ada code \\ \hline
#   -C   & C++ code \\ \hline
#   -F   & F90 code (default) \\ \hline
#   -7   & F77 code \\ \hline
#   -S   & Shell script \\ \hline \hline
# \end{tabular}
# \end{center}
#
# The options can appear in any order.  The options, -h and -b, affect
# the input from all files listed on command-line input.  Each of the
# remaining options effects only the input from the files listed after
# the option and prior to any overriding option.  The plus sign
# turns off the option.  For example, the command-line input,
# \bv
#      protex -bnS File1 -F File2.f +n File3.f
# \ev
# will cause the option, {\tt -n} to affect the input from the files,
# {\tt File} and {\tt File2.f}, but not from {\tt File3.f}.  The
# {\tt -S} option is implemented for {\tt File1} but is overridden by
# the {\tt -F} for files {\tt File2.f} and {\tt File3.f}.
#
#
# !SEE ALSO:
#         For a more detailed description of ProTeX functionality,
#         DAO Prologue and other conventions, consult:
#
#           Sawyer, W., and A. da Silva, 1997: ProTeX: A Sample 
#           Fortran 90 Source Code Documentation System.
#           DAO Office Note 97-11
#         
#
# !REVISION HISTORY:
#
#  20Dec1995  da Silva  First experimental version
#  10Nov1996  da Silva  First internal release (v1.01)
#  28Jun1997  da Silva  Modified so that !DESCRIPTION can appear after
#             !INTERFACE, and !INPUT PARAMETERS etc. changed to italics.
#  02Jul1997  Sawyer    Added shut-up mode
#  20Oct1997  Sawyer    Added support for shell scripts
#  11Mar1998  Sawyer    Added: file name, date in header, C, script support
#  05Aug1998  Sawyer    Fixed LPChang-bug-support-for-files-with-underscores
#  10Oct1998  da Silva  Introduced -f option for removing source file info
#                       from subsection, etc.  Added help (WS).
#  06Dec1999  C. Redder Added LaTeX command "\label{sec:prologues}" just 
#                       after the beginning of the proglogue section.
#  13Dec1999  C. Redder Increased flexbility in command-line
#                       interface.  The options can appear in any
#                       order which will allow the user to implement
#                       options for select files.
#  01Feb1999  C. Redder Added \usepackage commands to preamble of latex
#                       document to include the packages amsmath, epsfig
#                       and hangcaption.
#  10May2000  C. Redder Revised LaTeX command "\label{sec:prologues}"
#                       to "\label{app:ProLogues}"
#  10/10/2002 da Silva  Introduced ARGUMENTS keyword, touch ups.
#
#  15Jan2003  R. Staufer  Modified table of contents to print only section headers - no descriptions
#
#  25Feb2003  R. Staufer  Added BOPI/EOPI and -i (internal) switch to provide the option of omitting prologue information from output files.
#
#EOP
#----------------------------------------------------------------------------

# Keep this if you don't know what it does...
# -------------------------------------------
  $[ = 1;                 # set array base to 1
  $, = ' ';               # set output field separator
  $\ = "\n";              # set output record separator

# Set valid options lists
# -----------------------
  $GlobOptions = 'hb';    # Global options (i.e for all files)
  $LangOptions = 'ACFS7';  # Options for setting programming languages
  $SwOptions   = 'flinsx'; # Options that can change for each input 
                          #   file
  $RegOptions  = "$GlobOptions$LangOptions";
                          # Scan for global options until first first
                          #   file is processed.

# Scan for global options
# -----------------------
  $NFiles = 0;
Arg:
  foreach $arg (@ARGV) {
     $option = &CheckOpts ( $arg, $RegOptions, $SwOptions ) + 1;
     if ( $option ) {
        $rc = &GetOpts    ( $arg, $GlobOptions );
         next Arg; }

     else { $NFiles++;
}#   end if
}# end foreach

# If all input arguments are options, then assume the
# filename, "-", for the standard input
# --------------------------------------------------
  if ( $NFiles == 0 ) { push (@ARGV, "-"); } 

# Implement help option
# ---------------------
  if ( $opt_h ) {
     &print_help();
      exit();
}#end if

# Optional Prologue Keywords
# --------------------------
  @keys = ( "!INTERFACE:",
            "!USES:",
            "!PUBLIC TYPES:",
            "!PRIVATE TYPES:",
            "!PUBLIC MEMBER FUNCTIONS:",
            "!PRIVATE MEMBER FUNCTIONS:",
            "!PUBLIC DATA MEMBERS:",
            "!PARAMETERS:",
            "!ARGUMENTS:",
            "!DEFINED PARAMETERS:",
            "!INPUT PARAMETERS:",
            "!INPUT/OUTPUT PARAMETERS:",
            "!OUTPUT PARAMETERS:",
            "!RETURN VALUE:",
            "!REVISION HISTORY:",
            "!BUGS:",
            "!SEE ALSO:",
            "!SYSTEM ROUTINES:",
            "!FILES USED:",
            "!REMARKS:",
            "!TO DO:",
            "!CALLING SEQUENCE:",
            "!AUTHOR:",
            "!CALLED FROM:",
            "!LOCAL VARIABLES:" );

# Initialize these for clarity
# ----------------------------
  $intro = 0;             # doing introduction?
  $prologue = 0;          # doing prologue?
  $first = 1;             # first prologue?
  $source = 0;            # source code mode?
  $verb = 0;              # verbatim mode?
  $tpage = 0;             # title page?
  $begdoc = 0;            # has \begin{document} been written?

# Initial LaTeX stuff
# -------------------
  &print_notice();
  &print_preamble();      # \documentclass, text dimensions, etc.
  &print_macros();        # short-hand LaTeX macros

# Main loop -- for each command-line argument
# -------------------------------------------
ARG:
  foreach $arg (@ARGV) {

#    Scan for non-global command-line options
#    ----------------------------------------
     $option = &CheckOpts ( $arg, $RegOptions, $SwOptions, "quiet" ) + 1;
     if ( $option ) {
        &GetOpts  ( $arg, $SwOptions   );
        &SetOpt   ( $arg, $LangOptions );
        next ARG;

}#   end if

#    Determine the type of code, set corresponding search strings
#    ------------------------------------------------------------
#    if ( $opt_F ) {            # FORTRAN
        $comment_string = '!';  # -------
        $boi_string = '!BOI';
        $eoi_string = '!EOI';
        $bop_string = '!BOP';
        $eop_string = '!EOP';
        $bopi_string = '!BOPI';
        $eopi_string = '!EOPI';
        $boc_string = '!BOC';
        $eoc_string = '!EOC';
#}#   end if

     if ( $opt_7 ) {            # f77
        $comment_string = 'C';  # ---
        $boi_string = 'CBOI';
        $eoi_string = 'CEOI';
        $bop_string = 'CBOP';
        $eop_string = 'CEOP';
        $bopi_string = 'CBOPI';
        $eopi_string = 'CEOPI';
        $boc_string = 'CBOC';
        $eoc_string = 'CEOC';
}#   end if

     if ( $opt_A ) {            # ADA
        $comment_string = '--'; # ---
        $boi_string = '--BOI';
        $eoi_string = '--EOI';
        $bop_string = '--BOP';
        $eop_string = '--EOP';
        $bopi_string = '--BOPI';
        $eopi_string = '--EOPI';
        $boc_string = '--BOC';
        $eoc_string = '--EOC';
}#   end if

     if ( $opt_C ) {
        $comment_string = '//'; # C 
        $boi_string = '//BOI';  # -
        $eoi_string = '//EOI';
        $bop_string = '//BOP';
        $eop_string = '//EOP';
        $bopi_string = '//BOPI';
        $eopi_string = '//EOPI';
        $boc_string = '//BOC';
        $eoc_string = '//EOC';
}#   end if

     if ( $opt_S ) {            # Script
        $comment_string = '#';  # ------
        $boi_string = '#BOI';
        $eoi_string = '#EOI';
        $bop_string = '#BOP';
        $eop_string = '#EOP';
        $bopi_string = '#BOPI'; 
	$eopi_string = '#EOPI';
        $boc_string = '#BOC';
        $eoc_string = '#EOC';
}#   end if

#    Set file name parameters
#    ------------------------
     $InputFile           = $arg;
     @all_path_components = split( /\//, $InputFile     );
     $FileBaseName        = pop  ( @all_path_components );
     $FileBaseName        =~ s/_/\\_/g;
     if ( $InputFile eq "-" ) {$FileBaseName = "Standard Input";}

#    Set date
#    --------
     $Date                = `date`;

#    Open current file
#    -----------------
     open ( InputFile, "$InputFile" )
          or print STDERR "Unable to open $InputFile: $!";

#    Print page header
#    -----------------
     printf "\n\\markboth{Left}{Source File: %s,  Date: %s}\n\n",
                               $FileBaseName,    $Date;

LINE:
#    Inner loop --- for processing each line of the input file
#    ---------------------------------------------------------
     while ( <InputFile> ) {
        chop;     # strip record separator

#       !PARAMETERS: really mean !ARGUMENTS:
#       ------------------------------------
#        s/!PARAMETERS:/!ARGUMENTS:/g;

        @Fld = split(' ', $_, 9999);

#       Straight quote
#       --------------
        if ($Fld[1] eq '!QUOTE:') {
           for ($i = 2; $i <= $#Fld; $i++) {
               printf '%s ', $Fld[$i];
}#         end for
           print " ";
           next LINE;
}#      end if

#       Handle optional Title Page and Introduction
#       -------------------------------------------
        if ($Fld[1] eq $boi_string) {
           print ' ';
           $intro = 1;
           next LINE;
}#      end if

        if ($Fld[2] eq '!TITLE:') {
           if ( $intro ) {
              shift @Fld;
              shift @Fld;
              @title = @Fld;
              $tpage = 1;
              next LINE;
}#         end if
}#      end if

        if ($Fld[2] eq '!AUTHORS:') {
           if ( $intro ) {
              shift @Fld;
              shift @Fld;
              @author = @Fld;
              $tpage = 1;
              next LINE;
}#         end if
}#      end if

        if ($Fld[2] eq '!AFFILIATION:') {
           if ( $intro ) {
              shift @Fld;
              shift @Fld;
              @affiliation = @Fld;
              $tpage = 1;
              next LINE;
}#         end if
}#      end if

        if ($Fld[2] eq '!DATE:') {
           if ( $intro ) {
              shift @Fld;
              shift @Fld;
              @date = @Fld;
              $tpage = 1;
              next LINE;
}#         end if
}#      end if

        if ($Fld[2] eq '!INTRODUCTION:') {
           if ( $intro ) {
              &do_beg();
              print ' ';
              print '%..............................................';
              shift @Fld;
              shift @Fld;
              print "\\section{@Fld}";
              next LINE;
}#         end if
}#      end if


#       End of introduction
#       -------------------
        if ($Fld[1] eq $eoi_string) {
           print ' ';
           print '%/////////////////////////////////////////////////////////////';
           print "\\newpage";
           $intro = 0;
           next LINE;
}#      end if

#       Beginning of prologue
#       ---------------------
        if ($Fld[1] eq $bop_string) {
           if ( $source ) { &do_eoc(); }
           print ' ';
           print '%/////////////////////////////////////////////////////////////'; 
           &do_beg();
           if ($first == 0) {
              ### print "\\newpage";
              print " ";
              print "\\mbox{}\\hrulefill\\ ";
              print " ";}
           else {
              unless($opt_b){print "\\section{Routine/Function Prologues} \\label{app:ProLogues}";}
}#         end if
	
           $first = 0;
           $prologue = 1;
           $verb = 0;
           $source = 0;
           &set_missing();   # no required keyword yet
           next LINE;
}#     end if

#	Beginning of internal prologue
#	------------------------------
	if ($Fld[1] eq $bopi_string) {
	   if ($opt_i) {$prologue = 0;}
           else {
              if ($source) { &do_eoc(); }
              print ' ';
              print '%/////////////////////////////////////////////////////////////';  
              &do_beg();
              if ($first ==0) {
                 ### print "\\newpage";
                 print " ";
                 print "\\mbox{}\\hrulefill\\";
                 print " ";}
              else {
                 unless($opt_b){print "\\section{Routine/Function Prologues} \\label{app:ProLogues}";}
}#            endif              
              $first = 0;
              $prologue = 1;
              $verb = 0;
              $source = 0;
              &set_missing();    # no required keyword yet
              next LINE;
           }#   endelse 
        }#    endif

#       A new subroutine/function
#       -------------------------
        if ($Fld[2] eq '!ROUTINE:' ) { 
           if ($prologue) {
              shift @Fld;
              shift @Fld;
              $_ = join(' ', @Fld);
              $name_is = $_;
              s/_/\\_/g;                         # Replace "_" with "\_"
              if ( $opt_n && $not_first ) { printf "\\newpage\n"; }
              unless ($opt_f) {printf "\\subsubsection{%s (Source File: %s)}\n\n", $_, $FileBaseName;}
              else            {printf "\\subsubsection{%s }\n\n", $_;}
              $have_name = 1;
              $not_first = 1;
              next LINE;
}#         end if
}#      end if

#       A new Module
#       ------------
        if ($Fld[2] eq '!MODULE:' ) { 
           if ($prologue) {
              shift @Fld;
              shift @Fld;
              $_ = join(' ', @Fld);
              $name_is = $_;
              s/_/\\_/g;                         # Replace "_" with "\_"
              if ( $opt_n && $not_first ) { printf "\\newpage\n"; }
              unless($opt_f) {printf "\\subsection{Fortran:  Module Interface %s (Source File: %s)}\n\n", $_, $FileBaseName;}
              else           {printf "\\subsection{Fortran:  Module Interface %s }\n\n", $_;}
              $have_name = 1;
              $have_intf = 1;  # fake it, it does not need one.
              $not_first = 1;
              next LINE;
}#         end if
}#      end if

#       A new include file
#       ------------------
        if ($Fld[2] eq '!INCLUDE:' ) { 
           if ($prologue) {
              shift @Fld;
              shift @Fld;
              $_ = join(' ', @Fld);
              $name_is = $_;
              s/_/\\_/g;                         # Replace "_" with "\_"
              if ( $opt_n && $not_first ) { printf "\\newpage\n"; }
              unless($opt_f) {printf "\\subsubsection{Include File %s (Source File: %s)}\n\n", $_, $FileBaseName;}
              else           {printf "\\subsubsection{Include File %s }\n\n", $_;}  
              $have_name = 1;
              $have_intf = 1;  # fake it, it does not need one.
              $not_first = 1;
              next LINE;
}#         end if
}#      end if

#       A new INTERNAL subroutine/function
#       ----------------------------------
        if ($Fld[2] eq '!IROUTINE:') {            # Internal routine
           if ($prologue) {
              shift @Fld;
              shift @Fld;
              $_ = join(' ', @Fld);
              $name_is = $_;
              s/_/\\_/g;                        # Replace "_" with "\_"
	      @words = split " ", $_;
              printf "\\subsubsection [$words[1]] {$_}\n\n";
              $have_name = 1;
              next LINE;
}#         end if
}#      end if

#       A new CLASS
#       ------------
        if ($Fld[2] eq '!CLASS:' ) { 
           if ($prologue) {
              shift @Fld;
              shift @Fld;
              $_ = join(' ', @Fld);
              $name_is = $_;
              s/_/\\_/g;                         # Replace "_" with "\_"
              if ( $opt_n && $not_first ) { printf "\\newpage\n"; }
              unless($opt_f) {printf "\\subsection{C++:  Class Interface %s (Source File: %s)}\n\n", $_, $FileBaseName;}
              else           {printf "\\subsection{C++:  Class Interface %s }\n\n", $_;}
              $have_name = 1;
              $have_intf = 1;  # fake it, it does not need one.
              $not_first = 1;
              next LINE;
}#         end if
}#      end if

#       A new Method
#       -------------------------
        if ($Fld[2] eq '!METHOD:' ) { 
           if ($prologue) {
              shift @Fld;
              shift @Fld;
              $_ = join(' ', @Fld);
              $name_is = $_;
              s/_/\\_/g;                         # Replace "_" with "\_"
              if ( $opt_n && $not_first ) { printf "\\newpage\n"; }
              unless ($opt_f) {printf "\\subsubsection{%s (Source File: %s)}\n\n", $_, $FileBaseName;}
              else            {printf "\\subsubsection{%s }\n\n", $_;}
              $have_name = 1;
              $not_first = 1;
              next LINE;
}#         end if
}#      end if

#       A new function
#       -------------------------
        if ($Fld[2] eq '!FUNCTION:' ) { 
           if ($prologue) {
              shift @Fld;
              shift @Fld;
              $_ = join(' ', @Fld);
              $name_is = $_;
              s/_/\\_/g;                         # Replace "_" with "\_"
              if ( $opt_n && $not_first ) { printf "\\newpage\n"; }
              unless ($opt_f) {printf "\\subsubsection{%s (Source File: %s)}\n\n", $_, $FileBaseName;}
              else            {printf "\\subsubsection{%s }\n\n", $_;}
              $have_name = 1;
              $not_first = 1;
              next LINE;
}#         end if
}#      end if

#       Description: what follows will be regular LaTeX (no verbatim)
#       -------------------------------------------------------------
        if (/!DESCRIPTION:/) {
           if ($prologue) {
              if ($verb) {
                 printf "\\end{verbatim}";
                 printf "\n{\\sf DESCRIPTION:\\\\ }\n\n";
                 $verb = 0; }
              else {                          # probably never occurs
}#            end if
              if ($opt_x) {
                 printf "\\begin{verbatim} ";
                 $verb = 1;
                 $first_verb = 1; }
              else {
                 for ($i = 3; $i <= $#Fld; $i++) {
                    printf '%s ', $Fld[$i];
}#               end for
}#            end if
              ### print " ";
              $have_desc = 1;
              next LINE;
}#         end if
}#      end if

#       Handle optional keywords (these will appear as verbatim)
#       --------------------------------------------------------
        if ($prologue) {
KEY:       foreach $key ( @keys ) {
              if ( /$key/ ) {
                 if ($verb) {
                    printf "\\end{verbatim}";
                    $verb = 0; }
                 else {
                    printf "\n\\bigskip";
}#               end if
                 $k = sprintf('%s', $key);
                 $ln = length($k);
                 ###printf "\\subsubsection*{%s}\n", substr($k, 2, $ln - 1);
                 ###printf "{\\Large \\em %s}\n", ucfirst lc substr($k, 2, $ln - 1);
                 $_ = $key;
                if( /USES/ || /INPUT/ || /OUTPUT/ || /PARAMETERS/ || 
                    /VALUE/  || /ARGUMENTS/ ) {
                    printf "{\\em %s}\n", substr($k, 2, $ln - 1); } # italics
                 else {
                    printf "{\\sf %s}\n", substr($k, 2, $ln - 1); # san serif
}#               end if

                 printf "\\begin{verbatim} ";
                 $verb = 1;
                 $first_verb = 1;
                 if ( $key eq "!INTERFACE:" )        { $have_intf = 1; }
                 if ( $key eq "!CALLING SEQUENCE:" ) { $have_intf = 1; }
                 if ( $key eq "!REVISION HISTORY:" ) { $have_hist = 1; }
                 next LINE;
}#            end if
}#         end foreach
}#      end if

#       End of prologue
#       ---------------
        if ($Fld[1] eq $eop_string) {
           if ($verb) {
              print "\\end{verbatim}";
              $verb = 0;
}#         end if
           $prologue = 0;
#           &check_if_all_there(); # check if all required keywords are there.
           if ( $opt_l ) {
              $Fld[1] = $boc_string;}
           else { next LINE; }
}#      end if

        unless ( $opt_s ) {

#       End of Internal Prologue
#	------------------------

	if ($Fld[1] eq $eopi_string) {
           if ($verb) {
              print "\\end{verbatim}";
              $verb = 0;
}#         endif
           $prologue = 0;
#          &check_if_all_there(); # check if all required keywords are there.
           if ($opt_l) {
              $Fld[1] = $boc_string;}
           else { next LINE; }
}#       endif

#
#          Beginning of source code section
#          --------------------------------
           if ($Fld[1] eq $boc_string) {
              print ' ';
              print '%/////////////////////////////////////////////////////////////';
              $first = 0;
              $prologue = 0;
              $source = 1;
              ### printf "\\subsubsection*{CONTENTS:}\n\n", $Fld[3];
              printf "{\\sf CONTENTS:}";
              printf "\n \\begin{verbatim}\n";
              $verb = 1;
              next LINE;
}#         end if

#          End of source code
#          ------------------
           if ($Fld[1] eq $eoc_string) {
              &do_eoc();
              $prologue = 0;
              next LINE;
}#         end if
}#      end unless
   
#   Prologue or Introduction, print regular line (except for !)
#   -----------------------------------------------------------
    if ($prologue||$intro) {
        if ( $verb && $#Fld == 1 && ( $Fld[1] eq $comment_string ) ) {
           next LINE;                # to eliminate excessive blanks 
}#      end if
        if ( $Fld[2] eq "\\ev" ) {   # special handling
           $_ = $comment_string . " \\end{verbatim}";
}#      end if
        s/^$comment_string/ /;       # replace comment string with blank
#       $line = sprintf('%s', $_);   # not necessary -- comment str is absent
#       $ln = length($line);         # not necessary -- comment str is absent
        unless ( $first_verb ) { printf "\n "; }
        printf '%s', $_;
#       printf '%s', substr($line, 1, $ln - 1);     # comment str is absent
        $first_verb = 0;
        next LINE;
}#  end if

#   Source code: print the full line
#   --------------------------------
    if ($source) {
        print $_;
        next LINE;
}#  end if

}#   end inner loop for processing each line of the input file
 #   ---------------------------------------------------------

}# end main loop for each command-line argument
 # --------------------------------------------
  print $_;
  if ( $source ) { &do_eoc(); }     
  print '%...............................................................';
 
  # see comment above where these are originally set.
  #print "\\setlength{\\parskip}{\\oldparskip}";
  #print "\\setlength{\\parindent}{\\oldparindent}";
  #print "\\setlength{\\baselineskip}{\\oldbaselineskip}";

  unless ( $opt_b ) {
     print "\\end{document}";
}#end unless


#----------------------------------------------------------------------

  sub CheckOpts
#    Checks options against a given list.  Outputs error message
#    for any invalid option.
#
#    Usage:
#       $rc = &CheckOpts ( options, valid_reg_options,
#                                   valid_sw_options,
#                                   quiet_mode )
#
#       character: options - options to be checked. (e.g. -df+x)  The
#                            list must begin with a positive or
#                            negative sign.  If no sign appears at the
#                            beginning or by itself, then the argument
#                            is not recognized as a list of options.
#       character: valid_reg_options - list of valid regular options.
#                            (i.e. options that are associated only
#                            eith negative sign.)
#       character: valid_sw_options - list of valid switch options.
#                            (i.e. options that can be associated with
#                            either a positive or negative sign.
#       logical:   quiet mode (optional) If true then print no error
#                            messages.
#       integer:   rc      - return code
#                            = -1 if the arguement, options, is
#                               not recognized as a list of options
#                            =  0 if all options are valid.
#                            >  0 for the number of invalid options.
# 
{    local($options,
           $valid_reg_options,
           $valid_sw_options,
           $quiet_mode ) = @_;

     if ( $options eq "+" ||
          $options eq "-" ) {return -1}

     local(@Options) = split( / */, $options );
     if ( $Options[ $[ ] ne "-" &&
          $Options[ $[ ] ne "+" ) {return -1;}

     local($option, $option_sign, $valid_list, $pos);
     local($errs)    = 0;
     foreach $option ( @Options ) {
        if ( $option eq "-" ||
             $option eq "+" ) {$option_sign = $option;}
        else {
           if ( $option_sign eq "-" )
              { $valid_list = $valid_reg_options
                            . $valid_sw_options; }
           else
              { $valid_list = $valid_sw_options; }
           $pos = index ($valid_list,$option); 
           if ( $pos < $[ &&
                $quiet_mode ) {
              $errs++;
              print STDERR "Invalid option: $option_sign$option \n"; 

}#         end if
}#      end if
}#   end foreach
     return $errs;

}#end sub GetOpts

  sub GetOpts
#    Gets options.  If an option is valid,  then opt_[option] is
#    set to 0 or 1 as a side effect if the option is preceeded by
#    a positive or negative sign.
#
#    Usage:
#       $rc = &GetOpts ( options, valid_options )
#
#       character: options - options to be checked. (e.g. -df+x)  The
#                            list must begin with a positive or
#                            negative sign.  If no sign appears at the
#                            beginning or by itself, then the argument
#                            is not recognized as a list of options.
#       character: valid_options - list of valid options (e.g. dfhx)
#       integer:   rc      - return code
#                            = -1 if the arguement, options, is
#                               not recognized as a list of options.
#                            =  0 otherwise
# 
{    local($options,$valid_options) = @_;

     if ( $options eq "+" ||
          $options eq "-" ) {return -1}

     local(@Options)       = split( / */, $options );
     if ( $Options[ $[ ] ne "-" &&
          $Options[ $[ ] ne "+" ) {return -1;}

     local($option, $option_sign);

     foreach $option ( @Options ) {

        if ( $option eq "-" ||
             $option eq "+" ) {
           $option_sign = $option; }

        else {

           if ( index ($valid_options,$option) >= $[ ) {
              if ( $option_sign eq "-" ) {${"opt_$option"} = 1;}
              if ( $option_sign eq "+" ) {${"opt_$option"} = 0;};

}#         end if
}#      end if
}#   end foreach

     return 0;
}#end sub GetOpts

  sub SetOpt
#    Sets option flags.  For the last input option that is in a
#    list, the flag opt_[option] is set to 1 as a side effect.
#    For all other options in the list, opt_[option] is set to 0.
#
#    Usage:
#       $rc = &SetOpt ( options, valid_options )
#
#       character: options - options to be checked. (e.g. -df+x)  The
#                            list must begin with a positive or
#                            negative sign.  If no sign appears at the
#                            beginning or by itself, then the argument
#                            is not recognized as a list of options.
#       character: valid_options - list of valid options (e.g. def )
#       integer:   rc      - return code
#                            = -1 if the arguement, options, is
#                               not recognized as a list of options.
#                            =  0 otherwise
#       Note: For the examples provided for the input arguments,
#             $opt_d = 0, $opt_e = 0, and $opt_f = 1, since the 
#             input option, -f, was the last in the argument,
#             option.
# 
{    local($options,$valid_options) = @_;

     if ( $options eq "+" ||
          $options eq "-" ) {return -1}

     local(@Options)       = split( / */, $options       );
     local(@ValidOptions)  = split( / */, $valid_options );
     if ( $Options[ $[ ] ne "-" &&
          $Options[ $[ ] ne "+" ) {return -1;}

     local($option, $option_sign);

     foreach $option ( @Options ) {
        if ( $option ne "-" &&
             $option ne "+" ) {

           if ( index ($valid_options,$option) >= $[ ) {
              foreach $valid_option (@ValidOptions ) {
                 ${"opt_$valid_option"} = 0;

}#            end foreach
              ${"opt_$option"} = 1;
}#         end if
}#      end if
}#   end foreach

  return 0;
}#end sub SetOpt

sub print_help {

    print "Usage:     protex [-hbACFS] [+-nlsxf] [src_file(s)]";
    print " ";
    print " Options:";
    print "     -h   Help mode: list command line options";
    print "     -b   Bare mode, meaning no preamble, etc."; 
    print "     +-n  New Page for each subsection (wastes paper)";
    print "     +-l  Listing mode, default is prologues only";
    print "     +-s  Shut-up mode, i.e., ignore any code from BOC to EOC";
    print "     +-x  No LaTeX mode, i.e., put !DESCRIPTION: in verbatim mode";
    print "     +-f  No source file info";
    print "     -A   Ada code";
    print "     -C   C++ code";
    print "     -F   F90 code";
    print "     -S   Shell script";
    print " ";
    print "  The options can appear in any order.  The options, -h and -b,";
    print "  affect the input from all files listed on command-line input.";
    print "  Each of the remaining options effects only the input from the";
    print "  files listed after the option and prior to any overriding";
    print "  option.  The plus sign turns off the option."; 
}# end sub print_help

sub print_notice {

    print "%                **** IMPORTANT NOTICE *****" ;
    print "% This LaTeX file has been automatically produced by ProTeX v. 1.1";
    print "% Any changes made to this file will likely be lost next time";
    print "% this file is regenerated from its source. Send questions ";
    print "% to Arlindo da Silva, dasilva\@gsfc.nasa.gov";
    print " ";

}# sub print_notice

sub print_preamble {

  unless ( $opt_b ) {
    print "%------------------------ PREAMBLE --------------------------";
    print "\\documentclass[11pt]{article}";
    print "\\usepackage{amsmath}";
    print "\\usepackage{epsfig}";
    print "\\usepackage{hangcaption}";
    print "\\textheight     9in";
    print "\\topmargin      0pt";
    print "\\headsep        1cm";
    print "\\headheight     0pt";
    print "\\textwidth      6in";
    print "\\oddsidemargin  0in";
    print "\\evensidemargin 0in";
    print "\\marginparpush  0pt";
    print "\\pagestyle{myheadings}";
    print "\\markboth{}{}";
    print "%-------------------------------------------------------------";
}#  end unless

    # in your main document before you include any protex-generated files 
    # for the first time, if you define these three variables as length 
    # settings (like this:)
    #   \newlength{\oldparskip}
    #   \newlength{\oldparindent}
    #   \newlength{\oldbaselineskip}
    # then 1) comment in all the lines below, and 2) find the 3 reset lines
    # further down and comment in them as well. 
    # then protex will override the paragraph and skip settings during 
    # the source sections, but will restore the original document settings 
    # at the end.   if someone can figure out how to check to see if a
    # latex variable exists, and do a conditional section, we could make
    # this fully self-contained.
    # nsc feb 2003

    #print "\\setlength{\\oldparskip}{\\parskip}";
    print "\\setlength{\\parskip}{0pt}";
    #print "\\setlength{\\oldparindent}{\\parindent}";
    print "\\setlength{\\parindent}{0pt}";
    #print "\\setlength{\\oldbaselineskip}{\\baselineskip}";
    print "\\setlength{\\baselineskip}{11pt}";

}# end sub print_preamble

sub print_macros {

    print " ";
    print "%--------------------- SHORT-HAND MACROS ----------------------";
    print "\\def\\bv{\\begin{verbatim}}";
    print "\\def\\ev\{\\end\{verbatim}}";
    print "\\def\\be{\\begin{equation}}";
    print "\\def\\ee{\\end{equation}}";
    print "\\def\\bea{\\begin{eqnarray}}";
    print "\\def\\eea{\\end{eqnarray}}";
    print "\\def\\bi{\\begin{itemize}}";
    print "\\def\\ei{\\end{itemize}}";
    print "\\def\\bn{\\begin{enumerate}}";
    print "\\def\\en{\\end{enumerate}}";
    print "\\def\\bd{\\begin{description}}";
    print "\\def\\ed{\\end{description}}";
    print "\\def\\({\\left (}";
    print "\\def\\){\\right )}";
    print "\\def\\[{\\left [}";
    print "\\def\\]{\\right ]}";
    print "\\def\\<{\\left  \\langle}";
    print "\\def\\>{\\right \\rangle}";
    print "\\def\\cI{{\\cal I}}";
    print "\\def\\diag{\\mathop{\\rm diag}}";
    print "\\def\\tr{\\mathop{\\rm tr}}";
    print "%-------------------------------------------------------------";

}# end sub print_macros

sub do_beg {
    unless ( $opt_b ) {
    if ( $begdoc == 0 ) {
        if ( $tpage ) {
            print "\\title{@title}";
            print "\\author{{\\sc @author}\\\\ {\\em @affiliation}}";
            print "\\date{@date}";
        }
        print "\\begin{document}";
        if ( $tpage ) {
            print "\\maketitle";
        }
        print "\\tableofcontents";
        print "\\newpage";
        $begdoc = 1;
     }
  }
}# end sub do_beg

sub do_eoc {
        print ' ';
        if ($verb) {
            print "\\end{verbatim}";
            $verb = 0;
        }
        $source = 0;
}# end sub do_eoc

sub set_missing {

  $have_name = 0;      # have routine name?
  $have_desc = 0;      # have description?
  $have_intf = 0;      # have interface?
  $have_hist = 0;      # have revision history?
  $name_is = "UNKNOWN";

}# end sub set_missing

    
sub check_if_all_there {

$have_name || 
die "ProTeX: invalid prologue, missing !ROUTINE: or !IROUTINE: in <$name_is>";

$have_desc || 
die "ProTeX: invalid prologue, missing !DESCRIPTION: in <$name_is>";

$have_intf || 
die "ProTeX: invalid prologue, missing !INTERFACE: in <$name_is>";

$have_hist || 
 die "ProTeX: invalid prologue, missing !REVISION HISTORY: in <$name_is>";

}# end sub check_if_all_there