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#!/usr/bin/perl

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

# Separate different commands out (delimiter @)

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

# Get input command and remove all spaces

$cmd = $ARGV[0];

$_   = $cmd;s/\s+//g;$cmd=$_;

$len = length $cmd;

# Split the command string according to logical operators

$nline = 0;

while ( $len > 0 )

{

  # Get the length of the (remaining) command string

  $len = length $cmd; 

  # Get the position of the next command separator

  $at  = index($cmd,'@');

  if ( $at == -1 )

     { $next = $len+1; }

  elsif ( $at >= 0 )

     { $next = $at; }

  # A logical operator is not allowed to be at position 0

  if ( $next == 0) 

     {    

      die('Invalid expression... Check @ separator position ');

     }   

  # Extract the next substring

  $sub = substr($cmd,0,$next);

  $cmd = substr($cmd,$next+1,$len-$next-1);

  $len = length $cmd; 

  # Save the command in a new line

  @field[$nline] = $sub;

  $nline = $nline + 1;

}

# Number of lines ist too large by 1

$nline = $nline - 1;

# Set some defaults

if ( $nline == 2 ) 

   {

    $nline    = 3;

    @field[3] = 'nil';

   }

if ( $nline == 1 ) 

   {

    $nline    = 3;

    @field[2] = 'hPa';

    @field[3] = 'nil';

   }

if ( $nline == 0 ) 

   {

    $nline    = 3;

    @field[1] = 'nil()';

    @field[2] = 'hPa';

    @field[3] = 'nil';

   }

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

# Handle each command line separately

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

# ----- Horizontal grid ----------------------------------

# Now looking at the horizontal grid specifier

$entry = @field[0];

# Extract the command and the parameter list

$left  = index($entry,'(');

$right = index($entry,')');

if ( ($left != -1) && ($right != -1) )

   {

    $cmd  = substr($entry,0,$left);

    $list = substr($entry,$left+1,$right-$left-1);

    $len  = length $list; 

   }

else

   {    

    die('Invalid expression... Check horizontal [] separator position ');

   }   

# Now building the parametr list 

$len  = length $list; 

$npar = 0;

while ( $len > 0 ) 

   {

   $next = index($list,',');

   if ( $next != -1 )

      {

       @param[$npar] = substr($list,0,$next);

       $list         = substr($list,$next+1,$len-$next-1);

       $len          = length $list; 

       $npar         = $npar + 1;

      }

   else

      {

       @param[$npar] = substr($list,0,$len);

       $len          = 0;

       $npar         = $npar + 1;

      }

   }

# Check for syntax (needed number of parameters)

if ( ($cmd eq "file")      && ($npar != 1) ) 

    {  die('Invalid horizontal mode[file]... Check number of parameters ');     }

if ( ($cmd eq "line")      && ($npar != 5) ) 

    {  die('Invalid horizontal mode[line]... Check number of parameters ');     }  

if ( ($cmd eq "box.eqd")   && ($npar != 5) ) 

    {  die('Invalid horizontal mode[box.eqd]... Check number of parameters ');  }  

if ( ($cmd eq "box.grid")  && ($npar != 4) ) 

    {  die('Invalid horizontal mode[box.grid]... Check number of parameters '); }  

if ( ($cmd eq "point")     && ($npar != 2) ) 

    {  die('Invalid horizontal mode[point]... Check number of parameters ');    }  

if ( ($cmd eq "shift")     && ($npar != 4) ) 

    {  die('Invalid horizontal mode[shift]... Check number of parameters ');    }  

if ( ($cmd eq "poly.eqd")  && ($npar != 2) ) 

    {  die('Invalid horizontal mode[poly.eqd]... Check number of parameters '); }  

if ( ($cmd eq "poly.grid") && ($npar != 1) ) 

    {  die('Invalid horizontal mode[poly.grid]... Check number of parameters ');}  

# Write parameters

print "\"$cmd\"\n";

print "@param\n";

# ----- Vertical grid ----------------------------------------

# Now looking at the vertical grid specifier

$entry = @field[1];

# Extract the command and the parameter list

$left  = index($entry,'(');

$right = index($entry,')');

if ( ($left != -1) && ($right != -1) )

   {

    $cmd  = substr($entry,0,$left);

    $list = substr($entry,$left+1,$right-$left-1);

    $len  = length $list; 

   }

else

   {    

    die('Invalid expression... Check vertical [] separator position ');

   }   

# Now building the parametr list 

$len  = length $list; 

$npar = 0;

while ( $len > 0 ) 

   {

   $next = index($list,',');

   if ( $next != -1 )

      {

       @param[$npar] = substr($list,0,$next);

       $list         = substr($list,$next+1,$len-$next-1);

       $len          = length $list; 

       $npar         = $npar + 1;

      }

   else

      {

       @param[$npar] = substr($list,0,$len);

       $len          = 0;

       $npar         = $npar + 1;

      }

   }

# Check for syntax (needed number of parameters)

if ( ($cmd eq "file")      && ($npar != 1) ) 

    {  die('Invalid vertical mode[file]... Check number of parameters ');     }

if ( ($cmd eq "level")     && ($npar != 1) ) 

    {  die('Invalid vertical mode[level]... Check number of parameters ');    }

if ( ($cmd eq "list")      && ($npar == 0) ) 

    {  die('Invalid vertical mode[list]... Check number of parameters ');     }

if ( ($cmd eq "profile")   && ($npar != 3) ) 

    {  die('Invalid vertical mode[profile]... Check number of parameters ');  }

if ( ($cmd eq "grid")      && ($npar != 2) ) 

    {  die('Invalid vertical mode[grid]... Check number of parameters ');     }

# Write parameters

print "\"$cmd\"\n";

if ( $cmd eq "list") { print "$npar\n"; }

if ( $npar > 0 )

      { print "@param\n"; }

# ----- Vertical coordinate system  ----------------------------------

# Now looking at the vertical grid specifier

$cmd = @field[2];

# Check for allowed coordinate axes

if ( ($cmd ne "m") && ($cmd ne "m,agl") && ($cmd ne "hPa")  && ($cmd ne "hPa,agl") && ($cmd ne "K") && ($cmd ne "PVU") && ($cmd ne "INDEX") )

    {  die('Invalid vertical axis [allowed: m / m,agl / hPa / hPa / K / PVU / INDEX] ');     }

# Write command

print "\"$cmd\"\n";

# ----- Selection criteria --------------------------------------------

# Now looking at the selection specifier

$cmd = @field[3];

# Write command

print "$cmd\n";