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    1: # The LearningOnline Network with CAPA
    2: # Style Parser Module (new version)
    3: #
    4: # $Id: style.pm,v 1.17 2003/06/09 21:46:11 albertel Exp $
    5: #
    6: # Copyright Michigan State University Board of Trustees
    7: #
    8: # This file is part of the LearningOnline Network with CAPA (LON-CAPA).
    9: #
   10: # LON-CAPA is free software; you can redistribute it and/or modify
   11: # it under the terms of the GNU General Public License as published by
   12: # the Free Software Foundation; either version 2 of the License, or
   13: # (at your option) any later version.
   14: #
   15: # LON-CAPA is distributed in the hope that it will be useful,
   16: # but WITHOUT ANY WARRANTY; without even the implied warranty of
   17: # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   18: # GNU General Public License for more details.
   19: #
   20: # You should have received a copy of the GNU General Public License
   21: # along with LON-CAPA; if not, write to the Free Software
   22: # Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
   23: #
   24: # /home/httpd/html/adm/gpl.txt
   25: #
   26: # http://www.lon-capa.org/
   27: #
   28: # Copyright for TtHfunc and TtMfunc by Ian Hutchinson. 
   29: # TtHfunc and TtMfunc (the "Code") may be compiled and linked into 
   30: # binary executable programs or libraries distributed by the 
   31: # Michigan State University (the "Licensee"), but any binaries so 
   32: # distributed are hereby licensed only for use in the context
   33: # of a program or computational system for which the Licensee is the 
   34: # primary author or distributor, and which performs substantial 
   35: # additional tasks beyond the translation of (La)TeX into HTML.
   36: # The C source of the Code may not be distributed by the Licensee
   37: # to any other parties under any circumstances.
   38: #
   39: # written 01/08/01 by Alexander Sakharuk
   40: #
   41: 
   42: package Apache::style;
   43: 
   44: use strict;
   45: use HTML::TokeParser;
   46: 
   47: sub styleparser {
   48: 
   49:     my ($target,$content_style_string) = @_;
   50:     my $current_key = '';
   51:     my $current_value = '';
   52:     my @keys = ();
   53:     my @values = ();
   54:     my @style_array = ();
   55:     my $stoken;
   56: 
   57:     my $b_pos;
   58:     my $e_pos;
   59:     my $entry;
   60: 
   61:     $b_pos = index($content_style_string,'<definetag',0);
   62:     while ($b_pos != -1) {
   63: 	$e_pos = index($content_style_string,'</definetag',$b_pos);
   64: 	$entry = substr($content_style_string,$b_pos,$e_pos-$b_pos+12);       
   65: 	$_ = $entry;
   66: 	m/<definetag\s+name\s*=\s*\"([^\"]*)\"/;
   67: 	$current_key = $1;
   68: 	push @keys,$current_key;
   69: #	&Apache::lonxml::debug("$current_key\n");
   70: 	my $b_position =  index($entry,'<'.$target.'>',0);
   71: 	my $e_position =  index($entry,'</'.$target.'>',$b_position);
   72: 	my $target_length = length($target) + 2;
   73: 	if ($b_position > -1) {
   74: 	    my $entry_target = substr($entry,$b_position+$target_length,$e_position-$b_position-$target_length);
   75: 	    my $pstyle = HTML::TokeParser->new(\$entry_target);
   76: 	    while ($stoken = $pstyle->get_token) {
   77: 		if ($stoken->[0] eq 'T') {
   78: 		    $current_value .= $stoken->[1];
   79: 		} elsif ($stoken->[0] eq 'S') {
   80: 		    my $number=-1;
   81: 		    if ($stoken->[1] ne "$current_key") {
   82: 			$number = &testkey($stoken->[0],$stoken->[1],@keys);
   83: 		    }
   84: 		    if ($number != -1) {
   85: 			$current_value .= &testvalue($number,$stoken->[0],$stoken->[2],@values);
   86: 		    } else {
   87: 			$current_value .= $stoken->[4];
   88: 		    }
   89: 	        } else {
   90: 		    my $number=-1;
   91: 		    if (('/'.$stoken->[1]) ne "$current_key") {
   92: 			$number = &testkey($stoken->[0],$stoken->[1],@keys);
   93: 		    }
   94: 		    if ($number != -1) {
   95: 			$current_value .= &testvalue($number,$stoken->[0],$stoken->[2],@values);
   96: 		    } else {
   97: 			$current_value .= $stoken->[2];
   98: 		    }
   99: 	        }
  100: 	    }
  101: 	}
  102:         $current_value =~ s/\n//g;
  103: ###########
  104: #	$current_value =~ s/^\s*//g;
  105: #	$current_value =~ s/\s*$//g;
  106: #	$current_value =~ s/\( (\w)/($1/g;
  107: ###########
  108: 	if ($current_value) {
  109: 	    push(@values,$current_value);
  110: 	    #&Apache::lonxml::debug("a:$current_value: $#values \n");
  111: 	} else {
  112: 	    pop(@keys);
  113: 	}
  114: 	$current_key = '';
  115: 	$current_value ='';
  116: 	$b_pos = index($content_style_string,'<definetag',$b_pos+1);
  117:     }
  118: 
  119:     for (my $i=0; $i<=$#keys; $i++) {
  120: 	push @style_array,$keys[$i],$values[$i]; 
  121:     }
  122:     my %style_for_target =  @style_array;
  123: # check printing
  124: #    foreach $current_key (sort keys %style_for_target) {
  125: #	&Apache::lonxml::debug("$current_key => $style_for_target{$current_key}\n");
  126: #    }
  127: # return result
  128:   return %style_for_target; 
  129: 
  130: }
  131: 
  132: sub testkey {
  133: 
  134:     my ($zeroth,$first,@keys) = @_; 
  135:     my $number = -1;
  136:     if ($zeroth eq 'S') {
  137: 	for (my $i=$#keys; $i>=0; $i=$i-1) {
  138: 	    if ($first eq lc($keys[$i]))  { 
  139: 		$number = $i;
  140: 		last;
  141: 	    }
  142: 	}
  143:     } elsif ($zeroth eq 'E') {
  144: 	for (my $i=$#keys; $i>=0; $i=$i-1) {
  145: 	    if ('/'.$first eq lc($keys[$i]))  { 
  146: 		$number = $i;
  147: 	 	last;
  148: 	    }
  149: 	}
  150:     }
  151: 	return $number;
  152: }
  153: 
  154: sub testvalue {
  155: 
  156:     my ($number,$zeroth,$second,@values) = @_;   
  157:     my $current_content = $values[$number];
  158:     if ($zeroth eq 'S') {
  159: 	my %tempo_hash = %$second;
  160: 	while ((my $current_k,my $current_v) = each %tempo_hash) {
  161: 	    $current_content =~ s/\$$current_k/$current_v/g;
  162: 	}
  163:     } elsif ($zeroth eq 'E') {
  164: 	$current_content = $values[$number];
  165:     }
  166:     return $current_content;
  167: }
  168: 
  169: 1;
  170: 
  171: __END__