1: # The LearningOnline Network with CAPA
2: # Style Parser Module (new version)
3: #
4: # $Id: style.pm,v 1.20 2003/11/09 01:14:30 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 @keys = ();
51: my @values = ();
52: my $current_value;
53: my $allow=0;
54: my $pstyle = HTML::TokeParser->new(\$content_style_string);
55: while (my $stoken = $pstyle->get_token) {
56: if (($stoken->[0] eq 'S') && ($stoken->[1] eq 'definetag')) {
57: push @keys,$stoken->[2]->{'name'};
58: $current_value='';
59: $allow=0;
60: } elsif (($stoken->[0] eq 'E') && ($stoken->[1] eq 'definetag')) {
61: $current_value =~ s/(\s)+/$1/g;
62: $current_value =~ s/\n//g;
63: push(@values,$current_value);
64: } elsif (($target eq 'meta') && ($stoken->[0] eq 'S') && ($stoken->[1] eq 'meta')) {
65: $allow=1;
66: } elsif (($target eq 'meta') && ($stoken->[0] eq 'E') && ($stoken->[1] eq 'meta')) {
67: $allow=0;
68: } elsif (($target ne 'meta') && ($stoken->[0] eq 'S') && ($stoken->[1] eq 'render')) {
69: $allow=1;
70: } elsif (($target ne 'meta') && ($stoken->[0] eq 'E') && ($stoken->[1] eq 'render')) {
71: $allow=0;
72: } elsif (($target ne 'meta') && ($target ne 'web') && ($stoken->[0] eq 'S') && ($stoken->[1] eq 'web')) {
73: $allow=0;
74: } elsif (($target ne 'meta') && ($target ne 'web') && ($stoken->[0] eq 'E') && ($stoken->[1] eq 'web')) {
75: $allow=1;
76: } elsif (($target ne 'meta') && ($target ne 'tex') && ($stoken->[0] eq 'S') && ($stoken->[1] eq 'tex')) {
77: $allow=0;
78: } elsif (($target ne 'meta') && ($target ne 'tex') && ($stoken->[0] eq 'E') && ($stoken->[1] eq 'tex')) {
79: $allow=1;
80: } elsif (($stoken->[0] eq 'S') && ($stoken->[1] eq 'target') && (not $stoken->[2]->{'name'}=~/(^\s*$target\s*,|,\s*$target\s*,|,\s*$target\s*$|^\s*$target\s*$)/)) {
81: $allow=0;
82: } elsif (($stoken->[0] eq 'E') && ($stoken->[1] eq 'target')) {
83: $allow=1;
84: } elsif (($target ne 'meta') && ($stoken->[0] eq 'S') && ($stoken->[1] eq $target)) {
85: $allow=1;
86: } elsif (($target ne 'meta') && ($stoken->[0] eq 'E') && ($stoken->[1] eq $target)) {
87: } elsif (($stoken->[0] eq 'S') && ($stoken->[1] eq 'target') && ($stoken->[2]->{'name'}=~/(^\s*$target\s*,|,\s*$target\s*,|,\s*$target\s*$|^\s*$target\s*$)/)) {
88: $allow=1;
89: } elsif ($allow) {
90: if ($stoken->[0] eq 'T') {
91: $current_value .= $stoken->[1];
92: } elsif ($stoken->[0] eq 'S') {
93: my $number=-1;
94: if ($stoken->[1] ne $keys[-1]) {
95: $number = &testkey($stoken->[0],$stoken->[1],@keys);
96: }
97: if ($number != -1) {
98: $current_value .= &testvalue($number,$stoken->[0],$stoken->[2],@values);
99: } else {
100: $current_value .= $stoken->[4];
101: }
102: } elsif ($stoken->[0] eq 'E') {
103: my $number=-1;
104: if (('/'.$stoken->[1]) ne $keys[-1]) {
105: $number = &testkey($stoken->[0],$stoken->[1],@keys);
106: }
107: if ($number != -1) {
108: $current_value .= &testvalue($number,$stoken->[0],$stoken->[2],@values);
109: } else {
110: $current_value .= $stoken->[2];
111: }
112: }
113: }
114: }
115: my %style_for_target;
116: for (my $i=0; $i<=$#keys; $i++) {
117: if ($values[$i] !~ /^\s*$/) {
118: $style_for_target{$keys[$i]}=$values[$i];
119: }
120: }
121: return %style_for_target;
122: }
123:
124:
125: sub testkey {
126:
127: my ($zeroth,$first,@keys) = @_;
128: my $number = -1;
129: if ($zeroth eq 'S') {
130: for (my $i=$#keys; $i>=0; $i=$i-1) {
131: if ($first eq lc($keys[$i])) {
132: $number = $i;
133: last;
134: }
135: }
136: } elsif ($zeroth eq 'E') {
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: }
144: return $number;
145: }
146:
147: sub testvalue {
148:
149: my ($number,$zeroth,$second,@values) = @_;
150: my $current_content = $values[$number];
151: if ($zeroth eq 'S') {
152: my %tempo_hash = %$second;
153: while ((my $current_k,my $current_v) = each %tempo_hash) {
154: $current_content =~ s/\$$current_k/$current_v/g;
155: }
156: } elsif ($zeroth eq 'E') {
157: $current_content = $values[$number];
158: }
159: return $current_content;
160: }
161:
162: 1;
163:
164: __END__
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