Annotation of loncom/interface/lonhelp.pm, revision 1.1
1.1 ! bowersj2 1: # The LearningOnline Network with CAPA
! 2: # .tex help system web server handler
! 3: #
! 4: # Copyright Michigan State University Board of Trustees
! 5: #
! 6: # This file is part of the LearningOnline Network with CAPA (LON-CAPA).
! 7: #
! 8: # LON-CAPA is free software; you can redistribute it and/or modify
! 9: # it under the terms of the GNU General Public License as published by
! 10: # the Free Software Foundation; either version 2 of the License, or
! 11: # (at your option) any later version.
! 12: #
! 13: # LON-CAPA is distributed in the hope that it will be useful,
! 14: # but WITHOUT ANY WARRANTY; without even the implied warranty of
! 15: # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
! 16: # GNU General Public License for more details.
! 17: #
! 18: # You should have received a copy of the GNU General Public License
! 19: # along with LON-CAPA; if not, write to the Free Software
! 20: # Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
! 21: #
! 22: # /home/httpd/html/adm/gpl.txt
! 23: #
! 24: # http://www.lon-capa.org/
! 25: #
! 26: # .tex file help handler
! 27: # YEAR=2002
! 28: # 7/4 Jeremy Bowers
! 29:
! 30: package Apache::lonhelp;
! 31:
! 32: use strict;
! 33: use Apache::Constants qw(:common :http);
! 34: use Apache::File;
! 35: use Apache::loncommon;
! 36: use tth;
! 37: use GDBM_File;
! 38:
! 39: # This sub takes the name of a label in, and converts it to something
! 40: # that is a valid anchor name.
! 41: sub processLabelName
! 42: {
! 43: my ($name) = @_;
! 44: $name =~ tr/a-zA-Z0-9/_/cs;
! 45: return $name;
! 46: }
! 47:
! 48: # Serve out the Tex
! 49: sub serveTex
! 50: {
! 51: my ($tex, $r) = @_;
! 52:
! 53: $r->print(<<HEADER);
! 54: <html>
! 55: <head>
! 56: <title>LON-CAPA Help</title>
! 57: </head>
! 58: <body bgcolor="#FFFFFF">
! 59: HEADER
! 60:
! 61: $r->print($tex);
! 62:
! 63: $r->print(<<FOOTER);
! 64: </body>
! 65: </html>
! 66: FOOTER
! 67: }
! 68:
! 69: # Render takes a tex fragment, transforms it for TtH, and returns the
! 70: # HTML equivalent
! 71: sub render
! 72: {
! 73: my ($tex) = @_;
! 74: tie (my %fragmentLabels, 'GDBM_File', '/home/httpd/html/adm/help/fragmentLabels.gdbm', 0, 0);
! 75:
! 76: # This tells TtH what to do with captions, labels, and other
! 77: # things
! 78: $tex = "\\documentclass{article}\n" . $tex;
! 79:
! 80: # We process these ourselves because TtH can't handle then without
! 81: # LaTeX .aux files
! 82: $tex =~ s| \\ref\{([^}]*)\}
! 83: |'\\href{' .
! 84: substr($fragmentLabels{$1}, 0, -4) .
! 85: '#' . processLabelName($1) .
! 86: '}{graphic}'
! 87: |gxe;
! 88:
! 89: # Figures leftover without captions
! 90: $tex =~ s| \\includegraphics(\[[^]]*\])*\{([^}]*)\}
! 91: | '\\begin{html}<img src="gif/' . $2 . '.gif" border="2"'.
! 92: ' bordercolor="#000000"/>\\end{html}'
! 93: |gxe;
! 94:
! 95: $tex = tth::tth($tex);
! 96:
! 97: # For some reason all captions come out as "Figure 0:", so
! 98: # just duck the issue...
! 99:
! 100: $tex =~ s/Figure 0://g;
! 101:
! 102: untie %fragmentLabels;
! 103:
! 104: return $tex;
! 105: }
! 106:
! 107: # UNCOMMENT FOR HANDLER ONLY
! 108: sub handler
! 109: {
! 110: my $r = shift;
! 111:
! 112: my $filename = substr ($ENV{'REQUEST_URI'} ,
! 113: rindex($ENV{'REQUEST_URI'}, '/') + 1, -4);
! 114:
! 115: # Security check on the file; the whole filename must consist
! 116: # of nothing but alphanums, ' ,, or ., or the file
! 117: # will be "not found", no matter what.
! 118:
! 119: return 404 if ($filename !~ /\A[-0-9a-zA-z_'',.]+\Z/);
! 120:
! 121: (my $file = Apache::File->new("/home/httpd/html/adm/help/tex/".$filename.'.tex'))
! 122: or return 404;
! 123: my $tex = join('', <$file>);
! 124: $tex = render($tex);
! 125: $r->content_type("text/html");
! 126: serveTex($tex, $r);
! 127:
! 128: return OK;
! 129: }
! 130:
! 131: 1;
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