Annotation of loncom/xml/lonlatextable.pm, revision 1.2
1.1 foxr 1: # Generating TeX tables.
2: #
1.2 ! foxr 3: # $Id: lonlatextable.pm,v 1.1 2010/08/18 12:04:31 foxr Exp $
1.1 foxr 4: #
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: ## Copyright for TtHfunc and TtMfunc by Ian Hutchinson.
28: # TtHfunc and TtMfunc (the "Code") may be compiled and linked into
29: # binary executable programs or libraries distributed by the
30: # Michigan State University (the "Licensee"), but any binaries so
31: # distributed are hereby licensed only for use in the context
32: # of a program or computational system for which the Licensee is the
33: # primary author or distributor, and which performs substantial
34: # additional tasks beyond the translation of (La)TeX into HTML.
35: # The C source of the Code may not be distributed by the Licensee
36: # to any other parties under any circumstances.
37: #
38:
39: # This module is a support packkage that helps londefdef generate
40: # LaTeX tables using the LaTeX::Table package. A prerequisite is that
41: # the print generator must have added the following to the LaTeX
42: #
43: # \usepackage{xtab}
44: # \usepackage{booktabs}
45: # \usepackage{array}
46: # \usepackage{colortbl}
47: # \usepackage{xcolor}
48: #
49: # These packages are installed in the packaged LaTeX distributions we know of as of
50: # 11/24/2008
51: #
52:
53:
54: #
55: # This module provides a sub-set substitute for LaTeX::table
56: # which is a great module but unfortunately not usable in safe space
57: #
58:
59:
60: =pod
61:
62: =head1 NAME
63:
64: Apache:lonltextable
65:
66: =head1 SYNOPSIS
67:
68: use Apache::lonlatextable;
69:
70: $table = Apache::lonlatextable->new();
71: $table->set_caption("some text");
72: $table->set_data(cell_descriptions);
73: $table->{'coldef'} = column_definitions;
74: $table->generate_string();
75:
76: =head1 DETAILS
77:
78: =cut
79:
80: package Apache::lonlatextable;
81: use strict;
82:
83: =pod
84:
85: =head2 new
86:
87: Creates a new instance of a lonlatextable. The returned value should be used on the left side of the
88: -> for further calls to object methods
89:
90: =head3 Example:
91:
92: my $latexTable = &Apache::lonlatextable->new();
93:
94: =cut
95:
96:
97: sub new {
98: my ($class) = @_;
99:
100: my $self = {
101: caption => '',
102: data => [],
103: coldef => '',
104:
105: };
106: bless($self, $class);
107: return $self;
108: }
109:
110: =pod
111:
112: =head2 set_caption(some_text)
113:
114: Set the table caption value. If this string is empty, the table will be generated without a caption.
115: some_text will be the new table caption value.
116:
117: =head3 Example:
118:
119: $table = Apache::lonlatextable->new();
120: $table->set_caption("Some very interesting table");
121:
122: =cut
123:
124: sub set_caption {
125: my ($self, $caption) = @_;
126: $self->{'caption'} = $caption;
127: }
128:
129: =pod
130:
131: =head2 set_data(cell_descriptions)
132:
133: Sets the table cell data. Table data in its simplest is an aray of arrays. Each outer
134: array element is a table row. However:
135:
136: =over 3
137:
138: =item Single column rows sarting with \
139:
140: These are treated as LaTeX/TeX commands and, when the table is generated,
141: passed without interpretation.
142:
1.2 ! foxr 143: =item Lines with one cell that is empty.
1.1 foxr 144:
145: These produce a horizontal rule that spans the width of the table.
146:
147: =back
148:
149: =head3 Example
150:
151: $table->set_data([ ['Gnu', '92.52'], [], ['Emu', '33.33'] ]);
152:
153: Produces
154: +--------------+--------------+
155: | Gnu | 92.52 |
156: +--------------+--------------+ (due to the empty row).
157: | Emu | 33.33 |
158: +--------------+--------------+
159:
160: =cut
161:
162: sub set_data {
163: my ($self, $data) = @_;
164: $self->{'data'} = $data;
165:
166: }
167:
168: =pod
169:
170: =head2 Column definitions.
171:
172: The hash value 'coldef' can overide the column definitions computed by default for the table.
173:
174: =head3 Example
175:
176: $table->{'coldef'} = 'lrcr';
177:
178: Produces table header output of:
179:
180: \begin{tabular}{lrcr}
181:
182: The default is to produce a set of left aligned columns. The number of columns produced
183: will be determined by the size of the longest row.
184:
185: =cut
186:
187: =pod
188:
189: =head2 $table->generate_string()
190:
191: Generates the LaTeX for the table as a string that is returned to the caller.
192:
193: =head3 Example
194:
195: $latex = $table->generate_string();
196:
197: =cut
198:
199: sub generate_string {
200:
201: my ($self) = @_;
202: my $result;
203:
204: $result = $self->table_header();
205: $result .= $self->table_body();
206: $result .= $self->table_trailer();
207:
208:
209:
210: return $result;
211: }
212:
213:
214: ###################################################################################
215: #
216: # Private methods:
217: #
218:
219: # generate the table header.
220: # If coldef is an empty string, the default column definition is computed instead.
221: #
222: sub table_header()
223: {
224: my ($self) = @_;
1.2 ! foxr 225: my $result = '\begin{tabular}{';
1.1 foxr 226: my $coldef = $self->{'coldef'};
227:
228: if ($coldef eq '') {
229: my @rows = @$self->{'data'};
230: my $longest = 0;
231: foreach my $row (@rows) {
232: my $length = scalar @{$row};
233: if ($length > $longest) {
234: $longest = $length;
235: }
236: }
237: # $longest cells all left aligned.
238: # There's got to be a better way than this in perl?
239:
240: for (my $i =0; $i < $longest; $i++) {
241: $coldef .= 'l';
242: }
243: }
244:
245: $result .= $coldef . '}';
246: $result .= "\n";
247:
248: return $result;
249: }
250: #
251: # Generate the table body
252: #
253: sub table_body()
254: {
1.2 ! foxr 255: my ($self) = @_;
! 256: my $result = '';
! 257: foreach my $row (@{$self->{'data'}}) {
! 258: #
! 259: # If a row has only a single cell we need to deal with the two special cases
! 260: # Pass LaTeX uninterpreted or \hline.
! 261: #
! 262: if ((scalar @{$row}) == 1) {
! 263: my $cell = $row->[0];
! 264: if ($cell eq '') {
! 265: $result .= '\hline' . "\n";
! 266: } elsif (substr($cell, 0, 1) eq "\\") {
! 267: $result .= $cell . "\n";
! 268: } else {
! 269: # could just be a table with one col...
! 270:
! 271: $result .= $cell . ' \\\\ ' ."\n";
! 272: }
! 273: } else {
! 274: my $line = '';
! 275: foreach my $cell (@{$row}) {
! 276: $line .= $cell . ' & ';
! 277: }
! 278: # Replace the last ' & ' with \\ and a line terminator..
! 279: # and append the line to the result.
! 280:
! 281: $line =~ s/ & $/ \\\\\n/;
! 282: $result .= $line;
! 283: }
! 284: }
! 285: return $result;
1.1 foxr 286: }
287:
288: #
289: # Generate the table trailer
290: #
291: sub table_trailer {
292: my ($self) = @_;
293:
294: my $result = '\end{tabular}' . "\n";
295: if ($self->{'caption'} ne '') {
296: $result .= '\caption{' . $self->{'caption'} . '}' . "\n";
297: }
298: return $result;
299: }
300:
301:
302:
303: 1;
304: __END__
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