1: # The LearningOnline Network
2: # convert_file takes a well-formed XML file content and converts it to LON-CAPA syntax.
3: #
4: # $Id: xml_to_loncapa.pm,v 1.5 2016/01/06 16:44:32 damieng 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: ###
29:
30: #!/usr/bin/perl
31:
32: package Apache::xml_to_loncapa;
33:
34: use strict;
35: use utf8;
36: use warnings;
37:
38: use XML::LibXML;
39:
40:
41: my @loncapa_block = ('parameter','location','answer','foil','image','polygon','rectangle','text','conceptgroup','itemgroup','item','label','data','function','array','unit','answergroup','functionplotresponse','functionplotruleset','functionplotelements','functionplotcustomrule','essayresponse','hintpart','formulahint','numericalhint','reactionhint','organichint','optionhint','radiobuttonhint','stringhint','customhint','mathhint','formulahintcondition','numericalhintcondition','reactionhintcondition','organichintcondition','optionhintcondition','radiobuttonhintcondition','stringhintcondition','customhintcondition','mathhintcondition','imageresponse','foilgroup','datasubmission','textfield','hiddensubmission','radiobuttonresponse','rankresponse','matchresponse','import','style','script','window','block','library','notsolved','part','postanswerdate','preduedate','problem','problemtype','randomlabel','bgimg','labelgroup','randomlist','solved','while','tex','print','web','gnuplot','curve','Task','IntroParagraph','ClosingParagraph','Question','QuestionText','Setup','Instance','InstanceText','Criteria','CriteriaText','GraderNote','languageblock','translated','lang','instructorcomment','dataresponse','togglebox','standalone','comment','drawimage','allow','displayduedate','displaytitle','responseparam','organicstructure','scriptlib','parserlib','drawoptionlist','spline','backgroundplot','plotobject','plotvector','drawvectorsum','functionplotrule','functionplotvectorrule','functionplotvectorsumrule','axis','key','xtics','ytics','title','xlabel','ylabel','hiddenline','dtm','stringresponse','optionresponse','numericalresponse','formularesponse','mathresponse','organicresponse','reactionresponse','customresponse','externalresponse', 'hint', 'hintgroup');
42:
43: my @loncapa_inline = ('display','m','lm','chem','num','parse','algebra','displayweight','displaystudentphoto'); # not textline
44:
45: # HTML elements that trigger the addition of startouttext/endouttext
46: my @html_trigger = ('header','footer','aside','h1','h2','h3','h4','h5','h6','li','dd','dt','tbody','tr','caption','thead','tfoot','td','th','span','a','em','strong','b','i','sup','sub','pre','code','kbd','samp','cite','q','tt','ins','del','var','small','big','br','hr','address','blockquote','img','figure','figcaption','object','param','embed','applet','video','source','audio','map','area','canvas','form','input','select','optgroup','option','textarea','fieldset','legend','button','iframe','section','div','p','ul','ol','dl','table');
47:
48: my @simple_data = ('polygon', 'rectangle', 'vector', 'value', 'answer', 'title', 'data', 'function', 'xlabel', 'ylabel', 'tic', 'parserlib', 'scriptlib', 'import', 'tex', 'text', 'image', 'display', 'm', 'lm', 'num', 'algebra', 'chem', 'parse', 'title', 'style', 'script', 'ins', 'del', 'label', 'option', 'textarea', 'legend' );
49:
50: my @inline_responses = ('stringresponse','optionresponse','numericalresponse','formularesponse','mathresponse','organicresponse','reactionresponse','customresponse','externalresponse');
51:
52: # see http://www.w3.org/TR/html-polyglot/#empty-elements
53: # and http://tiffanybbrown.com/2011/03/23/html5-does-not-allow-self-closing-tags/
54: # HTML elements that do not have an empty content, and must never use a self-closing tag:
55: my @non_empty_html = ('title','style','script','noscript','body','section','header','footer','article','aside','nav','h1','h2','h3','h4','h5','h6','div','p','li','dt','dd','caption','td','th','span','a','em','strong','b','i','sup','sub','pre','code','kbd','samp','cite','q','tt','ins','del','var','small','big','address','blockquote','bdo','ruby','rb','rp','rt','rtc','figure','figcaption','object','applet','video','audio','canvas','label','option','textarea','fieldset','legend','button','iframe');
56:
57:
58: # Converts a file and return the modified contents
59: sub convert_file {
60: my ($contents) = @_;
61:
62: my $dom_doc = XML::LibXML->load_xml(string => $contents);
63: my $root = $dom_doc->documentElement();
64: if (defined $root && $root->nodeName ne 'html') {
65: add_outtext($dom_doc);
66: }
67: return node_to_string($dom_doc);
68: }
69:
70:
71: sub node_to_string {
72: my ($node) = @_;
73:
74: if ($node->nodeType == XML_DOCUMENT_NODE) {
75: my $root = $node->documentElement();
76: return node_to_string($root);
77: } elsif ($node->nodeType == XML_TEXT_NODE || $node->nodeType == XML_CDATA_SECTION_NODE) {
78: my $parent = $node->parentNode;
79: my $parent_name = $parent->nodeName;
80: my $grandparent_name;
81: if (defined $parent->parentNode) {
82: $grandparent_name = $parent->parentNode->nodeName;
83: }
84: my @no_escape = ('m', 'script', 'display', 'parse', 'answer');
85: if (string_in_array(\@no_escape, $parent_name) &&
86: ($parent_name ne 'answer' ||
87: (defined $grandparent_name &&
88: $grandparent_name ne 'numericalresponse' &&
89: $grandparent_name ne 'formularesponse'))) {
90: return $node->nodeValue;
91: } else {
92: return $node->toString();
93: }
94: } elsif ($node->nodeType == XML_ELEMENT_NODE) {
95: my $s = '';
96: my $tag = $node->nodeName;
97: $s .= "<$tag";
98: my @attributes = $node->attributes();
99: foreach my $attribute (@attributes) {
100: $s .= ' ';
101: $s .= $attribute->nodeName;
102: $s .= '="';
103: $s .= escape_attribute($attribute->nodeValue);
104: $s .= '"';
105: }
106: if ($node->hasChildNodes() || string_in_array(\@non_empty_html, $tag)) {
107: $s .= '>';
108: foreach my $child ($node->childNodes) {
109: $s .= node_to_string($child);
110: }
111: $s .= "</$tag>";
112: } else {
113: $s .= '/>';
114: }
115: return $s;
116: } else {
117: return $node->toString();
118: }
119: }
120:
121: # Escapes an attribute value
122: sub escape_attribute {
123: my ($s) = @_;
124: # normal XML escapes do not work with LON-CAPA, for instance with reactionresponse
125: #$s =~ s/&/&/sg;
126: #$s =~ s/</</sg;
127: #$s =~ s/>/>/sg;
128: $s =~ s/"/"/sg;
129: return $s;
130: }
131:
132: # Adds startouttext and endouttext where useful for the colorful editor
133: sub add_outtext {
134: my ($node) = @_;
135:
136: if ($node->nodeType == XML_DOCUMENT_NODE) {
137: my $root = $node->documentElement();
138: add_outtext($root);
139: return;
140: }
141: if ($node->nodeType != XML_ELEMENT_NODE) {
142: return;
143: }
144: if (string_in_array(\@simple_data, $node->nodeName)) {
145: return;
146: }
147: convert_paragraphs($node);
148: my $next;
149: my $in_outtext = 0;
150: for (my $child=$node->firstChild; defined $child; $child=$next) {
151: $next = $child->nextSibling;
152: if (!$in_outtext && inside_outtext($child)) {
153: add_startouttext($node, $child);
154: $in_outtext = 1;
155: } elsif ($in_outtext && !continue_outtext($child)) {
156: add_endouttext($node, $child);
157: $in_outtext = 0;
158: }
159: if (!$in_outtext) {
160: add_outtext($child);
161: }
162: }
163: if ($in_outtext) {
164: add_endouttext($node);
165: }
166: }
167:
168: # Returns 1 if this node should trigger the addition of startouttext before it
169: sub inside_outtext {
170: my ($node) = @_;
171: if ($node->nodeType == XML_TEXT_NODE && $node->nodeValue !~ /^\s*$/) {
172: return 1;
173: }
174: if ($node->nodeType == XML_ELEMENT_NODE && string_in_array(\@html_trigger, $node->nodeName)) {
175: if (contains_loncapa_block($node)) {
176: return 0;
177: } else {
178: return 1;
179: }
180: }
181: if ($node->nodeType == XML_ELEMENT_NODE && string_in_array(\@loncapa_inline, $node->nodeName)) {
182: return 1;
183: }
184: return 0;
185: }
186:
187: # Returns 1 if the outtext environment can continue with this node
188: sub continue_outtext {
189: my ($node) = @_;
190: if (inside_outtext($node)) {
191: return 1;
192: }
193: if ($node->nodeType == XML_TEXT_NODE) {
194: return 1; # continue even if this is just spaces
195: }
196: return 0;
197: }
198:
199: # Returns 1 if the node contains a LON-CAPA block in a descendant.
200: sub contains_loncapa_block {
201: my ($node) = @_;
202: foreach my $child ($node->childNodes) {
203: if ($child->nodeType == XML_ELEMENT_NODE) {
204: if (string_in_array(\@loncapa_block, $child->nodeName)) {
205: return 1;
206: }
207: if (contains_loncapa_block($child)) {
208: return 1;
209: }
210: }
211: }
212: return 0;
213: }
214:
215: sub add_startouttext {
216: my ($parent, $before_node) = @_;
217: my $doc = $parent->ownerDocument;
218: if ($before_node->nodeType == XML_TEXT_NODE) {
219: # split space at the beginning of the node
220: if ($before_node->nodeValue =~ /^(\s+)(.*?)$/s) {
221: my $space_node = $doc->createTextNode($1);
222: $before_node->setData($2);
223: $parent->insertBefore($space_node, $before_node);
224: }
225: }
226: my $startouttext = $doc->createElement('startouttext');
227: $parent->insertBefore($startouttext, $before_node);
228: }
229:
230: sub add_endouttext {
231: my ($parent, $before_node) = @_;
232: my $doc = $parent->ownerDocument;
233: my $endouttext = $doc->createElement('endouttext');
234: my $before_before;
235: if (defined $before_node) {
236: $before_before = $before_node->previousSibling;
237: } else {
238: $before_before = $parent->lastChild;
239: }
240: if (defined $before_before && $before_before->nodeType == XML_TEXT_NODE) {
241: # split space at the end of the node
242: if ($before_before->nodeValue =~ /^(.*?)(\s+)$/s) {
243: $before_before->setData($1);
244: my $space_node = $doc->createTextNode($2);
245: if (defined $before_node) {
246: $parent->insertBefore($space_node, $before_node);
247: } else {
248: $parent->appendChild($space_node);
249: }
250: $before_node = $space_node;
251: }
252: }
253: if (defined $before_node) {
254: $parent->insertBefore($endouttext, $before_node);
255: } else {
256: $parent->appendChild($endouttext);
257: }
258: }
259:
260: # Convert paragraph children when one contains an inline response into content + <br>
261: # (the colorful editor does not support paragraphs containing inline responses)
262: sub convert_paragraphs {
263: my ($parent) = @_;
264: my $p_child_with_inline_response = 0;
265: foreach my $child ($parent->childNodes) {
266: if ($child->nodeType == XML_ELEMENT_NODE && $child->nodeName eq 'p') {
267: foreach my $child2 ($child->childNodes) {
268: if ($child2->nodeType == XML_ELEMENT_NODE) {
269: if (string_in_array(\@inline_responses, $child2->nodeName)) {
270: $p_child_with_inline_response = 1;
271: last;
272: }
273: }
274: }
275: }
276: if ($p_child_with_inline_response) {
277: last;
278: }
279: }
280: if ($p_child_with_inline_response) {
281: my $doc = $parent->ownerDocument;
282: my $next;
283: for (my $child=$parent->firstChild; defined $child; $child=$next) {
284: $next = $child->nextSibling;
285: if ($child->nodeType == XML_ELEMENT_NODE && $child->nodeName eq 'p') {
286: replace_by_children($child);
287: if (defined $next && (defined $next->nextSibling || $next->nodeType != XML_TEXT_NODE ||
288: $next->nodeValue !~ /^\s*$/)) {
289: # we only add a br if there is something after
290: my $br = $doc->createElement('br');
291: $parent->insertBefore($br, $next);
292: }
293: }
294: }
295: }
296: }
297:
298: ##
299: # Tests if a string is in an array (using eq) (to avoid Smartmatch warnings with $value ~~ @array)
300: # @param {Array<string>} array - reference to the array of strings
301: # @param {string} value - the string to look for
302: # @returns 1 if found, 0 otherwise
303: ##
304: sub string_in_array {
305: my ($array, $value) = @_;
306: foreach my $v (@{$array}) {
307: if ($v eq $value) {
308: return 1;
309: }
310: }
311: return 0;
312: }
313:
314: ##
315: # replaces a node by its children
316: # @param {Node} node - the DOM node
317: ##
318: sub replace_by_children {
319: my ($node) = @_;
320: my $parent = $node->parentNode;
321: my $next;
322: my $previous;
323: for (my $child=$node->firstChild; defined $child; $child=$next) {
324: $next = $child->nextSibling;
325: if ((!defined $previous || !defined $next) &&
326: $child->nodeType == XML_TEXT_NODE && $child->nodeValue =~ /^\s*$/) {
327: next; # do not keep first and last whitespace nodes
328: } else {
329: if (!defined $previous && $child->nodeType == XML_TEXT_NODE) {
330: # remove whitespace at the beginning
331: my $value = $child->nodeValue;
332: $value =~ s/^\s+//;
333: $child->setData($value);
334: }
335: if (!defined $next && $child->nodeType == XML_TEXT_NODE) {
336: # and at the end
337: my $value = $child->nodeValue;
338: $value =~ s/\s+$//;
339: $child->setData($value);
340: }
341: }
342: $node->removeChild($child);
343: $parent->insertBefore($child, $node);
344: $previous = $child;
345: }
346: $parent->removeChild($node);
347: }
348:
349: 1;
350: __END__
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