1: # The LearningOnline Network
2: # Third step to clean a file.
3: #
4: # $Id: post_xml.pm,v 1.7 2016/01/14 16:28:06 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::post_xml;
33:
34: use strict;
35: use utf8;
36: use warnings;
37:
38: use File::Basename;
39: use File::Temp qw/ tempfile /;
40: use Cwd 'abs_path';
41: use XML::LibXML;
42: use HTML::TokeParser; # used to parse sty files
43: use Tie::IxHash; # for ordered hashes
44: use tth;
45: use Apache::html_to_xml;
46:
47: no warnings 'recursion'; # yes, fix_paragraph is using heavy recursion, I know
48:
49: # these are constants
50: my @block_elements = ('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','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');
51: my @inline_like_block = ('stringresponse','optionresponse','numericalresponse','formularesponse','mathresponse','organicresponse','reactionresponse','customresponse','externalresponse', 'hint', 'hintgroup','translated','lang'); # inline elements treated like blocks for pretty print and some other things
52: my @responses = ('stringresponse','optionresponse','numericalresponse','formularesponse','mathresponse','organicresponse','reactionresponse','customresponse','externalresponse','essayresponse','radiobuttonresponse','matchresponse','rankresponse','imageresponse','functionplotresponse');
53: my @block_html = ('html','head','body','section','h1','h2','h3','h4','h5','h6','div','p','ul','ol','li','table','tbody','tr','td','th','dl','dt','dd','pre','noscript','hr','address','blockquote','object','applet','embed','map','form','fieldset','iframe','center','frameset');
54: my @no_newline_inside = ('import','parserlib','scriptlib','data','function','label','xlabel','ylabel','tic','text','rectangle','image','title','h1','h2','h3','h4','h5','h6','li','td','p');
55: my @preserve_elements = ('script','answer','pre','style');
56: my @accepting_style = ('section','h1','h2','h3','h4','h5','h6','div','p','li','td','th','dt','dd','pre','blockquote');
57: my @latex_math = ('\alpha', '\theta', '\omicron', '\tau', '\beta', '\vartheta', '\pi', '\upsilon', '\gamma', '\gamma', '\varpi', '\phi', '\delta', '\kappa', '\rho', '\varphi', '\epsilon', '\lambda', '\varrho', '\chi', '\varepsilon', '\mu', '\sigma', '\psi', '\zeta', '\nu', '\varsigma', '\omega', '\eta', '\xi',
58: '\Gamma', '\Lambda', '\Sigma', '\Psi', '\Delta', '\Xi', '\Upsilon', '\Omega', '\Theta', '\Pi', '\Phi',
59: '\pm', '\cap', '\diamond', '\oplus', '\mp', '\cup', '\bigtriangleup', '\ominus', '\times', '\uplus', '\bigtriangledown', '\otimes', '\div', '\sqcap', '\triangleleft', '\oslash', '\ast', '\sqcup', '\triangleright', '\odot', '\star', '\vee', '\lhd$', '\bigcirc', '\circ', '\wedge', '\rhd$', '\dagger', '\bullet', '\setminus', '\unlhd$', '\ddagger', '\cdot', '\wr', '\unrhd$', '\amalg', '+', '-',
60: '\leq', '\geq', '\equiv', '\models', '\prec', '\succ', '\sim', '\perp', '\preceq', '\succeq', '\simeq', '\mid', '\ll', '\gg', '\asymp', '\parallel', '\subset', '\supset', '\approx', '\bowtie', '\subseteq', '\supseteq', '\cong', '\Join$', '\sqsubset$', '\sqsupset$', '\neq', '\smile', '\sqsubseteq', '\sqsupseteq', '\doteq', '\frown', '\in', '\ni', '\propto', '\vdash', '\dashv',
61: '\colon', '\ldotp', '\cdotp',
62: '\leftarrow', '\longleftarrow', '\uparrow', '\Leftarrow', '\Longleftarrow', '\Uparrow', '\rightarrow', '\longrightarrow', '\downarrow', '\Rightarrow', '\Longrightarrow', '\Downarrow', '\leftrightarrow', '\longleftrightarrow', '\updownarrow', '\Leftrightarrow', '\Longleftrightarrow', '\Updownarrow', '\mapsto', '\longmapsto', '\nearrow', '\hookleftarrow', '\hookrightarrow', '\searrow', '\leftharpoonup', '\rightharpoonup', '\swarrow', '\leftharpoondown', '\rightharpoondown', '\nwarrow', '\rightleftharpoons', '\leadsto$',
63: '\ldots', '\cdots', '\vdots', '\ddots', '\aleph', '\prime', '\forall', '\infty', '\hbar', '\emptyset', '\exists', '\Box$', '\imath', '\nabla', '\neg', '\Diamond$', '\jmath', '\surd', '\flat', '\triangle', '\ell', '\top', '\natural', '\clubsuit', '\wp', '\bot', '\sharp', '\diamondsuit', '\Re', '\|', '\backslash', '\heartsuit', '\Im', '\angle', '\partial', '\spadesuit', '\mho$',
64: '\sum', '\bigcap', '\bigodot', '\prod', '\bigcup', '\bigotimes', '\coprod', '\bigsqcup', '\bigoplus', '\int', '\bigvee', '\biguplus', '\oint', '\bigwedge',
65: '\arccos', '\cos', '\csc', '\exp', '\ker', '\limsup', '\min', '\sinh', '\arcsin', '\cosh', '\deg', '\gcd', '\lg', '\ln', '\Pr', '\sup', '\arctan', '\cot', '\det', '\hom', '\lim', '\log', '\sec', '\tan', '\arg', '\coth', '\dim', '\inf', '\liminf', '\max', '\sin', '\tanh',
66: '\uparrow', '\Uparrow', '\downarrow', '\Downarrow', '\updownarrow', '\Updownarrow', '\lfloor', '\rfloor', '\lceil', '\rceil', '\langle', '\rangle', '\backslash',
67: '\rmoustache', '\lmoustache', '\rgroup', '\lgroup', '\arrowvert', '\Arrowvert', '\bracevert',
68: '\hat{', '\acute{', '\bar{', '\dot{', '\breve{', '\check{', '\grave{', '\vec{', '\ddot{', '\tilde{',
69: '\widetilde{', '\widehat{', '\overleftarrow{', '\overrightarrow{', '\overline{', '\underline{', '\overbrace{', '\underbrace{', '\sqrt{', '\sqrt[', '\frac{'
70: );
71: # list of elements that can contain style elements:
72: my @containing_styles = ('library','problem',@responses,'foil','item','text','hintgroup','hintpart','label','part','preduedate','postanswerdate','solved','notsolved','block','while','web','standalone','problemtype','languageblock','translated','lang','window','windowlink','togglebox','instructorcomment','body','section','div','p','li','dd','td','th','blockquote','object','applet','video','audio','canvas','fieldset','button',
73: 'span','strong','em','b','i','sup','sub','code','kbd','samp','tt','ins','del','var','small','big','u','font');
74: my @html_styles = ('span', 'strong', 'em' , 'b', 'i', 'sup', 'sub', 'tt', 'var', 'small', 'big', 'u');
75:
76: my $warnings; # 1 = print warnings
77:
78:
79: # Parses the XML document and fixes many things to turn it into a document matching the schema.
80: # @param {reference} textref - reference to the text of the document
81: # @param {string} file_path - path of the file being processed (we only extract the directory path from it)
82: # @param {string} res_dir - path of res directory parent (without the / at the end)
83: # @param {boolean} warn - 1 to print warnings, 0 otherwise
84: # @returns the text of the document as a byte string.
85: sub post_xml {
86: my ($textref, $file_path, $res_dir, $warn) = @_;
87: $warnings = $warn;
88:
89: my $dom_doc = XML::LibXML->load_xml(string => $textref);
90:
91: my $root = fix_structure($dom_doc);
92:
93: remove_elements($root, ['startouttext','startoutext','startottext','startouttex','startouttect','atartouttext','starouttext','starttextout','starttext','starttextarea','endouttext','endoutext','endoutttext','endouttxt','endouutext','ednouttext','endouttex','endoouttext','endouttest','endtextout','endtextarea','startpartmarker','endpartmarker','basefont','x-claris-tagview','x-claris-window','x-sas-window']);
94:
95: remove_empty_attributes($root);
96:
97: fix_attribute_case($root);
98:
99: replace_m($root);
100:
101: my @all_block = (@block_elements, @block_html);
102: add_sty_blocks($file_path, $res_dir, $root, \@all_block); # must come before the subs using @all_block
103:
104: fix_block_styles($root, \@all_block);
105: $root->normalize();
106:
107: fix_fonts($root, \@all_block);
108:
109: replace_u($root);
110:
111: remove_bad_cdata_sections($root);
112:
113: add_cdata_sections($root);
114:
115: fix_style_element($root);
116:
117: fix_tables($root);
118:
119: fix_lists($root);
120:
121: fix_wrong_name_for_img($root); # should be before replace_deprecated_attributes_by_css
122:
123: replace_deprecated_attributes_by_css($root);
124:
125: replace_center($root, \@all_block); # must come after replace_deprecated_attributes_by_css
126:
127: replace_nobr($root);
128:
129: remove_useless_notsolved($root);
130:
131: fix_paragraphs_inside($root, \@all_block);
132:
133: remove_empty_style($root);
134:
135: fix_empty_lc_elements($root);
136:
137: lowercase_attribute_values($root);
138:
139: replace_numericalresponse_unit_attribute($root);
140:
141: replace_functions_by_elements($root);
142:
143: pretty($root, \@all_block);
144:
145: replace_tm_dtm($root);
146:
147: return $dom_doc->toString(); # byte string !
148: }
149:
150: sub fix_structure {
151: my ($doc) = @_;
152: # the root element has already been added in pre_xml
153: my $root = $doc->documentElement;
154: # inside the root, replace html, problem and library elements by their content
155: my @toreplace = ('html','problem','library','Task');
156: foreach my $name (@toreplace) {
157: my @elements = $root->getElementsByTagName($name);
158: foreach my $element (@elements) {
159: replace_by_children($element);
160: }
161: }
162: # insert all link and style elements inside a new head element
163: my $current_node = undef;
164: my @heads = $doc->getElementsByTagName('head');
165: my @links = $doc->getElementsByTagName('link');
166: my @styles = $doc->getElementsByTagName('style');
167: my @titles = $doc->getElementsByTagName('title');
168: if (scalar(@titles) > 0) {
169: # NOTE: there is a title element in gnuplot, not to be confused with the one inside HTML head
170: for (my $i=0; $i<scalar(@titles); $i++) {
171: my $title = $titles[$i];
172: my $found_gnuplot = 0;
173: my $ancestor = $title->parentNode;
174: while (defined $ancestor) {
175: if ($ancestor->nodeName eq 'gnuplot') {
176: $found_gnuplot = 1;
177: last;
178: }
179: $ancestor = $ancestor->parentNode;
180: }
181: if ($found_gnuplot) {
182: splice(@titles, $i, 1);
183: $i--;
184: }
185: }
186: }
187: if (scalar(@heads) > 0 || scalar(@titles) > 0 || scalar(@links) > 0 || scalar(@styles) > 0) {
188: my $htmlhead = $doc->createElement('head');
189: foreach my $head (@heads) {
190: my $next;
191: for (my $child=$head->firstChild; defined $child; $child=$next) {
192: $next = $child->nextSibling;
193: $head->removeChild($child);
194: if ($child->nodeType != XML_ELEMENT_NODE ||
195: string_in_array(['title','script','style','meta','link','import','base'], $child->nodeName)) {
196: $htmlhead->appendChild($child);
197: } else {
198: # this should not be in head
199: insert_after_or_first($root, $child, $current_node);
200: }
201: }
202: $head->parentNode->removeChild($head);
203: }
204: foreach my $child (@titles, @links, @styles) {
205: $child->parentNode->removeChild($child);
206: $htmlhead->appendChild($child);
207: }
208: insert_after_or_first($root, $htmlhead, $current_node);
209: $current_node = $htmlhead;
210: }
211: # body
212: my $htmlbody = undef;
213: my @bodies = $doc->getElementsByTagName('body');
214: if (scalar(@bodies) > 0) {
215: # TODO: fix content and position of body elements
216: if ($root->nodeName eq 'problem') {
217: foreach my $body (@bodies) {
218: replace_by_children($body);
219: }
220: }
221: }
222: # add all the meta elements afterwards when they are LON-CAPA meta. Remove all HTML meta.
223: my @meta_names = ('abstract','author','authorspace','avetries','avetries_list','clear','comefrom','comefrom_list','copyright','correct','count','course','course_list','courserestricted','creationdate','dependencies','depth','difficulty','difficulty_list','disc','disc_list','domain','end','field','firstname','generation','goto','goto_list','groupname','helpful','highestgradelevel','hostname','id','keynum','keywords','language','lastname','lastrevisiondate','lowestgradelevel','middlename','mime','modifyinguser','notes','owner','permanentemail','scope','sequsage','sequsage_list','standards','start','stdno','stdno_list','subject','technical','title','url','username','value','version');
224: my @metas = $doc->getElementsByTagName('meta');
225: foreach my $meta (@metas) {
226: $meta->parentNode->removeChild($meta);
227: my $name = $meta->getAttribute('name');
228: my $content = $meta->getAttribute('content');
229: if (defined $name && defined $content && string_in_array(\@meta_names, lc($name))) {
230: my $lcmeta = $doc->createElement('meta');
231: $lcmeta->setAttribute('name', lc($name));
232: $lcmeta->setAttribute('content', $content);
233: insert_after_or_first($root, $lcmeta, $current_node);
234: $current_node = $lcmeta;
235: }
236: }
237: return($root);
238: }
239:
240: # insert the new child under parent after the reference child, or as the first child if the reference child is not defined
241: sub insert_after_or_first {
242: my ($parent, $newchild, $refchild) = @_;
243: if (defined $refchild) {
244: $parent->insertAfter($newchild, $refchild);
245: } elsif (defined $parent->firstChild) {
246: $parent->insertBefore($newchild, $parent->firstChild);
247: } else {
248: $parent->appendChild($newchild);
249: }
250: }
251:
252: # removes all elements with given names inside the node, but keep the content
253: sub remove_elements {
254: my ($node, $to_remove) = @_;
255: my $nextChild;
256: for (my $child=$node->firstChild; defined $child; $child=$nextChild) {
257: $nextChild = $child->nextSibling;
258: my $type = $node->nodeType;
259: if ($type == XML_ELEMENT_NODE) {
260: if (string_in_array($to_remove, $child->nodeName)) {
261: my $first_non_white = $child->firstChild;
262: if (defined $first_non_white && $first_non_white->nodeType == XML_TEXT_NODE &&
263: $first_non_white->nodeValue =~ /^\s*$/) {
264: $first_non_white = $first_non_white->nextSibling;
265: }
266: if (defined $first_non_white) {
267: $nextChild = $first_non_white;
268: replace_by_children($child);
269: } else {
270: $node->removeChild($child);
271: }
272: } else {
273: remove_elements($child, $to_remove);
274: }
275: }
276: }
277: }
278:
279: # removes some attributes that have an invalid empty value
280: sub remove_empty_attributes {
281: my ($root) = @_;
282: my $doc = $root->ownerDocument;
283: # this list is based on validation errors in the MSU subset (it could be more complete if it was based on the schema)
284: my @attributes = (
285: ['curve', ['pointsize']],
286: ['foil', ['location']],
287: ['foilgroup', ['checkboxoptions', 'options', 'texoptions']],
288: ['gnuplot', ['pattern', 'texwidth']],
289: ['img', ['height', 'texheight', 'texwidth', 'texwrap', 'width']],
290: ['import', ['importmode']],
291: ['optionresponse', ['max']],
292: ['organicstructure', ['options']],
293: ['radiobuttonresponse', ['max']],
294: ['randomlabel', ['height', 'texwidth', 'width']],
295: ['stringresponse', ['type']],
296: ['textline', ['size']],
297: );
298: foreach my $element_attributes (@attributes) {
299: my $element_name = $element_attributes->[0];
300: my $attribute_names = $element_attributes->[1];
301: my @elements = $doc->getElementsByTagName($element_name);
302: foreach my $element (@elements) {
303: foreach my $attribute_name (@$attribute_names) {
304: my $value = $element->getAttribute($attribute_name);
305: if (defined $value && $value =~ /^\s*$/) {
306: $element->removeAttribute($attribute_name);
307: }
308: }
309: }
310: }
311: }
312:
313: # fixes the case for a few attributes that are not all lowercase
314: # (the HTML parser used in html_to_xml turns everything lowercase, which is a good thing in general)
315: sub fix_attribute_case {
316: my ($root) = @_;
317: my $doc = $root->ownerDocument;
318: my @attributes = (
319: ['labelgroup', ['TeXsize']],
320: ['h1', ['TeXsize']],
321: ['h2', ['TeXsize']],
322: ['h3', ['TeXsize']],
323: ['h4', ['TeXsize']],
324: ['h5', ['TeXsize']],
325: ['h6', ['TeXsize']],
326: # font and basefont have a TeXsize but will be removed
327: ['optionresponse', ['TeXlayout']],
328: ['itemgroup', ['TeXitemgroupwidth']],
329: ['Task', ['OptionalRequired']],
330: ['Question', ['OptionalRequired','Mandatory']],
331: ['Instance', ['OptionalRequired','Disabled']],
332: ['Criteria', ['Mandatory']],
333: ['table', ['TeXwidth','TeXtheme']],
334: ['td', ['TeXwidth']],
335: ['th', ['TeXwidth']],
336: ['img', ['TeXwidth','TeXheight','TeXwrap']],
337: );
338: foreach my $element_attributes (@attributes) {
339: my $element_name = $element_attributes->[0];
340: my $attribute_names = $element_attributes->[1];
341: my @elements = $doc->getElementsByTagName($element_name);
342: foreach my $element (@elements) {
343: foreach my $attribute_name (@$attribute_names) {
344: my $value = $element->getAttribute(lc($attribute_name));
345: if (defined $value) {
346: $element->removeAttribute(lc($attribute_name));
347: $element->setAttribute($attribute_name, $value);
348: }
349: }
350: }
351: }
352: }
353:
354: # Replaces m by HTML, tm and/or dtm (which will be replaced by <m> later, but they are useful
355: # to know if the element is a block element or not).
356: # m might contain non-math LaTeX, while tm and dtm may only contain math.
357: sub replace_m {
358: my ($root) = @_;
359: my $doc = $root->ownerDocument;
360: # search for variable declarations
361: my @variables = ();
362: my @scripts = $root->getElementsByTagName('script');
363: foreach my $script (@scripts) {
364: my $type = $script->getAttribute('type');
365: if (defined $type && $type eq 'loncapa/perl') {
366: if (defined $script->firstChild && $script->firstChild->nodeType == XML_TEXT_NODE) {
367: my $text = $script->firstChild->nodeValue;
368: # NOTE: we are not interested in replacing "@value", only "$value"
369: # this regexp is for " $a = ..." and " $a[...] = ..."
370: while ($text =~ /^[ \t]*\$([a-zA-Z_0-9]+)(?:\[[^\]]+\])?[ \t]*=/gm) {
371: if (!string_in_array(\@variables, $1)) {
372: push(@variables, $1);
373: }
374: }
375: # this regexp is for "...; $a = ..." and "...; $a[...] = ..."
376: while ($text =~ /^[^'"\/;]+;[ \t]*\$([a-zA-Z_0-9]+)(?:\[[^\]]+\])?[ \t]*=/gm) {
377: if (!string_in_array(\@variables, $1)) {
378: push(@variables, $1);
379: }
380: }
381: # this regexp is for " @a = ..."
382: while ($text =~ /^[ \t]*\@([a-zA-Z_0-9]+)[ \t]*=/gm) {
383: if (!string_in_array(\@variables, $1)) {
384: push(@variables, $1);
385: }
386: }
387: # this regexp is for " ($a, $b, $c) = ..."
388: my @matches = ($text =~ /^[ \t]*\([ \t]*\$([a-zA-Z_0-9]+)(?:[ \t]*,[ \t]*\$([a-zA-Z_0-9]+))*[ \t]*\)[ \t]*=/gm);
389: foreach my $match (@matches) {
390: if (!defined $match) {
391: next; # not sure why it happens, but it does
392: }
393: if (!string_in_array(\@variables, $match)) {
394: push(@variables, $match);
395: }
396: }
397: # and this one is for "push @a"
398: while ($text =~ /^[ \t]*push @([a-zA-Z_0-9]+)[ \t,]*/gm) {
399: if (!string_in_array(\@variables, $1)) {
400: push(@variables, $1);
401: }
402: }
403: # use the opportunity to report usage of <m> in Perl scripts
404: if ($text =~ /^[^#].*<m[ >]/m) {
405: if ($warnings) {
406: print "WARNING: <m> is used in a script, it should be converted by hand\n";
407: }
408: }
409: }
410: }
411: }
412: my @ms = $root->getElementsByTagName('m');
413: foreach my $m (@ms) {
414: if (!defined $m->firstChild) {
415: $m->parentNode->removeChild($m);
416: next;
417: }
418: if (defined $m->firstChild->nextSibling || $m->firstChild->nodeType != XML_TEXT_NODE) {
419: if ($warnings) {
420: print "WARNING: m value is not simple text\n";
421: }
422: next;
423: }
424: my $text = $m->firstChild->nodeValue;
425: my $text_before_variable_replacement = $text;
426: my $var_key1 = 'dfhg3df54hg65hg4';
427: my $var_key2 = 'dfhg654d6f5g4h5f';
428: my $eval = defined $m->getAttribute('eval') && $m->getAttribute('eval') eq 'on';
429: if ($eval) {
430: # replace variables
431: foreach my $variable (@variables) {
432: my $replacement = $var_key1.$variable.$var_key2;
433: $text =~ s/\$$variable(?![a-zA-Z])/$replacement/ge;
434: $text =~ s/\$\{$variable\}/$replacement/ge;
435: }
436: }
437: # check if the expression is enclosed in math separators: $ $$ \( \) \[ \]
438: # if so, replace the whole node by dtm or tm
439: my $new_text;
440: my $new_node_name;
441: if ($text =~ /^\s*\$\$([^\$]*)\$\$\s*$/) {
442: $new_node_name = 'dtm';
443: $new_text = $1;
444: } elsif ($text =~ /^\s*\\\[(.*)\\\]\s*$/s) {
445: $new_node_name = 'dtm';
446: $new_text = $1;
447: } elsif ($text =~ /^\s*\$([^\$]*)\$\s*$/) {
448: $new_node_name = 'tm';
449: $new_text = $1;
450: } elsif ($text =~ /^\s*\\\((.*)\\\)\s*$/s) {
451: $new_node_name = 'tm';
452: $new_text = $1;
453: }
454: if (defined $new_node_name) {
455: if ($eval) {
456: foreach my $variable (@variables) {
457: my $replacement = $var_key1.$variable.$var_key2;
458: $new_text =~ s/$replacement([a-zA-Z])/\${$variable}$1/g;
459: $new_text =~ s/$replacement/\$$variable/g;
460: }
461: }
462: my $new_node = $doc->createElement($new_node_name);
463: if ($eval) {
464: $new_node->setAttribute('eval', 'on');
465: }
466: $new_node->appendChild($doc->createTextNode($new_text));
467: $m->parentNode->replaceChild($new_node, $m);
468: next;
469: }
470: if ($text !~ /\$|\\\(|\\\)|\\\[|\\\]/) {
471: # there are no math separators inside
472: # try to guess if this is meant as math
473: my $found_math = 0;
474: foreach my $symbol (@latex_math) {
475: if (index($text, $symbol) != -1) {
476: $found_math = 1;
477: last;
478: }
479: }
480: if ($found_math) {
481: # interpret the whole text as LaTeX inline math
482: my $new_node = $doc->createElement('tm');
483: if ($eval) {
484: $new_node->setAttribute('eval', 'on');
485: }
486: $new_node->appendChild($doc->createTextNode($text_before_variable_replacement));
487: $m->parentNode->replaceChild($new_node, $m);
488: next;
489: }
490: # no math symbol found, we will convert the text with tth
491: }
492:
493: # there are math separators inside, even after hiding variables, or there was no math symbol
494:
495: # hide math parts inside before running tth
496: my $math_key1 = '#ghjgdh5hg45gf';
497: my $math_key2 = '#';
498: my @maths = ();
499: my @separators = (['$$','$$'], ['\\(','\\)'], ['\\[','\\]'], ['$','$']);
500: foreach my $seps (@separators) {
501: my $sep1 = $seps->[0];
502: my $sep2 = $seps->[1];
503: my $pos1 = index($text, $sep1);
504: if ($pos1 == -1) {
505: next;
506: }
507: my $pos2 = index($text, $sep2, $pos1+length($sep1));
508: while ($pos1 != -1 && $pos2 != -1) {
509: my $replace = substr($text, $pos1, $pos2+length($sep2)-$pos1);
510: push(@maths, $replace);
511: my $by = $math_key1.scalar(@maths).$math_key2;
512: $text = substr($text, 0, $pos1).$by.substr($text, $pos2+length($sep2));
513: $pos1 = index($text, $sep1);
514: if ($pos1 != -1) {
515: $pos2 = index($text, $sep2, $pos1+length($sep1));
516: }
517: }
518: }
519: # get HTML as text from tth
520: my $html_text = tth($text);
521: # replace math by replacements
522: for (my $i=0; $i < scalar(@maths); $i++) {
523: my $math = $maths[$i];
524: $math =~ s/&/&/g;
525: $math =~ s/</</g;
526: $math =~ s/>/>/g;
527: if ($math =~ /^\$\$(.*)\$\$$/s) {
528: $math = '<dtm>'.$1.'</dtm>';
529: } elsif ($math =~ /^\\\[(.*)\\\]$/s) {
530: $math = '<dtm>'.$1.'</dtm>';
531: } elsif ($math =~ /^\\\((.*)\\\)$/s) {
532: $math = '<tm>'.$1.'</tm>';
533: } elsif ($math =~ /^\$(.*)\$$/s) {
534: $math = '<tm>'.$1.'</tm>';
535: }
536: my $replace = $math_key1.($i+1).$math_key2;
537: $html_text =~ s/$replace/$math/;
538: }
539: # replace variables if necessary
540: if ($eval) {
541: foreach my $variable (@variables) {
542: my $replacement = $var_key1.$variable.$var_key2;
543: $html_text =~ s/$replacement([a-zA-Z])/\${$variable}$1/g;
544: $html_text =~ s/$replacement/\$$variable/g;
545: }
546: }
547: my $fragment = html_to_dom($html_text);
548: $doc->adoptNode($fragment);
549: $m->parentNode->replaceChild($fragment, $m);
550:
551: }
552: }
553:
554: # Returns the HTML equivalent of LaTeX input, using tth
555: sub tth {
556: my ($text) = @_;
557: my $output = &tth::tth($text);
558: my $errorstring = &tth::ttherror();
559: if ($errorstring) {
560: die $errorstring;
561: }
562: # hopefully the temp file will not be removed before this point (otherwise we should use unlink_on_destroy 0)
563: $output =~ s/^\s*|\s*$//;
564: $output =~ s/<div class="p"><!----><\/div>/<br\/>/; # why is tth using such ugly markup for \newline ?
565: return $output;
566: }
567:
568: # transform simple HTML into a DOM fragment (which will need to be adopted by the document)
569: sub html_to_dom {
570: my ($text) = @_;
571: $text = '<root>'.$text.'</root>';
572: my $textref = Apache::html_to_xml::html_to_xml(\$text);
573: utf8::upgrade($$textref); # otherwise the XML parser fails when the HTML parser turns into a character
574: my $dom_doc = XML::LibXML->load_xml(string => $textref);
575: my $root = $dom_doc->documentElement;
576: remove_empty_style($root);
577: my $fragment = $dom_doc->createDocumentFragment();
578: my $next;
579: for (my $n=$root->firstChild; defined $n; $n=$next) {
580: $next = $n->nextSibling;
581: $root->removeChild($n);
582: $fragment->appendChild($n);
583: }
584: return($fragment);
585: }
586:
587: # Use the linked sty files to guess which newly defined elements should be considered blocks.
588: # Also adds to @containing_styles the sty elements that contain styles.
589: # @param {string} fn - the file path (we only extract the directory path from it)
590: # @param {string} res_dir - path of res directory parent (without the / at the end)
591: # @param {Element} root - the root element
592: sub add_sty_blocks {
593: my ($fn, $res_dir, $root, $all_block) = @_;
594: my $doc = $root->ownerDocument;
595: my @parserlibs = $doc->getElementsByTagName('parserlib');
596: my @libs = ();
597: foreach my $parserlib (@parserlibs) {
598: if (defined $parserlib->firstChild && $parserlib->firstChild->nodeType == XML_TEXT_NODE) {
599: my $value = $parserlib->firstChild->nodeValue;
600: $value =~ s/^\s+|\s+$//g;
601: if ($value ne '') {
602: push(@libs, $value);
603: }
604: }
605: }
606: my ($name, $path, $suffix) = fileparse($fn);
607: foreach my $sty (@libs) {
608: if (substr($sty, 0, 1) eq '/') {
609: $sty = $res_dir.$sty;
610: } else {
611: $sty = $path.$sty;
612: }
613: my $new_elements = parse_sty($sty, $all_block);
614: better_guess($root, $new_elements, $all_block);
615: my $new_blocks = $new_elements->{'block'};
616: my $new_inlines = $new_elements->{'inline'};
617: push(@$all_block, @{$new_blocks});
618: #push(@inlines, @{$new_inlines}); # we are not using a list of inline elements at this point
619: }
620: }
621:
622: ##
623: # Parses a sty file and returns lists of block and inline elements.
624: # @param {string} fn - the file path
625: ##
626: sub parse_sty {
627: my ($fn, $all_block) = @_;
628: my @blocks = ();
629: my @inlines = ();
630: my $p = HTML::TokeParser->new($fn);
631: if (! $p) {
632: die "post_xml.pl: parse_sty: Error reading $fn\n";
633: }
634: $p->empty_element_tags(1);
635: my $in_definetag = 0;
636: my $in_render = 0;
637: my %newtags = ();
638: my $newtag = '';
639: my $is_block = 0;
640: while (my $token = $p->get_token) {
641: if ($token->[0] eq 'S') {
642: my $tag = lc($token->[1]);
643: if ($tag eq 'definetag') {
644: $in_definetag = 1;
645: $is_block = 0;
646: my $attributes = $token->[2];
647: $newtag = $attributes->{'name'};
648: if (substr($newtag, 0, 1) eq '/') {
649: $newtag = substr($newtag, 1);
650: }
651: } elsif ($in_definetag && $tag eq 'render') {
652: $in_render = 1;
653: $is_block = 0;
654: } elsif ($in_render) {
655: if (string_in_array($all_block, $tag)) {
656: $is_block = 1;
657: }
658: }
659: } elsif ($token->[0] eq 'E') {
660: my $tag = lc($token->[1]);
661: if ($tag eq 'definetag') {
662: $in_definetag = 0;
663: if (defined $newtags{$newtag}) {
664: $newtags{$newtag} = $newtags{$newtag} || $is_block;
665: } else {
666: $newtags{$newtag} = $is_block;
667: }
668: } elsif ($in_definetag && $tag eq 'render') {
669: $in_render = 0;
670: }
671: }
672: }
673: foreach $newtag (keys(%newtags)) {
674: if ($newtags{$newtag} == 1) {
675: push(@blocks, $newtag);
676: } else {
677: push(@inlines, $newtag);
678: }
679: }
680: return {'block'=>\@blocks, 'inline'=>\@inlines};
681: }
682:
683: ##
684: # Marks as block the elements that contain block elements in the input file.
685: # Also adds to @containing_styles the sty elements that contain styles.
686: # @param {string} fn - the file path
687: # @param {Hash<string,Array>} new_elements - contains arrays in 'block' and 'inline'
688: ##
689: sub better_guess {
690: my ($root, $new_elements, $all_block) = @_;
691: my $new_blocks = $new_elements->{'block'};
692: my $new_inlines = $new_elements->{'inline'};
693:
694: my @change = (); # change these elements from inline to block
695: foreach my $tag (@{$new_inlines}) {
696: my @nodes = $root->getElementsByTagName($tag);
697: NODE_LOOP: foreach my $node (@nodes) {
698: for (my $child=$node->firstChild; defined $child; $child=$child->nextSibling) {
699: if ($child->nodeType == XML_ELEMENT_NODE) {
700: if (string_in_array($all_block, $child->nodeName) || string_in_array($new_blocks, $child->nodeName)) {
701: push(@change, $tag);
702: last NODE_LOOP;
703: }
704: }
705: }
706: }
707: }
708: foreach my $inline (@change) {
709: my $index = 0;
710: $index++ until $new_inlines->[$index] eq $inline;
711: splice(@{$new_inlines}, $index, 1);
712: push(@{$new_blocks}, $inline);
713: }
714: # add to @containing_styles when a style is used inside
715: # NOTE: some sty elements will be added even though they should not, but if we don't do that
716: # all style will be removed in the sty elements.
717: foreach my $tag ((@{$new_blocks}, @{$new_inlines})) {
718: my @nodes = $root->getElementsByTagName($tag);
719: NODE_LOOP: foreach my $node (@nodes) {
720: for (my $child=$node->firstChild; defined $child; $child=$child->nextSibling) {
721: if ($child->nodeType == XML_ELEMENT_NODE) {
722: if (string_in_array(\@html_styles, $child->nodeName)) {
723: push(@containing_styles, $tag);
724: last NODE_LOOP;
725: }
726: }
727: }
728: }
729: }
730: }
731:
732: # When a style element contains a block, move the style inside the block where it is allowed.
733: # style/block/other -> block/style/other
734: # When a style is used where it is not allowed, move it inside its children or remove it (unless it contains only text)
735: # element_not_containing_styles/style/other -> element_not_containing_styles/other/style (except if other is a style)
736: # The fix is not perfect in the case of element_not_containing_styles/style1/style2/block/text (style1 will be lost):
737: # element_not_containing_styles/style1/style2/block/text -> element_not_containing_styles/block/style2/text
738: # (a solution to this problem would be to merge the styles in a span)
739: # NOTE: .sty defined elements might have been added to @containing_styles by better_guess().
740: sub fix_block_styles {
741: my ($element, $all_block) = @_;
742: my $doc = $element->ownerDocument;
743: if (string_in_array(\@html_styles, $element->nodeName)) {
744: # move spaces out of the style element
745: if (defined $element->firstChild && $element->firstChild->nodeType == XML_TEXT_NODE) {
746: my $child = $element->firstChild;
747: if ($child->nodeValue =~ /^(\s+)(\S.*)$/s) {
748: $element->parentNode->insertBefore($doc->createTextNode($1), $element);
749: $child->setData($2);
750: }
751: }
752: if (defined $element->lastChild && $element->lastChild->nodeType == XML_TEXT_NODE) {
753: my $child = $element->lastChild;
754: if ($child->nodeValue =~ /^(.*\S)(\s+)$/s) {
755: $element->parentNode->insertAfter($doc->createTextNode($2), $element);
756: $child->setData($1);
757: }
758: }
759:
760: my $found_block = 0;
761: for (my $child=$element->firstChild; defined $child; $child=$child->nextSibling) {
762: if ($child->nodeType == XML_ELEMENT_NODE && string_in_array($all_block, $child->nodeName)) {
763: $found_block = 1;
764: last;
765: }
766: }
767: my $no_style_here = !string_in_array(\@containing_styles, $element->parentNode->nodeName);
768: if ($found_block || $no_style_here) {
769: # there is a block or the style is not allowed here,
770: # the style element has to be replaced by its modified children
771: my $s; # a clone of the style
772: my $next;
773: for (my $child=$element->firstChild; defined $child; $child=$next) {
774: $next = $child->nextSibling;
775: if ($child->nodeType == XML_ELEMENT_NODE && (string_in_array($all_block, $child->nodeName) ||
776: $child->nodeName eq 'br' || $no_style_here)) {
777: # avoid inverting a style with a style with $no_style_here (that would cause endless recursion)
778: if (!$no_style_here || (!string_in_array(\@html_styles, $child->nodeName) &&
779: string_in_array(\@containing_styles, $child->nodeName))) {
780: # block node or inline node when the style is not allowed:
781: # move all children inside the style, and make the style the only child
782: $s = $element->cloneNode();
783: my $next2;
784: for (my $child2=$child->firstChild; defined $child2; $child2=$next2) {
785: $next2 = $child2->nextSibling;
786: $child->removeChild($child2);
787: $s->appendChild($child2);
788: }
789: $child->appendChild($s);
790: }
791: $s = undef;
792: } elsif (($child->nodeType == XML_TEXT_NODE && $child->nodeValue !~ /^\s*$/) ||
793: $child->nodeType == XML_ELEMENT_NODE) {
794: # if the style is allowed, move text and inline nodes inside the style
795: if (!$no_style_here) {
796: if (!defined $s) {
797: $s = $element->cloneNode();
798: $element->insertBefore($s, $child);
799: }
800: $element->removeChild($child);
801: $s->appendChild($child);
802: }
803: } else {
804: # do not put other nodes inside the style
805: $s = undef;
806: }
807: }
808: # now replace by children and fix them
809: my $parent = $element->parentNode;
810: for (my $child=$element->firstChild; defined $child; $child=$next) {
811: $next = $child->nextSibling;
812: $element->removeChild($child);
813: $parent->insertBefore($child, $element);
814: if ($child->nodeType == XML_ELEMENT_NODE) {
815: fix_block_styles($child, $all_block);
816: }
817: }
818: $parent->removeChild($element);
819: return;
820: }
821: }
822: # otherwise fix all children
823: my $next;
824: for (my $child=$element->firstChild; defined $child; $child=$next) {
825: $next = $child->nextSibling;
826: if ($child->nodeType == XML_ELEMENT_NODE) {
827: fix_block_styles($child, $all_block);
828: }
829: }
830: }
831:
832: # removes empty font elements and font elements that contain at least one block element
833: # replaces other font elements by equivalent span
834: sub fix_fonts {
835: my ($root, $all_block) = @_;
836: my $doc = $root->ownerDocument;
837: my @fonts = $root->getElementsByTagName('font');
838: @fonts = reverse(@fonts); # to deal with the ancestor last in the case of font/font
839: foreach my $font (@fonts) {
840: my $block = 0;
841: for (my $child=$font->firstChild; defined $child; $child=$child->nextSibling) {
842: if (string_in_array($all_block, $child->nodeName) || string_in_array(\@inline_like_block, $child->nodeName)) {
843: $block = 1;
844: last;
845: }
846: }
847: if (!defined $font->firstChild || $block) {
848: # empty font or font containing block elements
849: # replace this node by its content
850: replace_by_children($font);
851: } else {
852: # replace by equivalent span
853: my $color = get_non_empty_attribute($font, 'color');
854: my $size = get_non_empty_attribute($font, 'size');
855: my $face = get_non_empty_attribute($font, 'face');
856: if (defined $face) {
857: $face =~ s/^,|,$//;
858: }
859: if (!defined $color && !defined $size && !defined $face) {
860: # useless font element: replace this node by its content
861: replace_by_children($font);
862: next;
863: }
864: my $replacement;
865: tie (my %properties, 'Tie::IxHash', ());
866: if (!defined $color && !defined $size && defined $face && lc($face) eq 'symbol') {
867: $replacement = $doc->createDocumentFragment();
868: } else {
869: $replacement = $doc->createElement('span');
870: my $css = '';
871: if (defined $color) {
872: $color =~ s/^x/#/;
873: $properties{'color'} = $color;
874: }
875: if (defined $size) {
876: my %hash = (
877: '1' => 'x-small',
878: '2' => 'small',
879: '3' => 'medium',
880: '4' => 'large',
881: '5' => 'x-large',
882: '6' => 'xx-large',
883: '7' => '300%',
884: '-1' => 'small',
885: '-2' => 'x-small',
886: '+1' => 'large',
887: '+2' => 'x-large',
888: '+3' => 'xx-large',
889: '+4' => '300%',
890: );
891: my $value = $hash{$size};
892: if (!defined $value) {
893: $value = 'medium';
894: }
895: $properties{'font-size'} = $value;
896: }
897: if (defined $face) {
898: if (lc($face) ne 'symbol' && lc($face) ne 'bold') {
899: $properties{'font-family'} = $face;
900: }
901: }
902: set_css_properties($replacement, \%properties);
903: }
904: if (defined $face && lc($face) eq 'symbol') {
905: # convert all content to unicode
906: my $next;
907: for (my $child=$font->firstChild; defined $child; $child=$next) {
908: $next = $child->nextSibling;
909: if ($child->nodeType == XML_TEXT_NODE) {
910: my $value = $child->nodeValue;
911: $value =~ tr/ABGDEZHQIKLMNXOPRSTUFCYWabgdezhqiklmnxoprVstufcywJjv¡«¬®/ΑΒΓΔΕΖΗΘΙΚΛΜΝΞΟΠΡΣΤΥΦΧΨΩαβγδεζηθικλμνξοπρςστυφχψωϑϕϖϒ↔←→/;
912: $child->setData($value);
913: }
914: }
915: }
916: # replace the font node
917: if ($replacement->nodeType == XML_ELEMENT_NODE && !defined $font->previousSibling &&
918: !defined $font->nextSibling && string_in_array(\@accepting_style, $font->parentNode->nodeName)) {
919: # use CSS on the parent block and replace font by its children instead of using a new element
920: set_css_properties($font->parentNode, \%properties);
921: replace_by_children($font);
922: } else {
923: # move all font children inside the replacement (span or fragment)
924: my $next;
925: for (my $child=$font->firstChild; defined $child; $child=$next) {
926: $next = $child->nextSibling;
927: $font->removeChild($child);
928: $replacement->appendChild($child);
929: }
930: # replace font
931: $font->parentNode->replaceChild($replacement, $font);
932: }
933: }
934: }
935: $root->normalize();
936: }
937:
938: # replaces u by <span style="text-decoration: underline">
939: sub replace_u {
940: my ($root) = @_;
941: my $doc = $root->ownerDocument;
942: my @us = $root->getElementsByTagName('u');
943: foreach my $u (@us) {
944: my $span = $doc->createElement('span');
945: $span->setAttribute('style', 'text-decoration: underline');
946: my $next;
947: for (my $child=$u->firstChild; defined $child; $child=$next) {
948: $next = $child->nextSibling;
949: $u->removeChild($child);
950: $span->appendChild($child);
951: }
952: $u->parentNode->replaceChild($span, $u);
953: }
954: }
955:
956: # removes CDATA sections tags that have not been parsed correcty by the HTML parser
957: # also removes bad comments in script elements
958: sub remove_bad_cdata_sections {
959: my ($root) = @_;
960: my $doc = $root->ownerDocument;
961: foreach my $name (@preserve_elements) {
962: my @nodes = $root->getElementsByTagName($name);
963: foreach my $node (@nodes) {
964: if (defined $node->firstChild && $node->firstChild->nodeType == XML_TEXT_NODE) {
965: my $value = $node->firstChild->nodeValue;
966: if ($name eq 'script' && (!defined $node->getAttribute('type') || $node->getAttribute('type') ne 'loncapa/perl') &&
967: !defined $node->firstChild->nextSibling && $value =~ /^(\s*)<!--(.*)-->(\s*)$/) {
968: # web browsers interpret that as a real comment when it is on 1 line, but the Perl HTML parser thinks it is the script
969: # -> turning it back into a comment
970: # (this is only true for Javascript script elements, since LON-CAPA does not parse loncapa/perl scripts in the same way)
971: $node->removeChild($node->firstChild);
972: $node->appendChild($doc->createComment($2));
973: next;
974: }
975: # at the beginning:
976: $value =~ s/^(\s*)<!\[CDATA\[/$1/; # <![CDATA[
977: $value =~ s/^(\s*)\/\*\s*<!\[CDATA\[\s*\*\//$1/; # /* <![CDATA[ */
978: $value =~ s/^(\s*)\/\/\s*<!\[CDATA\[/$1/; # // <![CDATA[
979: $value =~ s/^(\s*)(\/\/)?\s*<!--/$1/; # // <!--
980: # at the end:
981: $value =~ s/\/\/\s*\]\]>(\s*)$/$1/; # // ]]>
982: $value =~ s/\]\]>(\s*)$/$1/; # ]]>
983: $value =~ s/(\/\/)?\s*-->(\s*)$/$2/; # // -->
984: $value =~ s/\/\*\s*\]\]>\s*\*\/(\s*)$/$1/; # /* ]]> */
985:
986: $value = "\n".$value."\n";
987: $value =~ s/\s*(\n[ \t]*)/$1/;
988: $value =~ s/\s+$/\n/;
989: $node->firstChild->setData($value);
990: }
991: }
992: }
993: }
994:
995: # adds CDATA sections to scripts
996: sub add_cdata_sections {
997: my ($root) = @_;
998: my $doc = $root->ownerDocument;
999: my @scripts = $root->getElementsByTagName('script');
1000: my @answers = $root->getElementsByTagName('answer');
1001: foreach my $answer (@answers) {
1002: my $ancestor = $answer->parentNode;
1003: my $found_capa_response = 0;
1004: while (defined $ancestor) {
1005: if ($ancestor->nodeName eq 'numericalresponse' || $ancestor->nodeName eq 'formularesponse') {
1006: $found_capa_response = 1;
1007: last;
1008: }
1009: $ancestor = $ancestor->parentNode;
1010: }
1011: if (!$found_capa_response) {
1012: push(@scripts, $answer);
1013: }
1014: }
1015: foreach my $script (@scripts) {
1016: # use a CDATA section in the normal situation, for any script
1017: my $first = $script->firstChild;
1018: if (defined $first && $first->nodeType == XML_TEXT_NODE && !defined $first->nextSibling) {
1019: my $cdata = $doc->createCDATASection($first->nodeValue);
1020: $script->replaceChild($cdata, $first);
1021: }
1022: }
1023: }
1024:
1025: # removes "<!--" and "-->" at the beginning and end of style elements
1026: sub fix_style_element {
1027: my ($root) = @_;
1028: my @styles = $root->getElementsByTagName('style');
1029: foreach my $style (@styles) {
1030: if (defined $style->firstChild && $style->firstChild->nodeType == XML_TEXT_NODE &&
1031: !defined $style->firstChild->nextSibling) {
1032: my $text = $style->firstChild->nodeValue;
1033: if ($text =~ /^\s*<!--(.*)-->\s*$/s) {
1034: $style->firstChild->setData($1);
1035: }
1036: }
1037: }
1038: }
1039:
1040: # create missing cells at the end of table rows
1041: sub fix_tables {
1042: my ($root) = @_;
1043: my @tables = $root->getElementsByTagName('table');
1044: foreach my $table (@tables) {
1045: fix_cells($table);
1046: foreach my $tbody ($table->getChildrenByTagName('tbody')) {
1047: fix_cells($tbody);
1048: }
1049: foreach my $thead ($table->getChildrenByTagName('thead')) {
1050: fix_cells($thead);
1051: }
1052: foreach my $tfoot ($table->getChildrenByTagName('tfoot')) {
1053: fix_cells($tfoot);
1054: }
1055: }
1056: }
1057:
1058: # create missing cells at the end of table rows
1059: sub fix_cells {
1060: my ($table) = @_; # could actually be table, tbody, thead or tfoot
1061: my $doc = $table->ownerDocument;
1062: my @nb_cells = ();
1063: my $max_nb_cells = 0;
1064: my @rowspans = ();
1065: my @trs = $table->getChildrenByTagName('tr');
1066: foreach my $tr (@trs) {
1067: my $nb_cells;
1068: if (defined $rowspans[0]) {
1069: $nb_cells = shift(@rowspans);
1070: } else {
1071: $nb_cells = 0;
1072: }
1073: for (my $cell=$tr->firstChild; defined $cell; $cell=$cell->nextSibling) {
1074: if ($cell->nodeName eq 'td' || $cell->nodeName eq 'th') {
1075: my $colspan = $cell->getAttribute('colspan');
1076: if (defined $colspan && $colspan =~ /^\s*[0-9]+\s*$/) {
1077: $nb_cells += $colspan;
1078: } else {
1079: $nb_cells++;
1080: }
1081: my $rowspan = $cell->getAttribute('rowspan');
1082: if (defined $rowspan && $rowspan =~ /^\s*[0-9]+\s*$/) {
1083: for (my $i=0; $i < $rowspan-1; $i++) {
1084: if (!defined $rowspans[$i]) {
1085: $rowspans[$i] = 1;
1086: } else {
1087: $rowspans[$i]++;
1088: }
1089: }
1090: }
1091: }
1092: }
1093: push(@nb_cells, $nb_cells);
1094: if ($nb_cells > $max_nb_cells) {
1095: $max_nb_cells = $nb_cells;
1096: }
1097: }
1098: foreach my $tr (@trs) {
1099: my $nb_cells = shift(@nb_cells);
1100: if ($nb_cells < $max_nb_cells) {
1101: for (1..($max_nb_cells - $nb_cells)) {
1102: $tr->appendChild($doc->createElement('td'));
1103: }
1104: }
1105: }
1106: }
1107:
1108: # replaces ul/ul by ul/li/ul and the same for ol (using the previous li if possible)
1109: # also adds a ul element when a li has no ul/ol ancestor
1110: sub fix_lists {
1111: my ($root) = @_;
1112: my $doc = $root->ownerDocument;
1113: my @uls = $root->getElementsByTagName('ul');
1114: my @ols = $root->getElementsByTagName('ol');
1115: my @lists = (@uls, @ols);
1116: foreach my $list (@lists) {
1117: my $next;
1118: for (my $child=$list->firstChild; defined $child; $child=$next) {
1119: $next = $child->nextSibling;
1120: if ($child->nodeType == XML_ELEMENT_NODE && string_in_array(['ul','ol'], $child->nodeName)) {
1121: my $previous = $child->previousNonBlankSibling(); # note: non-DOM method
1122: $list->removeChild($child);
1123: if (defined $previous && $previous->nodeType == XML_ELEMENT_NODE && $previous->nodeName eq 'li') {
1124: $previous->appendChild($child);
1125: } else {
1126: my $li = $doc->createElement('li');
1127: $li->appendChild($child);
1128: if (!defined $next) {
1129: $list->appendChild($li);
1130: } else {
1131: $list->insertBefore($li, $next);
1132: }
1133: }
1134: }
1135: }
1136: }
1137: my @lis = $root->getElementsByTagName('li');
1138: foreach my $li (@lis) {
1139: my $found_list_ancestor = 0;
1140: my $ancestor = $li->parentNode;
1141: while (defined $ancestor) {
1142: if ($ancestor->nodeName eq 'ul' || $ancestor->nodeName eq 'ol') {
1143: $found_list_ancestor = 1;
1144: last;
1145: }
1146: $ancestor = $ancestor->parentNode;
1147: }
1148: if (!$found_list_ancestor) {
1149: # replace li by ul and add li under ul
1150: my $ul = $doc->createElement('ul');
1151: $li->parentNode->insertBefore($ul, $li);
1152: $li->parentNode->removeChild($li);
1153: $ul->appendChild($li);
1154: # add all other li afterwards inside ul (there might be text nodes in-between)
1155: my $next = $ul->nextSibling;
1156: while (defined $next) {
1157: my $next_next = $next->nextSibling;
1158: if ($next->nodeType == XML_TEXT_NODE && $next->nodeValue =~ /^\s*$/ &&
1159: defined $next_next && $next_next->nodeType == XML_ELEMENT_NODE && $next_next->nodeName eq 'li') {
1160: $next->parentNode->removeChild($next);
1161: $ul->appendChild($next);
1162: $next = $next_next;
1163: $next_next = $next_next->nextSibling;
1164: }
1165: if ($next->nodeType == XML_ELEMENT_NODE && $next->nodeName eq 'li') {
1166: $next->parentNode->removeChild($next);
1167: $ul->appendChild($next);
1168: } else {
1169: last;
1170: }
1171: $next = $next_next;
1172: }
1173: }
1174: }
1175: }
1176:
1177: # Some "image" elements are actually img element with a wrong name. This renames them.
1178: # Amazingly enough, "<image src=..." displays an image in some browsers
1179: # ("image" has existed at some point as an experimental HTML element).
1180: sub fix_wrong_name_for_img {
1181: my ($root) = @_;
1182: my @images = $root->getElementsByTagName('image');
1183: foreach my $image (@images) {
1184: if (!defined $image->getAttribute('src')) {
1185: next;
1186: }
1187: my $found_correct_ancestor = 0;
1188: my $ancestor = $image->parentNode;
1189: while (defined $ancestor) {
1190: if ($ancestor->nodeName eq 'drawimage' || $ancestor->nodeName eq 'imageresponse') {
1191: $found_correct_ancestor = 1;
1192: last;
1193: }
1194: $ancestor = $ancestor->parentNode;
1195: }
1196: if ($found_correct_ancestor) {
1197: next;
1198: }
1199: # this really has to be renamed "img"
1200: $image->setNodeName('img');
1201: }
1202: }
1203:
1204: # Replaces many deprecated attributes and replaces them by equivalent CSS when possible
1205: sub replace_deprecated_attributes_by_css {
1206: my ($root) = @_;
1207:
1208: fix_deprecated_in_tables($root);
1209:
1210: fix_deprecated_in_table_rows($root);
1211:
1212: fix_deprecated_in_table_cells($root);
1213:
1214: fix_deprecated_in_lists($root);
1215:
1216: fix_deprecated_in_list_items($root);
1217:
1218: fix_deprecated_in_hr($root);
1219:
1220: fix_deprecated_in_img($root);
1221:
1222: fix_deprecated_in_body($root);
1223:
1224: fix_align_attribute($root);
1225: }
1226:
1227: # Replaces deprecated attributes in tables
1228: sub fix_deprecated_in_tables {
1229: my ($root) = @_;
1230: my @tables = $root->getElementsByTagName('table');
1231: foreach my $table (@tables) {
1232: tie (my %new_properties, 'Tie::IxHash', ());
1233: my $align = $table->getAttribute('align');
1234: if (defined $align) {
1235: $table->removeAttribute('align');
1236: $align = lc(trim($align));
1237: }
1238: if ($table->parentNode->nodeName eq 'center' || (defined $align && $align eq 'center') ||
1239: (defined $table->parentNode->getAttribute('align') && $table->parentNode->getAttribute('align') eq 'center')) {
1240: $new_properties{'margin-left'} = 'auto';
1241: $new_properties{'margin-right'} = 'auto';
1242: }
1243: if (defined $align && ($align eq 'left' || $align eq 'right')) {
1244: $new_properties{'float'} = $align;
1245: }
1246: my $width = $table->getAttribute('width');
1247: if (defined $width) {
1248: $table->removeAttribute('width');
1249: $width = trim($width);
1250: if ($width =~ /^[0-9]+$/) {
1251: $width .= 'px';
1252: }
1253: if ($width ne '') {
1254: $new_properties{'width'} = $width;
1255: }
1256: }
1257: my $height = $table->getAttribute('height');
1258: if (defined $height) {
1259: $table->removeAttribute('height');
1260: # no replacement for table height
1261: }
1262: my $bgcolor = $table->getAttribute('bgcolor');
1263: if (defined $bgcolor) {
1264: $table->removeAttribute('bgcolor');
1265: $bgcolor = trim($bgcolor);
1266: $bgcolor =~ s/^x\s*//;
1267: if ($bgcolor ne '') {
1268: $new_properties{'background-color'} = $bgcolor;
1269: }
1270: }
1271: my $frame = $table->getAttribute('frame');
1272: if (defined $frame) {
1273: $table->removeAttribute('frame');
1274: $frame = lc(trim($frame));
1275: if ($frame eq 'void') {
1276: $new_properties{'border'} = 'none';
1277: } elsif ($frame eq 'above') {
1278: $new_properties{'border-top'} = '1px solid black';
1279: } elsif ($frame eq 'below') {
1280: $new_properties{'border-bottom'} = '1px solid black';
1281: } elsif ($frame eq 'hsides') {
1282: $new_properties{'border-top'} = '1px solid black';
1283: $new_properties{'border-bottom'} = '1px solid black';
1284: } elsif ($frame eq 'vsides') {
1285: $new_properties{'border-left'} = '1px solid black';
1286: $new_properties{'border-right'} = '1px solid black';
1287: } elsif ($frame eq 'lhs') {
1288: $new_properties{'border-left'} = '1px solid black';
1289: } elsif ($frame eq 'rhs') {
1290: $new_properties{'border-right'} = '1px solid black';
1291: } elsif ($frame eq 'box') {
1292: $new_properties{'border'} = '1px solid black';
1293: } elsif ($frame eq 'border') {
1294: $new_properties{'border'} = '1px solid black';
1295: }
1296: }
1297: if (scalar(keys %new_properties) > 0) {
1298: set_css_properties($table, \%new_properties);
1299: }
1300: # we can't replace the border attribute without creating a style block, but we can improve things like border="BORDER"
1301: my $border = $table->getAttribute('border');
1302: if (defined $border) {
1303: $border = trim($border);
1304: if ($border !~ /^\s*[0-9]+\s*(px)?\s*$/) {
1305: $table->setAttribute('border', '1');
1306: }
1307: }
1308: }
1309:
1310: }
1311:
1312: # Replaces deprecated attributes in tr elements
1313: sub fix_deprecated_in_table_rows {
1314: my ($root) = @_;
1315: my @trs = $root->getElementsByTagName('tr');
1316: foreach my $tr (@trs) {
1317: my $old_properties = get_css_properties($tr);
1318: tie (my %new_properties, 'Tie::IxHash', ());
1319: my $bgcolor = $tr->getAttribute('bgcolor');
1320: if (defined $bgcolor) {
1321: $tr->removeAttribute('bgcolor');
1322: if (!defined $old_properties->{'background-color'}) {
1323: $bgcolor = trim($bgcolor);
1324: $bgcolor =~ s/^x\s*//;
1325: if ($bgcolor ne '') {
1326: $new_properties{'background-color'} = $bgcolor;
1327: }
1328: }
1329: }
1330: my $align = $tr->getAttribute('align');
1331: if (defined $align && $align !~ /\s*char\s*/i) {
1332: $tr->removeAttribute('align');
1333: if (!defined $old_properties->{'text-align'}) {
1334: $align = lc(trim($align));
1335: if ($align ne '') {
1336: $new_properties{'text-align'} = $align;
1337: }
1338: }
1339: }
1340: my $valign = $tr->getAttribute('valign');
1341: if (defined $valign) {
1342: $tr->removeAttribute('valign');
1343: if (!defined $old_properties->{'vertical-align'}) {
1344: $valign = lc(trim($valign));
1345: if ($valign ne '') {
1346: $new_properties{'vertical-align'} = $valign;
1347: }
1348: }
1349: }
1350: if (scalar(keys %new_properties) > 0) {
1351: set_css_properties($tr, \%new_properties);
1352: }
1353: }
1354: }
1355:
1356: # Replaces deprecated attributes in table cells (td and th)
1357: sub fix_deprecated_in_table_cells {
1358: my ($root) = @_;
1359: my @tds = $root->getElementsByTagName('td');
1360: my @ths = $root->getElementsByTagName('th');
1361: my @cells = (@tds, @ths);
1362: foreach my $cell (@cells) {
1363: my $old_properties = get_css_properties($cell);
1364: tie (my %new_properties, 'Tie::IxHash', ());
1365: my $width = $cell->getAttribute('width');
1366: if (defined $width) {
1367: $cell->removeAttribute('width');
1368: if (!defined $old_properties->{'width'}) {
1369: $width = trim($width);
1370: if ($width =~ /^[0-9]+$/) {
1371: $width .= 'px';
1372: }
1373: if ($width ne '') {
1374: $new_properties{'width'} = $width;
1375: }
1376: }
1377: }
1378: my $height = $cell->getAttribute('height');
1379: if (defined $height) {
1380: $cell->removeAttribute('height');
1381: if (!defined $old_properties->{'height'}) {
1382: $height = trim($height);
1383: if ($height =~ /^[0-9]+$/) {
1384: $height .= 'px';
1385: }
1386: if ($height ne '') {
1387: $new_properties{'height'} = $height;
1388: }
1389: }
1390: }
1391: my $bgcolor = $cell->getAttribute('bgcolor');
1392: if (defined $bgcolor) {
1393: $cell->removeAttribute('bgcolor');
1394: if (!defined $old_properties->{'background-color'}) {
1395: $bgcolor = trim($bgcolor);
1396: $bgcolor =~ s/^x\s*//;
1397: if ($bgcolor ne '') {
1398: $new_properties{'background-color'} = $bgcolor;
1399: }
1400: }
1401: }
1402: my $align = $cell->getAttribute('align');
1403: if (defined $align && $align !~ /\s*char\s*/i) {
1404: $cell->removeAttribute('align');
1405: if (!defined $old_properties->{'text-align'}) {
1406: $align = lc(trim($align));
1407: if ($align ne '') {
1408: $new_properties{'text-align'} = $align;
1409: }
1410: }
1411: }
1412: my $valign = $cell->getAttribute('valign');
1413: if (defined $valign) {
1414: $cell->removeAttribute('valign');
1415: if (!defined $old_properties->{'vertical-align'}) {
1416: $valign = lc(trim($valign));
1417: if ($valign ne '') {
1418: $new_properties{'vertical-align'} = $valign;
1419: }
1420: }
1421: }
1422: if (scalar(keys %new_properties) > 0) {
1423: set_css_properties($cell, \%new_properties);
1424: }
1425: }
1426: }
1427:
1428: # Replaces deprecated attributes in lists (ul and ol)
1429: sub fix_deprecated_in_lists {
1430: my ($root) = @_;
1431: my @uls = $root->getElementsByTagName('ul');
1432: my @ols = $root->getElementsByTagName('ol');
1433: my @lists = (@uls, @ols);
1434: foreach my $list (@lists) {
1435: my $type = $list->getAttribute('type');
1436: if (defined $type) {
1437: my $lst = list_style_type($type);
1438: if (defined $lst) {
1439: $list->removeAttribute('type');
1440: if (!defined get_css_property($list, 'list-style-type')) {
1441: set_css_property($list, 'list-style-type', $lst);
1442: }
1443: }
1444: }
1445: }
1446: }
1447:
1448: # Replaces deprecated attributes in list items (li)
1449: sub fix_deprecated_in_list_items {
1450: my ($root) = @_;
1451: my @lis = $root->getElementsByTagName('li');
1452: foreach my $li (@lis) {
1453: my $type = $li->getAttribute('type');
1454: if (defined $type) {
1455: my $lst = list_style_type($type);
1456: if (defined $lst) {
1457: $li->removeAttribute('type');
1458: if (!defined get_css_property($li, 'list-style-type')) {
1459: set_css_property($li, 'list-style-type', $lst);
1460: }
1461: }
1462: }
1463: }
1464: }
1465:
1466: # returns the CSS list-style-type value equivalent to the given type attribute for a list or list item
1467: sub list_style_type {
1468: my ($type) = @_;
1469: my $value;
1470: $type = trim($type);
1471: if (lc($type) eq 'circle') {
1472: $value = 'circle';
1473: } elsif (lc($type) eq 'disc') {
1474: $value = 'disc';
1475: } elsif (lc($type) eq 'square') {
1476: $value = 'square';
1477: } elsif ($type eq 'a') {
1478: $value = 'lower-latin';
1479: } elsif ($type eq 'A') {
1480: $value = 'upper-latin';
1481: } elsif ($type eq 'i') {
1482: $value = 'lower-roman';
1483: } elsif ($type eq 'I') {
1484: $value = 'upper-roman';
1485: } elsif ($type eq '1') {
1486: $value = 'decimal';
1487: }
1488: return $value;
1489: }
1490:
1491: # Replaces deprecated attributes in hr
1492: sub fix_deprecated_in_hr {
1493: my ($root) = @_;
1494: my @hrs = $root->getElementsByTagName('hr');
1495: foreach my $hr (@hrs) {
1496: tie (my %new_properties, 'Tie::IxHash', ());
1497: my $align = $hr->getAttribute('align');
1498: if (defined $align) {
1499: $align = lc(trim($align));
1500: if ($align eq 'left') {
1501: $new_properties{'text-align'} = 'left';
1502: $new_properties{'margin-left'} = '0';
1503: } elsif ($align eq 'right') {
1504: $new_properties{'text-align'} = 'right';
1505: $new_properties{'margin-right'} = '0';
1506: }
1507: $hr->removeAttribute('align');
1508: }
1509: my $color = $hr->getAttribute('color');
1510: if (defined $color) {
1511: $color = trim($color);
1512: $color =~ s/^x\s*//;
1513: if ($color ne '') {
1514: $new_properties{'color'} = $color;
1515: $new_properties{'background-color'} = $color;
1516: }
1517: $hr->removeAttribute('color');
1518: }
1519: my $noshade = $hr->getAttribute('noshade');
1520: my $size = $hr->getAttribute('size');
1521: if (defined $noshade) {
1522: $new_properties{'border-width'} = '0';
1523: if (!defined $color) {
1524: $new_properties{'color'} = 'gray';
1525: $new_properties{'background-color'} = 'gray';
1526: }
1527: if (!defined $size) {
1528: $size = '2';
1529: }
1530: $hr->removeAttribute('noshade');
1531: }
1532: if (defined $size) {
1533: $size = trim($size);
1534: if ($size ne '') {
1535: $new_properties{'height'} = $size.'px';
1536: }
1537: if (defined $hr->getAttribute('size')) {
1538: $hr->removeAttribute('size');
1539: }
1540: }
1541: my $width = $hr->getAttribute('width');
1542: if (defined $width) {
1543: $width = trim($width);
1544: if ($width ne '') {
1545: if ($width !~ /\%$/) {
1546: $width .= 'px';
1547: }
1548: $new_properties{'width'} = $width;
1549: }
1550: $hr->removeAttribute('width');
1551: }
1552: if (scalar(keys %new_properties) > 0) {
1553: set_css_properties($hr, \%new_properties);
1554: }
1555: }
1556: }
1557:
1558: # Replaces deprecated attributes in img
1559: sub fix_deprecated_in_img {
1560: my ($root) = @_;
1561: my @imgs = $root->getElementsByTagName('img');
1562: foreach my $img (@imgs) {
1563: my $old_properties = get_css_properties($img);
1564: tie (my %new_properties, 'Tie::IxHash', ());
1565: my $align = $img->getAttribute('align');
1566: if (defined $align) {
1567: $align = lc(trim($align));
1568: if ($align eq 'middle' || $align eq 'top' || $align eq 'bottom') {
1569: $img->removeAttribute('align');
1570: if (!defined $old_properties->{'vertical-align'}) {
1571: $new_properties{'vertical-align'} = $align;
1572: }
1573: } elsif ($align eq 'left' || $align eq 'right') {
1574: $img->removeAttribute('align');
1575: if (!defined $old_properties->{'float'}) {
1576: $new_properties{'float'} = $align;
1577: }
1578: } elsif ($align eq 'center' || $align eq '') {
1579: $img->removeAttribute('align');
1580: }
1581: }
1582: my $border = $img->getAttribute('border');
1583: if (defined $border) {
1584: $border = lc(trim($border));
1585: if ($border =~ /^[0-9]+\s*(px)?$/) {
1586: $img->removeAttribute('border');
1587: if (!defined $old_properties->{'border'}) {
1588: if ($border !~ /px$/) {
1589: $border .= 'px';
1590: }
1591: $new_properties{'border'} = $border.' solid black';
1592: }
1593: }
1594: }
1595: my $hspace = $img->getAttribute('hspace');
1596: if (defined $hspace) {
1597: $hspace = lc(trim($hspace));
1598: if ($hspace =~ /^[0-9]+\s*(px)?$/) {
1599: $img->removeAttribute('hspace');
1600: if (!defined $old_properties->{'margin-left'} || !defined $old_properties->{'margin-right'}) {
1601: if ($hspace !~ /px$/) {
1602: $hspace .= 'px';
1603: }
1604: $new_properties{'margin-left'} = $hspace;
1605: $new_properties{'margin-right'} = $hspace;
1606: }
1607: }
1608: }
1609: if (scalar(keys %new_properties) > 0) {
1610: set_css_properties($img, \%new_properties);
1611: }
1612: }
1613: }
1614:
1615: # Replaces deprecated attributes in htmlbody (the style attribute could be used in a div for output)
1616: sub fix_deprecated_in_body {
1617: my ($root) = @_;
1618: my $doc = $root->ownerDocument;
1619: my @bodies = $root->getElementsByTagName('htmlbody');
1620: foreach my $body (@bodies) {
1621: my $old_properties = get_css_properties($body);
1622: tie (my %new_properties, 'Tie::IxHash', ());
1623: my $bgcolor = $body->getAttribute('bgcolor');
1624: if (defined $bgcolor) {
1625: $body->removeAttribute('bgcolor');
1626: if (!defined $old_properties->{'background-color'}) {
1627: $bgcolor = trim($bgcolor);
1628: $bgcolor =~ s/^x\s*//;
1629: if ($bgcolor ne '') {
1630: $new_properties{'background-color'} = $bgcolor;
1631: }
1632: }
1633: }
1634: my $color = $body->getAttribute('text');
1635: if (defined $color) {
1636: $body->removeAttribute('text');
1637: if (!defined $old_properties->{'color'}) {
1638: $color = trim($color);
1639: $color =~ s/^x\s*//;
1640: if ($color ne '') {
1641: $new_properties{'color'} = $color;
1642: }
1643: }
1644: }
1645: my $background = $body->getAttribute('background');
1646: if (defined $background && ($background =~ /\.jpe?g$|\.gif|\.png/i)) {
1647: $body->removeAttribute('background');
1648: if (!defined $old_properties->{'background-image'}) {
1649: $background = trim($background);
1650: if ($background ne '') {
1651: $new_properties{'background-image'} = 'url('.$background.')';
1652: }
1653: }
1654: }
1655: # NOTE: these attributes have never been standard and are better removed with no replacement
1656: foreach my $bad ('bottommargin', 'leftmargin', 'rightmargin', 'topmargin', 'marginheight', 'marginwidth') {
1657: if ($body->hasAttribute($bad)) {
1658: $body->removeAttribute($bad);
1659: }
1660: }
1661: # NOTE: link alink and vlink require a <style> block to be converted
1662: my $link = $body->getAttribute('link');
1663: my $alink = $body->getAttribute('alink');
1664: my $vlink = $body->getAttribute('vlink');
1665: if (defined $link || defined $alink || defined $vlink) {
1666: my $head;
1667: my @heads = $root->getElementsByTagName('htmlhead');
1668: if (scalar(@heads) > 0) {
1669: $head = $heads[0];
1670: } else {
1671: $head = $doc->createElement('htmlhead');
1672: $root->insertBefore($head, $root->firstChild);
1673: }
1674: my $style = $doc->createElement('style');
1675: $head->appendChild($style);
1676: my $css = "\n";
1677: if (defined $link) {
1678: $body->removeAttribute('link');
1679: $link = trim($link);
1680: $link =~ s/^x\s*//;
1681: $css .= ' a:link { color:'.$link.' }';
1682: $css .= "\n";
1683: }
1684: if (defined $alink) {
1685: $body->removeAttribute('alink');
1686: $alink = trim($alink);
1687: $alink =~ s/^x\s*//;
1688: $css .= ' a:active { color:'.$alink.' }';
1689: $css .= "\n";
1690: }
1691: if (defined $vlink) {
1692: $body->removeAttribute('vlink');
1693: $vlink = trim($vlink);
1694: $vlink =~ s/^x\s*//;
1695: $css .= ' a:visited { color:'.$vlink.' }';
1696: $css .= "\n";
1697: }
1698: $css .= ' ';
1699: $style->appendChild($doc->createTextNode($css));
1700: }
1701: if (scalar(keys %new_properties) > 0) {
1702: set_css_properties($body, \%new_properties);
1703: } elsif (!$body->hasAttributes) {
1704: $body->parentNode->removeChild($body);
1705: }
1706: }
1707: }
1708:
1709: # replaces <div align="center"> by <div style="text-align:center;">
1710: # also for p and h1..h6
1711: sub fix_align_attribute {
1712: my ($root) = @_;
1713: my @nodes = $root->getElementsByTagName('div');
1714: push(@nodes, $root->getElementsByTagName('p'));
1715: for (my $i=1; $i<=6; $i++) {
1716: push(@nodes, $root->getElementsByTagName('h'.$i));
1717: }
1718: foreach my $node (@nodes) {
1719: my $align = $node->getAttribute('align');
1720: if (defined $align) {
1721: $node->removeAttribute('align');
1722: $align = trim($align);
1723: if ($align ne '' && !defined get_css_property($node, 'text-align')) {
1724: set_css_property($node, 'text-align', lc($align));
1725: }
1726: }
1727: }
1728: }
1729:
1730: # replace center by a div or remove it if there is a table inside
1731: sub replace_center {
1732: my ($root, $all_block) = @_;
1733: my $doc = $root->ownerDocument;
1734: my @centers = $root->getElementsByTagName('center');
1735: foreach my $center (@centers) {
1736: if ($center->getChildrenByTagName('table')->size() > 0) { # note: getChildrenByTagName is not DOM (LibXML specific)
1737: replace_by_children($center);
1738: } else {
1739: if ((!defined $center->previousSibling ||
1740: ($center->previousSibling->nodeType == XML_TEXT_NODE && $center->previousSibling->nodeValue =~ /^\s*$/ && !defined $center->previousSibling->previousSibling)) &&
1741: (!defined $center->nextSibling ||
1742: ($center->nextSibling->nodeType == XML_TEXT_NODE && $center->nextSibling->nodeValue =~ /^\s*$/ && !defined $center->nextSibling->nextSibling)) &&
1743: string_in_array(\@accepting_style, $center->parentNode->nodeName)) {
1744: # use CSS on the parent block and replace center by its children
1745: set_css_property($center->parentNode, 'text-align', 'center');
1746: replace_by_children($center);
1747: } else {
1748: # use p or div ? check if there is a block inside
1749: my $found_block = 0;
1750: for (my $child=$center->firstChild; defined $child; $child=$child->nextSibling) {
1751: if ($child->nodeType == XML_ELEMENT_NODE && string_in_array($all_block, $child->nodeName)) {
1752: $found_block = 1;
1753: last;
1754: }
1755: }
1756: my $new_node;
1757: if ($found_block) {
1758: $new_node = $doc->createElement('div');
1759: $new_node->setAttribute('style', 'text-align: center; margin: 0 auto');
1760: } else {
1761: $new_node = $doc->createElement('p');
1762: $new_node->setAttribute('style', 'text-align: center');
1763: }
1764: my $next;
1765: for (my $child=$center->firstChild; defined $child; $child=$next) {
1766: $next = $child->nextSibling;
1767: $center->removeChild($child);
1768: $new_node->appendChild($child);
1769: }
1770: $center->parentNode->replaceChild($new_node, $center);
1771: }
1772: }
1773: }
1774: }
1775:
1776: # replaces <nobr> by <span style="white-space:nowrap">
1777: sub replace_nobr {
1778: my ($root) = @_;
1779: my @nobrs = $root->getElementsByTagName('nobr');
1780: foreach my $nobr (@nobrs) {
1781: if (!defined $nobr->previousSibling && !defined $nobr->nextSibling &&
1782: string_in_array(\@accepting_style, $nobr->parentNode->nodeName)) {
1783: # use CSS on the parent block
1784: set_css_property($nobr->parentNode, 'white-space', 'nowrap');
1785: replace_by_children($nobr);
1786: } else {
1787: $nobr->setNodeName('span');
1788: $nobr->setAttribute('style', 'white-space:nowrap');
1789: }
1790: }
1791: }
1792:
1793: # removes notsolved tags in the case <hintgroup showoncorrect="no"><notsolved>...</notsolved></hintgroup>
1794: # and in the case <notsolved><hintgroup showoncorrect="no">...</hintgroup></notsolved>
1795: sub remove_useless_notsolved {
1796: my ($root) = @_;
1797: my @hintgroups = $root->getElementsByTagName('hintgroup');
1798: foreach my $hintgroup (@hintgroups) {
1799: my $showoncorrect = get_non_empty_attribute($hintgroup, 'showoncorrect');
1800: if (!defined $showoncorrect || $showoncorrect eq 'no') {
1801: my @notsolveds = $hintgroup->getElementsByTagName('notsolved');
1802: foreach my $notsolved (@notsolveds) {
1803: replace_by_children($notsolved);
1804: }
1805: }
1806: my $parent = $hintgroup->parentNode;
1807: if ($parent->nodeName eq 'notsolved' && scalar(@{$parent->nonBlankChildNodes()}) == 1) {
1808: replace_by_children($parent);
1809: }
1810: }
1811: }
1812:
1813: # adds a paragraph inside if needed and calls fix_paragraph for all paragraphs (including new ones)
1814: sub fix_paragraphs_inside {
1815: my ($node, $all_block) = @_;
1816: # blocks in which paragrahs will be added:
1817: my @blocks_with_p = ('loncapa','library','problem','part','problemtype','window','block','while','postanswerdate','preduedate','solved','notsolved','languageblock','instructorcomment','togglebox','standalone','body','form');
1818: my @fix_p_if_br_or_p = (@responses,'foil','item','text','label','hintgroup','hintpart','hint','web','windowlink','div','li','dd','td','th','blockquote');
1819: if ((string_in_array(\@blocks_with_p, $node->nodeName) && paragraph_needed($node)) ||
1820: (string_in_array(\@fix_p_if_br_or_p, $node->nodeName) && paragraph_inside($node))) {
1821: # if non-empty, add paragraphs where needed between all br and remove br
1822: # (it would be easier to just put everything in a p and fix it afterwards, but there are performance issues
1823: # when a paragraph has many blocks directly inside)
1824: my $doc = $node->ownerDocument;
1825: my $p = undef;
1826: my @new_children = ();
1827: my $next;
1828: for (my $child=$node->firstChild; defined $child; $child=$next) {
1829: $next = $child->nextSibling;
1830: $node->removeChild($child);
1831: if ($child->nodeType == XML_ELEMENT_NODE && $child->nodeName eq 'br') {
1832: if (defined $p) {
1833: push(@new_children, $p);
1834: } else {
1835: push(@new_children, $doc->createElement('p'));
1836: }
1837: $p = undef;
1838: } elsif ($child->nodeType == XML_ELEMENT_NODE && string_in_array(\@inline_like_block, $child->nodeName)) {
1839: # inline_like_block: use the paragraph if there is one, otherwise do not create one
1840: if (defined $p) {
1841: $p->appendChild($child);
1842: } else {
1843: push(@new_children, $child);
1844: }
1845: } elsif ($child->nodeType == XML_ELEMENT_NODE && string_in_array($all_block, $child->nodeName)) {
1846: # these children are blocks and should not be in a paragraph
1847: if (defined $p) {
1848: push(@new_children, $p);
1849: $p = undef;
1850: }
1851: push(@new_children, $child);
1852: } elsif ($child->nodeType == XML_TEXT_NODE && $child->nodeValue =~ /^[ \t\f\n\r]*$/) {
1853: # blank text: add to paragraph if there is one and there is a next node, otherwise keep out of the paragraph
1854: if (defined $p) {
1855: if (defined $next) {
1856: $p->appendChild($child);
1857: } else {
1858: push(@new_children, $p);
1859: $p = undef;
1860: push(@new_children, $child);
1861: }
1862: } else {
1863: push(@new_children, $child);
1864: }
1865: } elsif ($child->nodeType == XML_TEXT_NODE ||
1866: $child->nodeType == XML_ELEMENT_NODE || $child->nodeType == XML_CDATA_SECTION_NODE ||
1867: $child->nodeType == XML_ENTITY_NODE || $child->nodeType == XML_ENTITY_REF_NODE) {
1868: # these children require a paragraph
1869: if (!defined $p) {
1870: $p = $doc->createElement('p');
1871: }
1872: $p->appendChild($child);
1873: } else {
1874: # these children do not require a paragraph (XML comments, PI)
1875: # -> do not move them in a new paragraph
1876: if (defined $p) {
1877: push(@new_children, $p);
1878: $p = undef;
1879: }
1880: push(@new_children, $child);
1881: }
1882: }
1883: if (defined $p) {
1884: push(@new_children, $p);
1885: }
1886: foreach my $child (@new_children) {
1887: $node->appendChild($child);
1888: }
1889: }
1890: # now fix the paragraphs everywhere, so that all inline nodes are inside a paragraph, and block nodes are outside
1891: my $next;
1892: for (my $child=$node->firstChild; defined $child; $child=$next) {
1893: $next = $child->nextSibling;
1894: if ($child->nodeType == XML_ELEMENT_NODE && defined $child->firstChild) {
1895: if ($child->nodeName eq 'p') {
1896: fix_paragraph($child, $all_block);
1897: } else {
1898: fix_paragraphs_inside($child, $all_block);
1899: }
1900: }
1901: }
1902: }
1903:
1904: # returns 1 if a paragraph is needed inside this node (assuming the parent can have paragraphs)
1905: sub paragraph_needed {
1906: my ($node) = @_;
1907: for (my $child=$node->firstChild; defined $child; $child=$child->nextSibling) {
1908: if (($child->nodeType == XML_TEXT_NODE && $child->nodeValue !~ /^\s*$/) ||
1909: ($child->nodeType == XML_ELEMENT_NODE && !string_in_array(\@inline_like_block, $child->nodeName)) ||
1910: $child->nodeType == XML_CDATA_SECTION_NODE ||
1911: $child->nodeType == XML_ENTITY_NODE || $child->nodeType == XML_ENTITY_REF_NODE) {
1912: return(1);
1913: }
1914: }
1915: return(0);
1916: }
1917:
1918: # returns 1 if there is a paragraph or br in a child of this node, or inside an inline child
1919: sub paragraph_inside {
1920: my ($node) = @_;
1921: # inline elements that can be split in half if there is a paragraph inside (currently all HTML):
1922: # (also used in first_block below)
1923: my @splitable_inline = ('span', 'a', 'strong', 'em' , 'b', 'i', 'sup', 'sub', 'code', 'kbd', 'samp', 'tt', 'ins', 'del', 'var', 'small', 'big', 'font', 'u');
1924: for (my $child=$node->firstChild; defined $child; $child=$child->nextSibling) {
1925: if ($child->nodeType == XML_ELEMENT_NODE) {
1926: my $name = $child->nodeName;
1927: if ($name eq 'p' || $name eq 'br') {
1928: return(1);
1929: } elsif (string_in_array(\@splitable_inline, $name)) {
1930: if (paragraph_inside($child)) {
1931: return(1);
1932: }
1933: }
1934: }
1935: }
1936: return(0);
1937: }
1938:
1939: # fixes paragraphs inside paragraphs (without a block in-between)
1940: sub fix_paragraph {
1941: my ($p, $all_block) = @_;
1942: my $loop_right = 1; # this loops is to avoid out of memory errors with recurse, see below
1943: while ($loop_right) {
1944: $loop_right = 0;
1945: my $block = find_first_block($p, $all_block);
1946: if (defined $block) {
1947: my $trees = clone_ancestor_around_node($p, $block);
1948: my $doc = $p->ownerDocument;
1949: my $replacement = $doc->createDocumentFragment();
1950: my $left = $trees->{'left'};
1951: my $middle = $trees->{'middle'};
1952: my $right = $trees->{'right'};
1953: my $left_needs_p = 0; # 1 if it needs a paragraph (used to replace br later)
1954:
1955: if (defined $left) {
1956: # fix paragraphs inside, in case one of the descendants can have paragraphs inside (like numericalresponse/hintgroup):
1957: for (my $child=$left->firstChild; defined $child; $child=$child->nextSibling) {
1958: if ($child->nodeType == XML_ELEMENT_NODE) {
1959: fix_paragraphs_inside($child, $all_block);
1960: }
1961: }
1962: if (!paragraph_needed($left)) {
1963: # this was just blank text, comments or inline responses, it should not create a new paragraph
1964: my $next;
1965: for (my $child=$left->firstChild; defined $child; $child=$next) {
1966: $next = $child->nextSibling;
1967: $left->removeChild($child);
1968: $replacement->appendChild($child);
1969: }
1970: } else {
1971: $left_needs_p = 1;
1972: $replacement->appendChild($left);
1973: }
1974: }
1975:
1976: my $n = $middle->firstChild;
1977: while (defined $n) {
1978: if ($n->nodeType == XML_ELEMENT_NODE && (string_in_array($all_block, $n->nodeName) || $n->nodeName eq 'br')) {
1979: if ($n->nodeName eq 'p') {
1980: my $parent = $n->parentNode;
1981: # first apply recursion
1982: fix_paragraph($n, $all_block);
1983: # now the p might have been replaced by several nodes, which should replace the initial p
1984: my $next_block;
1985: for (my $block=$parent->firstChild; defined $block; $block=$next_block) {
1986: $next_block = $block->nextSibling;
1987: if ($block->nodeName eq 'p') {
1988: $parent->removeChild($block);
1989: # for each parent before $middle, clone in-between the p and its children (to preserve the styles)
1990: if (defined $block->firstChild) {
1991: for (my $p=$parent; $p!=$middle; $p=$p->parentNode) {
1992: my $newp = $p->cloneNode(0);
1993: my $next;
1994: for (my $child=$block->firstChild; defined $child; $child=$next) {
1995: $next = $child->nextSibling;
1996: $block->removeChild($child);
1997: $newp->appendChild($child);
1998: }
1999: $block->appendChild($newp);
2000: }
2001: }
2002: }
2003: $replacement->appendChild($block);
2004: }
2005: } else {
2006: # replace the whole p by this block, forgetting about intermediate inline elements
2007: $n->parentNode->removeChild($n);
2008: if ($n->nodeName eq 'br') {
2009: # replace a br by a paragraph if there was nothing before in the paragraph,
2010: # otherwise remove it because it already broke the paragraph in half
2011: if (!defined $left || !$left_needs_p) {
2012: $replacement->appendChild($middle);
2013: }
2014: } else {
2015: fix_paragraphs_inside($n, $all_block);
2016: $replacement->appendChild($n);
2017: }
2018: }
2019: last;
2020: }
2021: $n = $n->firstChild;
2022: if (defined $n && defined $n->nextSibling) {
2023: die "Error in post_xml.fix_paragraph: block not found";
2024: }
2025: }
2026:
2027: if (defined $right) {
2028: if ($block->nodeName eq 'p') {
2029: # remove attributes on the right paragraph
2030: my @attributelist = $right->attributes();
2031: foreach my $att (@attributelist) {
2032: $right->removeAttribute($att->nodeName);
2033: }
2034: }
2035: if ($right->firstChild->nodeType == XML_TEXT_NODE && $right->firstChild->nodeValue =~ /^[ \t\f\n\r]*$/) {
2036: # remove the first text node with whitespace only from the p, it should not trigger the creation of a p
2037: # (but take nbsp into account, so we should not use \s here)
2038: my $first = $right->firstChild;
2039: $right->removeChild($first);
2040: $replacement->appendChild($first);
2041: }
2042: if (defined $right->firstChild) {
2043: if (paragraph_needed($right)) {
2044: $replacement->appendChild($right);
2045: #fix_paragraph($right, $all_block); This is taking way too much memory for blocks with many children
2046: # -> loop instead of recurse
2047: $loop_right = 1;
2048: } else {
2049: # this was just blank text, comments or inline responses, it should not create a new paragraph
2050: my $next;
2051: for (my $child=$right->firstChild; defined $child; $child=$next) {
2052: $next = $child->nextSibling;
2053: $right->removeChild($child);
2054: $replacement->appendChild($child);
2055: # fix paragraphs inside, in case one of the descendants can have paragraphs inside (like numericalresponse/hintgroup):
2056: if ($child->nodeType == XML_ELEMENT_NODE) {
2057: fix_paragraphs_inside($child, $all_block);
2058: }
2059: }
2060: }
2061: }
2062: }
2063:
2064: $p->parentNode->replaceChild($replacement, $p);
2065:
2066: if ($loop_right) {
2067: $p = $right;
2068: }
2069:
2070: } else {
2071: # fix paragraphs inside, in case one of the descendants can have paragraphs inside (like numericalresponse/hintgroup):
2072: my $next;
2073: for (my $child=$p->firstChild; defined $child; $child=$next) {
2074: $next = $child->nextSibling;
2075: if ($child->nodeType == XML_ELEMENT_NODE) {
2076: fix_paragraphs_inside($child, $all_block);
2077: }
2078: }
2079: }
2080: }
2081: }
2082:
2083: sub find_first_block {
2084: my ($node, $all_block) = @_;
2085: # inline elements that can be split in half if there is a paragraph inside (currently all HTML):
2086: my @splitable_inline = ('span', 'a', 'strong', 'em' , 'b', 'i', 'sup', 'sub', 'code', 'kbd', 'samp', 'tt', 'ins', 'del', 'var', 'small', 'big', 'font', 'u');
2087: for (my $child=$node->firstChild; defined $child; $child=$child->nextSibling) {
2088: if ($child->nodeType == XML_ELEMENT_NODE) {
2089: if (string_in_array($all_block, $child->nodeName) || $child->nodeName eq 'br') {
2090: return($child);
2091: }
2092: if (string_in_array(\@splitable_inline, $child->nodeName)) {
2093: my $block = find_first_block($child, $all_block);
2094: if (defined $block) {
2095: return($block);
2096: }
2097: }
2098: }
2099: }
2100: return(undef);
2101: }
2102:
2103: # Creates clones of the ancestor containing the descendants before the node, at the node, and after the node.
2104: # returns a hash with: left, middle, right (left and right can be undef)
2105: sub clone_ancestor_around_node {
2106: my ($ancestor, $node) = @_;
2107: my $middle_node;
2108: my ($left, $middle, $right);
2109: for (my $child=$ancestor->firstChild; defined $child; $child=$child->nextSibling) {
2110: if ($child == $node || is_ancestor_of($child, $node)) {
2111: $middle_node = $child;
2112: last;
2113: }
2114: }
2115: if (!defined $middle_node) {
2116: die "error in split_ancestor_around_node: middle not found";
2117: }
2118: if (defined $middle_node->previousSibling) {
2119: $left = $ancestor->cloneNode(0);
2120: for (my $child=$ancestor->firstChild; $child != $middle_node; $child=$child->nextSibling) {
2121: $left->appendChild($child->cloneNode(1));
2122: }
2123: }
2124: $middle = $ancestor->cloneNode(0);
2125: if ($middle_node == $node) {
2126: $middle->appendChild($middle_node->cloneNode(1));
2127: } else {
2128: my $subres = clone_ancestor_around_node($middle_node, $node);
2129: my $subleft = $subres->{'left'};
2130: if (defined $subleft) {
2131: if (!defined $left) {
2132: $left = $ancestor->cloneNode(0);
2133: }
2134: $left->appendChild($subleft);
2135: }
2136: $middle->appendChild($subres->{'middle'});
2137: my $subright = $subres->{'right'};
2138: if (defined $subright) {
2139: $right = $ancestor->cloneNode(0);
2140: $right->appendChild($subright);
2141: }
2142: }
2143: if (defined $middle_node->nextSibling) {
2144: if (!defined $right) {
2145: $right = $ancestor->cloneNode(0);
2146: }
2147: for (my $child=$middle_node->nextSibling; defined $child; $child=$child->nextSibling) {
2148: $right->appendChild($child->cloneNode(1));
2149: }
2150: }
2151: my %result = ();
2152: $result{'left'} = $left;
2153: $result{'middle'} = $middle;
2154: $result{'right'} = $right;
2155: return(\%result);
2156: }
2157:
2158: sub is_ancestor_of {
2159: my ($n1, $n2) = @_;
2160: my $n = $n2->parentNode;
2161: while (defined $n) {
2162: if ($n == $n1) {
2163: return(1);
2164: }
2165: $n = $n->parentNode;
2166: }
2167: return(0);
2168: }
2169:
2170: # removes empty style elements and replaces the ones with only whitespaces inside by their content
2171: # also remove hints that have become empty after empty style removal.
2172: sub remove_empty_style {
2173: my ($root) = @_;
2174: # actually, preserve some elements like ins when they have whitespace, only remove if they are empty
2175: my @remove_if_empty = ('span', 'strong', 'em' , 'b', 'i', 'sup', 'sub', 'code', 'kbd', 'samp', 'tt', 'ins', 'del', 'var', 'small', 'big', 'font', 'u', 'hint');
2176: my @remove_if_blank = ('span', 'strong', 'em' , 'b', 'i', 'sup', 'sub', 'tt', 'var', 'small', 'big', 'font', 'u', 'hint');
2177: foreach my $name (@remove_if_empty) {
2178: my @nodes = $root->getElementsByTagName($name);
2179: while (scalar(@nodes) > 0) {
2180: my $node = pop(@nodes);
2181: if (!defined $node->firstChild) {
2182: my $parent = $node->parentNode;
2183: if (defined $node->previousSibling && $node->previousSibling->nodeType == XML_TEXT_NODE &&
2184: $node->previousSibling->nodeValue =~ /\$\S*$/) {
2185: # case $a<sup></sup>x
2186: my $value = $node->previousSibling->nodeValue;
2187: $value =~ s/\$(\S*)$/\$\{$1\}/;
2188: $node->previousSibling->setData($value);
2189: }
2190: $parent->removeChild($node);
2191: $parent->normalize();
2192: # now that we removed the node, check if the parent has become an empty style, and so on
2193: while (defined $parent && string_in_array(\@remove_if_empty, $parent->nodeName) && !defined $parent->firstChild) {
2194: my $grandparent = $parent->parentNode;
2195: $grandparent->removeChild($parent);
2196: remove_reference_from_array(\@nodes, $parent);
2197: $parent = $grandparent;
2198: }
2199: }
2200: }
2201: }
2202: foreach my $name (@remove_if_blank) {
2203: my @nodes = $root->getElementsByTagName($name);
2204: while (scalar(@nodes) > 0) {
2205: my $node = pop(@nodes);
2206: if (defined $node->firstChild && !defined $node->firstChild->nextSibling && $node->firstChild->nodeType == XML_TEXT_NODE) {
2207: # NOTE: careful, with UTF-8, \s matches non-breaking spaces and we want to preserve these
2208: if ($node->firstChild->nodeValue =~ /^[\t\n\f\r ]*$/) {
2209: my $parent = $node->parentNode;
2210: replace_by_children($node);
2211: $parent->normalize();
2212: # now that we removed the node, check if the parent has become a style with only whitespace, and so on
2213: while (defined $parent && string_in_array(\@remove_if_blank, $parent->nodeName) &&
2214: (!defined $parent->firstChild ||
2215: (!defined $parent->firstChild->nextSibling && $parent->firstChild->nodeType == XML_TEXT_NODE &&
2216: $parent->firstChild->nodeValue =~ /^^[\t\n\f\r ]*$/))) {
2217: my $grandparent = $parent->parentNode;
2218: replace_by_children($parent);
2219: remove_reference_from_array(\@nodes, $parent);
2220: $parent = $grandparent;
2221: }
2222: }
2223: }
2224: }
2225: }
2226: }
2227:
2228: # remove whitespace inside LON-CAPA elements that have an empty content-model (HTML ones are handled by html_to_xml)
2229: sub fix_empty_lc_elements {
2230: my ($node) = @_;
2231: my @lcempty = ('arc','axis','backgroundplot','drawoptionlist','drawvectorsum','fill','functionplotrule','functionplotvectorrule','functionplotvectorsumrule','hiddenline','hiddensubmission','key','line','location','organicstructure','parameter','plotobject','plotvector','responseparam','spline','textline');
2232: if (string_in_array(\@lcempty, $node->nodeName)) {
2233: if (defined $node->firstChild && !defined $node->firstChild->nextSibling &&
2234: $node->firstChild->nodeType == XML_TEXT_NODE && $node->firstChild->nodeValue =~ /^\s*$/) {
2235: $node->removeChild($node->firstChild);
2236: }
2237: if (defined $node->firstChild) {
2238: if ($warnings) {
2239: print "Warning: a ".$node->nodeName." has something inside\n";
2240: }
2241: }
2242: return;
2243: }
2244: for (my $child=$node->firstChild; defined $child; $child=$child->nextSibling) {
2245: if ($child->nodeType == XML_ELEMENT_NODE) {
2246: fix_empty_lc_elements($child);
2247: }
2248: }
2249: }
2250:
2251: # turn some attribute values into lowercase when they should be
2252: sub lowercase_attribute_values {
2253: my ($root) = @_;
2254: my @with_yesno = (['radiobuttonresponse', ['randomize']],
2255: ['optionresponse', ['randomize']],
2256: ['matchresponse', ['randomize']],
2257: ['itemgroup', ['randomize']],
2258: ['rankresponse', ['randomize']],
2259: ['functionplotresponse', ['xaxisvisible', 'yaxisvisible', 'gridvisible']],
2260: ['backgroundplot', ['fixed']],
2261: ['drawvectorsum', ['showvalue']],
2262: ['textline', ['readonly']],
2263: ['hint', ['showoncorrect']],
2264: ['body', ['dir']],
2265: ['img', ['encrypturl']],
2266: ['form', ['method']],
2267: ['input', ['type']]
2268: );
2269: foreach my $el_attributes (@with_yesno) {
2270: my $el_name = $el_attributes->[0];
2271: my @elements = $root->getElementsByTagName($el_name);
2272: foreach my $element (@elements) {
2273: my $att_list = $el_attributes->[1];
2274: foreach my $att_name (@$att_list) {
2275: my $att_value = $element->getAttribute($att_name);
2276: if (!defined $att_value) {
2277: next;
2278: }
2279: if ($att_value eq 'yes' || $att_value eq 'no') {
2280: next;
2281: }
2282: if ($att_value =~ /\s*yes\s*/i) {
2283: $element->setAttribute($att_name, 'yes');
2284: } elsif ($att_value =~ /\s*no\s*/i) {
2285: $element->setAttribute($att_name, 'no');
2286: }
2287: }
2288: }
2289: }
2290: }
2291:
2292: # fixes spelling mistakes for numericalresponse/@unit
2293: sub replace_numericalresponse_unit_attribute {
2294: my ($root) = @_;
2295: my @numericalresponses = $root->getElementsByTagName('numericalresponse');
2296: foreach my $numericalresponse (@numericalresponses) {
2297: if (defined $numericalresponse->getAttribute('units') && !defined $numericalresponse->getAttribute('unit')) {
2298: $numericalresponse->setAttribute('unit', $numericalresponse->getAttribute('units'));
2299: $numericalresponse->removeAttribute('units');
2300: }
2301: }
2302:
2303: }
2304:
2305: # Replaces &format and &prettyprint by <num> whenever possible.
2306: # Also replaces &chemparse by <chem>.
2307: # If the function call is enclosed in <display>, the <display> element is removed.
2308: sub replace_functions_by_elements {
2309: my ($root) = @_;
2310: my $doc = $root->ownerDocument;
2311: my @preserve = ('script','answer','parse','m','tm','dtm','numericalhintscript'); # display is handled later
2312: my @all = $root->getElementsByTagName('*');
2313: foreach my $element (@all) {
2314: if (string_in_array(\@preserve, $element->nodeName)) {
2315: next;
2316: }
2317: my $changed = 0;
2318: my $next;
2319: for (my $child=$element->firstChild; defined $child; $child=$next) {
2320: $next = $child->nextSibling;
2321: if ($child->nodeType == XML_TEXT_NODE) {
2322: my $value = $child->nodeValue;
2323: if ($value =~ /^(.*)&(?:format|prettyprint)\((\$\{?[a-zA-Z0-9]*\}?(?:\[[^\]]*\])?|[0-9.]+)\s?,\s?(["'][,.\$]?[0-9][eEfFgGsS]["']|\$[a-zA-Z0-9]*)\)(.*)$/s) {
2324: # NOTE: we don't check for &prettyprint's 3rd argument (target), but it has not been seen outside of script elements.
2325: # NOTE: the format options ',' and '$' are not supported by &format in current LON-CAPA since rev 1.81 of default_homework.lcpm,
2326: # but are supported by &prettyprint;
2327: # if we use (like current LON-CAPA) &prettyprint for <num> implementation, it will change a few resulting documents
2328: # (by making them display something they were probably intended to display, but which did not).
2329: # Usage of <num> with &prettyprint instead of &format might also change the display when there is an exponent.
2330: my $before = $1;
2331: my $number = $2;
2332: my $format = $3;
2333: my $after = $4;
2334: $format =~ s/^['"]|['"]$//g;
2335: # do not change this if the parent is <display> and there are other things before or after &format
2336: if ($element->nodeName eq 'display' && (defined $child->previousSibling || defined $next ||
2337: $before !~ /^\s*$/ || $after !~ /^\s*$/)) {
2338: last;
2339: }
2340: my $replacement = $doc->createDocumentFragment();
2341: my $num = $doc->createElement('num');
2342: $num->setAttribute('format', $format);
2343: $num->appendChild($doc->createTextNode($number));
2344: if (length($before) > 0) {
2345: $replacement->appendChild($doc->createTextNode($before));
2346: }
2347: $replacement->appendChild($num);
2348: if (length($after) > 0) {
2349: $replacement->appendChild($doc->createTextNode($after));
2350: }
2351: $element->replaceChild($replacement, $child);
2352: $changed = 1;
2353: $next = $element->firstChild; # start over, there might be another &format in the same text node
2354: } elsif ($value =~ /^(.*)&chemparse\(([^'"()]*|'[^']*'|"[^"]*")\)(.*)$/s) {
2355: my $before = $1;
2356: my $reaction = $2;
2357: my $after = $3;
2358: $reaction =~ s/^'(.*)'$/$1/;
2359: $reaction =~ s/^"(.*)"$/$1/;
2360: if ($element->nodeName eq 'display' && (defined $child->previousSibling || defined $next ||
2361: $before !~ /^\s*$/ || $after !~ /^\s*$/)) {
2362: last;
2363: }
2364: my $replacement = $doc->createDocumentFragment();
2365: my $chem = $doc->createElement('chem');
2366: $chem->appendChild($doc->createTextNode($reaction));
2367: if (length($before) > 0) {
2368: $replacement->appendChild($doc->createTextNode($before));
2369: }
2370: $replacement->appendChild($chem);
2371: if (length($after) > 0) {
2372: $replacement->appendChild($doc->createTextNode($after));
2373: }
2374: $element->replaceChild($replacement, $child);
2375: $changed = 1;
2376: $next = $element->firstChild;
2377: }
2378: }
2379: }
2380: if ($changed && $element->nodeName eq 'display') {
2381: my $first = $element->firstChild;
2382: if ($first->nodeType == XML_ELEMENT_NODE && string_in_array(['num','chem'], $first->nodeName) &&
2383: !defined $first->nextSibling) {
2384: # remove useless display element
2385: replace_by_children($element);
2386: }
2387: }
2388: }
2389: }
2390:
2391: # pretty-print using im-memory DOM tree
2392: sub pretty {
2393: my ($node, $all_block, $indent_level) = @_;
2394: my $doc = $node->ownerDocument;
2395: $indent_level ||= 0;
2396: my $type = $node->nodeType;
2397: if ($type == XML_ELEMENT_NODE) {
2398: my $name = $node->nodeName;
2399: if (string_in_array(\@preserve_elements, $name)) {
2400: # remove newlines at the beginning and the end of preserve elements
2401: if (defined $node->firstChild && ($node->firstChild->nodeType == XML_TEXT_NODE ||
2402: $node->firstChild->nodeType == XML_CDATA_SECTION_NODE)) {
2403: my $text = $node->firstChild->nodeValue;
2404: $text =~ s/^\n+//;
2405: if ($text eq '') {
2406: $node->removeChild($node->firstChild);
2407: } else {
2408: $node->firstChild->setData($text);
2409: }
2410: }
2411: if (defined $node->lastChild && ($node->lastChild->nodeType == XML_TEXT_NODE ||
2412: $node->lastChild->nodeType == XML_CDATA_SECTION_NODE)) {
2413: my $text = $node->lastChild->nodeValue;
2414: $text =~ s/\n+$//;
2415: if ($text eq '') {
2416: $node->removeChild($node->lastChild);
2417: } else {
2418: $node->lastChild->setData($text);
2419: }
2420: }
2421: } elsif (string_in_array($all_block, $name) || string_in_array(\@inline_like_block, $name)) {
2422: # make sure there is a newline at the beginning and at the end if there is anything inside
2423: if (defined $node->firstChild && !string_in_array(\@no_newline_inside, $name)) {
2424: my $first = $node->firstChild;
2425: if ($first->nodeType == XML_TEXT_NODE) {
2426: my $text = $first->nodeValue;
2427: if ($text !~ /^ *\n/) {
2428: $first->setData("\n" . $text);
2429: }
2430: } else {
2431: $node->insertBefore($doc->createTextNode("\n"), $first);
2432: }
2433: my $last = $node->lastChild;
2434: if ($last->nodeType == XML_TEXT_NODE) {
2435: my $text = $last->nodeValue;
2436: if ($text !~ /\n *$/) {
2437: $last->setData($text . "\n");
2438: }
2439: } else {
2440: $node->appendChild($doc->createTextNode("\n"));
2441: }
2442: }
2443:
2444: # indent and make sure there is a newline before and after a block element
2445: my $newline_indent = "\n".(' ' x (2*($indent_level + 1)));
2446: my $newline_indent_last = "\n".(' ' x (2*$indent_level));
2447: my $next;
2448: for (my $child=$node->firstChild; defined $child; $child=$next) {
2449: $next = $child->nextSibling;
2450: if ($child->nodeType == XML_ELEMENT_NODE) {
2451: if (string_in_array($all_block, $child->nodeName) || string_in_array(\@inline_like_block, $child->nodeName)) {
2452: # make sure there is a newline before and after a block element
2453: if (defined $child->previousSibling && $child->previousSibling->nodeType == XML_TEXT_NODE) {
2454: my $prev = $child->previousSibling;
2455: my $text = $prev->nodeValue;
2456: if ($text !~ /\n *$/) {
2457: $prev->setData($text . $newline_indent);
2458: }
2459: } else {
2460: $node->insertBefore($doc->createTextNode($newline_indent), $child);
2461: }
2462: if (defined $next && $next->nodeType == XML_TEXT_NODE) {
2463: my $text = $next->nodeValue;
2464: if ($text !~ /^ *\n/) {
2465: $next->setData($newline_indent . $text);
2466: }
2467: } else {
2468: $node->insertAfter($doc->createTextNode($newline_indent), $child);
2469: }
2470: }
2471: pretty($child, $all_block, $indent_level+1);
2472: } elsif ($child->nodeType == XML_TEXT_NODE) {
2473: my $text = $child->nodeValue;
2474: # collapse newlines
2475: $text =~ s/\n([\t ]*\n)+/\n/g;
2476: # indent and remove spaces and tabs before newlines
2477: if (defined $next) {
2478: $text =~ s/[\t ]*\n[\t ]*/$newline_indent/ge;
2479: } else {
2480: $text =~ s/[\t ]*\n[\t ]*/$newline_indent/ge;
2481: $text =~ s/[\t ]*\n[\t ]*$/$newline_indent_last/e;
2482: }
2483: $child->setData($text);
2484: }
2485: }
2486:
2487: # removes whitespace at the beginning and end of p td, th and li (except for nbsp at the beginning)
2488: my @to_trim = ('p','td','th','li');
2489: if (string_in_array(\@to_trim, $name) && defined $node->firstChild && $node->firstChild->nodeType == XML_TEXT_NODE) {
2490: my $text = $node->firstChild->nodeValue;
2491: $text =~ s/^[ \t\f\n\r]*//;
2492: if ($text eq '') {
2493: $node->removeChild($node->firstChild);
2494: } else {
2495: $node->firstChild->setData($text);
2496: }
2497: }
2498: if (string_in_array(\@to_trim, $name) && defined $node->lastChild && $node->lastChild->nodeType == XML_TEXT_NODE) {
2499: my $text = $node->lastChild->nodeValue;
2500: $text =~ s/\s*$//;
2501: if ($text eq '') {
2502: $node->removeChild($node->lastChild);
2503: } else {
2504: $node->lastChild->setData($text);
2505: }
2506: }
2507: }
2508: }
2509: }
2510:
2511: sub replace_tm_dtm {
2512: my ($root) = @_;
2513: my $doc = $root->ownerDocument;
2514: my @elements = $root->getElementsByTagName('tm');
2515: push(@elements, $root->getElementsByTagName('dtm'));
2516: foreach my $element (@elements) {
2517: my $first = $element->firstChild;
2518: if (defined $first && $first->nodeType == XML_TEXT_NODE) {
2519: my $text = $first->nodeValue;
2520: if ($element->nodeName eq 'tm') {
2521: $first->setData('$'.$text.'$');
2522: } else {
2523: $first->setData('$$'.$text.'$$');
2524: }
2525: }
2526: $element->setNodeName('m');
2527: }
2528: }
2529:
2530:
2531: ######## utilities ########
2532:
2533: ##
2534: # Trims a string (really, this should be built-in in Perl, this is ridiculous, ugly and slow)
2535: # @param {string} s - the string to trim
2536: # @returns the trimmed string
2537: ##
2538: sub trim {
2539: my ($s) = @_;
2540: $s =~ s/^\s+//;
2541: $s =~ s/\s+$//;
2542: return($s);
2543: }
2544:
2545: ##
2546: # Tests if a string is in an array (using eq) (to avoid Smartmatch warnings with $value ~~ @array)
2547: # @param {Array<string>} array - reference to the array of strings
2548: # @param {string} value - the string to look for
2549: # @returns 1 if found, 0 otherwise
2550: ##
2551: sub string_in_array {
2552: my ($array, $value) = @_;
2553: # NOTE: would it be faster to use "any { $value eq $_ } @{$array}" from List::Util ?
2554: foreach my $v (@{$array}) {
2555: if ($v eq $value) {
2556: return 1;
2557: }
2558: }
2559: return 0;
2560: }
2561:
2562: ##
2563: # Tests if an object is in an array (using ==)
2564: # @param {Array<Object>} array - reference to the array of references
2565: # @param {Object} ref - the reference to look for
2566: # @returns 1 if found, 0 otherwise
2567: ##
2568: sub reference_in_array {
2569: my ($array, $ref) = @_;
2570: foreach my $v (@{$array}) {
2571: if ($v == $ref) {
2572: return 1;
2573: }
2574: }
2575: return 0;
2576: }
2577:
2578: ##
2579: # returns the index of a string in an array
2580: # @param {Array<Object>} array - reference to the array of strings
2581: # @param {string} s - the string to look for (using eq)
2582: # @returns the index if found, -1 otherwise
2583: ##
2584: sub index_of_string {
2585: my ($array, $s) = @_;
2586: for (my $i=0; $i<scalar(@{$array}); $i++) {
2587: if ($array->[$i] eq $s) {
2588: return $i;
2589: }
2590: }
2591: return -1;
2592: }
2593:
2594: ##
2595: # returns the index of a reference in an array
2596: # @param {Array<Object>} array - reference to the array of references
2597: # @param {Object} ref - the reference to look for
2598: # @returns the index if found, -1 otherwise
2599: ##
2600: sub index_of_reference {
2601: my ($array, $ref) = @_;
2602: for (my $i=0; $i<scalar(@{$array}); $i++) {
2603: if ($array->[$i] == $ref) {
2604: return $i;
2605: }
2606: }
2607: return -1;
2608: }
2609:
2610: ##
2611: # if found, removes a string from an array, otherwise do nothing
2612: # @param {Array<string>} array - reference to the array of string
2613: # @param {string} s - the string to look for (using eq)
2614: ##
2615: sub remove_string_from_array {
2616: my ($array, $s) = @_;
2617: my $index = index_of_string($array, $s);
2618: if ($index != -1) {
2619: splice(@$array, $index, 1);
2620: }
2621: }
2622:
2623: ##
2624: # if found, removes a reference from an array, otherwise do nothing
2625: # @param {Array<Object>} array - reference to the array of references
2626: # @param {Object} ref - the reference to look for
2627: ##
2628: sub remove_reference_from_array {
2629: my ($array, $ref) = @_;
2630: my $index = index_of_reference($array, $ref);
2631: if ($index != -1) {
2632: splice(@$array, $index, 1);
2633: }
2634: }
2635:
2636: ##
2637: # replaces a node by its children
2638: # @param {Node} node - the DOM node
2639: ##
2640: sub replace_by_children {
2641: my ($node) = @_;
2642: my $parent = $node->parentNode;
2643: my $next;
2644: my $previous;
2645: for (my $child=$node->firstChild; defined $child; $child=$next) {
2646: $next = $child->nextSibling;
2647: if ((!defined $previous || !defined $next) &&
2648: $child->nodeType == XML_TEXT_NODE && $child->nodeValue =~ /^\s*$/) {
2649: next; # do not keep first and last whitespace nodes
2650: } else {
2651: if (!defined $previous && $child->nodeType == XML_TEXT_NODE) {
2652: # remove whitespace at the beginning
2653: my $value = $child->nodeValue;
2654: $value =~ s/^\s+//;
2655: $child->setData($value);
2656: }
2657: if (!defined $next && $child->nodeType == XML_TEXT_NODE) {
2658: # and at the end
2659: my $value = $child->nodeValue;
2660: $value =~ s/\s+$//;
2661: $child->setData($value);
2662: }
2663: }
2664: $node->removeChild($child);
2665: $parent->insertBefore($child, $node);
2666: $previous = $child;
2667: }
2668: $parent->removeChild($node);
2669: }
2670:
2671: ##
2672: # returns the trimmed attribute value if the attribute exists and is not blank, undef otherwise
2673: # @param {Node} node - the DOM node
2674: # @param {string} attribute_name - the attribute name
2675: ##
2676: sub get_non_empty_attribute {
2677: my ($node, $attribute_name) = @_;
2678: my $value = $node->getAttribute($attribute_name);
2679: if (defined $value && $value !~ /^\s*$/) {
2680: $value = trim($value);
2681: return($value);
2682: }
2683: return(undef);
2684: }
2685:
2686: ##
2687: # Returns a CSS property value from the style attribute of the element, or undef if not defined
2688: # @param {Element} el - the DOM element
2689: # @param {string} property_name - the CSS property name
2690: ##
2691: sub get_css_property {
2692: my ($el, $property_name) = @_;
2693: my $style = $el->getAttribute('style');
2694: if (defined $style) {
2695: $style =~ s/^\s*;\s*//;
2696: $style =~ s/\s*;\s*$//;
2697: } else {
2698: $style = '';
2699: }
2700: my @pairs = split(';', $style);
2701: foreach my $pair (@pairs) {
2702: my @name_value = split(':', $pair);
2703: if (scalar(@name_value) != 2) {
2704: next;
2705: }
2706: my $name = trim($name_value[0]);
2707: my $value = trim($name_value[1]);
2708: if (lc($name) eq $property_name) {
2709: return($value); # return the first one found
2710: }
2711: }
2712: return(undef);
2713: }
2714:
2715: ##
2716: # Returns the reference to a hash CSS property name => value from the style attribute of the element.
2717: # Returns an empty list if the style attribute is not defined,
2718: # @param {Element} el - the DOM element
2719: # @return {Hash<string, string>} reference to the hash property name => property value
2720: ##
2721: sub get_css_properties {
2722: my ($el) = @_;
2723: my $style = $el->getAttribute('style');
2724: if (defined $style) {
2725: $style =~ s/^\s*;\s*//;
2726: $style =~ s/\s*;\s*$//;
2727: } else {
2728: $style = '';
2729: }
2730: my @pairs = split(';', $style);
2731: tie (my %hash, 'Tie::IxHash', ());
2732: foreach my $pair (@pairs) {
2733: my @name_value = split(':', $pair);
2734: if (scalar(@name_value) != 2) {
2735: next;
2736: }
2737: my $name = trim($name_value[0]);
2738: my $value = trim($name_value[1]);
2739: if (defined $hash{$name}) {
2740: # duplicate property in the style attribute: keep only the last one
2741: delete $hash{$name};
2742: }
2743: $hash{$name} = $value;
2744: }
2745: return(\%hash);
2746: }
2747:
2748: ##
2749: # Sets a CSS property in the style attribute of an element
2750: # @param {Element} el - the DOM element
2751: # @param {string} property_name - the CSS property name
2752: # @param {string} property_value - the CSS property value
2753: ##
2754: sub set_css_property {
2755: my ($el, $property_name, $property_value) = @_;
2756: my $hash_ref = { $property_name => $property_value };
2757: set_css_properties($el, $hash_ref);
2758: }
2759:
2760: ##
2761: # Sets several CSS properties in the style attribute of an element
2762: # @param {Element} el - the DOM element
2763: # @param {Hash<string, string>} properties - reference to the hash property name => property value
2764: ##
2765: sub set_css_properties {
2766: my ($el, $properties) = @_;
2767: my $hash = get_css_properties($el);
2768: foreach my $property_name (keys %$properties) {
2769: my $property_value = $properties->{$property_name};
2770: if (defined $hash->{$property_name}) {
2771: delete $hash->{$property_name}; # to add the new one at the end
2772: }
2773: $hash->{$property_name} = $property_value;
2774: }
2775: my $style = '';
2776: foreach my $key (keys %$hash) {
2777: $style .= $key.':'.$hash->{$key}.'; ';
2778: }
2779: $style =~ s/; $//;
2780: $el->setAttribute('style', $style);
2781: }
2782:
2783: 1;
2784: __END__
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