1 /*
2 * Copyright (c) 1998, 2014, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation. Oracle designates this
8 * particular file as subject to the "Classpath" exception as provided
9 * by Oracle in the LICENSE file that accompanied this code.
10 *
11 * This code is distributed in the hope that it will be useful, but WITHOUT
12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
14 * version 2 for more details (a copy is included in the LICENSE file that
15 * accompanied this code).
16 *
17 * You should have received a copy of the GNU General Public License version
18 * 2 along with this work; if not, write to the Free Software Foundation,
19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
20 *
21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
22 * or visit www.oracle.com if you need additional information or have any
23 * questions.
24 */
25
26 package javax.swing.text.html.parser;
27
28 import javax.swing.text.SimpleAttributeSet;
29 import javax.swing.text.html.HTML;
30 import javax.swing.text.ChangedCharSetException;
31 import java.io.*;
32 import java.util.Hashtable;
33 import java.util.Properties;
34 import java.util.Vector;
35 import java.util.Enumeration;
36 import java.net.URL;
37
38 import sun.misc.MessageUtils;
39
40 /**
41 * A simple DTD-driven HTML parser. The parser reads an
42 * HTML file from an InputStream and calls various methods
43 * (which should be overridden in a subclass) when tags and
44 * data are encountered.
45 * <p>
46 * Unfortunately there are many badly implemented HTML parsers
47 * out there, and as a result there are many badly formatted
48 * HTML files. This parser attempts to parse most HTML files.
49 * This means that the implementation sometimes deviates from
50 * the SGML specification in favor of HTML.
51 * <p>
52 * The parser treats \r and \r\n as \n. Newlines after starttags
53 * and before end tags are ignored just as specified in the SGML/HTML
54 * specification.
55 * <p>
56 * The html spec does not specify how spaces are to be coalesced very well.
57 * Specifically, the following scenarios are not discussed (note that a
58 * space should be used here, but I am using &nbsp to force the space to
59 * be displayed):
60 * <p>
61 * '<b>blah <i> <strike> foo' which can be treated as:
62 * '<b>blah <i><strike>foo'
63 * <p>as well as:
64 * '<p><a href="xx"> <em>Using</em></a></p>'
65 * which appears to be treated as:
66 * '<p><a href="xx"><em>Using</em></a></p>'
67 * <p>
68 * If <code>strict</code> is false, when a tag that breaks flow,
69 * (<code>TagElement.breaksFlows</code>) or trailing whitespace is
70 * encountered, all whitespace will be ignored until a non whitespace
71 * character is encountered. This appears to give behavior closer to
72 * the popular browsers.
73 *
74 * @see DTD
75 * @see TagElement
76 * @see SimpleAttributeSet
77 * @author Arthur van Hoff
78 * @author Sunita Mani
79 */
80 public
81 class Parser implements DTDConstants {
82
83 private char text[] = new char[1024];
84 private int textpos = 0;
85 private TagElement last;
86 private boolean space;
87
88 private char str[] = new char[128];
89 private int strpos = 0;
90
91 protected DTD dtd = null;
92
93 private int ch;
94 private int ln;
95 private Reader in;
96
97 private Element recent;
98 private TagStack stack;
99 private boolean skipTag = false;
100 private TagElement lastFormSent = null;
101 private SimpleAttributeSet attributes = new SimpleAttributeSet();
102
103 // State for <html>, <head> and <body>. Since people like to slap
104 // together HTML documents without thinking, occasionally they
105 // have multiple instances of these tags. These booleans track
106 // the first sightings of these tags so they can be safely ignored
107 // by the parser if repeated.
108 private boolean seenHtml = false;
109 private boolean seenHead = false;
110 private boolean seenBody = false;
111
112 /**
113 * The html spec does not specify how spaces are coalesced very well.
114 * If strict == false, ignoreSpace is used to try and mimic the behavior
115 * of the popular browsers.
116 * <p>
117 * The problematic scenarios are:
118 * '<b>blah <i> <strike> foo' which can be treated as:
119 * '<b>blah <i><strike>foo'
120 * as well as:
121 * '<p><a href="xx"> <em>Using</em></a></p>'
122 * which appears to be treated as:
123 * '<p><a href="xx"><em>Using</em></a></p>'
124 * <p>
125 * When a tag that breaks flow, or trailing whitespace is encountered
126 * ignoreSpace is set to true. From then on, all whitespace will be
127 * ignored.
128 * ignoreSpace will be set back to false the first time a
129 * non whitespace character is encountered. This appears to give
130 * behavior closer to the popular browsers.
131 */
132 private boolean ignoreSpace;
133
134 /**
135 * This flag determines whether or not the Parser will be strict
136 * in enforcing SGML compatibility. If false, it will be lenient
137 * with certain common classes of erroneous HTML constructs.
138 * Strict or not, in either case an error will be recorded.
139 *
140 */
141 protected boolean strict = false;
142
143
144 /** Number of \r\n's encountered. */
145 private int crlfCount;
146 /** Number of \r's encountered. A \r\n will not increment this. */
147 private int crCount;
148 /** Number of \n's encountered. A \r\n will not increment this. */
149 private int lfCount;
150
151 //
152 // To correctly identify the start of a tag/comment/text we need two
153 // ivars. Two are needed as handleText isn't invoked until the tag
154 // after the text has been parsed, that is the parser parses the text,
155 // then a tag, then invokes handleText followed by handleStart.
156 //
157 /** The start position of the current block. Block is overloaded here,
158 * it really means the current start position for the current comment,
159 * tag, text. Use getBlockStartPosition to access this. */
160 private int currentBlockStartPos;
161 /** Start position of the last block. */
162 private int lastBlockStartPos;
163
164 /**
165 * array for mapping numeric references in range
166 * 130-159 to displayable Unicode characters.
167 */
168 private static final char[] cp1252Map = {
169 8218, // ‚
170 402, // ƒ
171 8222, // „
172 8230, // …
173 8224, // †
174 8225, // ‡
175 710, // ˆ
176 8240, // ‰
177 352, // Š
178 8249, // ‹
179 338, // Œ
180 141, //
181 142, // Ž
182 143, //
183 144, //
184 8216, // ‘
185 8217, // ’
186 8220, // “
187 8221, // ”
188 8226, // •
189 8211, // –
190 8212, // —
191 732, // ˜
192 8482, // ™
193 353, // š
194 8250, // ›
195 339, // œ
196 157, //
197 158, // ž
198 376 // Ÿ
199 };
200
201 public Parser(DTD dtd) {
202 this.dtd = dtd;
203 }
204
205
206 /**
207 * @return the line number of the line currently being parsed
208 */
209 protected int getCurrentLine() {
210 return ln;
211 }
212
213 /**
214 * Returns the start position of the current block. Block is
215 * overloaded here, it really means the current start position for
216 * the current comment tag, text, block.... This is provided for
217 * subclassers that wish to know the start of the current block when
218 * called with one of the handleXXX methods.
219 */
220 int getBlockStartPosition() {
221 return Math.max(0, lastBlockStartPos - 1);
222 }
223
224 /**
225 * Makes a TagElement.
226 */
227 protected TagElement makeTag(Element elem, boolean fictional) {
228 return new TagElement(elem, fictional);
229 }
230
231 protected TagElement makeTag(Element elem) {
232 return makeTag(elem, false);
233 }
234
235 protected SimpleAttributeSet getAttributes() {
236 return attributes;
237 }
238
239 protected void flushAttributes() {
240 attributes.removeAttributes(attributes);
241 }
242
243 /**
244 * Called when PCDATA is encountered.
245 */
246 protected void handleText(char text[]) {
247 }
248
249 /**
250 * Called when an HTML title tag is encountered.
251 */
252 protected void handleTitle(char text[]) {
253 // default behavior is to call handleText. Subclasses
254 // can override if necessary.
255 handleText(text);
256 }
257
258 /**
259 * Called when an HTML comment is encountered.
260 */
261 protected void handleComment(char text[]) {
262 }
263
264 protected void handleEOFInComment() {
265 // We've reached EOF. Our recovery strategy is to
266 // see if we have more than one line in the comment;
267 // if so, we pretend that the comment was an unterminated
268 // single line comment, and reparse the lines after the
269 // first line as normal HTML content.
270
271 int commentEndPos = strIndexOf('\n');
272 if (commentEndPos >= 0) {
273 handleComment(getChars(0, commentEndPos));
274 try {
275 in.close();
276 in = new CharArrayReader(getChars(commentEndPos + 1));
277 ch = '>';
278 } catch (IOException e) {
279 error("ioexception");
280 }
281
282 resetStrBuffer();
283 } else {
284 // no newline, so signal an error
285 error("eof.comment");
286 }
287 }
288
289 /**
290 * Called when an empty tag is encountered.
291 */
292 protected void handleEmptyTag(TagElement tag) throws ChangedCharSetException {
293 }
294
295 /**
296 * Called when a start tag is encountered.
297 */
298 protected void handleStartTag(TagElement tag) {
299 }
300
301 /**
302 * Called when an end tag is encountered.
303 */
304 protected void handleEndTag(TagElement tag) {
305 }
306
307 /**
308 * An error has occurred.
309 */
310 protected void handleError(int ln, String msg) {
311 /*
312 Thread.dumpStack();
313 System.out.println("**** " + stack);
314 System.out.println("line " + ln + ": error: " + msg);
315 System.out.println();
316 */
317 }
318
319 /**
320 * Output text.
321 */
322 void handleText(TagElement tag) {
323 if (tag.breaksFlow()) {
324 space = false;
325 if (!strict) {
326 ignoreSpace = true;
327 }
328 }
329 if (textpos == 0) {
330 if ((!space) || (stack == null) || last.breaksFlow() ||
331 !stack.advance(dtd.pcdata)) {
332 last = tag;
333 space = false;
334 lastBlockStartPos = currentBlockStartPos;
335 return;
336 }
337 }
338 if (space) {
339 if (!ignoreSpace) {
340 // enlarge buffer if needed
341 if (textpos + 1 > text.length) {
342 char newtext[] = new char[text.length + 200];
343 System.arraycopy(text, 0, newtext, 0, text.length);
344 text = newtext;
345 }
346
347 // output pending space
348 text[textpos++] = ' ';
349 if (!strict && !tag.getElement().isEmpty()) {
350 ignoreSpace = true;
351 }
352 }
353 space = false;
354 }
355 char newtext[] = new char[textpos];
356 System.arraycopy(text, 0, newtext, 0, textpos);
357 // Handles cases of bad html where the title tag
358 // was getting lost when we did error recovery.
359 if (tag.getElement().getName().equals("title")) {
360 handleTitle(newtext);
361 } else {
362 handleText(newtext);
363 }
364 lastBlockStartPos = currentBlockStartPos;
365 textpos = 0;
366 last = tag;
367 space = false;
368 }
369
370 /**
371 * Invoke the error handler.
372 */
373 protected void error(String err, String arg1, String arg2,
374 String arg3) {
375 handleError(ln, err + " " + arg1 + " " + arg2 + " " + arg3);
376 }
377
378 protected void error(String err, String arg1, String arg2) {
379 error(err, arg1, arg2, "?");
380 }
381 protected void error(String err, String arg1) {
382 error(err, arg1, "?", "?");
383 }
384 protected void error(String err) {
385 error(err, "?", "?", "?");
386 }
387
388
389 /**
390 * Handle a start tag. The new tag is pushed
391 * onto the tag stack. The attribute list is
392 * checked for required attributes.
393 */
394 protected void startTag(TagElement tag) throws ChangedCharSetException {
395 Element elem = tag.getElement();
396
397 // If the tag is an empty tag and texpos != 0
398 // this implies that there is text before the
399 // start tag that needs to be processed before
400 // handling the tag.
401 //
402 if (!elem.isEmpty() ||
403 ((last != null) && !last.breaksFlow()) ||
404 (textpos != 0)) {
405 handleText(tag);
406 } else {
407 // this variable gets updated in handleText().
408 // Since in this case we do not call handleText()
409 // we need to update it here.
410 //
411 last = tag;
412 // Note that we should really check last.breakFlows before
413 // assuming this should be false.
414 space = false;
415 }
416 lastBlockStartPos = currentBlockStartPos;
417
418 // check required attributes
419 for (AttributeList a = elem.atts ; a != null ; a = a.next) {
420 if ((a.modifier == REQUIRED) &&
421 ((attributes.isEmpty()) ||
422 ((!attributes.isDefined(a.name)) &&
423 (!attributes.isDefined(HTML.getAttributeKey(a.name)))))) {
424 error("req.att ", a.getName(), elem.getName());
425 }
426 }
427
428 if (elem.isEmpty()) {
429 handleEmptyTag(tag);
430 /*
431 } else if (elem.getName().equals("form")) {
432 handleStartTag(tag);
433 */
434 } else {
435 recent = elem;
436 stack = new TagStack(tag, stack);
437 handleStartTag(tag);
438 }
439 }
440
441 /**
442 * Handle an end tag. The end tag is popped
443 * from the tag stack.
444 */
445 protected void endTag(boolean omitted) {
446 handleText(stack.tag);
447
448 if (omitted && !stack.elem.omitEnd()) {
449 error("end.missing", stack.elem.getName());
450 } else if (!stack.terminate()) {
451 error("end.unexpected", stack.elem.getName());
452 }
453
454 // handle the tag
455 handleEndTag(stack.tag);
456 stack = stack.next;
457 recent = (stack != null) ? stack.elem : null;
458 }
459
460
461 boolean ignoreElement(Element elem) {
462
463 String stackElement = stack.elem.getName();
464 String elemName = elem.getName();
465 /* We ignore all elements that are not valid in the context of
466 a table except <td>, <th> (these we handle in
467 legalElementContext()) and #pcdata. We also ignore the
468 <font> tag in the context of <ul> and <ol> We additonally
469 ignore the <meta> and the <style> tag if the body tag has
470 been seen. **/
471 if ((elemName.equals("html") && seenHtml) ||
472 (elemName.equals("head") && seenHead) ||
473 (elemName.equals("body") && seenBody)) {
474 return true;
475 }
476 if (elemName.equals("dt") || elemName.equals("dd")) {
477 TagStack s = stack;
478 while (s != null && !s.elem.getName().equals("dl")) {
479 s = s.next;
480 }
481 if (s == null) {
482 return true;
483 }
484 }
485
486 if (((stackElement.equals("table")) &&
487 (!elemName.equals("#pcdata")) && (!elemName.equals("input"))) ||
488 ((elemName.equals("font")) &&
489 (stackElement.equals("ul") || stackElement.equals("ol"))) ||
490 (elemName.equals("meta") && stack != null) ||
491 (elemName.equals("style") && seenBody) ||
492 (stackElement.equals("table") && elemName.equals("a"))) {
493 return true;
494 }
495 return false;
496 }
497
498
499 /**
500 * Marks the first time a tag has been seen in a document
501 */
502
503 protected void markFirstTime(Element elem) {
504 String elemName = elem.getName();
505 if (elemName.equals("html")) {
506 seenHtml = true;
507 } else if (elemName.equals("head")) {
508 seenHead = true;
509 } else if (elemName.equals("body")) {
510 if (buf.length == 1) {
511 // Refer to note in definition of buf for details on this.
512 char[] newBuf = new char[256];
513
514 newBuf[0] = buf[0];
515 buf = newBuf;
516 }
517 seenBody = true;
518 }
519 }
520
521 /**
522 * Create a legal content for an element.
523 */
524 boolean legalElementContext(Element elem) throws ChangedCharSetException {
525
526 // System.out.println("-- legalContext -- " + elem);
527
528 // Deal with the empty stack
529 if (stack == null) {
530 // System.out.println("-- stack is empty");
531 if (elem != dtd.html) {
532 // System.out.println("-- pushing html");
533 startTag(makeTag(dtd.html, true));
534 return legalElementContext(elem);
535 }
536 return true;
537 }
538
539 // Is it allowed in the current context
540 if (stack.advance(elem)) {
541 // System.out.println("-- legal context");
542 markFirstTime(elem);
543 return true;
544 }
545 boolean insertTag = false;
546
547 // The use of all error recovery strategies are contingent
548 // on the value of the strict property.
549 //
550 // These are commonly occurring errors. if insertTag is true,
551 // then we want to adopt an error recovery strategy that
552 // involves attempting to insert an additional tag to
553 // legalize the context. The two errors addressed here
554 // are:
555 // 1) when a <td> or <th> is seen soon after a <table> tag.
556 // In this case we insert a <tr>.
557 // 2) when any other tag apart from a <tr> is seen
558 // in the context of a <tr>. In this case we would
559 // like to add a <td>. If a <tr> is seen within a
560 // <tr> context, then we will close out the current
561 // <tr>.
562 //
563 // This insertion strategy is handled later in the method.
564 // The reason for checking this now, is that in other cases
565 // we would like to apply other error recovery strategies for example
566 // ignoring tags.
567 //
568 // In certain cases it is better to ignore a tag than try to
569 // fix the situation. So the first test is to see if this
570 // is what we need to do.
571 //
572 String stackElemName = stack.elem.getName();
573 String elemName = elem.getName();
574
575
576 if (!strict &&
577 ((stackElemName.equals("table") && elemName.equals("td")) ||
578 (stackElemName.equals("table") && elemName.equals("th")) ||
579 (stackElemName.equals("tr") && !elemName.equals("tr")))){
580 insertTag = true;
581 }
582
583
584 if (!strict && !insertTag && (stack.elem.getName() != elem.getName() ||
585 elem.getName().equals("body"))) {
586 if (skipTag = ignoreElement(elem)) {
587 error("tag.ignore", elem.getName());
588 return skipTag;
589 }
590 }
591
592 // Check for anything after the start of the table besides tr, td, th
593 // or caption, and if those aren't there, insert the <tr> and call
594 // legalElementContext again.
595 if (!strict && stackElemName.equals("table") &&
596 !elemName.equals("tr") && !elemName.equals("td") &&
597 !elemName.equals("th") && !elemName.equals("caption")) {
598 Element e = dtd.getElement("tr");
599 TagElement t = makeTag(e, true);
600 legalTagContext(t);
601 startTag(t);
602 error("start.missing", elem.getName());
603 return legalElementContext(elem);
604 }
605
606 // They try to find a legal context by checking if the current
607 // tag is valid in an enclosing context. If so
608 // close out the tags by outputing end tags and then
609 // insert the current tag. If the tags that are
610 // being closed out do not have an optional end tag
611 // specification in the DTD then an html error is
612 // reported.
613 //
614 if (!insertTag && stack.terminate() && (!strict || stack.elem.omitEnd())) {
615 for (TagStack s = stack.next ; s != null ; s = s.next) {
616 if (s.advance(elem)) {
617 while (stack != s) {
618 endTag(true);
619 }
620 return true;
621 }
622 if (!s.terminate() || (strict && !s.elem.omitEnd())) {
623 break;
624 }
625 }
626 }
627
628 // Check if we know what tag is expected next.
629 // If so insert the tag. Report an error if the
630 // tag does not have its start tag spec in the DTD as optional.
631 //
632 Element next = stack.first();
633 if (next != null && (!strict || next.omitStart()) &&
634 !(next==dtd.head && elem==dtd.pcdata) ) {
635 // System.out.println("-- omitting start tag: " + next);
636 TagElement t = makeTag(next, true);
637 legalTagContext(t);
638 startTag(t);
639 if (!next.omitStart()) {
640 error("start.missing", elem.getName());
641 }
642 return legalElementContext(elem);
643 }
644
645
646 // Traverse the list of expected elements and determine if adding
647 // any of these elements would make for a legal context.
648 //
649
650 if (!strict) {
651 ContentModel content = stack.contentModel();
652 Vector<Element> elemVec = new Vector<Element>();
653 if (content != null) {
654 content.getElements(elemVec);
655 for (Element e : elemVec) {
656 // Ensure that this element has not been included as
657 // part of the exclusions in the DTD.
658 //
659 if (stack.excluded(e.getIndex())) {
660 continue;
661 }
662
663 boolean reqAtts = false;
664
665 for (AttributeList a = e.getAttributes(); a != null ; a = a.next) {
666 if (a.modifier == REQUIRED) {
667 reqAtts = true;
668 break;
669 }
670 }
671 // Ensure that no tag that has required attributes
672 // gets inserted.
673 //
674 if (reqAtts) {
675 continue;
676 }
677
678 ContentModel m = e.getContent();
679 if (m != null && m.first(elem)) {
680 // System.out.println("-- adding a legal tag: " + e);
681 TagElement t = makeTag(e, true);
682 legalTagContext(t);
683 startTag(t);
684 error("start.missing", e.getName());
685 return legalElementContext(elem);
686 }
687 }
688 }
689 }
690
691 // Check if the stack can be terminated. If so add the appropriate
692 // end tag. Report an error if the tag being ended does not have its
693 // end tag spec in the DTD as optional.
694 //
695 if (stack.terminate() && (stack.elem != dtd.body) && (!strict || stack.elem.omitEnd())) {
696 // System.out.println("-- omitting end tag: " + stack.elem);
697 if (!stack.elem.omitEnd()) {
698 error("end.missing", elem.getName());
699 }
700
701 endTag(true);
702 return legalElementContext(elem);
703 }
704
705 // At this point we know that something is screwed up.
706 return false;
707 }
708
709 /**
710 * Create a legal context for a tag.
711 */
712 void legalTagContext(TagElement tag) throws ChangedCharSetException {
713 if (legalElementContext(tag.getElement())) {
714 markFirstTime(tag.getElement());
715 return;
716 }
717
718 // Avoid putting a block tag in a flow tag.
719 if (tag.breaksFlow() && (stack != null) && !stack.tag.breaksFlow()) {
720 endTag(true);
721 legalTagContext(tag);
722 return;
723 }
724
725 // Avoid putting something wierd in the head of the document.
726 for (TagStack s = stack ; s != null ; s = s.next) {
727 if (s.tag.getElement() == dtd.head) {
728 while (stack != s) {
729 endTag(true);
730 }
731 endTag(true);
732 legalTagContext(tag);
733 return;
734 }
735 }
736
737 // Everything failed
738 error("tag.unexpected", tag.getElement().getName());
739 }
740
741 /**
742 * Error context. Something went wrong, make sure we are in
743 * the document's body context
744 */
745 void errorContext() throws ChangedCharSetException {
746 for (; (stack != null) && (stack.tag.getElement() != dtd.body) ; stack = stack.next) {
747 handleEndTag(stack.tag);
748 }
749 if (stack == null) {
750 legalElementContext(dtd.body);
751 startTag(makeTag(dtd.body, true));
752 }
753 }
754
755 /**
756 * Add a char to the string buffer.
757 */
758 void addString(int c) {
759 if (strpos == str.length) {
760 char newstr[] = new char[str.length + 128];
761 System.arraycopy(str, 0, newstr, 0, str.length);
762 str = newstr;
763 }
764 str[strpos++] = (char)c;
765 }
766
767 /**
768 * Get the string that's been accumulated.
769 */
770 String getString(int pos) {
771 char newStr[] = new char[strpos - pos];
772 System.arraycopy(str, pos, newStr, 0, strpos - pos);
773 strpos = pos;
774 return new String(newStr);
775 }
776
777 char[] getChars(int pos) {
778 char newStr[] = new char[strpos - pos];
779 System.arraycopy(str, pos, newStr, 0, strpos - pos);
780 strpos = pos;
781 return newStr;
782 }
783
784 char[] getChars(int pos, int endPos) {
785 char newStr[] = new char[endPos - pos];
786 System.arraycopy(str, pos, newStr, 0, endPos - pos);
787 // REMIND: it's not clear whether this version should set strpos or not
788 // strpos = pos;
789 return newStr;
790 }
791
792 void resetStrBuffer() {
793 strpos = 0;
794 }
795
796 int strIndexOf(char target) {
797 for (int i = 0; i < strpos; i++) {
798 if (str[i] == target) {
799 return i;
800 }
801 }
802
803 return -1;
804 }
805
806 /**
807 * Skip space.
808 * [5] 297:5
809 */
810 void skipSpace() throws IOException {
811 while (true) {
812 switch (ch) {
813 case '\n':
814 ln++;
815 ch = readCh();
816 lfCount++;
817 break;
818
819 case '\r':
820 ln++;
821 if ((ch = readCh()) == '\n') {
822 ch = readCh();
823 crlfCount++;
824 }
825 else {
826 crCount++;
827 }
828 break;
829 case ' ':
830 case '\t':
831 ch = readCh();
832 break;
833
834 default:
835 return;
836 }
837 }
838 }
839
840 /**
841 * Parse identifier. Uppercase characters are folded
842 * to lowercase when lower is true. Returns falsed if
843 * no identifier is found. [55] 346:17
844 */
845 boolean parseIdentifier(boolean lower) throws IOException {
846 switch (ch) {
847 case 'A': case 'B': case 'C': case 'D': case 'E': case 'F':
848 case 'G': case 'H': case 'I': case 'J': case 'K': case 'L':
849 case 'M': case 'N': case 'O': case 'P': case 'Q': case 'R':
850 case 'S': case 'T': case 'U': case 'V': case 'W': case 'X':
851 case 'Y': case 'Z':
852 if (lower) {
853 ch = 'a' + (ch - 'A');
854 }
855
856 case 'a': case 'b': case 'c': case 'd': case 'e': case 'f':
857 case 'g': case 'h': case 'i': case 'j': case 'k': case 'l':
858 case 'm': case 'n': case 'o': case 'p': case 'q': case 'r':
859 case 's': case 't': case 'u': case 'v': case 'w': case 'x':
860 case 'y': case 'z':
861 break;
862
863 default:
864 return false;
865 }
866
867 while (true) {
868 addString(ch);
869
870 switch (ch = readCh()) {
871 case 'A': case 'B': case 'C': case 'D': case 'E': case 'F':
872 case 'G': case 'H': case 'I': case 'J': case 'K': case 'L':
873 case 'M': case 'N': case 'O': case 'P': case 'Q': case 'R':
874 case 'S': case 'T': case 'U': case 'V': case 'W': case 'X':
875 case 'Y': case 'Z':
876 if (lower) {
877 ch = 'a' + (ch - 'A');
878 }
879
880 case 'a': case 'b': case 'c': case 'd': case 'e': case 'f':
881 case 'g': case 'h': case 'i': case 'j': case 'k': case 'l':
882 case 'm': case 'n': case 'o': case 'p': case 'q': case 'r':
883 case 's': case 't': case 'u': case 'v': case 'w': case 'x':
884 case 'y': case 'z':
885
886 case '0': case '1': case '2': case '3': case '4':
887 case '5': case '6': case '7': case '8': case '9':
888
889 case '.': case '-':
890
891 case '_': // not officially allowed
892 break;
893
894 default:
895 return true;
896 }
897 }
898 }
899
900 /**
901 * Parse an entity reference. [59] 350:17
902 */
903 private char[] parseEntityReference() throws IOException {
904 int pos = strpos;
905
906 if ((ch = readCh()) == '#') {
907 int n = 0;
908 ch = readCh();
909 if ((ch >= '0') && (ch <= '9') ||
910 ch == 'x' || ch == 'X') {
911
912 if ((ch >= '0') && (ch <= '9')) {
913 // parse decimal reference
914 while ((ch >= '0') && (ch <= '9')) {
915 n = (n * 10) + ch - '0';
916 ch = readCh();
917 }
918 } else {
919 // parse hexadecimal reference
920 ch = readCh();
921 char lch = (char) Character.toLowerCase(ch);
922 while ((lch >= '0') && (lch <= '9') ||
923 (lch >= 'a') && (lch <= 'f')) {
924 if (lch >= '0' && lch <= '9') {
925 n = (n * 16) + lch - '0';
926 } else {
927 n = (n * 16) + lch - 'a' + 10;
928 }
929 ch = readCh();
930 lch = (char) Character.toLowerCase(ch);
931 }
932 }
933 switch (ch) {
934 case '\n':
935 ln++;
936 ch = readCh();
937 lfCount++;
938 break;
939
940 case '\r':
941 ln++;
942 if ((ch = readCh()) == '\n') {
943 ch = readCh();
944 crlfCount++;
945 }
946 else {
947 crCount++;
948 }
949 break;
950
951 case ';':
952 ch = readCh();
953 break;
954 }
955 char data[] = mapNumericReference(n);
956 return data;
957 }
958 addString('#');
959 if (!parseIdentifier(false)) {
960 error("ident.expected");
961 strpos = pos;
962 char data[] = {'&', '#'};
963 return data;
964 }
965 } else if (!parseIdentifier(false)) {
966 char data[] = {'&'};
967 return data;
968 }
969
970 boolean semicolon = false;
971
972 switch (ch) {
973 case '\n':
974 ln++;
975 ch = readCh();
976 lfCount++;
977 break;
978
979 case '\r':
980 ln++;
981 if ((ch = readCh()) == '\n') {
982 ch = readCh();
983 crlfCount++;
984 }
985 else {
986 crCount++;
987 }
988 break;
989
990 case ';':
991 semicolon = true;
992
993 ch = readCh();
994 break;
995 }
996
997 String nm = getString(pos);
998 Entity ent = dtd.getEntity(nm);
999
1000 // entities are case sensitive - however if strict
1001 // is false then we will try to make a match by
1002 // converting the string to all lowercase.
1003 //
1004 if (!strict && (ent == null)) {
1005 ent = dtd.getEntity(nm.toLowerCase());
1006 }
1007 if ((ent == null) || !ent.isGeneral()) {
1008
1009 if (nm.length() == 0) {
1010 error("invalid.entref", nm);
1011 return new char[0];
1012 }
1013 /* given that there is not a match restore the entity reference */
1014 String str = "&" + nm + (semicolon ? ";" : "");
1015
1016 char b[] = new char[str.length()];
1017 str.getChars(0, b.length, b, 0);
1018 return b;
1019 }
1020 return ent.getData();
1021 }
1022
1023 /**
1024 * Converts numeric character reference to char array.
1025 *
1026 * Normally the code in a reference should be always converted
1027 * to the Unicode character with the same code, but due to
1028 * wide usage of Cp1252 charset most browsers map numeric references
1029 * in the range 130-159 (which are control chars in Unicode set)
1030 * to displayable characters with other codes.
1031 *
1032 * @param c the code of numeric character reference.
1033 * @return a char array corresponding to the reference code.
1034 */
1035 private char[] mapNumericReference(int c) {
1036 char[] data;
1037 if (c >= 0xffff) { // outside unicode BMP.
1038 try {
1039 data = Character.toChars(c);
1040 } catch (IllegalArgumentException e) {
1041 data = new char[0];
1042 }
1043 } else {
1044 data = new char[1];
1045 data[0] = (c < 130 || c > 159) ? (char) c : cp1252Map[c - 130];
1046 }
1047 return data;
1048 }
1049
1050 /**
1051 * Parse a comment. [92] 391:7
1052 */
1053 void parseComment() throws IOException {
1054
1055 while (true) {
1056 int c = ch;
1057 switch (c) {
1058 case '-':
1059 /** Presuming that the start string of a comment "<!--" has
1060 already been parsed, the '-' character is valid only as
1061 part of a comment termination and further more it must
1062 be present in even numbers. Hence if strict is true, we
1063 presume the comment has been terminated and return.
1064 However if strict is false, then there is no even number
1065 requirement and this character can appear anywhere in the
1066 comment. The parser reads on until it sees the following
1067 pattern: "-->" or "--!>".
1068 **/
1069 if (!strict && (strpos != 0) && (str[strpos - 1] == '-')) {
1070 if ((ch = readCh()) == '>') {
1071 return;
1072 }
1073 if (ch == '!') {
1074 if ((ch = readCh()) == '>') {
1075 return;
1076 } else {
1077 /* to account for extra read()'s that happened */
1078 addString('-');
1079 addString('!');
1080 continue;
1081 }
1082 }
1083 break;
1084 }
1085
1086 if ((ch = readCh()) == '-') {
1087 ch = readCh();
1088 if (strict || ch == '>') {
1089 return;
1090 }
1091 if (ch == '!') {
1092 if ((ch = readCh()) == '>') {
1093 return;
1094 } else {
1095 /* to account for extra read()'s that happened */
1096 addString('-');
1097 addString('!');
1098 continue;
1099 }
1100 }
1101 /* to account for the extra read() */
1102 addString('-');
1103 }
1104 break;
1105
1106 case -1:
1107 handleEOFInComment();
1108 return;
1109
1110 case '\n':
1111 ln++;
1112 ch = readCh();
1113 lfCount++;
1114 break;
1115
1116 case '>':
1117 ch = readCh();
1118 break;
1119
1120 case '\r':
1121 ln++;
1122 if ((ch = readCh()) == '\n') {
1123 ch = readCh();
1124 crlfCount++;
1125 }
1126 else {
1127 crCount++;
1128 }
1129 c = '\n';
1130 break;
1131 default:
1132 ch = readCh();
1133 break;
1134 }
1135
1136 addString(c);
1137 }
1138 }
1139
1140 /**
1141 * Parse literal content. [46] 343:1 and [47] 344:1
1142 */
1143 void parseLiteral(boolean replace) throws IOException {
1144 while (true) {
1145 int c = ch;
1146 switch (c) {
1147 case -1:
1148 error("eof.literal", stack.elem.getName());
1149 endTag(true);
1150 return;
1151
1152 case '>':
1153 ch = readCh();
1154 int i = textpos - (stack.elem.name.length() + 2), j = 0;
1155
1156 // match end tag
1157 if ((i >= 0) && (text[i++] == '<') && (text[i] == '/')) {
1158 while ((++i < textpos) &&
1159 (Character.toLowerCase(text[i]) == stack.elem.name.charAt(j++)));
1160 if (i == textpos) {
1161 textpos -= (stack.elem.name.length() + 2);
1162 if ((textpos > 0) && (text[textpos-1] == '\n')) {
1163 textpos--;
1164 }
1165 endTag(false);
1166 return;
1167 }
1168 }
1169 break;
1170
1171 case '&':
1172 char data[] = parseEntityReference();
1173 if (textpos + data.length > text.length) {
1174 char newtext[] = new char[Math.max(textpos + data.length + 128, text.length * 2)];
1175 System.arraycopy(text, 0, newtext, 0, text.length);
1176 text = newtext;
1177 }
1178 System.arraycopy(data, 0, text, textpos, data.length);
1179 textpos += data.length;
1180 continue;
1181
1182 case '\n':
1183 ln++;
1184 ch = readCh();
1185 lfCount++;
1186 break;
1187
1188 case '\r':
1189 ln++;
1190 if ((ch = readCh()) == '\n') {
1191 ch = readCh();
1192 crlfCount++;
1193 }
1194 else {
1195 crCount++;
1196 }
1197 c = '\n';
1198 break;
1199 default:
1200 ch = readCh();
1201 break;
1202 }
1203
1204 // output character
1205 if (textpos == text.length) {
1206 char newtext[] = new char[text.length + 128];
1207 System.arraycopy(text, 0, newtext, 0, text.length);
1208 text = newtext;
1209 }
1210 text[textpos++] = (char)c;
1211 }
1212 }
1213
1214 /**
1215 * Parse attribute value. [33] 331:1
1216 */
1217 String parseAttributeValue(boolean lower) throws IOException {
1218 int delim = -1;
1219
1220 // Check for a delimiter
1221 switch(ch) {
1222 case '\'':
1223 case '"':
1224 delim = ch;
1225 ch = readCh();
1226 break;
1227 }
1228
1229 // Parse the rest of the value
1230 while (true) {
1231 int c = ch;
1232
1233 switch (c) {
1234 case '\n':
1235 ln++;
1236 ch = readCh();
1237 lfCount++;
1238 if (delim < 0) {
1239 return getString(0);
1240 }
1241 break;
1242
1243 case '\r':
1244 ln++;
1245
1246 if ((ch = readCh()) == '\n') {
1247 ch = readCh();
1248 crlfCount++;
1249 }
1250 else {
1251 crCount++;
1252 }
1253 if (delim < 0) {
1254 return getString(0);
1255 }
1256 break;
1257
1258 case '\t':
1259 if (delim < 0)
1260 c = ' ';
1261 case ' ':
1262 ch = readCh();
1263 if (delim < 0) {
1264 return getString(0);
1265 }
1266 break;
1267
1268 case '>':
1269 case '<':
1270 if (delim < 0) {
1271 return getString(0);
1272 }
1273 ch = readCh();
1274 break;
1275
1276 case '\'':
1277 case '"':
1278 ch = readCh();
1279 if (c == delim) {
1280 return getString(0);
1281 } else if (delim == -1) {
1282 error("attvalerr");
1283 if (strict || ch == ' ') {
1284 return getString(0);
1285 } else {
1286 continue;
1287 }
1288 }
1289 break;
1290
1291 case '=':
1292 if (delim < 0) {
1293 /* In SGML a construct like <img src=/cgi-bin/foo?x=1>
1294 is considered invalid since an = sign can only be contained
1295 in an attributes value if the string is quoted.
1296 */
1297 error("attvalerr");
1298 /* If strict is true then we return with the string we have thus far.
1299 Otherwise we accept the = sign as part of the attribute's value and
1300 process the rest of the img tag. */
1301 if (strict) {
1302 return getString(0);
1303 }
1304 }
1305 ch = readCh();
1306 break;
1307
1308 case '&':
1309 if (strict && delim < 0) {
1310 ch = readCh();
1311 break;
1312 }
1313
1314 char data[] = parseEntityReference();
1315 for (int i = 0 ; i < data.length ; i++) {
1316 c = data[i];
1317 addString((lower && (c >= 'A') && (c <= 'Z')) ? 'a' + c - 'A' : c);
1318 }
1319 continue;
1320
1321 case -1:
1322 return getString(0);
1323
1324 default:
1325 if (lower && (c >= 'A') && (c <= 'Z')) {
1326 c = 'a' + c - 'A';
1327 }
1328 ch = readCh();
1329 break;
1330 }
1331 addString(c);
1332 }
1333 }
1334
1335
1336 /**
1337 * Parse attribute specification List. [31] 327:17
1338 */
1339 void parseAttributeSpecificationList(Element elem) throws IOException {
1340
1341 while (true) {
1342 skipSpace();
1343
1344 switch (ch) {
1345 case '/':
1346 case '>':
1347 case '<':
1348 case -1:
1349 return;
1350
1351 case '-':
1352 if ((ch = readCh()) == '-') {
1353 ch = readCh();
1354 parseComment();
1355 strpos = 0;
1356 } else {
1357 error("invalid.tagchar", "-", elem.getName());
1358 ch = readCh();
1359 }
1360 continue;
1361 }
1362
1363 AttributeList att;
1364 String attname;
1365 String attvalue;
1366
1367 if (parseIdentifier(true)) {
1368 attname = getString(0);
1369 skipSpace();
1370 if (ch == '=') {
1371 ch = readCh();
1372 skipSpace();
1373 att = elem.getAttribute(attname);
1374 // Bug ID 4102750
1375 // Load the NAME of an Attribute Case Sensitive
1376 // The case of the NAME must be intact
1377 // MG 021898
1378 attvalue = parseAttributeValue((att != null) && (att.type != CDATA) && (att.type != NOTATION) && (att.type != NAME));
1379 // attvalue = parseAttributeValue((att != null) && (att.type != CDATA) && (att.type != NOTATION));
1380 } else {
1381 attvalue = attname;
1382 att = elem.getAttributeByValue(attvalue);
1383 if (att == null) {
1384 att = elem.getAttribute(attname);
1385 if (att != null) {
1386 attvalue = att.getValue();
1387 }
1388 else {
1389 // Make it null so that NULL_ATTRIBUTE_VALUE is
1390 // used
1391 attvalue = null;
1392 }
1393 }
1394 }
1395 } else if (!strict && ch == ',') { // allows for comma separated attribute-value pairs
1396 ch = readCh();
1397 continue;
1398 } else if (!strict && ch == '"') { // allows for quoted attributes
1399 ch = readCh();
1400 skipSpace();
1401 if (parseIdentifier(true)) {
1402 attname = getString(0);
1403 if (ch == '"') {
1404 ch = readCh();
1405 }
1406 skipSpace();
1407 if (ch == '=') {
1408 ch = readCh();
1409 skipSpace();
1410 att = elem.getAttribute(attname);
1411 attvalue = parseAttributeValue((att != null) &&
1412 (att.type != CDATA) &&
1413 (att.type != NOTATION));
1414 } else {
1415 attvalue = attname;
1416 att = elem.getAttributeByValue(attvalue);
1417 if (att == null) {
1418 att = elem.getAttribute(attname);
1419 if (att != null) {
1420 attvalue = att.getValue();
1421 }
1422 }
1423 }
1424 } else {
1425 char str[] = {(char)ch};
1426 error("invalid.tagchar", new String(str), elem.getName());
1427 ch = readCh();
1428 continue;
1429 }
1430 } else if (!strict && (attributes.isEmpty()) && (ch == '=')) {
1431 ch = readCh();
1432 skipSpace();
1433 attname = elem.getName();
1434 att = elem.getAttribute(attname);
1435 attvalue = parseAttributeValue((att != null) &&
1436 (att.type != CDATA) &&
1437 (att.type != NOTATION));
1438 } else if (!strict && (ch == '=')) {
1439 ch = readCh();
1440 skipSpace();
1441 attvalue = parseAttributeValue(true);
1442 error("attvalerr");
1443 return;
1444 } else {
1445 char str[] = {(char)ch};
1446 error("invalid.tagchar", new String(str), elem.getName());
1447 if (!strict) {
1448 ch = readCh();
1449 continue;
1450 } else {
1451 return;
1452 }
1453 }
1454
1455 if (att != null) {
1456 attname = att.getName();
1457 } else {
1458 error("invalid.tagatt", attname, elem.getName());
1459 }
1460
1461 // Check out the value
1462 if (attributes.isDefined(attname)) {
1463 error("multi.tagatt", attname, elem.getName());
1464 }
1465 if (attvalue == null) {
1466 attvalue = ((att != null) && (att.value != null)) ? att.value :
1467 HTML.NULL_ATTRIBUTE_VALUE;
1468 } else if ((att != null) && (att.values != null) && !att.values.contains(attvalue)) {
1469 error("invalid.tagattval", attname, elem.getName());
1470 }
1471 HTML.Attribute attkey = HTML.getAttributeKey(attname);
1472 if (attkey == null) {
1473 attributes.addAttribute(attname, attvalue);
1474 } else {
1475 attributes.addAttribute(attkey, attvalue);
1476 }
1477 }
1478 }
1479
1480 /**
1481 * Parses th Document Declaration Type markup declaration.
1482 * Currently ignores it.
1483 */
1484 public String parseDTDMarkup() throws IOException {
1485
1486 StringBuilder strBuff = new StringBuilder();
1487 ch = readCh();
1488 while(true) {
1489 switch (ch) {
1490 case '>':
1491 ch = readCh();
1492 return strBuff.toString();
1493 case -1:
1494 error("invalid.markup");
1495 return strBuff.toString();
1496 case '\n':
1497 ln++;
1498 ch = readCh();
1499 lfCount++;
1500 break;
1501 case '"':
1502 ch = readCh();
1503 break;
1504 case '\r':
1505 ln++;
1506 if ((ch = readCh()) == '\n') {
1507 ch = readCh();
1508 crlfCount++;
1509 }
1510 else {
1511 crCount++;
1512 }
1513 break;
1514 default:
1515 strBuff.append((char)(ch & 0xFF));
1516 ch = readCh();
1517 break;
1518 }
1519 }
1520 }
1521
1522 /**
1523 * Parse markup declarations.
1524 * Currently only handles the Document Type Declaration markup.
1525 * Returns true if it is a markup declaration false otherwise.
1526 */
1527 protected boolean parseMarkupDeclarations(StringBuffer strBuff) throws IOException {
1528
1529 /* Currently handles only the DOCTYPE */
1530 if ((strBuff.length() == "DOCTYPE".length()) &&
1531 (strBuff.toString().toUpperCase().equals("DOCTYPE"))) {
1532 parseDTDMarkup();
1533 return true;
1534 }
1535 return false;
1536 }
1537
1538 /**
1539 * Parse an invalid tag.
1540 */
1541 void parseInvalidTag() throws IOException {
1542 // ignore all data upto the close bracket '>'
1543 while (true) {
1544 skipSpace();
1545 switch (ch) {
1546 case '>':
1547 case -1:
1548 ch = readCh();
1549 return;
1550 case '<':
1551 return;
1552 default:
1553 ch = readCh();
1554
1555 }
1556 }
1557 }
1558
1559 /**
1560 * Parse a start or end tag.
1561 */
1562 void parseTag() throws IOException {
1563 Element elem;
1564 boolean net = false;
1565 boolean warned = false;
1566 boolean unknown = false;
1567
1568 switch (ch = readCh()) {
1569 case '!':
1570 switch (ch = readCh()) {
1571 case '-':
1572 // Parse comment. [92] 391:7
1573 while (true) {
1574 if (ch == '-') {
1575 if (!strict || ((ch = readCh()) == '-')) {
1576 ch = readCh();
1577 if (!strict && ch == '-') {
1578 ch = readCh();
1579 }
1580 // send over any text you might see
1581 // before parsing and sending the
1582 // comment
1583 if (textpos != 0) {
1584 char newtext[] = new char[textpos];
1585 System.arraycopy(text, 0, newtext, 0, textpos);
1586 handleText(newtext);
1587 lastBlockStartPos = currentBlockStartPos;
1588 textpos = 0;
1589 }
1590 parseComment();
1591 last = makeTag(dtd.getElement("comment"), true);
1592 handleComment(getChars(0));
1593 continue;
1594 } else if (!warned) {
1595 warned = true;
1596 error("invalid.commentchar", "-");
1597 }
1598 }
1599 skipSpace();
1600 switch (ch) {
1601 case '-':
1602 continue;
1603 case '>':
1604 ch = readCh();
1605 case -1:
1606 return;
1607 default:
1608 ch = readCh();
1609 if (!warned) {
1610 warned = true;
1611 error("invalid.commentchar",
1612 String.valueOf((char)ch));
1613 }
1614 break;
1615 }
1616 }
1617
1618 default:
1619 // deal with marked sections
1620 StringBuffer strBuff = new StringBuffer();
1621 while (true) {
1622 strBuff.append((char)ch);
1623 if (parseMarkupDeclarations(strBuff)) {
1624 return;
1625 }
1626 switch(ch) {
1627 case '>':
1628 ch = readCh();
1629 case -1:
1630 error("invalid.markup");
1631 return;
1632 case '\n':
1633 ln++;
1634 ch = readCh();
1635 lfCount++;
1636 break;
1637 case '\r':
1638 ln++;
1639 if ((ch = readCh()) == '\n') {
1640 ch = readCh();
1641 crlfCount++;
1642 }
1643 else {
1644 crCount++;
1645 }
1646 break;
1647
1648 default:
1649 ch = readCh();
1650 break;
1651 }
1652 }
1653 }
1654
1655 case '/':
1656 // parse end tag [19] 317:4
1657 switch (ch = readCh()) {
1658 case '>':
1659 ch = readCh();
1660 case '<':
1661 // empty end tag. either </> or </<
1662 if (recent == null) {
1663 error("invalid.shortend");
1664 return;
1665 }
1666 elem = recent;
1667 break;
1668
1669 default:
1670 if (!parseIdentifier(true)) {
1671 error("expected.endtagname");
1672 return;
1673 }
1674 skipSpace();
1675 switch (ch) {
1676 case '>':
1677 ch = readCh();
1678 case '<':
1679 break;
1680
1681 default:
1682 error("expected", "'>'");
1683 while ((ch != -1) && (ch != '\n') && (ch != '>')) {
1684 ch = readCh();
1685 }
1686 if (ch == '>') {
1687 ch = readCh();
1688 }
1689 break;
1690 }
1691 String elemStr = getString(0);
1692 if (!dtd.elementExists(elemStr)) {
1693 error("end.unrecognized", elemStr);
1694 // Ignore RE before end tag
1695 if ((textpos > 0) && (text[textpos-1] == '\n')) {
1696 textpos--;
1697 }
1698 elem = dtd.getElement("unknown");
1699 elem.name = elemStr;
1700 unknown = true;
1701 } else {
1702 elem = dtd.getElement(elemStr);
1703 }
1704 break;
1705 }
1706
1707
1708 // If the stack is null, we're seeing end tags without any begin
1709 // tags. Ignore them.
1710
1711 if (stack == null) {
1712 error("end.extra.tag", elem.getName());
1713 return;
1714 }
1715
1716 // Ignore RE before end tag
1717 if ((textpos > 0) && (text[textpos-1] == '\n')) {
1718 // In a pre tag, if there are blank lines
1719 // we do not want to remove the newline
1720 // before the end tag. Hence this code.
1721 //
1722 if (stack.pre) {
1723 if ((textpos > 1) && (text[textpos-2] != '\n')) {
1724 textpos--;
1725 }
1726 } else {
1727 textpos--;
1728 }
1729 }
1730
1731 // If the end tag is a form, since we did not put it
1732 // on the tag stack, there is no corresponding start
1733 // start tag to find. Hence do not touch the tag stack.
1734 //
1735
1736 /*
1737 if (!strict && elem.getName().equals("form")) {
1738 if (lastFormSent != null) {
1739 handleEndTag(lastFormSent);
1740 return;
1741 } else {
1742 // do nothing.
1743 return;
1744 }
1745 }
1746 */
1747
1748 if (unknown) {
1749 // we will not see a corresponding start tag
1750 // on the the stack. If we are seeing an
1751 // end tag, lets send this on as an empty
1752 // tag with the end tag attribute set to
1753 // true.
1754 TagElement t = makeTag(elem);
1755 handleText(t);
1756 attributes.addAttribute(HTML.Attribute.ENDTAG, "true");
1757 handleEmptyTag(makeTag(elem));
1758 unknown = false;
1759 return;
1760 }
1761
1762 // find the corresponding start tag
1763
1764 // A commonly occurring error appears to be the insertion
1765 // of extra end tags in a table. The intent here is ignore
1766 // such extra end tags.
1767 //
1768 if (!strict) {
1769 String stackElem = stack.elem.getName();
1770
1771 if (stackElem.equals("table")) {
1772 // If it is not a valid end tag ignore it and return
1773 //
1774 if (!elem.getName().equals(stackElem)) {
1775 error("tag.ignore", elem.getName());
1776 return;
1777 }
1778 }
1779
1780
1781
1782 if (stackElem.equals("tr") ||
1783 stackElem.equals("td")) {
1784 if ((!elem.getName().equals("table")) &&
1785 (!elem.getName().equals(stackElem))) {
1786 error("tag.ignore", elem.getName());
1787 return;
1788 }
1789 }
1790 }
1791 TagStack sp = stack;
1792
1793 while ((sp != null) && (elem != sp.elem)) {
1794 sp = sp.next;
1795 }
1796 if (sp == null) {
1797 error("unmatched.endtag", elem.getName());
1798 return;
1799 }
1800
1801 // People put font ending tags in the darndest places.
1802 // Don't close other contexts based on them being between
1803 // a font tag and the corresponding end tag. Instead,
1804 // ignore the end tag like it doesn't exist and allow the end
1805 // of the document to close us out.
1806 String elemName = elem.getName();
1807 if (stack != sp &&
1808 (elemName.equals("font") ||
1809 elemName.equals("center"))) {
1810
1811 // Since closing out a center tag can have real wierd
1812 // effects on the formatting, make sure that tags
1813 // for which omitting an end tag is legimitate
1814 // get closed out.
1815 //
1816 if (elemName.equals("center")) {
1817 while(stack.elem.omitEnd() && stack != sp) {
1818 endTag(true);
1819 }
1820 if (stack.elem == elem) {
1821 endTag(false);
1822 }
1823 }
1824 return;
1825 }
1826 // People do the same thing with center tags. In this
1827 // case we would like to close off the center tag but
1828 // not necessarily all enclosing tags.
1829
1830
1831
1832 // end tags
1833 while (stack != sp) {
1834 endTag(true);
1835 }
1836
1837 endTag(false);
1838 return;
1839
1840 case -1:
1841 error("eof");
1842 return;
1843 }
1844
1845 // start tag [14] 314:1
1846 if (!parseIdentifier(true)) {
1847 elem = recent;
1848 if ((ch != '>') || (elem == null)) {
1849 error("expected.tagname");
1850 return;
1851 }
1852 } else {
1853 String elemStr = getString(0);
1854
1855 if (elemStr.equals("image")) {
1856 elemStr = "img";
1857 }
1858
1859 /* determine if this element is part of the dtd. */
1860
1861 if (!dtd.elementExists(elemStr)) {
1862 // parseInvalidTag();
1863 error("tag.unrecognized ", elemStr);
1864 elem = dtd.getElement("unknown");
1865 elem.name = elemStr;
1866 unknown = true;
1867 } else {
1868 elem = dtd.getElement(elemStr);
1869 }
1870 }
1871
1872 // Parse attributes
1873 parseAttributeSpecificationList(elem);
1874
1875 switch (ch) {
1876 case '/':
1877 net = true;
1878 case '>':
1879 ch = readCh();
1880 if (ch == '>' && net) {
1881 ch = readCh();
1882 }
1883 case '<':
1884 break;
1885
1886 default:
1887 error("expected", "'>'");
1888 break;
1889 }
1890
1891 if (!strict) {
1892 if (elem.getName().equals("script")) {
1893 error("javascript.unsupported");
1894 }
1895 }
1896
1897 // ignore RE after start tag
1898 //
1899 if (!elem.isEmpty()) {
1900 if (ch == '\n') {
1901 ln++;
1902 lfCount++;
1903 ch = readCh();
1904 } else if (ch == '\r') {
1905 ln++;
1906 if ((ch = readCh()) == '\n') {
1907 ch = readCh();
1908 crlfCount++;
1909 }
1910 else {
1911 crCount++;
1912 }
1913 }
1914 }
1915
1916 // ensure a legal context for the tag
1917 TagElement tag = makeTag(elem, false);
1918
1919
1920 /** In dealing with forms, we have decided to treat
1921 them as legal in any context. Also, even though
1922 they do have a start and an end tag, we will
1923 not put this tag on the stack. This is to deal
1924 several pages in the web oasis that choose to
1925 start and end forms in any possible location. **/
1926
1927 /*
1928 if (!strict && elem.getName().equals("form")) {
1929 if (lastFormSent == null) {
1930 lastFormSent = tag;
1931 } else {
1932 handleEndTag(lastFormSent);
1933 lastFormSent = tag;
1934 }
1935 } else {
1936 */
1937 // Smlly, if a tag is unknown, we will apply
1938 // no legalTagContext logic to it.
1939 //
1940 if (!unknown) {
1941 legalTagContext(tag);
1942
1943 // If skip tag is true, this implies that
1944 // the tag was illegal and that the error
1945 // recovery strategy adopted is to ignore
1946 // the tag.
1947 if (!strict && skipTag) {
1948 skipTag = false;
1949 return;
1950 }
1951 }
1952 /*
1953 }
1954 */
1955
1956 startTag(tag);
1957
1958 if (!elem.isEmpty()) {
1959 switch (elem.getType()) {
1960 case CDATA:
1961 parseLiteral(false);
1962 break;
1963 case RCDATA:
1964 parseLiteral(true);
1965 break;
1966 default:
1967 if (stack != null) {
1968 stack.net = net;
1969 }
1970 break;
1971 }
1972 }
1973 }
1974
1975 private static final String START_COMMENT = "<!--";
1976 private static final String END_COMMENT = "-->";
1977 private static final char[] SCRIPT_END_TAG = "</script>".toCharArray();
1978 private static final char[] SCRIPT_END_TAG_UPPER_CASE =
1979 "</SCRIPT>".toCharArray();
1980
1981 void parseScript() throws IOException {
1982 char[] charsToAdd = new char[SCRIPT_END_TAG.length];
1983 boolean insideComment = false;
1984
1985 /* Here, ch should be the first character after <script> */
1986 while (true) {
1987 int i = 0;
1988 while (!insideComment && i < SCRIPT_END_TAG.length
1989 && (SCRIPT_END_TAG[i] == ch
1990 || SCRIPT_END_TAG_UPPER_CASE[i] == ch)) {
1991 charsToAdd[i] = (char) ch;
1992 ch = readCh();
1993 i++;
1994 }
1995 if (i == SCRIPT_END_TAG.length) {
1996
1997 /* '</script>' tag detected */
1998 /* Here, ch == the first character after </script> */
1999 return;
2000 } else {
2001
2002 /* To account for extra read()'s that happened */
2003 for (int j = 0; j < i; j++) {
2004 addString(charsToAdd[j]);
2005 }
2006
2007 switch (ch) {
2008 case -1:
2009 error("eof.script");
2010 return;
2011 case '\n':
2012 ln++;
2013 ch = readCh();
2014 lfCount++;
2015 addString('\n');
2016 break;
2017 case '\r':
2018 ln++;
2019 if ((ch = readCh()) == '\n') {
2020 ch = readCh();
2021 crlfCount++;
2022 } else {
2023 crCount++;
2024 }
2025 addString('\n');
2026 break;
2027 default:
2028 addString(ch);
2029 String str = new String(getChars(0, strpos));
2030 if (!insideComment && str.endsWith(START_COMMENT)) {
2031 insideComment = true;
2032 }
2033 if (insideComment && str.endsWith(END_COMMENT)) {
2034 insideComment = false;
2035 }
2036 ch = readCh();
2037 break;
2038 } // switch
2039 }
2040 } // while
2041 }
2042
2043 /**
2044 * Parse Content. [24] 320:1
2045 */
2046 void parseContent() throws IOException {
2047 Thread curThread = Thread.currentThread();
2048
2049 for (;;) {
2050 if (curThread.isInterrupted()) {
2051 curThread.interrupt(); // resignal the interrupt
2052 break;
2053 }
2054
2055 int c = ch;
2056 currentBlockStartPos = currentPosition;
2057
2058 if (recent == dtd.script) { // means: if after starting <script> tag
2059
2060 /* Here, ch has to be the first character after <script> */
2061 parseScript();
2062 last = makeTag(dtd.getElement("comment"), true);
2063
2064 /* Remove leading and trailing HTML comment declarations */
2065 String str = new String(getChars(0)).trim();
2066 int minLength = START_COMMENT.length() + END_COMMENT.length();
2067 if (str.startsWith(START_COMMENT) && str.endsWith(END_COMMENT)
2068 && str.length() >= (minLength)) {
2069 str = str.substring(START_COMMENT.length(),
2070 str.length() - END_COMMENT.length());
2071 }
2072
2073 /* Handle resulting chars as comment */
2074 handleComment(str.toCharArray());
2075 endTag(false);
2076 lastBlockStartPos = currentPosition;
2077
2078 continue;
2079 } else {
2080 switch (c) {
2081 case '<':
2082 parseTag();
2083 lastBlockStartPos = currentPosition;
2084 continue;
2085
2086 case '/':
2087 ch = readCh();
2088 if ((stack != null) && stack.net) {
2089 // null end tag.
2090 endTag(false);
2091 continue;
2092 } else if (textpos == 0) {
2093 if (!legalElementContext(dtd.pcdata)) {
2094 error("unexpected.pcdata");
2095 }
2096 if (last.breaksFlow()) {
2097 space = false;
2098 }
2099 }
2100 break;
2101
2102 case -1:
2103 return;
2104
2105 case '&':
2106 if (textpos == 0) {
2107 if (!legalElementContext(dtd.pcdata)) {
2108 error("unexpected.pcdata");
2109 }
2110 if (last.breaksFlow()) {
2111 space = false;
2112 }
2113 }
2114 char data[] = parseEntityReference();
2115 if (textpos + data.length + 1 > text.length) {
2116 char newtext[] = new char[Math.max(textpos + data.length + 128, text.length * 2)];
2117 System.arraycopy(text, 0, newtext, 0, text.length);
2118 text = newtext;
2119 }
2120 if (space) {
2121 space = false;
2122 text[textpos++] = ' ';
2123 }
2124 System.arraycopy(data, 0, text, textpos, data.length);
2125 textpos += data.length;
2126 ignoreSpace = false;
2127 continue;
2128
2129 case '\n':
2130 ln++;
2131 lfCount++;
2132 ch = readCh();
2133 if ((stack != null) && stack.pre) {
2134 break;
2135 }
2136 if (textpos == 0) {
2137 lastBlockStartPos = currentPosition;
2138 }
2139 if (!ignoreSpace) {
2140 space = true;
2141 }
2142 continue;
2143
2144 case '\r':
2145 ln++;
2146 c = '\n';
2147 if ((ch = readCh()) == '\n') {
2148 ch = readCh();
2149 crlfCount++;
2150 }
2151 else {
2152 crCount++;
2153 }
2154 if ((stack != null) && stack.pre) {
2155 break;
2156 }
2157 if (textpos == 0) {
2158 lastBlockStartPos = currentPosition;
2159 }
2160 if (!ignoreSpace) {
2161 space = true;
2162 }
2163 continue;
2164
2165
2166 case '\t':
2167 case ' ':
2168 ch = readCh();
2169 if ((stack != null) && stack.pre) {
2170 break;
2171 }
2172 if (textpos == 0) {
2173 lastBlockStartPos = currentPosition;
2174 }
2175 if (!ignoreSpace) {
2176 space = true;
2177 }
2178 continue;
2179
2180 default:
2181 if (textpos == 0) {
2182 if (!legalElementContext(dtd.pcdata)) {
2183 error("unexpected.pcdata");
2184 }
2185 if (last.breaksFlow()) {
2186 space = false;
2187 }
2188 }
2189 ch = readCh();
2190 break;
2191 }
2192 }
2193
2194 // enlarge buffer if needed
2195 if (textpos + 2 > text.length) {
2196 char newtext[] = new char[text.length + 128];
2197 System.arraycopy(text, 0, newtext, 0, text.length);
2198 text = newtext;
2199 }
2200
2201 // output pending space
2202 if (space) {
2203 if (textpos == 0) {
2204 lastBlockStartPos--;
2205 }
2206 text[textpos++] = ' ';
2207 space = false;
2208 }
2209 text[textpos++] = (char)c;
2210 ignoreSpace = false;
2211 }
2212 }
2213
2214 /**
2215 * Returns the end of line string. This will return the end of line
2216 * string that has been encountered the most, one of \r, \n or \r\n.
2217 */
2218 String getEndOfLineString() {
2219 if (crlfCount >= crCount) {
2220 if (lfCount >= crlfCount) {
2221 return "\n";
2222 }
2223 else {
2224 return "\r\n";
2225 }
2226 }
2227 else {
2228 if (crCount > lfCount) {
2229 return "\r";
2230 }
2231 else {
2232 return "\n";
2233 }
2234 }
2235 }
2236
2237 /**
2238 * Parse an HTML stream, given a DTD.
2239 */
2240 public synchronized void parse(Reader in) throws IOException {
2241 this.in = in;
2242
2243 this.ln = 1;
2244
2245 seenHtml = false;
2246 seenHead = false;
2247 seenBody = false;
2248
2249 crCount = lfCount = crlfCount = 0;
2250
2251 try {
2252 ch = readCh();
2253 text = new char[1024];
2254 str = new char[128];
2255
2256 parseContent();
2257 // NOTE: interruption may have occurred. Control flows out
2258 // of here normally.
2259 while (stack != null) {
2260 endTag(true);
2261 }
2262 in.close();
2263 } catch (IOException e) {
2264 errorContext();
2265 error("ioexception");
2266 throw e;
2267 } catch (Exception e) {
2268 errorContext();
2269 error("exception", e.getClass().getName(), e.getMessage());
2270 e.printStackTrace();
2271 } catch (ThreadDeath e) {
2272 errorContext();
2273 error("terminated");
2274 e.printStackTrace();
2275 throw e;
2276 } finally {
2277 for (; stack != null ; stack = stack.next) {
2278 handleEndTag(stack.tag);
2279 }
2280
2281 text = null;
2282 str = null;
2283 }
2284
2285 }
2286
2287
2288 /*
2289 * Input cache. This is much faster than calling down to a synchronized
2290 * method of BufferedReader for each byte. Measurements done 5/30/97
2291 * show that there's no point in having a bigger buffer: Increasing
2292 * the buffer to 8192 had no measurable impact for a program discarding
2293 * one character at a time (reading from an http URL to a local machine).
2294 * NOTE: If the current encoding is bogus, and we read too much
2295 * (past the content-type) we may suffer a MalformedInputException. For
2296 * this reason the initial size is 1 and when the body is encountered the
2297 * size is adjusted to 256.
2298 */
2299 private char buf[] = new char[1];
2300 private int pos;
2301 private int len;
2302 /*
2303 tracks position relative to the beginning of the
2304 document.
2305 */
2306 private int currentPosition;
2307
2308
2309 private final int readCh() throws IOException {
2310
2311 if (pos >= len) {
2312
2313 // This loop allows us to ignore interrupts if the flag
2314 // says so
2315 for (;;) {
2316 try {
2317 len = in.read(buf);
2318 break;
2319 } catch (InterruptedIOException ex) {
2320 throw ex;
2321 }
2322 }
2323
2324 if (len <= 0) {
2325 return -1; // eof
2326 }
2327 pos = 0;
2328 }
2329 ++currentPosition;
2330
2331 return buf[pos++];
2332 }
2333
2334
2335 protected int getCurrentPos() {
2336 return currentPosition;
2337 }
2338 }