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   1 /*
   2  * Copyright (c) 2002-2004 Widespace, OU and others.
   3  * All rights reserved. This program and the accompanying materials
   4  * are made available under the terms of the Common Public License v1.0
   5  * which accompanies this distribution, and is available at
   6  * http://www.eclipse.org/legal/cpl-v10.html
   7  *
   8  * Contributors:
   9  *     Igor Malinin - initial contribution
  10  *
  11  * $Id: XMLPartitionScanner.java,v 1.1 2004-09-02 18:28:03 jsurfer Exp $
  12  */
  13
  14 package net.sourceforge.phpeclipse.xml.ui.internal.text;
  15
  16 import java.util.HashMap;
  17 import java.util.Map;
  18
  19 import org.eclipse.jface.text.Assert;
  20 import org.eclipse.jface.text.BadLocationException;
  21 import org.eclipse.jface.text.IDocument;
  22 import org.eclipse.jface.text.rules.ICharacterScanner;
  23 import org.eclipse.jface.text.rules.IPartitionTokenScanner;
  24 import org.eclipse.jface.text.rules.IToken;
  25 import org.eclipse.jface.text.rules.Token;
  26
  27
  28 /**
  29  *
  30  *
  31  * @author Igor Malinin
  32  */
  33 public class XMLPartitionScanner implements IPartitionTokenScanner {
  34         public static final String XML_PI         = "__xml_processing_instruction";
  35         public static final String XML_COMMENT    = "__xml_comment";
  36         public static final String XML_DECL       = "__xml_declaration";
  37         public static final String XML_TAG        = "__xml_tag";
  38         public static final String XML_ATTRIBUTE  = "__xml_attribute";
  39         public static final String XML_CDATA      = "__xml_cdata";
  40
  41         public static final String DTD_INTERNAL         = "__dtd_internal";
  42         public static final String DTD_INTERNAL_PI      = "__dtd_internal_pi";
  43         public static final String DTD_INTERNAL_COMMENT = "__dtd_internal_comment";
  44         public static final String DTD_INTERNAL_DECL    = "__dtd_internal_declaration";
  45         public static final String DTD_CONDITIONAL      = "__dtd_conditional";
  46
  47         public static final int STATE_DEFAULT     = 0;
  48         public static final int STATE_TAG         = 1;
  49         public static final int STATE_DECL        = 2;
  50         public static final int STATE_CDATA       = 4;
  51
  52         public static final int STATE_INTERNAL    = 8;
  53
  54         protected IDocument document;
  55         protected int end;
  56
  57         protected int offset;
  58         protected int length;
  59
  60         protected int position;
  61         protected int state;
  62
  63         protected boolean parsedtd;
  64
  65         protected Map tokens = new HashMap();
  66
  67         public XMLPartitionScanner(boolean parsedtd) {
  68                 this.parsedtd = parsedtd;
  69         }
  70
  71         /*
  72          * @see org.eclipse.jface.text.rules.ITokenScanner#nextToken()
  73          */
  74         public IToken nextToken() {
  75                 offset += length;
  76
  77                 switch (state) {
  78                         case STATE_TAG:
  79                                 return nextTagToken();
  80
  81                         case STATE_DECL:
  82                                 return nextDeclToken();
  83
  84                         case STATE_CDATA:
  85                                 return nextCDATAToken();
  86                 }
  87
  88                 switch (read()) {
  89                         case ICharacterScanner.EOF:
  90                                 state = STATE_DEFAULT;
  91                                 return getToken(null);
  92
  93                         case '<':
  94                                 switch (read()) {
  95                                         case ICharacterScanner.EOF:
  96                                                 if (parsedtd || isInternal()) {
  97                                                         break;
  98                                                 }
  99
 100                                                 state = STATE_DEFAULT;
 101                                                 return getToken(XML_TAG);
 102
 103                                         case '?': // <?  <?PI
 104                                                 return nextPIToken();
 105
 106                                         case '!': // <!  <!DEFINITION or <![CDATA[ or <!--COMMENT
 107                                                 switch (read()) {
 108                                                         case ICharacterScanner.EOF:
 109                                                                 state = STATE_DEFAULT;
 110                                                                 return getToken(XML_TAG);
 111
 112                                                         case '-': // <!-  <!--COMMENT
 113                                                                 switch (read()) {
 114                                                                         case ICharacterScanner.EOF:
 115                                                                                 return nextDeclToken();
 116
 117                                                                         case '-': // <!--
 118                                                                                 return nextCommentToken();
 119                                                                 }
 120
 121                                                         case '[': // <![  <![CDATA[ or <![%cond;[
 122                                                                 if (parsedtd) {
 123                                                                         return nextConditionalToken();
 124                                                                 }
 125
 126                                                                 if (!isInternal()) {
 127                                                                         return nextCDATAToken();
 128                                                                 }
 129                                                 }
 130
 131                                                 return nextDeclToken();
 132                                 }
 133
 134                                 if (parsedtd || isInternal()) {
 135                                         break;
 136                                 }
 137
 138                                 unread();
 139
 140                                 return nextTagToken();
 141
 142                         case ']':
 143                                 if (isInternal()) {
 144                                         unread();
 145
 146                                         state = STATE_DECL;
 147                                         length = 0;
 148                                         return nextToken();
 149                                 }
 150                 }
 151
 152 loop:
 153                 while (true) {
 154                         switch (read()) {
 155                                 case ICharacterScanner.EOF:
 156                                         state = STATE_DEFAULT;
 157                                         return getToken(null);
 158
 159                                 case '<':
 160                                         if (parsedtd || isInternal()) {
 161                                                 switch (read()) {
 162                                                         case ICharacterScanner.EOF:
 163                                                                 state = STATE_DEFAULT;
 164                                                                 return getToken(null);
 165
 166                                                         case '!':
 167                                                         case '?':
 168                                                                 unread();
 169                                                                 break;
 170
 171                                                         default:
 172                                                                 continue loop;
 173                                                 }
 174                                         }
 175
 176                                         unread();
 177
 178                                         state &= STATE_INTERNAL;
 179                                         return getToken(isInternal() ? DTD_INTERNAL : null);
 180
 181                                 case ']':
 182                                         if (isInternal()) {
 183                                                 unread();
 184
 185                                                 state = STATE_DECL;
 186                                                 if (position == offset) {
 187                                                         // nothing between
 188                                                         length = 0;
 189                                                         return nextToken();
 190                                                 }
 191
 192                                                 return getToken(DTD_INTERNAL);
 193                                         }
 194                         }
 195                 }
 196         }
 197
 198         private IToken nextTagToken() {
 199                 int quot = read();
 200
 201                 switch (quot) {
 202                         case ICharacterScanner.EOF:
 203                         case '>':
 204                                 state = STATE_DEFAULT;
 205                                 return getToken(XML_TAG);
 206
 207                         case '"': case '\'':
 208                                 while (true) {
 209                                         int ch = read();
 210
 211                                         if (ch == quot) {
 212                                                 state = STATE_TAG;
 213                                                 return getToken(XML_ATTRIBUTE);
 214                                         }
 215
 216                                         switch (ch) {
 217                                                 case '<':
 218                                                         unread();
 219
 220                                                 case ICharacterScanner.EOF:
 221                                                         state = STATE_DEFAULT;
 222                                                         return getToken(XML_ATTRIBUTE);
 223                                         }
 224                                 }
 225                 }
 226
 227                 while (true) {
 228                         switch (read()) {
 229                                 case '<':
 230                                         unread();
 231
 232                                 case ICharacterScanner.EOF:
 233                                 case '>':
 234                                         state = STATE_DEFAULT;
 235                                         return getToken(XML_TAG);
 236
 237                                 case '"': case '\'':
 238                                         unread();
 239
 240                                         state = STATE_TAG;
 241                                         return getToken(XML_TAG);
 242                         }
 243                 }
 244         }
 245
 246         private IToken nextDeclToken() {
 247                 loop: while (true) {
 248                         switch (read()) {
 249                                 case ICharacterScanner.EOF:
 250                                         state = STATE_DEFAULT;
 251                                         return getToken(isInternal() ? DTD_INTERNAL_DECL : XML_DECL);
 252
 253                                 case '<':
 254                                         if (parsedtd || isInternal()) {
 255                                                 switch (read()) {
 256                                                         case ICharacterScanner.EOF:
 257                                                                 state = STATE_DEFAULT;
 258                                                                 return getToken(isInternal() ? DTD_INTERNAL : null);
 259
 260                                                         case '!':
 261                                                         case '?':
 262                                                                 unread();
 263                                                                 break;
 264
 265                                                         default:
 266                                                                 continue loop;
 267                                                 }
 268                                         }
 269
 270                                         unread();
 271
 272                                 case '>':
 273                                         state &= STATE_INTERNAL;
 274                                         return getToken(isInternal() ? DTD_INTERNAL_DECL : XML_DECL);
 275
 276                                 case '[': // <!DOCTYPE xxx [dtd]>
 277                                         if (!isInternal()) {
 278                                                 state = STATE_INTERNAL;
 279                                                 return getToken(XML_DECL);
 280                                         }
 281                         }
 282                 }
 283         }
 284
 285         private IToken nextCommentToken() {
 286                 state &= STATE_INTERNAL;
 287
 288                 loop: while (true) {
 289                         switch (read()) {
 290                                 case ICharacterScanner.EOF:
 291                                         break loop;
 292
 293                                 case '-': // -  -->
 294                                         switch (read()) {
 295                                                 case ICharacterScanner.EOF:
 296                                                         break loop;
 297
 298                                                 case '-': // --  -->
 299                                                         switch (read()) {
 300                                                                 case ICharacterScanner.EOF:
 301                                                                 case '>':
 302                                                                         break loop;
 303                                                         }
 304
 305                                                         unread();
 306                                                         break loop;
 307                                         }
 308                         }
 309                 }
 310
 311                 return getToken(isInternal() ? DTD_INTERNAL_COMMENT : XML_COMMENT);
 312         }
 313
 314         private IToken nextPIToken() {
 315                 state &= STATE_INTERNAL;
 316
 317                 loop: while (true) {
 318                         switch (read()) {
 319                                 case ICharacterScanner.EOF:
 320                                         break loop;
 321
 322                                 case '?': // ?  ?>
 323                                         switch (read()) {
 324                                                 case ICharacterScanner.EOF:
 325                                                 case '>':
 326                                                         break loop;
 327                                         }
 328
 329                                         unread();
 330                         }
 331                 }
 332
 333                 return getToken(isInternal() ? DTD_INTERNAL_PI : XML_PI);
 334         }
 335
 336         private IToken nextCDATAToken() {
 337                 state = STATE_DEFAULT;
 338
 339 loop:
 340         while (true) {
 341                         switch (read()) {
 342                                 case ICharacterScanner.EOF:
 343                                         break loop;
 344
 345                                 case ']': // ]  ]]>
 346                                         switch (read()) {
 347                                                 case ICharacterScanner.EOF:
 348                                                         break loop;
 349
 350                                                 case ']': // ]]  ]]>
 351                                                         switch (read()) {
 352                                                                 case ICharacterScanner.EOF:
 353                                                                 case '>': // ]]>
 354                                                                         break loop;
 355                                                         }
 356
 357                                                         unread();
 358                                                         unread();
 359                                                         continue loop;
 360                                         }
 361                         }
 362                 }
 363
 364                 return getToken(XML_CDATA);
 365         }
 366
 367         private IToken nextConditionalToken() {
 368                 state = STATE_DEFAULT;
 369
 370                 int level = 1;
 371
 372 loop:
 373         while (true) {
 374                         switch (read()) {
 375                                 case ICharacterScanner.EOF:
 376                                         break loop;
 377
 378                                 case '<': // -  -->
 379                                         switch (read()) {
 380                                                 case ICharacterScanner.EOF:
 381                                                         break loop;
 382
 383                                                 case '!': // --  -->
 384                                                         switch (read()) {
 385                                                                 case ICharacterScanner.EOF:
 386                                                                         break loop;
 387
 388                                                                 case '[':
 389                                                                         ++level;
 390                                                                         continue loop;
 391                                                         }
 392
 393                                                         unread();
 394                                                         continue loop;
 395                                         }
 396
 397                                         unread();
 398                                         continue loop;
 399
 400                                 case ']': // -  -->
 401                                         switch (read()) {
 402                                                 case ICharacterScanner.EOF:
 403                                                         break loop;
 404
 405                                                 case ']': // --  -->
 406                                                         switch (read()) {
 407                                                                 case ICharacterScanner.EOF:
 408                                                                 case '>':
 409                                                                         if (--level == 0) {
 410                                                                                 break loop;
 411                                                                         }
 412
 413                                                                         continue loop;
 414                                                         }
 415
 416                                                         unread();
 417                                                         unread();
 418                                                         continue loop;
 419                                         }
 420                         }
 421                 }
 422
 423                 return getToken(DTD_CONDITIONAL);
 424         }
 425
 426         private IToken getToken(String type) {
 427                 length = position - offset;
 428
 429                 if (length == 0) {
 430                         return Token.EOF;
 431                 }
 432
 433                 if (type == null) {
 434                         return Token.UNDEFINED;
 435                 }
 436
 437                 IToken token = (IToken) tokens.get(type);
 438                 if (token == null) {
 439                         token = new Token(type);
 440                         tokens.put(type, token);
 441                 }
 442
 443                 return token;
 444         }
 445
 446         private boolean isInternal() {
 447                 return (state & STATE_INTERNAL) != 0;
 448         }
 449
 450         private int read() {
 451                 if (position >= end) {
 452                         return ICharacterScanner.EOF;
 453                 }
 454
 455                 try {
 456                         return document.getChar(position++);
 457                 } catch (BadLocationException e) {
 458                         --position;
 459                         return ICharacterScanner.EOF;
 460                 }
 461         }
 462
 463         private void unread() {
 464                 --position;
 465         }
 466
 467         /*
 468          * @see org.eclipse.jface.text.rules.ITokenScanner#getTokenOffset()
 469          */
 470         public int getTokenOffset() {
 471           Assert.isTrue(offset>=0, Integer.toString(offset));
 472                 return offset;
 473         }
 474
 475         /*
 476          * @see org.eclipse.jface.text.rules.ITokenScanner#getTokenLength()
 477          */
 478         public int getTokenLength() {
 479                 return length;
 480         }
 481
 482         /*
 483          * @see org.eclipse.jface.text.rules.ITokenScanner#setRange(IDocument, int, int)
 484          */
 485         public void setRange(IDocument document, int offset, int length) {
 486                 this.document = document;
 487                 this.end = offset + length;
 488
 489                 this.offset = offset;
 490                 this.position = offset;
 491                 this.length = 0;
 492
 493                 this.state = STATE_DEFAULT;
 494         }
 495
 496         /*
 497          * @see org.eclipse.jface.text.rules.IPartitionTokenScanner
 498          */
 499         public void setPartialRange(
 500                 IDocument document, int offset, int length,
 501                 String contentType, int partitionOffset
 502         ) {
 503                 this.document = document;
 504                 this.end = offset + length;
 505
 506                 // NB! Undocumented value: -1
 507                 if (partitionOffset >= 0) {
 508                         offset = partitionOffset;
 509                 }
 510
 511                 this.offset = offset;
 512                 this.position = offset;
 513                 this.length = 0;
 514
 515                 if (contentType == XML_ATTRIBUTE) {
 516                         state = STATE_TAG;
 517                         return;
 518                 }
 519
 520                 if (contentType == XML_TAG) {
 521                         state = isContinuationPartition() ? STATE_TAG : STATE_DEFAULT;
 522                         return;
 523                 }
 524
 525                 if (contentType == XML_DECL) {
 526                         state = isContinuationPartition() ? STATE_DECL : STATE_DEFAULT;
 527                         return;
 528                 }
 529
 530                 if (contentType == DTD_INTERNAL ||
 531                         contentType == DTD_INTERNAL_PI ||
 532                         contentType == DTD_INTERNAL_DECL ||
 533                         contentType == DTD_INTERNAL_COMMENT
 534                 ) {
 535                         state = STATE_INTERNAL;
 536                         return;
 537                 }
 538
 539                 state = STATE_DEFAULT;
 540         }
 541
 542         private boolean isContinuationPartition() {
 543                 try {
 544                         String type = document.getContentType(offset - 1);
 545
 546                         if (type != IDocument.DEFAULT_CONTENT_TYPE) {
 547                                 return true;
 548                         }
 549                 } catch (BadLocationException e) {}
 550
 551                 return false;
 552         }
 553 }