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1
7 package com.ibm.icu.text;
8
9 import java.util.Hashtable  ;
10
11
12
276 public class RuleBasedTransliterator extends Transliterator {
277
278 private Data data;
279
280 private static final String COPYRIGHT =
281 "\u00A9 IBM Corporation 1999. All rights reserved.";
282
283
292 public RuleBasedTransliterator(String ID, String rules, int direction,
293 UnicodeFilter filter) {
294 super(ID, filter);
295 if (direction != FORWARD && direction != REVERSE) {
296 throw new IllegalArgumentException ("Invalid direction");
297 }
298
299 TransliteratorParser parser = new TransliteratorParser();
300 parser.parse(rules, direction);
301 if (parser.idBlockVector.size() != 0 ||
302 parser.compoundFilter != null) {
303 throw new IllegalArgumentException ("::ID blocks illegal in RuleBasedTransliterator constructor");
304 }
305
306 data = (Data)parser.dataVector.get(0);
307 setMaximumContextLength(data.ruleSet.getMaximumContextLength());
308 }
309
310
319 public RuleBasedTransliterator(String ID, String rules) {
320 this(ID, rules, FORWARD, null);
321 }
322
323 RuleBasedTransliterator(String ID, Data data, UnicodeFilter filter) {
324 super(ID, filter);
325 this.data = data;
326 setMaximumContextLength(data.ruleSet.getMaximumContextLength());
327 }
328
329
334 protected synchronized void handleTransliterate(Replaceable text,
335 Position index, boolean incremental) {
336
350
351
360 int loopCount = 0;
361 int loopLimit = (index.limit - index.start) << 4;
362 if (loopLimit < 0) {
363 loopLimit = 0x7FFFFFFF;
364 }
365
366 while (index.start < index.limit &&
367 loopCount <= loopLimit &&
368 data.ruleSet.transliterate(text, index, incremental)) {
369 ++loopCount;
370 }
371 }
372
373
374 static class Data {
375 public Data() {
376 variableNames = new Hashtable ();
377 ruleSet = new TransliterationRuleSet();
378 }
379
380
383 public TransliterationRuleSet ruleSet;
384
385
394 Hashtable variableNames;
395
396
405 Object [] variables;
406
407
412 char variablesBase;
413
414
418 public UnicodeMatcher lookupMatcher(int standIn) {
419 int i = standIn - variablesBase;
420 return (i >= 0 && i < variables.length)
421 ? (UnicodeMatcher) variables[i] : null;
422 }
423
424
428 public UnicodeReplacer lookupReplacer(int standIn) {
429 int i = standIn - variablesBase;
430 return (i >= 0 && i < variables.length)
431 ? (UnicodeReplacer) variables[i] : null;
432 }
433 }
434
435
436
448 public String toRules(boolean escapeUnprintable) {
449 return data.ruleSet.toRules(escapeUnprintable);
450 }
451
452
458 protected UnicodeSet handleGetSourceSet() {
459 return data.ruleSet.getSourceTargetSet(false);
460 }
461
462
468 public UnicodeSet getTargetSet() {
469 return data.ruleSet.getSourceTargetSet(true);
470 }
471 }
472
473
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