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1 /*
2 ***************************************************************************
3 * Copyright (C) 1999-2013, International Business Machines Corporation
4 * and others. All Rights Reserved.
5 ***************************************************************************
6 * Date Name Description
7 * 10/20/99 alan Creation.
8 ***************************************************************************
9 */
10
11 #ifndef UNICODESET_H
12 #define UNICODESET_H
13
14 #include "unicode/unifilt.h"
15 #include "unicode/unistr.h"
16 #include "unicode/uset.h"
17
18 /**
19 * \file
20 * \brief C++ API: Unicode Set
21 */
22
23 U_NAMESPACE_BEGIN
24
25 // Forward Declarations.
26 void UnicodeSet_initInclusion(int32_t src, UErrorCode &status); /**< @internal */
27
28 class BMPSet;
29 class ParsePosition;
30 class RBBIRuleScanner;
31 class SymbolTable;
32 class UnicodeSetStringSpan;
33 class UVector;
34 class RuleCharacterIterator;
35
36 /**
37 * A mutable set of Unicode characters and multicharacter strings. Objects of this class
38 * represent <em>character classes</em> used in regular expressions.
39 * A character specifies a subset of Unicode code points. Legal
40 * code points are U+0000 to U+10FFFF, inclusive.
41 *
42 * <p>The UnicodeSet class is not designed to be subclassed.
43 *
44 * <p><code>UnicodeSet</code> supports two APIs. The first is the
45 * <em>operand</em> API that allows the caller to modify the value of
46 * a <code>UnicodeSet</code> object. It conforms to Java 2's
47 * <code>java.util.Set</code> interface, although
48 * <code>UnicodeSet</code> does not actually implement that
49 * interface. All methods of <code>Set</code> are supported, with the
50 * modification that they take a character range or single character
51 * instead of an <code>Object</code>, and they take a
52 * <code>UnicodeSet</code> instead of a <code>Collection</code>. The
53 * operand API may be thought of in terms of boolean logic: a boolean
54 * OR is implemented by <code>add</code>, a boolean AND is implemented
55 * by <code>retain</code>, a boolean XOR is implemented by
56 * <code>complement</code> taking an argument, and a boolean NOT is
57 * implemented by <code>complement</code> with no argument. In terms
58 * of traditional set theory function names, <code>add</code> is a
59 * union, <code>retain</code> is an intersection, <code>remove</code>
60 * is an asymmetric difference, and <code>complement</code> with no
61 * argument is a set complement with respect to the superset range
62 * <code>MIN_VALUE-MAX_VALUE</code>
63 *
64 * <p>The second API is the
65 * <code>applyPattern()</code>/<code>toPattern()</code> API from the
66 * <code>java.text.Format</code>-derived classes. Unlike the
67 * methods that add characters, add categories, and control the logic
68 * of the set, the method <code>applyPattern()</code> sets all
69 * attributes of a <code>UnicodeSet</code> at once, based on a
70 * string pattern.
71 *
72 * <p><b>Pattern syntax</b></p>
73 *
74 * Patterns are accepted by the constructors and the
75 * <code>applyPattern()</code> methods and returned by the
76 * <code>toPattern()</code> method. These patterns follow a syntax
77 * similar to that employed by version 8 regular expression character
78 * classes. Here are some simple examples:
79 *
80 * \htmlonly<blockquote>\endhtmlonly
81 * <table>
82 * <tr align="top">
83 * <td nowrap valign="top" align="left"><code>[]</code></td>
84 * <td valign="top">No characters</td>
85 * </tr><tr align="top">
86 * <td nowrap valign="top" align="left"><code>[a]</code></td>
87 * <td valign="top">The character 'a'</td>
88 * </tr><tr align="top">
89 * <td nowrap valign="top" align="left"><code>[ae]</code></td>
90 * <td valign="top">The characters 'a' and 'e'</td>
91 * </tr>
92 * <tr>
93 * <td nowrap valign="top" align="left"><code>[a-e]</code></td>
94 * <td valign="top">The characters 'a' through 'e' inclusive, in Unicode code
95 * point order</td>
96 * </tr>
97 * <tr>
98 * <td nowrap valign="top" align="left"><code>[\\u4E01]</code></td>
99 * <td valign="top">The character U+4E01</td>
100 * </tr>
101 * <tr>
102 * <td nowrap valign="top" align="left"><code>[a{ab}{ac}]</code></td>
103 * <td valign="top">The character 'a' and the multicharacter strings &quot;ab&quot; and
104 * &quot;ac&quot;</td>
105 * </tr>
106 * <tr>
107 * <td nowrap valign="top" align="left"><code>[\\p{Lu}]</code></td>
108 * <td valign="top">All characters in the general category Uppercase Letter</td>
109 * </tr>
110 * </table>
111 * \htmlonly</blockquote>\endhtmlonly
112 *
113 * Any character may be preceded by a backslash in order to remove any special
114 * meaning. White space characters, as defined by UCharacter.isWhitespace(), are
115 * ignored, unless they are escaped.
116 *
117 * <p>Property patterns specify a set of characters having a certain
118 * property as defined by the Unicode standard. Both the POSIX-like
119 * "[:Lu:]" and the Perl-like syntax "\\p{Lu}" are recognized. For a
120 * complete list of supported property patterns, see the User's Guide
121 * for UnicodeSet at
122 * <a href="http://icu-project.org/userguide/unicodeSet.html">
123 * http://icu-project.org/userguide/unicodeSet.html</a>.
124 * Actual determination of property data is defined by the underlying
125 * Unicode database as implemented by UCharacter.
126 *
127 * <p>Patterns specify individual characters, ranges of characters, and
128 * Unicode property sets. When elements are concatenated, they
129 * specify their union. To complement a set, place a '^' immediately
130 * after the opening '['. Property patterns are inverted by modifying
131 * their delimiters; "[:^foo]" and "\\P{foo}". In any other location,
132 * '^' has no special meaning.
133 *
134 * <p>Ranges are indicated by placing two a '-' between two
135 * characters, as in "a-z". This specifies the range of all
136 * characters from the left to the right, in Unicode order. If the
137 * left character is greater than or equal to the
138 * right character it is a syntax error. If a '-' occurs as the first
139 * character after the opening '[' or '[^', or if it occurs as the
140 * last character before the closing ']', then it is taken as a
141 * literal. Thus "[a\-b]", "[-ab]", and "[ab-]" all indicate the same
142 * set of three characters, 'a', 'b', and '-'.
143 *
144 * <p>Sets may be intersected using the '&' operator or the asymmetric
145 * set difference may be taken using the '-' operator, for example,
146 * "[[:L:]&[\\u0000-\\u0FFF]]" indicates the set of all Unicode letters
147 * with values less than 4096. Operators ('&' and '|') have equal
148 * precedence and bind left-to-right. Thus
149 * "[[:L:]-[a-z]-[\\u0100-\\u01FF]]" is equivalent to
150 * "[[[:L:]-[a-z]]-[\\u0100-\\u01FF]]". This only really matters for
151 * difference; intersection is commutative.
152 *
153 * <table>
154 * <tr valign=top><td nowrap><code>[a]</code><td>The set containing 'a'
155 * <tr valign=top><td nowrap><code>[a-z]</code><td>The set containing 'a'
156 * through 'z' and all letters in between, in Unicode order
157 * <tr valign=top><td nowrap><code>[^a-z]</code><td>The set containing
158 * all characters but 'a' through 'z',
159 * that is, U+0000 through 'a'-1 and 'z'+1 through U+10FFFF
160 * <tr valign=top><td nowrap><code>[[<em>pat1</em>][<em>pat2</em>]]</code>
161 * <td>The union of sets specified by <em>pat1</em> and <em>pat2</em>
162 * <tr valign=top><td nowrap><code>[[<em>pat1</em>]&[<em>pat2</em>]]</code>
163 * <td>The intersection of sets specified by <em>pat1</em> and <em>pat2</em>
164 * <tr valign=top><td nowrap><code>[[<em>pat1</em>]-[<em>pat2</em>]]</code>
165 * <td>The asymmetric difference of sets specified by <em>pat1</em> and
166 * <em>pat2</em>
167 * <tr valign=top><td nowrap><code>[:Lu:] or \\p{Lu}</code>
168 * <td>The set of characters having the specified
169 * Unicode property; in
170 * this case, Unicode uppercase letters
171 * <tr valign=top><td nowrap><code>[:^Lu:] or \\P{Lu}</code>
172 * <td>The set of characters <em>not</em> having the given
173 * Unicode property
174 * </table>
175 *
176 * <p><b>Warning</b>: you cannot add an empty string ("") to a UnicodeSet.</p>
177 *
178 * <p><b>Formal syntax</b></p>
179 *
180 * \htmlonly<blockquote>\endhtmlonly
181 * <table>
182 * <tr align="top">
183 * <td nowrap valign="top" align="right"><code>pattern :=&nbsp; </code></td>
184 * <td valign="top"><code>('[' '^'? item* ']') |
185 * property</code></td>
186 * </tr>
187 * <tr align="top">
188 * <td nowrap valign="top" align="right"><code>item :=&nbsp; </code></td>
189 * <td valign="top"><code>char | (char '-' char) | pattern-expr<br>
190 * </code></td>
191 * </tr>
192 * <tr align="top">
193 * <td nowrap valign="top" align="right"><code>pattern-expr :=&nbsp; </code></td>
194 * <td valign="top"><code>pattern | pattern-expr pattern |
195 * pattern-expr op pattern<br>
196 * </code></td>
197 * </tr>
198 * <tr align="top">
199 * <td nowrap valign="top" align="right"><code>op :=&nbsp; </code></td>
200 * <td valign="top"><code>'&amp;' | '-'<br>
201 * </code></td>
202 * </tr>
203 * <tr align="top">
204 * <td nowrap valign="top" align="right"><code>special :=&nbsp; </code></td>
205 * <td valign="top"><code>'[' | ']' | '-'<br>
206 * </code></td>
207 * </tr>
208 * <tr align="top">
209 * <td nowrap valign="top" align="right"><code>char :=&nbsp; </code></td>
210 * <td valign="top"><em>any character that is not</em><code> special<br>
211 * | ('\' </code><em>any character</em><code>)<br>
212 * | ('\\u' hex hex hex hex)<br>
213 * </code></td>
214 * </tr>
215 * <tr align="top">
216 * <td nowrap valign="top" align="right"><code>hex :=&nbsp; </code></td>
217 * <td valign="top"><em>any character for which
218 * </em><code>Character.digit(c, 16)</code><em>
219 * returns a non-negative result</em></td>
220 * </tr>
221 * <tr>
222 * <td nowrap valign="top" align="right"><code>property :=&nbsp; </code></td>
223 * <td valign="top"><em>a Unicode property set pattern</em></td>
224 * </tr>
225 * </table>
226 * <br>
227 * <table border="1">
228 * <tr>
229 * <td>Legend: <table>
230 * <tr>
231 * <td nowrap valign="top"><code>a := b</code></td>
232 * <td width="20" valign="top">&nbsp; </td>
233 * <td valign="top"><code>a</code> may be replaced by <code>b</code> </td>
234 * </tr>
235 * <tr>
236 * <td nowrap valign="top"><code>a?</code></td>
237 * <td valign="top"></td>
238 * <td valign="top">zero or one instance of <code>a</code><br>
239 * </td>
240 * </tr>
241 * <tr>
242 * <td nowrap valign="top"><code>a*</code></td>
243 * <td valign="top"></td>
244 * <td valign="top">one or more instances of <code>a</code><br>
245 * </td>
246 * </tr>
247 * <tr>
248 * <td nowrap valign="top"><code>a | b</code></td>
249 * <td valign="top"></td>
250 * <td valign="top">either <code>a</code> or <code>b</code><br>
251 * </td>
252 * </tr>
253 * <tr>
254 * <td nowrap valign="top"><code>'a'</code></td>
255 * <td valign="top"></td>
256 * <td valign="top">the literal string between the quotes </td>
257 * </tr>
258 * </table>
259 * </td>
260 * </tr>
261 * </table>
262 * \htmlonly</blockquote>\endhtmlonly
263 *
264 * <p>Note:
265 * - Most UnicodeSet methods do not take a UErrorCode parameter because
266 * there are usually very few opportunities for failure other than a shortage
267 * of memory, error codes in low-level C++ string methods would be inconvenient,
268 * and the error code as the last parameter (ICU convention) would prevent
269 * the use of default parameter values.
270 * Instead, such methods set the UnicodeSet into a "bogus" state
271 * (see isBogus()) if an error occurs.
272 *
273 * @author Alan Liu
274 * @stable ICU 2.0
275 */
276 class U_COMMON_API UnicodeSet : public UnicodeFilter {
277
278 int32_t len; // length of list used; 0 <= len <= capacity
279 int32_t capacity; // capacity of list
280 UChar32* list; // MUST be terminated with HIGH
281 BMPSet *bmpSet; // The set is frozen iff either bmpSet or stringSpan is not NULL.
282 UChar32* buffer; // internal buffer, may be NULL
283 int32_t bufferCapacity; // capacity of buffer
284 int32_t patLen;
285
286 /**
287 * The pattern representation of this set. This may not be the
288 * most economical pattern. It is the pattern supplied to
289 * applyPattern(), with variables substituted and whitespace
290 * removed. For sets constructed without applyPattern(), or
291 * modified using the non-pattern API, this string will be empty,
292 * indicating that toPattern() must generate a pattern
293 * representation from the inversion list.
294 */
295 UChar *pat;
296 UVector* strings; // maintained in sorted order
297 UnicodeSetStringSpan *stringSpan;
298
299 private:
300 enum { // constants
301 kIsBogus = 1 // This set is bogus (i.e. not valid)
302 };
303 uint8_t fFlags; // Bit flag (see constants above)
304 public:
305 /**
306 * Determine if this object contains a valid set.
307 * A bogus set has no value. It is different from an empty set.
308 * It can be used to indicate that no set value is available.
309 *
310 * @return TRUE if the set is valid, FALSE otherwise
311 * @see setToBogus()
312 * @stable ICU 4.0
313 */
314 inline UBool isBogus(void) const;
315
316 /**
317 * Make this UnicodeSet object invalid.
318 * The string will test TRUE with isBogus().
319 *
320 * A bogus set has no value. It is different from an empty set.
321 * It can be used to indicate that no set value is available.
322 *
323 * This utility function is used throughout the UnicodeSet
324 * implementation to indicate that a UnicodeSet operation failed,
325 * and may be used in other functions,
326 * especially but not exclusively when such functions do not
327 * take a UErrorCode for simplicity.
328 *
329 * @see isBogus()
330 * @stable ICU 4.0
331 */
332 void setToBogus();
333
334 public:
335
336 enum {
337 /**
338 * Minimum value that can be stored in a UnicodeSet.
339 * @stable ICU 2.4
340 */
341 MIN_VALUE = 0,
342
343 /**
344 * Maximum value that can be stored in a UnicodeSet.
345 * @stable ICU 2.4
346 */
347 MAX_VALUE = 0x10ffff
348 };
349
350 //----------------------------------------------------------------
351 // Constructors &c
352 //----------------------------------------------------------------
353
354 public:
355
356 /**
357 * Constructs an empty set.
358 * @stable ICU 2.0
359 */
360 UnicodeSet();
361
362 /**
363 * Constructs a set containing the given range. If <code>end >
364 * start</code> then an empty set is created.
365 *
366 * @param start first character, inclusive, of range
367 * @param end last character, inclusive, of range
368 * @stable ICU 2.4
369 */
370 UnicodeSet(UChar32 start, UChar32 end);
371
372 /**
373 * Constructs a set from the given pattern. See the class
374 * description for the syntax of the pattern language.
375 * @param pattern a string specifying what characters are in the set
376 * @param status returns <code>U_ILLEGAL_ARGUMENT_ERROR</code> if the pattern
377 * contains a syntax error.
378 * @stable ICU 2.0
379 */
380 UnicodeSet(const UnicodeString& pattern,
381 UErrorCode& status);
382
383 #ifndef U_HIDE_INTERNAL_API
384 /**
385 * Constructs a set from the given pattern. See the class
386 * description for the syntax of the pattern language.
387 * @param pattern a string specifying what characters are in the set
388 * @param options bitmask for options to apply to the pattern.
389 * Valid options are USET_IGNORE_SPACE and USET_CASE_INSENSITIVE.
390 * @param symbols a symbol table mapping variable names to values
391 * and stand-in characters to UnicodeSets; may be NULL
392 * @param status returns <code>U_ILLEGAL_ARGUMENT_ERROR</code> if the pattern
393 * contains a syntax error.
394 * @internal
395 */
396 UnicodeSet(const UnicodeString& pattern,
397 uint32_t options,
398 const SymbolTable* symbols,
399 UErrorCode& status);
400 #endif /* U_HIDE_INTERNAL_API */
401
402 /**
403 * Constructs a set from the given pattern. See the class description
404 * for the syntax of the pattern language.
405 * @param pattern a string specifying what characters are in the set
406 * @param pos on input, the position in pattern at which to start parsing.
407 * On output, the position after the last character parsed.
408 * @param options bitmask for options to apply to the pattern.
409 * Valid options are USET_IGNORE_SPACE and USET_CASE_INSENSITIVE.
410 * @param symbols a symbol table mapping variable names to values
411 * and stand-in characters to UnicodeSets; may be NULL
412 * @param status input-output error code
413 * @stable ICU 2.8
414 */
415 UnicodeSet(const UnicodeString& pattern, ParsePosition& pos,
416 uint32_t options,
417 const SymbolTable* symbols,
418 UErrorCode& status);
419
420 /**
421 * Constructs a set that is identical to the given UnicodeSet.
422 * @stable ICU 2.0
423 */
424 UnicodeSet(const UnicodeSet& o);
425
426 /**
427 * Destructs the set.
428 * @stable ICU 2.0
429 */
430 virtual ~UnicodeSet();
431
432 /**
433 * Assigns this object to be a copy of another.
434 * A frozen set will not be modified.
435 * @stable ICU 2.0
436 */
437 UnicodeSet& operator=(const UnicodeSet& o);
438
439 /**
440 * Compares the specified object with this set for equality. Returns
441 * <tt>true</tt> if the two sets
442 * have the same size, and every member of the specified set is
443 * contained in this set (or equivalently, every member of this set is
444 * contained in the specified set).
445 *
446 * @param o set to be compared for equality with this set.
447 * @return <tt>true</tt> if the specified set is equal to this set.
448 * @stable ICU 2.0
449 */
450 virtual UBool operator==(const UnicodeSet& o) const;
451
452 /**
453 * Compares the specified object with this set for equality. Returns
454 * <tt>true</tt> if the specified set is not equal to this set.
455 * @stable ICU 2.0
456 */
457 UBool operator!=(const UnicodeSet& o) const;
458
459 /**
460 * Returns a copy of this object. All UnicodeFunctor objects have
461 * to support cloning in order to allow classes using
462 * UnicodeFunctors, such as Transliterator, to implement cloning.
463 * If this set is frozen, then the clone will be frozen as well.
464 * Use cloneAsThawed() for a mutable clone of a frozen set.
465 * @see cloneAsThawed
466 * @stable ICU 2.0
467 */
468 virtual UnicodeFunctor* clone() const;
469
470 /**
471 * Returns the hash code value for this set.
472 *
473 * @return the hash code value for this set.
474 * @see Object#hashCode()
475 * @stable ICU 2.0
476 */
477 virtual int32_t hashCode(void) const;
478
479 /**
480 * Get a UnicodeSet pointer from a USet
481 *
482 * @param uset a USet (the ICU plain C type for UnicodeSet)
483 * @return the corresponding UnicodeSet pointer.
484 *
485 * @stable ICU 4.2
486 */
487 inline static UnicodeSet *fromUSet(USet *uset);
488
489 /**
490 * Get a UnicodeSet pointer from a const USet
491 *
492 * @param uset a const USet (the ICU plain C type for UnicodeSet)
493 * @return the corresponding UnicodeSet pointer.
494 *
495 * @stable ICU 4.2
496 */
497 inline static const UnicodeSet *fromUSet(const USet *uset);
498
499 /**
500 * Produce a USet * pointer for this UnicodeSet.
501 * USet is the plain C type for UnicodeSet
502 *
503 * @return a USet pointer for this UnicodeSet
504 * @stable ICU 4.2
505 */
506 inline USet *toUSet();
507
508
509 /**
510 * Produce a const USet * pointer for this UnicodeSet.
511 * USet is the plain C type for UnicodeSet
512 *
513 * @return a const USet pointer for this UnicodeSet
514 * @stable ICU 4.2
515 */
516 inline const USet * toUSet() const;
517
518
519 //----------------------------------------------------------------
520 // Freezable API
521 //----------------------------------------------------------------
522
523 /**
524 * Determines whether the set has been frozen (made immutable) or not.
525 * See the ICU4J Freezable interface for details.
526 * @return TRUE/FALSE for whether the set has been frozen
527 * @see freeze
528 * @see cloneAsThawed
529 * @stable ICU 3.8
530 */
531 inline UBool isFrozen() const;
532
533 /**
534 * Freeze the set (make it immutable).
535 * Once frozen, it cannot be unfrozen and is therefore thread-safe
536 * until it is deleted.
537 * See the ICU4J Freezable interface for details.
538 * Freezing the set may also make some operations faster, for example
539 * contains() and span().
540 * A frozen set will not be modified. (It remains frozen.)
541 * @return this set.
542 * @see isFrozen
543 * @see cloneAsThawed
544 * @stable ICU 3.8
545 */
546 UnicodeFunctor *freeze();
547
548 /**
549 * Clone the set and make the clone mutable.
550 * See the ICU4J Freezable interface for details.
551 * @return the mutable clone
552 * @see freeze
553 * @see isFrozen
554 * @stable ICU 3.8
555 */
556 UnicodeFunctor *cloneAsThawed() const;
557
558 //----------------------------------------------------------------
559 // Public API
560 //----------------------------------------------------------------
561
562 /**
563 * Make this object represent the range <code>start - end</code>.
564 * If <code>end > start</code> then this object is set to an
565 * an empty range.
566 * A frozen set will not be modified.
567 *
568 * @param start first character in the set, inclusive
569 * @param end last character in the set, inclusive
570 * @stable ICU 2.4
571 */
572 UnicodeSet& set(UChar32 start, UChar32 end);
573
574 /**
575 * Return true if the given position, in the given pattern, appears
576 * to be the start of a UnicodeSet pattern.
577 * @stable ICU 2.4
578 */
579 static UBool resemblesPattern(const UnicodeString& pattern,
580 int32_t pos);
581
582 /**
583 * Modifies this set to represent the set specified by the given
584 * pattern, ignoring Unicode Pattern_White_Space characters.
585 * See the class description for the syntax of the pattern language.
586 * A frozen set will not be modified.
587 * @param pattern a string specifying what characters are in the set
588 * @param status returns <code>U_ILLEGAL_ARGUMENT_ERROR</code> if the pattern
589 * contains a syntax error.
590 * <em> Empties the set passed before applying the pattern.</em>
591 * @return a reference to this
592 * @stable ICU 2.0
593 */
594 UnicodeSet& applyPattern(const UnicodeString& pattern,
595 UErrorCode& status);
596
597 #ifndef U_HIDE_INTERNAL_API
598 /**
599 * Modifies this set to represent the set specified by the given
600 * pattern, optionally ignoring Unicode Pattern_White_Space characters.
601 * See the class description for the syntax of the pattern language.
602 * A frozen set will not be modified.
603 * @param pattern a string specifying what characters are in the set
604 * @param options bitmask for options to apply to the pattern.
605 * Valid options are USET_IGNORE_SPACE and USET_CASE_INSENSITIVE.
606 * @param symbols a symbol table mapping variable names to
607 * values and stand-ins to UnicodeSets; may be NULL
608 * @param status returns <code>U_ILLEGAL_ARGUMENT_ERROR</code> if the pattern
609 * contains a syntax error.
610 *<em> Empties the set passed before applying the pattern.</em>
611 * @return a reference to this
612 * @internal
613 */
614 UnicodeSet& applyPattern(const UnicodeString& pattern,
615 uint32_t options,
616 const SymbolTable* symbols,
617 UErrorCode& status);
618 #endif /* U_HIDE_INTERNAL_API */
619
620 /**
621 * Parses the given pattern, starting at the given position. The
622 * character at pattern.charAt(pos.getIndex()) must be '[', or the
623 * parse fails. Parsing continues until the corresponding closing
624 * ']'. If a syntax error is encountered between the opening and
625 * closing brace, the parse fails. Upon return from a successful
626 * parse, the ParsePosition is updated to point to the character
627 * following the closing ']', and a StringBuffer containing a
628 * pairs list for the parsed pattern is returned. This method calls
629 * itself recursively to parse embedded subpatterns.
630 *<em> Empties the set passed before applying the pattern.</em>
631 * A frozen set will not be modified.
632 *
633 * @param pattern the string containing the pattern to be parsed.
634 * The portion of the string from pos.getIndex(), which must be a
635 * '[', to the corresponding closing ']', is parsed.
636 * @param pos upon entry, the position at which to being parsing.
637 * The character at pattern.charAt(pos.getIndex()) must be a '['.
638 * Upon return from a successful parse, pos.getIndex() is either
639 * the character after the closing ']' of the parsed pattern, or
640 * pattern.length() if the closing ']' is the last character of
641 * the pattern string.
642 * @param options bitmask for options to apply to the pattern.
643 * Valid options are USET_IGNORE_SPACE and USET_CASE_INSENSITIVE.
644 * @param symbols a symbol table mapping variable names to
645 * values and stand-ins to UnicodeSets; may be NULL
646 * @param status returns <code>U_ILLEGAL_ARGUMENT_ERROR</code> if the pattern
647 * contains a syntax error.
648 * @return a reference to this
649 * @stable ICU 2.8
650 */
651 UnicodeSet& applyPattern(const UnicodeString& pattern,
652 ParsePosition& pos,
653 uint32_t options,
654 const SymbolTable* symbols,
655 UErrorCode& status);
656
657 /**
658 * Returns a string representation of this set. If the result of
659 * calling this function is passed to a UnicodeSet constructor, it
660 * will produce another set that is equal to this one.
661 * A frozen set will not be modified.
662 * @param result the string to receive the rules. Previous
663 * contents will be deleted.
664 * @param escapeUnprintable if TRUE then convert unprintable
665 * character to their hex escape representations, \\uxxxx or
666 * \\Uxxxxxxxx. Unprintable characters are those other than
667 * U+000A, U+0020..U+007E.
668 * @stable ICU 2.0
669 */
670 virtual UnicodeString& toPattern(UnicodeString& result,
671 UBool escapeUnprintable = FALSE) const;
672
673 /**
674 * Modifies this set to contain those code points which have the given value
675 * for the given binary or enumerated property, as returned by
676 * u_getIntPropertyValue. Prior contents of this set are lost.
677 * A frozen set will not be modified.
678 *
679 * @param prop a property in the range UCHAR_BIN_START..UCHAR_BIN_LIMIT-1
680 * or UCHAR_INT_START..UCHAR_INT_LIMIT-1
681 * or UCHAR_MASK_START..UCHAR_MASK_LIMIT-1.
682 *
683 * @param value a value in the range u_getIntPropertyMinValue(prop)..
684 * u_getIntPropertyMaxValue(prop), with one exception. If prop is
685 * UCHAR_GENERAL_CATEGORY_MASK, then value should not be a UCharCategory, but
686 * rather a mask value produced by U_GET_GC_MASK(). This allows grouped
687 * categories such as [:L:] to be represented.
688 *
689 * @param ec error code input/output parameter
690 *
691 * @return a reference to this set
692 *
693 * @stable ICU 2.4
694 */
695 UnicodeSet& applyIntPropertyValue(UProperty prop,
696 int32_t value,
697 UErrorCode& ec);
698
699 /**
700 * Modifies this set to contain those code points which have the
701 * given value for the given property. Prior contents of this
702 * set are lost.
703 * A frozen set will not be modified.
704 *
705 * @param prop a property alias, either short or long. The name is matched
706 * loosely. See PropertyAliases.txt for names and a description of loose
707 * matching. If the value string is empty, then this string is interpreted
708 * as either a General_Category value alias, a Script value alias, a binary
709 * property alias, or a special ID. Special IDs are matched loosely and
710 * correspond to the following sets:
711 *
712 * "ANY" = [\\u0000-\\U0010FFFF],
713 * "ASCII" = [\\u0000-\\u007F],
714 * "Assigned" = [:^Cn:].
715 *
716 * @param value a value alias, either short or long. The name is matched
717 * loosely. See PropertyValueAliases.txt for names and a description of
718 * loose matching. In addition to aliases listed, numeric values and
719 * canonical combining classes may be expressed numerically, e.g., ("nv",
720 * "0.5") or ("ccc", "220"). The value string may also be empty.
721 *
722 * @param ec error code input/output parameter
723 *
724 * @return a reference to this set
725 *
726 * @stable ICU 2.4
727 */
728 UnicodeSet& applyPropertyAlias(const UnicodeString& prop,
729 const UnicodeString& value,
730 UErrorCode& ec);
731
732 /**
733 * Returns the number of elements in this set (its cardinality).
734 * Note than the elements of a set may include both individual
735 * codepoints and strings.
736 *
737 * @return the number of elements in this set (its cardinality).
738 * @stable ICU 2.0
739 */
740 virtual int32_t size(void) const;
741
742 /**
743 * Returns <tt>true</tt> if this set contains no elements.
744 *
745 * @return <tt>true</tt> if this set contains no elements.
746 * @stable ICU 2.0
747 */
748 virtual UBool isEmpty(void) const;
749
750 /**
751 * Returns true if this set contains the given character.
752 * This function works faster with a frozen set.
753 * @param c character to be checked for containment
754 * @return true if the test condition is met
755 * @stable ICU 2.0
756 */
757 virtual UBool contains(UChar32 c) const;
758
759 /**
760 * Returns true if this set contains every character
761 * of the given range.
762 * @param start first character, inclusive, of the range
763 * @param end last character, inclusive, of the range
764 * @return true if the test condition is met
765 * @stable ICU 2.0
766 */
767 virtual UBool contains(UChar32 start, UChar32 end) const;
768
769 /**
770 * Returns <tt>true</tt> if this set contains the given
771 * multicharacter string.
772 * @param s string to be checked for containment
773 * @return <tt>true</tt> if this set contains the specified string
774 * @stable ICU 2.4
775 */
776 UBool contains(const UnicodeString& s) const;
777
778 /**
779 * Returns true if this set contains all the characters and strings
780 * of the given set.
781 * @param c set to be checked for containment
782 * @return true if the test condition is met
783 * @stable ICU 2.4
784 */
785 virtual UBool containsAll(const UnicodeSet& c) const;
786
787 /**
788 * Returns true if this set contains all the characters
789 * of the given string.
790 * @param s string containing characters to be checked for containment
791 * @return true if the test condition is met
792 * @stable ICU 2.4
793 */
794 UBool containsAll(const UnicodeString& s) const;
795
796 /**
797 * Returns true if this set contains none of the characters
798 * of the given range.
799 * @param start first character, inclusive, of the range
800 * @param end last character, inclusive, of the range
801 * @return true if the test condition is met
802 * @stable ICU 2.4
803 */
804 UBool containsNone(UChar32 start, UChar32 end) const;
805
806 /**
807 * Returns true if this set contains none of the characters and strings
808 * of the given set.
809 * @param c set to be checked for containment
810 * @return true if the test condition is met
811 * @stable ICU 2.4
812 */
813 UBool containsNone(const UnicodeSet& c) const;
814
815 /**
816 * Returns true if this set contains none of the characters
817 * of the given string.
818 * @param s string containing characters to be checked for containment
819 * @return true if the test condition is met
820 * @stable ICU 2.4
821 */
822 UBool containsNone(const UnicodeString& s) const;
823
824 /**
825 * Returns true if this set contains one or more of the characters
826 * in the given range.
827 * @param start first character, inclusive, of the range
828 * @param end last character, inclusive, of the range
829 * @return true if the condition is met
830 * @stable ICU 2.4
831 */
832 inline UBool containsSome(UChar32 start, UChar32 end) const;
833
834 /**
835 * Returns true if this set contains one or more of the characters
836 * and strings of the given set.
837 * @param s The set to be checked for containment
838 * @return true if the condition is met
839 * @stable ICU 2.4
840 */
841 inline UBool containsSome(const UnicodeSet& s) const;
842
843 /**
844 * Returns true if this set contains one or more of the characters
845 * of the given string.
846 * @param s string containing characters to be checked for containment
847 * @return true if the condition is met
848 * @stable ICU 2.4
849 */
850 inline UBool containsSome(const UnicodeString& s) const;
851
852 /**
853 * Returns the length of the initial substring of the input string which
854 * consists only of characters and strings that are contained in this set
855 * (USET_SPAN_CONTAINED, USET_SPAN_SIMPLE),
856 * or only of characters and strings that are not contained
857 * in this set (USET_SPAN_NOT_CONTAINED).
858 * See USetSpanCondition for details.
859 * Similar to the strspn() C library function.
860 * Unpaired surrogates are treated according to contains() of their surrogate code points.
861 * This function works faster with a frozen set and with a non-negative string length argument.
862 * @param s start of the string
863 * @param length of the string; can be -1 for NUL-terminated
864 * @param spanCondition specifies the containment condition
865 * @return the length of the initial substring according to the spanCondition;
866 * 0 if the start of the string does not fit the spanCondition
867 * @stable ICU 3.8
868 * @see USetSpanCondition
869 */
870 int32_t span(const UChar *s, int32_t length, USetSpanCondition spanCondition) const;
871
872 /**
873 * Returns the end of the substring of the input string according to the USetSpanCondition.
874 * Same as <code>start+span(s.getBuffer()+start, s.length()-start, spanCondition)</code>
875 * after pinning start to 0<=start<=s.length().
876 * @param s the string
877 * @param start the start index in the string for the span operation
878 * @param spanCondition specifies the containment condition
879 * @return the exclusive end of the substring according to the spanCondition;
880 * the substring s.tempSubStringBetween(start, end) fulfills the spanCondition
881 * @stable ICU 4.4
882 * @see USetSpanCondition
883 */
884 inline int32_t span(const UnicodeString &s, int32_t start, USetSpanCondition spanCondition) const;
885
886 /**
887 * Returns the start of the trailing substring of the input string which
888 * consists only of characters and strings that are contained in this set
889 * (USET_SPAN_CONTAINED, USET_SPAN_SIMPLE),
890 * or only of characters and strings that are not contained
891 * in this set (USET_SPAN_NOT_CONTAINED).
892 * See USetSpanCondition for details.
893 * Unpaired surrogates are treated according to contains() of their surrogate code points.
894 * This function works faster with a frozen set and with a non-negative string length argument.
895 * @param s start of the string
896 * @param length of the string; can be -1 for NUL-terminated
897 * @param spanCondition specifies the containment condition
898 * @return the start of the trailing substring according to the spanCondition;
899 * the string length if the end of the string does not fit the spanCondition
900 * @stable ICU 3.8
901 * @see USetSpanCondition
902 */
903 int32_t spanBack(const UChar *s, int32_t length, USetSpanCondition spanCondition) const;
904
905 /**
906 * Returns the start of the substring of the input string according to the USetSpanCondition.
907 * Same as <code>spanBack(s.getBuffer(), limit, spanCondition)</code>
908 * after pinning limit to 0<=end<=s.length().
909 * @param s the string
910 * @param limit the exclusive-end index in the string for the span operation
911 * (use s.length() or INT32_MAX for spanning back from the end of the string)
912 * @param spanCondition specifies the containment condition
913 * @return the start of the substring according to the spanCondition;
914 * the substring s.tempSubStringBetween(start, limit) fulfills the spanCondition
915 * @stable ICU 4.4
916 * @see USetSpanCondition
917 */
918 inline int32_t spanBack(const UnicodeString &s, int32_t limit, USetSpanCondition spanCondition) const;
919
920 /**
921 * Returns the length of the initial substring of the input string which
922 * consists only of characters and strings that are contained in this set
923 * (USET_SPAN_CONTAINED, USET_SPAN_SIMPLE),
924 * or only of characters and strings that are not contained
925 * in this set (USET_SPAN_NOT_CONTAINED).
926 * See USetSpanCondition for details.
927 * Similar to the strspn() C library function.
928 * Malformed byte sequences are treated according to contains(0xfffd).
929 * This function works faster with a frozen set and with a non-negative string length argument.
930 * @param s start of the string (UTF-8)
931 * @param length of the string; can be -1 for NUL-terminated
932 * @param spanCondition specifies the containment condition
933 * @return the length of the initial substring according to the spanCondition;
934 * 0 if the start of the string does not fit the spanCondition
935 * @stable ICU 3.8
936 * @see USetSpanCondition
937 */
938 int32_t spanUTF8(const char *s, int32_t length, USetSpanCondition spanCondition) const;
939
940 /**
941 * Returns the start of the trailing substring of the input string which
942 * consists only of characters and strings that are contained in this set
943 * (USET_SPAN_CONTAINED, USET_SPAN_SIMPLE),
944 * or only of characters and strings that are not contained
945 * in this set (USET_SPAN_NOT_CONTAINED).
946 * See USetSpanCondition for details.
947 * Malformed byte sequences are treated according to contains(0xfffd).
948 * This function works faster with a frozen set and with a non-negative string length argument.
949 * @param s start of the string (UTF-8)
950 * @param length of the string; can be -1 for NUL-terminated
951 * @param spanCondition specifies the containment condition
952 * @return the start of the trailing substring according to the spanCondition;
953 * the string length if the end of the string does not fit the spanCondition
954 * @stable ICU 3.8
955 * @see USetSpanCondition
956 */
957 int32_t spanBackUTF8(const char *s, int32_t length, USetSpanCondition spanCondition) const;
958
959 /**
960 * Implement UnicodeMatcher::matches()
961 * @stable ICU 2.4
962 */
963 virtual UMatchDegree matches(const Replaceable& text,
964 int32_t& offset,
965 int32_t limit,
966 UBool incremental);
967
968 private:
969 /**
970 * Returns the longest match for s in text at the given position.
971 * If limit > start then match forward from start+1 to limit
972 * matching all characters except s.charAt(0). If limit < start,
973 * go backward starting from start-1 matching all characters
974 * except s.charAt(s.length()-1). This method assumes that the
975 * first character, text.charAt(start), matches s, so it does not
976 * check it.
977 * @param text the text to match
978 * @param start the first character to match. In the forward
979 * direction, text.charAt(start) is matched against s.charAt(0).
980 * In the reverse direction, it is matched against
981 * s.charAt(s.length()-1).
982 * @param limit the limit offset for matching, either last+1 in
983 * the forward direction, or last-1 in the reverse direction,
984 * where last is the index of the last character to match.
985 * @param s
986 * @return If part of s matches up to the limit, return |limit -
987 * start|. If all of s matches before reaching the limit, return
988 * s.length(). If there is a mismatch between s and text, return
989 * 0
990 */
991 static int32_t matchRest(const Replaceable& text,
992 int32_t start, int32_t limit,
993 const UnicodeString& s);
994
995 /**
996 * Returns the smallest value i such that c < list[i]. Caller
997 * must ensure that c is a legal value or this method will enter
998 * an infinite loop. This method performs a binary search.
999 * @param c a character in the range MIN_VALUE..MAX_VALUE
1000 * inclusive
1001 * @return the smallest integer i in the range 0..len-1,
1002 * inclusive, such that c < list[i]
1003 */
1004 int32_t findCodePoint(UChar32 c) const;
1005
1006 public:
1007
1008 /**
1009 * Implementation of UnicodeMatcher API. Union the set of all
1010 * characters that may be matched by this object into the given
1011 * set.
1012 * @param toUnionTo the set into which to union the source characters
1013 * @stable ICU 2.4
1014 */
1015 virtual void addMatchSetTo(UnicodeSet& toUnionTo) const;
1016
1017 /**
1018 * Returns the index of the given character within this set, where
1019 * the set is ordered by ascending code point. If the character
1020 * is not in this set, return -1. The inverse of this method is
1021 * <code>charAt()</code>.
1022 * @return an index from 0..size()-1, or -1
1023 * @stable ICU 2.4
1024 */
1025 int32_t indexOf(UChar32 c) const;
1026
1027 /**
1028 * Returns the character at the given index within this set, where
1029 * the set is ordered by ascending code point. If the index is
1030 * out of range, return (UChar32)-1. The inverse of this method is
1031 * <code>indexOf()</code>.
1032 * @param index an index from 0..size()-1
1033 * @return the character at the given index, or (UChar32)-1.
1034 * @stable ICU 2.4
1035 */
1036 UChar32 charAt(int32_t index) const;
1037
1038 /**
1039 * Adds the specified range to this set if it is not already
1040 * present. If this set already contains the specified range,
1041 * the call leaves this set unchanged. If <code>end > start</code>
1042 * then an empty range is added, leaving the set unchanged.
1043 * This is equivalent to a boolean logic OR, or a set UNION.
1044 * A frozen set will not be modified.
1045 *
1046 * @param start first character, inclusive, of range to be added
1047 * to this set.
1048 * @param end last character, inclusive, of range to be added
1049 * to this set.
1050 * @stable ICU 2.0
1051 */
1052 virtual UnicodeSet& add(UChar32 start, UChar32 end);
1053
1054 /**
1055 * Adds the specified character to this set if it is not already
1056 * present. If this set already contains the specified character,
1057 * the call leaves this set unchanged.
1058 * A frozen set will not be modified.
1059 * @stable ICU 2.0
1060 */
1061 UnicodeSet& add(UChar32 c);
1062
1063 /**
1064 * Adds the specified multicharacter to this set if it is not already
1065 * present. If this set already contains the multicharacter,
1066 * the call leaves this set unchanged.
1067 * Thus "ch" => {"ch"}
1068 * <br><b>Warning: you cannot add an empty string ("") to a UnicodeSet.</b>
1069 * A frozen set will not be modified.
1070 * @param s the source string
1071 * @return this object, for chaining
1072 * @stable ICU 2.4
1073 */
1074 UnicodeSet& add(const UnicodeString& s);
1075
1076 private:
1077 /**
1078 * @return a code point IF the string consists of a single one.
1079 * otherwise returns -1.
1080 * @param s string to test
1081 */
1082 static int32_t getSingleCP(const UnicodeString& s);
1083
1084 void _add(const UnicodeString& s);
1085
1086 public:
1087 /**
1088 * Adds each of the characters in this string to the set. Thus "ch" => {"c", "h"}
1089 * If this set already any particular character, it has no effect on that character.
1090 * A frozen set will not be modified.
1091 * @param s the source string
1092 * @return this object, for chaining
1093 * @stable ICU 2.4
1094 */
1095 UnicodeSet& addAll(const UnicodeString& s);
1096
1097 /**
1098 * Retains EACH of the characters in this string. Note: "ch" == {"c", "h"}
1099 * If this set already any particular character, it has no effect on that character.
1100 * A frozen set will not be modified.
1101 * @param s the source string
1102 * @return this object, for chaining
1103 * @stable ICU 2.4
1104 */
1105 UnicodeSet& retainAll(const UnicodeString& s);
1106
1107 /**
1108 * Complement EACH of the characters in this string. Note: "ch" == {"c", "h"}
1109 * If this set already any particular character, it has no effect on that character.
1110 * A frozen set will not be modified.
1111 * @param s the source string
1112 * @return this object, for chaining
1113 * @stable ICU 2.4
1114 */
1115 UnicodeSet& complementAll(const UnicodeString& s);
1116
1117 /**
1118 * Remove EACH of the characters in this string. Note: "ch" == {"c", "h"}
1119 * If this set already any particular character, it has no effect on that character.
1120 * A frozen set will not be modified.
1121 * @param s the source string
1122 * @return this object, for chaining
1123 * @stable ICU 2.4
1124 */
1125 UnicodeSet& removeAll(const UnicodeString& s);
1126
1127 /**
1128 * Makes a set from a multicharacter string. Thus "ch" => {"ch"}
1129 * <br><b>Warning: you cannot add an empty string ("") to a UnicodeSet.</b>
1130 * @param s the source string
1131 * @return a newly created set containing the given string.
1132 * The caller owns the return object and is responsible for deleting it.
1133 * @stable ICU 2.4
1134 */
1135 static UnicodeSet* U_EXPORT2 createFrom(const UnicodeString& s);
1136
1137
1138 /**
1139 * Makes a set from each of the characters in the string. Thus "ch" => {"c", "h"}
1140 * @param s the source string
1141 * @return a newly created set containing the given characters
1142 * The caller owns the return object and is responsible for deleting it.
1143 * @stable ICU 2.4
1144 */
1145 static UnicodeSet* U_EXPORT2 createFromAll(const UnicodeString& s);
1146
1147 /**
1148 * Retain only the elements in this set that are contained in the
1149 * specified range. If <code>end > start</code> then an empty range is
1150 * retained, leaving the set empty. This is equivalent to
1151 * a boolean logic AND, or a set INTERSECTION.
1152 * A frozen set will not be modified.
1153 *
1154 * @param start first character, inclusive, of range to be retained
1155 * to this set.
1156 * @param end last character, inclusive, of range to be retained
1157 * to this set.
1158 * @stable ICU 2.0
1159 */
1160 virtual UnicodeSet& retain(UChar32 start, UChar32 end);
1161
1162
1163 /**
1164 * Retain the specified character from this set if it is present.
1165 * A frozen set will not be modified.
1166 * @stable ICU 2.0
1167 */
1168 UnicodeSet& retain(UChar32 c);
1169
1170 /**
1171 * Removes the specified range from this set if it is present.
1172 * The set will not contain the specified range once the call
1173 * returns. If <code>end > start</code> then an empty range is
1174 * removed, leaving the set unchanged.
1175 * A frozen set will not be modified.
1176 *
1177 * @param start first character, inclusive, of range to be removed
1178 * from this set.
1179 * @param end last character, inclusive, of range to be removed
1180 * from this set.
1181 * @stable ICU 2.0
1182 */
1183 virtual UnicodeSet& remove(UChar32 start, UChar32 end);
1184
1185 /**
1186 * Removes the specified character from this set if it is present.
1187 * The set will not contain the specified range once the call
1188 * returns.
1189 * A frozen set will not be modified.
1190 * @stable ICU 2.0
1191 */
1192 UnicodeSet& remove(UChar32 c);
1193
1194 /**
1195 * Removes the specified string from this set if it is present.
1196 * The set will not contain the specified character once the call
1197 * returns.
1198 * A frozen set will not be modified.
1199 * @param s the source string
1200 * @return this object, for chaining
1201 * @stable ICU 2.4
1202 */
1203 UnicodeSet& remove(const UnicodeString& s);
1204
1205 /**
1206 * Inverts this set. This operation modifies this set so that
1207 * its value is its complement. This is equivalent to
1208 * <code>complement(MIN_VALUE, MAX_VALUE)</code>.
1209 * A frozen set will not be modified.
1210 * @stable ICU 2.0
1211 */
1212 virtual UnicodeSet& complement(void);
1213
1214 /**
1215 * Complements the specified range in this set. Any character in
1216 * the range will be removed if it is in this set, or will be
1217 * added if it is not in this set. If <code>end > start</code>
1218 * then an empty range is complemented, leaving the set unchanged.
1219 * This is equivalent to a boolean logic XOR.
1220 * A frozen set will not be modified.
1221 *
1222 * @param start first character, inclusive, of range to be removed
1223 * from this set.
1224 * @param end last character, inclusive, of range to be removed
1225 * from this set.
1226 * @stable ICU 2.0
1227 */
1228 virtual UnicodeSet& complement(UChar32 start, UChar32 end);
1229
1230 /**
1231 * Complements the specified character in this set. The character
1232 * will be removed if it is in this set, or will be added if it is
1233 * not in this set.
1234 * A frozen set will not be modified.
1235 * @stable ICU 2.0
1236 */
1237 UnicodeSet& complement(UChar32 c);
1238
1239 /**
1240 * Complement the specified string in this set.
1241 * The set will not contain the specified string once the call
1242 * returns.
1243 * <br><b>Warning: you cannot add an empty string ("") to a UnicodeSet.</b>
1244 * A frozen set will not be modified.
1245 * @param s the string to complement
1246 * @return this object, for chaining
1247 * @stable ICU 2.4
1248 */
1249 UnicodeSet& complement(const UnicodeString& s);
1250
1251 /**
1252 * Adds all of the elements in the specified set to this set if
1253 * they're not already present. This operation effectively
1254 * modifies this set so that its value is the <i>union</i> of the two
1255 * sets. The behavior of this operation is unspecified if the specified
1256 * collection is modified while the operation is in progress.
1257 * A frozen set will not be modified.
1258 *
1259 * @param c set whose elements are to be added to this set.
1260 * @see #add(UChar32, UChar32)
1261 * @stable ICU 2.0
1262 */
1263 virtual UnicodeSet& addAll(const UnicodeSet& c);
1264
1265 /**
1266 * Retains only the elements in this set that are contained in the
1267 * specified set. In other words, removes from this set all of
1268 * its elements that are not contained in the specified set. This
1269 * operation effectively modifies this set so that its value is
1270 * the <i>intersection</i> of the two sets.
1271 * A frozen set will not be modified.
1272 *
1273 * @param c set that defines which elements this set will retain.
1274 * @stable ICU 2.0
1275 */
1276 virtual UnicodeSet& retainAll(const UnicodeSet& c);
1277
1278 /**
1279 * Removes from this set all of its elements that are contained in the
1280 * specified set. This operation effectively modifies this
1281 * set so that its value is the <i>asymmetric set difference</i> of
1282 * the two sets.
1283 * A frozen set will not be modified.
1284 *
1285 * @param c set that defines which elements will be removed from
1286 * this set.
1287 * @stable ICU 2.0
1288 */
1289 virtual UnicodeSet& removeAll(const UnicodeSet& c);
1290
1291 /**
1292 * Complements in this set all elements contained in the specified
1293 * set. Any character in the other set will be removed if it is
1294 * in this set, or will be added if it is not in this set.
1295 * A frozen set will not be modified.
1296 *
1297 * @param c set that defines which elements will be xor'ed from
1298 * this set.
1299 * @stable ICU 2.4
1300 */
1301 virtual UnicodeSet& complementAll(const UnicodeSet& c);
1302
1303 /**
1304 * Removes all of the elements from this set. This set will be
1305 * empty after this call returns.
1306 * A frozen set will not be modified.
1307 * @stable ICU 2.0
1308 */
1309 virtual UnicodeSet& clear(void);
1310
1311 /**
1312 * Close this set over the given attribute. For the attribute
1313 * USET_CASE, the result is to modify this set so that:
1314 *
1315 * 1. For each character or string 'a' in this set, all strings or
1316 * characters 'b' such that foldCase(a) == foldCase(b) are added
1317 * to this set.
1318 *
1319 * 2. For each string 'e' in the resulting set, if e !=
1320 * foldCase(e), 'e' will be removed.
1321 *
1322 * Example: [aq\\u00DF{Bc}{bC}{Fi}] => [aAqQ\\u00DF\\uFB01{ss}{bc}{fi}]
1323 *
1324 * (Here foldCase(x) refers to the operation u_strFoldCase, and a
1325 * == b denotes that the contents are the same, not pointer
1326 * comparison.)
1327 *
1328 * A frozen set will not be modified.
1329 *
1330 * @param attribute bitmask for attributes to close over.
1331 * Currently only the USET_CASE bit is supported. Any undefined bits
1332 * are ignored.
1333 * @return a reference to this set.
1334 * @stable ICU 4.2
1335 */
1336 UnicodeSet& closeOver(int32_t attribute);
1337
1338 /**
1339 * Remove all strings from this set.
1340 *
1341 * @return a reference to this set.
1342 * @stable ICU 4.2
1343 */
1344 virtual UnicodeSet &removeAllStrings();
1345
1346 /**
1347 * Iteration method that returns the number of ranges contained in
1348 * this set.
1349 * @see #getRangeStart
1350 * @see #getRangeEnd
1351 * @stable ICU 2.4
1352 */
1353 virtual int32_t getRangeCount(void) const;
1354
1355 /**
1356 * Iteration method that returns the first character in the
1357 * specified range of this set.
1358 * @see #getRangeCount
1359 * @see #getRangeEnd
1360 * @stable ICU 2.4
1361 */
1362 virtual UChar32 getRangeStart(int32_t index) const;
1363
1364 /**
1365 * Iteration method that returns the last character in the
1366 * specified range of this set.
1367 * @see #getRangeStart
1368 * @see #getRangeEnd
1369 * @stable ICU 2.4
1370 */
1371 virtual UChar32 getRangeEnd(int32_t index) const;
1372
1373 /**
1374 * Serializes this set into an array of 16-bit integers. Serialization
1375 * (currently) only records the characters in the set; multicharacter
1376 * strings are ignored.
1377 *
1378 * The array has following format (each line is one 16-bit
1379 * integer):
1380 *
1381 * length = (n+2*m) | (m!=0?0x8000:0)
1382 * bmpLength = n; present if m!=0
1383 * bmp[0]
1384 * bmp[1]
1385 * ...
1386 * bmp[n-1]
1387 * supp-high[0]
1388 * supp-low[0]
1389 * supp-high[1]
1390 * supp-low[1]
1391 * ...
1392 * supp-high[m-1]
1393 * supp-low[m-1]
1394 *
1395 * The array starts with a header. After the header are n bmp
1396 * code points, then m supplementary code points. Either n or m
1397 * or both may be zero. n+2*m is always <= 0x7FFF.
1398 *
1399 * If there are no supplementary characters (if m==0) then the
1400 * header is one 16-bit integer, 'length', with value n.
1401 *
1402 * If there are supplementary characters (if m!=0) then the header
1403 * is two 16-bit integers. The first, 'length', has value
1404 * (n+2*m)|0x8000. The second, 'bmpLength', has value n.
1405 *
1406 * After the header the code points are stored in ascending order.
1407 * Supplementary code points are stored as most significant 16
1408 * bits followed by least significant 16 bits.
1409 *
1410 * @param dest pointer to buffer of destCapacity 16-bit integers.
1411 * May be NULL only if destCapacity is zero.
1412 * @param destCapacity size of dest, or zero. Must not be negative.
1413 * @param ec error code. Will be set to U_INDEX_OUTOFBOUNDS_ERROR
1414 * if n+2*m > 0x7FFF. Will be set to U_BUFFER_OVERFLOW_ERROR if
1415 * n+2*m+(m!=0?2:1) > destCapacity.
1416 * @return the total length of the serialized format, including
1417 * the header, that is, n+2*m+(m!=0?2:1), or 0 on error other
1418 * than U_BUFFER_OVERFLOW_ERROR.
1419 * @stable ICU 2.4
1420 */
1421 int32_t serialize(uint16_t *dest, int32_t destCapacity, UErrorCode& ec) const;
1422
1423 /**
1424 * Reallocate this objects internal structures to take up the least
1425 * possible space, without changing this object's value.
1426 * A frozen set will not be modified.
1427 * @stable ICU 2.4
1428 */
1429 virtual UnicodeSet& compact();
1430
1431 /**
1432 * Return the class ID for this class. This is useful only for
1433 * comparing to a return value from getDynamicClassID(). For example:
1434 * <pre>
1435 * . Base* polymorphic_pointer = createPolymorphicObject();
1436 * . if (polymorphic_pointer->getDynamicClassID() ==
1437 * . Derived::getStaticClassID()) ...
1438 * </pre>
1439 * @return The class ID for all objects of this class.
1440 * @stable ICU 2.0
1441 */
1442 static UClassID U_EXPORT2 getStaticClassID(void);
1443
1444 /**
1445 * Implement UnicodeFunctor API.
1446 *
1447 * @return The class ID for this object. All objects of a given
1448 * class have the same class ID. Objects of other classes have
1449 * different class IDs.
1450 * @stable ICU 2.4
1451 */
1452 virtual UClassID getDynamicClassID(void) const;
1453
1454 private:
1455
1456 // Private API for the USet API
1457
1458 friend class USetAccess;
1459
1460 int32_t getStringCount() const;
1461
1462 const UnicodeString* getString(int32_t index) const;
1463
1464 //----------------------------------------------------------------
1465 // RuleBasedTransliterator support
1466 //----------------------------------------------------------------
1467
1468 private:
1469
1470 /**
1471 * Returns <tt>true</tt> if this set contains any character whose low byte
1472 * is the given value. This is used by <tt>RuleBasedTransliterator</tt> for
1473 * indexing.
1474 */
1475 virtual UBool matchesIndexValue(uint8_t v) const;
1476
1477 private:
1478 friend class RBBIRuleScanner;
1479
1480 //----------------------------------------------------------------
1481 // Implementation: Clone as thawed (see ICU4J Freezable)
1482 //----------------------------------------------------------------
1483
1484 UnicodeSet(const UnicodeSet& o, UBool /* asThawed */);
1485
1486 //----------------------------------------------------------------
1487 // Implementation: Pattern parsing
1488 //----------------------------------------------------------------
1489
1490 void applyPatternIgnoreSpace(const UnicodeString& pattern,
1491 ParsePosition& pos,
1492 const SymbolTable* symbols,
1493 UErrorCode& status);
1494
1495 void applyPattern(RuleCharacterIterator& chars,
1496 const SymbolTable* symbols,
1497 UnicodeString& rebuiltPat,
1498 uint32_t options,
1499 UnicodeSet& (UnicodeSet::*caseClosure)(int32_t attribute),
1500 UErrorCode& ec);
1501
1502 //----------------------------------------------------------------
1503 // Implementation: Utility methods
1504 //----------------------------------------------------------------
1505
1506 void ensureCapacity(int32_t newLen, UErrorCode& ec);
1507
1508 void ensureBufferCapacity(int32_t newLen, UErrorCode& ec);
1509
1510 void swapBuffers(void);
1511
1512 UBool allocateStrings(UErrorCode &status);
1513
1514 UnicodeString& _toPattern(UnicodeString& result,
1515 UBool escapeUnprintable) const;
1516
1517 UnicodeString& _generatePattern(UnicodeString& result,
1518 UBool escapeUnprintable) const;
1519
1520 static void _appendToPat(UnicodeString& buf, const UnicodeString& s, UBool escapeUnprintable);
1521
1522 static void _appendToPat(UnicodeString& buf, UChar32 c, UBool escapeUnprintable);
1523
1524 //----------------------------------------------------------------
1525 // Implementation: Fundamental operators
1526 //----------------------------------------------------------------
1527
1528 void exclusiveOr(const UChar32* other, int32_t otherLen, int8_t polarity);
1529
1530 void add(const UChar32* other, int32_t otherLen, int8_t polarity);
1531
1532 void retain(const UChar32* other, int32_t otherLen, int8_t polarity);
1533
1534 /**
1535 * Return true if the given position, in the given pattern, appears
1536 * to be the start of a property set pattern [:foo:], \\p{foo}, or
1537 * \\P{foo}, or \\N{name}.
1538 */
1539 static UBool resemblesPropertyPattern(const UnicodeString& pattern,
1540 int32_t pos);
1541
1542 static UBool resemblesPropertyPattern(RuleCharacterIterator& chars,
1543 int32_t iterOpts);
1544
1545 /**
1546 * Parse the given property pattern at the given parse position
1547 * and set this UnicodeSet to the result.
1548 *
1549 * The original design document is out of date, but still useful.
1550 * Ignore the property and value names:
1551 * http://source.icu-project.org/repos/icu/icuhtml/trunk/design/unicodeset_properties.html
1552 *
1553 * Recognized syntax:
1554 *
1555 * [:foo:] [:^foo:] - white space not allowed within "[:" or ":]"
1556 * \\p{foo} \\P{foo} - white space not allowed within "\\p" or "\\P"
1557 * \\N{name} - white space not allowed within "\\N"
1558 *
1559 * Other than the above restrictions, Unicode Pattern_White_Space characters are ignored.
1560 * Case is ignored except in "\\p" and "\\P" and "\\N". In 'name' leading
1561 * and trailing space is deleted, and internal runs of whitespace
1562 * are collapsed to a single space.
1563 *
1564 * We support binary properties, enumerated properties, and the
1565 * following non-enumerated properties:
1566 *
1567 * Numeric_Value
1568 * Name
1569 * Unicode_1_Name
1570 *
1571 * @param pattern the pattern string
1572 * @param ppos on entry, the position at which to begin parsing.
1573 * This should be one of the locations marked '^':
1574 *
1575 * [:blah:] \\p{blah} \\P{blah} \\N{name}
1576 * ^ % ^ % ^ % ^ %
1577 *
1578 * On return, the position after the last character parsed, that is,
1579 * the locations marked '%'. If the parse fails, ppos is returned
1580 * unchanged.
1581 * @param ec status
1582 * @return a reference to this.
1583 */
1584 UnicodeSet& applyPropertyPattern(const UnicodeString& pattern,
1585 ParsePosition& ppos,
1586 UErrorCode &ec);
1587
1588 void applyPropertyPattern(RuleCharacterIterator& chars,
1589 UnicodeString& rebuiltPat,
1590 UErrorCode& ec);
1591
1592 friend void UnicodeSet_initInclusion(int32_t src, UErrorCode &status);
1593 static const UnicodeSet* getInclusions(int32_t src, UErrorCode &status);
1594
1595 /**
1596 * A filter that returns TRUE if the given code point should be
1597 * included in the UnicodeSet being constructed.
1598 */
1599 typedef UBool (*Filter)(UChar32 codePoint, void* context);
1600
1601 /**
1602 * Given a filter, set this UnicodeSet to the code points
1603 * contained by that filter. The filter MUST be
1604 * property-conformant. That is, if it returns value v for one
1605 * code point, then it must return v for all affiliated code
1606 * points, as defined by the inclusions list. See
1607 * getInclusions().
1608 * src is a UPropertySource value.
1609 */
1610 void applyFilter(Filter filter,
1611 void* context,
1612 int32_t src,
1613 UErrorCode &status);
1614
1615 /**
1616 * Set the new pattern to cache.
1617 */
1618 void setPattern(const UnicodeString& newPat);
1619 /**
1620 * Release existing cached pattern.
1621 */
1622 void releasePattern();
1623
1624 friend class UnicodeSetIterator;
1625 };
1626
1627
1628
1629 inline UBool UnicodeSet::operator!=(const UnicodeSet& o) const {
1630 return !operator==(o);
1631 }
1632
1633 inline UBool UnicodeSet::isFrozen() const {
1634 return (UBool)(bmpSet!=NULL || stringSpan!=NULL);
1635 }
1636
1637 inline UBool UnicodeSet::containsSome(UChar32 start, UChar32 end) const {
1638 return !containsNone(start, end);
1639 }
1640
1641 inline UBool UnicodeSet::containsSome(const UnicodeSet& s) const {
1642 return !containsNone(s);
1643 }
1644
1645 inline UBool UnicodeSet::containsSome(const UnicodeString& s) const {
1646 return !containsNone(s);
1647 }
1648
1649 inline UBool UnicodeSet::isBogus() const {
1650 return (UBool)(fFlags & kIsBogus);
1651 }
1652
1653 inline UnicodeSet *UnicodeSet::fromUSet(USet *uset) {
1654 return reinterpret_cast<UnicodeSet *>(uset);
1655 }
1656
1657 inline const UnicodeSet *UnicodeSet::fromUSet(const USet *uset) {
1658 return reinterpret_cast<const UnicodeSet *>(uset);
1659 }
1660
1661 inline USet *UnicodeSet::toUSet() {
1662 return reinterpret_cast<USet *>(this);
1663 }
1664
1665 inline const USet *UnicodeSet::toUSet() const {
1666 return reinterpret_cast<const USet *>(this);
1667 }
1668
1669 inline int32_t UnicodeSet::span(const UnicodeString &s, int32_t start, USetSpanCondition spanCondition) const {
1670 int32_t sLength=s.length();
1671 if(start<0) {
1672 start=0;
1673 } else if(start>sLength) {
1674 start=sLength;
1675 }
1676 return start+span(s.getBuffer()+start, sLength-start, spanCondition);
1677 }
1678
1679 inline int32_t UnicodeSet::spanBack(const UnicodeString &s, int32_t limit, USetSpanCondition spanCondition) const {
1680 int32_t sLength=s.length();
1681 if(limit<0) {
1682 limit=0;
1683 } else if(limit>sLength) {
1684 limit=sLength;
1685 }
1686 return spanBack(s.getBuffer(), limit, spanCondition);
1687 }
1688
1689 U_NAMESPACE_END
1690
1691 #endif

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