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regex.h
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1 /*
2 **********************************************************************
3 * Copyright (C) 2002-2015, International Business Machines
4 * Corporation and others. All Rights Reserved.
5 **********************************************************************
6 * file name: regex.h
7 * encoding: US-ASCII
8 * indentation:4
9 *
10 * created on: 2002oct22
11 * created by: Andy Heninger
12 *
13 * ICU Regular Expressions, API for C++
14 */
15
16 #ifndef REGEX_H
17 #define REGEX_H
18
19 //#define REGEX_DEBUG
20
45 #include "unicode/utypes.h"
46
47 #if !UCONFIG_NO_REGULAR_EXPRESSIONS
48
49 #include "unicode/uobject.h"
50 #include "unicode/unistr.h"
51 #include "unicode/utext.h"
52 #include "unicode/parseerr.h"
53
54 #include "unicode/uregex.h"
55
56 // Forward Declarations
57
58 struct UHashtable;
59
60 U_NAMESPACE_BEGIN
61
62 struct Regex8BitSet;
63 class RegexCImpl;
64 class RegexMatcher;
65 class RegexPattern;
66 struct REStackFrame;
67 class RuleBasedBreakIterator;
68 class UnicodeSet;
69 class UVector;
70 class UVector32;
71 class UVector64;
72
73
85 class U_I18N_API RegexPattern U_FINAL : public UObject {
86 public:
87
95 RegexPattern();
96
103 RegexPattern(const RegexPattern &source);
104
110 virtual ~RegexPattern();
111
120 UBool operator==(const RegexPattern& that) const;
121
130 inline UBool operator!=(const RegexPattern& that) const {return ! operator ==(that);}
131
137 RegexPattern &operator =(const RegexPattern &source);
138
146 virtual RegexPattern *clone() const;
147
148
173 static RegexPattern * U_EXPORT2 compile( const UnicodeString &regex,
174 UParseError &pe,
175 UErrorCode &status);
176
203 static RegexPattern * U_EXPORT2 compile( UText *regex,
204 UParseError &pe,
205 UErrorCode &status);
206
231 static RegexPattern * U_EXPORT2 compile( const UnicodeString &regex,
232 uint32_t flags,
233 UParseError &pe,
234 UErrorCode &status);
235
262 static RegexPattern * U_EXPORT2 compile( UText *regex,
263 uint32_t flags,
264 UParseError &pe,
265 UErrorCode &status);
266
289 static RegexPattern * U_EXPORT2 compile( const UnicodeString &regex,
290 uint32_t flags,
291 UErrorCode &status);
292
317 static RegexPattern * U_EXPORT2 compile( UText *regex,
318 uint32_t flags,
319 UErrorCode &status);
320
326 virtual uint32_t flags() const;
327
345 virtual RegexMatcher *matcher(const UnicodeString &input,
346 UErrorCode &status) const;
347
348 private:
361 RegexMatcher *matcher(const UChar *input,
362 UErrorCode &status) const;
363 public:
364
365
377 virtual RegexMatcher *matcher(UErrorCode &status) const;
378
379
394 static UBool U_EXPORT2 matches(const UnicodeString &regex,
395 const UnicodeString &input,
396 UParseError &pe,
397 UErrorCode &status);
398
413 static UBool U_EXPORT2 matches(UText *regex,
414 UText *input,
415 UParseError &pe,
416 UErrorCode &status);
417
426 virtual UnicodeString pattern() const;
427
428
439 virtual UText *patternText(UErrorCode &status) const;
440
441
455 virtual int32_t groupNumberFromName(const UnicodeString &groupName, UErrorCode &status) const;
456
457
474 virtual int32_t groupNumberFromName(const char *groupName, int32_t nameLength, UErrorCode &status) const;
475
476
515 virtual int32_t split(const UnicodeString &input,
516 UnicodeString dest[],
517 int32_t destCapacity,
518 UErrorCode &status) const;
519
520
559 virtual int32_t split(UText *input,
560 UText *dest[],
561 int32_t destCapacity,
562 UErrorCode &status) const;
563
564
570 virtual UClassID getDynamicClassID() const;
571
577 static UClassID U_EXPORT2 getStaticClassID();
578
579 private:
580 //
581 // Implementation Data
582 //
583 UText *fPattern; // The original pattern string.
584 UnicodeString *fPatternString; // The original pattern UncodeString if relevant
585 uint32_t fFlags; // The flags used when compiling the pattern.
586 //
587 UVector64 *fCompiledPat; // The compiled pattern p-code.
588 UnicodeString fLiteralText; // Any literal string data from the pattern,
589 // after un-escaping, for use during the match.
590
591 UVector *fSets; // Any UnicodeSets referenced from the pattern.
592 Regex8BitSet *fSets8; // (and fast sets for latin-1 range.)
593
594
595 UErrorCode fDeferredStatus; // status if some prior error has left this
596 // RegexPattern in an unusable state.
597
598 int32_t fMinMatchLen; // Minimum Match Length. All matches will have length
599 // >= this value. For some patterns, this calculated
600 // value may be less than the true shortest
601 // possible match.
602
603 int32_t fFrameSize; // Size of a state stack frame in the
604 // execution engine.
605
606 int32_t fDataSize; // The size of the data needed by the pattern that
607 // does not go on the state stack, but has just
608 // a single copy per matcher.
609
610 UVector32 *fGroupMap; // Map from capture group number to position of
611 // the group's variables in the matcher stack frame.
612
613 UnicodeSet **fStaticSets; // Ptr to static (shared) sets for predefined
614 // regex character classes, e.g. Word.
615
616 Regex8BitSet *fStaticSets8; // Ptr to the static (shared) latin-1 only
617 // sets for predefined regex classes.
618
619 int32_t fStartType; // Info on how a match must start.
620 int32_t fInitialStringIdx; //
621 int32_t fInitialStringLen;
622 UnicodeSet *fInitialChars;
623 UChar32 fInitialChar;
624 Regex8BitSet *fInitialChars8;
625 UBool fNeedsAltInput;
626
627 UHashtable *fNamedCaptureMap; // Map from capture group names to numbers.
628
629 friend class RegexCompile;
630 friend class RegexMatcher;
631 friend class RegexCImpl;
632
633 //
634 // Implementation Methods
635 //
636 void init(); // Common initialization, for use by constructors.
637 void zap(); // Common cleanup
638
639 void dumpOp(int32_t index) const;
640
641 public:
642 #ifndef U_HIDE_INTERNAL_API
643
647 void dumpPattern() const;
648 #endif /* U_HIDE_INTERNAL_API */
649 };
650
651
652
662 class U_I18N_API RegexMatcher U_FINAL : public UObject {
663 public:
664
679 RegexMatcher(const UnicodeString &regexp, uint32_t flags, UErrorCode &status);
680
696 RegexMatcher(UText *regexp, uint32_t flags, UErrorCode &status);
697
719 RegexMatcher(const UnicodeString &regexp, const UnicodeString &input,
720 uint32_t flags, UErrorCode &status);
721
743 RegexMatcher(UText *regexp, UText *input,
744 uint32_t flags, UErrorCode &status);
745
746 private:
759 RegexMatcher(const UnicodeString &regexp, const UChar *input,
760 uint32_t flags, UErrorCode &status);
761 public:
762
763
769 virtual ~RegexMatcher();
770
771
778 virtual UBool matches(UErrorCode &status);
779
780
791 virtual UBool matches(int64_t startIndex, UErrorCode &status);
792
793
807 virtual UBool lookingAt(UErrorCode &status);
808
809
823 virtual UBool lookingAt(int64_t startIndex, UErrorCode &status);
824
825
838 virtual UBool find();
839
840
854 virtual UBool find(UErrorCode &status);
855
865 virtual UBool find(int64_t start, UErrorCode &status);
866
867
877 virtual UnicodeString group(UErrorCode &status) const;
878
879
892 virtual UnicodeString group(int32_t groupNum, UErrorCode &status) const;
893
899 virtual int32_t groupCount() const;
900
901
916 virtual UText *group(UText *dest, int64_t &group_len, UErrorCode &status) const;
917
933 virtual UText *group(int32_t groupNum, UText *dest, int64_t &group_len, UErrorCode &status) const;
934
942 virtual int32_t start(UErrorCode &status) const;
943
951 virtual int64_t start64(UErrorCode &status) const;
952
953
967 virtual int32_t start(int32_t group, UErrorCode &status) const;
968
982 virtual int64_t start64(int32_t group, UErrorCode &status) const;
983
997 virtual int32_t end(UErrorCode &status) const;
998
1012 virtual int64_t end64(UErrorCode &status) const;
1013
1014
1032 virtual int32_t end(int32_t group, UErrorCode &status) const;
1033
1051 virtual int64_t end64(int32_t group, UErrorCode &status) const;
1052
1061 virtual RegexMatcher &reset();
1062
1063
1079 virtual RegexMatcher &reset(int64_t index, UErrorCode &status);
1080
1081
1099 virtual RegexMatcher &reset(const UnicodeString &input);
1100
1101
1115 virtual RegexMatcher &reset(UText *input);
1116
1117
1142 virtual RegexMatcher &refreshInputText(UText *input, UErrorCode &status);
1143
1144 private:
1157 RegexMatcher &reset(const UChar *input);
1158 public:
1159
1167 virtual const UnicodeString &input() const;
1168
1177 virtual UText *inputText() const;
1178
1189 virtual UText *getInput(UText *dest, UErrorCode &status) const;
1190
1191
1210 virtual RegexMatcher &region(int64_t start, int64_t limit, UErrorCode &status);
1211
1223 virtual RegexMatcher &region(int64_t regionStart, int64_t regionLimit, int64_t startIndex, UErrorCode &status);
1224
1233 virtual int32_t regionStart() const;
1234
1243 virtual int64_t regionStart64() const;
1244
1245
1254 virtual int32_t regionEnd() const;
1255
1264 virtual int64_t regionEnd64() const;
1265
1274 virtual UBool hasTransparentBounds() const;
1275
1294 virtual RegexMatcher &useTransparentBounds(UBool b);
1295
1296
1304 virtual UBool hasAnchoringBounds() const;
1305
1306
1319 virtual RegexMatcher &useAnchoringBounds(UBool b);
1320
1321
1334 virtual UBool hitEnd() const;
1335
1345 virtual UBool requireEnd() const;
1346
1347
1353 virtual const RegexPattern &pattern() const;
1354
1355
1372 virtual UnicodeString replaceAll(const UnicodeString &replacement, UErrorCode &status);
1373
1374
1395 virtual UText *replaceAll(UText *replacement, UText *dest, UErrorCode &status);
1396
1397
1418 virtual UnicodeString replaceFirst(const UnicodeString &replacement, UErrorCode &status);
1419
1420
1445 virtual UText *replaceFirst(UText *replacement, UText *dest, UErrorCode &status);
1446
1447
1475 virtual RegexMatcher &appendReplacement(UnicodeString &dest,
1476 const UnicodeString &replacement, UErrorCode &status);
1477
1478
1506 virtual RegexMatcher &appendReplacement(UText *dest,
1507 UText *replacement, UErrorCode &status);
1508
1509
1520 virtual UnicodeString &appendTail(UnicodeString &dest);
1521
1522
1536 virtual UText *appendTail(UText *dest, UErrorCode &status);
1537
1538
1562 virtual int32_t split(const UnicodeString &input,
1563 UnicodeString dest[],
1564 int32_t destCapacity,
1565 UErrorCode &status);
1566
1567
1591 virtual int32_t split(UText *input,
1592 UText *dest[],
1593 int32_t destCapacity,
1594 UErrorCode &status);
1595
1617 virtual void setTimeLimit(int32_t limit, UErrorCode &status);
1618
1625 virtual int32_t getTimeLimit() const;
1626
1648 virtual void setStackLimit(int32_t limit, UErrorCode &status);
1649
1657 virtual int32_t getStackLimit() const;
1658
1659
1673 virtual void setMatchCallback(URegexMatchCallback *callback,
1674 const void *context,
1675 UErrorCode &status);
1676
1677
1688 virtual void getMatchCallback(URegexMatchCallback *&callback,
1689 const void *&context,
1690 UErrorCode &status);
1691
1692
1706 virtual void setFindProgressCallback(URegexFindProgressCallback *callback,
1707 const void *context,
1708 UErrorCode &status);
1709
1710
1721 virtual void getFindProgressCallback(URegexFindProgressCallback *&callback,
1722 const void *&context,
1723 UErrorCode &status);
1724
1725 #ifndef U_HIDE_INTERNAL_API
1726
1731 void setTrace(UBool state);
1732 #endif /* U_HIDE_INTERNAL_API */
1733
1739 static UClassID U_EXPORT2 getStaticClassID();
1740
1746 virtual UClassID getDynamicClassID() const;
1747
1748 private:
1749 // Constructors and other object boilerplate are private.
1750 // Instances of RegexMatcher can not be assigned, copied, cloned, etc.
1751 RegexMatcher(); // default constructor not implemented
1752 RegexMatcher(const RegexPattern *pat);
1753 RegexMatcher(const RegexMatcher &other);
1754 RegexMatcher &operator =(const RegexMatcher &rhs);
1755 void init(UErrorCode &status); // Common initialization
1756 void init2(UText *t, UErrorCode &e); // Common initialization, part 2.
1757
1758 friend class RegexPattern;
1759 friend class RegexCImpl;
1760 public:
1761 #ifndef U_HIDE_INTERNAL_API
1762
1763 void resetPreserveRegion(); // Reset matcher state, but preserve any region.
1764 #endif /* U_HIDE_INTERNAL_API */
1765 private:
1766
1767 //
1768 // MatchAt This is the internal interface to the match engine itself.
1769 // Match status comes back in matcher member variables.
1770 //
1771 void MatchAt(int64_t startIdx, UBool toEnd, UErrorCode &status);
1772 inline void backTrack(int64_t &inputIdx, int32_t &patIdx);
1773 UBool isWordBoundary(int64_t pos); // perform Perl-like \b test
1774 UBool isUWordBoundary(int64_t pos); // perform RBBI based \b test
1775 REStackFrame *resetStack();
1776 inline REStackFrame *StateSave(REStackFrame *fp, int64_t savePatIdx, UErrorCode &status);
1777 void IncrementTime(UErrorCode &status);
1778
1779 // Call user find callback function, if set. Return TRUE if operation should be interrupted.
1780 inline UBool findProgressInterrupt(int64_t matchIndex, UErrorCode &status);
1781
1782 int64_t appendGroup(int32_t groupNum, UText *dest, UErrorCode &status) const;
1783
1784 UBool findUsingChunk(UErrorCode &status);
1785 void MatchChunkAt(int32_t startIdx, UBool toEnd, UErrorCode &status);
1786 UBool isChunkWordBoundary(int32_t pos);
1787
1788 const RegexPattern *fPattern;
1789 RegexPattern *fPatternOwned; // Non-NULL if this matcher owns the pattern, and
1790 // should delete it when through.
1791
1792 const UnicodeString *fInput; // The string being matched. Only used for input()
1793 UText *fInputText; // The text being matched. Is never NULL.
1794 UText *fAltInputText; // A shallow copy of the text being matched.
1795 // Only created if the pattern contains backreferences.
1796 int64_t fInputLength; // Full length of the input text.
1797 int32_t fFrameSize; // The size of a frame in the backtrack stack.
1798
1799 int64_t fRegionStart; // Start of the input region, default = 0.
1800 int64_t fRegionLimit; // End of input region, default to input.length.
1801
1802 int64_t fAnchorStart; // Region bounds for anchoring operations (^ or $).
1803 int64_t fAnchorLimit; // See useAnchoringBounds
1804
1805 int64_t fLookStart; // Region bounds for look-ahead/behind and
1806 int64_t fLookLimit; // and other boundary tests. See
1807 // useTransparentBounds
1808
1809 int64_t fActiveStart; // Currently active bounds for matching.
1810 int64_t fActiveLimit; // Usually is the same as region, but
1811 // is changed to fLookStart/Limit when
1812 // entering look around regions.
1813
1814 UBool fTransparentBounds; // True if using transparent bounds.
1815 UBool fAnchoringBounds; // True if using anchoring bounds.
1816
1817 UBool fMatch; // True if the last attempted match was successful.
1818 int64_t fMatchStart; // Position of the start of the most recent match
1819 int64_t fMatchEnd; // First position after the end of the most recent match
1820 // Zero if no previous match, even when a region
1821 // is active.
1822 int64_t fLastMatchEnd; // First position after the end of the previous match,
1823 // or -1 if there was no previous match.
1824 int64_t fAppendPosition; // First position after the end of the previous
1825 // appendReplacement(). As described by the
1826 // JavaDoc for Java Matcher, where it is called
1827 // "append position"
1828 UBool fHitEnd; // True if the last match touched the end of input.
1829 UBool fRequireEnd; // True if the last match required end-of-input
1830 // (matched $ or Z)
1831
1832 UVector64 *fStack;
1833 REStackFrame *fFrame; // After finding a match, the last active stack frame,
1834 // which will contain the capture group results.
1835 // NOT valid while match engine is running.
1836
1837 int64_t *fData; // Data area for use by the compiled pattern.
1838 int64_t fSmallData[8]; // Use this for data if it's enough.
1839
1840 int32_t fTimeLimit; // Max time (in arbitrary steps) to let the
1841 // match engine run. Zero for unlimited.
1842
1843 int32_t fTime; // Match time, accumulates while matching.
1844 int32_t fTickCounter; // Low bits counter for time. Counts down StateSaves.
1845 // Kept separately from fTime to keep as much
1846 // code as possible out of the inline
1847 // StateSave function.
1848
1849 int32_t fStackLimit; // Maximum memory size to use for the backtrack
1850 // stack, in bytes. Zero for unlimited.
1851
1852 URegexMatchCallback *fCallbackFn; // Pointer to match progress callback funct.
1853 // NULL if there is no callback.
1854 const void *fCallbackContext; // User Context ptr for callback function.
1855
1856 URegexFindProgressCallback *fFindProgressCallbackFn; // Pointer to match progress callback funct.
1857 // NULL if there is no callback.
1858 const void *fFindProgressCallbackContext; // User Context ptr for callback function.
1859
1860
1861 UBool fInputUniStrMaybeMutable; // Set when fInputText wraps a UnicodeString that may be mutable - compatibility.
1862
1863 UBool fTraceDebug; // Set true for debug tracing of match engine.
1864
1865 UErrorCode fDeferredStatus; // Save error state that cannot be immediately
1866 // reported, or that permanently disables this matcher.
1867
1868 RuleBasedBreakIterator *fWordBreakItr;
1869 };
1870
1871 U_NAMESPACE_END
1872 #endif // UCONFIG_NO_REGULAR_EXPRESSIONS
1873 #endif