Index: public/i18n/unicode/bmsearch.h |
diff --git a/public/i18n/unicode/bmsearch.h b/public/i18n/unicode/bmsearch.h |
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-/* |
- ****************************************************************************** |
- * Copyright (C) 1996-2010, International Business Machines * |
- * Corporation and others. All Rights Reserved. * |
- ****************************************************************************** |
- */ |
- |
-/** |
- * \file |
- * \brief C++ API: Boyer-Moore StringSearch technology preview |
- * \internal ICU 4.0.1 technology preview |
- */ |
- |
-#ifndef B_M_SEARCH_H |
-#define B_M_SEARCH_H |
- |
-#include "unicode/utypes.h" |
- |
-#if !UCONFIG_NO_COLLATION && !UCONFIG_NO_BREAK_ITERATION |
- |
-#include "unicode/uobject.h" |
-#include "unicode/ucol.h" |
- |
-#include "unicode/colldata.h" |
- |
-U_NAMESPACE_BEGIN |
- |
-class BadCharacterTable; |
-class GoodSuffixTable; |
-class Target; |
- |
-/** |
- * BoyerMooreSearch |
- * |
- * This object holds the information needed to do a Collation sensitive Boyer-Moore search. It encapulates |
- * the pattern, the "bad character" and "good suffix" tables, the Collator-based data needed to compute them, |
- * and a reference to the text being searched. |
- * |
- * To do a search, you fist need to get a <code>CollData</code> object by calling <code>CollData::open</code>. |
- * Then you construct a <code>BoyerMooreSearch</code> object from the <code>CollData</code> object, the pattern |
- * string and the target string. Then you call the <code>search</code> method. Here's a code sample: |
- * |
- * <pre> |
- * void boyerMooreExample(UCollator *collator, UnicodeString *pattern, UnicodeString *target) |
- * { |
- * UErrorCode status = U_ZERO_ERROR; |
- * CollData *collData = CollData::open(collator, status); |
- * |
- * if (U_FAILURE(status)) { |
- * // could not create a CollData object |
- * return; |
- * } |
- * |
- * BoyerMooreSearch *search = new BoyerMooreSearch(collData, *patternString, target, status); |
- * |
- * if (U_FAILURE(status)) { |
- * // could not create a BoyerMooreSearch object |
- * CollData::close(collData); |
- * return; |
- * } |
- * |
- * int32_t offset = 0, start = -1, end = -1; |
- * |
- * // Find all matches |
- * while (search->search(offset, start, end)) { |
- * // process the match between start and end |
- * ... |
- * // advance past the match |
- * offset = end; |
- * } |
- * |
- * // at this point, if offset == 0, there were no matches |
- * if (offset == 0) { |
- * // handle the case of no matches |
- * } |
- * |
- * delete search; |
- * CollData::close(collData); |
- * |
- * // CollData objects are cached, so the call to |
- * // CollData::close doesn't delete the object. |
- * // Call this if you don't need the object any more. |
- * CollData::flushCollDataCache(); |
- * } |
- * </pre> |
- * |
- * NOTE: This is a technology preview. The final version of this API may not bear any resenblence to this API. |
- * |
- * Knows linitations: |
- * 1) Backwards searching has not been implemented. |
- * |
- * 2) For Han and Hangul characters, this code ignores any Collation tailorings. In general, |
- * this isn't a problem, but in Korean locals, at strength 1, Hangul characters are tailored |
- * to be equal to Han characters with the same pronounciation. Because this code ignroes |
- * tailorings, searching for a Hangul character will not find a Han character and visa-versa. |
- * |
- * 3) In some cases, searching for a pattern that needs to be normalized and ends |
- * in a discontiguous contraction may fail. The only known cases of this are with |
- * the Tibetan script. For example searching for the pattern |
- * "\u0F7F\u0F80\u0F81\u0F82\u0F83\u0F84\u0F85" will fail. (This case is artificial. We've |
- * been unable to find a pratical, real-world example of this failure.) |
- * |
- * @internal ICU 4.0.1 technology preview |
- * |
- * @see CollData |
- */ |
-class U_I18N_API BoyerMooreSearch : public UObject |
-{ |
-public: |
- /** |
- * Construct a <code>BoyerMooreSearch</code> object. |
- * |
- * @param theData - A <code>CollData</code> object holding the Collator-sensitive data |
- * @param patternString - the string for which to search |
- * @param targetString - the string in which to search or <code>NULL</code> if youu will |
- * set it later by calling <code>setTargetString</code>. |
- * @param status - will be set if any errors occur. |
- * |
- * Note: if on return, status is set to an error code, |
- * the only safe thing to do with this object is to call |
- * the destructor. |
- * |
- * @internal ICU 4.0.1 technology preview |
- */ |
- BoyerMooreSearch(CollData *theData, const UnicodeString &patternString, const UnicodeString *targetString, UErrorCode &status); |
- |
- /** |
- * The desstructor |
- * |
- * @internal ICU 4.0.1 technology preview |
- */ |
- ~BoyerMooreSearch(); |
- |
- /** |
- * Test the pattern to see if it generates any CEs. |
- * |
- * @return <code>TRUE</code> if the pattern string did not generate any CEs |
- * |
- * @internal ICU 4.0.1 technology preview |
- */ |
- UBool empty(); |
- |
- /** |
- * Search for the pattern string in the target string. |
- * |
- * @param offset - the offset in the target string at which to begin the search |
- * @param start - will be set to the starting offset of the match, or -1 if there's no match |
- * @param end - will be set to the ending offset of the match, or -1 if there's no match |
- * |
- * @return <code>TRUE</code> if the match succeeds, <code>FALSE</code> otherwise. |
- * |
- * @internal ICU 4.0.1 technology preview |
- */ |
- UBool search(int32_t offset, int32_t &start, int32_t &end); |
- |
- /** |
- * Set the target string for the match. |
- * |
- * @param targetString - the new target string |
- * @param status - will be set if any errors occur. |
- * |
- * @internal ICU 4.0.1 technology preview |
- */ |
- void setTargetString(const UnicodeString *targetString, UErrorCode &status); |
- |
- // **** no longer need these? **** |
- /** |
- * Return the <code>CollData</code> object used for searching |
- * |
- * @return the <code>CollData</code> object used for searching |
- * |
- * @internal ICU 4.0.1 technology preview |
- */ |
- CollData *getData(); |
- |
- /** |
- * Return the CEs generated by the pattern string. |
- * |
- * @return a <code>CEList</code> object holding the CEs generated by the pattern string. |
- * |
- * @internal ICU 4.0.1 technology preview |
- */ |
- CEList *getPatternCEs(); |
- |
- /** |
- * Return the <code>BadCharacterTable</code> object computed for the pattern string. |
- * |
- * @return the <code>BadCharacterTable</code> object. |
- * |
- * @internal ICU 4.0.1 technology preview |
- */ |
- BadCharacterTable *getBadCharacterTable(); |
- |
- /** |
- * Return the <code>GoodSuffixTable</code> object computed for the pattern string. |
- * |
- * @return the <code>GoodSuffixTable</code> object computed for the pattern string. |
- * |
- * @internal ICU 4.0.1 technology preview |
- */ |
- GoodSuffixTable *getGoodSuffixTable(); |
- |
- /** |
- * UObject glue... |
- * @internal ICU 4.0.1 technology preview |
- */ |
- virtual UClassID getDynamicClassID() const; |
- /** |
- * UObject glue... |
- * @internal ICU 4.0.1 technology preview |
- */ |
- static UClassID getStaticClassID(); |
- |
-private: |
- CollData *data; |
- CEList *patCEs; |
- BadCharacterTable *badCharacterTable; |
- GoodSuffixTable *goodSuffixTable; |
- UnicodeString pattern; |
- Target *target; |
-}; |
- |
-U_NAMESPACE_END |
- |
-#endif // #if !UCONFIG_NO_COLLATION |
-#endif // #ifndef B_M_SEARCH_H |