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diff --git a/intl/icu/source/i18n/unicode/coll.h b/intl/icu/source/i18n/unicode/coll.h new file mode 100644 index 0000000000..fc5af95349 --- /dev/null +++ b/intl/icu/source/i18n/unicode/coll.h @@ -0,0 +1,1294 @@ +// © 2016 and later: Unicode, Inc. and others. +// License & terms of use: http://www.unicode.org/copyright.html +/* +****************************************************************************** +* Copyright (C) 1996-2016, International Business Machines +* Corporation and others. All Rights Reserved. +****************************************************************************** +*/ + +/** + * \file + * \brief C++ API: Collation Service. + */ + +/** +* File coll.h +* +* Created by: Helena Shih +* +* Modification History: +* +* Date Name Description +* 02/5/97 aliu Modified createDefault to load collation data from +* binary files when possible. Added related methods +* createCollationFromFile, chopLocale, createPathName. +* 02/11/97 aliu Added members addToCache, findInCache, and fgCache. +* 02/12/97 aliu Modified to create objects from RuleBasedCollator cache. +* Moved cache out of Collation class. +* 02/13/97 aliu Moved several methods out of this class and into +* RuleBasedCollator, with modifications. Modified +* createDefault() to call new RuleBasedCollator(Locale&) +* constructor. General clean up and documentation. +* 02/20/97 helena Added clone, operator==, operator!=, operator=, copy +* constructor and getDynamicClassID. +* 03/25/97 helena Updated with platform independent data types. +* 05/06/97 helena Added memory allocation error detection. +* 06/20/97 helena Java class name change. +* 09/03/97 helena Added createCollationKeyValues(). +* 02/10/98 damiba Added compare() with length as parameter. +* 04/23/99 stephen Removed EDecompositionMode, merged with +* Normalizer::EMode. +* 11/02/99 helena Collator performance enhancements. Eliminates the +* UnicodeString construction and special case for NO_OP. +* 11/23/99 srl More performance enhancements. Inlining of +* critical accessors. +* 05/15/00 helena Added version information API. +* 01/29/01 synwee Modified into a C++ wrapper which calls C apis +* (ucol.h). +* 2012-2014 markus Rewritten in C++ again. +*/ + +#ifndef COLL_H +#define COLL_H + +#include "unicode/utypes.h" + +#if U_SHOW_CPLUSPLUS_API + +#if !UCONFIG_NO_COLLATION + +#include "unicode/uobject.h" +#include "unicode/ucol.h" +#include "unicode/unorm.h" +#include "unicode/locid.h" +#include "unicode/uniset.h" +#include "unicode/umisc.h" +#include "unicode/uiter.h" +#include "unicode/stringpiece.h" + +U_NAMESPACE_BEGIN + +class StringEnumeration; + +#if !UCONFIG_NO_SERVICE +/** + * @stable ICU 2.6 + */ +class CollatorFactory; +#endif + +/** +* @stable ICU 2.0 +*/ +class CollationKey; + +/** +* The <code>Collator</code> class performs locale-sensitive string +* comparison.<br> +* You use this class to build searching and sorting routines for natural +* language text. +* <p> +* <code>Collator</code> is an abstract base class. Subclasses implement +* specific collation strategies. One subclass, +* <code>RuleBasedCollator</code>, is currently provided and is applicable +* to a wide set of languages. Other subclasses may be created to handle more +* specialized needs. +* <p> +* Like other locale-sensitive classes, you can use the static factory method, +* <code>createInstance</code>, to obtain the appropriate +* <code>Collator</code> object for a given locale. You will only need to +* look at the subclasses of <code>Collator</code> if you need to +* understand the details of a particular collation strategy or if you need to +* modify that strategy. +* <p> +* The following example shows how to compare two strings using the +* <code>Collator</code> for the default locale. +* \htmlonly<blockquote>\endhtmlonly +* <pre> +* \code +* // Compare two strings in the default locale +* UErrorCode success = U_ZERO_ERROR; +* Collator* myCollator = Collator::createInstance(success); +* if (myCollator->compare("abc", "ABC") < 0) +* cout << "abc is less than ABC" << endl; +* else +* cout << "abc is greater than or equal to ABC" << endl; +* \endcode +* </pre> +* \htmlonly</blockquote>\endhtmlonly +* <p> +* You can set a <code>Collator</code>'s <em>strength</em> attribute to +* determine the level of difference considered significant in comparisons. +* Five strengths are provided: <code>PRIMARY</code>, <code>SECONDARY</code>, +* <code>TERTIARY</code>, <code>QUATERNARY</code> and <code>IDENTICAL</code>. +* The exact assignment of strengths to language features is locale dependent. +* For example, in Czech, "e" and "f" are considered primary differences, +* while "e" and "\u00EA" are secondary differences, "e" and "E" are tertiary +* differences and "e" and "e" are identical. The following shows how both case +* and accents could be ignored for US English. +* \htmlonly<blockquote>\endhtmlonly +* <pre> +* \code +* //Get the Collator for US English and set its strength to PRIMARY +* UErrorCode success = U_ZERO_ERROR; +* Collator* usCollator = Collator::createInstance(Locale::getUS(), success); +* usCollator->setStrength(Collator::PRIMARY); +* if (usCollator->compare("abc", "ABC") == 0) +* cout << "'abc' and 'ABC' strings are equivalent with strength PRIMARY" << endl; +* \endcode +* </pre> +* \htmlonly</blockquote>\endhtmlonly +* +* The <code>getSortKey</code> methods +* convert a string to a series of bytes that can be compared bitwise against +* other sort keys using <code>strcmp()</code>. Sort keys are written as +* zero-terminated byte strings. +* +* Another set of APIs returns a <code>CollationKey</code> object that wraps +* the sort key bytes instead of returning the bytes themselves. +* </p> +* <p> +* <strong>Note:</strong> <code>Collator</code>s with different Locale, +* and CollationStrength settings will return different sort +* orders for the same set of strings. Locales have specific collation rules, +* and the way in which secondary and tertiary differences are taken into +* account, for example, will result in a different sorting order for same +* strings. +* </p> +* @see RuleBasedCollator +* @see CollationKey +* @see CollationElementIterator +* @see Locale +* @see Normalizer2 +* @version 2.0 11/15/01 +*/ + +class U_I18N_API Collator : public UObject { +public: + + // Collator public enums ----------------------------------------------- + + /** + * Base letter represents a primary difference. Set comparison level to + * PRIMARY to ignore secondary and tertiary differences.<br> + * Use this to set the strength of a Collator object.<br> + * Example of primary difference, "abc" < "abd" + * + * Diacritical differences on the same base letter represent a secondary + * difference. Set comparison level to SECONDARY to ignore tertiary + * differences. Use this to set the strength of a Collator object.<br> + * Example of secondary difference, "ä" >> "a". + * + * Uppercase and lowercase versions of the same character represents a + * tertiary difference. Set comparison level to TERTIARY to include all + * comparison differences. Use this to set the strength of a Collator + * object.<br> + * Example of tertiary difference, "abc" <<< "ABC". + * + * Two characters are considered "identical" when they have the same unicode + * spellings.<br> + * For example, "ä" == "ä". + * + * UCollationStrength is also used to determine the strength of sort keys + * generated from Collator objects. + * @stable ICU 2.0 + */ + enum ECollationStrength + { + PRIMARY = UCOL_PRIMARY, // 0 + SECONDARY = UCOL_SECONDARY, // 1 + TERTIARY = UCOL_TERTIARY, // 2 + QUATERNARY = UCOL_QUATERNARY, // 3 + IDENTICAL = UCOL_IDENTICAL // 15 + }; + + + // Cannot use #ifndef U_HIDE_DEPRECATED_API for the following, it is + // used by virtual methods that cannot have that conditional. +#ifndef U_FORCE_HIDE_DEPRECATED_API + /** + * LESS is returned if source string is compared to be less than target + * string in the compare() method. + * EQUAL is returned if source string is compared to be equal to target + * string in the compare() method. + * GREATER is returned if source string is compared to be greater than + * target string in the compare() method. + * @see Collator#compare + * @deprecated ICU 2.6. Use C enum UCollationResult defined in ucol.h + */ + enum EComparisonResult + { + LESS = UCOL_LESS, // -1 + EQUAL = UCOL_EQUAL, // 0 + GREATER = UCOL_GREATER // 1 + }; +#endif // U_FORCE_HIDE_DEPRECATED_API + + // Collator public destructor ----------------------------------------- + + /** + * Destructor + * @stable ICU 2.0 + */ + virtual ~Collator(); + + // Collator public methods -------------------------------------------- + + /** + * Returns true if "other" is the same as "this". + * + * The base class implementation returns true if "other" has the same type/class as "this": + * `typeid(*this) == typeid(other)`. + * + * Subclass implementations should do something like the following: + * + * if (this == &other) { return true; } + * if (!Collator::operator==(other)) { return false; } // not the same class + * + * const MyCollator &o = (const MyCollator&)other; + * (compare this vs. o's subclass fields) + * + * @param other Collator object to be compared + * @return true if other is the same as this. + * @stable ICU 2.0 + */ + virtual bool operator==(const Collator& other) const; + + /** + * Returns true if "other" is not the same as "this". + * Calls ! operator==(const Collator&) const which works for all subclasses. + * @param other Collator object to be compared + * @return true if other is not the same as this. + * @stable ICU 2.0 + */ + virtual bool operator!=(const Collator& other) const; + + /** + * Makes a copy of this object. + * @return a copy of this object, owned by the caller + * @stable ICU 2.0 + */ + virtual Collator* clone() const = 0; + + /** + * Creates the Collator object for the current default locale. + * The default locale is determined by Locale::getDefault. + * The UErrorCode& err parameter is used to return status information to the user. + * To check whether the construction succeeded or not, you should check the + * value of U_SUCCESS(err). If you wish more detailed information, you can + * check for informational error results which still indicate success. + * U_USING_FALLBACK_ERROR indicates that a fall back locale was used. For + * example, 'de_CH' was requested, but nothing was found there, so 'de' was + * used. U_USING_DEFAULT_ERROR indicates that the default locale data was + * used; neither the requested locale nor any of its fall back locales + * could be found. + * The caller owns the returned object and is responsible for deleting it. + * + * @param err the error code status. + * @return the collation object of the default locale.(for example, en_US) + * @see Locale#getDefault + * @stable ICU 2.0 + */ + static Collator* U_EXPORT2 createInstance(UErrorCode& err); + + /** + * Gets the collation object for the desired locale. The + * resource of the desired locale will be loaded. + * + * Locale::getRoot() is the base collation table and all other languages are + * built on top of it with additional language-specific modifications. + * + * For some languages, multiple collation types are available; + * for example, "de@collation=phonebook". + * Starting with ICU 54, collation attributes can be specified via locale keywords as well, + * in the old locale extension syntax ("el@colCaseFirst=upper") + * or in language tag syntax ("el-u-kf-upper"). + * See <a href="https://unicode-org.github.io/icu/userguide/collation/api">User Guide: Collation API</a>. + * + * The UErrorCode& err parameter is used to return status information to the user. + * To check whether the construction succeeded or not, you should check + * the value of U_SUCCESS(err). If you wish more detailed information, you + * can check for informational error results which still indicate success. + * U_USING_FALLBACK_ERROR indicates that a fall back locale was used. For + * example, 'de_CH' was requested, but nothing was found there, so 'de' was + * used. U_USING_DEFAULT_ERROR indicates that the default locale data was + * used; neither the requested locale nor any of its fall back locales + * could be found. + * + * The caller owns the returned object and is responsible for deleting it. + * @param loc The locale ID for which to open a collator. + * @param err the error code status. + * @return the created table-based collation object based on the desired + * locale. + * @see Locale + * @see ResourceLoader + * @stable ICU 2.2 + */ + static Collator* U_EXPORT2 createInstance(const Locale& loc, UErrorCode& err); + +#ifndef U_FORCE_HIDE_DEPRECATED_API + /** + * The comparison function compares the character data stored in two + * different strings. Returns information about whether a string is less + * than, greater than or equal to another string. + * @param source the source string to be compared with. + * @param target the string that is to be compared with the source string. + * @return Returns a byte value. GREATER if source is greater + * than target; EQUAL if source is equal to target; LESS if source is less + * than target + * @deprecated ICU 2.6 use the overload with UErrorCode & + */ + virtual EComparisonResult compare(const UnicodeString& source, + const UnicodeString& target) const; +#endif // U_FORCE_HIDE_DEPRECATED_API + + /** + * The comparison function compares the character data stored in two + * different strings. Returns information about whether a string is less + * than, greater than or equal to another string. + * @param source the source string to be compared with. + * @param target the string that is to be compared with the source string. + * @param status possible error code + * @return Returns an enum value. UCOL_GREATER if source is greater + * than target; UCOL_EQUAL if source is equal to target; UCOL_LESS if source is less + * than target + * @stable ICU 2.6 + */ + virtual UCollationResult compare(const UnicodeString& source, + const UnicodeString& target, + UErrorCode &status) const = 0; + +#ifndef U_FORCE_HIDE_DEPRECATED_API + /** + * Does the same thing as compare but limits the comparison to a specified + * length + * @param source the source string to be compared with. + * @param target the string that is to be compared with the source string. + * @param length the length the comparison is limited to + * @return Returns a byte value. GREATER if source (up to the specified + * length) is greater than target; EQUAL if source (up to specified + * length) is equal to target; LESS if source (up to the specified + * length) is less than target. + * @deprecated ICU 2.6 use the overload with UErrorCode & + */ + virtual EComparisonResult compare(const UnicodeString& source, + const UnicodeString& target, + int32_t length) const; +#endif // U_FORCE_HIDE_DEPRECATED_API + + /** + * Does the same thing as compare but limits the comparison to a specified + * length + * @param source the source string to be compared with. + * @param target the string that is to be compared with the source string. + * @param length the length the comparison is limited to + * @param status possible error code + * @return Returns an enum value. UCOL_GREATER if source (up to the specified + * length) is greater than target; UCOL_EQUAL if source (up to specified + * length) is equal to target; UCOL_LESS if source (up to the specified + * length) is less than target. + * @stable ICU 2.6 + */ + virtual UCollationResult compare(const UnicodeString& source, + const UnicodeString& target, + int32_t length, + UErrorCode &status) const = 0; + +#ifndef U_FORCE_HIDE_DEPRECATED_API + /** + * The comparison function compares the character data stored in two + * different string arrays. Returns information about whether a string array + * is less than, greater than or equal to another string array. + * <p>Example of use: + * <pre> + * . char16_t ABC[] = {0x41, 0x42, 0x43, 0}; // = "ABC" + * . char16_t abc[] = {0x61, 0x62, 0x63, 0}; // = "abc" + * . UErrorCode status = U_ZERO_ERROR; + * . Collator *myCollation = + * . Collator::createInstance(Locale::getUS(), status); + * . if (U_FAILURE(status)) return; + * . myCollation->setStrength(Collator::PRIMARY); + * . // result would be Collator::EQUAL ("abc" == "ABC") + * . // (no primary difference between "abc" and "ABC") + * . Collator::EComparisonResult result = + * . myCollation->compare(abc, 3, ABC, 3); + * . myCollation->setStrength(Collator::TERTIARY); + * . // result would be Collator::LESS ("abc" <<< "ABC") + * . // (with tertiary difference between "abc" and "ABC") + * . result = myCollation->compare(abc, 3, ABC, 3); + * </pre> + * @param source the source string array to be compared with. + * @param sourceLength the length of the source string array. If this value + * is equal to -1, the string array is null-terminated. + * @param target the string that is to be compared with the source string. + * @param targetLength the length of the target string array. If this value + * is equal to -1, the string array is null-terminated. + * @return Returns a byte value. GREATER if source is greater than target; + * EQUAL if source is equal to target; LESS if source is less than + * target + * @deprecated ICU 2.6 use the overload with UErrorCode & + */ + virtual EComparisonResult compare(const char16_t* source, int32_t sourceLength, + const char16_t* target, int32_t targetLength) + const; +#endif // U_FORCE_HIDE_DEPRECATED_API + + /** + * The comparison function compares the character data stored in two + * different string arrays. Returns information about whether a string array + * is less than, greater than or equal to another string array. + * @param source the source string array to be compared with. + * @param sourceLength the length of the source string array. If this value + * is equal to -1, the string array is null-terminated. + * @param target the string that is to be compared with the source string. + * @param targetLength the length of the target string array. If this value + * is equal to -1, the string array is null-terminated. + * @param status possible error code + * @return Returns an enum value. UCOL_GREATER if source is greater + * than target; UCOL_EQUAL if source is equal to target; UCOL_LESS if source is less + * than target + * @stable ICU 2.6 + */ + virtual UCollationResult compare(const char16_t* source, int32_t sourceLength, + const char16_t* target, int32_t targetLength, + UErrorCode &status) const = 0; + + /** + * Compares two strings using the Collator. + * Returns whether the first one compares less than/equal to/greater than + * the second one. + * This version takes UCharIterator input. + * @param sIter the first ("source") string iterator + * @param tIter the second ("target") string iterator + * @param status ICU status + * @return UCOL_LESS, UCOL_EQUAL or UCOL_GREATER + * @stable ICU 4.2 + */ + virtual UCollationResult compare(UCharIterator &sIter, + UCharIterator &tIter, + UErrorCode &status) const; + + /** + * Compares two UTF-8 strings using the Collator. + * Returns whether the first one compares less than/equal to/greater than + * the second one. + * This version takes UTF-8 input. + * Note that a StringPiece can be implicitly constructed + * from a std::string or a NUL-terminated const char * string. + * @param source the first UTF-8 string + * @param target the second UTF-8 string + * @param status ICU status + * @return UCOL_LESS, UCOL_EQUAL or UCOL_GREATER + * @stable ICU 4.2 + */ + virtual UCollationResult compareUTF8(const StringPiece &source, + const StringPiece &target, + UErrorCode &status) const; + + /** + * Transforms the string into a series of characters that can be compared + * with CollationKey::compareTo. It is not possible to restore the original + * string from the chars in the sort key. + * <p>Use CollationKey::equals or CollationKey::compare to compare the + * generated sort keys. + * If the source string is null, a null collation key will be returned. + * + * Note that sort keys are often less efficient than simply doing comparison. + * For more details, see the ICU User Guide. + * + * @param source the source string to be transformed into a sort key. + * @param key the collation key to be filled in + * @param status the error code status. + * @return the collation key of the string based on the collation rules. + * @see CollationKey#compare + * @stable ICU 2.0 + */ + virtual CollationKey& getCollationKey(const UnicodeString& source, + CollationKey& key, + UErrorCode& status) const = 0; + + /** + * Transforms the string into a series of characters that can be compared + * with CollationKey::compareTo. It is not possible to restore the original + * string from the chars in the sort key. + * <p>Use CollationKey::equals or CollationKey::compare to compare the + * generated sort keys. + * <p>If the source string is null, a null collation key will be returned. + * + * Note that sort keys are often less efficient than simply doing comparison. + * For more details, see the ICU User Guide. + * + * @param source the source string to be transformed into a sort key. + * @param sourceLength length of the collation key + * @param key the collation key to be filled in + * @param status the error code status. + * @return the collation key of the string based on the collation rules. + * @see CollationKey#compare + * @stable ICU 2.0 + */ + virtual CollationKey& getCollationKey(const char16_t*source, + int32_t sourceLength, + CollationKey& key, + UErrorCode& status) const = 0; + /** + * Generates the hash code for the collation object + * @stable ICU 2.0 + */ + virtual int32_t hashCode(void) const = 0; + +#ifndef U_FORCE_HIDE_DEPRECATED_API + /** + * Gets the locale of the Collator + * + * @param type can be either requested, valid or actual locale. For more + * information see the definition of ULocDataLocaleType in + * uloc.h + * @param status the error code status. + * @return locale where the collation data lives. If the collator + * was instantiated from rules, locale is empty. + * @deprecated ICU 2.8 This API is under consideration for revision + * in ICU 3.0. + */ + virtual Locale getLocale(ULocDataLocaleType type, UErrorCode& status) const = 0; +#endif // U_FORCE_HIDE_DEPRECATED_API + + /** + * Convenience method for comparing two strings based on the collation rules. + * @param source the source string to be compared with. + * @param target the target string to be compared with. + * @return true if the first string is greater than the second one, + * according to the collation rules. false, otherwise. + * @see Collator#compare + * @stable ICU 2.0 + */ + UBool greater(const UnicodeString& source, const UnicodeString& target) + const; + + /** + * Convenience method for comparing two strings based on the collation rules. + * @param source the source string to be compared with. + * @param target the target string to be compared with. + * @return true if the first string is greater than or equal to the second + * one, according to the collation rules. false, otherwise. + * @see Collator#compare + * @stable ICU 2.0 + */ + UBool greaterOrEqual(const UnicodeString& source, + const UnicodeString& target) const; + + /** + * Convenience method for comparing two strings based on the collation rules. + * @param source the source string to be compared with. + * @param target the target string to be compared with. + * @return true if the strings are equal according to the collation rules. + * false, otherwise. + * @see Collator#compare + * @stable ICU 2.0 + */ + UBool equals(const UnicodeString& source, const UnicodeString& target) const; + +#ifndef U_FORCE_HIDE_DEPRECATED_API + /** + * Determines the minimum strength that will be used in comparison or + * transformation. + * <p>E.g. with strength == SECONDARY, the tertiary difference is ignored + * <p>E.g. with strength == PRIMARY, the secondary and tertiary difference + * are ignored. + * @return the current comparison level. + * @see Collator#setStrength + * @deprecated ICU 2.6 Use getAttribute(UCOL_STRENGTH...) instead + */ + virtual ECollationStrength getStrength(void) const; + + /** + * Sets the minimum strength to be used in comparison or transformation. + * <p>Example of use: + * <pre> + * \code + * UErrorCode status = U_ZERO_ERROR; + * Collator*myCollation = Collator::createInstance(Locale::getUS(), status); + * if (U_FAILURE(status)) return; + * myCollation->setStrength(Collator::PRIMARY); + * // result will be "abc" == "ABC" + * // tertiary differences will be ignored + * Collator::ComparisonResult result = myCollation->compare("abc", "ABC"); + * \endcode + * </pre> + * @see Collator#getStrength + * @param newStrength the new comparison level. + * @deprecated ICU 2.6 Use setAttribute(UCOL_STRENGTH...) instead + */ + virtual void setStrength(ECollationStrength newStrength); +#endif // U_FORCE_HIDE_DEPRECATED_API + + /** + * Retrieves the reordering codes for this collator. + * @param dest The array to fill with the script ordering. + * @param destCapacity The length of dest. If it is 0, then dest may be nullptr and the function + * will only return the length of the result without writing any codes (pre-flighting). + * @param status A reference to an error code value, which must not indicate + * a failure before the function call. + * @return The length of the script ordering array. + * @see ucol_setReorderCodes + * @see Collator#getEquivalentReorderCodes + * @see Collator#setReorderCodes + * @see UScriptCode + * @see UColReorderCode + * @stable ICU 4.8 + */ + virtual int32_t getReorderCodes(int32_t *dest, + int32_t destCapacity, + UErrorCode& status) const; + + /** + * Sets the ordering of scripts for this collator. + * + * <p>The reordering codes are a combination of script codes and reorder codes. + * @param reorderCodes An array of script codes in the new order. This can be nullptr if the + * length is also set to 0. An empty array will clear any reordering codes on the collator. + * @param reorderCodesLength The length of reorderCodes. + * @param status error code + * @see ucol_setReorderCodes + * @see Collator#getReorderCodes + * @see Collator#getEquivalentReorderCodes + * @see UScriptCode + * @see UColReorderCode + * @stable ICU 4.8 + */ + virtual void setReorderCodes(const int32_t* reorderCodes, + int32_t reorderCodesLength, + UErrorCode& status) ; + + /** + * Retrieves the reorder codes that are grouped with the given reorder code. Some reorder + * codes will be grouped and must reorder together. + * Beginning with ICU 55, scripts only reorder together if they are primary-equal, + * for example Hiragana and Katakana. + * + * @param reorderCode The reorder code to determine equivalence for. + * @param dest The array to fill with the script equivalence reordering codes. + * @param destCapacity The length of dest. If it is 0, then dest may be nullptr and the + * function will only return the length of the result without writing any codes (pre-flighting). + * @param status A reference to an error code value, which must not indicate + * a failure before the function call. + * @return The length of the of the reordering code equivalence array. + * @see ucol_setReorderCodes + * @see Collator#getReorderCodes + * @see Collator#setReorderCodes + * @see UScriptCode + * @see UColReorderCode + * @stable ICU 4.8 + */ + static int32_t U_EXPORT2 getEquivalentReorderCodes(int32_t reorderCode, + int32_t* dest, + int32_t destCapacity, + UErrorCode& status); + + /** + * Get name of the object for the desired Locale, in the desired language + * @param objectLocale must be from getAvailableLocales + * @param displayLocale specifies the desired locale for output + * @param name the fill-in parameter of the return value + * @return display-able name of the object for the object locale in the + * desired language + * @stable ICU 2.0 + */ + static UnicodeString& U_EXPORT2 getDisplayName(const Locale& objectLocale, + const Locale& displayLocale, + UnicodeString& name); + + /** + * Get name of the object for the desired Locale, in the language of the + * default locale. + * @param objectLocale must be from getAvailableLocales + * @param name the fill-in parameter of the return value + * @return name of the object for the desired locale in the default language + * @stable ICU 2.0 + */ + static UnicodeString& U_EXPORT2 getDisplayName(const Locale& objectLocale, + UnicodeString& name); + + /** + * Get the set of Locales for which Collations are installed. + * + * <p>Note this does not include locales supported by registered collators. + * If collators might have been registered, use the overload of getAvailableLocales + * that returns a StringEnumeration.</p> + * + * @param count the output parameter of number of elements in the locale list + * @return the list of available locales for which collations are installed + * @stable ICU 2.0 + */ + static const Locale* U_EXPORT2 getAvailableLocales(int32_t& count); + + /** + * Return a StringEnumeration over the locales available at the time of the call, + * including registered locales. If a severe error occurs (such as out of memory + * condition) this will return null. If there is no locale data, an empty enumeration + * will be returned. + * @return a StringEnumeration over the locales available at the time of the call + * @stable ICU 2.6 + */ + static StringEnumeration* U_EXPORT2 getAvailableLocales(void); + + /** + * Create a string enumerator of all possible keywords that are relevant to + * collation. At this point, the only recognized keyword for this + * service is "collation". + * @param status input-output error code + * @return a string enumeration over locale strings. The caller is + * responsible for closing the result. + * @stable ICU 3.0 + */ + static StringEnumeration* U_EXPORT2 getKeywords(UErrorCode& status); + + /** + * Given a keyword, create a string enumeration of all values + * for that keyword that are currently in use. + * @param keyword a particular keyword as enumerated by + * ucol_getKeywords. If any other keyword is passed in, status is set + * to U_ILLEGAL_ARGUMENT_ERROR. + * @param status input-output error code + * @return a string enumeration over collation keyword values, or nullptr + * upon error. The caller is responsible for deleting the result. + * @stable ICU 3.0 + */ + static StringEnumeration* U_EXPORT2 getKeywordValues(const char *keyword, UErrorCode& status); + + /** + * Given a key and a locale, returns an array of string values in a preferred + * order that would make a difference. These are all and only those values where + * the open (creation) of the service with the locale formed from the input locale + * plus input keyword and that value has different behavior than creation with the + * input locale alone. + * @param keyword one of the keys supported by this service. For now, only + * "collation" is supported. + * @param locale the locale + * @param commonlyUsed if set to true it will return only commonly used values + * with the given locale in preferred order. Otherwise, + * it will return all the available values for the locale. + * @param status ICU status + * @return a string enumeration over keyword values for the given key and the locale. + * @stable ICU 4.2 + */ + static StringEnumeration* U_EXPORT2 getKeywordValuesForLocale(const char* keyword, const Locale& locale, + UBool commonlyUsed, UErrorCode& status); + + /** + * Return the functionally equivalent locale for the given + * requested locale, with respect to given keyword, for the + * collation service. If two locales return the same result, then + * collators instantiated for these locales will behave + * equivalently. The converse is not always true; two collators + * may in fact be equivalent, but return different results, due to + * internal details. The return result has no other meaning than + * that stated above, and implies nothing as to the relationship + * between the two locales. This is intended for use by + * applications who wish to cache collators, or otherwise reuse + * collators when possible. The functional equivalent may change + * over time. For more information, please see the <a + * href="https://unicode-org.github.io/icu/userguide/locale#locales-and-services"> + * Locales and Services</a> section of the ICU User Guide. + * @param keyword a particular keyword as enumerated by + * ucol_getKeywords. + * @param locale the requested locale + * @param isAvailable reference to a fillin parameter that + * indicates whether the requested locale was 'available' to the + * collation service. A locale is defined as 'available' if it + * physically exists within the collation locale data. + * @param status reference to input-output error code + * @return the functionally equivalent collation locale, or the root + * locale upon error. + * @stable ICU 3.0 + */ + static Locale U_EXPORT2 getFunctionalEquivalent(const char* keyword, const Locale& locale, + UBool& isAvailable, UErrorCode& status); + +#if !UCONFIG_NO_SERVICE + /** + * Register a new Collator. The collator will be adopted. + * Because ICU may choose to cache collators internally, this must be + * called at application startup, prior to any calls to + * Collator::createInstance to avoid undefined behavior. + * @param toAdopt the Collator instance to be adopted + * @param locale the locale with which the collator will be associated + * @param status the in/out status code, no special meanings are assigned + * @return a registry key that can be used to unregister this collator + * @stable ICU 2.6 + */ + static URegistryKey U_EXPORT2 registerInstance(Collator* toAdopt, const Locale& locale, UErrorCode& status); + + /** + * Register a new CollatorFactory. The factory will be adopted. + * Because ICU may choose to cache collators internally, this must be + * called at application startup, prior to any calls to + * Collator::createInstance to avoid undefined behavior. + * @param toAdopt the CollatorFactory instance to be adopted + * @param status the in/out status code, no special meanings are assigned + * @return a registry key that can be used to unregister this collator + * @stable ICU 2.6 + */ + static URegistryKey U_EXPORT2 registerFactory(CollatorFactory* toAdopt, UErrorCode& status); + + /** + * Unregister a previously-registered Collator or CollatorFactory + * using the key returned from the register call. Key becomes + * invalid after a successful call and should not be used again. + * The object corresponding to the key will be deleted. + * Because ICU may choose to cache collators internally, this should + * be called during application shutdown, after all calls to + * Collator::createInstance to avoid undefined behavior. + * @param key the registry key returned by a previous call to registerInstance + * @param status the in/out status code, no special meanings are assigned + * @return true if the collator for the key was successfully unregistered + * @stable ICU 2.6 + */ + static UBool U_EXPORT2 unregister(URegistryKey key, UErrorCode& status); +#endif /* UCONFIG_NO_SERVICE */ + + /** + * Gets the version information for a Collator. + * @param info the version # information, the result will be filled in + * @stable ICU 2.0 + */ + virtual void getVersion(UVersionInfo info) const = 0; + + /** + * Returns a unique class ID POLYMORPHICALLY. Pure virtual method. + * This method is to implement a simple version of RTTI, since not all C++ + * compilers support genuine RTTI. Polymorphic operator==() and clone() + * methods call this method. + * @return The class ID for this object. All objects of a given class have + * the same class ID. Objects of other classes have different class + * IDs. + * @stable ICU 2.0 + */ + virtual UClassID getDynamicClassID(void) const override = 0; + + /** + * Universal attribute setter + * @param attr attribute type + * @param value attribute value + * @param status to indicate whether the operation went on smoothly or + * there were errors + * @stable ICU 2.2 + */ + virtual void setAttribute(UColAttribute attr, UColAttributeValue value, + UErrorCode &status) = 0; + + /** + * Universal attribute getter + * @param attr attribute type + * @param status to indicate whether the operation went on smoothly or + * there were errors + * @return attribute value + * @stable ICU 2.2 + */ + virtual UColAttributeValue getAttribute(UColAttribute attr, + UErrorCode &status) const = 0; + + /** + * Sets the variable top to the top of the specified reordering group. + * The variable top determines the highest-sorting character + * which is affected by UCOL_ALTERNATE_HANDLING. + * If that attribute is set to UCOL_NON_IGNORABLE, then the variable top has no effect. + * + * The base class implementation sets U_UNSUPPORTED_ERROR. + * @param group one of UCOL_REORDER_CODE_SPACE, UCOL_REORDER_CODE_PUNCTUATION, + * UCOL_REORDER_CODE_SYMBOL, UCOL_REORDER_CODE_CURRENCY; + * or UCOL_REORDER_CODE_DEFAULT to restore the default max variable group + * @param errorCode Standard ICU error code. Its input value must + * pass the U_SUCCESS() test, or else the function returns + * immediately. Check for U_FAILURE() on output or use with + * function chaining. (See User Guide for details.) + * @return *this + * @see getMaxVariable + * @stable ICU 53 + */ + virtual Collator &setMaxVariable(UColReorderCode group, UErrorCode &errorCode); + + /** + * Returns the maximum reordering group whose characters are affected by UCOL_ALTERNATE_HANDLING. + * + * The base class implementation returns UCOL_REORDER_CODE_PUNCTUATION. + * @return the maximum variable reordering group. + * @see setMaxVariable + * @stable ICU 53 + */ + virtual UColReorderCode getMaxVariable() const; + +#ifndef U_FORCE_HIDE_DEPRECATED_API + /** + * Sets the variable top to the primary weight of the specified string. + * + * Beginning with ICU 53, the variable top is pinned to + * the top of one of the supported reordering groups, + * and it must not be beyond the last of those groups. + * See setMaxVariable(). + * @param varTop one or more (if contraction) char16_ts to which the variable top should be set + * @param len length of variable top string. If -1 it is considered to be zero terminated. + * @param status error code. If error code is set, the return value is undefined. Errors set by this function are: <br> + * U_CE_NOT_FOUND_ERROR if more than one character was passed and there is no such contraction<br> + * U_ILLEGAL_ARGUMENT_ERROR if the variable top is beyond + * the last reordering group supported by setMaxVariable() + * @return variable top primary weight + * @deprecated ICU 53 Call setMaxVariable() instead. + */ + virtual uint32_t setVariableTop(const char16_t *varTop, int32_t len, UErrorCode &status) = 0; + + /** + * Sets the variable top to the primary weight of the specified string. + * + * Beginning with ICU 53, the variable top is pinned to + * the top of one of the supported reordering groups, + * and it must not be beyond the last of those groups. + * See setMaxVariable(). + * @param varTop a UnicodeString size 1 or more (if contraction) of char16_ts to which the variable top should be set + * @param status error code. If error code is set, the return value is undefined. Errors set by this function are: <br> + * U_CE_NOT_FOUND_ERROR if more than one character was passed and there is no such contraction<br> + * U_ILLEGAL_ARGUMENT_ERROR if the variable top is beyond + * the last reordering group supported by setMaxVariable() + * @return variable top primary weight + * @deprecated ICU 53 Call setMaxVariable() instead. + */ + virtual uint32_t setVariableTop(const UnicodeString &varTop, UErrorCode &status) = 0; + + /** + * Sets the variable top to the specified primary weight. + * + * Beginning with ICU 53, the variable top is pinned to + * the top of one of the supported reordering groups, + * and it must not be beyond the last of those groups. + * See setMaxVariable(). + * @param varTop primary weight, as returned by setVariableTop or ucol_getVariableTop + * @param status error code + * @deprecated ICU 53 Call setMaxVariable() instead. + */ + virtual void setVariableTop(uint32_t varTop, UErrorCode &status) = 0; +#endif // U_FORCE_HIDE_DEPRECATED_API + + /** + * Gets the variable top value of a Collator. + * @param status error code (not changed by function). If error code is set, the return value is undefined. + * @return the variable top primary weight + * @see getMaxVariable + * @stable ICU 2.0 + */ + virtual uint32_t getVariableTop(UErrorCode &status) const = 0; + + /** + * Get a UnicodeSet that contains all the characters and sequences + * tailored in this collator. + * @param status error code of the operation + * @return a pointer to a UnicodeSet object containing all the + * code points and sequences that may sort differently than + * in the root collator. The object must be disposed of by using delete + * @stable ICU 2.4 + */ + virtual UnicodeSet *getTailoredSet(UErrorCode &status) const; + +#ifndef U_FORCE_HIDE_DEPRECATED_API + /** + * Same as clone(). + * The base class implementation simply calls clone(). + * @return a copy of this object, owned by the caller + * @see clone() + * @deprecated ICU 50 no need to have two methods for cloning + */ + virtual Collator* safeClone() const; +#endif // U_FORCE_HIDE_DEPRECATED_API + + /** + * Get the sort key as an array of bytes from a UnicodeString. + * Sort key byte arrays are zero-terminated and can be compared using + * strcmp(). + * + * Note that sort keys are often less efficient than simply doing comparison. + * For more details, see the ICU User Guide. + * + * @param source string to be processed. + * @param result buffer to store result in. If nullptr, number of bytes needed + * will be returned. + * @param resultLength length of the result buffer. If if not enough the + * buffer will be filled to capacity. + * @return Number of bytes needed for storing the sort key + * @stable ICU 2.2 + */ + virtual int32_t getSortKey(const UnicodeString& source, + uint8_t* result, + int32_t resultLength) const = 0; + + /** + * Get the sort key as an array of bytes from a char16_t buffer. + * Sort key byte arrays are zero-terminated and can be compared using + * strcmp(). + * + * Note that sort keys are often less efficient than simply doing comparison. + * For more details, see the ICU User Guide. + * + * @param source string to be processed. + * @param sourceLength length of string to be processed. + * If -1, the string is 0 terminated and length will be decided by the + * function. + * @param result buffer to store result in. If nullptr, number of bytes needed + * will be returned. + * @param resultLength length of the result buffer. If if not enough the + * buffer will be filled to capacity. + * @return Number of bytes needed for storing the sort key + * @stable ICU 2.2 + */ + virtual int32_t getSortKey(const char16_t*source, int32_t sourceLength, + uint8_t*result, int32_t resultLength) const = 0; + + /** + * Produce a bound for a given sortkey and a number of levels. + * Return value is always the number of bytes needed, regardless of + * whether the result buffer was big enough or even valid.<br> + * Resulting bounds can be used to produce a range of strings that are + * between upper and lower bounds. For example, if bounds are produced + * for a sortkey of string "smith", strings between upper and lower + * bounds with one level would include "Smith", "SMITH", "sMiTh".<br> + * There are two upper bounds that can be produced. If UCOL_BOUND_UPPER + * is produced, strings matched would be as above. However, if bound + * produced using UCOL_BOUND_UPPER_LONG is used, the above example will + * also match "Smithsonian" and similar.<br> + * For more on usage, see example in cintltst/capitst.c in procedure + * TestBounds. + * Sort keys may be compared using <TT>strcmp</TT>. + * @param source The source sortkey. + * @param sourceLength The length of source, or -1 if null-terminated. + * (If an unmodified sortkey is passed, it is always null + * terminated). + * @param boundType Type of bound required. It can be UCOL_BOUND_LOWER, which + * produces a lower inclusive bound, UCOL_BOUND_UPPER, that + * produces upper bound that matches strings of the same length + * or UCOL_BOUND_UPPER_LONG that matches strings that have the + * same starting substring as the source string. + * @param noOfLevels Number of levels required in the resulting bound (for most + * uses, the recommended value is 1). See users guide for + * explanation on number of levels a sortkey can have. + * @param result A pointer to a buffer to receive the resulting sortkey. + * @param resultLength The maximum size of result. + * @param status Used for returning error code if something went wrong. If the + * number of levels requested is higher than the number of levels + * in the source key, a warning (U_SORT_KEY_TOO_SHORT_WARNING) is + * issued. + * @return The size needed to fully store the bound. + * @see ucol_keyHashCode + * @stable ICU 2.1 + */ + static int32_t U_EXPORT2 getBound(const uint8_t *source, + int32_t sourceLength, + UColBoundMode boundType, + uint32_t noOfLevels, + uint8_t *result, + int32_t resultLength, + UErrorCode &status); + + +protected: + + // Collator protected constructors ------------------------------------- + + /** + * Default constructor. + * Constructor is different from the old default Collator constructor. + * The task for determining the default collation strength and normalization + * mode is left to the child class. + * @stable ICU 2.0 + */ + Collator(); + +#ifndef U_HIDE_DEPRECATED_API + /** + * Constructor. + * Empty constructor, does not handle the arguments. + * This constructor is done for backward compatibility with 1.7 and 1.8. + * The task for handling the argument collation strength and normalization + * mode is left to the child class. + * @param collationStrength collation strength + * @param decompositionMode + * @deprecated ICU 2.4. Subclasses should use the default constructor + * instead and handle the strength and normalization mode themselves. + */ + Collator(UCollationStrength collationStrength, + UNormalizationMode decompositionMode); +#endif /* U_HIDE_DEPRECATED_API */ + + /** + * Copy constructor. + * @param other Collator object to be copied from + * @stable ICU 2.0 + */ + Collator(const Collator& other); + +public: + /** + * Used internally by registration to define the requested and valid locales. + * @param requestedLocale the requested locale + * @param validLocale the valid locale + * @param actualLocale the actual locale + * @internal + */ + virtual void setLocales(const Locale& requestedLocale, const Locale& validLocale, const Locale& actualLocale); + + /** Get the short definition string for a collator. This internal API harvests the collator's + * locale and the attribute set and produces a string that can be used for opening + * a collator with the same attributes using the ucol_openFromShortString API. + * This string will be normalized. + * The structure and the syntax of the string is defined in the "Naming collators" + * section of the users guide: + * https://unicode-org.github.io/icu/userguide/collation/concepts#collator-naming-scheme + * This function supports preflighting. + * + * This is internal, and intended to be used with delegate converters. + * + * @param locale a locale that will appear as a collators locale in the resulting + * short string definition. If nullptr, the locale will be harvested + * from the collator. + * @param buffer space to hold the resulting string + * @param capacity capacity of the buffer + * @param status for returning errors. All the preflighting errors are featured + * @return length of the resulting string + * @see ucol_openFromShortString + * @see ucol_normalizeShortDefinitionString + * @see ucol_getShortDefinitionString + * @internal + */ + virtual int32_t internalGetShortDefinitionString(const char *locale, + char *buffer, + int32_t capacity, + UErrorCode &status) const; + + /** + * Implements ucol_strcollUTF8(). + * @internal + */ + virtual UCollationResult internalCompareUTF8( + const char *left, int32_t leftLength, + const char *right, int32_t rightLength, + UErrorCode &errorCode) const; + + /** + * Implements ucol_nextSortKeyPart(). + * @internal + */ + virtual int32_t + internalNextSortKeyPart( + UCharIterator *iter, uint32_t state[2], + uint8_t *dest, int32_t count, UErrorCode &errorCode) const; + +#ifndef U_HIDE_INTERNAL_API + /** @internal */ + static inline Collator *fromUCollator(UCollator *uc) { + return reinterpret_cast<Collator *>(uc); + } + /** @internal */ + static inline const Collator *fromUCollator(const UCollator *uc) { + return reinterpret_cast<const Collator *>(uc); + } + /** @internal */ + inline UCollator *toUCollator() { + return reinterpret_cast<UCollator *>(this); + } + /** @internal */ + inline const UCollator *toUCollator() const { + return reinterpret_cast<const UCollator *>(this); + } +#endif // U_HIDE_INTERNAL_API + +private: + /** + * Assignment operator. Private for now. + */ + Collator& operator=(const Collator& other) = delete; + + friend class CFactory; + friend class SimpleCFactory; + friend class ICUCollatorFactory; + friend class ICUCollatorService; + static Collator* makeInstance(const Locale& desiredLocale, + UErrorCode& status); +}; + +#if !UCONFIG_NO_SERVICE +/** + * A factory, used with registerFactory, the creates multiple collators and provides + * display names for them. A factory supports some number of locales-- these are the + * locales for which it can create collators. The factory can be visible, in which + * case the supported locales will be enumerated by getAvailableLocales, or invisible, + * in which they are not. Invisible locales are still supported, they are just not + * listed by getAvailableLocales. + * <p> + * If standard locale display names are sufficient, Collator instances can + * be registered using registerInstance instead.</p> + * <p> + * Note: if the collators are to be used from C APIs, they must be instances + * of RuleBasedCollator.</p> + * + * @stable ICU 2.6 + */ +class U_I18N_API CollatorFactory : public UObject { +public: + + /** + * Destructor + * @stable ICU 3.0 + */ + virtual ~CollatorFactory(); + + /** + * Return true if this factory is visible. Default is true. + * If not visible, the locales supported by this factory will not + * be listed by getAvailableLocales. + * @return true if the factory is visible. + * @stable ICU 2.6 + */ + virtual UBool visible(void) const; + + /** + * Return a collator for the provided locale. If the locale + * is not supported, return nullptr. + * @param loc the locale identifying the collator to be created. + * @return a new collator if the locale is supported, otherwise nullptr. + * @stable ICU 2.6 + */ + virtual Collator* createCollator(const Locale& loc) = 0; + + /** + * Return the name of the collator for the objectLocale, localized for the displayLocale. + * If objectLocale is not supported, or the factory is not visible, set the result string + * to bogus. + * @param objectLocale the locale identifying the collator + * @param displayLocale the locale for which the display name of the collator should be localized + * @param result an output parameter for the display name, set to bogus if not supported. + * @return the display name + * @stable ICU 2.6 + */ + virtual UnicodeString& getDisplayName(const Locale& objectLocale, + const Locale& displayLocale, + UnicodeString& result); + + /** + * Return an array of all the locale names directly supported by this factory. + * The number of names is returned in count. This array is owned by the factory. + * Its contents must never change. + * @param count output parameter for the number of locales supported by the factory + * @param status the in/out error code + * @return a pointer to an array of count UnicodeStrings. + * @stable ICU 2.6 + */ + virtual const UnicodeString * getSupportedIDs(int32_t &count, UErrorCode& status) = 0; +}; +#endif /* UCONFIG_NO_SERVICE */ + +// Collator inline methods ----------------------------------------------- + +U_NAMESPACE_END + +#endif /* #if !UCONFIG_NO_COLLATION */ + +#endif /* U_SHOW_CPLUSPLUS_API */ + +#endif |