* For more information about the collation service see * the User Guide. *
* Collation service provides correct sorting orders for most locales supported in ICU. * If specific data for a locale is not available, the orders eventually falls back * to the CLDR root sort order. *
* Sort ordering may be customized by providing your own set of rules. For more on * this subject see the * Collation Customization section of the User Guide. *
* @see UCollationResult * @see UNormalizationMode * @see UCollationStrength * @see UCollationElements */ /** A collator. * For usage in C programs. */ struct UCollator; /** structure representing a collator object instance * @stable ICU 2.0 */ typedef struct UCollator UCollator; /** * UCOL_LESS is returned if source string is compared to be less than target * string in the ucol_strcoll() method. * UCOL_EQUAL is returned if source string is compared to be equal to target * string in the ucol_strcoll() method. * UCOL_GREATER is returned if source string is compared to be greater than * target string in the ucol_strcoll() method. * @see ucol_strcoll() *
* Possible values for a comparison result * @stable ICU 2.0 */ typedef enum { /** string a == string b */ UCOL_EQUAL = 0, /** string a > string b */ UCOL_GREATER = 1, /** string a < string b */ UCOL_LESS = -1 } UCollationResult ; /** Enum containing attribute values for controlling collation behavior. * Here are all the allowable values. Not every attribute can take every value. The only * universal value is UCOL_DEFAULT, which resets the attribute value to the predefined * value for that locale * @stable ICU 2.0 */ typedef enum { /** accepted by most attributes */ UCOL_DEFAULT = -1, /** Primary collation strength */ UCOL_PRIMARY = 0, /** Secondary collation strength */ UCOL_SECONDARY = 1, /** Tertiary collation strength */ UCOL_TERTIARY = 2, /** Default collation strength */ UCOL_DEFAULT_STRENGTH = UCOL_TERTIARY, UCOL_CE_STRENGTH_LIMIT, /** Quaternary collation strength */ UCOL_QUATERNARY=3, /** Identical collation strength */ UCOL_IDENTICAL=15, UCOL_STRENGTH_LIMIT, /** Turn the feature off - works for UCOL_FRENCH_COLLATION, UCOL_CASE_LEVEL, UCOL_HIRAGANA_QUATERNARY_MODE & UCOL_DECOMPOSITION_MODE*/ UCOL_OFF = 16, /** Turn the feature on - works for UCOL_FRENCH_COLLATION, UCOL_CASE_LEVEL, UCOL_HIRAGANA_QUATERNARY_MODE & UCOL_DECOMPOSITION_MODE*/ UCOL_ON = 17, /** Valid for UCOL_ALTERNATE_HANDLING. Alternate handling will be shifted */ UCOL_SHIFTED = 20, /** Valid for UCOL_ALTERNATE_HANDLING. Alternate handling will be non ignorable */ UCOL_NON_IGNORABLE = 21, /** Valid for UCOL_CASE_FIRST - lower case sorts before upper case */ UCOL_LOWER_FIRST = 24, /** upper case sorts before lower case */ UCOL_UPPER_FIRST = 25, #ifndef U_HIDE_DEPRECATED_API /** * One more than the highest normal UColAttributeValue value. * @deprecated ICU 58 The numeric value may change over time, see ICU ticket #12420. */ UCOL_ATTRIBUTE_VALUE_COUNT #endif /* U_HIDE_DEPRECATED_API */ } UColAttributeValue; /** * Enum containing the codes for reordering segments of the collation table that are not script * codes. These reordering codes are to be used in conjunction with the script codes. * @see ucol_getReorderCodes * @see ucol_setReorderCodes * @see ucol_getEquivalentReorderCodes * @see UScriptCode * @stable ICU 4.8 */ typedef enum { /** * A special reordering code that is used to specify the default * reordering codes for a locale. * @stable ICU 4.8 */ UCOL_REORDER_CODE_DEFAULT = -1, /** * A special reordering code that is used to specify no reordering codes. * @stable ICU 4.8 */ UCOL_REORDER_CODE_NONE = USCRIPT_UNKNOWN, /** * A special reordering code that is used to specify all other codes used for * reordering except for the codes lised as UColReorderCode values and those * listed explicitly in a reordering. * @stable ICU 4.8 */ UCOL_REORDER_CODE_OTHERS = USCRIPT_UNKNOWN, /** * Characters with the space property. * This is equivalent to the rule value "space". * @stable ICU 4.8 */ UCOL_REORDER_CODE_SPACE = 0x1000, /** * The first entry in the enumeration of reordering groups. This is intended for use in * range checking and enumeration of the reorder codes. * @stable ICU 4.8 */ UCOL_REORDER_CODE_FIRST = UCOL_REORDER_CODE_SPACE, /** * Characters with the punctuation property. * This is equivalent to the rule value "punct". * @stable ICU 4.8 */ UCOL_REORDER_CODE_PUNCTUATION = 0x1001, /** * Characters with the symbol property. * This is equivalent to the rule value "symbol". * @stable ICU 4.8 */ UCOL_REORDER_CODE_SYMBOL = 0x1002, /** * Characters with the currency property. * This is equivalent to the rule value "currency". * @stable ICU 4.8 */ UCOL_REORDER_CODE_CURRENCY = 0x1003, /** * Characters with the digit property. * This is equivalent to the rule value "digit". * @stable ICU 4.8 */ UCOL_REORDER_CODE_DIGIT = 0x1004, #ifndef U_HIDE_DEPRECATED_API /** * One more than the highest normal UColReorderCode value. * @deprecated ICU 58 The numeric value may change over time, see ICU ticket #12420. */ UCOL_REORDER_CODE_LIMIT = 0x1005 #endif /* U_HIDE_DEPRECATED_API */ } UColReorderCode; /** * Base letter represents a primary difference. Set comparison * level to UCOL_PRIMARY to ignore secondary and tertiary differences. * Use this to set the strength of a Collator object. * Example of primary difference, "abc" < "abd" * * Diacritical differences on the same base letter represent a secondary * difference. Set comparison level to UCOL_SECONDARY to ignore tertiary * differences. Use this to set the strength of a Collator object. * Example of secondary difference, "ä" >> "a". * * Uppercase and lowercase versions of the same character represents a * tertiary difference. Set comparison level to UCOL_TERTIARY to include * all comparison differences. Use this to set the strength of a Collator * object. * Example of tertiary difference, "abc" <<< "ABC". * * Two characters are considered "identical" when they have the same * unicode spellings. UCOL_IDENTICAL. * For example, "ä" == "ä". * * UCollationStrength is also used to determine the strength of sort keys * generated from UCollator objects * These values can be now found in the UColAttributeValue enum. * @stable ICU 2.0 **/ typedef UColAttributeValue UCollationStrength; /** Attributes that collation service understands. All the attributes can take UCOL_DEFAULT * value, as well as the values specific to each one. * @stable ICU 2.0 */ typedef enum { /** Attribute for direction of secondary weights - used in Canadian French. * Acceptable values are UCOL_ON, which results in secondary weights * being considered backwards and UCOL_OFF which treats secondary * weights in the order they appear. * @stable ICU 2.0 */ UCOL_FRENCH_COLLATION, /** Attribute for handling variable elements. * Acceptable values are UCOL_NON_IGNORABLE * which treats all the codepoints with non-ignorable * primary weights in the same way, * and UCOL_SHIFTED which causes codepoints with primary * weights that are equal or below the variable top value * to be ignored on primary level and moved to the quaternary * level. The default setting in a Collator object depends on the * locale data loaded from the resources. For most locales, the * default is UCOL_NON_IGNORABLE, but for others, such as "th", * the default could be UCOL_SHIFTED. * @stable ICU 2.0 */ UCOL_ALTERNATE_HANDLING, /** Controls the ordering of upper and lower case letters. * Acceptable values are UCOL_OFF, which orders * upper and lower case letters in accordance to their tertiary * weights, UCOL_UPPER_FIRST which forces upper case letters to * sort before lower case letters, and UCOL_LOWER_FIRST which does * the opposite. The default setting in a Collator object depends on the * locale data loaded from the resources. For most locales, the * default is UCOL_OFF, but for others, such as "da" or "mt", * the default could be UCOL_UPPER. * @stable ICU 2.0 */ UCOL_CASE_FIRST, /** Controls whether an extra case level (positioned before the third * level) is generated or not. Acceptable values are UCOL_OFF, * when case level is not generated, and UCOL_ON which causes the case * level to be generated. Contents of the case level are affected by * the value of UCOL_CASE_FIRST attribute. A simple way to ignore * accent differences in a string is to set the strength to UCOL_PRIMARY * and enable case level. The default setting in a Collator object depends * on the locale data loaded from the resources. * @stable ICU 2.0 */ UCOL_CASE_LEVEL, /** Controls whether the normalization check and necessary normalizations * are performed. When set to UCOL_OFF no normalization check * is performed. The correctness of the result is guaranteed only if the * input data is in so-called FCD form (see users manual for more info). * When set to UCOL_ON, an incremental check is performed to see whether * the input data is in the FCD form. If the data is not in the FCD form, * incremental NFD normalization is performed. The default setting in a * Collator object depends on the locale data loaded from the resources. * For many locales, the default is UCOL_OFF, but for others, such as "hi" * "vi', or "bn", * the default could be UCOL_ON. * @stable ICU 2.0 */ UCOL_NORMALIZATION_MODE, /** An alias for UCOL_NORMALIZATION_MODE attribute. * @stable ICU 2.0 */ UCOL_DECOMPOSITION_MODE = UCOL_NORMALIZATION_MODE, /** The strength attribute. Can be either UCOL_PRIMARY, UCOL_SECONDARY, * UCOL_TERTIARY, UCOL_QUATERNARY or UCOL_IDENTICAL. The usual strength * for most locales (except Japanese) is tertiary. * * Quaternary strength * is useful when combined with shifted setting for alternate handling * attribute and for JIS X 4061 collation, when it is used to distinguish * between Katakana and Hiragana. * Otherwise, quaternary level * is affected only by the number of non-ignorable code points in * the string. * * Identical strength is rarely useful, as it amounts * to codepoints of the NFD form of the string. * @stable ICU 2.0 */ UCOL_STRENGTH, #ifndef U_HIDE_DEPRECATED_API /** When turned on, this attribute positions Hiragana before all * non-ignorables on quaternary level This is a sneaky way to produce JIS * sort order. * * This attribute was an implementation detail of the CLDR Japanese tailoring. * Since ICU 50, this attribute is not settable any more via API functions. * Since CLDR 25/ICU 53, explicit quaternary relations are used * to achieve the same Japanese sort order. * * @deprecated ICU 50 Implementation detail, cannot be set via API, was removed from implementation. */ UCOL_HIRAGANA_QUATERNARY_MODE = UCOL_STRENGTH + 1, #endif /* U_HIDE_DEPRECATED_API */ /** * When turned on, this attribute makes * substrings of digits sort according to their numeric values. * * This is a way to get '100' to sort AFTER '2'. Note that the longest * digit substring that can be treated as a single unit is * 254 digits (not counting leading zeros). If a digit substring is * longer than that, the digits beyond the limit will be treated as a * separate digit substring. * * A "digit" in this sense is a code point with General_Category=Nd, * which does not include circled numbers, roman numerals, etc. * Only a contiguous digit substring is considered, that is, * non-negative integers without separators. * There is no support for plus/minus signs, decimals, exponents, etc. * * @stable ICU 2.8 */ UCOL_NUMERIC_COLLATION = UCOL_STRENGTH + 2, /* Do not conditionalize the following with #ifndef U_HIDE_DEPRECATED_API, * it is needed for layout of RuleBasedCollator object. */ #ifndef U_FORCE_HIDE_DEPRECATED_API /** * One more than the highest normal UColAttribute value. * @deprecated ICU 58 The numeric value may change over time, see ICU ticket #12420. */ UCOL_ATTRIBUTE_COUNT #endif // U_FORCE_HIDE_DEPRECATED_API } UColAttribute; /** Options for retrieving the rule string * @stable ICU 2.0 */ typedef enum { /** * Retrieves the tailoring rules only. * Same as calling the version of getRules() without UColRuleOption. * @stable ICU 2.0 */ UCOL_TAILORING_ONLY, /** * Retrieves the "UCA rules" concatenated with the tailoring rules. * The "UCA rules" are an approximation of the root collator's sort order. * They are almost never used or useful at runtime and can be removed from the data. * See https://unicode-org.github.io/icu/userguide/collation/customization#building-on-existing-locales * @stable ICU 2.0 */ UCOL_FULL_RULES } UColRuleOption ; /** * Open a UCollator for comparing strings. * * 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 User Guide: Collation API. * * The UCollator pointer is used in all the calls to the Collation * service. After finished, collator must be disposed of by calling * {@link #ucol_close }. * @param loc The locale containing the required collation rules. * Special values for locales can be passed in - * if NULL is passed for the locale, the default locale * collation rules will be used. If empty string ("") or * "root" are passed, the root collator will be returned. * @param status A pointer to a UErrorCode to receive any errors * @return A pointer to a UCollator, or 0 if an error occurred. * @see ucol_openRules * @see ucol_clone * @see ucol_close * @stable ICU 2.0 */ U_CAPI UCollator* U_EXPORT2 ucol_open(const char *loc, UErrorCode *status); /** * Produce a UCollator instance according to the rules supplied. * The rules are used to change the default ordering, defined in the * UCA in a process called tailoring. The resulting UCollator pointer * can be used in the same way as the one obtained by {@link #ucol_strcoll }. * @param rules A string describing the collation rules. For the syntax * of the rules please see users guide. * @param rulesLength The length of rules, or -1 if null-terminated. * @param normalizationMode The normalization mode: One of * UCOL_OFF (expect the text to not need normalization), * UCOL_ON (normalize), or * UCOL_DEFAULT (set the mode according to the rules) * @param strength The default collation strength; one of UCOL_PRIMARY, UCOL_SECONDARY, * UCOL_TERTIARY, UCOL_IDENTICAL,UCOL_DEFAULT_STRENGTH - can be also set in the rules. * @param parseError A pointer to UParseError to receive information about errors * occurred during parsing. This argument can currently be set * to NULL, but at users own risk. Please provide a real structure. * @param status A pointer to a UErrorCode to receive any errors * @return A pointer to a UCollator. It is not guaranteed that NULL be returned in case * of error - please use status argument to check for errors. * @see ucol_open * @see ucol_clone * @see ucol_close * @stable ICU 2.0 */ U_CAPI UCollator* U_EXPORT2 ucol_openRules( const UChar *rules, int32_t rulesLength, UColAttributeValue normalizationMode, UCollationStrength strength, UParseError *parseError, UErrorCode *status); #ifndef U_HIDE_DEPRECATED_API /** * Open a collator defined by a short form string. * 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 * Attributes are overridden by the subsequent attributes. So, for "S2_S3", final * strength will be 3. 3066bis locale overrides individual locale parts. * The call to this function is equivalent to a call to ucol_open, followed by a * series of calls to ucol_setAttribute and ucol_setVariableTop. * @param definition A short string containing a locale and a set of attributes. * Attributes not explicitly mentioned are left at the default * state for a locale. * @param parseError if not NULL, structure that will get filled with error's pre * and post context in case of error. * @param forceDefaults if false, the settings that are the same as the collator * default settings will not be applied (for example, setting * French secondary on a French collator would not be executed). * If true, all the settings will be applied regardless of the * collator default value. If the definition * strings are to be cached, should be set to false. * @param status Error code. Apart from regular error conditions connected to * instantiating collators (like out of memory or similar), this * API will return an error if an invalid attribute or attribute/value * combination is specified. * @return A pointer to a UCollator or 0 if an error occurred (including an * invalid attribute). * @see ucol_open * @see ucol_setAttribute * @see ucol_setVariableTop * @see ucol_getShortDefinitionString * @see ucol_normalizeShortDefinitionString * @deprecated ICU 54 Use ucol_open() with language tag collation keywords instead. */ U_DEPRECATED UCollator* U_EXPORT2 ucol_openFromShortString( const char *definition, UBool forceDefaults, UParseError *parseError, UErrorCode *status); #endif /* U_HIDE_DEPRECATED_API */ #ifndef U_HIDE_DEPRECATED_API /** * Get a set containing the contractions defined by the collator. The set includes * both the root collator's contractions and the contractions defined by the collator. This set * will contain only strings. If a tailoring explicitly suppresses contractions from * the root collator (like Russian), removed contractions will not be in the resulting set. * @param coll collator * @param conts the set to hold the result. It gets emptied before * contractions are added. * @param status to hold the error code * @return the size of the contraction set * * @deprecated ICU 3.4, use ucol_getContractionsAndExpansions instead */ U_DEPRECATED int32_t U_EXPORT2 ucol_getContractions( const UCollator *coll, USet *conts, UErrorCode *status); #endif /* U_HIDE_DEPRECATED_API */ /** * Get a set containing the expansions defined by the collator. The set includes * both the root collator's expansions and the expansions defined by the tailoring * @param coll collator * @param contractions if not NULL, the set to hold the contractions * @param expansions if not NULL, the set to hold the expansions * @param addPrefixes add the prefix contextual elements to contractions * @param status to hold the error code * * @stable ICU 3.4 */ U_CAPI void U_EXPORT2 ucol_getContractionsAndExpansions( const UCollator *coll, USet *contractions, USet *expansions, UBool addPrefixes, UErrorCode *status); /** * Close a UCollator. * Once closed, a UCollator should not be used. Every open collator should * be closed. Otherwise, a memory leak will result. * @param coll The UCollator to close. * @see ucol_open * @see ucol_openRules * @see ucol_clone * @stable ICU 2.0 */ U_CAPI void U_EXPORT2 ucol_close(UCollator *coll); #if U_SHOW_CPLUSPLUS_API U_NAMESPACE_BEGIN /** * \class LocalUCollatorPointer * "Smart pointer" class, closes a UCollator via ucol_close(). * For most methods see the LocalPointerBase base class. * * @see LocalPointerBase * @see LocalPointer * @stable ICU 4.4 */ U_DEFINE_LOCAL_OPEN_POINTER(LocalUCollatorPointer, UCollator, ucol_close); U_NAMESPACE_END #endif /** * Compare two strings. * The strings will be compared using the options already specified. * @param coll The UCollator containing the comparison rules. * @param source The source string. * @param sourceLength The length of source, or -1 if null-terminated. * @param target The target string. * @param targetLength The length of target, or -1 if null-terminated. * @return The result of comparing the strings; one of UCOL_EQUAL, * UCOL_GREATER, UCOL_LESS * @see ucol_greater * @see ucol_greaterOrEqual * @see ucol_equal * @stable ICU 2.0 */ U_CAPI UCollationResult U_EXPORT2 ucol_strcoll( const UCollator *coll, const UChar *source, int32_t sourceLength, const UChar *target, int32_t targetLength); /** * Compare two strings in UTF-8. * The strings will be compared using the options already specified. * Note: When input string contains malformed a UTF-8 byte sequence, * this function treats these bytes as REPLACEMENT CHARACTER (U+FFFD). * @param coll The UCollator containing the comparison rules. * @param source The source UTF-8 string. * @param sourceLength The length of source, or -1 if null-terminated. * @param target The target UTF-8 string. * @param targetLength The length of target, or -1 if null-terminated. * @param status A pointer to a UErrorCode to receive any errors * @return The result of comparing the strings; one of UCOL_EQUAL, * UCOL_GREATER, UCOL_LESS * @see ucol_greater * @see ucol_greaterOrEqual * @see ucol_equal * @stable ICU 50 */ U_CAPI UCollationResult U_EXPORT2 ucol_strcollUTF8( const UCollator *coll, const char *source, int32_t sourceLength, const char *target, int32_t targetLength, UErrorCode *status); /** * Determine if one string is greater than another. * This function is equivalent to {@link #ucol_strcoll } == UCOL_GREATER * @param coll The UCollator containing the comparison rules. * @param source The source string. * @param sourceLength The length of source, or -1 if null-terminated. * @param target The target string. * @param targetLength The length of target, or -1 if null-terminated. * @return true if source is greater than target, false otherwise. * @see ucol_strcoll * @see ucol_greaterOrEqual * @see ucol_equal * @stable ICU 2.0 */ U_CAPI UBool U_EXPORT2 ucol_greater(const UCollator *coll, const UChar *source, int32_t sourceLength, const UChar *target, int32_t targetLength); /** * Determine if one string is greater than or equal to another. * This function is equivalent to {@link #ucol_strcoll } != UCOL_LESS * @param coll The UCollator containing the comparison rules. * @param source The source string. * @param sourceLength The length of source, or -1 if null-terminated. * @param target The target string. * @param targetLength The length of target, or -1 if null-terminated. * @return true if source is greater than or equal to target, false otherwise. * @see ucol_strcoll * @see ucol_greater * @see ucol_equal * @stable ICU 2.0 */ U_CAPI UBool U_EXPORT2 ucol_greaterOrEqual(const UCollator *coll, const UChar *source, int32_t sourceLength, const UChar *target, int32_t targetLength); /** * Compare two strings for equality. * This function is equivalent to {@link #ucol_strcoll } == UCOL_EQUAL * @param coll The UCollator containing the comparison rules. * @param source The source string. * @param sourceLength The length of source, or -1 if null-terminated. * @param target The target string. * @param targetLength The length of target, or -1 if null-terminated. * @return true if source is equal to target, false otherwise * @see ucol_strcoll * @see ucol_greater * @see ucol_greaterOrEqual * @stable ICU 2.0 */ U_CAPI UBool U_EXPORT2 ucol_equal(const UCollator *coll, const UChar *source, int32_t sourceLength, const UChar *target, int32_t targetLength); /** * Compare two UTF-8 encoded strings. * The strings will be compared using the options already specified. * @param coll The UCollator containing the comparison rules. * @param sIter The source string iterator. * @param tIter The target string iterator. * @return The result of comparing the strings; one of UCOL_EQUAL, * UCOL_GREATER, UCOL_LESS * @param status A pointer to a UErrorCode to receive any errors * @see ucol_strcoll * @stable ICU 2.6 */ U_CAPI UCollationResult U_EXPORT2 ucol_strcollIter( const UCollator *coll, UCharIterator *sIter, UCharIterator *tIter, UErrorCode *status); /** * Get the collation strength used in a UCollator. * The strength influences how strings are compared. * @param coll The UCollator to query. * @return The collation strength; one of UCOL_PRIMARY, UCOL_SECONDARY, * UCOL_TERTIARY, UCOL_QUATERNARY, UCOL_IDENTICAL * @see ucol_setStrength * @stable ICU 2.0 */ U_CAPI UCollationStrength U_EXPORT2 ucol_getStrength(const UCollator *coll); /** * Set the collation strength used in a UCollator. * The strength influences how strings are compared. * @param coll The UCollator to set. * @param strength The desired collation strength; one of UCOL_PRIMARY, * UCOL_SECONDARY, UCOL_TERTIARY, UCOL_QUATERNARY, UCOL_IDENTICAL, UCOL_DEFAULT * @see ucol_getStrength * @stable ICU 2.0 */ U_CAPI void U_EXPORT2 ucol_setStrength(UCollator *coll, UCollationStrength strength); /** * Retrieves the reordering codes for this collator. * These reordering codes are a combination of UScript codes and UColReorderCode entries. * @param coll The UCollator to query. * @param dest The array to fill with the script ordering. * @param destCapacity The length of dest. If it is 0, then dest may be NULL and the function * will only return the length of the result without writing any codes (pre-flighting). * @param pErrorCode Must be a valid pointer to an error code value, which must not indicate a * failure before the function call. * @return The number of reordering codes written to the dest array. * @see ucol_setReorderCodes * @see ucol_getEquivalentReorderCodes * @see UScriptCode * @see UColReorderCode * @stable ICU 4.8 */ U_CAPI int32_t U_EXPORT2 ucol_getReorderCodes(const UCollator* coll, int32_t* dest, int32_t destCapacity, UErrorCode *pErrorCode); /** * Sets the reordering codes for this collator. * Collation reordering allows scripts and some other groups of characters * to be moved relative to each other. This reordering is done on top of * the DUCET/CLDR standard collation order. Reordering can specify groups to be placed * at the start and/or the end of the collation order. These groups are specified using * UScript codes and UColReorderCode entries. * *
By default, reordering codes specified for the start of the order are placed in the * order given after several special non-script blocks. These special groups of characters * are space, punctuation, symbol, currency, and digit. These special groups are represented with * UColReorderCode entries. Script groups can be intermingled with * these special non-script groups if those special groups are explicitly specified in the reordering. * *
The special code OTHERS stands for any script that is not explicitly * mentioned in the list of reordering codes given. Anything that is after OTHERS * will go at the very end of the reordering in the order given. * *
The special reorder code DEFAULT will reset the reordering for this collator * to the default for this collator. The default reordering may be the DUCET/CLDR order or may be a reordering that * was specified when this collator was created from resource data or from rules. The * DEFAULT code must be the sole code supplied when it is used. * If not, then U_ILLEGAL_ARGUMENT_ERROR will be set. * *
The special reorder code NONE will remove any reordering for this collator.
* The result of setting no reordering will be to have the DUCET/CLDR ordering used. The
* NONE code must be the sole code supplied when it is used.
*
* @param coll The UCollator to set.
* @param reorderCodes An array of script codes in the new order. This can be NULL 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 pErrorCode Must be a valid pointer to an error code value, which must not indicate a
* failure before the function call.
* @see ucol_getReorderCodes
* @see ucol_getEquivalentReorderCodes
* @see UScriptCode
* @see UColReorderCode
* @stable ICU 4.8
*/
U_CAPI void U_EXPORT2
ucol_setReorderCodes(UCollator* coll,
const int32_t* reorderCodes,
int32_t reorderCodesLength,
UErrorCode *pErrorCode);
/**
* 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 ordering.
* @param destCapacity The length of dest. If it is 0, then dest may be NULL and the function
* will only return the length of the result without writing any codes (pre-flighting).
* @param pErrorCode Must be a valid pointer to an error code value, which must not indicate
* a failure before the function call.
* @return The number of reordering codes written to the dest array.
* @see ucol_setReorderCodes
* @see ucol_getReorderCodes
* @see UScriptCode
* @see UColReorderCode
* @stable ICU 4.8
*/
U_CAPI int32_t U_EXPORT2
ucol_getEquivalentReorderCodes(int32_t reorderCode,
int32_t* dest,
int32_t destCapacity,
UErrorCode *pErrorCode);
/**
* Get the display name for a UCollator.
* The display name is suitable for presentation to a user.
* @param objLoc The locale of the collator in question.
* @param dispLoc The locale for display.
* @param result A pointer to a buffer to receive the attribute.
* @param resultLength The maximum size of result.
* @param status A pointer to a UErrorCode to receive any errors
* @return The total buffer size needed; if greater than resultLength,
* the output was truncated.
* @stable ICU 2.0
*/
U_CAPI int32_t U_EXPORT2
ucol_getDisplayName( const char *objLoc,
const char *dispLoc,
UChar *result,
int32_t resultLength,
UErrorCode *status);
/**
* Get a locale for which collation rules are available.
* A UCollator in a locale returned by this function will perform the correct
* collation for the locale.
* @param localeIndex The index of the desired locale.
* @return A locale for which collation rules are available, or 0 if none.
* @see ucol_countAvailable
* @stable ICU 2.0
*/
U_CAPI const char* U_EXPORT2
ucol_getAvailable(int32_t localeIndex);
/**
* Determine how many locales have collation rules available.
* This function is most useful as determining the loop ending condition for
* calls to {@link #ucol_getAvailable }.
* @return The number of locales for which collation rules are available.
* @see ucol_getAvailable
* @stable ICU 2.0
*/
U_CAPI int32_t U_EXPORT2
ucol_countAvailable(void);
#if !UCONFIG_NO_SERVICE
/**
* Create a string enumerator of all locales for which a valid
* collator may be opened.
* @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
*/
U_CAPI UEnumeration* U_EXPORT2
ucol_openAvailableLocales(UErrorCode *status);
#endif
/**
* 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
*/
U_CAPI UEnumeration* U_EXPORT2
ucol_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 NULL
* upon error. The caller is responsible for closing the result.
* @stable ICU 3.0
*/
U_CAPI UEnumeration* U_EXPORT2
ucol_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 key 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 error status
* @return a string enumeration over keyword values for the given key and the locale.
* @stable ICU 4.2
*/
U_CAPI UEnumeration* U_EXPORT2
ucol_getKeywordValuesForLocale(const char* key,
const char* locale,
UBool commonlyUsed,
UErrorCode* status);
/**
* Return the functionally equivalent locale for the specified
* input locale, with respect to given keyword, for the
* collation service. If two different input locale + keyword
* combinations produce the same result locale, then collators
* instantiated for these two different input 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
* Locales and Services section of the ICU User Guide.
* @param result fillin for the functionally equivalent result locale
* @param resultCapacity capacity of the fillin buffer
* @param keyword a particular keyword as enumerated by
* ucol_getKeywords.
* @param locale the specified input locale
* @param isAvailable if non-NULL, pointer to a fillin parameter that
* on return indicates whether the specified input locale was 'available'
* to the collation service. A locale is defined as 'available' if it
* physically exists within the collation locale data.
* @param status pointer to input-output error code
* @return the actual buffer size needed for the locale. If greater
* than resultCapacity, the returned full name will be truncated and
* an error code will be returned.
* @stable ICU 3.0
*/
U_CAPI int32_t U_EXPORT2
ucol_getFunctionalEquivalent(char* result, int32_t resultCapacity,
const char* keyword, const char* locale,
UBool* isAvailable, UErrorCode* status);
/**
* Get the collation tailoring rules from a UCollator.
* The rules will follow the rule syntax.
* @param coll The UCollator to query.
* @param length
* @return The collation tailoring rules.
* @stable ICU 2.0
*/
U_CAPI const UChar* U_EXPORT2
ucol_getRules( const UCollator *coll,
int32_t *length);
#ifndef U_HIDE_DEPRECATED_API
/** Get the short definition string for a collator. This 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 API supports preflighting.
* @param coll a collator
* @param locale a locale that will appear as a collators locale in the resulting
* short string definition. If NULL, 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
* @deprecated ICU 54
*/
U_DEPRECATED int32_t U_EXPORT2
ucol_getShortDefinitionString(const UCollator *coll,
const char *locale,
char *buffer,
int32_t capacity,
UErrorCode *status);
/** Verifies and normalizes short definition string.
* Normalized short definition string has all the option sorted by the argument name,
* so that equivalent definition strings are the same.
* This API supports preflighting.
* @param source definition string
* @param destination space to hold the resulting string
* @param capacity capacity of the buffer
* @param parseError if not NULL, structure that will get filled with error's pre
* and post context in case of error.
* @param status Error code. This API will return an error if an invalid attribute
* or attribute/value combination is specified. All the preflighting
* errors are also featured
* @return length of the resulting normalized string.
*
* @see ucol_openFromShortString
* @see ucol_getShortDefinitionString
*
* @deprecated ICU 54
*/
U_DEPRECATED int32_t U_EXPORT2
ucol_normalizeShortDefinitionString(const char *source,
char *destination,
int32_t capacity,
UParseError *parseError,
UErrorCode *status);
#endif /* U_HIDE_DEPRECATED_API */
/**
* Get a sort key for a string from a UCollator.
* Sort keys may be compared using strcmp.
*
* Note that sort keys are often less efficient than simply doing comparison.
* For more details, see the ICU User Guide.
*
* Like ICU functions that write to an output buffer, the buffer contents
* is undefined if the buffer capacity (resultLength parameter) is too small.
* Unlike ICU functions that write a string to an output buffer,
* the terminating zero byte is counted in the sort key length.
* @param coll The UCollator containing the collation rules.
* @param source The string to transform.
* @param sourceLength The length of source, or -1 if null-terminated.
* @param result A pointer to a buffer to receive the attribute.
* @param resultLength The maximum size of result.
* @return The size needed to fully store the sort key.
* If there was an internal error generating the sort key,
* a zero value is returned.
* @see ucol_keyHashCode
* @stable ICU 2.0
*/
U_CAPI int32_t U_EXPORT2
ucol_getSortKey(const UCollator *coll,
const UChar *source,
int32_t sourceLength,
uint8_t *result,
int32_t resultLength);
/** Gets the next count bytes of a sort key. Caller needs
* to preserve state array between calls and to provide
* the same type of UCharIterator set with the same string.
* The destination buffer provided must be big enough to store
* the number of requested bytes.
*
* The generated sort key may or may not be compatible with
* sort keys generated using ucol_getSortKey().
* @param coll The UCollator containing the collation rules.
* @param iter UCharIterator containing the string we need
* the sort key to be calculated for.
* @param state Opaque state of sortkey iteration.
* @param dest Buffer to hold the resulting sortkey part
* @param count number of sort key bytes required.
* @param status error code indicator.
* @return the actual number of bytes of a sortkey. It can be
* smaller than count if we have reached the end of
* the sort key.
* @stable ICU 2.6
*/
U_CAPI int32_t U_EXPORT2
ucol_nextSortKeyPart(const UCollator *coll,
UCharIterator *iter,
uint32_t state[2],
uint8_t *dest, int32_t count,
UErrorCode *status);
/** enum that is taken by ucol_getBound API
* See below for explanation
* do not change the values assigned to the
* members of this enum. Underlying code
* depends on them having these numbers
* @stable ICU 2.0
*/
typedef enum {
/** lower bound */
UCOL_BOUND_LOWER = 0,
/** upper bound that will match strings of exact size */
UCOL_BOUND_UPPER = 1,
/** upper bound that will match all the strings that have the same initial substring as the given string */
UCOL_BOUND_UPPER_LONG = 2,
#ifndef U_HIDE_DEPRECATED_API
/**
* One more than the highest normal UColBoundMode value.
* @deprecated ICU 58 The numeric value may change over time, see ICU ticket #12420.
*/
UCOL_BOUND_VALUE_COUNT
#endif /* U_HIDE_DEPRECATED_API */
} UColBoundMode;
/**
* 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.
* 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".
* 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.
* For more on usage, see example in cintltst/capitst.c in procedure
* TestBounds.
* Sort keys may be compared using strcmp.
* @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
*/
U_CAPI int32_t U_EXPORT2
ucol_getBound(const uint8_t *source,
int32_t sourceLength,
UColBoundMode boundType,
uint32_t noOfLevels,
uint8_t *result,
int32_t resultLength,
UErrorCode *status);
/**
* Gets the version information for a Collator. Version is currently
* an opaque 32-bit number which depends, among other things, on major
* versions of the collator tailoring and UCA.
* @param coll The UCollator to query.
* @param info the version # information, the result will be filled in
* @stable ICU 2.0
*/
U_CAPI void U_EXPORT2
ucol_getVersion(const UCollator* coll, UVersionInfo info);
/**
* Gets the UCA version information for a Collator. Version is the
* UCA version number (3.1.1, 4.0).
* @param coll The UCollator to query.
* @param info the version # information, the result will be filled in
* @stable ICU 2.8
*/
U_CAPI void U_EXPORT2
ucol_getUCAVersion(const UCollator* coll, UVersionInfo info);
/**
* Merges two sort keys. The levels are merged with their corresponding counterparts
* (primaries with primaries, secondaries with secondaries etc.). Between the values
* from the same level a separator is inserted.
*
* This is useful, for example, for combining sort keys from first and last names
* to sort such pairs.
* See http://www.unicode.org/reports/tr10/#Merging_Sort_Keys
*
* The recommended way to achieve "merged" sorting is by
* concatenating strings with U+FFFE between them.
* The concatenation has the same sort order as the merged sort keys,
* but merge(getSortKey(str1), getSortKey(str2)) may differ from getSortKey(str1 + '\\uFFFE' + str2).
* Using strings with U+FFFE may yield shorter sort keys.
*
* For details about Sort Key Features see
* https://unicode-org.github.io/icu/userguide/collation/api#sort-key-features
*
* It is possible to merge multiple sort keys by consecutively merging
* another one with the intermediate result.
*
* The length of the merge result is the sum of the lengths of the input sort keys.
*
* Example (uncompressed):
*
191B1D 01 050505 01 910505 00 * 1F2123 01 050505 01 910505 00* will be merged as *
191B1D 02 1F2123 01 050505 02 050505 01 910505 02 910505 00* * If the destination buffer is not big enough, then its contents are undefined. * If any of source lengths are zero or any of the source pointers are NULL/undefined, * the result is of size zero. * * @param src1 the first sort key * @param src1Length the length of the first sort key, including the zero byte at the end; * can be -1 if the function is to find the length * @param src2 the second sort key * @param src2Length the length of the second sort key, including the zero byte at the end; * can be -1 if the function is to find the length * @param dest the buffer where the merged sort key is written, * can be NULL if destCapacity==0 * @param destCapacity the number of bytes in the dest buffer * @return the length of the merged sort key, src1Length+src2Length; * can be larger than destCapacity, or 0 if an error occurs (only for illegal arguments), * in which cases the contents of dest is undefined * @stable ICU 2.0 */ U_CAPI int32_t U_EXPORT2 ucol_mergeSortkeys(const uint8_t *src1, int32_t src1Length, const uint8_t *src2, int32_t src2Length, uint8_t *dest, int32_t destCapacity); /** * Universal attribute setter * @param coll collator which attributes are to be changed * @param attr attribute type * @param value attribute value * @param status to indicate whether the operation went on smoothly or there were errors * @see UColAttribute * @see UColAttributeValue * @see ucol_getAttribute * @stable ICU 2.0 */ U_CAPI void U_EXPORT2 ucol_setAttribute(UCollator *coll, UColAttribute attr, UColAttributeValue value, UErrorCode *status); /** * Universal attribute getter * @param coll collator which attributes are to be changed * @param attr attribute type * @return attribute value * @param status to indicate whether the operation went on smoothly or there were errors * @see UColAttribute * @see UColAttributeValue * @see ucol_setAttribute * @stable ICU 2.0 */ U_CAPI UColAttributeValue U_EXPORT2 ucol_getAttribute(const UCollator *coll, UColAttribute attr, UErrorCode *status); /** * 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. * @param coll the collator * @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 pErrorCode 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.) * @see ucol_getMaxVariable * @stable ICU 53 */ U_CAPI void U_EXPORT2 ucol_setMaxVariable(UCollator *coll, UColReorderCode group, UErrorCode *pErrorCode); /** * Returns the maximum reordering group whose characters are affected by UCOL_ALTERNATE_HANDLING. * @param coll the collator * @return the maximum variable reordering group. * @see ucol_setMaxVariable * @stable ICU 53 */ U_CAPI UColReorderCode U_EXPORT2 ucol_getMaxVariable(const UCollator *coll); #ifndef U_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 ucol_setMaxVariable(). * @param coll the collator * @param varTop one or more (if contraction) UChars 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: