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diff --git a/vendor/icu/include/unicode/unistr.h b/vendor/icu/include/unicode/unistr.h new file mode 100644 index 0000000000..c160301a9a --- /dev/null +++ b/vendor/icu/include/unicode/unistr.h @@ -0,0 +1,4771 @@ +// © 2016 and later: Unicode, Inc. and others. +// License & terms of use: http://www.unicode.org/copyright.html +/* +********************************************************************** +* Copyright (C) 1998-2016, International Business Machines +* Corporation and others. All Rights Reserved. +********************************************************************** +* +* File unistr.h +* +* Modification History: +* +* Date Name Description +* 09/25/98 stephen Creation. +* 11/11/98 stephen Changed per 11/9 code review. +* 04/20/99 stephen Overhauled per 4/16 code review. +* 11/18/99 aliu Made to inherit from Replaceable. Added method +* handleReplaceBetween(); other methods unchanged. +* 06/25/01 grhoten Remove dependency on iostream. +****************************************************************************** +*/ + +#ifndef UNISTR_H +#define UNISTR_H + +/** + * \file + * \brief C++ API: Unicode String + */ + +#include <cstddef> +#include <unicode/utypes.h> +#include <unicode/char16ptr.h> +#include <unicode/rep.h> +#include <unicode/std_string.h> +#include <unicode/stringpiece.h> +#include <unicode/bytestream.h> + +struct UConverter; // unicode/ucnv.h + +#ifndef USTRING_H +/** + * \ingroup ustring_ustrlen + */ +U_STABLE int32_t U_EXPORT2 +u_strlen(const UChar *s); +#endif + +U_NAMESPACE_BEGIN + +#if !UCONFIG_NO_BREAK_ITERATION +class BreakIterator; // unicode/brkiter.h +#endif +class Edits; + +U_NAMESPACE_END + +// Not #ifndef U_HIDE_INTERNAL_API because UnicodeString needs the UStringCaseMapper. +/** + * Internal string case mapping function type. + * All error checking must be done. + * src and dest must not overlap. + * @internal + */ +typedef int32_t U_CALLCONV +UStringCaseMapper(int32_t caseLocale, uint32_t options, +#if !UCONFIG_NO_BREAK_ITERATION + icu::BreakIterator *iter, +#endif + char16_t *dest, int32_t destCapacity, + const char16_t *src, int32_t srcLength, + icu::Edits *edits, + UErrorCode &errorCode); + +U_NAMESPACE_BEGIN + +class Locale; // unicode/locid.h +class StringCharacterIterator; +class UnicodeStringAppendable; // unicode/appendable.h + +/* The <iostream> include has been moved to unicode/ustream.h */ + +/** + * Constant to be used in the UnicodeString(char *, int32_t, EInvariant) constructor + * which constructs a Unicode string from an invariant-character char * string. + * About invariant characters see utypes.h. + * This constructor has no runtime dependency on conversion code and is + * therefore recommended over ones taking a charset name string + * (where the empty string "" indicates invariant-character conversion). + * + * @stable ICU 3.2 + */ +#define US_INV icu::UnicodeString::kInvariant + +/** + * Unicode String literals in C++. + * + * Note: these macros are not recommended for new code. + * Prior to the availability of C++11 and u"unicode string literals", + * these macros were provided for portability and efficiency when + * initializing UnicodeStrings from literals. + * + * They work only for strings that contain "invariant characters", i.e., + * only latin letters, digits, and some punctuation. + * See utypes.h for details. + * + * The string parameter must be a C string literal. + * The length of the string, not including the terminating + * <code>NUL</code>, must be specified as a constant. + * @stable ICU 2.0 + */ +#if !U_CHAR16_IS_TYPEDEF +# define UNICODE_STRING(cs, _length) icu::UnicodeString(TRUE, u ## cs, _length) +#else +# define UNICODE_STRING(cs, _length) icu::UnicodeString(TRUE, (const char16_t*)u ## cs, _length) +#endif + +/** + * Unicode String literals in C++. + * Dependent on the platform properties, different UnicodeString + * constructors should be used to create a UnicodeString object from + * a string literal. + * The macros are defined for improved performance. + * They work only for strings that contain "invariant characters", i.e., + * only latin letters, digits, and some punctuation. + * See utypes.h for details. + * + * The string parameter must be a C string literal. + * @stable ICU 2.0 + */ +#define UNICODE_STRING_SIMPLE(cs) UNICODE_STRING(cs, -1) + +/** + * \def UNISTR_FROM_CHAR_EXPLICIT + * This can be defined to be empty or "explicit". + * If explicit, then the UnicodeString(char16_t) and UnicodeString(UChar32) + * constructors are marked as explicit, preventing their inadvertent use. + * @stable ICU 49 + */ +#ifndef UNISTR_FROM_CHAR_EXPLICIT +# if defined(U_COMBINED_IMPLEMENTATION) || defined(U_COMMON_IMPLEMENTATION) || defined(U_I18N_IMPLEMENTATION) || defined(U_IO_IMPLEMENTATION) + // Auto-"explicit" in ICU library code. +# define UNISTR_FROM_CHAR_EXPLICIT explicit +# else + // Empty by default for source code compatibility. +# define UNISTR_FROM_CHAR_EXPLICIT +# endif +#endif + +/** + * \def UNISTR_FROM_STRING_EXPLICIT + * This can be defined to be empty or "explicit". + * If explicit, then the UnicodeString(const char *) and UnicodeString(const char16_t *) + * constructors are marked as explicit, preventing their inadvertent use. + * + * In particular, this helps prevent accidentally depending on ICU conversion code + * by passing a string literal into an API with a const UnicodeString & parameter. + * @stable ICU 49 + */ +#ifndef UNISTR_FROM_STRING_EXPLICIT +# if defined(U_COMBINED_IMPLEMENTATION) || defined(U_COMMON_IMPLEMENTATION) || defined(U_I18N_IMPLEMENTATION) || defined(U_IO_IMPLEMENTATION) + // Auto-"explicit" in ICU library code. +# define UNISTR_FROM_STRING_EXPLICIT explicit +# else + // Empty by default for source code compatibility. +# define UNISTR_FROM_STRING_EXPLICIT +# endif +#endif + +/** + * \def UNISTR_OBJECT_SIZE + * Desired sizeof(UnicodeString) in bytes. + * It should be a multiple of sizeof(pointer) to avoid unusable space for padding. + * The object size may want to be a multiple of 16 bytes, + * which is a common granularity for heap allocation. + * + * Any space inside the object beyond sizeof(vtable pointer) + 2 + * is available for storing short strings inside the object. + * The bigger the object, the longer a string that can be stored inside the object, + * without additional heap allocation. + * + * Depending on a platform's pointer size, pointer alignment requirements, + * and struct padding, the compiler will usually round up sizeof(UnicodeString) + * to 4 * sizeof(pointer) (or 3 * sizeof(pointer) for P128 data models), + * to hold the fields for heap-allocated strings. + * Such a minimum size also ensures that the object is easily large enough + * to hold at least 2 char16_ts, for one supplementary code point (U16_MAX_LENGTH). + * + * sizeof(UnicodeString) >= 48 should work for all known platforms. + * + * For example, on a 64-bit machine where sizeof(vtable pointer) is 8, + * sizeof(UnicodeString) = 64 would leave space for + * (64 - sizeof(vtable pointer) - 2) / U_SIZEOF_UCHAR = (64 - 8 - 2) / 2 = 27 + * char16_ts stored inside the object. + * + * The minimum object size on a 64-bit machine would be + * 4 * sizeof(pointer) = 4 * 8 = 32 bytes, + * and the internal buffer would hold up to 11 char16_ts in that case. + * + * @see U16_MAX_LENGTH + * @stable ICU 56 + */ +#ifndef UNISTR_OBJECT_SIZE +# define UNISTR_OBJECT_SIZE 64 +#endif + +/** + * UnicodeString is a string class that stores Unicode characters directly and provides + * similar functionality as the Java String and StringBuffer/StringBuilder classes. + * It is a concrete implementation of the abstract class Replaceable (for transliteration). + * + * A UnicodeString may also "alias" an external array of characters + * (that is, point to it, rather than own the array) + * whose lifetime must then at least match the lifetime of the aliasing object. + * This aliasing may be preserved when returning a UnicodeString by value, + * depending on the compiler and the function implementation, + * via Return Value Optimization (RVO) or the move assignment operator. + * (However, the copy assignment operator does not preserve aliasing.) + * For details see the description of storage models at the end of the class API docs + * and in the User Guide chapter linked from there. + * + * The UnicodeString class is not suitable for subclassing. + * + * <p>For an overview of Unicode strings in C and C++ see the + * <a href="http://userguide.icu-project.org/strings#TOC-Strings-in-C-C-">User Guide Strings chapter</a>.</p> + * + * <p>In ICU, a Unicode string consists of 16-bit Unicode <em>code units</em>. + * A Unicode character may be stored with either one code unit + * (the most common case) or with a matched pair of special code units + * ("surrogates"). The data type for code units is char16_t. + * For single-character handling, a Unicode character code <em>point</em> is a value + * in the range 0..0x10ffff. ICU uses the UChar32 type for code points.</p> + * + * <p>Indexes and offsets into and lengths of strings always count code units, not code points. + * This is the same as with multi-byte char* strings in traditional string handling. + * Operations on partial strings typically do not test for code point boundaries. + * If necessary, the user needs to take care of such boundaries by testing for the code unit + * values or by using functions like + * UnicodeString::getChar32Start() and UnicodeString::getChar32Limit() + * (or, in C, the equivalent macros U16_SET_CP_START() and U16_SET_CP_LIMIT(), see utf.h).</p> + * + * UnicodeString methods are more lenient with regard to input parameter values + * than other ICU APIs. In particular: + * - If indexes are out of bounds for a UnicodeString object + * (<0 or >length()) then they are "pinned" to the nearest boundary. + * - If primitive string pointer values (e.g., const char16_t * or char *) + * for input strings are NULL, then those input string parameters are treated + * as if they pointed to an empty string. + * However, this is <em>not</em> the case for char * parameters for charset names + * or other IDs. + * - Most UnicodeString methods do not take a UErrorCode parameter because + * there are usually very few opportunities for failure other than a shortage + * of memory, error codes in low-level C++ string methods would be inconvenient, + * and the error code as the last parameter (ICU convention) would prevent + * the use of default parameter values. + * Instead, such methods set the UnicodeString into a "bogus" state + * (see isBogus()) if an error occurs. + * + * In string comparisons, two UnicodeString objects that are both "bogus" + * compare equal (to be transitive and prevent endless loops in sorting), + * and a "bogus" string compares less than any non-"bogus" one. + * + * Const UnicodeString methods are thread-safe. Multiple threads can use + * const methods on the same UnicodeString object simultaneously, + * but non-const methods must not be called concurrently (in multiple threads) + * with any other (const or non-const) methods. + * + * Similarly, const UnicodeString & parameters are thread-safe. + * One object may be passed in as such a parameter concurrently in multiple threads. + * This includes the const UnicodeString & parameters for + * copy construction, assignment, and cloning. + * + * <p>UnicodeString uses several storage methods. + * String contents can be stored inside the UnicodeString object itself, + * in an allocated and shared buffer, or in an outside buffer that is "aliased". + * Most of this is done transparently, but careful aliasing in particular provides + * significant performance improvements. + * Also, the internal buffer is accessible via special functions. + * For details see the + * <a href="http://userguide.icu-project.org/strings#TOC-Maximizing-Performance-with-the-UnicodeString-Storage-Model">User Guide Strings chapter</a>.</p> + * + * @see utf.h + * @see CharacterIterator + * @stable ICU 2.0 + */ +class U_COMMON_API UnicodeString : public Replaceable +{ +public: + + /** + * Constant to be used in the UnicodeString(char *, int32_t, EInvariant) constructor + * which constructs a Unicode string from an invariant-character char * string. + * Use the macro US_INV instead of the full qualification for this value. + * + * @see US_INV + * @stable ICU 3.2 + */ + enum EInvariant { + /** + * @see EInvariant + * @stable ICU 3.2 + */ + kInvariant + }; + + //======================================== + // Read-only operations + //======================================== + + /* Comparison - bitwise only - for international comparison use collation */ + + /** + * Equality operator. Performs only bitwise comparison. + * @param text The UnicodeString to compare to this one. + * @return TRUE if <TT>text</TT> contains the same characters as this one, + * FALSE otherwise. + * @stable ICU 2.0 + */ + inline UBool operator== (const UnicodeString& text) const; + + /** + * Inequality operator. Performs only bitwise comparison. + * @param text The UnicodeString to compare to this one. + * @return FALSE if <TT>text</TT> contains the same characters as this one, + * TRUE otherwise. + * @stable ICU 2.0 + */ + inline UBool operator!= (const UnicodeString& text) const; + + /** + * Greater than operator. Performs only bitwise comparison. + * @param text The UnicodeString to compare to this one. + * @return TRUE if the characters in this are bitwise + * greater than the characters in <code>text</code>, FALSE otherwise + * @stable ICU 2.0 + */ + inline UBool operator> (const UnicodeString& text) const; + + /** + * Less than operator. Performs only bitwise comparison. + * @param text The UnicodeString to compare to this one. + * @return TRUE if the characters in this are bitwise + * less than the characters in <code>text</code>, FALSE otherwise + * @stable ICU 2.0 + */ + inline UBool operator< (const UnicodeString& text) const; + + /** + * Greater than or equal operator. Performs only bitwise comparison. + * @param text The UnicodeString to compare to this one. + * @return TRUE if the characters in this are bitwise + * greater than or equal to the characters in <code>text</code>, FALSE otherwise + * @stable ICU 2.0 + */ + inline UBool operator>= (const UnicodeString& text) const; + + /** + * Less than or equal operator. Performs only bitwise comparison. + * @param text The UnicodeString to compare to this one. + * @return TRUE if the characters in this are bitwise + * less than or equal to the characters in <code>text</code>, FALSE otherwise + * @stable ICU 2.0 + */ + inline UBool operator<= (const UnicodeString& text) const; + + /** + * Compare the characters bitwise in this UnicodeString to + * the characters in <code>text</code>. + * @param text The UnicodeString to compare to this one. + * @return The result of bitwise character comparison: 0 if this + * contains the same characters as <code>text</code>, -1 if the characters in + * this are bitwise less than the characters in <code>text</code>, +1 if the + * characters in this are bitwise greater than the characters + * in <code>text</code>. + * @stable ICU 2.0 + */ + inline int8_t compare(const UnicodeString& text) const; + + /** + * Compare the characters bitwise in the range + * [<TT>start</TT>, <TT>start + length</TT>) with the characters + * in the <b>entire string</b> <TT>text</TT>. + * (The parameters "start" and "length" are not applied to the other text "text".) + * @param start the offset at which the compare operation begins + * @param length the number of characters of text to compare. + * @param text the other text to be compared against this string. + * @return The result of bitwise character comparison: 0 if this + * contains the same characters as <code>text</code>, -1 if the characters in + * this are bitwise less than the characters in <code>text</code>, +1 if the + * characters in this are bitwise greater than the characters + * in <code>text</code>. + * @stable ICU 2.0 + */ + inline int8_t compare(int32_t start, + int32_t length, + const UnicodeString& text) const; + + /** + * Compare the characters bitwise in the range + * [<TT>start</TT>, <TT>start + length</TT>) with the characters + * in <TT>srcText</TT> in the range + * [<TT>srcStart</TT>, <TT>srcStart + srcLength</TT>). + * @param start the offset at which the compare operation begins + * @param length the number of characters in this to compare. + * @param srcText the text to be compared + * @param srcStart the offset into <TT>srcText</TT> to start comparison + * @param srcLength the number of characters in <TT>src</TT> to compare + * @return The result of bitwise character comparison: 0 if this + * contains the same characters as <code>srcText</code>, -1 if the characters in + * this are bitwise less than the characters in <code>srcText</code>, +1 if the + * characters in this are bitwise greater than the characters + * in <code>srcText</code>. + * @stable ICU 2.0 + */ + inline int8_t compare(int32_t start, + int32_t length, + const UnicodeString& srcText, + int32_t srcStart, + int32_t srcLength) const; + + /** + * Compare the characters bitwise in this UnicodeString with the first + * <TT>srcLength</TT> characters in <TT>srcChars</TT>. + * @param srcChars The characters to compare to this UnicodeString. + * @param srcLength the number of characters in <TT>srcChars</TT> to compare + * @return The result of bitwise character comparison: 0 if this + * contains the same characters as <code>srcChars</code>, -1 if the characters in + * this are bitwise less than the characters in <code>srcChars</code>, +1 if the + * characters in this are bitwise greater than the characters + * in <code>srcChars</code>. + * @stable ICU 2.0 + */ + inline int8_t compare(ConstChar16Ptr srcChars, + int32_t srcLength) const; + + /** + * Compare the characters bitwise in the range + * [<TT>start</TT>, <TT>start + length</TT>) with the first + * <TT>length</TT> characters in <TT>srcChars</TT> + * @param start the offset at which the compare operation begins + * @param length the number of characters to compare. + * @param srcChars the characters to be compared + * @return The result of bitwise character comparison: 0 if this + * contains the same characters as <code>srcChars</code>, -1 if the characters in + * this are bitwise less than the characters in <code>srcChars</code>, +1 if the + * characters in this are bitwise greater than the characters + * in <code>srcChars</code>. + * @stable ICU 2.0 + */ + inline int8_t compare(int32_t start, + int32_t length, + const char16_t *srcChars) const; + + /** + * Compare the characters bitwise in the range + * [<TT>start</TT>, <TT>start + length</TT>) with the characters + * in <TT>srcChars</TT> in the range + * [<TT>srcStart</TT>, <TT>srcStart + srcLength</TT>). + * @param start the offset at which the compare operation begins + * @param length the number of characters in this to compare + * @param srcChars the characters to be compared + * @param srcStart the offset into <TT>srcChars</TT> to start comparison + * @param srcLength the number of characters in <TT>srcChars</TT> to compare + * @return The result of bitwise character comparison: 0 if this + * contains the same characters as <code>srcChars</code>, -1 if the characters in + * this are bitwise less than the characters in <code>srcChars</code>, +1 if the + * characters in this are bitwise greater than the characters + * in <code>srcChars</code>. + * @stable ICU 2.0 + */ + inline int8_t compare(int32_t start, + int32_t length, + const char16_t *srcChars, + int32_t srcStart, + int32_t srcLength) const; + + /** + * Compare the characters bitwise in the range + * [<TT>start</TT>, <TT>limit</TT>) with the characters + * in <TT>srcText</TT> in the range + * [<TT>srcStart</TT>, <TT>srcLimit</TT>). + * @param start the offset at which the compare operation begins + * @param limit the offset immediately following the compare operation + * @param srcText the text to be compared + * @param srcStart the offset into <TT>srcText</TT> to start comparison + * @param srcLimit the offset into <TT>srcText</TT> to limit comparison + * @return The result of bitwise character comparison: 0 if this + * contains the same characters as <code>srcText</code>, -1 if the characters in + * this are bitwise less than the characters in <code>srcText</code>, +1 if the + * characters in this are bitwise greater than the characters + * in <code>srcText</code>. + * @stable ICU 2.0 + */ + inline int8_t compareBetween(int32_t start, + int32_t limit, + const UnicodeString& srcText, + int32_t srcStart, + int32_t srcLimit) const; + + /** + * Compare two Unicode strings in code point order. + * The result may be different from the results of compare(), operator<, etc. + * if supplementary characters are present: + * + * In UTF-16, supplementary characters (with code points U+10000 and above) are + * stored with pairs of surrogate code units. These have values from 0xd800 to 0xdfff, + * which means that they compare as less than some other BMP characters like U+feff. + * This function compares Unicode strings in code point order. + * If either of the UTF-16 strings is malformed (i.e., it contains unpaired surrogates), then the result is not defined. + * + * @param text Another string to compare this one to. + * @return a negative/zero/positive integer corresponding to whether + * this string is less than/equal to/greater than the second one + * in code point order + * @stable ICU 2.0 + */ + inline int8_t compareCodePointOrder(const UnicodeString& text) const; + + /** + * Compare two Unicode strings in code point order. + * The result may be different from the results of compare(), operator<, etc. + * if supplementary characters are present: + * + * In UTF-16, supplementary characters (with code points U+10000 and above) are + * stored with pairs of surrogate code units. These have values from 0xd800 to 0xdfff, + * which means that they compare as less than some other BMP characters like U+feff. + * This function compares Unicode strings in code point order. + * If either of the UTF-16 strings is malformed (i.e., it contains unpaired surrogates), then the result is not defined. + * + * @param start The start offset in this string at which the compare operation begins. + * @param length The number of code units from this string to compare. + * @param srcText Another string to compare this one to. + * @return a negative/zero/positive integer corresponding to whether + * this string is less than/equal to/greater than the second one + * in code point order + * @stable ICU 2.0 + */ + inline int8_t compareCodePointOrder(int32_t start, + int32_t length, + const UnicodeString& srcText) const; + + /** + * Compare two Unicode strings in code point order. + * The result may be different from the results of compare(), operator<, etc. + * if supplementary characters are present: + * + * In UTF-16, supplementary characters (with code points U+10000 and above) are + * stored with pairs of surrogate code units. These have values from 0xd800 to 0xdfff, + * which means that they compare as less than some other BMP characters like U+feff. + * This function compares Unicode strings in code point order. + * If either of the UTF-16 strings is malformed (i.e., it contains unpaired surrogates), then the result is not defined. + * + * @param start The start offset in this string at which the compare operation begins. + * @param length The number of code units from this string to compare. + * @param srcText Another string to compare this one to. + * @param srcStart The start offset in that string at which the compare operation begins. + * @param srcLength The number of code units from that string to compare. + * @return a negative/zero/positive integer corresponding to whether + * this string is less than/equal to/greater than the second one + * in code point order + * @stable ICU 2.0 + */ + inline int8_t compareCodePointOrder(int32_t start, + int32_t length, + const UnicodeString& srcText, + int32_t srcStart, + int32_t srcLength) const; + + /** + * Compare two Unicode strings in code point order. + * The result may be different from the results of compare(), operator<, etc. + * if supplementary characters are present: + * + * In UTF-16, supplementary characters (with code points U+10000 and above) are + * stored with pairs of surrogate code units. These have values from 0xd800 to 0xdfff, + * which means that they compare as less than some other BMP characters like U+feff. + * This function compares Unicode strings in code point order. + * If either of the UTF-16 strings is malformed (i.e., it contains unpaired surrogates), then the result is not defined. + * + * @param srcChars A pointer to another string to compare this one to. + * @param srcLength The number of code units from that string to compare. + * @return a negative/zero/positive integer corresponding to whether + * this string is less than/equal to/greater than the second one + * in code point order + * @stable ICU 2.0 + */ + inline int8_t compareCodePointOrder(ConstChar16Ptr srcChars, + int32_t srcLength) const; + + /** + * Compare two Unicode strings in code point order. + * The result may be different from the results of compare(), operator<, etc. + * if supplementary characters are present: + * + * In UTF-16, supplementary characters (with code points U+10000 and above) are + * stored with pairs of surrogate code units. These have values from 0xd800 to 0xdfff, + * which means that they compare as less than some other BMP characters like U+feff. + * This function compares Unicode strings in code point order. + * If either of the UTF-16 strings is malformed (i.e., it contains unpaired surrogates), then the result is not defined. + * + * @param start The start offset in this string at which the compare operation begins. + * @param length The number of code units from this string to compare. + * @param srcChars A pointer to another string to compare this one to. + * @return a negative/zero/positive integer corresponding to whether + * this string is less than/equal to/greater than the second one + * in code point order + * @stable ICU 2.0 + */ + inline int8_t compareCodePointOrder(int32_t start, + int32_t length, + const char16_t *srcChars) const; + + /** + * Compare two Unicode strings in code point order. + * The result may be different from the results of compare(), operator<, etc. + * if supplementary characters are present: + * + * In UTF-16, supplementary characters (with code points U+10000 and above) are + * stored with pairs of surrogate code units. These have values from 0xd800 to 0xdfff, + * which means that they compare as less than some other BMP characters like U+feff. + * This function compares Unicode strings in code point order. + * If either of the UTF-16 strings is malformed (i.e., it contains unpaired surrogates), then the result is not defined. + * + * @param start The start offset in this string at which the compare operation begins. + * @param length The number of code units from this string to compare. + * @param srcChars A pointer to another string to compare this one to. + * @param srcStart The start offset in that string at which the compare operation begins. + * @param srcLength The number of code units from that string to compare. + * @return a negative/zero/positive integer corresponding to whether + * this string is less than/equal to/greater than the second one + * in code point order + * @stable ICU 2.0 + */ + inline int8_t compareCodePointOrder(int32_t start, + int32_t length, + const char16_t *srcChars, + int32_t srcStart, + int32_t srcLength) const; + + /** + * Compare two Unicode strings in code point order. + * The result may be different from the results of compare(), operator<, etc. + * if supplementary characters are present: + * + * In UTF-16, supplementary characters (with code points U+10000 and above) are + * stored with pairs of surrogate code units. These have values from 0xd800 to 0xdfff, + * which means that they compare as less than some other BMP characters like U+feff. + * This function compares Unicode strings in code point order. + * If either of the UTF-16 strings is malformed (i.e., it contains unpaired surrogates), then the result is not defined. + * + * @param start The start offset in this string at which the compare operation begins. + * @param limit The offset after the last code unit from this string to compare. + * @param srcText Another string to compare this one to. + * @param srcStart The start offset in that string at which the compare operation begins. + * @param srcLimit The offset after the last code unit from that string to compare. + * @return a negative/zero/positive integer corresponding to whether + * this string is less than/equal to/greater than the second one + * in code point order + * @stable ICU 2.0 + */ + inline int8_t compareCodePointOrderBetween(int32_t start, + int32_t limit, + const UnicodeString& srcText, + int32_t srcStart, + int32_t srcLimit) const; + + /** + * Compare two strings case-insensitively using full case folding. + * This is equivalent to this->foldCase(options).compare(text.foldCase(options)). + * + * @param text Another string to compare this one to. + * @param options A bit set of options: + * - U_FOLD_CASE_DEFAULT or 0 is used for default options: + * Comparison in code unit order with default case folding. + * + * - U_COMPARE_CODE_POINT_ORDER + * Set to choose code point order instead of code unit order + * (see u_strCompare for details). + * + * - U_FOLD_CASE_EXCLUDE_SPECIAL_I + * + * @return A negative, zero, or positive integer indicating the comparison result. + * @stable ICU 2.0 + */ + inline int8_t caseCompare(const UnicodeString& text, uint32_t options) const; + + /** + * Compare two strings case-insensitively using full case folding. + * This is equivalent to this->foldCase(options).compare(srcText.foldCase(options)). + * + * @param start The start offset in this string at which the compare operation begins. + * @param length The number of code units from this string to compare. + * @param srcText Another string to compare this one to. + * @param options A bit set of options: + * - U_FOLD_CASE_DEFAULT or 0 is used for default options: + * Comparison in code unit order with default case folding. + * + * - U_COMPARE_CODE_POINT_ORDER + * Set to choose code point order instead of code unit order + * (see u_strCompare for details). + * + * - U_FOLD_CASE_EXCLUDE_SPECIAL_I + * + * @return A negative, zero, or positive integer indicating the comparison result. + * @stable ICU 2.0 + */ + inline int8_t caseCompare(int32_t start, + int32_t length, + const UnicodeString& srcText, + uint32_t options) const; + + /** + * Compare two strings case-insensitively using full case folding. + * This is equivalent to this->foldCase(options).compare(srcText.foldCase(options)). + * + * @param start The start offset in this string at which the compare operation begins. + * @param length The number of code units from this string to compare. + * @param srcText Another string to compare this one to. + * @param srcStart The start offset in that string at which the compare operation begins. + * @param srcLength The number of code units from that string to compare. + * @param options A bit set of options: + * - U_FOLD_CASE_DEFAULT or 0 is used for default options: + * Comparison in code unit order with default case folding. + * + * - U_COMPARE_CODE_POINT_ORDER + * Set to choose code point order instead of code unit order + * (see u_strCompare for details). + * + * - U_FOLD_CASE_EXCLUDE_SPECIAL_I + * + * @return A negative, zero, or positive integer indicating the comparison result. + * @stable ICU 2.0 + */ + inline int8_t caseCompare(int32_t start, + int32_t length, + const UnicodeString& srcText, + int32_t srcStart, + int32_t srcLength, + uint32_t options) const; + + /** + * Compare two strings case-insensitively using full case folding. + * This is equivalent to this->foldCase(options).compare(srcChars.foldCase(options)). + * + * @param srcChars A pointer to another string to compare this one to. + * @param srcLength The number of code units from that string to compare. + * @param options A bit set of options: + * - U_FOLD_CASE_DEFAULT or 0 is used for default options: + * Comparison in code unit order with default case folding. + * + * - U_COMPARE_CODE_POINT_ORDER + * Set to choose code point order instead of code unit order + * (see u_strCompare for details). + * + * - U_FOLD_CASE_EXCLUDE_SPECIAL_I + * + * @return A negative, zero, or positive integer indicating the comparison result. + * @stable ICU 2.0 + */ + inline int8_t caseCompare(ConstChar16Ptr srcChars, + int32_t srcLength, + uint32_t options) const; + + /** + * Compare two strings case-insensitively using full case folding. + * This is equivalent to this->foldCase(options).compare(srcChars.foldCase(options)). + * + * @param start The start offset in this string at which the compare operation begins. + * @param length The number of code units from this string to compare. + * @param srcChars A pointer to another string to compare this one to. + * @param options A bit set of options: + * - U_FOLD_CASE_DEFAULT or 0 is used for default options: + * Comparison in code unit order with default case folding. + * + * - U_COMPARE_CODE_POINT_ORDER + * Set to choose code point order instead of code unit order + * (see u_strCompare for details). + * + * - U_FOLD_CASE_EXCLUDE_SPECIAL_I + * + * @return A negative, zero, or positive integer indicating the comparison result. + * @stable ICU 2.0 + */ + inline int8_t caseCompare(int32_t start, + int32_t length, + const char16_t *srcChars, + uint32_t options) const; + + /** + * Compare two strings case-insensitively using full case folding. + * This is equivalent to this->foldCase(options).compare(srcChars.foldCase(options)). + * + * @param start The start offset in this string at which the compare operation begins. + * @param length The number of code units from this string to compare. + * @param srcChars A pointer to another string to compare this one to. + * @param srcStart The start offset in that string at which the compare operation begins. + * @param srcLength The number of code units from that string to compare. + * @param options A bit set of options: + * - U_FOLD_CASE_DEFAULT or 0 is used for default options: + * Comparison in code unit order with default case folding. + * + * - U_COMPARE_CODE_POINT_ORDER + * Set to choose code point order instead of code unit order + * (see u_strCompare for details). + * + * - U_FOLD_CASE_EXCLUDE_SPECIAL_I + * + * @return A negative, zero, or positive integer indicating the comparison result. + * @stable ICU 2.0 + */ + inline int8_t caseCompare(int32_t start, + int32_t length, + const char16_t *srcChars, + int32_t srcStart, + int32_t srcLength, + uint32_t options) const; + + /** + * Compare two strings case-insensitively using full case folding. + * This is equivalent to this->foldCase(options).compareBetween(text.foldCase(options)). + * + * @param start The start offset in this string at which the compare operation begins. + * @param limit The offset after the last code unit from this string to compare. + * @param srcText Another string to compare this one to. + * @param srcStart The start offset in that string at which the compare operation begins. + * @param srcLimit The offset after the last code unit from that string to compare. + * @param options A bit set of options: + * - U_FOLD_CASE_DEFAULT or 0 is used for default options: + * Comparison in code unit order with default case folding. + * + * - U_COMPARE_CODE_POINT_ORDER + * Set to choose code point order instead of code unit order + * (see u_strCompare for details). + * + * - U_FOLD_CASE_EXCLUDE_SPECIAL_I + * + * @return A negative, zero, or positive integer indicating the comparison result. + * @stable ICU 2.0 + */ + inline int8_t caseCompareBetween(int32_t start, + int32_t limit, + const UnicodeString& srcText, + int32_t srcStart, + int32_t srcLimit, + uint32_t options) const; + + /** + * Determine if this starts with the characters in <TT>text</TT> + * @param text The text to match. + * @return TRUE if this starts with the characters in <TT>text</TT>, + * FALSE otherwise + * @stable ICU 2.0 + */ + inline UBool startsWith(const UnicodeString& text) const; + + /** + * Determine if this starts with the characters in <TT>srcText</TT> + * in the range [<TT>srcStart</TT>, <TT>srcStart + srcLength</TT>). + * @param srcText The text to match. + * @param srcStart the offset into <TT>srcText</TT> to start matching + * @param srcLength the number of characters in <TT>srcText</TT> to match + * @return TRUE if this starts with the characters in <TT>text</TT>, + * FALSE otherwise + * @stable ICU 2.0 + */ + inline UBool startsWith(const UnicodeString& srcText, + int32_t srcStart, + int32_t srcLength) const; + + /** + * Determine if this starts with the characters in <TT>srcChars</TT> + * @param srcChars The characters to match. + * @param srcLength the number of characters in <TT>srcChars</TT> + * @return TRUE if this starts with the characters in <TT>srcChars</TT>, + * FALSE otherwise + * @stable ICU 2.0 + */ + inline UBool startsWith(ConstChar16Ptr srcChars, + int32_t srcLength) const; + + /** + * Determine if this ends with the characters in <TT>srcChars</TT> + * in the range [<TT>srcStart</TT>, <TT>srcStart + srcLength</TT>). + * @param srcChars The characters to match. + * @param srcStart the offset into <TT>srcText</TT> to start matching + * @param srcLength the number of characters in <TT>srcChars</TT> to match + * @return TRUE if this ends with the characters in <TT>srcChars</TT>, FALSE otherwise + * @stable ICU 2.0 + */ + inline UBool startsWith(const char16_t *srcChars, + int32_t srcStart, + int32_t srcLength) const; + + /** + * Determine if this ends with the characters in <TT>text</TT> + * @param text The text to match. + * @return TRUE if this ends with the characters in <TT>text</TT>, + * FALSE otherwise + * @stable ICU 2.0 + */ + inline UBool endsWith(const UnicodeString& text) const; + + /** + * Determine if this ends with the characters in <TT>srcText</TT> + * in the range [<TT>srcStart</TT>, <TT>srcStart + srcLength</TT>). + * @param srcText The text to match. + * @param srcStart the offset into <TT>srcText</TT> to start matching + * @param srcLength the number of characters in <TT>srcText</TT> to match + * @return TRUE if this ends with the characters in <TT>text</TT>, + * FALSE otherwise + * @stable ICU 2.0 + */ + inline UBool endsWith(const UnicodeString& srcText, + int32_t srcStart, + int32_t srcLength) const; + + /** + * Determine if this ends with the characters in <TT>srcChars</TT> + * @param srcChars The characters to match. + * @param srcLength the number of characters in <TT>srcChars</TT> + * @return TRUE if this ends with the characters in <TT>srcChars</TT>, + * FALSE otherwise + * @stable ICU 2.0 + */ + inline UBool endsWith(ConstChar16Ptr srcChars, + int32_t srcLength) const; + + /** + * Determine if this ends with the characters in <TT>srcChars</TT> + * in the range [<TT>srcStart</TT>, <TT>srcStart + srcLength</TT>). + * @param srcChars The characters to match. + * @param srcStart the offset into <TT>srcText</TT> to start matching + * @param srcLength the number of characters in <TT>srcChars</TT> to match + * @return TRUE if this ends with the characters in <TT>srcChars</TT>, + * FALSE otherwise + * @stable ICU 2.0 + */ + inline UBool endsWith(const char16_t *srcChars, + int32_t srcStart, + int32_t srcLength) const; + + + /* Searching - bitwise only */ + + /** + * Locate in this the first occurrence of the characters in <TT>text</TT>, + * using bitwise comparison. + * @param text The text to search for. + * @return The offset into this of the start of <TT>text</TT>, + * or -1 if not found. + * @stable ICU 2.0 + */ + inline int32_t indexOf(const UnicodeString& text) const; + + /** + * Locate in this the first occurrence of the characters in <TT>text</TT> + * starting at offset <TT>start</TT>, using bitwise comparison. + * @param text The text to search for. + * @param start The offset at which searching will start. + * @return The offset into this of the start of <TT>text</TT>, + * or -1 if not found. + * @stable ICU 2.0 + */ + inline int32_t indexOf(const UnicodeString& text, + int32_t start) const; + + /** + * Locate in this the first occurrence in the range + * [<TT>start</TT>, <TT>start + length</TT>) of the characters + * in <TT>text</TT>, using bitwise comparison. + * @param text The text to search for. + * @param start The offset at which searching will start. + * @param length The number of characters to search + * @return The offset into this of the start of <TT>text</TT>, + * or -1 if not found. + * @stable ICU 2.0 + */ + inline int32_t indexOf(const UnicodeString& text, + int32_t start, + int32_t length) const; + + /** + * Locate in this the first occurrence in the range + * [<TT>start</TT>, <TT>start + length</TT>) of the characters + * in <TT>srcText</TT> in the range + * [<TT>srcStart</TT>, <TT>srcStart + srcLength</TT>), + * using bitwise comparison. + * @param srcText The text to search for. + * @param srcStart the offset into <TT>srcText</TT> at which + * to start matching + * @param srcLength the number of characters in <TT>srcText</TT> to match + * @param start the offset into this at which to start matching + * @param length the number of characters in this to search + * @return The offset into this of the start of <TT>text</TT>, + * or -1 if not found. + * @stable ICU 2.0 + */ + inline int32_t indexOf(const UnicodeString& srcText, + int32_t srcStart, + int32_t srcLength, + int32_t start, + int32_t length) const; + + /** + * Locate in this the first occurrence of the characters in + * <TT>srcChars</TT> + * starting at offset <TT>start</TT>, using bitwise comparison. + * @param srcChars The text to search for. + * @param srcLength the number of characters in <TT>srcChars</TT> to match + * @param start the offset into this at which to start matching + * @return The offset into this of the start of <TT>text</TT>, + * or -1 if not found. + * @stable ICU 2.0 + */ + inline int32_t indexOf(const char16_t *srcChars, + int32_t srcLength, + int32_t start) const; + + /** + * Locate in this the first occurrence in the range + * [<TT>start</TT>, <TT>start + length</TT>) of the characters + * in <TT>srcChars</TT>, using bitwise comparison. + * @param srcChars The text to search for. + * @param srcLength the number of characters in <TT>srcChars</TT> + * @param start The offset at which searching will start. + * @param length The number of characters to search + * @return The offset into this of the start of <TT>srcChars</TT>, + * or -1 if not found. + * @stable ICU 2.0 + */ + inline int32_t indexOf(ConstChar16Ptr srcChars, + int32_t srcLength, + int32_t start, + int32_t length) const; + + /** + * Locate in this the first occurrence in the range + * [<TT>start</TT>, <TT>start + length</TT>) of the characters + * in <TT>srcChars</TT> in the range + * [<TT>srcStart</TT>, <TT>srcStart + srcLength</TT>), + * using bitwise comparison. + * @param srcChars The text to search for. + * @param srcStart the offset into <TT>srcChars</TT> at which + * to start matching + * @param srcLength the number of characters in <TT>srcChars</TT> to match + * @param start the offset into this at which to start matching + * @param length the number of characters in this to search + * @return The offset into this of the start of <TT>text</TT>, + * or -1 if not found. + * @stable ICU 2.0 + */ + int32_t indexOf(const char16_t *srcChars, + int32_t srcStart, + int32_t srcLength, + int32_t start, + int32_t length) const; + + /** + * Locate in this the first occurrence of the BMP code point <code>c</code>, + * using bitwise comparison. + * @param c The code unit to search for. + * @return The offset into this of <TT>c</TT>, or -1 if not found. + * @stable ICU 2.0 + */ + inline int32_t indexOf(char16_t c) const; + + /** + * Locate in this the first occurrence of the code point <TT>c</TT>, + * using bitwise comparison. + * + * @param c The code point to search for. + * @return The offset into this of <TT>c</TT>, or -1 if not found. + * @stable ICU 2.0 + */ + inline int32_t indexOf(UChar32 c) const; + + /** + * Locate in this the first occurrence of the BMP code point <code>c</code>, + * starting at offset <TT>start</TT>, using bitwise comparison. + * @param c The code unit to search for. + * @param start The offset at which searching will start. + * @return The offset into this of <TT>c</TT>, or -1 if not found. + * @stable ICU 2.0 + */ + inline int32_t indexOf(char16_t c, + int32_t start) const; + + /** + * Locate in this the first occurrence of the code point <TT>c</TT> + * starting at offset <TT>start</TT>, using bitwise comparison. + * + * @param c The code point to search for. + * @param start The offset at which searching will start. + * @return The offset into this of <TT>c</TT>, or -1 if not found. + * @stable ICU 2.0 + */ + inline int32_t indexOf(UChar32 c, + int32_t start) const; + + /** + * Locate in this the first occurrence of the BMP code point <code>c</code> + * in the range [<TT>start</TT>, <TT>start + length</TT>), + * using bitwise comparison. + * @param c The code unit to search for. + * @param start the offset into this at which to start matching + * @param length the number of characters in this to search + * @return The offset into this of <TT>c</TT>, or -1 if not found. + * @stable ICU 2.0 + */ + inline int32_t indexOf(char16_t c, + int32_t start, + int32_t length) const; + + /** + * Locate in this the first occurrence of the code point <TT>c</TT> + * in the range [<TT>start</TT>, <TT>start + length</TT>), + * using bitwise comparison. + * + * @param c The code point to search for. + * @param start the offset into this at which to start matching + * @param length the number of characters in this to search + * @return The offset into this of <TT>c</TT>, or -1 if not found. + * @stable ICU 2.0 + */ + inline int32_t indexOf(UChar32 c, + int32_t start, + int32_t length) const; + + /** + * Locate in this the last occurrence of the characters in <TT>text</TT>, + * using bitwise comparison. + * @param text The text to search for. + * @return The offset into this of the start of <TT>text</TT>, + * or -1 if not found. + * @stable ICU 2.0 + */ + inline int32_t lastIndexOf(const UnicodeString& text) const; + + /** + * Locate in this the last occurrence of the characters in <TT>text</TT> + * starting at offset <TT>start</TT>, using bitwise comparison. + * @param text The text to search for. + * @param start The offset at which searching will start. + * @return The offset into this of the start of <TT>text</TT>, + * or -1 if not found. + * @stable ICU 2.0 + */ + inline int32_t lastIndexOf(const UnicodeString& text, + int32_t start) const; + + /** + * Locate in this the last occurrence in the range + * [<TT>start</TT>, <TT>start + length</TT>) of the characters + * in <TT>text</TT>, using bitwise comparison. + * @param text The text to search for. + * @param start The offset at which searching will start. + * @param length The number of characters to search + * @return The offset into this of the start of <TT>text</TT>, + * or -1 if not found. + * @stable ICU 2.0 + */ + inline int32_t lastIndexOf(const UnicodeString& text, + int32_t start, + int32_t length) const; + + /** + * Locate in this the last occurrence in the range + * [<TT>start</TT>, <TT>start + length</TT>) of the characters + * in <TT>srcText</TT> in the range + * [<TT>srcStart</TT>, <TT>srcStart + srcLength</TT>), + * using bitwise comparison. + * @param srcText The text to search for. + * @param srcStart the offset into <TT>srcText</TT> at which + * to start matching + * @param srcLength the number of characters in <TT>srcText</TT> to match + * @param start the offset into this at which to start matching + * @param length the number of characters in this to search + * @return The offset into this of the start of <TT>text</TT>, + * or -1 if not found. + * @stable ICU 2.0 + */ + inline int32_t lastIndexOf(const UnicodeString& srcText, + int32_t srcStart, + int32_t srcLength, + int32_t start, + int32_t length) const; + + /** + * Locate in this the last occurrence of the characters in <TT>srcChars</TT> + * starting at offset <TT>start</TT>, using bitwise comparison. + * @param srcChars The text to search for. + * @param srcLength the number of characters in <TT>srcChars</TT> to match + * @param start the offset into this at which to start matching + * @return The offset into this of the start of <TT>text</TT>, + * or -1 if not found. + * @stable ICU 2.0 + */ + inline int32_t lastIndexOf(const char16_t *srcChars, + int32_t srcLength, + int32_t start) const; + + /** + * Locate in this the last occurrence in the range + * [<TT>start</TT>, <TT>start + length</TT>) of the characters + * in <TT>srcChars</TT>, using bitwise comparison. + * @param srcChars The text to search for. + * @param srcLength the number of characters in <TT>srcChars</TT> + * @param start The offset at which searching will start. + * @param length The number of characters to search + * @return The offset into this of the start of <TT>srcChars</TT>, + * or -1 if not found. + * @stable ICU 2.0 + */ + inline int32_t lastIndexOf(ConstChar16Ptr srcChars, + int32_t srcLength, + int32_t start, + int32_t length) const; + + /** + * Locate in this the last occurrence in the range + * [<TT>start</TT>, <TT>start + length</TT>) of the characters + * in <TT>srcChars</TT> in the range + * [<TT>srcStart</TT>, <TT>srcStart + srcLength</TT>), + * using bitwise comparison. + * @param srcChars The text to search for. + * @param srcStart the offset into <TT>srcChars</TT> at which + * to start matching + * @param srcLength the number of characters in <TT>srcChars</TT> to match + * @param start the offset into this at which to start matching + * @param length the number of characters in this to search + * @return The offset into this of the start of <TT>text</TT>, + * or -1 if not found. + * @stable ICU 2.0 + */ + int32_t lastIndexOf(const char16_t *srcChars, + int32_t srcStart, + int32_t srcLength, + int32_t start, + int32_t length) const; + + /** + * Locate in this the last occurrence of the BMP code point <code>c</code>, + * using bitwise comparison. + * @param c The code unit to search for. + * @return The offset into this of <TT>c</TT>, or -1 if not found. + * @stable ICU 2.0 + */ + inline int32_t lastIndexOf(char16_t c) const; + + /** + * Locate in this the last occurrence of the code point <TT>c</TT>, + * using bitwise comparison. + * + * @param c The code point to search for. + * @return The offset into this of <TT>c</TT>, or -1 if not found. + * @stable ICU 2.0 + */ + inline int32_t lastIndexOf(UChar32 c) const; + + /** + * Locate in this the last occurrence of the BMP code point <code>c</code> + * starting at offset <TT>start</TT>, using bitwise comparison. + * @param c The code unit to search for. + * @param start The offset at which searching will start. + * @return The offset into this of <TT>c</TT>, or -1 if not found. + * @stable ICU 2.0 + */ + inline int32_t lastIndexOf(char16_t c, + int32_t start) const; + + /** + * Locate in this the last occurrence of the code point <TT>c</TT> + * starting at offset <TT>start</TT>, using bitwise comparison. + * + * @param c The code point to search for. + * @param start The offset at which searching will start. + * @return The offset into this of <TT>c</TT>, or -1 if not found. + * @stable ICU 2.0 + */ + inline int32_t lastIndexOf(UChar32 c, + int32_t start) const; + + /** + * Locate in this the last occurrence of the BMP code point <code>c</code> + * in the range [<TT>start</TT>, <TT>start + length</TT>), + * using bitwise comparison. + * @param c The code unit to search for. + * @param start the offset into this at which to start matching + * @param length the number of characters in this to search + * @return The offset into this of <TT>c</TT>, or -1 if not found. + * @stable ICU 2.0 + */ + inline int32_t lastIndexOf(char16_t c, + int32_t start, + int32_t length) const; + + /** + * Locate in this the last occurrence of the code point <TT>c</TT> + * in the range [<TT>start</TT>, <TT>start + length</TT>), + * using bitwise comparison. + * + * @param c The code point to search for. + * @param start the offset into this at which to start matching + * @param length the number of characters in this to search + * @return The offset into this of <TT>c</TT>, or -1 if not found. + * @stable ICU 2.0 + */ + inline int32_t lastIndexOf(UChar32 c, + int32_t start, + int32_t length) const; + + + /* Character access */ + + /** + * Return the code unit at offset <tt>offset</tt>. + * If the offset is not valid (0..length()-1) then U+ffff is returned. + * @param offset a valid offset into the text + * @return the code unit at offset <tt>offset</tt> + * or 0xffff if the offset is not valid for this string + * @stable ICU 2.0 + */ + inline char16_t charAt(int32_t offset) const; + + /** + * Return the code unit at offset <tt>offset</tt>. + * If the offset is not valid (0..length()-1) then U+ffff is returned. + * @param offset a valid offset into the text + * @return the code unit at offset <tt>offset</tt> + * @stable ICU 2.0 + */ + inline char16_t operator[] (int32_t offset) const; + + /** + * Return the code point that contains the code unit + * at offset <tt>offset</tt>. + * If the offset is not valid (0..length()-1) then U+ffff is returned. + * @param offset a valid offset into the text + * that indicates the text offset of any of the code units + * that will be assembled into a code point (21-bit value) and returned + * @return the code point of text at <tt>offset</tt> + * or 0xffff if the offset is not valid for this string + * @stable ICU 2.0 + */ + UChar32 char32At(int32_t offset) const; + + /** + * Adjust a random-access offset so that + * it points to the beginning of a Unicode character. + * The offset that is passed in points to + * any code unit of a code point, + * while the returned offset will point to the first code unit + * of the same code point. + * In UTF-16, if the input offset points to a second surrogate + * of a surrogate pair, then the returned offset will point + * to the first surrogate. + * @param offset a valid offset into one code point of the text + * @return offset of the first code unit of the same code point + * @see U16_SET_CP_START + * @stable ICU 2.0 + */ + int32_t getChar32Start(int32_t offset) const; + + /** + * Adjust a random-access offset so that + * it points behind a Unicode character. + * The offset that is passed in points behind + * any code unit of a code point, + * while the returned offset will point behind the last code unit + * of the same code point. + * In UTF-16, if the input offset points behind the first surrogate + * (i.e., to the second surrogate) + * of a surrogate pair, then the returned offset will point + * behind the second surrogate (i.e., to the first surrogate). + * @param offset a valid offset after any code unit of a code point of the text + * @return offset of the first code unit after the same code point + * @see U16_SET_CP_LIMIT + * @stable ICU 2.0 + */ + int32_t getChar32Limit(int32_t offset) const; + + /** + * Move the code unit index along the string by delta code points. + * Interpret the input index as a code unit-based offset into the string, + * move the index forward or backward by delta code points, and + * return the resulting index. + * The input index should point to the first code unit of a code point, + * if there is more than one. + * + * Both input and output indexes are code unit-based as for all + * string indexes/offsets in ICU (and other libraries, like MBCS char*). + * If delta<0 then the index is moved backward (toward the start of the string). + * If delta>0 then the index is moved forward (toward the end of the string). + * + * This behaves like CharacterIterator::move32(delta, kCurrent). + * + * Behavior for out-of-bounds indexes: + * <code>moveIndex32</code> pins the input index to 0..length(), i.e., + * if the input index<0 then it is pinned to 0; + * if it is index>length() then it is pinned to length(). + * Afterwards, the index is moved by <code>delta</code> code points + * forward or backward, + * but no further backward than to 0 and no further forward than to length(). + * The resulting index return value will be in between 0 and length(), inclusively. + * + * Examples: + * <pre> + * // s has code points 'a' U+10000 'b' U+10ffff U+2029 + * UnicodeString s=UNICODE_STRING("a\\U00010000b\\U0010ffff\\u2029", 31).unescape(); + * + * // initial index: position of U+10000 + * int32_t index=1; + * + * // the following examples will all result in index==4, position of U+10ffff + * + * // skip 2 code points from some position in the string + * index=s.moveIndex32(index, 2); // skips U+10000 and 'b' + * + * // go to the 3rd code point from the start of s (0-based) + * index=s.moveIndex32(0, 3); // skips 'a', U+10000, and 'b' + * + * // go to the next-to-last code point of s + * index=s.moveIndex32(s.length(), -2); // backward-skips U+2029 and U+10ffff + * </pre> + * + * @param index input code unit index + * @param delta (signed) code point count to move the index forward or backward + * in the string + * @return the resulting code unit index + * @stable ICU 2.0 + */ + int32_t moveIndex32(int32_t index, int32_t delta) const; + + /* Substring extraction */ + + /** + * Copy the characters in the range + * [<tt>start</tt>, <tt>start + length</tt>) into the array <tt>dst</tt>, + * beginning at <tt>dstStart</tt>. + * If the string aliases to <code>dst</code> itself as an external buffer, + * then extract() will not copy the contents. + * + * @param start offset of first character which will be copied into the array + * @param length the number of characters to extract + * @param dst array in which to copy characters. The length of <tt>dst</tt> + * must be at least (<tt>dstStart + length</tt>). + * @param dstStart the offset in <TT>dst</TT> where the first character + * will be extracted + * @stable ICU 2.0 + */ + inline void extract(int32_t start, + int32_t length, + Char16Ptr dst, + int32_t dstStart = 0) const; + + /** + * Copy the contents of the string into dest. + * This is a convenience function that + * checks if there is enough space in dest, + * extracts the entire string if possible, + * and NUL-terminates dest if possible. + * + * If the string fits into dest but cannot be NUL-terminated + * (length()==destCapacity) then the error code is set to U_STRING_NOT_TERMINATED_WARNING. + * If the string itself does not fit into dest + * (length()>destCapacity) then the error code is set to U_BUFFER_OVERFLOW_ERROR. + * + * If the string aliases to <code>dest</code> itself as an external buffer, + * then extract() will not copy the contents. + * + * @param dest Destination string buffer. + * @param destCapacity Number of char16_ts available at dest. + * @param errorCode ICU error code. + * @return length() + * @stable ICU 2.0 + */ + int32_t + extract(Char16Ptr dest, int32_t destCapacity, + UErrorCode &errorCode) const; + + /** + * Copy the characters in the range + * [<tt>start</tt>, <tt>start + length</tt>) into the UnicodeString + * <tt>target</tt>. + * @param start offset of first character which will be copied + * @param length the number of characters to extract + * @param target UnicodeString into which to copy characters. + * @return A reference to <TT>target</TT> + * @stable ICU 2.0 + */ + inline void extract(int32_t start, + int32_t length, + UnicodeString& target) const; + + /** + * Copy the characters in the range [<tt>start</tt>, <tt>limit</tt>) + * into the array <tt>dst</tt>, beginning at <tt>dstStart</tt>. + * @param start offset of first character which will be copied into the array + * @param limit offset immediately following the last character to be copied + * @param dst array in which to copy characters. The length of <tt>dst</tt> + * must be at least (<tt>dstStart + (limit - start)</tt>). + * @param dstStart the offset in <TT>dst</TT> where the first character + * will be extracted + * @stable ICU 2.0 + */ + inline void extractBetween(int32_t start, + int32_t limit, + char16_t *dst, + int32_t dstStart = 0) const; + + /** + * Copy the characters in the range [<tt>start</tt>, <tt>limit</tt>) + * into the UnicodeString <tt>target</tt>. Replaceable API. + * @param start offset of first character which will be copied + * @param limit offset immediately following the last character to be copied + * @param target UnicodeString into which to copy characters. + * @return A reference to <TT>target</TT> + * @stable ICU 2.0 + */ + virtual void extractBetween(int32_t start, + int32_t limit, + UnicodeString& target) const; + + /** + * Copy the characters in the range + * [<tt>start</TT>, <tt>start + startLength</TT>) into an array of characters. + * All characters must be invariant (see utypes.h). + * Use US_INV as the last, signature-distinguishing parameter. + * + * This function does not write any more than <code>targetCapacity</code> + * characters but returns the length of the entire output string + * so that one can allocate a larger buffer and call the function again + * if necessary. + * The output string is NUL-terminated if possible. + * + * @param start offset of first character which will be copied + * @param startLength the number of characters to extract + * @param target the target buffer for extraction, can be NULL + * if targetLength is 0 + * @param targetCapacity the length of the target buffer + * @param inv Signature-distinguishing paramater, use US_INV. + * @return the output string length, not including the terminating NUL + * @stable ICU 3.2 + */ + int32_t extract(int32_t start, + int32_t startLength, + char *target, + int32_t targetCapacity, + enum EInvariant inv) const; + +#if U_CHARSET_IS_UTF8 || !UCONFIG_NO_CONVERSION + + /** + * Copy the characters in the range + * [<tt>start</TT>, <tt>start + length</TT>) into an array of characters + * in the platform's default codepage. + * This function does not write any more than <code>targetLength</code> + * characters but returns the length of the entire output string + * so that one can allocate a larger buffer and call the function again + * if necessary. + * The output string is NUL-terminated if possible. + * + * @param start offset of first character which will be copied + * @param startLength the number of characters to extract + * @param target the target buffer for extraction + * @param targetLength the length of the target buffer + * If <TT>target</TT> is NULL, then the number of bytes required for + * <TT>target</TT> is returned. + * @return the output string length, not including the terminating NUL + * @stable ICU 2.0 + */ + int32_t extract(int32_t start, + int32_t startLength, + char *target, + uint32_t targetLength) const; + +#endif + +#if !UCONFIG_NO_CONVERSION + + /** + * Copy the characters in the range + * [<tt>start</TT>, <tt>start + length</TT>) into an array of characters + * in a specified codepage. + * The output string is NUL-terminated. + * + * Recommendation: For invariant-character strings use + * extract(int32_t start, int32_t length, char *target, int32_t targetCapacity, enum EInvariant inv) const + * because it avoids object code dependencies of UnicodeString on + * the conversion code. + * + * @param start offset of first character which will be copied + * @param startLength the number of characters to extract + * @param target the target buffer for extraction + * @param codepage the desired codepage for the characters. 0 has + * the special meaning of the default codepage + * If <code>codepage</code> is an empty string (<code>""</code>), + * then a simple conversion is performed on the codepage-invariant + * subset ("invariant characters") of the platform encoding. See utypes.h. + * If <TT>target</TT> is NULL, then the number of bytes required for + * <TT>target</TT> is returned. It is assumed that the target is big enough + * to fit all of the characters. + * @return the output string length, not including the terminating NUL + * @stable ICU 2.0 + */ + inline int32_t extract(int32_t start, + int32_t startLength, + char *target, + const char *codepage = 0) const; + + /** + * Copy the characters in the range + * [<tt>start</TT>, <tt>start + length</TT>) into an array of characters + * in a specified codepage. + * This function does not write any more than <code>targetLength</code> + * characters but returns the length of the entire output string + * so that one can allocate a larger buffer and call the function again + * if necessary. + * The output string is NUL-terminated if possible. + * + * Recommendation: For invariant-character strings use + * extract(int32_t start, int32_t length, char *target, int32_t targetCapacity, enum EInvariant inv) const + * because it avoids object code dependencies of UnicodeString on + * the conversion code. + * + * @param start offset of first character which will be copied + * @param startLength the number of characters to extract + * @param target the target buffer for extraction + * @param targetLength the length of the target buffer + * @param codepage the desired codepage for the characters. 0 has + * the special meaning of the default codepage + * If <code>codepage</code> is an empty string (<code>""</code>), + * then a simple conversion is performed on the codepage-invariant + * subset ("invariant characters") of the platform encoding. See utypes.h. + * If <TT>target</TT> is NULL, then the number of bytes required for + * <TT>target</TT> is returned. + * @return the output string length, not including the terminating NUL + * @stable ICU 2.0 + */ + int32_t extract(int32_t start, + int32_t startLength, + char *target, + uint32_t targetLength, + const char *codepage) const; + + /** + * Convert the UnicodeString into a codepage string using an existing UConverter. + * The output string is NUL-terminated if possible. + * + * This function avoids the overhead of opening and closing a converter if + * multiple strings are extracted. + * + * @param dest destination string buffer, can be NULL if destCapacity==0 + * @param destCapacity the number of chars available at dest + * @param cnv the converter object to be used (ucnv_resetFromUnicode() will be called), + * or NULL for the default converter + * @param errorCode normal ICU error code + * @return the length of the output string, not counting the terminating NUL; + * if the length is greater than destCapacity, then the string will not fit + * and a buffer of the indicated length would need to be passed in + * @stable ICU 2.0 + */ + int32_t extract(char *dest, int32_t destCapacity, + UConverter *cnv, + UErrorCode &errorCode) const; + +#endif + + /** + * Create a temporary substring for the specified range. + * Unlike the substring constructor and setTo() functions, + * the object returned here will be a read-only alias (using getBuffer()) + * rather than copying the text. + * As a result, this substring operation is much faster but requires + * that the original string not be modified or deleted during the lifetime + * of the returned substring object. + * @param start offset of the first character visible in the substring + * @param length length of the substring + * @return a read-only alias UnicodeString object for the substring + * @stable ICU 4.4 + */ + UnicodeString tempSubString(int32_t start=0, int32_t length=INT32_MAX) const; + + /** + * Create a temporary substring for the specified range. + * Same as tempSubString(start, length) except that the substring range + * is specified as a (start, limit) pair (with an exclusive limit index) + * rather than a (start, length) pair. + * @param start offset of the first character visible in the substring + * @param limit offset immediately following the last character visible in the substring + * @return a read-only alias UnicodeString object for the substring + * @stable ICU 4.4 + */ + inline UnicodeString tempSubStringBetween(int32_t start, int32_t limit=INT32_MAX) const; + + /** + * Convert the UnicodeString to UTF-8 and write the result + * to a ByteSink. This is called by toUTF8String(). + * Unpaired surrogates are replaced with U+FFFD. + * Calls u_strToUTF8WithSub(). + * + * @param sink A ByteSink to which the UTF-8 version of the string is written. + * sink.Flush() is called at the end. + * @stable ICU 4.2 + * @see toUTF8String + */ + void toUTF8(ByteSink &sink) const; + + /** + * Convert the UnicodeString to UTF-8 and append the result + * to a standard string. + * Unpaired surrogates are replaced with U+FFFD. + * Calls toUTF8(). + * + * @param result A standard string (or a compatible object) + * to which the UTF-8 version of the string is appended. + * @return The string object. + * @stable ICU 4.2 + * @see toUTF8 + */ + template<typename StringClass> + StringClass &toUTF8String(StringClass &result) const { + StringByteSink<StringClass> sbs(&result, length()); + toUTF8(sbs); + return result; + } + + /** + * Convert the UnicodeString to UTF-32. + * Unpaired surrogates are replaced with U+FFFD. + * Calls u_strToUTF32WithSub(). + * + * @param utf32 destination string buffer, can be NULL if capacity==0 + * @param capacity the number of UChar32s available at utf32 + * @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 The length of the UTF-32 string. + * @see fromUTF32 + * @stable ICU 4.2 + */ + int32_t toUTF32(UChar32 *utf32, int32_t capacity, UErrorCode &errorCode) const; + + /* Length operations */ + + /** + * Return the length of the UnicodeString object. + * The length is the number of char16_t code units are in the UnicodeString. + * If you want the number of code points, please use countChar32(). + * @return the length of the UnicodeString object + * @see countChar32 + * @stable ICU 2.0 + */ + inline int32_t length(void) const; + + /** + * Count Unicode code points in the length char16_t code units of the string. + * A code point may occupy either one or two char16_t code units. + * Counting code points involves reading all code units. + * + * This functions is basically the inverse of moveIndex32(). + * + * @param start the index of the first code unit to check + * @param length the number of char16_t code units to check + * @return the number of code points in the specified code units + * @see length + * @stable ICU 2.0 + */ + int32_t + countChar32(int32_t start=0, int32_t length=INT32_MAX) const; + + /** + * Check if the length char16_t code units of the string + * contain more Unicode code points than a certain number. + * This is more efficient than counting all code points in this part of the string + * and comparing that number with a threshold. + * This function may not need to scan the string at all if the length + * falls within a certain range, and + * never needs to count more than 'number+1' code points. + * Logically equivalent to (countChar32(start, length)>number). + * A Unicode code point may occupy either one or two char16_t code units. + * + * @param start the index of the first code unit to check (0 for the entire string) + * @param length the number of char16_t code units to check + * (use INT32_MAX for the entire string; remember that start/length + * values are pinned) + * @param number The number of code points in the (sub)string is compared against + * the 'number' parameter. + * @return Boolean value for whether the string contains more Unicode code points + * than 'number'. Same as (u_countChar32(s, length)>number). + * @see countChar32 + * @see u_strHasMoreChar32Than + * @stable ICU 2.4 + */ + UBool + hasMoreChar32Than(int32_t start, int32_t length, int32_t number) const; + + /** + * Determine if this string is empty. + * @return TRUE if this string contains 0 characters, FALSE otherwise. + * @stable ICU 2.0 + */ + inline UBool isEmpty(void) const; + + /** + * Return the capacity of the internal buffer of the UnicodeString object. + * This is useful together with the getBuffer functions. + * See there for details. + * + * @return the number of char16_ts available in the internal buffer + * @see getBuffer + * @stable ICU 2.0 + */ + inline int32_t getCapacity(void) const; + + /* Other operations */ + + /** + * Generate a hash code for this object. + * @return The hash code of this UnicodeString. + * @stable ICU 2.0 + */ + inline int32_t hashCode(void) const; + + /** + * Determine if this object contains a valid string. + * A bogus string has no value. It is different from an empty string, + * although in both cases isEmpty() returns TRUE and length() returns 0. + * setToBogus() and isBogus() can be used to indicate that no string value is available. + * For a bogus string, getBuffer() and getTerminatedBuffer() return NULL, and + * length() returns 0. + * + * @return TRUE if the string is bogus/invalid, FALSE otherwise + * @see setToBogus() + * @stable ICU 2.0 + */ + inline UBool isBogus(void) const; + + + //======================================== + // Write operations + //======================================== + + /* Assignment operations */ + + /** + * Assignment operator. Replace the characters in this UnicodeString + * with the characters from <TT>srcText</TT>. + * + * Starting with ICU 2.4, the assignment operator and the copy constructor + * allocate a new buffer and copy the buffer contents even for readonly aliases. + * By contrast, the fastCopyFrom() function implements the old, + * more efficient but less safe behavior + * of making this string also a readonly alias to the same buffer. + * + * If the source object has an "open" buffer from getBuffer(minCapacity), + * then the copy is an empty string. + * + * @param srcText The text containing the characters to replace + * @return a reference to this + * @stable ICU 2.0 + * @see fastCopyFrom + */ + UnicodeString &operator=(const UnicodeString &srcText); + + /** + * Almost the same as the assignment operator. + * Replace the characters in this UnicodeString + * with the characters from <code>srcText</code>. + * + * This function works the same as the assignment operator + * for all strings except for ones that are readonly aliases. + * + * Starting with ICU 2.4, the assignment operator and the copy constructor + * allocate a new buffer and copy the buffer contents even for readonly aliases. + * This function implements the old, more efficient but less safe behavior + * of making this string also a readonly alias to the same buffer. + * + * The fastCopyFrom function must be used only if it is known that the lifetime of + * this UnicodeString does not exceed the lifetime of the aliased buffer + * including its contents, for example for strings from resource bundles + * or aliases to string constants. + * + * If the source object has an "open" buffer from getBuffer(minCapacity), + * then the copy is an empty string. + * + * @param src The text containing the characters to replace. + * @return a reference to this + * @stable ICU 2.4 + */ + UnicodeString &fastCopyFrom(const UnicodeString &src); + + /** + * Move assignment operator, might leave src in bogus state. + * This string will have the same contents and state that the source string had. + * The behavior is undefined if *this and src are the same object. + * @param src source string + * @return *this + * @stable ICU 56 + */ + UnicodeString &operator=(UnicodeString &&src) U_NOEXCEPT { + return moveFrom(src); + } + + // do not use #ifndef U_HIDE_DRAFT_API for moveFrom, needed by non-draft API + /** + * Move assignment, might leave src in bogus state. + * This string will have the same contents and state that the source string had. + * The behavior is undefined if *this and src are the same object. + * + * Can be called explicitly, does not need C++11 support. + * @param src source string + * @return *this + * @draft ICU 56 + */ + UnicodeString &moveFrom(UnicodeString &src) U_NOEXCEPT; + + /** + * Swap strings. + * @param other other string + * @stable ICU 56 + */ + void swap(UnicodeString &other) U_NOEXCEPT; + + /** + * Non-member UnicodeString swap function. + * @param s1 will get s2's contents and state + * @param s2 will get s1's contents and state + * @stable ICU 56 + */ + friend U_COMMON_API inline void U_EXPORT2 + swap(UnicodeString &s1, UnicodeString &s2) U_NOEXCEPT { + s1.swap(s2); + } + + /** + * Assignment operator. Replace the characters in this UnicodeString + * with the code unit <TT>ch</TT>. + * @param ch the code unit to replace + * @return a reference to this + * @stable ICU 2.0 + */ + inline UnicodeString& operator= (char16_t ch); + + /** + * Assignment operator. Replace the characters in this UnicodeString + * with the code point <TT>ch</TT>. + * @param ch the code point to replace + * @return a reference to this + * @stable ICU 2.0 + */ + inline UnicodeString& operator= (UChar32 ch); + + /** + * Set the text in the UnicodeString object to the characters + * in <TT>srcText</TT> in the range + * [<TT>srcStart</TT>, <TT>srcText.length()</TT>). + * <TT>srcText</TT> is not modified. + * @param srcText the source for the new characters + * @param srcStart the offset into <TT>srcText</TT> where new characters + * will be obtained + * @return a reference to this + * @stable ICU 2.2 + */ + inline UnicodeString& setTo(const UnicodeString& srcText, + int32_t srcStart); + + /** + * Set the text in the UnicodeString object to the characters + * in <TT>srcText</TT> in the range + * [<TT>srcStart</TT>, <TT>srcStart + srcLength</TT>). + * <TT>srcText</TT> is not modified. + * @param srcText the source for the new characters + * @param srcStart the offset into <TT>srcText</TT> where new characters + * will be obtained + * @param srcLength the number of characters in <TT>srcText</TT> in the + * replace string. + * @return a reference to this + * @stable ICU 2.0 + */ + inline UnicodeString& setTo(const UnicodeString& srcText, + int32_t srcStart, + int32_t srcLength); + + /** + * Set the text in the UnicodeString object to the characters in + * <TT>srcText</TT>. + * <TT>srcText</TT> is not modified. + * @param srcText the source for the new characters + * @return a reference to this + * @stable ICU 2.0 + */ + inline UnicodeString& setTo(const UnicodeString& srcText); + + /** + * Set the characters in the UnicodeString object to the characters + * in <TT>srcChars</TT>. <TT>srcChars</TT> is not modified. + * @param srcChars the source for the new characters + * @param srcLength the number of Unicode characters in srcChars. + * @return a reference to this + * @stable ICU 2.0 + */ + inline UnicodeString& setTo(const char16_t *srcChars, + int32_t srcLength); + + /** + * Set the characters in the UnicodeString object to the code unit + * <TT>srcChar</TT>. + * @param srcChar the code unit which becomes the UnicodeString's character + * content + * @return a reference to this + * @stable ICU 2.0 + */ + UnicodeString& setTo(char16_t srcChar); + + /** + * Set the characters in the UnicodeString object to the code point + * <TT>srcChar</TT>. + * @param srcChar the code point which becomes the UnicodeString's character + * content + * @return a reference to this + * @stable ICU 2.0 + */ + UnicodeString& setTo(UChar32 srcChar); + + /** + * Aliasing setTo() function, analogous to the readonly-aliasing char16_t* constructor. + * The text will be used for the UnicodeString object, but + * it will not be released when the UnicodeString is destroyed. + * This has copy-on-write semantics: + * When the string is modified, then the buffer is first copied into + * newly allocated memory. + * The aliased buffer is never modified. + * + * In an assignment to another UnicodeString, when using the copy constructor + * or the assignment operator, the text will be copied. + * When using fastCopyFrom(), the text will be aliased again, + * so that both strings then alias the same readonly-text. + * + * @param isTerminated specifies if <code>text</code> is <code>NUL</code>-terminated. + * This must be true if <code>textLength==-1</code>. + * @param text The characters to alias for the UnicodeString. + * @param textLength The number of Unicode characters in <code>text</code> to alias. + * If -1, then this constructor will determine the length + * by calling <code>u_strlen()</code>. + * @return a reference to this + * @stable ICU 2.0 + */ + UnicodeString &setTo(UBool isTerminated, + ConstChar16Ptr text, + int32_t textLength); + + /** + * Aliasing setTo() function, analogous to the writable-aliasing char16_t* constructor. + * The text will be used for the UnicodeString object, but + * it will not be released when the UnicodeString is destroyed. + * This has write-through semantics: + * For as long as the capacity of the buffer is sufficient, write operations + * will directly affect the buffer. When more capacity is necessary, then + * a new buffer will be allocated and the contents copied as with regularly + * constructed strings. + * In an assignment to another UnicodeString, the buffer will be copied. + * The extract(Char16Ptr dst) function detects whether the dst pointer is the same + * as the string buffer itself and will in this case not copy the contents. + * + * @param buffer The characters to alias for the UnicodeString. + * @param buffLength The number of Unicode characters in <code>buffer</code> to alias. + * @param buffCapacity The size of <code>buffer</code> in char16_ts. + * @return a reference to this + * @stable ICU 2.0 + */ + UnicodeString &setTo(char16_t *buffer, + int32_t buffLength, + int32_t buffCapacity); + + /** + * Make this UnicodeString object invalid. + * The string will test TRUE with isBogus(). + * + * A bogus string has no value. It is different from an empty string. + * It can be used to indicate that no string value is available. + * getBuffer() and getTerminatedBuffer() return NULL, and + * length() returns 0. + * + * This utility function is used throughout the UnicodeString + * implementation to indicate that a UnicodeString operation failed, + * and may be used in other functions, + * especially but not exclusively when such functions do not + * take a UErrorCode for simplicity. + * + * The following methods, and no others, will clear a string object's bogus flag: + * - remove() + * - remove(0, INT32_MAX) + * - truncate(0) + * - operator=() (assignment operator) + * - setTo(...) + * + * The simplest ways to turn a bogus string into an empty one + * is to use the remove() function. + * Examples for other functions that are equivalent to "set to empty string": + * \code + * if(s.isBogus()) { + * s.remove(); // set to an empty string (remove all), or + * s.remove(0, INT32_MAX); // set to an empty string (remove all), or + * s.truncate(0); // set to an empty string (complete truncation), or + * s=UnicodeString(); // assign an empty string, or + * s.setTo((UChar32)-1); // set to a pseudo code point that is out of range, or + * static const char16_t nul=0; + * s.setTo(&nul, 0); // set to an empty C Unicode string + * } + * \endcode + * + * @see isBogus() + * @stable ICU 2.0 + */ + void setToBogus(); + + /** + * Set the character at the specified offset to the specified character. + * @param offset A valid offset into the text of the character to set + * @param ch The new character + * @return A reference to this + * @stable ICU 2.0 + */ + UnicodeString& setCharAt(int32_t offset, + char16_t ch); + + + /* Append operations */ + + /** + * Append operator. Append the code unit <TT>ch</TT> to the UnicodeString + * object. + * @param ch the code unit to be appended + * @return a reference to this + * @stable ICU 2.0 + */ + inline UnicodeString& operator+= (char16_t ch); + + /** + * Append operator. Append the code point <TT>ch</TT> to the UnicodeString + * object. + * @param ch the code point to be appended + * @return a reference to this + * @stable ICU 2.0 + */ + inline UnicodeString& operator+= (UChar32 ch); + + /** + * Append operator. Append the characters in <TT>srcText</TT> to the + * UnicodeString object. <TT>srcText</TT> is not modified. + * @param srcText the source for the new characters + * @return a reference to this + * @stable ICU 2.0 + */ + inline UnicodeString& operator+= (const UnicodeString& srcText); + + /** + * Append the characters + * in <TT>srcText</TT> in the range + * [<TT>srcStart</TT>, <TT>srcStart + srcLength</TT>) to the + * UnicodeString object at offset <TT>start</TT>. <TT>srcText</TT> + * is not modified. + * @param srcText the source for the new characters + * @param srcStart the offset into <TT>srcText</TT> where new characters + * will be obtained + * @param srcLength the number of characters in <TT>srcText</TT> in + * the append string + * @return a reference to this + * @stable ICU 2.0 + */ + inline UnicodeString& append(const UnicodeString& srcText, + int32_t srcStart, + int32_t srcLength); + + /** + * Append the characters in <TT>srcText</TT> to the UnicodeString object. + * <TT>srcText</TT> is not modified. + * @param srcText the source for the new characters + * @return a reference to this + * @stable ICU 2.0 + */ + inline UnicodeString& append(const UnicodeString& srcText); + + /** + * Append the characters in <TT>srcChars</TT> in the range + * [<TT>srcStart</TT>, <TT>srcStart + srcLength</TT>) to the UnicodeString + * object at offset + * <TT>start</TT>. <TT>srcChars</TT> is not modified. + * @param srcChars the source for the new characters + * @param srcStart the offset into <TT>srcChars</TT> where new characters + * will be obtained + * @param srcLength the number of characters in <TT>srcChars</TT> in + * the append string; can be -1 if <TT>srcChars</TT> is NUL-terminated + * @return a reference to this + * @stable ICU 2.0 + */ + inline UnicodeString& append(const char16_t *srcChars, + int32_t srcStart, + int32_t srcLength); + + /** + * Append the characters in <TT>srcChars</TT> to the UnicodeString object + * at offset <TT>start</TT>. <TT>srcChars</TT> is not modified. + * @param srcChars the source for the new characters + * @param srcLength the number of Unicode characters in <TT>srcChars</TT>; + * can be -1 if <TT>srcChars</TT> is NUL-terminated + * @return a reference to this + * @stable ICU 2.0 + */ + inline UnicodeString& append(ConstChar16Ptr srcChars, + int32_t srcLength); + + /** + * Append the code unit <TT>srcChar</TT> to the UnicodeString object. + * @param srcChar the code unit to append + * @return a reference to this + * @stable ICU 2.0 + */ + inline UnicodeString& append(char16_t srcChar); + + /** + * Append the code point <TT>srcChar</TT> to the UnicodeString object. + * @param srcChar the code point to append + * @return a reference to this + * @stable ICU 2.0 + */ + UnicodeString& append(UChar32 srcChar); + + + /* Insert operations */ + + /** + * Insert the characters in <TT>srcText</TT> in the range + * [<TT>srcStart</TT>, <TT>srcStart + srcLength</TT>) into the UnicodeString + * object at offset <TT>start</TT>. <TT>srcText</TT> is not modified. + * @param start the offset where the insertion begins + * @param srcText the source for the new characters + * @param srcStart the offset into <TT>srcText</TT> where new characters + * will be obtained + * @param srcLength the number of characters in <TT>srcText</TT> in + * the insert string + * @return a reference to this + * @stable ICU 2.0 + */ + inline UnicodeString& insert(int32_t start, + const UnicodeString& srcText, + int32_t srcStart, + int32_t srcLength); + + /** + * Insert the characters in <TT>srcText</TT> into the UnicodeString object + * at offset <TT>start</TT>. <TT>srcText</TT> is not modified. + * @param start the offset where the insertion begins + * @param srcText the source for the new characters + * @return a reference to this + * @stable ICU 2.0 + */ + inline UnicodeString& insert(int32_t start, + const UnicodeString& srcText); + + /** + * Insert the characters in <TT>srcChars</TT> in the range + * [<TT>srcStart</TT>, <TT>srcStart + srcLength</TT>) into the UnicodeString + * object at offset <TT>start</TT>. <TT>srcChars</TT> is not modified. + * @param start the offset at which the insertion begins + * @param srcChars the source for the new characters + * @param srcStart the offset into <TT>srcChars</TT> where new characters + * will be obtained + * @param srcLength the number of characters in <TT>srcChars</TT> + * in the insert string + * @return a reference to this + * @stable ICU 2.0 + */ + inline UnicodeString& insert(int32_t start, + const char16_t *srcChars, + int32_t srcStart, + int32_t srcLength); + + /** + * Insert the characters in <TT>srcChars</TT> into the UnicodeString object + * at offset <TT>start</TT>. <TT>srcChars</TT> is not modified. + * @param start the offset where the insertion begins + * @param srcChars the source for the new characters + * @param srcLength the number of Unicode characters in srcChars. + * @return a reference to this + * @stable ICU 2.0 + */ + inline UnicodeString& insert(int32_t start, + ConstChar16Ptr srcChars, + int32_t srcLength); + + /** + * Insert the code unit <TT>srcChar</TT> into the UnicodeString object at + * offset <TT>start</TT>. + * @param start the offset at which the insertion occurs + * @param srcChar the code unit to insert + * @return a reference to this + * @stable ICU 2.0 + */ + inline UnicodeString& insert(int32_t start, + char16_t srcChar); + + /** + * Insert the code point <TT>srcChar</TT> into the UnicodeString object at + * offset <TT>start</TT>. + * @param start the offset at which the insertion occurs + * @param srcChar the code point to insert + * @return a reference to this + * @stable ICU 2.0 + */ + inline UnicodeString& insert(int32_t start, + UChar32 srcChar); + + + /* Replace operations */ + + /** + * Replace the characters in the range + * [<TT>start</TT>, <TT>start + length</TT>) with the characters in + * <TT>srcText</TT> in the range + * [<TT>srcStart</TT>, <TT>srcStart + srcLength</TT>). + * <TT>srcText</TT> is not modified. + * @param start the offset at which the replace operation begins + * @param length the number of characters to replace. The character at + * <TT>start + length</TT> is not modified. + * @param srcText the source for the new characters + * @param srcStart the offset into <TT>srcText</TT> where new characters + * will be obtained + * @param srcLength the number of characters in <TT>srcText</TT> in + * the replace string + * @return a reference to this + * @stable ICU 2.0 + */ + UnicodeString& replace(int32_t start, + int32_t length, + const UnicodeString& srcText, + int32_t srcStart, + int32_t srcLength); + + /** + * Replace the characters in the range + * [<TT>start</TT>, <TT>start + length</TT>) + * with the characters in <TT>srcText</TT>. <TT>srcText</TT> is + * not modified. + * @param start the offset at which the replace operation begins + * @param length the number of characters to replace. The character at + * <TT>start + length</TT> is not modified. + * @param srcText the source for the new characters + * @return a reference to this + * @stable ICU 2.0 + */ + UnicodeString& replace(int32_t start, + int32_t length, + const UnicodeString& srcText); + + /** + * Replace the characters in the range + * [<TT>start</TT>, <TT>start + length</TT>) with the characters in + * <TT>srcChars</TT> in the range + * [<TT>srcStart</TT>, <TT>srcStart + srcLength</TT>). <TT>srcChars</TT> + * is not modified. + * @param start the offset at which the replace operation begins + * @param length the number of characters to replace. The character at + * <TT>start + length</TT> is not modified. + * @param srcChars the source for the new characters + * @param srcStart the offset into <TT>srcChars</TT> where new characters + * will be obtained + * @param srcLength the number of characters in <TT>srcChars</TT> + * in the replace string + * @return a reference to this + * @stable ICU 2.0 + */ + UnicodeString& replace(int32_t start, + int32_t length, + const char16_t *srcChars, + int32_t srcStart, + int32_t srcLength); + + /** + * Replace the characters in the range + * [<TT>start</TT>, <TT>start + length</TT>) with the characters in + * <TT>srcChars</TT>. <TT>srcChars</TT> is not modified. + * @param start the offset at which the replace operation begins + * @param length number of characters to replace. The character at + * <TT>start + length</TT> is not modified. + * @param srcChars the source for the new characters + * @param srcLength the number of Unicode characters in srcChars + * @return a reference to this + * @stable ICU 2.0 + */ + inline UnicodeString& replace(int32_t start, + int32_t length, + ConstChar16Ptr srcChars, + int32_t srcLength); + + /** + * Replace the characters in the range + * [<TT>start</TT>, <TT>start + length</TT>) with the code unit + * <TT>srcChar</TT>. + * @param start the offset at which the replace operation begins + * @param length the number of characters to replace. The character at + * <TT>start + length</TT> is not modified. + * @param srcChar the new code unit + * @return a reference to this + * @stable ICU 2.0 + */ + inline UnicodeString& replace(int32_t start, + int32_t length, + char16_t srcChar); + + /** + * Replace the characters in the range + * [<TT>start</TT>, <TT>start + length</TT>) with the code point + * <TT>srcChar</TT>. + * @param start the offset at which the replace operation begins + * @param length the number of characters to replace. The character at + * <TT>start + length</TT> is not modified. + * @param srcChar the new code point + * @return a reference to this + * @stable ICU 2.0 + */ + UnicodeString& replace(int32_t start, int32_t length, UChar32 srcChar); + + /** + * Replace the characters in the range [<TT>start</TT>, <TT>limit</TT>) + * with the characters in <TT>srcText</TT>. <TT>srcText</TT> is not modified. + * @param start the offset at which the replace operation begins + * @param limit the offset immediately following the replace range + * @param srcText the source for the new characters + * @return a reference to this + * @stable ICU 2.0 + */ + inline UnicodeString& replaceBetween(int32_t start, + int32_t limit, + const UnicodeString& srcText); + + /** + * Replace the characters in the range [<TT>start</TT>, <TT>limit</TT>) + * with the characters in <TT>srcText</TT> in the range + * [<TT>srcStart</TT>, <TT>srcLimit</TT>). <TT>srcText</TT> is not modified. + * @param start the offset at which the replace operation begins + * @param limit the offset immediately following the replace range + * @param srcText the source for the new characters + * @param srcStart the offset into <TT>srcChars</TT> where new characters + * will be obtained + * @param srcLimit the offset immediately following the range to copy + * in <TT>srcText</TT> + * @return a reference to this + * @stable ICU 2.0 + */ + inline UnicodeString& replaceBetween(int32_t start, + int32_t limit, + const UnicodeString& srcText, + int32_t srcStart, + int32_t srcLimit); + + /** + * Replace a substring of this object with the given text. + * @param start the beginning index, inclusive; <code>0 <= start + * <= limit</code>. + * @param limit the ending index, exclusive; <code>start <= limit + * <= length()</code>. + * @param text the text to replace characters <code>start</code> + * to <code>limit - 1</code> + * @stable ICU 2.0 + */ + virtual void handleReplaceBetween(int32_t start, + int32_t limit, + const UnicodeString& text); + + /** + * Replaceable API + * @return TRUE if it has MetaData + * @stable ICU 2.4 + */ + virtual UBool hasMetaData() const; + + /** + * Copy a substring of this object, retaining attribute (out-of-band) + * information. This method is used to duplicate or reorder substrings. + * The destination index must not overlap the source range. + * + * @param start the beginning index, inclusive; <code>0 <= start <= + * limit</code>. + * @param limit the ending index, exclusive; <code>start <= limit <= + * length()</code>. + * @param dest the destination index. The characters from + * <code>start..limit-1</code> will be copied to <code>dest</code>. + * Implementations of this method may assume that <code>dest <= start || + * dest >= limit</code>. + * @stable ICU 2.0 + */ + virtual void copy(int32_t start, int32_t limit, int32_t dest); + + /* Search and replace operations */ + + /** + * Replace all occurrences of characters in oldText with the characters + * in newText + * @param oldText the text containing the search text + * @param newText the text containing the replacement text + * @return a reference to this + * @stable ICU 2.0 + */ + inline UnicodeString& findAndReplace(const UnicodeString& oldText, + const UnicodeString& newText); + + /** + * Replace all occurrences of characters in oldText with characters + * in newText + * in the range [<TT>start</TT>, <TT>start + length</TT>). + * @param start the start of the range in which replace will performed + * @param length the length of the range in which replace will be performed + * @param oldText the text containing the search text + * @param newText the text containing the replacement text + * @return a reference to this + * @stable ICU 2.0 + */ + inline UnicodeString& findAndReplace(int32_t start, + int32_t length, + const UnicodeString& oldText, + const UnicodeString& newText); + + /** + * Replace all occurrences of characters in oldText in the range + * [<TT>oldStart</TT>, <TT>oldStart + oldLength</TT>) with the characters + * in newText in the range + * [<TT>newStart</TT>, <TT>newStart + newLength</TT>) + * in the range [<TT>start</TT>, <TT>start + length</TT>). + * @param start the start of the range in which replace will performed + * @param length the length of the range in which replace will be performed + * @param oldText the text containing the search text + * @param oldStart the start of the search range in <TT>oldText</TT> + * @param oldLength the length of the search range in <TT>oldText</TT> + * @param newText the text containing the replacement text + * @param newStart the start of the replacement range in <TT>newText</TT> + * @param newLength the length of the replacement range in <TT>newText</TT> + * @return a reference to this + * @stable ICU 2.0 + */ + UnicodeString& findAndReplace(int32_t start, + int32_t length, + const UnicodeString& oldText, + int32_t oldStart, + int32_t oldLength, + const UnicodeString& newText, + int32_t newStart, + int32_t newLength); + + + /* Remove operations */ + + /** + * Remove all characters from the UnicodeString object. + * @return a reference to this + * @stable ICU 2.0 + */ + inline UnicodeString& remove(void); + + /** + * Remove the characters in the range + * [<TT>start</TT>, <TT>start + length</TT>) from the UnicodeString object. + * @param start the offset of the first character to remove + * @param length the number of characters to remove + * @return a reference to this + * @stable ICU 2.0 + */ + inline UnicodeString& remove(int32_t start, + int32_t length = (int32_t)INT32_MAX); + + /** + * Remove the characters in the range + * [<TT>start</TT>, <TT>limit</TT>) from the UnicodeString object. + * @param start the offset of the first character to remove + * @param limit the offset immediately following the range to remove + * @return a reference to this + * @stable ICU 2.0 + */ + inline UnicodeString& removeBetween(int32_t start, + int32_t limit = (int32_t)INT32_MAX); + + /** + * Retain only the characters in the range + * [<code>start</code>, <code>limit</code>) from the UnicodeString object. + * Removes characters before <code>start</code> and at and after <code>limit</code>. + * @param start the offset of the first character to retain + * @param limit the offset immediately following the range to retain + * @return a reference to this + * @stable ICU 4.4 + */ + inline UnicodeString &retainBetween(int32_t start, int32_t limit = INT32_MAX); + + /* Length operations */ + + /** + * Pad the start of this UnicodeString with the character <TT>padChar</TT>. + * If the length of this UnicodeString is less than targetLength, + * length() - targetLength copies of padChar will be added to the + * beginning of this UnicodeString. + * @param targetLength the desired length of the string + * @param padChar the character to use for padding. Defaults to + * space (U+0020) + * @return TRUE if the text was padded, FALSE otherwise. + * @stable ICU 2.0 + */ + UBool padLeading(int32_t targetLength, + char16_t padChar = 0x0020); + + /** + * Pad the end of this UnicodeString with the character <TT>padChar</TT>. + * If the length of this UnicodeString is less than targetLength, + * length() - targetLength copies of padChar will be added to the + * end of this UnicodeString. + * @param targetLength the desired length of the string + * @param padChar the character to use for padding. Defaults to + * space (U+0020) + * @return TRUE if the text was padded, FALSE otherwise. + * @stable ICU 2.0 + */ + UBool padTrailing(int32_t targetLength, + char16_t padChar = 0x0020); + + /** + * Truncate this UnicodeString to the <TT>targetLength</TT>. + * @param targetLength the desired length of this UnicodeString. + * @return TRUE if the text was truncated, FALSE otherwise + * @stable ICU 2.0 + */ + inline UBool truncate(int32_t targetLength); + + /** + * Trims leading and trailing whitespace from this UnicodeString. + * @return a reference to this + * @stable ICU 2.0 + */ + UnicodeString& trim(void); + + + /* Miscellaneous operations */ + + /** + * Reverse this UnicodeString in place. + * @return a reference to this + * @stable ICU 2.0 + */ + inline UnicodeString& reverse(void); + + /** + * Reverse the range [<TT>start</TT>, <TT>start + length</TT>) in + * this UnicodeString. + * @param start the start of the range to reverse + * @param length the number of characters to to reverse + * @return a reference to this + * @stable ICU 2.0 + */ + inline UnicodeString& reverse(int32_t start, + int32_t length); + + /** + * Convert the characters in this to UPPER CASE following the conventions of + * the default locale. + * @return A reference to this. + * @stable ICU 2.0 + */ + UnicodeString& toUpper(void); + + /** + * Convert the characters in this to UPPER CASE following the conventions of + * a specific locale. + * @param locale The locale containing the conventions to use. + * @return A reference to this. + * @stable ICU 2.0 + */ + UnicodeString& toUpper(const Locale& locale); + + /** + * Convert the characters in this to lower case following the conventions of + * the default locale. + * @return A reference to this. + * @stable ICU 2.0 + */ + UnicodeString& toLower(void); + + /** + * Convert the characters in this to lower case following the conventions of + * a specific locale. + * @param locale The locale containing the conventions to use. + * @return A reference to this. + * @stable ICU 2.0 + */ + UnicodeString& toLower(const Locale& locale); + +#if !UCONFIG_NO_BREAK_ITERATION + + /** + * Titlecase this string, convenience function using the default locale. + * + * Casing is locale-dependent and context-sensitive. + * Titlecasing uses a break iterator to find the first characters of words + * that are to be titlecased. It titlecases those characters and lowercases + * all others. + * + * The titlecase break iterator can be provided to customize for arbitrary + * styles, using rules and dictionaries beyond the standard iterators. + * It may be more efficient to always provide an iterator to avoid + * opening and closing one for each string. + * The standard titlecase iterator for the root locale implements the + * algorithm of Unicode TR 21. + * + * This function uses only the setText(), first() and next() methods of the + * provided break iterator. + * + * @param titleIter A break iterator to find the first characters of words + * that are to be titlecased. + * If none is provided (0), then a standard titlecase + * break iterator is opened. + * Otherwise the provided iterator is set to the string's text. + * @return A reference to this. + * @stable ICU 2.1 + */ + UnicodeString &toTitle(BreakIterator *titleIter); + + /** + * Titlecase this string. + * + * Casing is locale-dependent and context-sensitive. + * Titlecasing uses a break iterator to find the first characters of words + * that are to be titlecased. It titlecases those characters and lowercases + * all others. + * + * The titlecase break iterator can be provided to customize for arbitrary + * styles, using rules and dictionaries beyond the standard iterators. + * It may be more efficient to always provide an iterator to avoid + * opening and closing one for each string. + * The standard titlecase iterator for the root locale implements the + * algorithm of Unicode TR 21. + * + * This function uses only the setText(), first() and next() methods of the + * provided break iterator. + * + * @param titleIter A break iterator to find the first characters of words + * that are to be titlecased. + * If none is provided (0), then a standard titlecase + * break iterator is opened. + * Otherwise the provided iterator is set to the string's text. + * @param locale The locale to consider. + * @return A reference to this. + * @stable ICU 2.1 + */ + UnicodeString &toTitle(BreakIterator *titleIter, const Locale &locale); + + /** + * Titlecase this string, with options. + * + * Casing is locale-dependent and context-sensitive. + * Titlecasing uses a break iterator to find the first characters of words + * that are to be titlecased. It titlecases those characters and lowercases + * all others. (This can be modified with options.) + * + * The titlecase break iterator can be provided to customize for arbitrary + * styles, using rules and dictionaries beyond the standard iterators. + * It may be more efficient to always provide an iterator to avoid + * opening and closing one for each string. + * The standard titlecase iterator for the root locale implements the + * algorithm of Unicode TR 21. + * + * This function uses only the setText(), first() and next() methods of the + * provided break iterator. + * + * @param titleIter A break iterator to find the first characters of words + * that are to be titlecased. + * If none is provided (0), then a standard titlecase + * break iterator is opened. + * Otherwise the provided iterator is set to the string's text. + * @param locale The locale to consider. + * @param options Options bit set, usually 0. See U_TITLECASE_NO_LOWERCASE, + * U_TITLECASE_NO_BREAK_ADJUSTMENT, U_TITLECASE_ADJUST_TO_CASED, + * U_TITLECASE_WHOLE_STRING, U_TITLECASE_SENTENCES. + * @param options Options bit set, see ucasemap_open(). + * @return A reference to this. + * @stable ICU 3.8 + */ + UnicodeString &toTitle(BreakIterator *titleIter, const Locale &locale, uint32_t options); + +#endif + + /** + * Case-folds the characters in this string. + * + * Case-folding is locale-independent and not context-sensitive, + * but there is an option for whether to include or exclude mappings for dotted I + * and dotless i that are marked with 'T' in CaseFolding.txt. + * + * The result may be longer or shorter than the original. + * + * @param options Either U_FOLD_CASE_DEFAULT or U_FOLD_CASE_EXCLUDE_SPECIAL_I + * @return A reference to this. + * @stable ICU 2.0 + */ + UnicodeString &foldCase(uint32_t options=0 /*U_FOLD_CASE_DEFAULT*/); + + //======================================== + // Access to the internal buffer + //======================================== + + /** + * Get a read/write pointer to the internal buffer. + * The buffer is guaranteed to be large enough for at least minCapacity char16_ts, + * writable, and is still owned by the UnicodeString object. + * Calls to getBuffer(minCapacity) must not be nested, and + * must be matched with calls to releaseBuffer(newLength). + * If the string buffer was read-only or shared, + * then it will be reallocated and copied. + * + * An attempted nested call will return 0, and will not further modify the + * state of the UnicodeString object. + * It also returns 0 if the string is bogus. + * + * The actual capacity of the string buffer may be larger than minCapacity. + * getCapacity() returns the actual capacity. + * For many operations, the full capacity should be used to avoid reallocations. + * + * While the buffer is "open" between getBuffer(minCapacity) + * and releaseBuffer(newLength), the following applies: + * - The string length is set to 0. + * - Any read API call on the UnicodeString object will behave like on a 0-length string. + * - Any write API call on the UnicodeString object is disallowed and will have no effect. + * - You can read from and write to the returned buffer. + * - The previous string contents will still be in the buffer; + * if you want to use it, then you need to call length() before getBuffer(minCapacity). + * If the length() was greater than minCapacity, then any contents after minCapacity + * may be lost. + * The buffer contents is not NUL-terminated by getBuffer(). + * If length()<getCapacity() then you can terminate it by writing a NUL + * at index length(). + * - You must call releaseBuffer(newLength) before and in order to + * return to normal UnicodeString operation. + * + * @param minCapacity the minimum number of char16_ts that are to be available + * in the buffer, starting at the returned pointer; + * default to the current string capacity if minCapacity==-1 + * @return a writable pointer to the internal string buffer, + * or nullptr if an error occurs (nested calls, out of memory) + * + * @see releaseBuffer + * @see getTerminatedBuffer() + * @stable ICU 2.0 + */ + char16_t *getBuffer(int32_t minCapacity); + + /** + * Release a read/write buffer on a UnicodeString object with an + * "open" getBuffer(minCapacity). + * This function must be called in a matched pair with getBuffer(minCapacity). + * releaseBuffer(newLength) must be called if and only if a getBuffer(minCapacity) is "open". + * + * It will set the string length to newLength, at most to the current capacity. + * If newLength==-1 then it will set the length according to the + * first NUL in the buffer, or to the capacity if there is no NUL. + * + * After calling releaseBuffer(newLength) the UnicodeString is back to normal operation. + * + * @param newLength the new length of the UnicodeString object; + * defaults to the current capacity if newLength is greater than that; + * if newLength==-1, it defaults to u_strlen(buffer) but not more than + * the current capacity of the string + * + * @see getBuffer(int32_t minCapacity) + * @stable ICU 2.0 + */ + void releaseBuffer(int32_t newLength=-1); + + /** + * Get a read-only pointer to the internal buffer. + * This can be called at any time on a valid UnicodeString. + * + * It returns 0 if the string is bogus, or + * during an "open" getBuffer(minCapacity). + * + * It can be called as many times as desired. + * The pointer that it returns will remain valid until the UnicodeString object is modified, + * at which time the pointer is semantically invalidated and must not be used any more. + * + * The capacity of the buffer can be determined with getCapacity(). + * The part after length() may or may not be initialized and valid, + * depending on the history of the UnicodeString object. + * + * The buffer contents is (probably) not NUL-terminated. + * You can check if it is with + * <code>(s.length()<s.getCapacity() && buffer[s.length()]==0)</code>. + * (See getTerminatedBuffer().) + * + * The buffer may reside in read-only memory. Its contents must not + * be modified. + * + * @return a read-only pointer to the internal string buffer, + * or nullptr if the string is empty or bogus + * + * @see getBuffer(int32_t minCapacity) + * @see getTerminatedBuffer() + * @stable ICU 2.0 + */ + inline const char16_t *getBuffer() const; + + /** + * Get a read-only pointer to the internal buffer, + * making sure that it is NUL-terminated. + * This can be called at any time on a valid UnicodeString. + * + * It returns 0 if the string is bogus, or + * during an "open" getBuffer(minCapacity), or if the buffer cannot + * be NUL-terminated (because memory allocation failed). + * + * It can be called as many times as desired. + * The pointer that it returns will remain valid until the UnicodeString object is modified, + * at which time the pointer is semantically invalidated and must not be used any more. + * + * The capacity of the buffer can be determined with getCapacity(). + * The part after length()+1 may or may not be initialized and valid, + * depending on the history of the UnicodeString object. + * + * The buffer contents is guaranteed to be NUL-terminated. + * getTerminatedBuffer() may reallocate the buffer if a terminating NUL + * is written. + * For this reason, this function is not const, unlike getBuffer(). + * Note that a UnicodeString may also contain NUL characters as part of its contents. + * + * The buffer may reside in read-only memory. Its contents must not + * be modified. + * + * @return a read-only pointer to the internal string buffer, + * or 0 if the string is empty or bogus + * + * @see getBuffer(int32_t minCapacity) + * @see getBuffer() + * @stable ICU 2.2 + */ + const char16_t *getTerminatedBuffer(); + + //======================================== + // Constructors + //======================================== + + /** Construct an empty UnicodeString. + * @stable ICU 2.0 + */ + inline UnicodeString(); + + /** + * Construct a UnicodeString with capacity to hold <TT>capacity</TT> char16_ts + * @param capacity the number of char16_ts this UnicodeString should hold + * before a resize is necessary; if count is greater than 0 and count + * code points c take up more space than capacity, then capacity is adjusted + * accordingly. + * @param c is used to initially fill the string + * @param count specifies how many code points c are to be written in the + * string + * @stable ICU 2.0 + */ + UnicodeString(int32_t capacity, UChar32 c, int32_t count); + + /** + * Single char16_t (code unit) constructor. + * + * It is recommended to mark this constructor "explicit" by + * <code>-DUNISTR_FROM_CHAR_EXPLICIT=explicit</code> + * on the compiler command line or similar. + * @param ch the character to place in the UnicodeString + * @stable ICU 2.0 + */ + UNISTR_FROM_CHAR_EXPLICIT UnicodeString(char16_t ch); + + /** + * Single UChar32 (code point) constructor. + * + * It is recommended to mark this constructor "explicit" by + * <code>-DUNISTR_FROM_CHAR_EXPLICIT=explicit</code> + * on the compiler command line or similar. + * @param ch the character to place in the UnicodeString + * @stable ICU 2.0 + */ + UNISTR_FROM_CHAR_EXPLICIT UnicodeString(UChar32 ch); + + /** + * char16_t* constructor. + * + * It is recommended to mark this constructor "explicit" by + * <code>-DUNISTR_FROM_STRING_EXPLICIT=explicit</code> + * on the compiler command line or similar. + * @param text The characters to place in the UnicodeString. <TT>text</TT> + * must be NULL (U+0000) terminated. + * @stable ICU 2.0 + */ + UNISTR_FROM_STRING_EXPLICIT UnicodeString(const char16_t *text); + +#if !U_CHAR16_IS_TYPEDEF + /** + * uint16_t * constructor. + * Delegates to UnicodeString(const char16_t *). + * + * It is recommended to mark this constructor "explicit" by + * <code>-DUNISTR_FROM_STRING_EXPLICIT=explicit</code> + * on the compiler command line or similar. + * @param text NUL-terminated UTF-16 string + * @stable ICU 59 + */ + UNISTR_FROM_STRING_EXPLICIT UnicodeString(const uint16_t *text) : + UnicodeString(ConstChar16Ptr(text)) {} +#endif + +#if U_SIZEOF_WCHAR_T==2 || defined(U_IN_DOXYGEN) + /** + * wchar_t * constructor. + * (Only defined if U_SIZEOF_WCHAR_T==2.) + * Delegates to UnicodeString(const char16_t *). + * + * It is recommended to mark this constructor "explicit" by + * <code>-DUNISTR_FROM_STRING_EXPLICIT=explicit</code> + * on the compiler command line or similar. + * @param text NUL-terminated UTF-16 string + * @stable ICU 59 + */ + UNISTR_FROM_STRING_EXPLICIT UnicodeString(const wchar_t *text) : + UnicodeString(ConstChar16Ptr(text)) {} +#endif + + /** + * nullptr_t constructor. + * Effectively the same as the default constructor, makes an empty string object. + * + * It is recommended to mark this constructor "explicit" by + * <code>-DUNISTR_FROM_STRING_EXPLICIT=explicit</code> + * on the compiler command line or similar. + * @param text nullptr + * @stable ICU 59 + */ + UNISTR_FROM_STRING_EXPLICIT inline UnicodeString(const std::nullptr_t text); + + /** + * char16_t* constructor. + * @param text The characters to place in the UnicodeString. + * @param textLength The number of Unicode characters in <TT>text</TT> + * to copy. + * @stable ICU 2.0 + */ + UnicodeString(const char16_t *text, + int32_t textLength); + +#if !U_CHAR16_IS_TYPEDEF + /** + * uint16_t * constructor. + * Delegates to UnicodeString(const char16_t *, int32_t). + * @param text UTF-16 string + * @param length string length + * @stable ICU 59 + */ + UnicodeString(const uint16_t *text, int32_t length) : + UnicodeString(ConstChar16Ptr(text), length) {} +#endif + +#if U_SIZEOF_WCHAR_T==2 || defined(U_IN_DOXYGEN) + /** + * wchar_t * constructor. + * (Only defined if U_SIZEOF_WCHAR_T==2.) + * Delegates to UnicodeString(const char16_t *, int32_t). + * @param text NUL-terminated UTF-16 string + * @param length string length + * @stable ICU 59 + */ + UnicodeString(const wchar_t *text, int32_t length) : + UnicodeString(ConstChar16Ptr(text), length) {} +#endif + + /** + * nullptr_t constructor. + * Effectively the same as the default constructor, makes an empty string object. + * @param text nullptr + * @param length ignored + * @stable ICU 59 + */ + inline UnicodeString(const std::nullptr_t text, int32_t length); + + /** + * Readonly-aliasing char16_t* constructor. + * The text will be used for the UnicodeString object, but + * it will not be released when the UnicodeString is destroyed. + * This has copy-on-write semantics: + * When the string is modified, then the buffer is first copied into + * newly allocated memory. + * The aliased buffer is never modified. + * + * In an assignment to another UnicodeString, when using the copy constructor + * or the assignment operator, the text will be copied. + * When using fastCopyFrom(), the text will be aliased again, + * so that both strings then alias the same readonly-text. + * + * @param isTerminated specifies if <code>text</code> is <code>NUL</code>-terminated. + * This must be true if <code>textLength==-1</code>. + * @param text The characters to alias for the UnicodeString. + * @param textLength The number of Unicode characters in <code>text</code> to alias. + * If -1, then this constructor will determine the length + * by calling <code>u_strlen()</code>. + * @stable ICU 2.0 + */ + UnicodeString(UBool isTerminated, + ConstChar16Ptr text, + int32_t textLength); + + /** + * Writable-aliasing char16_t* constructor. + * The text will be used for the UnicodeString object, but + * it will not be released when the UnicodeString is destroyed. + * This has write-through semantics: + * For as long as the capacity of the buffer is sufficient, write operations + * will directly affect the buffer. When more capacity is necessary, then + * a new buffer will be allocated and the contents copied as with regularly + * constructed strings. + * In an assignment to another UnicodeString, the buffer will be copied. + * The extract(Char16Ptr dst) function detects whether the dst pointer is the same + * as the string buffer itself and will in this case not copy the contents. + * + * @param buffer The characters to alias for the UnicodeString. + * @param buffLength The number of Unicode characters in <code>buffer</code> to alias. + * @param buffCapacity The size of <code>buffer</code> in char16_ts. + * @stable ICU 2.0 + */ + UnicodeString(char16_t *buffer, int32_t buffLength, int32_t buffCapacity); + +#if !U_CHAR16_IS_TYPEDEF + /** + * Writable-aliasing uint16_t * constructor. + * Delegates to UnicodeString(const char16_t *, int32_t, int32_t). + * @param buffer writable buffer of/for UTF-16 text + * @param buffLength length of the current buffer contents + * @param buffCapacity buffer capacity + * @stable ICU 59 + */ + UnicodeString(uint16_t *buffer, int32_t buffLength, int32_t buffCapacity) : + UnicodeString(Char16Ptr(buffer), buffLength, buffCapacity) {} +#endif + +#if U_SIZEOF_WCHAR_T==2 || defined(U_IN_DOXYGEN) + /** + * Writable-aliasing wchar_t * constructor. + * (Only defined if U_SIZEOF_WCHAR_T==2.) + * Delegates to UnicodeString(const char16_t *, int32_t, int32_t). + * @param buffer writable buffer of/for UTF-16 text + * @param buffLength length of the current buffer contents + * @param buffCapacity buffer capacity + * @stable ICU 59 + */ + UnicodeString(wchar_t *buffer, int32_t buffLength, int32_t buffCapacity) : + UnicodeString(Char16Ptr(buffer), buffLength, buffCapacity) {} +#endif + + /** + * Writable-aliasing nullptr_t constructor. + * Effectively the same as the default constructor, makes an empty string object. + * @param buffer nullptr + * @param buffLength ignored + * @param buffCapacity ignored + * @stable ICU 59 + */ + inline UnicodeString(std::nullptr_t buffer, int32_t buffLength, int32_t buffCapacity); + +#if U_CHARSET_IS_UTF8 || !UCONFIG_NO_CONVERSION + + /** + * char* constructor. + * Uses the default converter (and thus depends on the ICU conversion code) + * unless U_CHARSET_IS_UTF8 is set to 1. + * + * For ASCII (really "invariant character") strings it is more efficient to use + * the constructor that takes a US_INV (for its enum EInvariant). + * For ASCII (invariant-character) string literals, see UNICODE_STRING and + * UNICODE_STRING_SIMPLE. + * + * It is recommended to mark this constructor "explicit" by + * <code>-DUNISTR_FROM_STRING_EXPLICIT=explicit</code> + * on the compiler command line or similar. + * @param codepageData an array of bytes, null-terminated, + * in the platform's default codepage. + * @stable ICU 2.0 + * @see UNICODE_STRING + * @see UNICODE_STRING_SIMPLE + */ + UNISTR_FROM_STRING_EXPLICIT UnicodeString(const char *codepageData); + + /** + * char* constructor. + * Uses the default converter (and thus depends on the ICU conversion code) + * unless U_CHARSET_IS_UTF8 is set to 1. + * @param codepageData an array of bytes in the platform's default codepage. + * @param dataLength The number of bytes in <TT>codepageData</TT>. + * @stable ICU 2.0 + */ + UnicodeString(const char *codepageData, int32_t dataLength); + +#endif + +#if !UCONFIG_NO_CONVERSION + + /** + * char* constructor. + * @param codepageData an array of bytes, null-terminated + * @param codepage the encoding of <TT>codepageData</TT>. The special + * value 0 for <TT>codepage</TT> indicates that the text is in the + * platform's default codepage. + * + * If <code>codepage</code> is an empty string (<code>""</code>), + * then a simple conversion is performed on the codepage-invariant + * subset ("invariant characters") of the platform encoding. See utypes.h. + * Recommendation: For invariant-character strings use the constructor + * UnicodeString(const char *src, int32_t length, enum EInvariant inv) + * because it avoids object code dependencies of UnicodeString on + * the conversion code. + * + * @stable ICU 2.0 + */ + UnicodeString(const char *codepageData, const char *codepage); + + /** + * char* constructor. + * @param codepageData an array of bytes. + * @param dataLength The number of bytes in <TT>codepageData</TT>. + * @param codepage the encoding of <TT>codepageData</TT>. The special + * value 0 for <TT>codepage</TT> indicates that the text is in the + * platform's default codepage. + * If <code>codepage</code> is an empty string (<code>""</code>), + * then a simple conversion is performed on the codepage-invariant + * subset ("invariant characters") of the platform encoding. See utypes.h. + * Recommendation: For invariant-character strings use the constructor + * UnicodeString(const char *src, int32_t length, enum EInvariant inv) + * because it avoids object code dependencies of UnicodeString on + * the conversion code. + * + * @stable ICU 2.0 + */ + UnicodeString(const char *codepageData, int32_t dataLength, const char *codepage); + + /** + * char * / UConverter constructor. + * This constructor uses an existing UConverter object to + * convert the codepage string to Unicode and construct a UnicodeString + * from that. + * + * The converter is reset at first. + * If the error code indicates a failure before this constructor is called, + * or if an error occurs during conversion or construction, + * then the string will be bogus. + * + * This function avoids the overhead of opening and closing a converter if + * multiple strings are constructed. + * + * @param src input codepage string + * @param srcLength length of the input string, can be -1 for NUL-terminated strings + * @param cnv converter object (ucnv_resetToUnicode() will be called), + * can be NULL for the default converter + * @param errorCode normal ICU error code + * @stable ICU 2.0 + */ + UnicodeString( + const char *src, int32_t srcLength, + UConverter *cnv, + UErrorCode &errorCode); + +#endif + + /** + * Constructs a Unicode string from an invariant-character char * string. + * About invariant characters see utypes.h. + * This constructor has no runtime dependency on conversion code and is + * therefore recommended over ones taking a charset name string + * (where the empty string "" indicates invariant-character conversion). + * + * Use the macro US_INV as the third, signature-distinguishing parameter. + * + * For example: + * \code + * void fn(const char *s) { + * UnicodeString ustr(s, -1, US_INV); + * // use ustr ... + * } + * \endcode + * + * @param src String using only invariant characters. + * @param length Length of src, or -1 if NUL-terminated. + * @param inv Signature-distinguishing paramater, use US_INV. + * + * @see US_INV + * @stable ICU 3.2 + */ + UnicodeString(const char *src, int32_t length, enum EInvariant inv); + + + /** + * Copy constructor. + * + * Starting with ICU 2.4, the assignment operator and the copy constructor + * allocate a new buffer and copy the buffer contents even for readonly aliases. + * By contrast, the fastCopyFrom() function implements the old, + * more efficient but less safe behavior + * of making this string also a readonly alias to the same buffer. + * + * If the source object has an "open" buffer from getBuffer(minCapacity), + * then the copy is an empty string. + * + * @param that The UnicodeString object to copy. + * @stable ICU 2.0 + * @see fastCopyFrom + */ + UnicodeString(const UnicodeString& that); + + /** + * Move constructor, might leave src in bogus state. + * This string will have the same contents and state that the source string had. + * @param src source string + * @stable ICU 56 + */ + UnicodeString(UnicodeString &&src) U_NOEXCEPT; + + /** + * 'Substring' constructor from tail of source string. + * @param src The UnicodeString object to copy. + * @param srcStart The offset into <tt>src</tt> at which to start copying. + * @stable ICU 2.2 + */ + UnicodeString(const UnicodeString& src, int32_t srcStart); + + /** + * 'Substring' constructor from subrange of source string. + * @param src The UnicodeString object to copy. + * @param srcStart The offset into <tt>src</tt> at which to start copying. + * @param srcLength The number of characters from <tt>src</tt> to copy. + * @stable ICU 2.2 + */ + UnicodeString(const UnicodeString& src, int32_t srcStart, int32_t srcLength); + + /** + * Clone this object, an instance of a subclass of Replaceable. + * Clones can be used concurrently in multiple threads. + * If a subclass does not implement clone(), or if an error occurs, + * then NULL is returned. + * The clone functions in all subclasses return a pointer to a Replaceable + * because some compilers do not support covariant (same-as-this) + * return types; cast to the appropriate subclass if necessary. + * The caller must delete the clone. + * + * @return a clone of this object + * + * @see Replaceable::clone + * @see getDynamicClassID + * @stable ICU 2.6 + */ + virtual Replaceable *clone() const; + + /** Destructor. + * @stable ICU 2.0 + */ + virtual ~UnicodeString(); + + /** + * Create a UnicodeString from a UTF-8 string. + * Illegal input is replaced with U+FFFD. Otherwise, errors result in a bogus string. + * Calls u_strFromUTF8WithSub(). + * + * @param utf8 UTF-8 input string. + * Note that a StringPiece can be implicitly constructed + * from a std::string or a NUL-terminated const char * string. + * @return A UnicodeString with equivalent UTF-16 contents. + * @see toUTF8 + * @see toUTF8String + * @stable ICU 4.2 + */ + static UnicodeString fromUTF8(StringPiece utf8); + + /** + * Create a UnicodeString from a UTF-32 string. + * Illegal input is replaced with U+FFFD. Otherwise, errors result in a bogus string. + * Calls u_strFromUTF32WithSub(). + * + * @param utf32 UTF-32 input string. Must not be NULL. + * @param length Length of the input string, or -1 if NUL-terminated. + * @return A UnicodeString with equivalent UTF-16 contents. + * @see toUTF32 + * @stable ICU 4.2 + */ + static UnicodeString fromUTF32(const UChar32 *utf32, int32_t length); + + /* Miscellaneous operations */ + + /** + * Unescape a string of characters and return a string containing + * the result. The following escape sequences are recognized: + * + * \\uhhhh 4 hex digits; h in [0-9A-Fa-f] + * \\Uhhhhhhhh 8 hex digits + * \\xhh 1-2 hex digits + * \\ooo 1-3 octal digits; o in [0-7] + * \\cX control-X; X is masked with 0x1F + * + * as well as the standard ANSI C escapes: + * + * \\a => U+0007, \\b => U+0008, \\t => U+0009, \\n => U+000A, + * \\v => U+000B, \\f => U+000C, \\r => U+000D, \\e => U+001B, + * \\" => U+0022, \\' => U+0027, \\? => U+003F, \\\\ => U+005C + * + * Anything else following a backslash is generically escaped. For + * example, "[a\\-z]" returns "[a-z]". + * + * If an escape sequence is ill-formed, this method returns an empty + * string. An example of an ill-formed sequence is "\\u" followed by + * fewer than 4 hex digits. + * + * This function is similar to u_unescape() but not identical to it. + * The latter takes a source char*, so it does escape recognition + * and also invariant conversion. + * + * @return a string with backslash escapes interpreted, or an + * empty string on error. + * @see UnicodeString#unescapeAt() + * @see u_unescape() + * @see u_unescapeAt() + * @stable ICU 2.0 + */ + UnicodeString unescape() const; + + /** + * Unescape a single escape sequence and return the represented + * character. See unescape() for a listing of the recognized escape + * sequences. The character at offset-1 is assumed (without + * checking) to be a backslash. If the escape sequence is + * ill-formed, or the offset is out of range, U_SENTINEL=-1 is + * returned. + * + * @param offset an input output parameter. On input, it is the + * offset into this string where the escape sequence is located, + * after the initial backslash. On output, it is advanced after the + * last character parsed. On error, it is not advanced at all. + * @return the character represented by the escape sequence at + * offset, or U_SENTINEL=-1 on error. + * @see UnicodeString#unescape() + * @see u_unescape() + * @see u_unescapeAt() + * @stable ICU 2.0 + */ + UChar32 unescapeAt(int32_t &offset) const; + + /** + * ICU "poor man's RTTI", returns a UClassID for this class. + * + * @stable ICU 2.2 + */ + static UClassID U_EXPORT2 getStaticClassID(); + + /** + * ICU "poor man's RTTI", returns a UClassID for the actual class. + * + * @stable ICU 2.2 + */ + virtual UClassID getDynamicClassID() const; + + //======================================== + // Implementation methods + //======================================== + +protected: + /** + * Implement Replaceable::getLength() (see jitterbug 1027). + * @stable ICU 2.4 + */ + virtual int32_t getLength() const; + + /** + * The change in Replaceable to use virtual getCharAt() allows + * UnicodeString::charAt() to be inline again (see jitterbug 709). + * @stable ICU 2.4 + */ + virtual char16_t getCharAt(int32_t offset) const; + + /** + * The change in Replaceable to use virtual getChar32At() allows + * UnicodeString::char32At() to be inline again (see jitterbug 709). + * @stable ICU 2.4 + */ + virtual UChar32 getChar32At(int32_t offset) const; + +private: + // For char* constructors. Could be made public. + UnicodeString &setToUTF8(StringPiece utf8); + // For extract(char*). + // We could make a toUTF8(target, capacity, errorCode) public but not + // this version: New API will be cleaner if we make callers create substrings + // rather than having start+length on every method, + // and it should take a UErrorCode&. + int32_t + toUTF8(int32_t start, int32_t len, + char *target, int32_t capacity) const; + + /** + * Internal string contents comparison, called by operator==. + * Requires: this & text not bogus and have same lengths. + */ + UBool doEquals(const UnicodeString &text, int32_t len) const; + + inline int8_t + doCompare(int32_t start, + int32_t length, + const UnicodeString& srcText, + int32_t srcStart, + int32_t srcLength) const; + + int8_t doCompare(int32_t start, + int32_t length, + const char16_t *srcChars, + int32_t srcStart, + int32_t srcLength) const; + + inline int8_t + doCompareCodePointOrder(int32_t start, + int32_t length, + const UnicodeString& srcText, + int32_t srcStart, + int32_t srcLength) const; + + int8_t doCompareCodePointOrder(int32_t start, + int32_t length, + const char16_t *srcChars, + int32_t srcStart, + int32_t srcLength) const; + + inline int8_t + doCaseCompare(int32_t start, + int32_t length, + const UnicodeString &srcText, + int32_t srcStart, + int32_t srcLength, + uint32_t options) const; + + int8_t + doCaseCompare(int32_t start, + int32_t length, + const char16_t *srcChars, + int32_t srcStart, + int32_t srcLength, + uint32_t options) const; + + int32_t doIndexOf(char16_t c, + int32_t start, + int32_t length) const; + + int32_t doIndexOf(UChar32 c, + int32_t start, + int32_t length) const; + + int32_t doLastIndexOf(char16_t c, + int32_t start, + int32_t length) const; + + int32_t doLastIndexOf(UChar32 c, + int32_t start, + int32_t length) const; + + void doExtract(int32_t start, + int32_t length, + char16_t *dst, + int32_t dstStart) const; + + inline void doExtract(int32_t start, + int32_t length, + UnicodeString& target) const; + + inline char16_t doCharAt(int32_t offset) const; + + UnicodeString& doReplace(int32_t start, + int32_t length, + const UnicodeString& srcText, + int32_t srcStart, + int32_t srcLength); + + UnicodeString& doReplace(int32_t start, + int32_t length, + const char16_t *srcChars, + int32_t srcStart, + int32_t srcLength); + + UnicodeString& doAppend(const UnicodeString& src, int32_t srcStart, int32_t srcLength); + UnicodeString& doAppend(const char16_t *srcChars, int32_t srcStart, int32_t srcLength); + + UnicodeString& doReverse(int32_t start, + int32_t length); + + // calculate hash code + int32_t doHashCode(void) const; + + // get pointer to start of array + // these do not check for kOpenGetBuffer, unlike the public getBuffer() function + inline char16_t* getArrayStart(void); + inline const char16_t* getArrayStart(void) const; + + inline UBool hasShortLength() const; + inline int32_t getShortLength() const; + + // A UnicodeString object (not necessarily its current buffer) + // is writable unless it isBogus() or it has an "open" getBuffer(minCapacity). + inline UBool isWritable() const; + + // Is the current buffer writable? + inline UBool isBufferWritable() const; + + // None of the following does releaseArray(). + inline void setZeroLength(); + inline void setShortLength(int32_t len); + inline void setLength(int32_t len); + inline void setToEmpty(); + inline void setArray(char16_t *array, int32_t len, int32_t capacity); // sets length but not flags + + // allocate the array; result may be the stack buffer + // sets refCount to 1 if appropriate + // sets fArray, fCapacity, and flags + // sets length to 0 + // returns boolean for success or failure + UBool allocate(int32_t capacity); + + // release the array if owned + void releaseArray(void); + + // turn a bogus string into an empty one + void unBogus(); + + // implements assigment operator, copy constructor, and fastCopyFrom() + UnicodeString ©From(const UnicodeString &src, UBool fastCopy=FALSE); + + // Copies just the fields without memory management. + void copyFieldsFrom(UnicodeString &src, UBool setSrcToBogus) U_NOEXCEPT; + + // Pin start and limit to acceptable values. + inline void pinIndex(int32_t& start) const; + inline void pinIndices(int32_t& start, + int32_t& length) const; + +#if !UCONFIG_NO_CONVERSION + + /* Internal extract() using UConverter. */ + int32_t doExtract(int32_t start, int32_t length, + char *dest, int32_t destCapacity, + UConverter *cnv, + UErrorCode &errorCode) const; + + /* + * Real constructor for converting from codepage data. + * It assumes that it is called with !fRefCounted. + * + * If <code>codepage==0</code>, then the default converter + * is used for the platform encoding. + * If <code>codepage</code> is an empty string (<code>""</code>), + * then a simple conversion is performed on the codepage-invariant + * subset ("invariant characters") of the platform encoding. See utypes.h. + */ + void doCodepageCreate(const char *codepageData, + int32_t dataLength, + const char *codepage); + + /* + * Worker function for creating a UnicodeString from + * a codepage string using a UConverter. + */ + void + doCodepageCreate(const char *codepageData, + int32_t dataLength, + UConverter *converter, + UErrorCode &status); + +#endif + + /* + * This function is called when write access to the array + * is necessary. + * + * We need to make a copy of the array if + * the buffer is read-only, or + * the buffer is refCounted (shared), and refCount>1, or + * the buffer is too small. + * + * Return FALSE if memory could not be allocated. + */ + UBool cloneArrayIfNeeded(int32_t newCapacity = -1, + int32_t growCapacity = -1, + UBool doCopyArray = TRUE, + int32_t **pBufferToDelete = 0, + UBool forceClone = FALSE); + + /** + * Common function for UnicodeString case mappings. + * The stringCaseMapper has the same type UStringCaseMapper + * as in ustr_imp.h for ustrcase_map(). + */ + UnicodeString & + caseMap(int32_t caseLocale, uint32_t options, +#if !UCONFIG_NO_BREAK_ITERATION + BreakIterator *iter, +#endif + UStringCaseMapper *stringCaseMapper); + + // ref counting + void addRef(void); + int32_t removeRef(void); + int32_t refCount(void) const; + + // constants + enum { + /** + * Size of stack buffer for short strings. + * Must be at least U16_MAX_LENGTH for the single-code point constructor to work. + * @see UNISTR_OBJECT_SIZE + */ + US_STACKBUF_SIZE=(int32_t)(UNISTR_OBJECT_SIZE-sizeof(void *)-2)/U_SIZEOF_UCHAR, + kInvalidUChar=0xffff, // U+FFFF returned by charAt(invalid index) + kInvalidHashCode=0, // invalid hash code + kEmptyHashCode=1, // hash code for empty string + + // bit flag values for fLengthAndFlags + kIsBogus=1, // this string is bogus, i.e., not valid or NULL + kUsingStackBuffer=2,// using fUnion.fStackFields instead of fUnion.fFields + kRefCounted=4, // there is a refCount field before the characters in fArray + kBufferIsReadonly=8,// do not write to this buffer + kOpenGetBuffer=16, // getBuffer(minCapacity) was called (is "open"), + // and releaseBuffer(newLength) must be called + kAllStorageFlags=0x1f, + + kLengthShift=5, // remaining 11 bits for non-negative short length, or negative if long + kLength1=1<<kLengthShift, + kMaxShortLength=0x3ff, // max non-negative short length (leaves top bit 0) + kLengthIsLarge=0xffe0, // short length < 0, real length is in fUnion.fFields.fLength + + // combined values for convenience + kShortString=kUsingStackBuffer, + kLongString=kRefCounted, + kReadonlyAlias=kBufferIsReadonly, + kWritableAlias=0 + }; + + friend class UnicodeStringAppendable; + + union StackBufferOrFields; // forward declaration necessary before friend declaration + friend union StackBufferOrFields; // make US_STACKBUF_SIZE visible inside fUnion + + /* + * The following are all the class fields that are stored + * in each UnicodeString object. + * Note that UnicodeString has virtual functions, + * therefore there is an implicit vtable pointer + * as the first real field. + * The fields should be aligned such that no padding is necessary. + * On 32-bit machines, the size should be 32 bytes, + * on 64-bit machines (8-byte pointers), it should be 40 bytes. + * + * We use a hack to achieve this. + * + * With at least some compilers, each of the following is forced to + * a multiple of sizeof(pointer) [the largest field base unit here is a data pointer], + * rounded up with additional padding if the fields do not already fit that requirement: + * - sizeof(class UnicodeString) + * - offsetof(UnicodeString, fUnion) + * - sizeof(fUnion) + * - sizeof(fStackFields) + * + * We optimize for the longest possible internal buffer for short strings. + * fUnion.fStackFields begins with 2 bytes for storage flags + * and the length of relatively short strings, + * followed by the buffer for short string contents. + * There is no padding inside fStackFields. + * + * Heap-allocated and aliased strings use fUnion.fFields. + * Both fStackFields and fFields must begin with the same fields for flags and short length, + * that is, those must have the same memory offsets inside the object, + * because the flags must be inspected in order to decide which half of fUnion is being used. + * We assume that the compiler does not reorder the fields. + * + * (Padding at the end of fFields is ok: + * As long as it is no larger than fStackFields, it is not wasted space.) + * + * For some of the history of the UnicodeString class fields layout, see + * - ICU ticket #11551 "longer UnicodeString contents in stack buffer" + * - ICU ticket #11336 "UnicodeString: recombine stack buffer arrays" + * - ICU ticket #8322 "why is sizeof(UnicodeString)==48?" + */ + // (implicit) *vtable; + union StackBufferOrFields { + // fStackFields is used iff (fLengthAndFlags&kUsingStackBuffer) else fFields is used. + // Each struct of the union must begin with fLengthAndFlags. + struct { + int16_t fLengthAndFlags; // bit fields: see constants above + char16_t fBuffer[US_STACKBUF_SIZE]; // buffer for short strings + } fStackFields; + struct { + int16_t fLengthAndFlags; // bit fields: see constants above + int32_t fLength; // number of characters in fArray if >127; else undefined + int32_t fCapacity; // capacity of fArray (in char16_ts) + // array pointer last to minimize padding for machines with P128 data model + // or pointer sizes that are not a power of 2 + char16_t *fArray; // the Unicode data + } fFields; + } fUnion; +}; + +/** + * Create a new UnicodeString with the concatenation of two others. + * + * @param s1 The first string to be copied to the new one. + * @param s2 The second string to be copied to the new one, after s1. + * @return UnicodeString(s1).append(s2) + * @stable ICU 2.8 + */ +U_COMMON_API UnicodeString U_EXPORT2 +operator+ (const UnicodeString &s1, const UnicodeString &s2); + +//======================================== +// Inline members +//======================================== + +//======================================== +// Privates +//======================================== + +inline void +UnicodeString::pinIndex(int32_t& start) const +{ + // pin index + if(start < 0) { + start = 0; + } else if(start > length()) { + start = length(); + } +} + +inline void +UnicodeString::pinIndices(int32_t& start, + int32_t& _length) const +{ + // pin indices + int32_t len = length(); + if(start < 0) { + start = 0; + } else if(start > len) { + start = len; + } + if(_length < 0) { + _length = 0; + } else if(_length > (len - start)) { + _length = (len - start); + } +} + +inline char16_t* +UnicodeString::getArrayStart() { + return (fUnion.fFields.fLengthAndFlags&kUsingStackBuffer) ? + fUnion.fStackFields.fBuffer : fUnion.fFields.fArray; +} + +inline const char16_t* +UnicodeString::getArrayStart() const { + return (fUnion.fFields.fLengthAndFlags&kUsingStackBuffer) ? + fUnion.fStackFields.fBuffer : fUnion.fFields.fArray; +} + +//======================================== +// Default constructor +//======================================== + +inline +UnicodeString::UnicodeString() { + fUnion.fStackFields.fLengthAndFlags=kShortString; +} + +inline UnicodeString::UnicodeString(const std::nullptr_t /*text*/) { + fUnion.fStackFields.fLengthAndFlags=kShortString; +} + +inline UnicodeString::UnicodeString(const std::nullptr_t /*text*/, int32_t /*length*/) { + fUnion.fStackFields.fLengthAndFlags=kShortString; +} + +inline UnicodeString::UnicodeString(std::nullptr_t /*buffer*/, int32_t /*buffLength*/, int32_t /*buffCapacity*/) { + fUnion.fStackFields.fLengthAndFlags=kShortString; +} + +//======================================== +// Read-only implementation methods +//======================================== +inline UBool +UnicodeString::hasShortLength() const { + return fUnion.fFields.fLengthAndFlags>=0; +} + +inline int32_t +UnicodeString::getShortLength() const { + // fLengthAndFlags must be non-negative -> short length >= 0 + // and arithmetic or logical shift does not matter. + return fUnion.fFields.fLengthAndFlags>>kLengthShift; +} + +inline int32_t +UnicodeString::length() const { + return hasShortLength() ? getShortLength() : fUnion.fFields.fLength; +} + +inline int32_t +UnicodeString::getCapacity() const { + return (fUnion.fFields.fLengthAndFlags&kUsingStackBuffer) ? + US_STACKBUF_SIZE : fUnion.fFields.fCapacity; +} + +inline int32_t +UnicodeString::hashCode() const +{ return doHashCode(); } + +inline UBool +UnicodeString::isBogus() const +{ return (UBool)(fUnion.fFields.fLengthAndFlags & kIsBogus); } + +inline UBool +UnicodeString::isWritable() const +{ return (UBool)!(fUnion.fFields.fLengthAndFlags&(kOpenGetBuffer|kIsBogus)); } + +inline UBool +UnicodeString::isBufferWritable() const +{ + return (UBool)( + !(fUnion.fFields.fLengthAndFlags&(kOpenGetBuffer|kIsBogus|kBufferIsReadonly)) && + (!(fUnion.fFields.fLengthAndFlags&kRefCounted) || refCount()==1)); +} + +inline const char16_t * +UnicodeString::getBuffer() const { + if(fUnion.fFields.fLengthAndFlags&(kIsBogus|kOpenGetBuffer)) { + return nullptr; + } else if(fUnion.fFields.fLengthAndFlags&kUsingStackBuffer) { + return fUnion.fStackFields.fBuffer; + } else { + return fUnion.fFields.fArray; + } +} + +//======================================== +// Read-only alias methods +//======================================== +inline int8_t +UnicodeString::doCompare(int32_t start, + int32_t thisLength, + const UnicodeString& srcText, + int32_t srcStart, + int32_t srcLength) const +{ + if(srcText.isBogus()) { + return (int8_t)!isBogus(); // 0 if both are bogus, 1 otherwise + } else { + srcText.pinIndices(srcStart, srcLength); + return doCompare(start, thisLength, srcText.getArrayStart(), srcStart, srcLength); + } +} + +inline UBool +UnicodeString::operator== (const UnicodeString& text) const +{ + if(isBogus()) { + return text.isBogus(); + } else { + int32_t len = length(), textLength = text.length(); + return !text.isBogus() && len == textLength && doEquals(text, len); + } +} + +inline UBool +UnicodeString::operator!= (const UnicodeString& text) const +{ return (! operator==(text)); } + +inline UBool +UnicodeString::operator> (const UnicodeString& text) const +{ return doCompare(0, length(), text, 0, text.length()) == 1; } + +inline UBool +UnicodeString::operator< (const UnicodeString& text) const +{ return doCompare(0, length(), text, 0, text.length()) == -1; } + +inline UBool +UnicodeString::operator>= (const UnicodeString& text) const +{ return doCompare(0, length(), text, 0, text.length()) != -1; } + +inline UBool +UnicodeString::operator<= (const UnicodeString& text) const +{ return doCompare(0, length(), text, 0, text.length()) != 1; } + +inline int8_t +UnicodeString::compare(const UnicodeString& text) const +{ return doCompare(0, length(), text, 0, text.length()); } + +inline int8_t +UnicodeString::compare(int32_t start, + int32_t _length, + const UnicodeString& srcText) const +{ return doCompare(start, _length, srcText, 0, srcText.length()); } + +inline int8_t +UnicodeString::compare(ConstChar16Ptr srcChars, + int32_t srcLength) const +{ return doCompare(0, length(), srcChars, 0, srcLength); } + +inline int8_t +UnicodeString::compare(int32_t start, + int32_t _length, + const UnicodeString& srcText, + int32_t srcStart, + int32_t srcLength) const +{ return doCompare(start, _length, srcText, srcStart, srcLength); } + +inline int8_t +UnicodeString::compare(int32_t start, + int32_t _length, + const char16_t *srcChars) const +{ return doCompare(start, _length, srcChars, 0, _length); } + +inline int8_t +UnicodeString::compare(int32_t start, + int32_t _length, + const char16_t *srcChars, + int32_t srcStart, + int32_t srcLength) const +{ return doCompare(start, _length, srcChars, srcStart, srcLength); } + +inline int8_t +UnicodeString::compareBetween(int32_t start, + int32_t limit, + const UnicodeString& srcText, + int32_t srcStart, + int32_t srcLimit) const +{ return doCompare(start, limit - start, + srcText, srcStart, srcLimit - srcStart); } + +inline int8_t +UnicodeString::doCompareCodePointOrder(int32_t start, + int32_t thisLength, + const UnicodeString& srcText, + int32_t srcStart, + int32_t srcLength) const +{ + if(srcText.isBogus()) { + return (int8_t)!isBogus(); // 0 if both are bogus, 1 otherwise + } else { + srcText.pinIndices(srcStart, srcLength); + return doCompareCodePointOrder(start, thisLength, srcText.getArrayStart(), srcStart, srcLength); + } +} + +inline int8_t +UnicodeString::compareCodePointOrder(const UnicodeString& text) const +{ return doCompareCodePointOrder(0, length(), text, 0, text.length()); } + +inline int8_t +UnicodeString::compareCodePointOrder(int32_t start, + int32_t _length, + const UnicodeString& srcText) const +{ return doCompareCodePointOrder(start, _length, srcText, 0, srcText.length()); } + +inline int8_t +UnicodeString::compareCodePointOrder(ConstChar16Ptr srcChars, + int32_t srcLength) const +{ return doCompareCodePointOrder(0, length(), srcChars, 0, srcLength); } + +inline int8_t +UnicodeString::compareCodePointOrder(int32_t start, + int32_t _length, + const UnicodeString& srcText, + int32_t srcStart, + int32_t srcLength) const +{ return doCompareCodePointOrder(start, _length, srcText, srcStart, srcLength); } + +inline int8_t +UnicodeString::compareCodePointOrder(int32_t start, + int32_t _length, + const char16_t *srcChars) const +{ return doCompareCodePointOrder(start, _length, srcChars, 0, _length); } + +inline int8_t +UnicodeString::compareCodePointOrder(int32_t start, + int32_t _length, + const char16_t *srcChars, + int32_t srcStart, + int32_t srcLength) const +{ return doCompareCodePointOrder(start, _length, srcChars, srcStart, srcLength); } + +inline int8_t +UnicodeString::compareCodePointOrderBetween(int32_t start, + int32_t limit, + const UnicodeString& srcText, + int32_t srcStart, + int32_t srcLimit) const +{ return doCompareCodePointOrder(start, limit - start, + srcText, srcStart, srcLimit - srcStart); } + +inline int8_t +UnicodeString::doCaseCompare(int32_t start, + int32_t thisLength, + const UnicodeString &srcText, + int32_t srcStart, + int32_t srcLength, + uint32_t options) const +{ + if(srcText.isBogus()) { + return (int8_t)!isBogus(); // 0 if both are bogus, 1 otherwise + } else { + srcText.pinIndices(srcStart, srcLength); + return doCaseCompare(start, thisLength, srcText.getArrayStart(), srcStart, srcLength, options); + } +} + +inline int8_t +UnicodeString::caseCompare(const UnicodeString &text, uint32_t options) const { + return doCaseCompare(0, length(), text, 0, text.length(), options); +} + +inline int8_t +UnicodeString::caseCompare(int32_t start, + int32_t _length, + const UnicodeString &srcText, + uint32_t options) const { + return doCaseCompare(start, _length, srcText, 0, srcText.length(), options); +} + +inline int8_t +UnicodeString::caseCompare(ConstChar16Ptr srcChars, + int32_t srcLength, + uint32_t options) const { + return doCaseCompare(0, length(), srcChars, 0, srcLength, options); +} + +inline int8_t +UnicodeString::caseCompare(int32_t start, + int32_t _length, + const UnicodeString &srcText, + int32_t srcStart, + int32_t srcLength, + uint32_t options) const { + return doCaseCompare(start, _length, srcText, srcStart, srcLength, options); +} + +inline int8_t +UnicodeString::caseCompare(int32_t start, + int32_t _length, + const char16_t *srcChars, + uint32_t options) const { + return doCaseCompare(start, _length, srcChars, 0, _length, options); +} + +inline int8_t +UnicodeString::caseCompare(int32_t start, + int32_t _length, + const char16_t *srcChars, + int32_t srcStart, + int32_t srcLength, + uint32_t options) const { + return doCaseCompare(start, _length, srcChars, srcStart, srcLength, options); +} + +inline int8_t +UnicodeString::caseCompareBetween(int32_t start, + int32_t limit, + const UnicodeString &srcText, + int32_t srcStart, + int32_t srcLimit, + uint32_t options) const { + return doCaseCompare(start, limit - start, srcText, srcStart, srcLimit - srcStart, options); +} + +inline int32_t +UnicodeString::indexOf(const UnicodeString& srcText, + int32_t srcStart, + int32_t srcLength, + int32_t start, + int32_t _length) const +{ + if(!srcText.isBogus()) { + srcText.pinIndices(srcStart, srcLength); + if(srcLength > 0) { + return indexOf(srcText.getArrayStart(), srcStart, srcLength, start, _length); + } + } + return -1; +} + +inline int32_t +UnicodeString::indexOf(const UnicodeString& text) const +{ return indexOf(text, 0, text.length(), 0, length()); } + +inline int32_t +UnicodeString::indexOf(const UnicodeString& text, + int32_t start) const { + pinIndex(start); + return indexOf(text, 0, text.length(), start, length() - start); +} + +inline int32_t +UnicodeString::indexOf(const UnicodeString& text, + int32_t start, + int32_t _length) const +{ return indexOf(text, 0, text.length(), start, _length); } + +inline int32_t +UnicodeString::indexOf(const char16_t *srcChars, + int32_t srcLength, + int32_t start) const { + pinIndex(start); + return indexOf(srcChars, 0, srcLength, start, length() - start); +} + +inline int32_t +UnicodeString::indexOf(ConstChar16Ptr srcChars, + int32_t srcLength, + int32_t start, + int32_t _length) const +{ return indexOf(srcChars, 0, srcLength, start, _length); } + +inline int32_t +UnicodeString::indexOf(char16_t c, + int32_t start, + int32_t _length) const +{ return doIndexOf(c, start, _length); } + +inline int32_t +UnicodeString::indexOf(UChar32 c, + int32_t start, + int32_t _length) const +{ return doIndexOf(c, start, _length); } + +inline int32_t +UnicodeString::indexOf(char16_t c) const +{ return doIndexOf(c, 0, length()); } + +inline int32_t +UnicodeString::indexOf(UChar32 c) const +{ return indexOf(c, 0, length()); } + +inline int32_t +UnicodeString::indexOf(char16_t c, + int32_t start) const { + pinIndex(start); + return doIndexOf(c, start, length() - start); +} + +inline int32_t +UnicodeString::indexOf(UChar32 c, + int32_t start) const { + pinIndex(start); + return indexOf(c, start, length() - start); +} + +inline int32_t +UnicodeString::lastIndexOf(ConstChar16Ptr srcChars, + int32_t srcLength, + int32_t start, + int32_t _length) const +{ return lastIndexOf(srcChars, 0, srcLength, start, _length); } + +inline int32_t +UnicodeString::lastIndexOf(const char16_t *srcChars, + int32_t srcLength, + int32_t start) const { + pinIndex(start); + return lastIndexOf(srcChars, 0, srcLength, start, length() - start); +} + +inline int32_t +UnicodeString::lastIndexOf(const UnicodeString& srcText, + int32_t srcStart, + int32_t srcLength, + int32_t start, + int32_t _length) const +{ + if(!srcText.isBogus()) { + srcText.pinIndices(srcStart, srcLength); + if(srcLength > 0) { + return lastIndexOf(srcText.getArrayStart(), srcStart, srcLength, start, _length); + } + } + return -1; +} + +inline int32_t +UnicodeString::lastIndexOf(const UnicodeString& text, + int32_t start, + int32_t _length) const +{ return lastIndexOf(text, 0, text.length(), start, _length); } + +inline int32_t +UnicodeString::lastIndexOf(const UnicodeString& text, + int32_t start) const { + pinIndex(start); + return lastIndexOf(text, 0, text.length(), start, length() - start); +} + +inline int32_t +UnicodeString::lastIndexOf(const UnicodeString& text) const +{ return lastIndexOf(text, 0, text.length(), 0, length()); } + +inline int32_t +UnicodeString::lastIndexOf(char16_t c, + int32_t start, + int32_t _length) const +{ return doLastIndexOf(c, start, _length); } + +inline int32_t +UnicodeString::lastIndexOf(UChar32 c, + int32_t start, + int32_t _length) const { + return doLastIndexOf(c, start, _length); +} + +inline int32_t +UnicodeString::lastIndexOf(char16_t c) const +{ return doLastIndexOf(c, 0, length()); } + +inline int32_t +UnicodeString::lastIndexOf(UChar32 c) const { + return lastIndexOf(c, 0, length()); +} + +inline int32_t +UnicodeString::lastIndexOf(char16_t c, + int32_t start) const { + pinIndex(start); + return doLastIndexOf(c, start, length() - start); +} + +inline int32_t +UnicodeString::lastIndexOf(UChar32 c, + int32_t start) const { + pinIndex(start); + return lastIndexOf(c, start, length() - start); +} + +inline UBool +UnicodeString::startsWith(const UnicodeString& text) const +{ return compare(0, text.length(), text, 0, text.length()) == 0; } + +inline UBool +UnicodeString::startsWith(const UnicodeString& srcText, + int32_t srcStart, + int32_t srcLength) const +{ return doCompare(0, srcLength, srcText, srcStart, srcLength) == 0; } + +inline UBool +UnicodeString::startsWith(ConstChar16Ptr srcChars, int32_t srcLength) const { + if(srcLength < 0) { + srcLength = u_strlen(toUCharPtr(srcChars)); + } + return doCompare(0, srcLength, srcChars, 0, srcLength) == 0; +} + +inline UBool +UnicodeString::startsWith(const char16_t *srcChars, int32_t srcStart, int32_t srcLength) const { + if(srcLength < 0) { + srcLength = u_strlen(toUCharPtr(srcChars)); + } + return doCompare(0, srcLength, srcChars, srcStart, srcLength) == 0; +} + +inline UBool +UnicodeString::endsWith(const UnicodeString& text) const +{ return doCompare(length() - text.length(), text.length(), + text, 0, text.length()) == 0; } + +inline UBool +UnicodeString::endsWith(const UnicodeString& srcText, + int32_t srcStart, + int32_t srcLength) const { + srcText.pinIndices(srcStart, srcLength); + return doCompare(length() - srcLength, srcLength, + srcText, srcStart, srcLength) == 0; +} + +inline UBool +UnicodeString::endsWith(ConstChar16Ptr srcChars, + int32_t srcLength) const { + if(srcLength < 0) { + srcLength = u_strlen(toUCharPtr(srcChars)); + } + return doCompare(length() - srcLength, srcLength, + srcChars, 0, srcLength) == 0; +} + +inline UBool +UnicodeString::endsWith(const char16_t *srcChars, + int32_t srcStart, + int32_t srcLength) const { + if(srcLength < 0) { + srcLength = u_strlen(toUCharPtr(srcChars + srcStart)); + } + return doCompare(length() - srcLength, srcLength, + srcChars, srcStart, srcLength) == 0; +} + +//======================================== +// replace +//======================================== +inline UnicodeString& +UnicodeString::replace(int32_t start, + int32_t _length, + const UnicodeString& srcText) +{ return doReplace(start, _length, srcText, 0, srcText.length()); } + +inline UnicodeString& +UnicodeString::replace(int32_t start, + int32_t _length, + const UnicodeString& srcText, + int32_t srcStart, + int32_t srcLength) +{ return doReplace(start, _length, srcText, srcStart, srcLength); } + +inline UnicodeString& +UnicodeString::replace(int32_t start, + int32_t _length, + ConstChar16Ptr srcChars, + int32_t srcLength) +{ return doReplace(start, _length, srcChars, 0, srcLength); } + +inline UnicodeString& +UnicodeString::replace(int32_t start, + int32_t _length, + const char16_t *srcChars, + int32_t srcStart, + int32_t srcLength) +{ return doReplace(start, _length, srcChars, srcStart, srcLength); } + +inline UnicodeString& +UnicodeString::replace(int32_t start, + int32_t _length, + char16_t srcChar) +{ return doReplace(start, _length, &srcChar, 0, 1); } + +inline UnicodeString& +UnicodeString::replaceBetween(int32_t start, + int32_t limit, + const UnicodeString& srcText) +{ return doReplace(start, limit - start, srcText, 0, srcText.length()); } + +inline UnicodeString& +UnicodeString::replaceBetween(int32_t start, + int32_t limit, + const UnicodeString& srcText, + int32_t srcStart, + int32_t srcLimit) +{ return doReplace(start, limit - start, srcText, srcStart, srcLimit - srcStart); } + +inline UnicodeString& +UnicodeString::findAndReplace(const UnicodeString& oldText, + const UnicodeString& newText) +{ return findAndReplace(0, length(), oldText, 0, oldText.length(), + newText, 0, newText.length()); } + +inline UnicodeString& +UnicodeString::findAndReplace(int32_t start, + int32_t _length, + const UnicodeString& oldText, + const UnicodeString& newText) +{ return findAndReplace(start, _length, oldText, 0, oldText.length(), + newText, 0, newText.length()); } + +// ============================ +// extract +// ============================ +inline void +UnicodeString::doExtract(int32_t start, + int32_t _length, + UnicodeString& target) const +{ target.replace(0, target.length(), *this, start, _length); } + +inline void +UnicodeString::extract(int32_t start, + int32_t _length, + Char16Ptr target, + int32_t targetStart) const +{ doExtract(start, _length, target, targetStart); } + +inline void +UnicodeString::extract(int32_t start, + int32_t _length, + UnicodeString& target) const +{ doExtract(start, _length, target); } + +#if !UCONFIG_NO_CONVERSION + +inline int32_t +UnicodeString::extract(int32_t start, + int32_t _length, + char *dst, + const char *codepage) const + +{ + // This dstSize value will be checked explicitly + return extract(start, _length, dst, dst!=0 ? 0xffffffff : 0, codepage); +} + +#endif + +inline void +UnicodeString::extractBetween(int32_t start, + int32_t limit, + char16_t *dst, + int32_t dstStart) const { + pinIndex(start); + pinIndex(limit); + doExtract(start, limit - start, dst, dstStart); +} + +inline UnicodeString +UnicodeString::tempSubStringBetween(int32_t start, int32_t limit) const { + return tempSubString(start, limit - start); +} + +inline char16_t +UnicodeString::doCharAt(int32_t offset) const +{ + if((uint32_t)offset < (uint32_t)length()) { + return getArrayStart()[offset]; + } else { + return kInvalidUChar; + } +} + +inline char16_t +UnicodeString::charAt(int32_t offset) const +{ return doCharAt(offset); } + +inline char16_t +UnicodeString::operator[] (int32_t offset) const +{ return doCharAt(offset); } + +inline UBool +UnicodeString::isEmpty() const { + // Arithmetic or logical right shift does not matter: only testing for 0. + return (fUnion.fFields.fLengthAndFlags>>kLengthShift) == 0; +} + +//======================================== +// Write implementation methods +//======================================== +inline void +UnicodeString::setZeroLength() { + fUnion.fFields.fLengthAndFlags &= kAllStorageFlags; +} + +inline void +UnicodeString::setShortLength(int32_t len) { + // requires 0 <= len <= kMaxShortLength + fUnion.fFields.fLengthAndFlags = + (int16_t)((fUnion.fFields.fLengthAndFlags & kAllStorageFlags) | (len << kLengthShift)); +} + +inline void +UnicodeString::setLength(int32_t len) { + if(len <= kMaxShortLength) { + setShortLength(len); + } else { + fUnion.fFields.fLengthAndFlags |= kLengthIsLarge; + fUnion.fFields.fLength = len; + } +} + +inline void +UnicodeString::setToEmpty() { + fUnion.fFields.fLengthAndFlags = kShortString; +} + +inline void +UnicodeString::setArray(char16_t *array, int32_t len, int32_t capacity) { + setLength(len); + fUnion.fFields.fArray = array; + fUnion.fFields.fCapacity = capacity; +} + +inline UnicodeString& +UnicodeString::operator= (char16_t ch) +{ return doReplace(0, length(), &ch, 0, 1); } + +inline UnicodeString& +UnicodeString::operator= (UChar32 ch) +{ return replace(0, length(), ch); } + +inline UnicodeString& +UnicodeString::setTo(const UnicodeString& srcText, + int32_t srcStart, + int32_t srcLength) +{ + unBogus(); + return doReplace(0, length(), srcText, srcStart, srcLength); +} + +inline UnicodeString& +UnicodeString::setTo(const UnicodeString& srcText, + int32_t srcStart) +{ + unBogus(); + srcText.pinIndex(srcStart); + return doReplace(0, length(), srcText, srcStart, srcText.length() - srcStart); +} + +inline UnicodeString& +UnicodeString::setTo(const UnicodeString& srcText) +{ + return copyFrom(srcText); +} + +inline UnicodeString& +UnicodeString::setTo(const char16_t *srcChars, + int32_t srcLength) +{ + unBogus(); + return doReplace(0, length(), srcChars, 0, srcLength); +} + +inline UnicodeString& +UnicodeString::setTo(char16_t srcChar) +{ + unBogus(); + return doReplace(0, length(), &srcChar, 0, 1); +} + +inline UnicodeString& +UnicodeString::setTo(UChar32 srcChar) +{ + unBogus(); + return replace(0, length(), srcChar); +} + +inline UnicodeString& +UnicodeString::append(const UnicodeString& srcText, + int32_t srcStart, + int32_t srcLength) +{ return doAppend(srcText, srcStart, srcLength); } + +inline UnicodeString& +UnicodeString::append(const UnicodeString& srcText) +{ return doAppend(srcText, 0, srcText.length()); } + +inline UnicodeString& +UnicodeString::append(const char16_t *srcChars, + int32_t srcStart, + int32_t srcLength) +{ return doAppend(srcChars, srcStart, srcLength); } + +inline UnicodeString& +UnicodeString::append(ConstChar16Ptr srcChars, + int32_t srcLength) +{ return doAppend(srcChars, 0, srcLength); } + +inline UnicodeString& +UnicodeString::append(char16_t srcChar) +{ return doAppend(&srcChar, 0, 1); } + +inline UnicodeString& +UnicodeString::operator+= (char16_t ch) +{ return doAppend(&ch, 0, 1); } + +inline UnicodeString& +UnicodeString::operator+= (UChar32 ch) { + return append(ch); +} + +inline UnicodeString& +UnicodeString::operator+= (const UnicodeString& srcText) +{ return doAppend(srcText, 0, srcText.length()); } + +inline UnicodeString& +UnicodeString::insert(int32_t start, + const UnicodeString& srcText, + int32_t srcStart, + int32_t srcLength) +{ return doReplace(start, 0, srcText, srcStart, srcLength); } + +inline UnicodeString& +UnicodeString::insert(int32_t start, + const UnicodeString& srcText) +{ return doReplace(start, 0, srcText, 0, srcText.length()); } + +inline UnicodeString& +UnicodeString::insert(int32_t start, + const char16_t *srcChars, + int32_t srcStart, + int32_t srcLength) +{ return doReplace(start, 0, srcChars, srcStart, srcLength); } + +inline UnicodeString& +UnicodeString::insert(int32_t start, + ConstChar16Ptr srcChars, + int32_t srcLength) +{ return doReplace(start, 0, srcChars, 0, srcLength); } + +inline UnicodeString& +UnicodeString::insert(int32_t start, + char16_t srcChar) +{ return doReplace(start, 0, &srcChar, 0, 1); } + +inline UnicodeString& +UnicodeString::insert(int32_t start, + UChar32 srcChar) +{ return replace(start, 0, srcChar); } + + +inline UnicodeString& +UnicodeString::remove() +{ + // remove() of a bogus string makes the string empty and non-bogus + if(isBogus()) { + setToEmpty(); + } else { + setZeroLength(); + } + return *this; +} + +inline UnicodeString& +UnicodeString::remove(int32_t start, + int32_t _length) +{ + if(start <= 0 && _length == INT32_MAX) { + // remove(guaranteed everything) of a bogus string makes the string empty and non-bogus + return remove(); + } + return doReplace(start, _length, NULL, 0, 0); +} + +inline UnicodeString& +UnicodeString::removeBetween(int32_t start, + int32_t limit) +{ return doReplace(start, limit - start, NULL, 0, 0); } + +inline UnicodeString & +UnicodeString::retainBetween(int32_t start, int32_t limit) { + truncate(limit); + return doReplace(0, start, NULL, 0, 0); +} + +inline UBool +UnicodeString::truncate(int32_t targetLength) +{ + if(isBogus() && targetLength == 0) { + // truncate(0) of a bogus string makes the string empty and non-bogus + unBogus(); + return FALSE; + } else if((uint32_t)targetLength < (uint32_t)length()) { + setLength(targetLength); + return TRUE; + } else { + return FALSE; + } +} + +inline UnicodeString& +UnicodeString::reverse() +{ return doReverse(0, length()); } + +inline UnicodeString& +UnicodeString::reverse(int32_t start, + int32_t _length) +{ return doReverse(start, _length); } + +U_NAMESPACE_END + +#endif |