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// © 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 the buffer passed to an insert/append/replace operation is owned by the
* target object, e.g., calling str.append(str), an extra copy may take place
* to ensure safety.
* - 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.