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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 "unicode/utypes.h"
#if U_SHOW_CPLUSPLUS_API
#include <cstddef>
#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
* @param s Pointer to sequence of UChars.
* @return Length of sequence.
*/
U_CAPI 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
* `NUL`, 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).
*
* The UnicodeString equivalent of std::string’s clear() is remove().
*
* A UnicodeString may "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.
*
* For an overview of Unicode strings in C and C++ see the
* [User Guide Strings chapter](https://unicode-org.github.io/icu/userguide/strings#strings-in-cc).
*
* In ICU, a Unicode string consists of 16-bit Unicode *code units*.
* 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 *point* is a value
* in the range 0..0x10ffff. ICU uses the UChar32 type for code points.
*
* 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).
*
* 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 nullptr, then those input string parameters are treated
* as if they pointed to an empty string.
* However, this is *not* 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.
*
* 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
* [User Guide Strings chapter](https://unicode-org.github.io/icu/userguide/strings#maximizing-performance-with-the-unicodestring-storage-model).
*
* @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 `text` contains the same characters as this one,
* false otherwise.
* @stable ICU 2.0
*/
inline bool operator== (const UnicodeString& text) const;
/**
* Inequality operator. Performs only bitwise comparison.
* @param text The UnicodeString to compare to this one.
* @return false if `text` contains the same characters as this one,
* true otherwise.
* @stable ICU 2.0
*/
inline bool 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 `text`, 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 `text`, 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 `text`, 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 `text`, false otherwise
* @stable ICU 2.0
*/
inline UBool operator<= (const UnicodeString& text) const;
/**
* Compare the characters bitwise in this UnicodeString to
* the characters in `text`.
* @param text The UnicodeString to compare to this one.
* @return The result of bitwise character comparison: 0 if this
* contains the same characters as `text`, -1 if the characters in
* this are bitwise less than the characters in `text`, +1 if the
* characters in this are bitwise greater than the characters
* in `text`.
* @stable ICU 2.0
*/
inline int8_t compare(const UnicodeString& text) const;
/**
* Compare the characters bitwise in the range
* [`start`, `start + length`) with the characters
* in the **entire string** `text`.
* (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 `text`, -1 if the characters in
* this are bitwise less than the characters in `text`, +1 if the
* characters in this are bitwise greater than the characters
* in `text`.
* @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
* [`start`, `start + length`) with the characters
* in `srcText` in the range
* [`srcStart`, `srcStart + srcLength`).
* @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 `srcText` to start comparison
* @param srcLength the number of characters in `src` to compare
* @return The result of bitwise character comparison: 0 if this
* contains the same characters as `srcText`, -1 if the characters in
* this are bitwise less than the characters in `srcText`, +1 if the
* characters in this are bitwise greater than the characters
* in `srcText`.
* @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
* `srcLength` characters in `srcChars`.
* @param srcChars The characters to compare to this UnicodeString.
* @param srcLength the number of characters in `srcChars` to compare
* @return The result of bitwise character comparison: 0 if this
* contains the same characters as `srcChars`, -1 if the characters in
* this are bitwise less than the characters in `srcChars`, +1 if the
* characters in this are bitwise greater than the characters
* in `srcChars`.
* @stable ICU 2.0
*/
inline int8_t compare(ConstChar16Ptr srcChars,
int32_t srcLength) const;
/**
* Compare the characters bitwise in the range
* [`start`, `start + length`) with the first
* `length` characters in `srcChars`
* @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 `srcChars`, -1 if the characters in
* this are bitwise less than the characters in `srcChars`, +1 if the
* characters in this are bitwise greater than the characters
* in `srcChars`.
* @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
* [`start`, `start + length`) with the characters
* in `srcChars` in the range
* [`srcStart`, `srcStart + srcLength`).
* @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 `srcChars` to start comparison
* @param srcLength the number of characters in `srcChars` to compare
* @return The result of bitwise character comparison: 0 if this
* contains the same characters as `srcChars`, -1 if the characters in
* this are bitwise less than the characters in `srcChars`, +1 if the
* characters in this are bitwise greater than the characters
* in `srcChars`.
* @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
* [`start`, `limit`) with the characters
* in `srcText` in the range
* [`srcStart`, `srcLimit`).
* @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 `srcText` to start comparison
* @param srcLimit the offset into `srcText` to limit comparison
* @return The result of bitwise character comparison: 0 if this
* contains the same characters as `srcText`, -1 if the characters in
* this are bitwise less than the characters in `srcText`, +1 if the
* characters in this are bitwise greater than the characters
* in `srcText`.
* @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 `text`
* @param text The text to match.
* @return true if this starts with the characters in `text`,
* false otherwise
* @stable ICU 2.0
*/
inline UBool startsWith(const UnicodeString& text) const;
/**
* Determine if this starts with the characters in `srcText`
* in the range [`srcStart`, `srcStart + srcLength`).
* @param srcText The text to match.
* @param srcStart the offset into `srcText` to start matching
* @param srcLength the number of characters in `srcText` to match
* @return true if this starts with the characters in `text`,
* 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 `srcChars`
* @param srcChars The characters to match.
* @param srcLength the number of characters in `srcChars`
* @return true if this starts with the characters in `srcChars`,
* false otherwise
* @stable ICU 2.0
*/
inline UBool startsWith(ConstChar16Ptr srcChars,
int32_t srcLength) const;
/**
* Determine if this ends with the characters in `srcChars`
* in the range [`srcStart`, `srcStart + srcLength`).
* @param srcChars The characters to match.
* @param srcStart the offset into `srcText` to start matching
* @param srcLength the number of characters in `srcChars` to match
* @return true if this ends with the characters in `srcChars`, 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 `text`
* @param text The text to match.
* @return true if this ends with the characters in `text`,
* false otherwise
* @stable ICU 2.0
*/
inline UBool endsWith(const UnicodeString& text) const;
/**
* Determine if this ends with the characters in `srcText`
* in the range [`srcStart`, `srcStart + srcLength`).
* @param srcText The text to match.
* @param srcStart the offset into `srcText` to start matching
* @param srcLength the number of characters in `srcText` to match
* @return true if this ends with the characters in `text`,
* 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 `srcChars`
* @param srcChars The characters to match.
* @param srcLength the number of characters in `srcChars`
* @return true if this ends with the characters in `srcChars`,
* false otherwise
* @stable ICU 2.0
*/
inline UBool endsWith(ConstChar16Ptr srcChars,
int32_t srcLength) const;
/**
* Determine if this ends with the characters in `srcChars`
* in the range [`srcStart`, `srcStart + srcLength`).
* @param srcChars The characters to match.
* @param srcStart the offset into `srcText` to start matching
* @param srcLength the number of characters in `srcChars` to match
* @return true if this ends with the characters in `srcChars`,
* 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 `text`,
* using bitwise comparison.
* @param text The text to search for.
* @return The offset into this of the start of `text`,
* 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 `text`
* starting at offset `start`, 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 `text`,
* 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
* [`start`, `start + length`) of the characters
* in `text`, 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 `text`,
* 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
* [`start`, `start + length`) of the characters
* in `srcText` in the range
* [`srcStart`, `srcStart + srcLength`),
* using bitwise comparison.
* @param srcText The text to search for.
* @param srcStart the offset into `srcText` at which
* to start matching
* @param srcLength the number of characters in `srcText` 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 `text`,
* 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
* `srcChars`
* starting at offset `start`, using bitwise comparison.
* @param srcChars The text to search for.
* @param srcLength the number of characters in `srcChars` to match
* @param start the offset into this at which to start matching
* @return The offset into this of the start of `text`,
* 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
* [`start`, `start + length`) of the characters
* in `srcChars`, using bitwise comparison.
* @param srcChars The text to search for.
* @param srcLength the number of characters in `srcChars`
* @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 `srcChars`,
* 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
* [`start`, `start + length`) of the characters
* in `srcChars` in the range
* [`srcStart`, `srcStart + srcLength`),
* using bitwise comparison.
* @param srcChars The text to search for.
* @param srcStart the offset into `srcChars` at which
* to start matching
* @param srcLength the number of characters in `srcChars` 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 `text`,
* 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 `c`,
* using bitwise comparison.
* @param c The code unit to search for.
* @return The offset into this of `c`, 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 `c`,
* using bitwise comparison.
*
* @param c The code point to search for.
* @return The offset into this of `c`, 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 `c`,
* starting at offset `start`, 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 `c`, 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 `c`
* starting at offset `start`, 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 `c`, 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 `c`
* in the range [`start`, `start + length`),
* 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 `c`, 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 `c`
* in the range [`start`, `start + length`),
* 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 `c`, 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 `text`,
* using bitwise comparison.
* @param text The text to search for.
* @return The offset into this of the start of `text`,
* 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 `text`
* starting at offset `start`, 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 `text`,
* 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
* [`start`, `start + length`) of the characters
* in `text`, 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 `text`,
* 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
* [`start`, `start + length`) of the characters
* in `srcText` in the range
* [`srcStart`, `srcStart + srcLength`),
* using bitwise comparison.
* @param srcText The text to search for.
* @param srcStart the offset into `srcText` at which
* to start matching
* @param srcLength the number of characters in `srcText` 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 `text`,
* 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 `srcChars`
* starting at offset `start`, using bitwise comparison.
* @param srcChars The text to search for.
* @param srcLength the number of characters in `srcChars` to match
* @param start the offset into this at which to start matching
* @return The offset into this of the start of `text`,
* 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
* [`start`, `start + length`) of the characters
* in `srcChars`, using bitwise comparison.
* @param srcChars The text to search for.
* @param srcLength the number of characters in `srcChars`
* @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 `srcChars`,
* 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
* [`start`, `start + length`) of the characters
* in `srcChars` in the range
* [`srcStart`, `srcStart + srcLength`),
* using bitwise comparison.
* @param srcChars The text to search for.
* @param srcStart the offset into `srcChars` at which
* to start matching
* @param srcLength the number of characters in `srcChars` 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 `text`,
* 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 `c`,
* using bitwise comparison.
* @param c The code unit to search for.
* @return The offset into this of `c`, 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 `c`,
* using bitwise comparison.
*
* @param c The code point to search for.
* @return The offset into this of `c`, 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 `c`
* starting at offset `start`, 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 `c`, 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 `c`
* starting at offset `start`, 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 `c`, 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 `c`
* in the range [`start`, `start + length`),
* 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 `c`, 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 `c`
* in the range [`start`, `start + length`),
* 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 `c`, 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 `offset`.
* 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 `offset`
* 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 `offset`.
* 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 `offset`
* @stable ICU 2.0
*/
inline char16_t operator[] (int32_t offset) const;
/**
* Return the code point that contains the code unit
* at offset `offset`.
* 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 `offset`
* 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:
* `moveIndex32` 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 `delta` 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:
* \code
* // s has code points 'a' U+10000 'b' U+10ffff U+2029
* UnicodeString s(u"a\U00010000b\U0010ffff\u2029");
*
* // 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
* \endcode
*
* @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
* [`start`, `start + length`) into the array `dst`,
* beginning at `dstStart`.
* If the string aliases to `dst` 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 `dst`
* must be at least (`dstStart + length`).
* @param dstStart the offset in `dst` 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 `dest` 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
* [`start`, `start + length`) into the UnicodeString
* `target`.
* @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.
* @stable ICU 2.0
*/
inline void extract(int32_t start,
int32_t length,
UnicodeString& target) const;
/**
* Copy the characters in the range [`start`, `limit`)
* into the array `dst`, beginning at `dstStart`.
* @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 `dst`
* must be at least (`dstStart + (limit - start)`).
* @param dstStart the offset in `dst` 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 [`start`, `limit`)
* into the UnicodeString `target`. 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.
* @stable ICU 2.0
*/
virtual void extractBetween(int32_t start,
int32_t limit,
UnicodeString& target) const override;
/**
* Copy the characters in the range
* [`start`, `start + startLength`) 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 `targetCapacity`
* 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 nullptr
* if targetLength is 0
* @param targetCapacity the length of the target buffer
* @param inv Signature-distinguishing parameter, 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
* [`start`, `start + length`) into an array of characters
* in the platform's default codepage.
* This function does not write any more than `targetLength`
* 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 `target` is nullptr, then the number of bytes required for
* `target` 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
* [`start`, `start + length`) 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 `codepage` is an empty string (`""`),
* then a simple conversion is performed on the codepage-invariant
* subset ("invariant characters") of the platform encoding. See utypes.h.
* If `target` is nullptr, then the number of bytes required for
* `target` 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 = nullptr) const;
/**
* Copy the characters in the range
* [`start`, `start + length`) into an array of characters
* in a specified codepage.
* This function does not write any more than `targetLength`
* 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 `codepage` is an empty string (`""`),
* then a simple conversion is performed on the codepage-invariant
* subset ("invariant characters") of the platform encoding. See utypes.h.
* If `target` is nullptr, then the number of bytes required for
* `target` 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 nullptr 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 nullptr 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 nullptr 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() 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() 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() 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() 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 nullptr, and
* length() returns 0.
*
* @return true if the string is bogus/invalid, false otherwise
* @see setToBogus()
* @stable ICU 2.0
*/
inline UBool isBogus() const;
//========================================
// Write operations
//========================================
/* Assignment operations */
/**
* Assignment operator. Replace the characters in this UnicodeString
* with the characters from `srcText`.
*
* 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 `srcText`.
*
* 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) noexcept;
/**
* Swap strings.
* @param other other string
* @stable ICU 56
*/
void swap(UnicodeString &other) 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 inline void U_EXPORT2
swap(UnicodeString &s1, UnicodeString &s2) noexcept {
s1.swap(s2);
}
/**
* Assignment operator. Replace the characters in this UnicodeString
* with the code unit `ch`.
* @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 `ch`.
* @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 `srcText` in the range
* [`srcStart`, `srcText.length()`).
* `srcText` is not modified.
* @param srcText the source for the new characters
* @param srcStart the offset into `srcText` 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 `srcText` in the range
* [`srcStart`, `srcStart + srcLength`).
* `srcText` is not modified.
* @param srcText the source for the new characters
* @param srcStart the offset into `srcText` where new characters
* will be obtained
* @param srcLength the number of characters in `srcText` 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
* `srcText`.
* `srcText` 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 `srcChars`. `srcChars` 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
* `srcChar`.
* @param srcChar the code unit which becomes the UnicodeString's character
* content
* @return a reference to this
* @stable ICU 2.0
*/
inline UnicodeString& setTo(char16_t srcChar);
/**
* Set the characters in the UnicodeString object to the code point
* `srcChar`.
* @param srcChar the code point which becomes the UnicodeString's character
* content
* @return a reference to this
* @stable ICU 2.0
*/
inline 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 `text` is `NUL`-terminated.
* This must be true if `textLength==-1`.
* @param text The characters to alias for the UnicodeString.
* @param textLength The number of Unicode characters in `text` to alias.
* If -1, then this constructor will determine the length
* by calling `u_strlen()`.
* @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 `buffer` to alias.
* @param buffCapacity The size of `buffer` 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 nullptr, 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
* s.setTo(u"", 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 `ch` 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 `ch` 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 `srcText` to the
* UnicodeString object. `srcText` 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 `srcText` in the range
* [`srcStart`, `srcStart + srcLength`) to the
* UnicodeString object at offset `start`. `srcText`
* is not modified.
* @param srcText the source for the new characters
* @param srcStart the offset into `srcText` where new characters
* will be obtained
* @param srcLength the number of characters in `srcText` 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 `srcText` to the UnicodeString object.
* `srcText` 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 `srcChars` in the range
* [`srcStart`, `srcStart + srcLength`) to the UnicodeString
* object at offset
* `start`. `srcChars` is not modified.
* @param srcChars the source for the new characters
* @param srcStart the offset into `srcChars` where new characters
* will be obtained
* @param srcLength the number of characters in `srcChars` in
* the append string; can be -1 if `srcChars` 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 `srcChars` to the UnicodeString object
* at offset `start`. `srcChars` is not modified.
* @param srcChars the source for the new characters
* @param srcLength the number of Unicode characters in `srcChars`;
* can be -1 if `srcChars` is NUL-terminated
* @return a reference to this
* @stable ICU 2.0
*/
inline UnicodeString& append(ConstChar16Ptr srcChars,
int32_t srcLength);
/**
* Append the code unit `srcChar` 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 `srcChar` 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 `srcText` in the range
* [`srcStart`, `srcStart + srcLength`) into the UnicodeString
* object at offset `start`. `srcText` is not modified.
* @param start the offset where the insertion begins
* @param srcText the source for the new characters
* @param srcStart the offset into `srcText` where new characters
* will be obtained
* @param srcLength the number of characters in `srcText` 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 `srcText` into the UnicodeString object
* at offset `start`. `srcText` 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 `srcChars` in the range
* [`srcStart`, `srcStart + srcLength`) into the UnicodeString
* object at offset `start`. `srcChars` 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 `srcChars` where new characters
* will be obtained
* @param srcLength the number of characters in `srcChars`
* 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 `srcChars` into the UnicodeString object
* at offset `start`. `srcChars` 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 `srcChar` into the UnicodeString object at
* offset `start`.
* @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 `srcChar` into the UnicodeString object at
* offset `start`.
* @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
* [`start`, `start + length`) with the characters in
* `srcText` in the range
* [`srcStart`, `srcStart + srcLength`).
* `srcText` is not modified.
* @param start the offset at which the replace operation begins
* @param length the number of characters to replace. The character at
* `start + length` is not modified.
* @param srcText the source for the new characters
* @param srcStart the offset into `srcText` where new characters
* will be obtained
* @param srcLength the number of characters in `srcText` in
* the replace string
* @return a reference to this
* @stable ICU 2.0
*/
inline UnicodeString& replace(int32_t start,
int32_t length,
const UnicodeString& srcText,
int32_t srcStart,
int32_t srcLength);
/**
* Replace the characters in the range
* [`start`, `start + length`)
* with the characters in `srcText`. `srcText` is
* not modified.
* @param start the offset at which the replace operation begins
* @param length the number of characters to replace. The character at
* `start + length` is not modified.
* @param srcText the source for the new characters
* @return a reference to this
* @stable ICU 2.0
*/
inline UnicodeString& replace(int32_t start,
int32_t length,
const UnicodeString& srcText);
/**
* Replace the characters in the range
* [`start`, `start + length`) with the characters in
* `srcChars` in the range
* [`srcStart`, `srcStart + srcLength`). `srcChars`
* is not modified.
* @param start the offset at which the replace operation begins
* @param length the number of characters to replace. The character at
* `start + length` is not modified.
* @param srcChars the source for the new characters
* @param srcStart the offset into `srcChars` where new characters
* will be obtained
* @param srcLength the number of characters in `srcChars`
* in the replace string
* @return a reference to this
* @stable ICU 2.0
*/
inline UnicodeString& replace(int32_t start,
int32_t length,
const char16_t *srcChars,
int32_t srcStart,
int32_t srcLength);
/**
* Replace the characters in the range
* [`start`, `start + length`) with the characters in
* `srcChars`. `srcChars` is not modified.
* @param start the offset at which the replace operation begins
* @param length number of characters to replace. The character at
* `start + length` 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
* [`start`, `start + length`) with the code unit
* `srcChar`.
* @param start the offset at which the replace operation begins
* @param length the number of characters to replace. The character at
* `start + length` 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
* [`start`, `start + length`) with the code point
* `srcChar`.
* @param start the offset at which the replace operation begins
* @param length the number of characters to replace. The character at
* `start + length` 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 [`start`, `limit`)
* with the characters in `srcText`. `srcText` 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 [`start`, `limit`)
* with the characters in `srcText` in the range
* [`srcStart`, `srcLimit`). `srcText` 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 `srcChars` where new characters
* will be obtained
* @param srcLimit the offset immediately following the range to copy
* in `srcText`
* @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; `0 <= start <= limit`.
* @param limit the ending index, exclusive; `start <= limit <= length()`.
* @param text the text to replace characters `start` to `limit - 1`
* @stable ICU 2.0
*/
virtual void handleReplaceBetween(int32_t start,
int32_t limit,
const UnicodeString& text) override;
/**
* Replaceable API
* @return true if it has MetaData
* @stable ICU 2.4
*/
virtual UBool hasMetaData() const override;
/**
* 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; `0 <= start <= limit`.
* @param limit the ending index, exclusive; `start <= limit <= length()`.
* @param dest the destination index. The characters from
* `start..limit-1` will be copied to `dest`.
* Implementations of this method may assume that `dest <= start ||
* dest >= limit`.
* @stable ICU 2.0
*/
virtual void copy(int32_t start, int32_t limit, int32_t dest) override;
/* 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 [`start`, `start + length`).
* @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
* [`oldStart`, `oldStart + oldLength`) with the characters
* in newText in the range
* [`newStart`, `newStart + newLength`)
* in the range [`start`, `start + length`).
* @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 `oldText`
* @param oldLength the length of the search range in `oldText`
* @param newText the text containing the replacement text
* @param newStart the start of the replacement range in `newText`
* @param newLength the length of the replacement range in `newText`
* @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 */
/**
* Removes all characters from the UnicodeString object and clears the bogus flag.
* This is the UnicodeString equivalent of std::string’s clear().
*
* @return a reference to this
* @see setToBogus
* @stable ICU 2.0
*/
inline UnicodeString& remove();
/**
* Remove the characters in the range
* [`start`, `start + length`) 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
* [`start`, `limit`) 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
* [`start`, `limit`) from the UnicodeString object.
* Removes characters before `start` and at and after `limit`.
* @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 `padChar`.
* 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 `padChar`.
* 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 `targetLength`.
* @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();
/* Miscellaneous operations */
/**
* Reverse this UnicodeString in place.
* @return a reference to this
* @stable ICU 2.0
*/
inline UnicodeString& reverse();
/**
* Reverse the range [`start`, `start + length`) 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();
/**
* 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();
/**
* 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.
* @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
* `(s.length() < s.getCapacity() && buffer[s.length()]==0)`.
* (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 `capacity` 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
* `-DUNISTR_FROM_CHAR_EXPLICIT=explicit`
* 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
* `-DUNISTR_FROM_CHAR_EXPLICIT=explicit`
* 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
* `-DUNISTR_FROM_STRING_EXPLICIT=explicit`
* on the compiler command line or similar.
* @param text The characters to place in the UnicodeString. `text`
* must be NUL (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
* `-DUNISTR_FROM_STRING_EXPLICIT=explicit`
* 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
* `-DUNISTR_FROM_STRING_EXPLICIT=explicit`
* 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
* `-DUNISTR_FROM_STRING_EXPLICIT=explicit`
* 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 `text`
* 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 textLength string length
* @stable ICU 59
*/
UnicodeString(const uint16_t *text, int32_t textLength) :
UnicodeString(ConstChar16Ptr(text), textLength) {}
#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 textLength string length
* @stable ICU 59
*/
UnicodeString(const wchar_t *text, int32_t textLength) :
UnicodeString(ConstChar16Ptr(text), textLength) {}
#endif
/**
* nullptr_t constructor.
* Effectively the same as the default constructor, makes an empty string object.
* @param text nullptr
* @param textLength ignored
* @stable ICU 59
*/
inline UnicodeString(const std::nullptr_t text, int32_t textLength);
/**
* 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 `text` is `NUL`-terminated.
* This must be true if `textLength==-1`.
* @param text The characters to alias for the UnicodeString.
* @param textLength The number of Unicode characters in `text` to alias.
* If -1, then this constructor will determine the length
* by calling `u_strlen()`.
* @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 `buffer` to alias.
* @param buffCapacity The size of `buffer` 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
* `-DUNISTR_FROM_STRING_EXPLICIT=explicit`
* 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 `codepageData`.
* @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 `codepageData`. The special
* value 0 for `codepage` indicates that the text is in the
* platform's default codepage.
*
* If `codepage` is an empty string (`""`),
* 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 `codepageData`.
* @param codepage the encoding of `codepageData`. The special
* value 0 for `codepage` indicates that the text is in the
* platform's default codepage.
* If `codepage` is an empty string (`""`),
* 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 nullptr 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 textLength Length of src, or -1 if NUL-terminated.
* @param inv Signature-distinguishing parameter, use US_INV.
*
* @see US_INV
* @stable ICU 3.2
*/
UnicodeString(const char *src, int32_t textLength, enum EInvariant inv);
/**
* Copy constructor.
*
* Starting with ICU 2.4, the assignment operator and the copy constructor
* allocate a new buffer and copy the buffer contents even for readonly aliases.
* By contrast, the fastCopyFrom() function implements the old,
* more efficient but less safe behavior
* of making this string also a readonly alias to the same buffer.
*
* If the source object has an "open" buffer from getBuffer(minCapacity),
* then the copy is an empty string.
*
* @param that The UnicodeString object to copy.
* @stable ICU 2.0
* @see fastCopyFrom
*/
UnicodeString(const UnicodeString& that);
/**
* Move constructor; might leave src in bogus state.
* This string will have the same contents and state that the source string had.
* @param src source string
* @stable ICU 56
*/
UnicodeString(UnicodeString &&src) noexcept;
/**
* 'Substring' constructor from tail of source string.
* @param src The UnicodeString object to copy.
* @param srcStart The offset into `src` at which to start copying.
* @stable ICU 2.2
*/
UnicodeString(const UnicodeString& src, int32_t srcStart);
/**
* 'Substring' constructor from subrange of source string.
* @param src The UnicodeString object to copy.
* @param srcStart The offset into `src` at which to start copying.
* @param srcLength The number of characters from `src` to copy.
* @stable ICU 2.2
*/
UnicodeString(const UnicodeString& src, int32_t srcStart, int32_t srcLength);
/**
* Clone this object, an instance of a subclass of Replaceable.
* Clones can be used concurrently in multiple threads.
* If a subclass does not implement clone(), or if an error occurs,
* then nullptr is returned.
* The caller must delete the clone.
*
* @return a clone of this object
*
* @see Replaceable::clone
* @see getDynamicClassID
* @stable ICU 2.6
*/
virtual UnicodeString *clone() const override;
/** Destructor.
* @stable ICU 2.0
*/
virtual ~UnicodeString();
/**
* Create a UnicodeString from a UTF-8 string.
* Illegal input is replaced with U+FFFD. Otherwise, errors result in a bogus string.
* Calls u_strFromUTF8WithSub().
*
* @param utf8 UTF-8 input string.
* Note that a StringPiece can be implicitly constructed
* from a std::string or a NUL-terminated const char * string.
* @return A UnicodeString with equivalent UTF-16 contents.
* @see toUTF8
* @see toUTF8String
* @stable ICU 4.2
*/
static UnicodeString fromUTF8(StringPiece utf8);
/**
* Create a UnicodeString from a UTF-32 string.
* Illegal input is replaced with U+FFFD. Otherwise, errors result in a bogus string.
* Calls u_strFromUTF32WithSub().
*
* @param utf32 UTF-32 input string. Must not be nullptr.
* @param length Length of the input string, or -1 if NUL-terminated.
* @return A UnicodeString with equivalent UTF-16 contents.
* @see toUTF32
* @stable ICU 4.2
*/
static UnicodeString fromUTF32(const UChar32 *utf32, int32_t length);
/* Miscellaneous operations */
/**
* Unescape a string of characters and return a string containing
* the result. The following escape sequences are recognized:
*
* \\uhhhh 4 hex digits; h in [0-9A-Fa-f]
* \\Uhhhhhhhh 8 hex digits
* \\xhh 1-2 hex digits
* \\ooo 1-3 octal digits; o in [0-7]
* \\cX control-X; X is masked with 0x1F
*
* as well as the standard ANSI C escapes:
*
* \\a => U+0007, \\b => U+0008, \\t => U+0009, \\n => U+000A,
* \\v => U+000B, \\f => U+000C, \\r => U+000D, \\e => U+001B,
* \\" => U+0022, \\' => U+0027, \\? => U+003F, \\\\ => U+005C
*
* Anything else following a backslash is generically escaped. For
* example, "[a\\-z]" returns "[a-z]".
*
* If an escape sequence is ill-formed, this method returns an empty
* string. An example of an ill-formed sequence is "\\u" followed by
* fewer than 4 hex digits.
*
* This function is similar to u_unescape() but not identical to it.
* The latter takes a source char*, so it does escape recognition
* and also invariant conversion.
*
* @return a string with backslash escapes interpreted, or an
* empty string on error.
* @see UnicodeString#unescapeAt()
* @see u_unescape()
* @see u_unescapeAt()
* @stable ICU 2.0
*/
UnicodeString unescape() const;
/**
* Unescape a single escape sequence and return the represented
* character. See unescape() for a listing of the recognized escape
* sequences. The character at offset-1 is assumed (without
* checking) to be a backslash. If the escape sequence is
* ill-formed, or the offset is out of range, U_SENTINEL=-1 is
* returned.
*
* @param offset an input output parameter. On input, it is the
* offset into this string where the escape sequence is located,
* after the initial backslash. On output, it is advanced after the
* last character parsed. On error, it is not advanced at all.
* @return the character represented by the escape sequence at
* offset, or U_SENTINEL=-1 on error.
* @see UnicodeString#unescape()
* @see u_unescape()
* @see u_unescapeAt()
* @stable ICU 2.0
*/
UChar32 unescapeAt(int32_t &offset) const;
/**
* ICU "poor man's RTTI", returns a UClassID for this class.
*
* @stable ICU 2.2
*/
static UClassID U_EXPORT2 getStaticClassID();
/**
* ICU "poor man's RTTI", returns a UClassID for the actual class.
*
* @stable ICU 2.2
*/
virtual UClassID getDynamicClassID() const override;
//========================================
// Implementation methods
//========================================
protected:
/**
* Implement Replaceable::getLength() (see jitterbug 1027).
* @stable ICU 2.4
*/
virtual int32_t getLength() const override;
/**
* The change in Replaceable to use virtual getCharAt() allows
* UnicodeString::charAt() to be inline again (see jitterbug 709).
* @stable ICU 2.4
*/
virtual char16_t getCharAt(int32_t offset) const override;
/**
* The change in Replaceable to use virtual getChar32At() allows
* UnicodeString::char32At() to be inline again (see jitterbug 709).
* @stable ICU 2.4
*/
virtual UChar32 getChar32At(int32_t offset) const override;
private:
// For char* constructors. Could be made public.
UnicodeString &setToUTF8(StringPiece utf8);
// For extract(char*).
// We could make a toUTF8(target, capacity, errorCode) public but not
// this version: New API will be cleaner if we make callers create substrings
// rather than having start+length on every method,
// and it should take a UErrorCode&.
int32_t
toUTF8(int32_t start, int32_t len,
char *target, int32_t capacity) const;
/**
* Internal string contents comparison, called by operator==.
* Requires: this & text not bogus and have same lengths.
*/
UBool doEquals(const UnicodeString &text, int32_t len) const;
inline UBool
doEqualsSubstring(int32_t start,
int32_t length,
const UnicodeString& srcText,
int32_t srcStart,
int32_t srcLength) const;
UBool doEqualsSubstring(int32_t start,
int32_t length,
const char16_t *srcChars,
int32_t srcStart,
int32_t srcLength) const;
inline int8_t
doCompare(int32_t start,
int32_t length,
const UnicodeString& srcText,
int32_t srcStart,
int32_t srcLength) const;
int8_t doCompare(int32_t start,
int32_t length,
const char16_t *srcChars,
int32_t srcStart,
int32_t srcLength) const;
inline int8_t
doCompareCodePointOrder(int32_t start,
int32_t length,
const UnicodeString& srcText,
int32_t srcStart,
int32_t srcLength) const;
int8_t doCompareCodePointOrder(int32_t start,
int32_t length,
const char16_t *srcChars,
int32_t srcStart,
int32_t srcLength) const;
inline int8_t
doCaseCompare(int32_t start,
int32_t length,
const UnicodeString &srcText,
int32_t srcStart,
int32_t srcLength,
uint32_t options) const;
int8_t
doCaseCompare(int32_t start,
int32_t length,
const char16_t *srcChars,
int32_t srcStart,
int32_t srcLength,
uint32_t options) const;
int32_t doIndexOf(char16_t c,
int32_t start,
int32_t length) const;
int32_t doIndexOf(UChar32 c,
int32_t start,
int32_t length) const;
int32_t doLastIndexOf(char16_t c,
int32_t start,
int32_t length) const;
int32_t doLastIndexOf(UChar32 c,
int32_t start,
int32_t length) const;
void doExtract(int32_t start,
int32_t length,
char16_t *dst,
int32_t dstStart) const;
inline void doExtract(int32_t start,
int32_t length,
UnicodeString& target) const;
inline char16_t doCharAt(int32_t offset) const;
UnicodeString& doReplace(int32_t start,
int32_t length,
const UnicodeString& srcText,
int32_t srcStart,
int32_t srcLength);
UnicodeString& doReplace(int32_t start,
int32_t length,
const char16_t *srcChars,
int32_t srcStart,
int32_t srcLength);
UnicodeString& doAppend(const UnicodeString& src, int32_t srcStart, int32_t srcLength);
UnicodeString& doAppend(const char16_t *srcChars, int32_t srcStart, int32_t srcLength);
UnicodeString& doReverse(int32_t start,
int32_t length);
// calculate hash code
int32_t doHashCode() const;
// get pointer to start of array
// these do not check for kOpenGetBuffer, unlike the public getBuffer() function
inline char16_t* getArrayStart();
inline const char16_t* getArrayStart() const;
inline UBool hasShortLength() const;
inline int32_t getShortLength() const;
// A UnicodeString object (not necessarily its current buffer)
// is writable unless it isBogus() or it has an "open" getBuffer(minCapacity).
inline UBool isWritable() const;
// Is the current buffer writable?
inline UBool isBufferWritable() const;
// None of the following does releaseArray().
inline void setZeroLength();
inline void setShortLength(int32_t len);
inline void setLength(int32_t len);
inline void setToEmpty();
inline void setArray(char16_t *array, int32_t len, int32_t capacity); // sets length but not flags
// allocate the array; result may be the stack buffer
// sets refCount to 1 if appropriate
// sets fArray, fCapacity, and flags
// sets length to 0
// returns boolean for success or failure
UBool allocate(int32_t capacity);
// release the array if owned
void releaseArray();
// turn a bogus string into an empty one
void unBogus();
// implements assignment operator, copy constructor, and fastCopyFrom()
UnicodeString &copyFrom(const UnicodeString &src, UBool fastCopy=false);
// Copies just the fields without memory management.
void copyFieldsFrom(UnicodeString &src, UBool setSrcToBogus) noexcept;
// Pin start and limit to acceptable values.
inline void pinIndex(int32_t& start) const;
inline void pinIndices(int32_t& start,
int32_t& length) const;
#if !UCONFIG_NO_CONVERSION
/* Internal extract() using UConverter. */
int32_t doExtract(int32_t start, int32_t length,
char *dest, int32_t destCapacity,
UConverter *cnv,
UErrorCode &errorCode) const;
/*
* Real constructor for converting from codepage data.
* It assumes that it is called with !fRefCounted.
*
* If `codepage==0`, then the default converter
* is used for the platform encoding.
* If `codepage` is an empty string (`""`),
* then a simple conversion is performed on the codepage-invariant
* subset ("invariant characters") of the platform encoding. See utypes.h.
*/
void doCodepageCreate(const char *codepageData,
int32_t dataLength,
const char *codepage);
/*
* Worker function for creating a UnicodeString from
* a codepage string using a UConverter.
*/
void
doCodepageCreate(const char *codepageData,
int32_t dataLength,
UConverter *converter,
UErrorCode &status);
#endif
/*
* This function is called when write access to the array
* is necessary.
*
* We need to make a copy of the array if
* the buffer is read-only, or
* the buffer is refCounted (shared), and refCount>1, or
* the buffer is too small.
*
* Return false if memory could not be allocated.
*/
UBool cloneArrayIfNeeded(int32_t newCapacity = -1,
int32_t growCapacity = -1,
UBool doCopyArray = true,
int32_t** pBufferToDelete = nullptr,
UBool forceClone = false);
/**
* Common function for UnicodeString case mappings.
* The stringCaseMapper has the same type UStringCaseMapper
* as in ustr_imp.h for ustrcase_map().
*/
UnicodeString &
caseMap(int32_t caseLocale, uint32_t options,
#if !UCONFIG_NO_BREAK_ITERATION
BreakIterator *iter,
#endif
UStringCaseMapper *stringCaseMapper);
// ref counting
void addRef();
int32_t removeRef();
int32_t refCount() const;
// constants
enum {
/**
* Size of stack buffer for short strings.
* Must be at least U16_MAX_LENGTH for the single-code point constructor to work.
* @see UNISTR_OBJECT_SIZE
*/
US_STACKBUF_SIZE=(int32_t)(UNISTR_OBJECT_SIZE-sizeof(void *)-2)/U_SIZEOF_UCHAR,
kInvalidUChar=0xffff, // U+FFFF returned by charAt(invalid index)
kInvalidHashCode=0, // invalid hash code
kEmptyHashCode=1, // hash code for empty string
// bit flag values for fLengthAndFlags
kIsBogus=1, // this string is bogus, i.e., not valid or nullptr
kUsingStackBuffer=2,// using fUnion.fStackFields instead of fUnion.fFields
kRefCounted=4, // there is a refCount field before the characters in fArray
kBufferIsReadonly=8,// do not write to this buffer
kOpenGetBuffer=16, // getBuffer(minCapacity) was called (is "open"),
// and releaseBuffer(newLength) must be called
kAllStorageFlags=0x1f,
kLengthShift=5, // remaining 11 bits for non-negative short length, or negative if long
kLength1=1<<kLengthShift,
kMaxShortLength=0x3ff, // max non-negative short length (leaves top bit 0)
kLengthIsLarge=0xffe0, // short length < 0, real length is in fUnion.fFields.fLength
// combined values for convenience
kShortString=kUsingStackBuffer,
kLongString=kRefCounted,
kReadonlyAlias=kBufferIsReadonly,
kWritableAlias=0
};
friend class UnicodeStringAppendable;
union StackBufferOrFields; // forward declaration necessary before friend declaration
friend union StackBufferOrFields; // make US_STACKBUF_SIZE visible inside fUnion
/*
* The following are all the class fields that are stored
* in each UnicodeString object.
* Note that UnicodeString has virtual functions,
* therefore there is an implicit vtable pointer
* as the first real field.
* The fields should be aligned such that no padding is necessary.
* On 32-bit machines, the size should be 32 bytes,
* on 64-bit machines (8-byte pointers), it should be 40 bytes.
*
* We use a hack to achieve this.
*
* With at least some compilers, each of the following is forced to
* a multiple of sizeof(pointer) [the largest field base unit here is a data pointer],
* rounded up with additional padding if the fields do not already fit that requirement:
* - sizeof(class UnicodeString)
* - offsetof(UnicodeString, fUnion)
* - sizeof(fUnion)
* - sizeof(fStackFields)
*
* We optimize for the longest possible internal buffer for short strings.
* fUnion.fStackFields begins with 2 bytes for storage flags
* and the length of relatively short strings,
* followed by the buffer for short string contents.
* There is no padding inside fStackFields.
*
* Heap-allocated and aliased strings use fUnion.fFields.
* Both fStackFields and fFields must begin with the same fields for flags and short length,
* that is, those must have the same memory offsets inside the object,
* because the flags must be inspected in order to decide which half of fUnion is being used.
* We assume that the compiler does not reorder the fields.
*
* (Padding at the end of fFields is ok:
* As long as it is no larger than fStackFields, it is not wasted space.)
*
* For some of the history of the UnicodeString class fields layout, see
* - ICU ticket #11551 "longer UnicodeString contents in stack buffer"
* - ICU ticket #11336 "UnicodeString: recombine stack buffer arrays"
* - ICU ticket #8322 "why is sizeof(UnicodeString)==48?"
*/
// (implicit) *vtable;
union StackBufferOrFields {
// fStackFields is used iff (fLengthAndFlags&kUsingStackBuffer) else fFields is used.
// Each struct of the union must begin with fLengthAndFlags.
struct {
int16_t fLengthAndFlags; // bit fields: see constants above
char16_t fBuffer[US_STACKBUF_SIZE]; // buffer for short strings
} fStackFields;
struct {
int16_t fLengthAndFlags; // bit fields: see constants above
int32_t fLength; // number of characters in fArray if >127; else undefined
int32_t fCapacity; // capacity of fArray (in char16_ts)
// array pointer last to minimize padding for machines with P128 data model
// or pointer sizes that are not a power of 2
char16_t *fArray; // the Unicode data
} fFields;
} fUnion;
};
/**
* Create a new UnicodeString with the concatenation of two others.
*
* @param s1 The first string to be copied to the new one.
* @param s2 The second string to be copied to the new one, after s1.
* @return UnicodeString(s1).append(s2)
* @stable ICU 2.8
*/
U_COMMON_API UnicodeString U_EXPORT2
operator+ (const UnicodeString &s1, const UnicodeString &s2);
//========================================
// Inline members
//========================================
//========================================
// Privates
//========================================
inline void
UnicodeString::pinIndex(int32_t& start) const
{
// pin index
if(start < 0) {
start = 0;
} else if(start > length()) {
start = length();
}
}
inline void
UnicodeString::pinIndices(int32_t& start,
int32_t& _length) const
{
// pin indices
int32_t len = length();
if(start < 0) {
start = 0;
} else if(start > len) {
start = len;
}
if(_length < 0) {
_length = 0;
} else if(_length > (len - start)) {
_length = (len - start);
}
}
inline char16_t*
UnicodeString::getArrayStart() {
return (fUnion.fFields.fLengthAndFlags&kUsingStackBuffer) ?
fUnion.fStackFields.fBuffer : fUnion.fFields.fArray;
}
inline const char16_t*
UnicodeString::getArrayStart() const {
return (fUnion.fFields.fLengthAndFlags&kUsingStackBuffer) ?
fUnion.fStackFields.fBuffer : fUnion.fFields.fArray;
}
//========================================
// Default constructor
//========================================
inline
UnicodeString::UnicodeString() {
fUnion.fStackFields.fLengthAndFlags=kShortString;
}
inline UnicodeString::UnicodeString(const std::nullptr_t /*text*/) {
fUnion.fStackFields.fLengthAndFlags=kShortString;
}
inline UnicodeString::UnicodeString(const std::nullptr_t /*text*/, int32_t /*length*/) {
fUnion.fStackFields.fLengthAndFlags=kShortString;
}
inline UnicodeString::UnicodeString(std::nullptr_t /*buffer*/, int32_t /*buffLength*/, int32_t /*buffCapacity*/) {
fUnion.fStackFields.fLengthAndFlags=kShortString;
}
//========================================
// Read-only implementation methods
//========================================
inline UBool
UnicodeString::hasShortLength() const {
return fUnion.fFields.fLengthAndFlags>=0;
}
inline int32_t
UnicodeString::getShortLength() const {
// fLengthAndFlags must be non-negative -> short length >= 0
// and arithmetic or logical shift does not matter.
return fUnion.fFields.fLengthAndFlags>>kLengthShift;
}
inline int32_t
UnicodeString::length() const {
return hasShortLength() ? getShortLength() : fUnion.fFields.fLength;
}
inline int32_t
UnicodeString::getCapacity() const {
return (fUnion.fFields.fLengthAndFlags&kUsingStackBuffer) ?
US_STACKBUF_SIZE : fUnion.fFields.fCapacity;
}
inline int32_t
UnicodeString::hashCode() const
{ return doHashCode(); }
inline UBool
UnicodeString::isBogus() const
{ return (UBool)(fUnion.fFields.fLengthAndFlags & kIsBogus); }
inline UBool
UnicodeString::isWritable() const
{ return (UBool)!(fUnion.fFields.fLengthAndFlags&(kOpenGetBuffer|kIsBogus)); }
inline UBool
UnicodeString::isBufferWritable() const
{
return (UBool)(
!(fUnion.fFields.fLengthAndFlags&(kOpenGetBuffer|kIsBogus|kBufferIsReadonly)) &&
(!(fUnion.fFields.fLengthAndFlags&kRefCounted) || refCount()==1));
}
inline const char16_t *
UnicodeString::getBuffer() const {
if(fUnion.fFields.fLengthAndFlags&(kIsBogus|kOpenGetBuffer)) {
return nullptr;
} else if(fUnion.fFields.fLengthAndFlags&kUsingStackBuffer) {
return fUnion.fStackFields.fBuffer;
} else {
return fUnion.fFields.fArray;
}
}
//========================================
// Read-only alias methods
//========================================
inline int8_t
UnicodeString::doCompare(int32_t start,
int32_t thisLength,
const UnicodeString& srcText,
int32_t srcStart,
int32_t srcLength) const
{
if(srcText.isBogus()) {
return (int8_t)!isBogus(); // 0 if both are bogus, 1 otherwise
} else {
srcText.pinIndices(srcStart, srcLength);
return doCompare(start, thisLength, srcText.getArrayStart(), srcStart, srcLength);
}
}
inline UBool
UnicodeString::doEqualsSubstring(int32_t start,
int32_t thisLength,
const UnicodeString& srcText,
int32_t srcStart,
int32_t srcLength) const
{
if(srcText.isBogus()) {
return isBogus();
} else {
srcText.pinIndices(srcStart, srcLength);
return !isBogus() && doEqualsSubstring(start, thisLength, srcText.getArrayStart(), srcStart, srcLength);
}
}
inline bool
UnicodeString::operator== (const UnicodeString& text) const
{
if(isBogus()) {
return text.isBogus();
} else {
int32_t len = length(), textLength = text.length();
return !text.isBogus() && len == textLength && doEquals(text, len);
}
}
inline bool
UnicodeString::operator!= (const UnicodeString& text) const
{ return (! operator==(text)); }
inline UBool
UnicodeString::operator> (const UnicodeString& text) const
{ return doCompare(0, length(), text, 0, text.length()) == 1; }
inline UBool
UnicodeString::operator< (const UnicodeString& text) const
{ return doCompare(0, length(), text, 0, text.length()) == -1; }
inline UBool
UnicodeString::operator>= (const UnicodeString& text) const
{ return doCompare(0, length(), text, 0, text.length()) != -1; }
inline UBool
UnicodeString::operator<= (const UnicodeString& text) const
{ return doCompare(0, length(), text, 0, text.length()) != 1; }
inline int8_t
UnicodeString::compare(const UnicodeString& text) const
{ return doCompare(0, length(), text, 0, text.length()); }
inline int8_t
UnicodeString::compare(int32_t start,
int32_t _length,
const UnicodeString& srcText) const
{ return doCompare(start, _length, srcText, 0, srcText.length()); }
inline int8_t
UnicodeString::compare(ConstChar16Ptr srcChars,
int32_t srcLength) const
{ return doCompare(0, length(), srcChars, 0, srcLength); }
inline int8_t
UnicodeString::compare(int32_t start,
int32_t _length,
const UnicodeString& srcText,
int32_t srcStart,
int32_t srcLength) const
{ return doCompare(start, _length, srcText, srcStart, srcLength); }
inline int8_t
UnicodeString::compare(int32_t start,
int32_t _length,
const char16_t *srcChars) const
{ return doCompare(start, _length, srcChars, 0, _length); }
inline int8_t
UnicodeString::compare(int32_t start,
int32_t _length,
const char16_t *srcChars,
int32_t srcStart,
int32_t srcLength) const
{ return doCompare(start, _length, srcChars, srcStart, srcLength); }
inline int8_t
UnicodeString::compareBetween(int32_t start,
int32_t limit,
const UnicodeString& srcText,
int32_t srcStart,
int32_t srcLimit) const
{ return doCompare(start, limit - start,
srcText, srcStart, srcLimit - srcStart); }
inline int8_t
UnicodeString::doCompareCodePointOrder(int32_t start,
int32_t thisLength,
const UnicodeString& srcText,
int32_t srcStart,
int32_t srcLength) const
{
if(srcText.isBogus()) {
return (int8_t)!isBogus(); // 0 if both are bogus, 1 otherwise
} else {
srcText.pinIndices(srcStart, srcLength);
return doCompareCodePointOrder(start, thisLength, srcText.getArrayStart(), srcStart, srcLength);
}
}
inline int8_t
UnicodeString::compareCodePointOrder(const UnicodeString& text) const
{ return doCompareCodePointOrder(0, length(), text, 0, text.length()); }
inline int8_t
UnicodeString::compareCodePointOrder(int32_t start,
int32_t _length,
const UnicodeString& srcText) const
{ return doCompareCodePointOrder(start, _length, srcText, 0, srcText.length()); }
inline int8_t
UnicodeString::compareCodePointOrder(ConstChar16Ptr srcChars,
int32_t srcLength) const
{ return doCompareCodePointOrder(0, length(), srcChars, 0, srcLength); }
inline int8_t
UnicodeString::compareCodePointOrder(int32_t start,
int32_t _length,
const UnicodeString& srcText,
int32_t srcStart,
int32_t srcLength) const
{ return doCompareCodePointOrder(start, _length, srcText, srcStart, srcLength); }
inline int8_t
UnicodeString::compareCodePointOrder(int32_t start,
int32_t _length,
const char16_t *srcChars) const
{ return doCompareCodePointOrder(start, _length, srcChars, 0, _length); }
inline int8_t
UnicodeString::compareCodePointOrder(int32_t start,
int32_t _length,
const char16_t *srcChars,
int32_t srcStart,
int32_t srcLength) const
{ return doCompareCodePointOrder(start, _length, srcChars, srcStart, srcLength); }
inline int8_t
UnicodeString::compareCodePointOrderBetween(int32_t start,
int32_t limit,
const UnicodeString& srcText,
int32_t srcStart,
int32_t srcLimit) const
{ return doCompareCodePointOrder(start, limit - start,
srcText, srcStart, srcLimit - srcStart); }
inline int8_t
UnicodeString::doCaseCompare(int32_t start,
int32_t thisLength,
const UnicodeString &srcText,
int32_t srcStart,
int32_t srcLength,
uint32_t options) const
{
if(srcText.isBogus()) {
return (int8_t)!isBogus(); // 0 if both are bogus, 1 otherwise
} else {
srcText.pinIndices(srcStart, srcLength);
return doCaseCompare(start, thisLength, srcText.getArrayStart(), srcStart, srcLength, options);
}
}
inline int8_t
UnicodeString::caseCompare(const UnicodeString &text, uint32_t options) const {
return doCaseCompare(0, length(), text, 0, text.length(), options);
}
inline int8_t
UnicodeString::caseCompare(int32_t start,
int32_t _length,
const UnicodeString &srcText,
uint32_t options) const {
return doCaseCompare(start, _length, srcText, 0, srcText.length(), options);
}
inline int8_t
UnicodeString::caseCompare(ConstChar16Ptr srcChars,
int32_t srcLength,
uint32_t options) const {
return doCaseCompare(0, length(), srcChars, 0, srcLength, options);
}
inline int8_t
UnicodeString::caseCompare(int32_t start,
int32_t _length,
const UnicodeString &srcText,
int32_t srcStart,
int32_t srcLength,
uint32_t options) const {
return doCaseCompare(start, _length, srcText, srcStart, srcLength, options);
}
inline int8_t
UnicodeString::caseCompare(int32_t start,
int32_t _length,
const char16_t *srcChars,
uint32_t options) const {
return doCaseCompare(start, _length, srcChars, 0, _length, options);
}
inline int8_t
UnicodeString::caseCompare(int32_t start,
int32_t _length,
const char16_t *srcChars,
int32_t srcStart,
int32_t srcLength,
uint32_t options) const {
return doCaseCompare(start, _length, srcChars, srcStart, srcLength, options);
}
inline int8_t
UnicodeString::caseCompareBetween(int32_t start,
int32_t limit,
const UnicodeString &srcText,
int32_t srcStart,
int32_t srcLimit,
uint32_t options) const {
return doCaseCompare(start, limit - start, srcText, srcStart, srcLimit - srcStart, options);
}
inline int32_t
UnicodeString::indexOf(const UnicodeString& srcText,
int32_t srcStart,
int32_t srcLength,
int32_t start,
int32_t _length) const
{
if(!srcText.isBogus()) {
srcText.pinIndices(srcStart, srcLength);
if(srcLength > 0) {
return indexOf(srcText.getArrayStart(), srcStart, srcLength, start, _length);
}
}
return -1;
}
inline int32_t
UnicodeString::indexOf(const UnicodeString& text) const
{ return indexOf(text, 0, text.length(), 0, length()); }
inline int32_t
UnicodeString::indexOf(const UnicodeString& text,
int32_t start) const {
pinIndex(start);
return indexOf(text, 0, text.length(), start, length() - start);
}
inline int32_t
UnicodeString::indexOf(const UnicodeString& text,
int32_t start,
int32_t _length) const
{ return indexOf(text, 0, text.length(), start, _length); }
inline int32_t
UnicodeString::indexOf(const char16_t *srcChars,
int32_t srcLength,
int32_t start) const {
pinIndex(start);
return indexOf(srcChars, 0, srcLength, start, length() - start);
}
inline int32_t
UnicodeString::indexOf(ConstChar16Ptr srcChars,
int32_t srcLength,
int32_t start,
int32_t _length) const
{ return indexOf(srcChars, 0, srcLength, start, _length); }
inline int32_t
UnicodeString::indexOf(char16_t c,
int32_t start,
int32_t _length) const
{ return doIndexOf(c, start, _length); }
inline int32_t
UnicodeString::indexOf(UChar32 c,
int32_t start,
int32_t _length) const
{ return doIndexOf(c, start, _length); }
inline int32_t
UnicodeString::indexOf(char16_t c) const
{ return doIndexOf(c, 0, length()); }
inline int32_t
UnicodeString::indexOf(UChar32 c) const
{ return indexOf(c, 0, length()); }
inline int32_t
UnicodeString::indexOf(char16_t c,
int32_t start) const {
pinIndex(start);
return doIndexOf(c, start, length() - start);
}
inline int32_t
UnicodeString::indexOf(UChar32 c,
int32_t start) const {
pinIndex(start);
return indexOf(c, start, length() - start);
}
inline int32_t
UnicodeString::lastIndexOf(ConstChar16Ptr srcChars,
int32_t srcLength,
int32_t start,
int32_t _length) const
{ return lastIndexOf(srcChars, 0, srcLength, start, _length); }
inline int32_t
UnicodeString::lastIndexOf(const char16_t *srcChars,
int32_t srcLength,
int32_t start) const {
pinIndex(start);
return lastIndexOf(srcChars, 0, srcLength, start, length() - start);
}
inline int32_t
UnicodeString::lastIndexOf(const UnicodeString& srcText,
int32_t srcStart,
int32_t srcLength,
int32_t start,
int32_t _length) const
{
if(!srcText.isBogus()) {
srcText.pinIndices(srcStart, srcLength);
if(srcLength > 0) {
return lastIndexOf(srcText.getArrayStart(), srcStart, srcLength, start, _length);
}
}
return -1;
}
inline int32_t
UnicodeString::lastIndexOf(const UnicodeString& text,
int32_t start,
int32_t _length) const
{ return lastIndexOf(text, 0, text.length(), start, _length); }
inline int32_t
UnicodeString::lastIndexOf(const UnicodeString& text,
int32_t start) const {
pinIndex(start);
return lastIndexOf(text, 0, text.length(), start, length() - start);
}
inline int32_t
UnicodeString::lastIndexOf(const UnicodeString& text) const
{ return lastIndexOf(text, 0, text.length(), 0, length()); }
inline int32_t
UnicodeString::lastIndexOf(char16_t c,
int32_t start,
int32_t _length) const
{ return doLastIndexOf(c, start, _length); }
inline int32_t
UnicodeString::lastIndexOf(UChar32 c,
int32_t start,
int32_t _length) const {
return doLastIndexOf(c, start, _length);
}
inline int32_t
UnicodeString::lastIndexOf(char16_t c) const
{ return doLastIndexOf(c, 0, length()); }
inline int32_t
UnicodeString::lastIndexOf(UChar32 c) const {
return lastIndexOf(c, 0, length());
}
inline int32_t
UnicodeString::lastIndexOf(char16_t c,
int32_t start) const {
pinIndex(start);
return doLastIndexOf(c, start, length() - start);
}
inline int32_t
UnicodeString::lastIndexOf(UChar32 c,
int32_t start) const {
pinIndex(start);
return lastIndexOf(c, start, length() - start);
}
inline UBool
UnicodeString::startsWith(const UnicodeString& text) const
{ return doEqualsSubstring(0, text.length(), text, 0, text.length()); }
inline UBool
UnicodeString::startsWith(const UnicodeString& srcText,
int32_t srcStart,
int32_t srcLength) const
{ return doEqualsSubstring(0, srcLength, srcText, srcStart, srcLength); }
inline UBool
UnicodeString::startsWith(ConstChar16Ptr srcChars, int32_t srcLength) const {
if(srcLength < 0) {
srcLength = u_strlen(toUCharPtr(srcChars));
}
return doEqualsSubstring(0, srcLength, srcChars, 0, srcLength);
}
inline UBool
UnicodeString::startsWith(const char16_t *srcChars, int32_t srcStart, int32_t srcLength) const {
if(srcLength < 0) {
srcLength = u_strlen(toUCharPtr(srcChars));
}
return doEqualsSubstring(0, srcLength, srcChars, srcStart, srcLength);
}
inline UBool
UnicodeString::endsWith(const UnicodeString& text) const
{ return doEqualsSubstring(length() - text.length(), text.length(),
text, 0, text.length()); }
inline UBool
UnicodeString::endsWith(const UnicodeString& srcText,
int32_t srcStart,
int32_t srcLength) const {
srcText.pinIndices(srcStart, srcLength);
return doEqualsSubstring(length() - srcLength, srcLength,
srcText, srcStart, srcLength);
}
inline UBool
UnicodeString::endsWith(ConstChar16Ptr srcChars,
int32_t srcLength) const {
if(srcLength < 0) {
srcLength = u_strlen(toUCharPtr(srcChars));
}
return doEqualsSubstring(length() - srcLength, srcLength, srcChars, 0, srcLength);
}
inline UBool
UnicodeString::endsWith(const char16_t *srcChars,
int32_t srcStart,
int32_t srcLength) const {
if(srcLength < 0) {
srcLength = u_strlen(toUCharPtr(srcChars + srcStart));
}
return doEqualsSubstring(length() - srcLength, srcLength,
srcChars, srcStart, srcLength);
}
//========================================
// replace
//========================================
inline UnicodeString&
UnicodeString::replace(int32_t start,
int32_t _length,
const UnicodeString& srcText)
{ return doReplace(start, _length, srcText, 0, srcText.length()); }
inline UnicodeString&
UnicodeString::replace(int32_t start,
int32_t _length,
const UnicodeString& srcText,
int32_t srcStart,
int32_t srcLength)
{ return doReplace(start, _length, srcText, srcStart, srcLength); }
inline UnicodeString&
UnicodeString::replace(int32_t start,
int32_t _length,
ConstChar16Ptr srcChars,
int32_t srcLength)
{ return doReplace(start, _length, srcChars, 0, srcLength); }
inline UnicodeString&
UnicodeString::replace(int32_t start,
int32_t _length,
const char16_t *srcChars,
int32_t srcStart,
int32_t srcLength)
{ return doReplace(start, _length, srcChars, srcStart, srcLength); }
inline UnicodeString&
UnicodeString::replace(int32_t start,
int32_t _length,
char16_t srcChar)
{ return doReplace(start, _length, &srcChar, 0, 1); }
inline UnicodeString&
UnicodeString::replaceBetween(int32_t start,
int32_t limit,
const UnicodeString& srcText)
{ return doReplace(start, limit - start, srcText, 0, srcText.length()); }
inline UnicodeString&
UnicodeString::replaceBetween(int32_t start,
int32_t limit,
const UnicodeString& srcText,
int32_t srcStart,
int32_t srcLimit)
{ return doReplace(start, limit - start, srcText, srcStart, srcLimit - srcStart); }
inline UnicodeString&
UnicodeString::findAndReplace(const UnicodeString& oldText,
const UnicodeString& newText)
{ return findAndReplace(0, length(), oldText, 0, oldText.length(),
newText, 0, newText.length()); }
inline UnicodeString&
UnicodeString::findAndReplace(int32_t start,
int32_t _length,
const UnicodeString& oldText,
const UnicodeString& newText)
{ return findAndReplace(start, _length, oldText, 0, oldText.length(),
newText, 0, newText.length()); }
// ============================
// extract
// ============================
inline void
UnicodeString::doExtract(int32_t start,
int32_t _length,
UnicodeString& target) const
{ target.replace(0, target.length(), *this, start, _length); }
inline void
UnicodeString::extract(int32_t start,
int32_t _length,
Char16Ptr target,
int32_t targetStart) const
{ doExtract(start, _length, target, targetStart); }
inline void
UnicodeString::extract(int32_t start,
int32_t _length,
UnicodeString& target) const
{ doExtract(start, _length, target); }
#if !UCONFIG_NO_CONVERSION
inline int32_t
UnicodeString::extract(int32_t start,
int32_t _length,
char *dst,
const char *codepage) const
{
// This dstSize value will be checked explicitly
return extract(start, _length, dst, dst != nullptr ? 0xffffffff : 0, codepage);
}
#endif
inline void
UnicodeString::extractBetween(int32_t start,
int32_t limit,
char16_t *dst,
int32_t dstStart) const {
pinIndex(start);
pinIndex(limit);
doExtract(start, limit - start, dst, dstStart);
}
inline UnicodeString
UnicodeString::tempSubStringBetween(int32_t start, int32_t limit) const {
return tempSubString(start, limit - start);
}
inline char16_t
UnicodeString::doCharAt(int32_t offset) const
{
if((uint32_t)offset < (uint32_t)length()) {
return getArrayStart()[offset];
} else {
return kInvalidUChar;
}
}
inline char16_t
UnicodeString::charAt(int32_t offset) const
{ return doCharAt(offset); }
inline char16_t
UnicodeString::operator[] (int32_t offset) const
{ return doCharAt(offset); }
inline UBool
UnicodeString::isEmpty() const {
// Arithmetic or logical right shift does not matter: only testing for 0.
return (fUnion.fFields.fLengthAndFlags>>kLengthShift) == 0;
}
//========================================
// Write implementation methods
//========================================
inline void
UnicodeString::setZeroLength() {
fUnion.fFields.fLengthAndFlags &= kAllStorageFlags;
}
inline void
UnicodeString::setShortLength(int32_t len) {
// requires 0 <= len <= kMaxShortLength
fUnion.fFields.fLengthAndFlags =
(int16_t)((fUnion.fFields.fLengthAndFlags & kAllStorageFlags) | (len << kLengthShift));
}
inline void
UnicodeString::setLength(int32_t len) {
if(len <= kMaxShortLength) {
setShortLength(len);
} else {
fUnion.fFields.fLengthAndFlags |= kLengthIsLarge;
fUnion.fFields.fLength = len;
}
}
inline void
UnicodeString::setToEmpty() {
fUnion.fFields.fLengthAndFlags = kShortString;
}
inline void
UnicodeString::setArray(char16_t *array, int32_t len, int32_t capacity) {
setLength(len);
fUnion.fFields.fArray = array;
fUnion.fFields.fCapacity = capacity;
}
inline UnicodeString&
UnicodeString::operator= (char16_t ch)
{ return doReplace(0, length(), &ch, 0, 1); }
inline UnicodeString&
UnicodeString::operator= (UChar32 ch)
{ return replace(0, length(), ch); }
inline UnicodeString&
UnicodeString::setTo(const UnicodeString& srcText,
int32_t srcStart,
int32_t srcLength)
{
unBogus();
return doReplace(0, length(), srcText, srcStart, srcLength);
}
inline UnicodeString&
UnicodeString::setTo(const UnicodeString& srcText,
int32_t srcStart)
{
unBogus();
srcText.pinIndex(srcStart);
return doReplace(0, length(), srcText, srcStart, srcText.length() - srcStart);
}
inline UnicodeString&
UnicodeString::setTo(const UnicodeString& srcText)
{
return copyFrom(srcText);
}
inline UnicodeString&
UnicodeString::setTo(const char16_t *srcChars,
int32_t srcLength)
{
unBogus();
return doReplace(0, length(), srcChars, 0, srcLength);
}
inline UnicodeString&
UnicodeString::setTo(char16_t srcChar)
{
unBogus();
return doReplace(0, length(), &srcChar, 0, 1);
}
inline UnicodeString&
UnicodeString::setTo(UChar32 srcChar)
{
unBogus();
return replace(0, length(), srcChar);
}
inline UnicodeString&
UnicodeString::append(const UnicodeString& srcText,
int32_t srcStart,
int32_t srcLength)
{ return doAppend(srcText, srcStart, srcLength); }
inline UnicodeString&
UnicodeString::append(const UnicodeString& srcText)
{ return doAppend(srcText, 0, srcText.length()); }
inline UnicodeString&
UnicodeString::append(const char16_t *srcChars,
int32_t srcStart,
int32_t srcLength)
{ return doAppend(srcChars, srcStart, srcLength); }
inline UnicodeString&
UnicodeString::append(ConstChar16Ptr srcChars,
int32_t srcLength)
{ return doAppend(srcChars, 0, srcLength); }
inline UnicodeString&
UnicodeString::append(char16_t srcChar)
{ return doAppend(&srcChar, 0, 1); }
inline UnicodeString&
UnicodeString::operator+= (char16_t ch)
{ return doAppend(&ch, 0, 1); }
inline UnicodeString&
UnicodeString::operator+= (UChar32 ch) {
return append(ch);
}
inline UnicodeString&
UnicodeString::operator+= (const UnicodeString& srcText)
{ return doAppend(srcText, 0, srcText.length()); }
inline UnicodeString&
UnicodeString::insert(int32_t start,
const UnicodeString& srcText,
int32_t srcStart,
int32_t srcLength)
{ return doReplace(start, 0, srcText, srcStart, srcLength); }
inline UnicodeString&
UnicodeString::insert(int32_t start,
const UnicodeString& srcText)
{ return doReplace(start, 0, srcText, 0, srcText.length()); }
inline UnicodeString&
UnicodeString::insert(int32_t start,
const char16_t *srcChars,
int32_t srcStart,
int32_t srcLength)
{ return doReplace(start, 0, srcChars, srcStart, srcLength); }
inline UnicodeString&
UnicodeString::insert(int32_t start,
ConstChar16Ptr srcChars,
int32_t srcLength)
{ return doReplace(start, 0, srcChars, 0, srcLength); }
inline UnicodeString&
UnicodeString::insert(int32_t start,
char16_t srcChar)
{ return doReplace(start, 0, &srcChar, 0, 1); }
inline UnicodeString&
UnicodeString::insert(int32_t start,
UChar32 srcChar)
{ return replace(start, 0, srcChar); }
inline UnicodeString&
UnicodeString::remove()
{
// remove() of a bogus string makes the string empty and non-bogus
if(isBogus()) {
setToEmpty();
} else {
setZeroLength();
}
return *this;
}
inline UnicodeString&
UnicodeString::remove(int32_t start,
int32_t _length)
{
if(start <= 0 && _length == INT32_MAX) {
// remove(guaranteed everything) of a bogus string makes the string empty and non-bogus
return remove();
}
return doReplace(start, _length, nullptr, 0, 0);
}
inline UnicodeString&
UnicodeString::removeBetween(int32_t start,
int32_t limit)
{ return doReplace(start, limit - start, nullptr, 0, 0); }
inline UnicodeString &
UnicodeString::retainBetween(int32_t start, int32_t limit) {
truncate(limit);
return doReplace(0, start, nullptr, 0, 0);
}
inline UBool
UnicodeString::truncate(int32_t targetLength)
{
if(isBogus() && targetLength == 0) {
// truncate(0) of a bogus string makes the string empty and non-bogus
unBogus();
return false;
} else if((uint32_t)targetLength < (uint32_t)length()) {
setLength(targetLength);
return true;
} else {
return false;
}
}
inline UnicodeString&
UnicodeString::reverse()
{ return doReverse(0, length()); }
inline UnicodeString&
UnicodeString::reverse(int32_t start,
int32_t _length)
{ return doReverse(start, _length); }
U_NAMESPACE_END
#endif /* U_SHOW_CPLUSPLUS_API */
#endif
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