124 lines
4.6 KiB
C++
124 lines
4.6 KiB
C++
/*
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**********************************************************************
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* Copyright (c) 2001-2010, International Business Machines
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* Corporation and others. All Rights Reserved.
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**********************************************************************
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* Date Name Description
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* 11/19/2001 aliu Creation.
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* 05/19/2010 markus Rewritten from scratch
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**********************************************************************
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*/
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#ifndef CHARSTRING_H
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#define CHARSTRING_H
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#include "unicode/utypes.h"
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#include "unicode/unistr.h"
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#include "unicode/uobject.h"
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#include "cmemory.h"
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U_NAMESPACE_BEGIN
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// Windows needs us to DLL-export the MaybeStackArray template specialization,
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// but MacOS X cannot handle it. Same as in digitlst.h.
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#if !defined(U_DARWIN)
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template class U_COMMON_API MaybeStackArray<char, 40>;
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#endif
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/**
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* ICU-internal char * string class.
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* This class does not assume or enforce any particular character encoding.
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* Raw bytes can be stored. The string object owns its characters.
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* A terminating NUL is stored, but the class does not prevent embedded NUL characters.
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*
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* This class wants to be convenient but is also deliberately minimalist.
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* Please do not add methods if they only add minor convenience.
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* For example:
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* cs.data()[5]='a'; // no need for setCharAt(5, 'a')
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*/
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class U_COMMON_API CharString : public UMemory {
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public:
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CharString() : len(0) { buffer[0]=0; }
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CharString(const StringPiece &s, UErrorCode &errorCode) : len(0) {
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buffer[0]=0;
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append(s, errorCode);
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}
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CharString(const CharString &s, UErrorCode &errorCode) : len(0) {
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buffer[0]=0;
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append(s, errorCode);
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}
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CharString(const char *s, int32_t sLength, UErrorCode &errorCode) : len(0) {
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buffer[0]=0;
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append(s, sLength, errorCode);
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}
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~CharString() {}
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/**
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* Replaces this string's contents with the other string's contents.
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* CharString does not support the standard copy constructor nor
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* the assignment operator, to make copies explicit and to
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* use a UErrorCode where memory allocations might be needed.
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*/
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CharString ©From(const CharString &other, UErrorCode &errorCode);
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UBool isEmpty() { return len==0; }
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int32_t length() const { return len; }
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char operator[] (int32_t index) const { return buffer[index]; }
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StringPiece toStringPiece() const { return StringPiece(buffer.getAlias(), len); }
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const char *data() const { return buffer.getAlias(); }
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char *data() { return buffer.getAlias(); }
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CharString &clear() { len=0; buffer[0]=0; return *this; }
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CharString &truncate(int32_t newLength);
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CharString &append(char c, UErrorCode &errorCode);
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CharString &append(const StringPiece &s, UErrorCode &errorCode) {
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return append(s.data(), s.length(), errorCode);
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}
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CharString &append(const CharString &s, UErrorCode &errorCode) {
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return append(s.data(), s.length(), errorCode);
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}
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CharString &append(const char *s, int32_t sLength, UErrorCode &status);
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/**
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* Returns a writable buffer for appending and writes the buffer's capacity to
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* resultCapacity. Guarantees resultCapacity>=minCapacity if U_SUCCESS().
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* There will additionally be space for a terminating NUL right at resultCapacity.
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* (This function is similar to ByteSink.GetAppendBuffer().)
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*
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* The returned buffer is only valid until the next write operation
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* on this string.
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*
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* After writing at most resultCapacity bytes, call append() with the
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* pointer returned from this function and the number of bytes written.
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*
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* @param minCapacity required minimum capacity of the returned buffer;
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* must be non-negative
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* @param desiredCapacityHint desired capacity of the returned buffer;
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* must be non-negative
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* @param resultCapacity will be set to the capacity of the returned buffer
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* @param errorCode in/out error code
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* @return a buffer with resultCapacity>=min_capacity
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*/
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char *getAppendBuffer(int32_t minCapacity,
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int32_t desiredCapacityHint,
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int32_t &resultCapacity,
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UErrorCode &errorCode);
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CharString &appendInvariantChars(const UnicodeString &s, UErrorCode &errorCode);
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private:
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MaybeStackArray<char, 40> buffer;
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int32_t len;
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UBool ensureCapacity(int32_t capacity, int32_t desiredCapacityHint, UErrorCode &errorCode);
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CharString(const CharString &other); // forbid copying of this class
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CharString &operator=(const CharString &other); // forbid copying of this class
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};
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U_NAMESPACE_END
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#endif
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//eof
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