1 /* 2 ********************************************************************** 3 * Copyright (c) 2001-2012, International Business Machines 4 * Corporation and others. All Rights Reserved. 5 ********************************************************************** 6 * Date Name Description 7 * 11/19/2001 aliu Creation. 8 * 05/19/2010 markus Rewritten from scratch 9 ********************************************************************** 10 */ 11 12 #ifndef CHARSTRING_H 13 #define CHARSTRING_H 14 15 #include "unicode/utypes.h" 16 #include "unicode/unistr.h" 17 #include "unicode/uobject.h" 18 #include "cmemory.h" 19 20 U_NAMESPACE_BEGIN 21 22 // Windows needs us to DLL-export the MaybeStackArray template specialization, 23 // but MacOS X cannot handle it. Same as in digitlst.h. 24 #if !U_PLATFORM_IS_DARWIN_BASED 25 template class U_COMMON_API MaybeStackArray<char, 40>; 26 #endif 27 28 /** 29 * ICU-internal char * string class. 30 * This class does not assume or enforce any particular character encoding. 31 * Raw bytes can be stored. The string object owns its characters. 32 * A terminating NUL is stored, but the class does not prevent embedded NUL characters. 33 * 34 * This class wants to be convenient but is also deliberately minimalist. 35 * Please do not add methods if they only add minor convenience. 36 * For example: 37 * cs.data()[5]='a'; // no need for setCharAt(5, 'a') 38 */ 39 class U_COMMON_API CharString : public UMemory { 40 public: 41 CharString() : len(0) { buffer[0]=0; } 42 CharString(const StringPiece &s, UErrorCode &errorCode) : len(0) { 43 buffer[0]=0; 44 append(s, errorCode); 45 } 46 CharString(const CharString &s, UErrorCode &errorCode) : len(0) { 47 buffer[0]=0; 48 append(s, errorCode); 49 } 50 CharString(const char *s, int32_t sLength, UErrorCode &errorCode) : len(0) { 51 buffer[0]=0; 52 append(s, sLength, errorCode); 53 } 54 ~CharString() {} 55 56 /** 57 * Replaces this string's contents with the other string's contents. 58 * CharString does not support the standard copy constructor nor 59 * the assignment operator, to make copies explicit and to 60 * use a UErrorCode where memory allocations might be needed. 61 */ 62 CharString ©From(const CharString &other, UErrorCode &errorCode); 63 64 UBool isEmpty() const { return len==0; } 65 int32_t length() const { return len; } 66 char operator[](int32_t index) const { return buffer[index]; } 67 StringPiece toStringPiece() const { return StringPiece(buffer.getAlias(), len); } 68 69 const char *data() const { return buffer.getAlias(); } 70 char *data() { return buffer.getAlias(); } 71 72 CharString &clear() { len=0; buffer[0]=0; return *this; } 73 CharString &truncate(int32_t newLength); 74 75 CharString &append(char c, UErrorCode &errorCode); 76 CharString &append(const StringPiece &s, UErrorCode &errorCode) { 77 return append(s.data(), s.length(), errorCode); 78 } 79 CharString &append(const CharString &s, UErrorCode &errorCode) { 80 return append(s.data(), s.length(), errorCode); 81 } 82 CharString &append(const char *s, int32_t sLength, UErrorCode &status); 83 /** 84 * Returns a writable buffer for appending and writes the buffer's capacity to 85 * resultCapacity. Guarantees resultCapacity>=minCapacity if U_SUCCESS(). 86 * There will additionally be space for a terminating NUL right at resultCapacity. 87 * (This function is similar to ByteSink.GetAppendBuffer().) 88 * 89 * The returned buffer is only valid until the next write operation 90 * on this string. 91 * 92 * After writing at most resultCapacity bytes, call append() with the 93 * pointer returned from this function and the number of bytes written. 94 * 95 * @param minCapacity required minimum capacity of the returned buffer; 96 * must be non-negative 97 * @param desiredCapacityHint desired capacity of the returned buffer; 98 * must be non-negative 99 * @param resultCapacity will be set to the capacity of the returned buffer 100 * @param errorCode in/out error code 101 * @return a buffer with resultCapacity>=min_capacity 102 */ 103 char *getAppendBuffer(int32_t minCapacity, 104 int32_t desiredCapacityHint, 105 int32_t &resultCapacity, 106 UErrorCode &errorCode); 107 108 CharString &appendInvariantChars(const UnicodeString &s, UErrorCode &errorCode); 109 110 /** 111 * Appends a filename/path part, e.g., a directory name. 112 * First appends a U_FILE_SEP_CHAR if necessary. 113 * Does nothing if s is empty. 114 */ 115 CharString &appendPathPart(const StringPiece &s, UErrorCode &errorCode); 116 117 private: 118 MaybeStackArray<char, 40> buffer; 119 int32_t len; 120 121 UBool ensureCapacity(int32_t capacity, int32_t desiredCapacityHint, UErrorCode &errorCode); 122 123 CharString(const CharString &other); // forbid copying of this class 124 CharString &operator=(const CharString &other); // forbid copying of this class 125 }; 126 127 U_NAMESPACE_END 128 129 #endif 130 //eof 131
