1 2 /* 3 * Copyright 2006 The Android Open Source Project 4 * 5 * Use of this source code is governed by a BSD-style license that can be 6 * found in the LICENSE file. 7 */ 8 9 10 #ifndef SkString_DEFINED 11 #define SkString_DEFINED 12 13 #include "SkScalar.h" 14 #include "SkTArray.h" 15 16 #include <stdarg.h> 17 18 /* Some helper functions for C strings 19 */ 20 21 static bool SkStrStartsWith(const char string[], const char prefixStr[]) { 22 SkASSERT(string); 23 SkASSERT(prefixStr); 24 return !strncmp(string, prefixStr, strlen(prefixStr)); 25 } 26 static bool SkStrStartsWith(const char string[], const char prefixChar) { 27 SkASSERT(string); 28 return (prefixChar == *string); 29 } 30 31 bool SkStrEndsWith(const char string[], const char suffixStr[]); 32 bool SkStrEndsWith(const char string[], const char suffixChar); 33 34 int SkStrStartsWithOneOf(const char string[], const char prefixes[]); 35 36 static int SkStrFind(const char string[], const char substring[]) { 37 const char *first = strstr(string, substring); 38 if (NULL == first) return -1; 39 return SkToS32(first - &string[0]); 40 } 41 42 static bool SkStrContains(const char string[], const char substring[]) { 43 SkASSERT(string); 44 SkASSERT(substring); 45 return (-1 != SkStrFind(string, substring)); 46 } 47 static bool SkStrContains(const char string[], const char subchar) { 48 SkASSERT(string); 49 char tmp[2]; 50 tmp[0] = subchar; 51 tmp[1] = '\0'; 52 return (-1 != SkStrFind(string, tmp)); 53 } 54 55 static inline char *SkStrDup(const char string[]) { 56 char *ret = (char *) sk_malloc_throw(strlen(string)+1); 57 memcpy(ret,string,strlen(string)+1); 58 return ret; 59 } 60 61 62 63 #define SkStrAppendU32_MaxSize 10 64 char* SkStrAppendU32(char buffer[], uint32_t); 65 #define SkStrAppendU64_MaxSize 20 66 char* SkStrAppendU64(char buffer[], uint64_t, int minDigits); 67 68 #define SkStrAppendS32_MaxSize (SkStrAppendU32_MaxSize + 1) 69 char* SkStrAppendS32(char buffer[], int32_t); 70 #define SkStrAppendS64_MaxSize (SkStrAppendU64_MaxSize + 1) 71 char* SkStrAppendS64(char buffer[], int64_t, int minDigits); 72 73 /** 74 * Floats have at most 8 significant digits, so we limit our %g to that. 75 * However, the total string could be 15 characters: -1.2345678e-005 76 * 77 * In theory we should only expect up to 2 digits for the exponent, but on 78 * some platforms we have seen 3 (as in the example above). 79 */ 80 #define SkStrAppendScalar_MaxSize 15 81 82 /** 83 * Write the scaler in decimal format into buffer, and return a pointer to 84 * the next char after the last one written. Note: a terminating 0 is not 85 * written into buffer, which must be at least SkStrAppendScalar_MaxSize. 86 * Thus if the caller wants to add a 0 at the end, buffer must be at least 87 * SkStrAppendScalar_MaxSize + 1 bytes large. 88 */ 89 #define SkStrAppendScalar SkStrAppendFloat 90 91 char* SkStrAppendFloat(char buffer[], float); 92 char* SkStrAppendFixed(char buffer[], SkFixed); 93 94 /** \class SkString 95 96 Light weight class for managing strings. Uses reference 97 counting to make string assignments and copies very fast 98 with no extra RAM cost. Assumes UTF8 encoding. 99 */ 100 class SK_API SkString { 101 public: 102 SkString(); 103 explicit SkString(size_t len); 104 explicit SkString(const char text[]); 105 SkString(const char text[], size_t len); 106 SkString(const SkString&); 107 ~SkString(); 108 109 bool isEmpty() const { return 0 == fRec->fLength; } 110 size_t size() const { return (size_t) fRec->fLength; } 111 const char* c_str() const { return fRec->data(); } 112 char operator[](size_t n) const { return this->c_str()[n]; } 113 114 bool equals(const SkString&) const; 115 bool equals(const char text[]) const; 116 bool equals(const char text[], size_t len) const; 117 118 bool startsWith(const char prefixStr[]) const { 119 return SkStrStartsWith(fRec->data(), prefixStr); 120 } 121 bool startsWith(const char prefixChar) const { 122 return SkStrStartsWith(fRec->data(), prefixChar); 123 } 124 bool endsWith(const char suffixStr[]) const { 125 return SkStrEndsWith(fRec->data(), suffixStr); 126 } 127 bool endsWith(const char suffixChar) const { 128 return SkStrEndsWith(fRec->data(), suffixChar); 129 } 130 bool contains(const char substring[]) const { 131 return SkStrContains(fRec->data(), substring); 132 } 133 bool contains(const char subchar) const { 134 return SkStrContains(fRec->data(), subchar); 135 } 136 int find(const char substring[]) const { 137 return SkStrFind(fRec->data(), substring); 138 } 139 140 friend bool operator==(const SkString& a, const SkString& b) { 141 return a.equals(b); 142 } 143 friend bool operator!=(const SkString& a, const SkString& b) { 144 return !a.equals(b); 145 } 146 147 // these methods edit the string 148 149 SkString& operator=(const SkString&); 150 SkString& operator=(const char text[]); 151 152 char* writable_str(); 153 char& operator[](size_t n) { return this->writable_str()[n]; } 154 155 void reset(); 156 void resize(size_t len) { this->set(NULL, len); } 157 void set(const SkString& src) { *this = src; } 158 void set(const char text[]); 159 void set(const char text[], size_t len); 160 void setUTF16(const uint16_t[]); 161 void setUTF16(const uint16_t[], size_t len); 162 163 void insert(size_t offset, const SkString& src) { this->insert(offset, src.c_str(), src.size()); } 164 void insert(size_t offset, const char text[]); 165 void insert(size_t offset, const char text[], size_t len); 166 void insertUnichar(size_t offset, SkUnichar); 167 void insertS32(size_t offset, int32_t value); 168 void insertS64(size_t offset, int64_t value, int minDigits = 0); 169 void insertU32(size_t offset, uint32_t value); 170 void insertU64(size_t offset, uint64_t value, int minDigits = 0); 171 void insertHex(size_t offset, uint32_t value, int minDigits = 0); 172 void insertScalar(size_t offset, SkScalar); 173 174 void append(const SkString& str) { this->insert((size_t)-1, str); } 175 void append(const char text[]) { this->insert((size_t)-1, text); } 176 void append(const char text[], size_t len) { this->insert((size_t)-1, text, len); } 177 void appendUnichar(SkUnichar uni) { this->insertUnichar((size_t)-1, uni); } 178 void appendS32(int32_t value) { this->insertS32((size_t)-1, value); } 179 void appendS64(int64_t value, int minDigits = 0) { this->insertS64((size_t)-1, value, minDigits); } 180 void appendU32(uint32_t value) { this->insertU32((size_t)-1, value); } 181 void appendU64(uint64_t value, int minDigits = 0) { this->insertU64((size_t)-1, value, minDigits); } 182 void appendHex(uint32_t value, int minDigits = 0) { this->insertHex((size_t)-1, value, minDigits); } 183 void appendScalar(SkScalar value) { this->insertScalar((size_t)-1, value); } 184 185 void prepend(const SkString& str) { this->insert(0, str); } 186 void prepend(const char text[]) { this->insert(0, text); } 187 void prepend(const char text[], size_t len) { this->insert(0, text, len); } 188 void prependUnichar(SkUnichar uni) { this->insertUnichar(0, uni); } 189 void prependS32(int32_t value) { this->insertS32(0, value); } 190 void prependS64(int32_t value, int minDigits = 0) { this->insertS64(0, value, minDigits); } 191 void prependHex(uint32_t value, int minDigits = 0) { this->insertHex(0, value, minDigits); } 192 void prependScalar(SkScalar value) { this->insertScalar((size_t)-1, value); } 193 194 void printf(const char format[], ...) SK_PRINTF_LIKE(2, 3); 195 void appendf(const char format[], ...) SK_PRINTF_LIKE(2, 3); 196 void appendVAList(const char format[], va_list); 197 void prependf(const char format[], ...) SK_PRINTF_LIKE(2, 3); 198 void prependVAList(const char format[], va_list); 199 200 void remove(size_t offset, size_t length); 201 202 SkString& operator+=(const SkString& s) { this->append(s); return *this; } 203 SkString& operator+=(const char text[]) { this->append(text); return *this; } 204 SkString& operator+=(const char c) { this->append(&c, 1); return *this; } 205 206 /** 207 * Swap contents between this and other. This function is guaranteed 208 * to never fail or throw. 209 */ 210 void swap(SkString& other); 211 212 private: 213 struct Rec { 214 public: 215 uint32_t fLength; // logically size_t, but we want it to stay 32bits 216 int32_t fRefCnt; 217 char fBeginningOfData; 218 219 char* data() { return &fBeginningOfData; } 220 const char* data() const { return &fBeginningOfData; } 221 }; 222 Rec* fRec; 223 224 #ifdef SK_DEBUG 225 const char* fStr; 226 void validate() const; 227 #else 228 void validate() const {} 229 #endif 230 231 static const Rec gEmptyRec; 232 static Rec* AllocRec(const char text[], size_t len); 233 static Rec* RefRec(Rec*); 234 }; 235 236 /// Creates a new string and writes into it using a printf()-style format. 237 SkString SkStringPrintf(const char* format, ...); 238 239 // Specialized to take advantage of SkString's fast swap path. The unspecialized function is 240 // declared in SkTypes.h and called by SkTSort. 241 template <> inline void SkTSwap(SkString& a, SkString& b) { 242 a.swap(b); 243 } 244 245 // Split str on any characters in delimiters into out. (Think, strtok with a sane API.) 246 void SkStrSplit(const char* str, const char* delimiters, SkTArray<SkString>* out); 247 248 #endif 249
