1 /* GENERATED SOURCE. DO NOT MODIFY. */ 2 // 2016 and later: Unicode, Inc. and others. 3 // License & terms of use: http://www.unicode.org/copyright.html#License 4 /* 5 ******************************************************************************** 6 * Copyright (C) 2010-2014, Google, International Business Machines Corporation * 7 * and others. All Rights Reserved. * 8 ******************************************************************************** 9 */ 10 package android.icu.lang; 11 12 13 /** 14 * A number of utilities for dealing with CharSequences and related classes. 15 * For accessing codepoints with a CharSequence, also see 16 * <ul> 17 * <li>{@link java.lang.Character#codePointAt(CharSequence, int)}</li> 18 * <li>{@link java.lang.Character#codePointBefore(CharSequence, int)}</li> 19 * <li>{@link java.lang.Character#codePointCount(CharSequence, int, int)}</li> 20 * <li>{@link java.lang.Character#charCount(int)}</li> 21 * <li>{@link java.lang.Character#offsetByCodePoints(CharSequence, int, int)}</li> 22 * <li>{@link java.lang.Character#toChars(int, char[], int)}</li> 23 * <li>{@link java.lang.Character#toCodePoint(char, char)}</li> 24 * </ul> 25 * @author markdavis 26 * @deprecated This API is ICU internal only. 27 * @hide Only a subset of ICU is exposed in Android 28 * @hide draft / provisional / internal are hidden on Android 29 */ 30 @Deprecated 31 public class CharSequences { 32 // TODO 33 // compareTo(a, b); 34 // compareToIgnoreCase(a, b) 35 // contentEquals(a, b) 36 // contentEqualsIgnoreCase(a, b) 37 38 // contains(a, b) => indexOf >= 0 39 // endsWith(a, b) 40 // startsWith(a, b) 41 42 // lastIndexOf(a, b, fromIndex) 43 // indexOf(a, ch, fromIndex) 44 // lastIndexOf(a, ch, fromIndex); 45 46 // s.trim() => UnicodeSet.trim(CharSequence s); return a subsequence starting with the first character not in the set to the last character not in the set. 47 // add UnicodeSet.split(CharSequence s); 48 49 /** 50 * Find the longest n such that a[aIndex,n] = b[bIndex,n], and n is on a character boundary. 51 * @deprecated This API is ICU internal only. 52 * @hide draft / provisional / internal are hidden on Android 53 */ 54 @Deprecated 55 public static int matchAfter(CharSequence a, CharSequence b, int aIndex, int bIndex) { 56 int i = aIndex, j = bIndex; 57 int alen = a.length(); 58 int blen = b.length(); 59 for (; i < alen && j < blen; ++i, ++j) { 60 char ca = a.charAt(i); 61 char cb = b.charAt(j); 62 if (ca != cb) { 63 break; 64 } 65 } 66 // if we failed a match make sure that we didn't match half a character 67 int result = i - aIndex; 68 if (result != 0 && !onCharacterBoundary(a, i) && !onCharacterBoundary(b, j)) { 69 --result; // backup 70 } 71 return result; 72 } 73 74 /** 75 * Count the code point length. Unpaired surrogates count as 1. 76 * @deprecated This API is ICU internal only. 77 * @hide draft / provisional / internal are hidden on Android 78 */ 79 @Deprecated 80 public int codePointLength(CharSequence s) { 81 return Character.codePointCount(s, 0, s.length()); 82 // int length = s.length(); 83 // int result = length; 84 // for (int i = 1; i < length; ++i) { 85 // char ch = s.charAt(i); 86 // if (0xDC00 <= ch && ch <= 0xDFFF) { 87 // char ch0 = s.charAt(i-1); 88 // if (0xD800 <= ch && ch <= 0xDbFF) { 89 // --result; 90 // } 91 // } 92 // } 93 } 94 95 /** 96 * Utility function for comparing codepoint to string without generating new 97 * string. 98 * 99 * @deprecated This API is ICU internal only. 100 * @hide draft / provisional / internal are hidden on Android 101 */ 102 @Deprecated 103 public static final boolean equals(int codepoint, CharSequence other) { 104 if (other == null) { 105 return false; 106 } 107 switch (other.length()) { 108 case 1: return codepoint == other.charAt(0); 109 case 2: return codepoint > 0xFFFF && codepoint == Character.codePointAt(other, 0); 110 default: return false; 111 } 112 } 113 114 /** 115 * @deprecated This API is ICU internal only. 116 * @hide draft / provisional / internal are hidden on Android 117 */ 118 @Deprecated 119 public static final boolean equals(CharSequence other, int codepoint) { 120 return equals(codepoint, other); 121 } 122 123 /** 124 * Utility to compare a string to a code point. 125 * Same results as turning the code point into a string (with the [ugly] new StringBuilder().appendCodePoint(codepoint).toString()) 126 * and comparing, but much faster (no object creation). 127 * Actually, there is one difference; a null compares as less. 128 * Note that this (=String) order is UTF-16 order -- *not* code point order. 129 * 130 * @deprecated This API is ICU internal only. 131 * @hide draft / provisional / internal are hidden on Android 132 */ 133 @Deprecated 134 public static int compare(CharSequence string, int codePoint) { 135 if (codePoint < Character.MIN_CODE_POINT || codePoint > Character.MAX_CODE_POINT) { 136 throw new IllegalArgumentException(); 137 } 138 int stringLength = string.length(); 139 if (stringLength == 0) { 140 return -1; 141 } 142 char firstChar = string.charAt(0); 143 int offset = codePoint - Character.MIN_SUPPLEMENTARY_CODE_POINT; 144 145 if (offset < 0) { // BMP codePoint 146 int result = firstChar - codePoint; 147 if (result != 0) { 148 return result; 149 } 150 return stringLength - 1; 151 } 152 // non BMP 153 char lead = (char)((offset >>> 10) + Character.MIN_HIGH_SURROGATE); 154 int result = firstChar - lead; 155 if (result != 0) { 156 return result; 157 } 158 if (stringLength > 1) { 159 char trail = (char)((offset & 0x3ff) + Character.MIN_LOW_SURROGATE); 160 result = string.charAt(1) - trail; 161 if (result != 0) { 162 return result; 163 } 164 } 165 return stringLength - 2; 166 } 167 168 /** 169 * Utility to compare a string to a code point. 170 * Same results as turning the code point into a string and comparing, but much faster (no object creation). 171 * Actually, there is one difference; a null compares as less. 172 * Note that this (=String) order is UTF-16 order -- *not* code point order. 173 * 174 * @deprecated This API is ICU internal only. 175 * @hide draft / provisional / internal are hidden on Android 176 */ 177 @Deprecated 178 public static int compare(int codepoint, CharSequence a) { 179 int result = compare(a, codepoint); 180 return result > 0 ? -1 : result < 0 ? 1 : 0; // Reverse the order. 181 } 182 183 /** 184 * Return the value of the first code point, if the string is exactly one code point. Otherwise return Integer.MAX_VALUE. 185 * 186 * @deprecated This API is ICU internal only. 187 * @hide draft / provisional / internal are hidden on Android 188 */ 189 @Deprecated 190 public static int getSingleCodePoint(CharSequence s) { 191 int length = s.length(); 192 if (length < 1 || length > 2) { 193 return Integer.MAX_VALUE; 194 } 195 int result = Character.codePointAt(s, 0); 196 return (result < 0x10000) == (length == 1) ? result : Integer.MAX_VALUE; 197 } 198 199 /** 200 * Utility function for comparing objects that may be null 201 * string. 202 * 203 * @deprecated This API is ICU internal only. 204 * @hide draft / provisional / internal are hidden on Android 205 */ 206 @Deprecated 207 public static final <T extends Object> boolean equals(T a, T b) { 208 return a == null ? b == null 209 : b == null ? false 210 : a.equals(b); 211 } 212 213 /** 214 * Utility for comparing the contents of CharSequences 215 * 216 * @deprecated This API is ICU internal only. 217 * @hide draft / provisional / internal are hidden on Android 218 */ 219 @Deprecated 220 public static int compare(CharSequence a, CharSequence b) { 221 int alength = a.length(); 222 int blength = b.length(); 223 int min = alength <= blength ? alength : blength; 224 for (int i = 0; i < min; ++i) { 225 int diff = a.charAt(i) - b.charAt(i); 226 if (diff != 0) { 227 return diff; 228 } 229 } 230 return alength - blength; 231 } 232 233 /** 234 * Utility for comparing the contents of CharSequences 235 * 236 * @deprecated This API is ICU internal only. 237 * @hide draft / provisional / internal are hidden on Android 238 */ 239 @Deprecated 240 public static boolean equalsChars(CharSequence a, CharSequence b) { 241 // do length test first for fast path 242 return a.length() == b.length() && compare(a,b) == 0; 243 } 244 245 /** 246 * Are we on a character boundary? 247 * 248 * @deprecated This API is ICU internal only. 249 * @hide draft / provisional / internal are hidden on Android 250 */ 251 @Deprecated 252 public static boolean onCharacterBoundary(CharSequence s, int i) { 253 return i <= 0 254 || i >= s.length() 255 || !Character.isHighSurrogate(s.charAt(i-1)) 256 || !Character.isLowSurrogate(s.charAt(i)); 257 } 258 259 /** 260 * Find code point in string. 261 * 262 * @deprecated This API is ICU internal only. 263 * @hide draft / provisional / internal are hidden on Android 264 */ 265 @Deprecated 266 public static int indexOf(CharSequence s, int codePoint) { 267 int cp; 268 for (int i = 0; i < s.length(); i += Character.charCount(cp)) { 269 cp = Character.codePointAt(s, i); 270 if (cp == codePoint) { 271 return i; 272 } 273 } 274 return -1; 275 } 276 277 /** 278 * Utility function for simplified, more robust loops, such as: 279 * <pre> 280 * for (int codePoint : CharSequences.codePoints(string)) { 281 * doSomethingWith(codePoint); 282 * } 283 * </pre> 284 * 285 * @deprecated This API is ICU internal only. 286 * @hide draft / provisional / internal are hidden on Android 287 */ 288 @Deprecated 289 public static int[] codePoints(CharSequence s) { 290 int[] result = new int[s.length()]; // in the vast majority of cases, the length is the same 291 int j = 0; 292 for (int i = 0; i < s.length(); ++i) { 293 char cp = s.charAt(i); 294 if (cp >= 0xDC00 && cp <= 0xDFFF && i != 0 ) { // hand-code for speed 295 char last = (char) result[j-1]; 296 if (last >= 0xD800 && last <= 0xDBFF) { 297 // Note: j-1 is safe, because j can only be zero if i is zero. But i!=0 in this block. 298 result[j-1] = Character.toCodePoint(last, cp); 299 continue; 300 } 301 } 302 result[j++] = cp; 303 } 304 if (j == result.length) { 305 return result; 306 } 307 int[] shortResult = new int[j]; 308 System.arraycopy(result, 0, shortResult, 0, j); 309 return shortResult; 310 } 311 312 private CharSequences() { 313 } 314 } 315
