icuSources/common/uchriter.cpp

   1 // © 2016 and later: Unicode, Inc. and others.
   2 // License & terms of use: http://www.unicode.org/copyright.html
   3 /*
   4 ******************************************************************************
   5 * Copyright (C) 1998-2012, International Business Machines Corporation and
   6 * others. All Rights Reserved.
   7 ******************************************************************************
   8 */
   9
  10 #include "utypeinfo.h"  // for 'typeid' to work
  11
  12 #include "unicode/uchriter.h"
  13 #include "unicode/ustring.h"
  14 #include "unicode/utf16.h"
  15 #include "ustr_imp.h"
  16
  17 U_NAMESPACE_BEGIN
  18
  19 UOBJECT_DEFINE_RTTI_IMPLEMENTATION(UCharCharacterIterator)
  20
  21 UCharCharacterIterator::UCharCharacterIterator()
  22   : CharacterIterator(),
  23   text(0)
  24 {
  25     // never default construct!
  26 }
  27
  28 UCharCharacterIterator::UCharCharacterIterator(ConstChar16Ptr textPtr,
  29                                                int32_t length)
  30   : CharacterIterator(textPtr != 0 ? (length>=0 ? length : u_strlen(textPtr)) : 0),
  31   text(textPtr)
  32 {
  33 }
  34
  35 UCharCharacterIterator::UCharCharacterIterator(ConstChar16Ptr textPtr,
  36                                                int32_t length,
  37                                                int32_t position)
  38   : CharacterIterator(textPtr != 0 ? (length>=0 ? length : u_strlen(textPtr)) : 0, position),
  39   text(textPtr)
  40 {
  41 }
  42
  43 UCharCharacterIterator::UCharCharacterIterator(ConstChar16Ptr textPtr,
  44                                                int32_t length,
  45                                                int32_t textBegin,
  46                                                int32_t textEnd,
  47                                                int32_t position)
  48   : CharacterIterator(textPtr != 0 ? (length>=0 ? length : u_strlen(textPtr)) : 0, textBegin, textEnd, position),
  49   text(textPtr)
  50 {
  51 }
  52
  53 UCharCharacterIterator::UCharCharacterIterator(const UCharCharacterIterator& that)
  54 : CharacterIterator(that),
  55   text(that.text)
  56 {
  57 }
  58
  59 UCharCharacterIterator&
  60 UCharCharacterIterator::operator=(const UCharCharacterIterator& that) {
  61     CharacterIterator::operator=(that);
  62     text = that.text;
  63     return *this;
  64 }
  65
  66 UCharCharacterIterator::~UCharCharacterIterator() {
  67 }
  68
  69 UBool
  70 UCharCharacterIterator::operator==(const ForwardCharacterIterator& that) const {
  71     if (this == &that) {
  72         return TRUE;
  73     }
  74     if (typeid(*this) != typeid(that)) {
  75         return FALSE;
  76     }
  77
  78     UCharCharacterIterator&    realThat = (UCharCharacterIterator&)that;
  79
  80     return text == realThat.text
  81         && textLength == realThat.textLength
  82         && pos == realThat.pos
  83         && begin == realThat.begin
  84         && end == realThat.end;
  85 }
  86
  87 int32_t
  88 UCharCharacterIterator::hashCode() const {
  89     return ustr_hashUCharsN(text, textLength) ^ pos ^ begin ^ end;
  90 }
  91
  92 CharacterIterator*
  93 UCharCharacterIterator::clone() const {
  94     return new UCharCharacterIterator(*this);
  95 }
  96
  97 UChar
  98 UCharCharacterIterator::first() {
  99     pos = begin;
 100     if(pos < end) {
 101         return text[pos];
 102     } else {
 103         return DONE;
 104     }
 105 }
 106
 107 UChar
 108 UCharCharacterIterator::firstPostInc() {
 109     pos = begin;
 110     if(pos < end) {
 111         return text[pos++];
 112     } else {
 113         return DONE;
 114     }
 115 }
 116
 117 UChar
 118 UCharCharacterIterator::last() {
 119     pos = end;
 120     if(pos > begin) {
 121         return text[--pos];
 122     } else {
 123         return DONE;
 124     }
 125 }
 126
 127 UChar
 128 UCharCharacterIterator::setIndex(int32_t position) {
 129     if(position < begin) {
 130         pos = begin;
 131     } else if(position > end) {
 132         pos = end;
 133     } else {
 134         pos = position;
 135     }
 136     if(pos < end) {
 137         return text[pos];
 138     } else {
 139         return DONE;
 140     }
 141 }
 142
 143 UChar
 144 UCharCharacterIterator::current() const {
 145     if (pos >= begin && pos < end) {
 146         return text[pos];
 147     } else {
 148         return DONE;
 149     }
 150 }
 151
 152 UChar
 153 UCharCharacterIterator::next() {
 154     if (pos + 1 < end) {
 155         return text[++pos];
 156     } else {
 157         /* make current() return DONE */
 158         pos = end;
 159         return DONE;
 160     }
 161 }
 162
 163 UChar
 164 UCharCharacterIterator::nextPostInc() {
 165     if (pos < end) {
 166         return text[pos++];
 167     } else {
 168         return DONE;
 169     }
 170 }
 171
 172 UBool
 173 UCharCharacterIterator::hasNext() {
 174     return (UBool)(pos < end ? TRUE : FALSE);
 175 }
 176
 177 UChar
 178 UCharCharacterIterator::previous() {
 179     if (pos > begin) {
 180         return text[--pos];
 181     } else {
 182         return DONE;
 183     }
 184 }
 185
 186 UBool
 187 UCharCharacterIterator::hasPrevious() {
 188     return (UBool)(pos > begin ? TRUE : FALSE);
 189 }
 190
 191 UChar32
 192 UCharCharacterIterator::first32() {
 193     pos = begin;
 194     if(pos < end) {
 195         int32_t i = pos;
 196         UChar32 c;
 197         U16_NEXT(text, i, end, c);
 198         return c;
 199     } else {
 200         return DONE;
 201     }
 202 }
 203
 204 UChar32
 205 UCharCharacterIterator::first32PostInc() {
 206     pos = begin;
 207     if(pos < end) {
 208         UChar32 c;
 209         U16_NEXT(text, pos, end, c);
 210         return c;
 211     } else {
 212         return DONE;
 213     }
 214 }
 215
 216 UChar32
 217 UCharCharacterIterator::last32() {
 218     pos = end;
 219     if(pos > begin) {
 220         UChar32 c;
 221         U16_PREV(text, begin, pos, c);
 222         return c;
 223     } else {
 224         return DONE;
 225     }
 226 }
 227
 228 UChar32
 229 UCharCharacterIterator::setIndex32(int32_t position) {
 230     if(position < begin) {
 231         position = begin;
 232     } else if(position > end) {
 233         position = end;
 234     }
 235     if(position < end) {
 236         U16_SET_CP_START(text, begin, position);
 237         int32_t i = this->pos = position;
 238         UChar32 c;
 239         U16_NEXT(text, i, end, c);
 240         return c;
 241     } else {
 242         this->pos = position;
 243         return DONE;
 244     }
 245 }
 246
 247 UChar32
 248 UCharCharacterIterator::current32() const {
 249     if (pos >= begin && pos < end) {
 250         UChar32 c;
 251         U16_GET(text, begin, pos, end, c);
 252         return c;
 253     } else {
 254         return DONE;
 255     }
 256 }
 257
 258 UChar32
 259 UCharCharacterIterator::next32() {
 260     if (pos < end) {
 261         U16_FWD_1(text, pos, end);
 262         if(pos < end) {
 263             int32_t i = pos;
 264             UChar32 c;
 265             U16_NEXT(text, i, end, c);
 266             return c;
 267         }
 268     }
 269     /* make current() return DONE */
 270     pos = end;
 271     return DONE;
 272 }
 273
 274 UChar32
 275 UCharCharacterIterator::next32PostInc() {
 276     if (pos < end) {
 277         UChar32 c;
 278         U16_NEXT(text, pos, end, c);
 279         return c;
 280     } else {
 281         return DONE;
 282     }
 283 }
 284
 285 UChar32
 286 UCharCharacterIterator::previous32() {
 287     if (pos > begin) {
 288         UChar32 c;
 289         U16_PREV(text, begin, pos, c);
 290         return c;
 291     } else {
 292         return DONE;
 293     }
 294 }
 295
 296 int32_t
 297 UCharCharacterIterator::move(int32_t delta, CharacterIterator::EOrigin origin) {
 298     switch(origin) {
 299     case kStart:
 300         pos = begin + delta;
 301         break;
 302     case kCurrent:
 303         pos += delta;
 304         break;
 305     case kEnd:
 306         pos = end + delta;
 307         break;
 308     default:
 309         break;
 310     }
 311
 312     if(pos < begin) {
 313         pos = begin;
 314     } else if(pos > end) {
 315         pos = end;
 316     }
 317
 318     return pos;
 319 }
 320
 321 int32_t
 322 UCharCharacterIterator::move32(int32_t delta, CharacterIterator::EOrigin origin) {
 323     // this implementation relies on the "safe" version of the UTF macros
 324     // (or the trustworthiness of the caller)
 325     switch(origin) {
 326     case kStart:
 327         pos = begin;
 328         if(delta > 0) {
 329             U16_FWD_N(text, pos, end, delta);
 330         }
 331         break;
 332     case kCurrent:
 333         if(delta > 0) {
 334             U16_FWD_N(text, pos, end, delta);
 335         } else {
 336             U16_BACK_N(text, begin, pos, -delta);
 337         }
 338         break;
 339     case kEnd:
 340         pos = end;
 341         if(delta < 0) {
 342             U16_BACK_N(text, begin, pos, -delta);
 343         }
 344         break;
 345     default:
 346         break;
 347     }
 348
 349     return pos;
 350 }
 351
 352 void UCharCharacterIterator::setText(ConstChar16Ptr newText,
 353                                      int32_t      newTextLength) {
 354     text = newText;
 355     if(newText == 0 || newTextLength < 0) {
 356         newTextLength = 0;
 357     }
 358     end = textLength = newTextLength;
 359     pos = begin = 0;
 360 }
 361
 362 void
 363 UCharCharacterIterator::getText(UnicodeString& result) {
 364     result = UnicodeString(text, textLength);
 365 }
 366
 367 U_NAMESPACE_END