icuSources/common/unistr_props.cpp

   1 /*
   2 *******************************************************************************
   3 *
   4 *   Copyright (C) 1999-2011, International Business Machines
   5 *   Corporation and others.  All Rights Reserved.
   6 *
   7 *******************************************************************************
   8 *   file name:  unistr_props.cpp
   9 *   encoding:   US-ASCII
  10 *   tab size:   8 (not used)
  11 *   indentation:2
  12 *
  13 *   created on: 2004aug25
  14 *   created by: Markus W. Scherer
  15 *
  16 *   Character property dependent functions moved here from unistr.cpp
  17 */
  18
  19 #include "unicode/utypes.h"
  20 #include "unicode/uchar.h"
  21 #include "unicode/unistr.h"
  22 #include "unicode/utf16.h"
  23
  24 U_NAMESPACE_BEGIN
  25
  26 UnicodeString&
  27 UnicodeString::trim()
  28 {
  29   if(isBogus()) {
  30     return *this;
  31   }
  32
  33   UChar *array = getArrayStart();
  34   UChar32 c;
  35   int32_t oldLength = this->length();
  36   int32_t i = oldLength, length;
  37
  38   // first cut off trailing white space
  39   for(;;) {
  40     length = i;
  41     if(i <= 0) {
  42       break;
  43     }
  44     U16_PREV(array, 0, i, c);
  45     if(!(c == 0x20 || u_isWhitespace(c))) {
  46       break;
  47     }
  48   }
  49   if(length < oldLength) {
  50     setLength(length);
  51   }
  52
  53   // find leading white space
  54   int32_t start;
  55   i = 0;
  56   for(;;) {
  57     start = i;
  58     if(i >= length) {
  59       break;
  60     }
  61     U16_NEXT(array, i, length, c);
  62     if(!(c == 0x20 || u_isWhitespace(c))) {
  63       break;
  64     }
  65   }
  66
  67   // move string forward over leading white space
  68   if(start > 0) {
  69     doReplace(0, start, 0, 0, 0);
  70   }
  71
  72   return *this;
  73 }
  74
  75 U_NAMESPACE_END