icuSources/common/unistr_props.cpp

   1 /*
   2 *******************************************************************************
   3 *
   4 *   Copyright (C) 1999-2004, 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
  23 UnicodeString&
  24 UnicodeString::trim()
  25 {
  26   if(isBogus()) {
  27     return *this;
  28   }
  29
  30   UChar32 c;
  31   int32_t i = fLength, length;
  32
  33   // first cut off trailing white space
  34   for(;;) {
  35     length = i;
  36     if(i <= 0) {
  37       break;
  38     }
  39     UTF_PREV_CHAR(fArray, 0, i, c);
  40     if(!(c == 0x20 || u_isWhitespace(c))) {
  41       break;
  42     }
  43   }
  44   if(length < fLength) {
  45     fLength = length;
  46   }
  47
  48   // find leading white space
  49   int32_t start;
  50   i = 0;
  51   for(;;) {
  52     start = i;
  53     if(i >= length) {
  54       break;
  55     }
  56     UTF_NEXT_CHAR(fArray, i, length, c);
  57     if(!(c == 0x20 || u_isWhitespace(c))) {
  58       break;
  59     }
  60   }
  61
  62   // move string forward over leading white space
  63   if(start > 0) {
  64     doReplace(0, start, 0, 0, 0);
  65   }
  66
  67   return *this;
  68 }