icuSources/common/unistr_props.cpp

   1 // © 2016 and later: Unicode, Inc. and others.
   2 // License & terms of use: http://www.unicode.org/copyright.html
   3 /*
   4 *******************************************************************************
   5 *
   6 *   Copyright (C) 1999-2011, International Business Machines
   7 *   Corporation and others.  All Rights Reserved.
   8 *
   9 *******************************************************************************
  10 *   file name:  unistr_props.cpp
  11 *   encoding:   UTF-8
  12 *   tab size:   8 (not used)
  13 *   indentation:2
  14 *
  15 *   created on: 2004aug25
  16 *   created by: Markus W. Scherer
  17 *
  18 *   Character property dependent functions moved here from unistr.cpp
  19 */
  20
  21 #include "unicode/utypes.h"
  22 #include "unicode/uchar.h"
  23 #include "unicode/unistr.h"
  24 #include "unicode/utf16.h"
  25
  26 U_NAMESPACE_BEGIN
  27
  28 UnicodeString&
  29 UnicodeString::trim()
  30 {
  31   if(isBogus()) {
  32     return *this;
  33   }
  34
  35   UChar *array = getArrayStart();
  36   UChar32 c;
  37   int32_t oldLength = this->length();
  38   int32_t i = oldLength, length;
  39
  40   // first cut off trailing white space
  41   for(;;) {
  42     length = i;
  43     if(i <= 0) {
  44       break;
  45     }
  46     U16_PREV(array, 0, i, c);
  47     if(!(c == 0x20 || u_isWhitespace(c))) {
  48       break;
  49     }
  50   }
  51   if(length < oldLength) {
  52     setLength(length);
  53   }
  54
  55   // find leading white space
  56   int32_t start;
  57   i = 0;
  58   for(;;) {
  59     start = i;
  60     if(i >= length) {
  61       break;
  62     }
  63     U16_NEXT(array, i, length, c);
  64     if(!(c == 0x20 || u_isWhitespace(c))) {
  65       break;
  66     }
  67   }
  68
  69   // move string forward over leading white space
  70   if(start > 0) {
  71     doReplace(0, start, 0, 0, 0);
  72   }
  73
  74   return *this;
  75 }
  76
  77 U_NAMESPACE_END