michael@0: /*
michael@0: *******************************************************************************
michael@0: *
michael@0: *   Copyright (C) 1999-2011, International Business Machines
michael@0: *   Corporation and others.  All Rights Reserved.
michael@0: *
michael@0: *******************************************************************************
michael@0: *   file name:  unistr_props.cpp
michael@0: *   encoding:   US-ASCII
michael@0: *   tab size:   8 (not used)
michael@0: *   indentation:2
michael@0: *
michael@0: *   created on: 2004aug25
michael@0: *   created by: Markus W. Scherer
michael@0: *
michael@0: *   Character property dependent functions moved here from unistr.cpp
michael@0: */
michael@0: 
michael@0: #include "unicode/utypes.h"
michael@0: #include "unicode/uchar.h"
michael@0: #include "unicode/unistr.h"
michael@0: #include "unicode/utf16.h"
michael@0: 
michael@0: U_NAMESPACE_BEGIN
michael@0: 
michael@0: UnicodeString& 
michael@0: UnicodeString::trim()
michael@0: {
michael@0:   if(isBogus()) {
michael@0:     return *this;
michael@0:   }
michael@0: 
michael@0:   UChar *array = getArrayStart();
michael@0:   UChar32 c;
michael@0:   int32_t oldLength = this->length();
michael@0:   int32_t i = oldLength, length;
michael@0: 
michael@0:   // first cut off trailing white space
michael@0:   for(;;) {
michael@0:     length = i;
michael@0:     if(i <= 0) {
michael@0:       break;
michael@0:     }
michael@0:     U16_PREV(array, 0, i, c);
michael@0:     if(!(c == 0x20 || u_isWhitespace(c))) {
michael@0:       break;
michael@0:     }
michael@0:   }
michael@0:   if(length < oldLength) {
michael@0:     setLength(length);
michael@0:   }
michael@0: 
michael@0:   // find leading white space
michael@0:   int32_t start;
michael@0:   i = 0;
michael@0:   for(;;) {
michael@0:     start = i;
michael@0:     if(i >= length) {
michael@0:       break;
michael@0:     }
michael@0:     U16_NEXT(array, i, length, c);
michael@0:     if(!(c == 0x20 || u_isWhitespace(c))) {
michael@0:       break;
michael@0:     }
michael@0:   }
michael@0: 
michael@0:   // move string forward over leading white space
michael@0:   if(start > 0) {
michael@0:     doReplace(0, start, 0, 0, 0);
michael@0:   }
michael@0: 
michael@0:   return *this;
michael@0: }
michael@0: 
michael@0: U_NAMESPACE_END