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      1 /*
      2  * Copyright (C) 2004, 2008 Apple Inc.  All rights reserved.
      3  *
      4  * Redistribution and use in source and binary forms, with or without
      5  * modification, are permitted provided that the following conditions
      6  * are met:
      7  * 1. Redistributions of source code must retain the above copyright
      8  *    notice, this list of conditions and the following disclaimer.
      9  * 2. Redistributions in binary form must reproduce the above copyright
     10  *    notice, this list of conditions and the following disclaimer in the
     11  *    documentation and/or other materials provided with the distribution.
     12  *
     13  * THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``AS IS'' AND ANY
     14  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     15  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     16  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE COMPUTER, INC. OR
     17  * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
     18  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
     19  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
     20  * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
     21  * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     22  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
     23  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     24  */
     25 
     26 #include "config.h"
     27 #include "HTMLInterchange.h"
     28 
     29 #include "CharacterNames.h"
     30 #include "Text.h"
     31 #include "TextIterator.h"
     32 #include <wtf/StdLibExtras.h>
     33 
     34 namespace WebCore {
     35 
     36 namespace {
     37 
     38 String convertedSpaceString()
     39 {
     40     DEFINE_STATIC_LOCAL(String, convertedSpaceString, ());
     41     if (convertedSpaceString.isNull()) {
     42         convertedSpaceString = "<span class=\"";
     43         convertedSpaceString += AppleConvertedSpace;
     44         convertedSpaceString += "\">";
     45         convertedSpaceString.append(noBreakSpace);
     46         convertedSpaceString += "</span>";
     47     }
     48     return convertedSpaceString;
     49 }
     50 
     51 } // end anonymous namespace
     52 
     53 String convertHTMLTextToInterchangeFormat(const String& in, const Text* node)
     54 {
     55     // Assume all the text comes from node.
     56     if (node->renderer() && node->renderer()->style()->preserveNewline())
     57         return in;
     58 
     59     Vector<UChar> s;
     60 
     61     unsigned i = 0;
     62     unsigned consumed = 0;
     63     while (i < in.length()) {
     64         consumed = 1;
     65         if (isCollapsibleWhitespace(in[i])) {
     66             // count number of adjoining spaces
     67             unsigned j = i + 1;
     68             while (j < in.length() && isCollapsibleWhitespace(in[j]))
     69                 j++;
     70             unsigned count = j - i;
     71             consumed = count;
     72             while (count) {
     73                 unsigned add = count % 3;
     74                 switch (add) {
     75                     case 0:
     76                         append(s, convertedSpaceString());
     77                         s.append(' ');
     78                         append(s, convertedSpaceString());
     79                         add = 3;
     80                         break;
     81                     case 1:
     82                         if (i == 0 || i + 1 == in.length()) // at start or end of string
     83                             append(s, convertedSpaceString());
     84                         else
     85                             s.append(' ');
     86                         break;
     87                     case 2:
     88                         if (i == 0) {
     89                              // at start of string
     90                             append(s, convertedSpaceString());
     91                             s.append(' ');
     92                         } else if (i + 2 == in.length()) {
     93                              // at end of string
     94                             append(s, convertedSpaceString());
     95                             append(s, convertedSpaceString());
     96                         } else {
     97                             append(s, convertedSpaceString());
     98                             s.append(' ');
     99                         }
    100                         break;
    101                 }
    102                 count -= add;
    103             }
    104         } else
    105             s.append(in[i]);
    106         i += consumed;
    107     }
    108 
    109     return String::adopt(s);
    110 }
    111 
    112 } // namespace WebCore
    113