WebCore/editing/HTMLInterchange.cpp

   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
  33 namespace WebCore {
  34
  35 namespace {
  36
  37 String convertedSpaceString()
  38 {
  39     static String convertedSpaceString;
  40     if (convertedSpaceString.isNull()) {
  41         convertedSpaceString = "<span class=\"";
  42         convertedSpaceString += AppleConvertedSpace;
  43         convertedSpaceString += "\">";
  44         convertedSpaceString.append(noBreakSpace);
  45         convertedSpaceString += "</span>";
  46     }
  47     return convertedSpaceString;
  48 }
  49
  50 } // end anonymous namespace
  51
  52 String convertHTMLTextToInterchangeFormat(const String& in, const Text* node)
  53 {
  54     // Assume all the text comes from node.
  55     if (node->renderer() && node->renderer()->style()->preserveNewline())
  56         return in;
  57
  58     Vector<UChar> s;
  59
  60     unsigned i = 0;
  61     unsigned consumed = 0;
  62     while (i < in.length()) {
  63         consumed = 1;
  64         if (isCollapsibleWhitespace(in[i])) {
  65             // count number of adjoining spaces
  66             unsigned j = i + 1;
  67             while (j < in.length() && isCollapsibleWhitespace(in[j]))
  68                 j++;
  69             unsigned count = j - i;
  70             consumed = count;
  71             while (count) {
  72                 unsigned add = count % 3;
  73                 switch (add) {
  74                     case 0:
  75                         append(s, convertedSpaceString());
  76                         s.append(' ');
  77                         append(s, convertedSpaceString());
  78                         add = 3;
  79                         break;
  80                     case 1:
  81                         if (i == 0 || i + 1 == in.length()) // at start or end of string
  82                             append(s, convertedSpaceString());
  83                         else
  84                             s.append(' ');
  85                         break;
  86                     case 2:
  87                         if (i == 0) {
  88                              // at start of string
  89                             append(s, convertedSpaceString());
  90                             s.append(' ');
  91                         } else if (i + 2 == in.length()) {
  92                              // at end of string
  93                             append(s, convertedSpaceString());
  94                             append(s, convertedSpaceString());
  95                         } else {
  96                             append(s, convertedSpaceString());
  97                             s.append(' ');
  98                         }
  99                         break;
 100                 }
 101                 count -= add;
 102             }
 103         } else
 104             s.append(in[i]);
 105         i += consumed;
 106     }
 107
 108     return String::adopt(s);
 109 }
 110
 111 } // namespace WebCore