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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 "core/editing/HTMLInterchange.h"
     28 
     29 #include "core/dom/Text.h"
     30 #include "core/editing/htmlediting.h"
     31 #include "core/rendering/RenderObject.h"
     32 #include "core/rendering/RenderText.h"
     33 #include "wtf/text/StringBuilder.h"
     34 #include "wtf/unicode/CharacterNames.h"
     35 
     36 namespace blink {
     37 
     38 String convertHTMLTextToInterchangeFormat(const String& in, const Text& node)
     39 {
     40     // Assume all the text comes from node.
     41     if (node.renderer() && node.renderer()->style()->preserveNewline())
     42         return in;
     43 
     44     const char convertedSpaceString[] = "<span class=\"" AppleConvertedSpace "\">\xA0</span>";
     45     COMPILE_ASSERT((static_cast<unsigned char>('\xA0') == noBreakSpace), ConvertedSpaceStringSpaceIsNoBreakSpace);
     46 
     47     StringBuilder s;
     48 
     49     unsigned i = 0;
     50     unsigned consumed = 0;
     51     while (i < in.length()) {
     52         consumed = 1;
     53         if (isCollapsibleWhitespace(in[i])) {
     54             // count number of adjoining spaces
     55             unsigned j = i + 1;
     56             while (j < in.length() && isCollapsibleWhitespace(in[j]))
     57                 j++;
     58             unsigned count = j - i;
     59             consumed = count;
     60             while (count) {
     61                 unsigned add = count % 3;
     62                 switch (add) {
     63                     case 0:
     64                         s.appendLiteral(convertedSpaceString);
     65                         s.append(' ');
     66                         s.appendLiteral(convertedSpaceString);
     67                         add = 3;
     68                         break;
     69                     case 1:
     70                         if (i == 0 || i + 1 == in.length()) // at start or end of string
     71                             s.appendLiteral(convertedSpaceString);
     72                         else
     73                             s.append(' ');
     74                         break;
     75                     case 2:
     76                         if (i == 0) {
     77                              // at start of string
     78                             s.appendLiteral(convertedSpaceString);
     79                             s.append(' ');
     80                         } else if (i + 2 == in.length()) {
     81                              // at end of string
     82                             s.appendLiteral(convertedSpaceString);
     83                             s.appendLiteral(convertedSpaceString);
     84                         } else {
     85                             s.appendLiteral(convertedSpaceString);
     86                             s.append(' ');
     87                         }
     88                         break;
     89                 }
     90                 count -= add;
     91             }
     92         } else
     93             s.append(in[i]);
     94         i += consumed;
     95     }
     96 
     97     return s.toString();
     98 }
     99 
    100 } // namespace blink
    101