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
36namespace blink {
37
38String 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