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 "Text.h"
30#include "TextIterator.h"
31#include <wtf/StdLibExtras.h>
32#include <wtf/unicode/CharacterNames.h>
33
34namespace WebCore {
35
36namespace {
37
38String 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
53String 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