1/*
2 * Copyright (c) 2010 Google 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 are
6 * met:
7 *
8 *     * Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 *     * Redistributions in binary form must reproduce the above
11 * copyright notice, this list of conditions and the following disclaimer
12 * in the documentation and/or other materials provided with the
13 * distribution.
14 *     * Neither the name of Google Inc. nor the names of its
15 * contributors may be used to endorse or promote products derived from
16 * this software without specific prior written permission.
17 *
18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
19 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
20 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
21 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
22 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
23 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
24 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
25 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
26 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
27 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
28 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
29 */
30
31#include "config.h"
32#include "CSSOMUtils.h"
33
34#include <wtf/HexNumber.h>
35
36namespace WebCore {
37
38static void appendCharacter(UChar32 c, Vector<UChar>& appendTo)
39{
40    if (U16_LENGTH(c) == 1)
41        appendTo.append(static_cast<UChar>(c));
42    else {
43        appendTo.append(U16_LEAD(c));
44        appendTo.append(U16_TRAIL(c));
45    }
46}
47
48void serializeCharacter(UChar32 c, Vector<UChar>& appendTo)
49{
50    appendTo.append('\\');
51    appendCharacter(c, appendTo);
52}
53
54void serializeCharacterAsCodePoint(UChar32 c, Vector<UChar>& appendTo)
55{
56    appendTo.append('\\');
57    appendUnsignedAsHex(c, appendTo, Lowercase);
58    appendTo.append(' ');
59}
60
61void serializeIdentifier(const String& identifier, String& appendTo)
62{
63    Vector<UChar> addend;
64    serializeIdentifier(identifier, addend);
65    appendTo.append(String::adopt(addend));
66}
67
68void serializeIdentifier(const String& identifier, Vector<UChar>& appendTo)
69{
70    bool isFirst = true;
71    bool isSecond = false;
72    bool isFirstCharHyphen = false;
73    unsigned index = 0;
74    while (index < identifier.length()) {
75        UChar32 c = identifier.characterStartingAt(index);
76        index += U16_LENGTH(c);
77
78        if (c <= 0x1f || (0x30 <= c && c <= 0x39 && (isFirst || (isSecond && isFirstCharHyphen))))
79            serializeCharacterAsCodePoint(c, appendTo);
80        else if (c == 0x2d && isSecond && isFirstCharHyphen)
81            serializeCharacter(c, appendTo);
82        else if (0x80 <= c || c == 0x2d || c == 0x5f || (0x30 <= c && c <= 0x39) || (0x41 <= c && c <= 0x5a) || (0x61 <= c && c <= 0x7a))
83            appendCharacter(c, appendTo);
84        else
85            serializeCharacter(c, appendTo);
86
87        if (isFirst) {
88            isFirst = false;
89            isSecond = true;
90            isFirstCharHyphen = (c == 0x2d);
91        } else if (isSecond) {
92            isSecond = false;
93        }
94    }
95}
96
97void serializeString(const String& string, String& appendTo)
98{
99    Vector<UChar> addend;
100    serializeString(string, addend);
101    appendTo.append(String::adopt(addend));
102}
103
104void serializeString(const String& string, Vector<UChar>& appendTo)
105{
106    appendTo.append('\"');
107
108    unsigned index = 0;
109    while (index < string.length()) {
110        UChar32 c = string.characterStartingAt(index);
111        index += U16_LENGTH(c);
112        if (c <= 0x1f)
113            serializeCharacterAsCodePoint(c, appendTo);
114        else if (c == 0x22 || c == 0x5c)
115            serializeCharacter(c, appendTo);
116        else
117            appendCharacter(c, appendTo);
118    }
119
120    appendTo.append('\"');
121}
122
123} // namespace WebCore
124