1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
|
/*
* Copyright (C) 2003 Lars Knoll (knoll@kde.org)
* Copyright (C) 2005 Allan Sandfeld Jensen (kde@carewolf.com)
* Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012 Apple Inc. All rights reserved.
* Copyright (C) 2007 Nicholas Shanks <webkit@nickshanks.com>
* Copyright (C) 2008 Eric Seidel <eric@webkit.org>
* Copyright (C) 2009 Torch Mobile Inc. All rights reserved. (http://www.torchmobile.com/)
* Copyright (C) 2012 Adobe Systems Incorporated. All rights reserved.
* Copyright (C) 2012 Intel Corporation. All rights reserved.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public License
* along with this library; see the file COPYING.LIB. If not, write to
* the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
* Boston, MA 02110-1301, USA.
*/
#include "config.h"
#include "core/css/CSSMarkup.h"
#include "wtf/HexNumber.h"
#include "wtf/text/StringBuffer.h"
namespace WebCore {
template <typename CharacterType>
static inline bool isCSSTokenizerIdentifier(const CharacterType* characters, unsigned length)
{
const CharacterType* end = characters + length;
// -?
if (characters != end && characters[0] == '-')
++characters;
// {nmstart}
if (characters == end || !(characters[0] == '_' || characters[0] >= 128 || isASCIIAlpha(characters[0])))
return false;
++characters;
// {nmchar}*
for (; characters != end; ++characters) {
if (!(characters[0] == '_' || characters[0] == '-' || characters[0] >= 128 || isASCIIAlphanumeric(characters[0])))
return false;
}
return true;
}
// "ident" from the CSS tokenizer, minus backslash-escape sequences
static bool isCSSTokenizerIdentifier(const String& string)
{
unsigned length = string.length();
if (!length)
return false;
if (string.is8Bit())
return isCSSTokenizerIdentifier(string.characters8(), length);
return isCSSTokenizerIdentifier(string.characters16(), length);
}
template <typename CharacterType>
static inline bool isCSSTokenizerURL(const CharacterType* characters, unsigned length)
{
const CharacterType* end = characters + length;
for (; characters != end; ++characters) {
CharacterType c = characters[0];
switch (c) {
case '!':
case '#':
case '$':
case '%':
case '&':
break;
default:
if (c < '*')
return false;
if (c <= '~')
break;
if (c < 128)
return false;
}
}
return true;
}
// "url" from the CSS tokenizer, minus backslash-escape sequences
static bool isCSSTokenizerURL(const String& string)
{
unsigned length = string.length();
if (!length)
return true;
if (string.is8Bit())
return isCSSTokenizerURL(string.characters8(), length);
return isCSSTokenizerURL(string.characters16(), length);
}
template <typename CharacterType>
static inline String quoteCSSStringInternal(const CharacterType* characters, unsigned length)
{
// For efficiency, we first pre-calculate the length of the quoted string, then we build the actual one.
// Please see below for the actual logic.
unsigned quotedStringSize = 2; // Two quotes surrounding the entire string.
bool afterEscape = false;
for (unsigned i = 0; i < length; ++i) {
CharacterType ch = characters[i];
if (ch == '\\' || ch == '\'') {
quotedStringSize += 2;
afterEscape = false;
} else if (ch < 0x20 || ch == 0x7F) {
quotedStringSize += 2 + (ch >= 0x10);
afterEscape = true;
} else {
quotedStringSize += 1 + (afterEscape && (isASCIIHexDigit(ch) || ch == ' '));
afterEscape = false;
}
}
StringBuffer<CharacterType> buffer(quotedStringSize);
unsigned index = 0;
buffer[index++] = '\'';
afterEscape = false;
for (unsigned i = 0; i < length; ++i) {
CharacterType ch = characters[i];
if (ch == '\\' || ch == '\'') {
buffer[index++] = '\\';
buffer[index++] = ch;
afterEscape = false;
} else if (ch < 0x20 || ch == 0x7F) { // Control characters.
buffer[index++] = '\\';
placeByteAsHexCompressIfPossible(ch, buffer, index, Lowercase);
afterEscape = true;
} else {
// Space character may be required to separate backslash-escape sequence and normal characters.
if (afterEscape && (isASCIIHexDigit(ch) || ch == ' '))
buffer[index++] = ' ';
buffer[index++] = ch;
afterEscape = false;
}
}
buffer[index++] = '\'';
ASSERT(quotedStringSize == index);
return String::adopt(buffer);
}
// We use single quotes for now because markup.cpp uses double quotes.
String quoteCSSString(const String& string)
{
// This function expands each character to at most 3 characters ('\u0010' -> '\' '1' '0') as well as adds
// 2 quote characters (before and after). Make sure the resulting size (3 * length + 2) will not overflow unsigned.
unsigned length = string.length();
if (!length)
return String("\'\'");
if (length > std::numeric_limits<unsigned>::max() / 3 - 2)
return emptyString();
if (string.is8Bit())
return quoteCSSStringInternal(string.characters8(), length);
return quoteCSSStringInternal(string.characters16(), length);
}
String quoteCSSStringIfNeeded(const String& string)
{
return isCSSTokenizerIdentifier(string) ? string : quoteCSSString(string);
}
String quoteCSSURLIfNeeded(const String& string)
{
return isCSSTokenizerURL(string) ? string : quoteCSSString(string);
}
} // namespace WebCore
|
