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
|
/*
* Copyright (C) 2004, 2008, 2009 Apple Inc. All rights reserved.
* Copyright (C) 2008 Collabora Ltd.
* Copyright (C) 2011 Peter Varga (pvarga@webkit.org), University of Szeged
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``AS IS'' AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE COMPUTER, INC. OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "config.h"
#include "RegularExpression.h"
#include <wtf/BumpPointerAllocator.h>
#include <yarr/Yarr.h>
#include "Logging.h"
namespace WebCore {
class RegularExpression::Private : public RefCounted<RegularExpression::Private> {
public:
static PassRefPtr<Private> create(const String& pattern, TextCaseSensitivity caseSensitivity, MultilineMode multilineMode)
{
return adoptRef(new Private(pattern, caseSensitivity, multilineMode));
}
int lastMatchLength;
unsigned m_numSubpatterns;
OwnPtr<JSC::Yarr::BytecodePattern> m_regExpByteCode;
private:
Private(const String& pattern, TextCaseSensitivity caseSensitivity, MultilineMode multilineMode)
: lastMatchLength(-1)
, m_regExpByteCode(compile(pattern, caseSensitivity, multilineMode))
, m_constructionError(0)
{
}
PassOwnPtr<JSC::Yarr::BytecodePattern> compile(const String& patternString, TextCaseSensitivity caseSensitivity, MultilineMode multilineMode)
{
JSC::Yarr::YarrPattern pattern(patternString, (caseSensitivity == TextCaseInsensitive), (multilineMode == MultilineEnabled), &m_constructionError);
if (m_constructionError) {
LOG_ERROR("RegularExpression: YARR compile failed with '%s'", m_constructionError);
return nullptr;
}
m_numSubpatterns = pattern.m_numSubpatterns;
return JSC::Yarr::byteCompile(pattern, &m_regexAllocator);
}
BumpPointerAllocator m_regexAllocator;
const char* m_constructionError;
};
RegularExpression::RegularExpression(const String& pattern, TextCaseSensitivity caseSensitivity, MultilineMode multilineMode)
: d(Private::create(pattern, caseSensitivity, multilineMode))
{
}
RegularExpression::RegularExpression(const RegularExpression& re)
: d(re.d)
{
}
RegularExpression::~RegularExpression()
{
}
RegularExpression& RegularExpression::operator=(const RegularExpression& re)
{
d = re.d;
return *this;
}
int RegularExpression::match(const String& str, int startFrom, int* matchLength) const
{
if (!d->m_regExpByteCode)
return -1;
if (str.isNull())
return -1;
int offsetVectorSize = (d->m_numSubpatterns + 1) * 2;
unsigned* offsetVector;
Vector<unsigned, 32> nonReturnedOvector;
nonReturnedOvector.resize(offsetVectorSize);
offsetVector = nonReturnedOvector.data();
ASSERT(offsetVector);
for (unsigned j = 0, i = 0; i < d->m_numSubpatterns + 1; j += 2, i++)
offsetVector[j] = JSC::Yarr::offsetNoMatch;
unsigned result;
if (str.length() <= INT_MAX)
result = JSC::Yarr::interpret(d->m_regExpByteCode.get(), str, startFrom, offsetVector);
else {
// This code can't handle unsigned offsets. Limit our processing to strings with offsets that
// can be represented as ints.
result = JSC::Yarr::offsetNoMatch;
}
if (result == JSC::Yarr::offsetNoMatch) {
d->lastMatchLength = -1;
return -1;
}
// 1 means 1 match; 0 means more than one match. First match is recorded in offsetVector.
d->lastMatchLength = offsetVector[1] - offsetVector[0];
if (matchLength)
*matchLength = d->lastMatchLength;
return offsetVector[0];
}
int RegularExpression::searchRev(const String& str) const
{
// FIXME: This could be faster if it actually searched backwards.
// Instead, it just searches forwards, multiple times until it finds the last match.
int start = 0;
int pos;
int lastPos = -1;
int lastMatchLength = -1;
do {
int matchLength;
pos = match(str, start, &matchLength);
if (pos >= 0) {
if (pos + matchLength > lastPos + lastMatchLength) {
// replace last match if this one is later and not a subset of the last match
lastPos = pos;
lastMatchLength = matchLength;
}
start = pos + 1;
}
} while (pos != -1);
d->lastMatchLength = lastMatchLength;
return lastPos;
}
int RegularExpression::matchedLength() const
{
return d->lastMatchLength;
}
void replace(String& string, const RegularExpression& target, const String& replacement)
{
int index = 0;
while (index < static_cast<int>(string.length())) {
int matchLength;
index = target.match(string, index, &matchLength);
if (index < 0)
break;
string.replace(index, matchLength, replacement);
index += replacement.length();
if (!matchLength)
break; // Avoid infinite loop on 0-length matches, e.g. [a-z]*
}
}
bool RegularExpression::isValid() const
{
return d->m_regExpByteCode;
}
} // namespace WebCore
|
