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
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
|
// Copyright (C) 2021 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GPL-3.0-only WITH Qt-GPL-exception-1.0
#include "conditionalstreamreader.h"
#include <QtCore/QDebug>
#include <QtCore/QHash>
using namespace Qt::StringLiterals;
// ProxyEntityResolver proxies a QXmlStreamEntityResolver set by the user
// on ConditionalStreamReader and stores entity definitions from the
// <?entity name value?> processing instruction in a cache
// (which is also used for the proxied resolver).
class ProxyEntityResolver : public QXmlStreamEntityResolver
{
public:
QString resolveEntity(const QString& publicId,
const QString& systemId) override;
QString resolveUndeclaredEntity(const QString &name) override;
QXmlStreamEntityResolver *source() const { return m_source; }
void setSource(QXmlStreamEntityResolver *s) { m_source = s; }
void defineEntity(const QString &name, const QString &value)
{
m_undeclaredEntityCache.insert(name, value);
}
private:
QHash<QString, QString> m_undeclaredEntityCache;
QXmlStreamEntityResolver *m_source = nullptr;
};
QString ProxyEntityResolver::resolveEntity(const QString &publicId, const QString &systemId)
{
QString result;
if (m_source != nullptr)
result = m_source->resolveEntity(publicId, systemId);
if (result.isEmpty())
result = QXmlStreamEntityResolver::resolveEntity(publicId, systemId);
return result;
}
QString ProxyEntityResolver::resolveUndeclaredEntity(const QString &name)
{
const auto it = m_undeclaredEntityCache.constFind(name);
if (it != m_undeclaredEntityCache.constEnd())
return it.value();
if (m_source == nullptr)
return {};
const QString result = m_source->resolveUndeclaredEntity(name);
if (!result.isEmpty())
defineEntity(name, result);
return result;
}
ConditionalStreamReader::ConditionalStreamReader(QIODevice *iod) :
m_reader(iod)
{
init();
}
ConditionalStreamReader::ConditionalStreamReader(const QString &s) :
m_reader(s)
{
init();
}
void ConditionalStreamReader::init()
{
m_proxyEntityResolver = new ProxyEntityResolver;
m_reader.setEntityResolver(m_proxyEntityResolver);
}
ConditionalStreamReader::~ConditionalStreamReader()
{
m_reader.setEntityResolver(nullptr);
delete m_proxyEntityResolver;
}
void ConditionalStreamReader::setEntityResolver(QXmlStreamEntityResolver *resolver)
{
m_proxyEntityResolver->setSource(resolver);
}
QXmlStreamEntityResolver *ConditionalStreamReader::entityResolver() const
{
return m_proxyEntityResolver->source();
}
QXmlStreamReader::TokenType ConditionalStreamReader::readNext()
{
auto exToken = readNextInternal();
if (exToken.second == PiTokens::EntityDefinition)
return readEntityDefinitonPi() ? exToken.first : QXmlStreamReader::Invalid;
if (exToken.second != PiTokens::If || conditionMatches())
return exToken.first;
// Condition does not match - search for endif
int nestingLevel = 1;
while (true) {
exToken = readNextInternal();
if (exToken.first == QXmlStreamReader::NoToken
|| exToken.first == QXmlStreamReader::Invalid
|| exToken.first == QXmlStreamReader::EndDocument) {
break;
}
if (exToken.second == PiTokens::If)
++nestingLevel;
else if (exToken.second == PiTokens::Endif && --nestingLevel == 0)
break;
}
return exToken.first;
}
void ConditionalStreamReader::defineEntity(const QString &name, const QString &value)
{
m_proxyEntityResolver->defineEntity(name, value);
}
// Read an entity definition: "<?entity name value?>:
bool ConditionalStreamReader::readEntityDefinitonPi()
{
const auto data = m_reader.processingInstructionData();
const auto separator = data.indexOf(u' ');
if (separator <= 0 || separator == data.size() - 1) {
m_reader.raiseError(u"Malformed entity definition: "_s + data.toString());
return false;
}
defineEntity(data.left(separator).toString(),
data.right(data.size() - separator - 1).toString());
return true;
}
bool ConditionalStreamReader::conditionMatches() const
{
const auto keywords = m_reader.processingInstructionData().split(u' ', Qt::SkipEmptyParts);
if (keywords.isEmpty())
return false;
bool matches = false;
bool exclusionOnly = true;
for (const auto &keyword : keywords) {
if (keyword.startsWith(u'!')) { // exclusion '!windows' takes preference
if (m_conditions.contains(keyword.mid(1)))
return false;
} else {
exclusionOnly = false;
matches |= m_conditions.contains(keyword);
}
}
return exclusionOnly || matches;
}
void ConditionalStreamReader::setConditions(const QStringList &newConditions)
{
m_conditions = newConditions + platformConditions();
}
QStringList ConditionalStreamReader::platformConditions()
{
QStringList result;
#if defined (Q_OS_UNIX)
result << QStringLiteral("unix");
#endif
#if defined (Q_OS_LINUX)
result << QStringLiteral("linux");
#elif defined (Q_OS_MACOS)
result << QStringLiteral("darwin");
#elif defined (Q_OS_WINDOWS)
result << QStringLiteral("windows");
#endif
return result;
}
ConditionalStreamReader::ExtendedToken ConditionalStreamReader::readNextInternal()
{
const auto token = m_reader.readNext();
PiTokens piToken = PiTokens::None;
if (token == QXmlStreamReader::ProcessingInstruction) {
const auto target = m_reader.processingInstructionTarget();
if (target == u"if")
piToken = PiTokens::If;
else if (target == u"endif")
piToken = PiTokens::Endif;
else if (target == u"entity")
piToken = PiTokens::EntityDefinition;
}
return {token, piToken};
}
QDebug operator<<(QDebug dbg, const QXmlStreamAttributes &attrs)
{
QDebugStateSaver saver(dbg);
dbg.noquote();
dbg.nospace();
dbg << "QXmlStreamAttributes(";
for (qsizetype i = 0, size = attrs.size(); i < size; ++i ) {
if (i)
dbg << ", ";
dbg << attrs.at(i).name() << "=\"" << attrs.at(i).value() << '"';
}
dbg << ')';
return dbg;
}
|
