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) 2022 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only
#include "qlocalfileapi_p.h"
#include <private/qstdweb_p.h>
#include <QtCore/QRegularExpression>
QT_BEGIN_NAMESPACE
namespace LocalFileApi {
namespace {
std::string qtFilterListToFileInputAccept(const QStringList &filterList)
{
QStringList transformed;
for (const auto &filter : filterList) {
const auto type = Type::fromQt(filter);
if (type && type->accept()) {
const auto &extensions = type->accept()->mimeType().extensions();
std::transform(extensions.begin(), extensions.end(), std::back_inserter(transformed),
[](const Type::Accept::MimeType::Extension &extension) {
return extension.value().toString();
});
}
}
return transformed.join(QStringLiteral(",")).toStdString();
}
std::optional<emscripten::val> qtFilterListToTypes(const QStringList &filterList)
{
using namespace qstdweb;
using namespace emscripten;
auto types = emscripten::val::array();
for (const auto &fileFilter : filterList) {
auto type = Type::fromQt(fileFilter);
if (type) {
auto jsType = emscripten::val::object();
jsType.set("description", type->description().toString().toStdString());
if (type->accept()) {
jsType.set("accept", ([&mimeType = type->accept()->mimeType()]() {
val acceptDict = val::object();
QList<emscripten::val> extensions;
extensions.reserve(mimeType.extensions().size());
std::transform(
mimeType.extensions().begin(), mimeType.extensions().end(),
std::back_inserter(extensions),
[](const Type::Accept::MimeType::Extension &extension) {
return val(extension.value().toString().toStdString());
});
acceptDict.set("application/octet-stream",
emscripten::val::array(extensions.begin(),
extensions.end()));
return acceptDict;
})());
}
types.call<void>("push", std::move(jsType));
}
}
return types["length"].as<int>() == 0 ? std::optional<emscripten::val>() : types;
}
} // namespace
Type::Type(QStringView description, std::optional<Accept> accept)
: m_description(description.trimmed()), m_accept(std::move(accept))
{
}
Type::~Type() = default;
std::optional<Type> Type::fromQt(QStringView type)
{
using namespace emscripten;
// Accepts either a string in format:
// GROUP3
// or in this format:
// GROUP1 (GROUP2)
// Group 1 is treated as the description, whereas group 2 or 3 are treated as the filter list.
static QRegularExpression regex(
QString(QStringLiteral("(?:(?:([^(]*)\\(([^()]+)\\)[^)]*)|([^()]+))")));
const auto match = regex.matchView(type);
if (!match.hasMatch())
return std::nullopt;
constexpr size_t DescriptionIndex = 1;
constexpr size_t FilterListFromParensIndex = 2;
constexpr size_t PlainFilterListIndex = 3;
const auto description = match.hasCaptured(DescriptionIndex)
? match.capturedView(DescriptionIndex)
: QStringView();
const auto filterList = match.capturedView(match.hasCaptured(FilterListFromParensIndex)
? FilterListFromParensIndex
: PlainFilterListIndex);
auto accept = Type::Accept::fromQt(filterList);
if (!accept)
return std::nullopt;
return Type(description, std::move(*accept));
}
Type::Accept::Accept() = default;
Type::Accept::~Accept() = default;
std::optional<Type::Accept> Type::Accept::fromQt(QStringView qtRepresentation)
{
Accept accept;
// Used for accepting multiple extension specifications on a filter list.
// The next group of non-empty characters.
static QRegularExpression internalRegex(QString(QStringLiteral("([^\\s]+)\\s*")));
int offset = 0;
auto internalMatch = internalRegex.matchView(qtRepresentation, offset);
MimeType mimeType;
while (internalMatch.hasMatch()) {
auto webExtension = MimeType::Extension::fromQt(internalMatch.capturedView(1));
if (!webExtension)
return std::nullopt;
mimeType.addExtension(*webExtension);
internalMatch = internalRegex.matchView(qtRepresentation, internalMatch.capturedEnd());
}
accept.setMimeType(mimeType);
return accept;
}
void Type::Accept::setMimeType(MimeType mimeType)
{
m_mimeType = std::move(mimeType);
}
Type::Accept::MimeType::MimeType() = default;
Type::Accept::MimeType::~MimeType() = default;
void Type::Accept::MimeType::addExtension(Extension extension)
{
m_extensions.push_back(std::move(extension));
}
Type::Accept::MimeType::Extension::Extension(QStringView extension) : m_value(extension) { }
Type::Accept::MimeType::Extension::~Extension() = default;
std::optional<Type::Accept::MimeType::Extension>
Type::Accept::MimeType::Extension::fromQt(QStringView qtRepresentation)
{
// Checks for a filter that matches everything:
// Any number of asterisks or any number of asterisks with a '.' between them.
// The web filter does not support wildcards.
static QRegularExpression qtAcceptAllRegex(
QRegularExpression::anchoredPattern(QString(QStringLiteral("[*]+|[*]+\\.[*]+"))));
if (qtAcceptAllRegex.matchView(qtRepresentation).hasMatch())
return std::nullopt;
// Checks for correctness. The web filter only allows filename extensions and does not filter
// the actual filenames, therefore we check whether the filter provided only filters for the
// extension.
static QRegularExpression qtFilenameMatcherRegex(
QRegularExpression::anchoredPattern(QString(QStringLiteral("(\\*?)(\\.[^*]+)"))));
auto extensionMatch = qtFilenameMatcherRegex.matchView(qtRepresentation);
if (extensionMatch.hasMatch())
return Extension(extensionMatch.capturedView(2));
// Mapping impossible.
return std::nullopt;
}
emscripten::val makeOpenFileOptions(const QStringList &filterList, bool acceptMultiple)
{
auto options = emscripten::val::object();
if (auto typeList = qtFilterListToTypes(filterList); typeList) {
options.set("types", std::move(*typeList));
options.set("excludeAcceptAllOption", true);
}
options.set("multiple", acceptMultiple);
return options;
}
emscripten::val makeSaveFileOptions(const QStringList &filterList, const std::string& suggestedName)
{
auto options = emscripten::val::object();
if (!suggestedName.empty())
options.set("suggestedName", emscripten::val(suggestedName));
if (auto typeList = qtFilterListToTypes(filterList))
options.set("types", emscripten::val(std::move(*typeList)));
return options;
}
std::string makeFileInputAccept(const QStringList &filterList)
{
return qtFilterListToFileInputAccept(filterList);
}
} // namespace LocalFileApi
QT_END_NAMESPACE
|
