diff options
Diffstat (limited to 'src/gui/platform/wasm/qlocalfileapi.cpp')
-rw-r--r-- | src/gui/platform/wasm/qlocalfileapi.cpp | 211 |
1 files changed, 211 insertions, 0 deletions
diff --git a/src/gui/platform/wasm/qlocalfileapi.cpp b/src/gui/platform/wasm/qlocalfileapi.cpp new file mode 100644 index 0000000000..76b99361c4 --- /dev/null +++ b/src/gui/platform/wasm/qlocalfileapi.cpp @@ -0,0 +1,211 @@ +// 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 |