Create the Qt File Filter => showOpen/SaveFilePicker options mapper

As a preparatory measure for using showXFilePicker, the Qt file
filter has to be transformed to the format used by the showXFilePicker
(sXFP) options. A class structure reflecting the options was created. Based on
an input in the form of a qt file filter, it will parse the filter to
the sXFP options format. Unit tests were added and the code is not yet
used in non-test env, next change will use it.

Task-number: QTBUG-99611
Change-Id: I277286467a7b5ce6f323c19bdd31740a41b6a6be
Reviewed-by: Morten Johan Sørvig <morten.sorvig@qt.io>

2 files changed, 235 insertions, 0 deletions

diff --git a/tests/auto/wasm/CMakeLists.txt b/tests/auto/wasm/CMakeLists.txt
index 2e6c6976fb..6c10838a92 100644
--- a/tests/auto/wasm/CMakeLists.txt
+++ b/tests/auto/wasm/CMakeLists.txt
@@ -2,6 +2,20 @@
 ## tst_wasm Test:
 #####################################################################
 
+qt_internal_add_test(tst_localfileapi
+    SOURCES
+        tst_localfileapi.cpp
+    DEFINES
+        QT_NO_FOREACH
+        QT_NO_KEYWORDS
+    LIBRARIES
+        Qt::GuiPrivate
+    PUBLIC_LIBRARIES
+        Qt::Core
+        Qt::Gui
+        Qt::Widgets
+)
+
 qt_internal_add_test(tst_qstdweb
     SOURCES
         tst_qstdweb.cpp
diff --git a/tests/auto/wasm/tst_localfileapi.cpp b/tests/auto/wasm/tst_localfileapi.cpp
new file mode 100644
index 0000000000..0d17202d4b
--- /dev/null
+++ b/tests/auto/wasm/tst_localfileapi.cpp
@@ -0,0 +1,221 @@
+// Copyright (C) 2022 The Qt Company Ltd.
+// Copyright (C) 2016 Intel Corporation.
+// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GPL-3.0-only WITH Qt-GPL-exception-1.0
+
+#include <QtGui/private/qlocalfileapi_p.h>
+#include <QTest>
+#include <emscripten/val.h>
+
+class tst_LocalFileApi : public QObject
+{
+    Q_OBJECT
+
+private:
+    emscripten::val makeAccept(std::vector<emscripten::val> types) {
+        auto accept = emscripten::val::object();
+        accept.set("application/octet-stream",
+            emscripten::val::array(std::move(types)));
+        return accept;
+    }
+
+    emscripten::val makeType(QString description, std::vector<emscripten::val> acceptExtensions) {
+        using namespace emscripten;
+
+        auto type = val::object();
+        type.set("description", description.toStdString());
+
+        auto accept = val::object();
+        accept.set("application/octet-stream",
+            val::array(std::move(acceptExtensions)));
+        type.set("accept", makeAccept(std::move(acceptExtensions)));
+
+        return type;
+    }
+
+    emscripten::val makeOpenFileOptions(bool acceptMultiple, std::vector<emscripten::val> types) {
+        using namespace emscripten;
+
+        auto webFilter = val::object();
+        webFilter.set("types", val::array(std::move(types)));
+        if (!types.empty())
+            webFilter.set("excludeAcceptAllOption", val(true));
+        webFilter.set("multiple", val(acceptMultiple));
+
+        return webFilter;
+    }
+
+    emscripten::val makeSaveFileOptions(QString suggestedName, std::vector<emscripten::val> types) {
+        using namespace emscripten;
+
+        auto webFilter = val::object();
+        webFilter.set("suggestedName", val(suggestedName.toStdString()));
+        webFilter.set("types", val::array(std::move(types)));
+
+        return webFilter;
+    }
+
+private Q_SLOTS:
+    void fileExtensionFilterTransformation_data();
+    void fileExtensionFilterTransformation();
+    void acceptTransformation_data();
+    void acceptTransformation();
+    void typeTransformation_data();
+    void typeTransformation();
+    void openFileOptions_data();
+    void openFileOptions();
+    void saveFileOptions_data();
+    void saveFileOptions();
+};
+
+bool valDeepEquals(emscripten::val lhs, emscripten::val rhs)
+{
+    auto json = emscripten::val::global("JSON");
+    auto lhsAsJsonString = json.call<emscripten::val>("stringify", lhs);
+    auto rhsAsJsonString = json.call<emscripten::val>("stringify", rhs);
+
+    return lhsAsJsonString.equals(rhsAsJsonString);
+}
+
+void tst_LocalFileApi::fileExtensionFilterTransformation_data()
+{
+    QTest::addColumn<QString>("qtFileFilter");
+    QTest::addColumn<std::optional<std::string>>("expectedWebExtensionFilter");
+
+    QTest::newRow("PNG extension with an asterisk") << QString("*.png") << std::make_optional<std::string>(".png");
+    QTest::newRow("Long extension with an asterisk") << QString("*.someotherfile") << std::make_optional<std::string>(".someotherfile");
+    QTest::newRow(".dat with no asterisk") << QString(".dat") << std::make_optional<std::string>(".dat");
+    QTest::newRow("Multiple asterisks") << QString("*ot*.abc") << std::optional<std::string>();
+    QTest::newRow("Filename") << QString("abcd.abc") << std::optional<std::string>();
+    QTest::newRow("match all") << QString("*.*") << std::optional<std::string>();
+}
+
+void tst_LocalFileApi::fileExtensionFilterTransformation()
+{
+    QFETCH(QString, qtFileFilter);
+    QFETCH(std::optional<std::string>, expectedWebExtensionFilter);
+
+    auto result = LocalFileApi::Type::Accept::MimeType::Extension::fromQt(qtFileFilter);
+    if (expectedWebExtensionFilter) {
+        QCOMPARE_EQ(expectedWebExtensionFilter, result->asVal().as<std::string>());
+    } else {
+        QVERIFY(!result.has_value());
+    }
+}
+
+void tst_LocalFileApi::acceptTransformation_data()
+{
+    using namespace emscripten;
+
+    QTest::addColumn<QString>("qtFilterList");
+    QTest::addColumn<emscripten::val>("expectedWebType");
+
+    QTest::newRow("Multiple types") << QString("*.png *.other *.txt")
+        << makeAccept(std::vector<val> { val(".png"), val(".other"), val(".txt") });
+
+    QTest::newRow("Single type") << QString("*.png")
+        << makeAccept(std::vector<val> { val(".png") });
+
+    QTest::newRow("No filter when accepts all") << QString("*.*")
+        << val::undefined();
+
+    QTest::newRow("No filter when one filter accepts all") << QString("*.* *.jpg")
+        << val::undefined();
+
+    QTest::newRow("Weird spaces") << QString("    *.jpg     *.png *.icon  ")
+        << makeAccept(std::vector<val> { val(".jpg"), val(".png"), val(".icon") });
+}
+
+void tst_LocalFileApi::acceptTransformation()
+{
+    QFETCH(QString, qtFilterList);
+    QFETCH(emscripten::val, expectedWebType);
+
+    auto result = LocalFileApi::Type::Accept::fromQt(qtFilterList);
+    if (!expectedWebType.isUndefined()) {
+        QVERIFY(valDeepEquals(result->asVal(), expectedWebType));
+    } else {
+        QVERIFY(!result.has_value());
+    }
+}
+
+void tst_LocalFileApi::typeTransformation_data()
+{
+    using namespace emscripten;
+
+    QTest::addColumn<QString>("qtFilterList");
+    QTest::addColumn<emscripten::val>("expectedWebType");
+
+    QTest::newRow("With description") << QString("Text files (*.txt)")
+        << makeType("Text files", std::vector<val> { val(".txt") });
+
+    QTest::newRow("No description") << QString("*.jpg")
+        << makeType("", std::vector<val> { val(".jpg") });
+}
+
+void tst_LocalFileApi::typeTransformation()
+{
+    QFETCH(QString, qtFilterList);
+    QFETCH(emscripten::val, expectedWebType);
+
+    auto result = LocalFileApi::Type::fromQt(qtFilterList);
+    if (!expectedWebType.isUndefined()) {
+        QVERIFY(valDeepEquals(result->asVal(), expectedWebType));
+    } else {
+        QVERIFY(!result.has_value());
+    }
+}
+
+void tst_LocalFileApi::openFileOptions_data()
+{
+    using namespace emscripten;
+
+    QTest::addColumn<QStringList>("qtFilterList");
+    QTest::addColumn<bool>("multiple");
+    QTest::addColumn<emscripten::val>("expectedWebType");
+
+    QTest::newRow("Multiple files") << QStringList({"Text files (*.txt)", "Images (*.jpg *.png)", "*.bat"})
+        << true
+        << makeOpenFileOptions(true, { makeType("Text files", { val(".txt")}), makeType("Images", { val(".jpg"), val(".png")}), makeType("", { val(".bat")})});
+    QTest::newRow("Single file") << QStringList({"Text files (*.txt)", "Images (*.jpg *.png)", "*.bat"})
+        << false
+        << makeOpenFileOptions(false, { makeType("Text files", { val(".txt")}), makeType("Images", { val(".jpg"), val(".png")}), makeType("", { val(".bat")})});
+}
+
+void tst_LocalFileApi::openFileOptions()
+{
+    QFETCH(QStringList, qtFilterList);
+    QFETCH(bool, multiple);
+    QFETCH(emscripten::val, expectedWebType);
+
+    auto result = LocalFileApi::makeOpenFileOptions(qtFilterList, multiple);
+    QVERIFY(valDeepEquals(result, expectedWebType));
+}
+
+void tst_LocalFileApi::saveFileOptions_data()
+{
+    using namespace emscripten;
+
+    QTest::addColumn<QStringList>("qtFilterList");
+    QTest::addColumn<QString>("suggestedName");
+    QTest::addColumn<emscripten::val>("expectedWebType");
+
+    QTest::newRow("Multiple files") << QStringList({"Text files (*.txt)", "Images (*.jpg *.png)", "*.bat"})
+        << "someName1"
+        << makeSaveFileOptions("someName1", { makeType("Text files", { val(".txt")}), makeType("Images", { val(".jpg"), val(".png")}), makeType("", { val(".bat")})});
+    QTest::newRow("Single file") << QStringList({"Text files (*.txt)", "Images (*.jpg *.png)", "*.bat"})
+        << "some name 2"
+        << makeSaveFileOptions("some name 2", { makeType("Text files", { val(".txt")}), makeType("Images", { val(".jpg"), val(".png")}), makeType("", { val(".bat")})});
+}
+
+void tst_LocalFileApi::saveFileOptions()
+{
+    QFETCH(QStringList, qtFilterList);
+    QFETCH(QString, suggestedName);
+    QFETCH(emscripten::val, expectedWebType);
+
+    auto result = LocalFileApi::makeSaveFileOptions(qtFilterList, suggestedName.toStdString());
+    QVERIFY(valDeepEquals(result, expectedWebType));
+}
+
+QTEST_APPLESS_MAIN(tst_LocalFileApi)
+#include "tst_localfileapi.moc"