1 files changed, 97 insertions, 0 deletions
diff --git a/src/corelib/kernel/qcore_wasm.cpp b/src/corelib/kernel/qcore_wasm.cpp
new file mode 100644
index 0000000000..fb12ae50c3
--- /dev/null
+++ b/src/corelib/kernel/qcore_wasm.cpp
@@ -0,0 +1,97 @@
+// 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 <QtCore/qrect.h>
+
+#include <emscripten/val.h>
+
+#if !defined(Q_OS_WASM)
+#error This is a wasm-only file.
+#endif // !defined(Q_OS_WASM)
+
+QT_BEGIN_NAMESPACE
+
+/*!
+    Converts the DOMRect (https://www.w3.org/TR/geometry-1/) \a domRect to QRectF. The behavior is
+    undefined if the provided parameter is not a DOMRect.
+
+    \since 6.5
+    \ingroup platform-type-conversions
+
+    \sa toDOMRect()
+*/
+QRectF QRectF::fromDOMRect(emscripten::val domRect)
+{
+    Q_ASSERT_X(domRect["constructor"]["name"].as<std::string>() == "DOMRect", Q_FUNC_INFO,
+               "Passed object is not a DOMRect");
+
+    return QRectF(domRect["left"].as<qreal>(), domRect["top"].as<qreal>(),
+                  domRect["width"].as<qreal>(), domRect["height"].as<qreal>());
+}
+
+/*!
+    Converts this object to a DOMRect (https://www.w3.org/TR/geometry-1/).
+
+    \since 6.5
+    \ingroup platform-type-conversions
+
+    \sa fromDOMRect()
+*/
+emscripten::val QRectF::toDOMRect() const
+{
+    return emscripten::val::global("DOMRect").new_(left(), top(), width(), height());
+}
+
+/*!
+    Converts the \l {https://262.ecma-international.org/#sec-string-object}{ECMAScript string} \a
+    jsString to QString. Behavior is undefined if the provided parameter is not a string.
+
+    \since 6.6
+    \ingroup platform-type-conversions
+
+    \sa toEcmaString()
+*/
+QString QString::fromEcmaString(emscripten::val jsString)
+{
+    Q_ASSERT_X(jsString.isString(), Q_FUNC_INFO, "Passed object is not a string");
+
+    const double length = jsString["length"].as<double>();
+
+    Q_ASSERT_X((double(uint64_t(length)) != double(uint64_t(length) - 1)
+                && double(uint64_t(length)) != double(uint64_t(length) + 1))
+                       || !std::numeric_limits<double>::is_iec559,
+               Q_FUNC_INFO, "The floating-point length cannot precisely represent an integer");
+
+    constexpr int zeroTerminatorLength = 1;
+    const auto lengthOfUtf16 = (length + zeroTerminatorLength) * 2;
+
+    Q_ASSERT_X((double(uint64_t(lengthOfUtf16)) != double(uint64_t(lengthOfUtf16) - 1)
+                && double(uint64_t(lengthOfUtf16)) != double(uint64_t(lengthOfUtf16) + 1))
+                       || !std::numeric_limits<double>::is_iec559,
+               Q_FUNC_INFO,
+               "The floating-point lengthOfUtf16 cannot precisely represent an integer");
+
+    const QString result(uint64_t(length), Qt::Uninitialized);
+
+    static const emscripten::val stringToUTF16(emscripten::val::module_property("stringToUTF16"));
+    stringToUTF16(jsString, emscripten::val(quintptr(result.data())),
+                  emscripten::val(lengthOfUtf16));
+    return result;
+}
+
+/*!
+    Converts this object to an
+    \l {https://262.ecma-international.org/#sec-string-object}{ECMAScript string}.
+
+    \since 6.6
+    \ingroup platform-type-conversions
+
+    \sa fromEcmaString()
+*/
+emscripten::val QString::toEcmaString() const
+{
+    static const emscripten::val UTF16ToString(emscripten::val::module_property("UTF16ToString"));
+    return UTF16ToString(emscripten::val(quintptr(utf16())));
+}
+
+QT_END_NAMESPACE