1 files changed, 122 insertions, 0 deletions
diff --git a/src/qmldom/qqmldomstringdumper_p.h b/src/qmldom/qqmldomstringdumper_p.h
new file mode 100644
index 0000000000..cf5c8e6483
--- /dev/null
+++ b/src/qmldom/qqmldomstringdumper_p.h
@@ -0,0 +1,122 @@
+// Copyright (C) 2020 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
+
+#ifndef DUMPER_H
+#define DUMPER_H
+
+//
+//  W A R N I N G
+//  -------------
+//
+// This file is not part of the Qt API.  It exists purely as an
+// implementation detail.  This header file may change from version to
+// version without notice, or even be removed.
+//
+// We mean it.
+//
+
+#include "qqmldom_global.h"
+#include "qqmldomconstants_p.h"
+#include "qqmldomfunctionref_p.h"
+
+#include <QtCore/QString>
+#include <QtCore/QStringView>
+#include <QtCore/QDebug>
+
+#include <type_traits>
+
+QT_BEGIN_NAMESPACE
+
+namespace QQmlJS {
+namespace Dom {
+
+using Sink = function_ref<void(QStringView)>;
+using SinkF = std::function<void(QStringView)>;
+using DumperFunction = std::function<void(const Sink &)>;
+
+class Dumper{
+public:
+    DumperFunction dumper;
+private:
+    // We want to avoid the limit of one user conversion:
+    // after doing (* -> QStringView) we cannot have QStringView -> Dumper, as it
+    // would be the second user defined conversion.
+    // For a similar reason we have a template to accept function_ref<void(Sink)> .
+    // The end result is that void f(Dumper) can be called nicely, and avoid overloads:
+    // f(u"bla"), f(QLatin1String("bla")), f(QString()), f([](const Sink &s){...}),...
+    template <typename T>
+    using if_compatible_dumper = typename
+    std::enable_if<std::is_convertible<T, DumperFunction>::value, bool>::type;
+
+    template<typename T>
+    using if_string_view_convertible = typename
+    std::enable_if<std::is_convertible_v<T, QStringView>, bool>::type;
+
+public:
+    Dumper(QStringView s):
+        dumper([s](const Sink &sink){ sink(s); }) {}
+
+    Dumper(std::nullptr_t): Dumper(QStringView(nullptr)) {}
+
+    template <typename Stringy, if_string_view_convertible<Stringy> = true>
+    Dumper(Stringy string):
+        Dumper(QStringView(string)) {}
+
+    template <typename U, if_compatible_dumper<U> = true>
+    Dumper(U f): dumper(std::move(f)) {}
+
+    void operator()(const Sink &s) const { dumper(s); }
+};
+
+template <typename T>
+void sinkInt(const Sink &s, T i) {
+    const int BUFSIZE = 42; // safe up to 128 bits
+    QChar buf[BUFSIZE];
+    int ibuf = BUFSIZE;
+    buf[--ibuf] = QChar(0);
+    bool neg = false;
+    if (i < 0)
+        neg=true;
+    int digit = i % 10;
+    i = i / 10;
+    if constexpr (std::is_signed_v<T>) {
+        if (neg) { // we change the sign here because -numeric_limits<T>::min() == numeric_limits<T>::min()
+            i = -i;
+            digit = - digit;
+        }
+    }
+    buf[--ibuf] = QChar::fromLatin1('0' + digit);
+    while (i > 0 && ibuf > 0) {
+        digit = i % 10;
+        buf[--ibuf] = QChar::fromLatin1('0' + digit);
+        i = i / 10;
+    }
+    if (neg && ibuf > 0)
+        buf[--ibuf] = QChar::fromLatin1('-');
+    s(QStringView(&buf[ibuf], BUFSIZE - ibuf -1));
+}
+
+QMLDOM_EXPORT QString dumperToString(const Dumper &writer);
+
+QMLDOM_EXPORT void sinkEscaped(const Sink &sink, QStringView s,
+                               EscapeOptions options = EscapeOptions::OuterQuotes);
+
+inline void devNull(QStringView) {}
+
+QMLDOM_EXPORT void sinkIndent(const Sink &s, int indent);
+
+QMLDOM_EXPORT void sinkNewline(const Sink &s, int indent = 0);
+
+QMLDOM_EXPORT void dumpErrorLevel(const Sink &s, ErrorLevel level);
+
+QMLDOM_EXPORT void dumperToQDebug(const Dumper &dumper, QDebug debug);
+
+QMLDOM_EXPORT void dumperToQDebug(const Dumper &dumper, ErrorLevel level = ErrorLevel::Debug);
+
+QMLDOM_EXPORT QDebug operator<<(QDebug d, const Dumper &dumper);
+
+} // end namespace Dom
+} // end namespace QQmlJS
+QT_END_NAMESPACE
+
+#endif // DUMPER_H