LibCore: Add Core::MimeData class

This object contains zero or more { mime_type, data } entries and will
be used for clipboard data as well as drag & drop.

Libraries/LibCore/Makefile

@@ -11,6 +11,7 @@ OBJS = \
     UdpSocket.o \
     UdpServer.o \
     ElapsedTimer.o \
+    MimeData.o \
     Notifier.o \
     HttpRequest.o \
     HttpResponse.o \

Libraries/LibCore/MimeData.cpp

@@ -0,0 +1,73 @@
+/*
+ * Copyright (c) 2020, Andreas Kling <kling@serenityos.org>
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice, this
+ *    list of conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ *    this list of conditions and the following disclaimer in the documentation
+ *    and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+ * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+ * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+ * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include <AK/StringBuilder.h>
+#include <LibCore/MimeData.h>
+
+namespace Core {
+
+Vector<String> MimeData::formats() const
+{
+    Vector<String> mime_types;
+    mime_types.ensure_capacity(m_data.size());
+    for (auto it : m_data)
+        mime_types.unchecked_append(it.key);
+    return mime_types;
+}
+
+Vector<URL> MimeData::urls() const
+{
+    auto it = m_data.find("text/uri-list");
+    if (it == m_data.end())
+        return {};
+    Vector<URL> urls;
+    for (auto& line : StringView(it->value).split_view('\n')) {
+        urls.append(URL(line));
+    }
+    return urls;
+}
+
+void MimeData::set_urls(const Vector<URL>& urls)
+{
+    StringBuilder builder;
+    for (auto& url : urls) {
+        builder.append(url.to_string());
+        builder.append('\n');
+    }
+    set_data("text/uri-list", builder.to_byte_buffer());
+}
+
+String MimeData::text() const
+{
+    return String::copy(m_data.get("text/plain").value_or({}));
+}
+
+void MimeData::set_text(const String& text)
+{
+    set_data("text/plain", text.to_byte_buffer());
+}
+
+}

Libraries/LibCore/MimeData.h

@@ -0,0 +1,64 @@
+/*
+ * Copyright (c) 2020, Andreas Kling <kling@serenityos.org>
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice, this
+ *    list of conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ *    this list of conditions and the following disclaimer in the documentation
+ *    and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+ * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+ * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+ * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#pragma once
+
+#include <AK/ByteBuffer.h>
+#include <AK/HashMap.h>
+#include <AK/URL.h>
+#include <LibCore/Object.h>
+
+namespace Core {
+
+class MimeData : public Object {
+    C_OBJECT(MimeData);
+
+public:
+    virtual ~MimeData() {}
+
+    ByteBuffer data(const String& mime_type) const { return m_data.get(mime_type).value_or({}); }
+    void set_data(const String& mime_type, const ByteBuffer& data) { m_data.set(mime_type, data); }
+
+    bool has_format(const String& mime_type) const { return m_data.contains(mime_type); }
+    Vector<String> formats() const;
+
+    // Convenience helpers for "text/plain"
+    bool has_text() const { return has_format("text/plain"); }
+    String text() const;
+    void set_text(const String&);
+
+    // Convenience helpers for "text/uri-list"
+    bool has_urls() const { return has_format("text/uri-list"); }
+    Vector<URL> urls() const;
+    void set_urls(const Vector<URL>&);
+
+private:
+    MimeData() {}
+
+    HashMap<String, ByteBuffer> m_data;
+};
+
+}