Clang: Introduce UnsavedFile wrapper

This simplifies UnsavedFiles and makes TemporaryModifiedUnsavedFiles
useless.

Change-Id: I1896f971215ed22ce7aa7bf21b16381862b7469d
Reviewed-by: Marco Bubke <marco.bubke@theqtcompany.com>

src/tools/clangbackend/ipcsource/unsavedfile.cpp

@@ -0,0 +1,104 @@
+/****************************************************************************
+**
+** Copyright (C) 2016 The Qt Company Ltd.
+** Contact: https://www.qt.io/licensing/
+**
+** This file is part of Qt Creator.
+**
+** Commercial License Usage
+** Licensees holding valid commercial Qt licenses may use this file in
+** accordance with the commercial license agreement provided with the
+** Software or, alternatively, in accordance with the terms contained in
+** a written agreement between you and The Qt Company. For licensing terms
+** and conditions see https://www.qt.io/terms-conditions. For further
+** information use the contact form at https://www.qt.io/contact-us.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU
+** General Public License version 3 as published by the Free Software
+** Foundation with exceptions as appearing in the file LICENSE.GPL3-EXCEPT
+** included in the packaging of this file. Please review the following
+** information to ensure the GNU General Public License requirements will
+** be met: https://www.gnu.org/licenses/gpl-3.0.html.
+**
+****************************************************************************/
+
+#include "unsavedfile.h"
+
+#include "utf8string.h"
+
+#include <cstring>
+#include <ostream>
+
+namespace ClangBackEnd {
+
+UnsavedFile::UnsavedFile(const Utf8String &filePath, const Utf8String &fileContent)
+{
+    char *cxUnsavedFilePath = new char[filePath.byteSize() + 1];
+    char *cxUnsavedFileContent = new char[fileContent.byteSize() + 1];
+
+    std::memcpy(cxUnsavedFilePath, filePath.constData(), filePath.byteSize() + 1);
+    std::memcpy(cxUnsavedFileContent, fileContent.constData(), fileContent.byteSize() + 1);
+
+    cxUnsavedFile = CXUnsavedFile{cxUnsavedFilePath,
+                                  cxUnsavedFileContent,
+                                  ulong(fileContent.byteSize())};
+}
+
+UnsavedFile::UnsavedFile(UnsavedFile &&other) noexcept
+    : cxUnsavedFile(other.cxUnsavedFile)
+{
+    other.cxUnsavedFile = { nullptr, nullptr, 0UL };
+}
+
+UnsavedFile &UnsavedFile::operator=(UnsavedFile &&other) noexcept
+{
+    using std::swap;
+
+    swap(this->cxUnsavedFile, other.cxUnsavedFile);
+
+    return *this;
+}
+
+const char *UnsavedFile::filePath() const
+{
+    return cxUnsavedFile.Filename;
+}
+
+bool UnsavedFile::replaceAt(uint position, uint length, const Utf8String &replacement)
+{
+    if (position < cxUnsavedFile.Length) {
+        Utf8String modifiedContent(cxUnsavedFile.Contents, cxUnsavedFile.Length);
+        modifiedContent.replace(int(position), int(length), replacement);
+
+        *this = UnsavedFile(Utf8String::fromUtf8(filePath()), modifiedContent);
+
+        return true;
+    }
+
+    return false;
+}
+
+CXUnsavedFile *UnsavedFile::data()
+{
+    return &cxUnsavedFile;
+}
+
+UnsavedFile::~UnsavedFile()
+{
+    delete [] cxUnsavedFile.Contents;
+    delete [] cxUnsavedFile.Filename;
+    cxUnsavedFile.Contents = nullptr;
+    cxUnsavedFile.Filename = nullptr;
+    cxUnsavedFile.Length = 0;
+}
+
+void PrintTo(const UnsavedFile &unsavedFile, std::ostream *os)
+{
+    *os << "UnsavedFile("
+           << unsavedFile.cxUnsavedFile.Filename << ", "
+           << unsavedFile.cxUnsavedFile.Contents << ", "
+           << unsavedFile.cxUnsavedFile.Length << ")";
+}
+
+} // namespace ClangBackEnd