1 files changed, 141 insertions, 0 deletions
diff --git a/src/runtime/Qt3DSElementHelper.cpp b/src/runtime/Qt3DSElementHelper.cpp
new file mode 100644
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+++ b/src/runtime/Qt3DSElementHelper.cpp
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+/****************************************************************************
+**
+** Copyright (C) 1993-2009 NVIDIA Corporation.
+** Copyright (C) 2017 The Qt Company Ltd.
+** Contact: https://www.qt.io/licensing/
+**
+** This file is part of Qt 3D Studio.
+**
+** $QT_BEGIN_LICENSE:GPL$
+** 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 or (at your option) any later version
+** approved by the KDE Free Qt Foundation. The licenses are as published by
+** the Free Software Foundation and appearing in the file LICENSE.GPL3
+** 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.
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#include "RuntimePrefix.h"
+
+#include "Qt3DSElementHelper.h"
+#include "Qt3DSPresentation.h"
+#include "Qt3DSApplication.h"
+#include "Qt3DSCommandEventTypes.h"
+
+using namespace qt3ds;
+
+namespace Q3DStudio {
+
+const char PRESENTATION_DELIMITER = ':';
+const char NODE_DELIMITER = '.';
+const TStringHash RESERVED_THIS = CHash::HashString("this");
+const TStringHash RESERVED_PARENT = CHash::HashString("parent");
+const TStringHash RESERVED_SCENE = CHash::HashString("Scene");
+
+CElementHelper::CElementHelper()
+{
+}
+
+CElementHelper::~CElementHelper()
+{
+}
+
+TElement *CElementHelper::GetElement(qt3ds::runtime::IApplication &inApplication,
+                                     IPresentation *inDefaultPresentation, const char *inPath,
+                                     TElement *inStartElement)
+{
+    if (!inPath || *inPath == 0)
+        return nullptr;
+    const char *thePath(inPath);
+    const char *theSubPath = nullptr;
+    IPresentation *thePresentation = nullptr;
+    size_t thePathLength = ::strlen(thePath) + 1;
+    char *theToken = Q3DStudio_allocate_desc(CHAR, thePathLength, "Token:TempPath");
+    // Try to get the specified presentation
+    theSubPath = ::strchr(thePath, PRESENTATION_DELIMITER);
+    TElement *theElement = inStartElement;
+    if (theSubPath) {
+        UINT32 theSubPathLength = static_cast<UINT32>(theSubPath - thePath);
+
+        ::strncpy(theToken, thePath, theSubPathLength);
+        theToken[theSubPathLength] = '\0';
+
+        thePath = theSubPath + 1;
+
+        const CHAR *thePresentationName = theToken;
+
+        thePresentation = inApplication.GetPresentationById(thePresentationName);
+    }
+
+    if (!thePresentation)
+        thePresentation = inDefaultPresentation;
+
+    // Return nil if the inStartElement is not in the specified presentation
+    if (theElement
+            && (!theSubPath && theElement->GetBelongedPresentation() != thePresentation)) {
+        thePresentation = theElement->GetBelongedPresentation();
+    }
+
+    if (!thePresentation)
+        return nullptr;
+
+    TStringHash theName;
+    INT32 theParseCounter = 0;
+
+    while (thePath && thePath[0] != '\0') {
+        ++theParseCounter;
+
+        // Do some strtok() work here
+        theSubPath = ::strchr(thePath, NODE_DELIMITER);
+        if (theSubPath) {
+            UINT32 theSubPathLength = static_cast<UINT32>(theSubPath - thePath);
+            Q3DStudio_ASSERT(theSubPathLength < thePathLength);
+
+            ::strncpy(theToken, thePath, theSubPathLength);
+            theToken[theSubPathLength] = '\0';
+
+            thePath = theSubPath + 1;
+        } else {
+            ::strcpy(theToken, thePath);
+            thePath = nullptr;
+        }
+
+        // Hash the token and do some element searching
+        theName = CHash::HashString(theToken);
+
+        if (theName == RESERVED_PARENT) {
+            if (theElement)
+                theElement = theElement->GetParent();
+        } else if (theName == RESERVED_THIS) {
+            ;
+        } else {
+            if (theName == RESERVED_SCENE && theParseCounter == 1) {
+                // theElement is nullptr, so using absolute path
+                theElement = thePresentation->GetRoot();
+            } else if (theElement) {
+                // Using relative path
+                theElement = theElement->FindChild(theName);
+            }
+        }
+
+        if (!theElement)
+            thePath = nullptr;
+    } // while
+
+    Q3DStudio_free(theToken, CHAR, thePathLength);
+    return theElement;
+}
+} // namespace Q3DStudio