Method declarePythonVariables

Engine/Knob.cpp:2407–2510

}

std::string
KnobHelperPrivate::declarePythonVariables(bool addTab,
                                          int dim)
{
    if (!holder) {
        throw std::runtime_error("This parameter cannot have an expression");
    }

    std::string appID = holder->getApp()->getAppIDString();
    std::string tabStr = addTab ? "    " : "";
    EffectInstance* effect = dynamic_cast<EffectInstance*>(holder);
    NodeCollectionPtr collection;
    NodeGroup* isParentGrp = nullptr;
    if (effect) {
        NodePtr node = effect->getNode();
        assert(node);

        collection = node->getGroup();
        if (!collection) {
            throw std::runtime_error("This parameter cannot have an expression");
        }
        isParentGrp = dynamic_cast<NodeGroup*>( collection.get() );
    }
    std::stringstream ss;
    if (appID != "app") {
        ss << tabStr << "app = " << appID << "\n";
    }


    //Define all nodes reachable through expressions in the scope


    //Define all nodes in the same group reachable by their bare script-name
    std::string collectionScriptName;
    if (isParentGrp) {
        collectionScriptName = isParentGrp->getNode()->getFullyQualifiedName();
    } else {
        collectionScriptName = appID;
    }
    if (collection) {
        NodesList siblings = collection->getNodes();
        for (NodesList::iterator it = siblings.begin(); it != siblings.end(); ++it) {
            if ( (*it)->isActivated() && !(*it)->getParentMultiInstance() ) {
                std::string scriptName = (*it)->getScriptName_mt_safe();
                if ( NATRON_PYTHON_NAMESPACE::isKeyword(scriptName) ) {
                    throw std::runtime_error(scriptName + " is a Python keyword");
                }
                std::string fullName = appID + "." + (*it)->getFullyQualifiedName();
                ss << tabStr << "if hasattr(";
                if (isParentGrp) {
                    ss << appID << ".";
                }
                ss << collectionScriptName << ",\"" <<  scriptName << "\"):\n";

                ss << tabStr << "    " << scriptName << " = " << fullName << "\n";
            }
        }
    }