OP_Director.h

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/*
 * PROPRIETARY INFORMATION.  This software is proprietary to
 * Side Effects Software Inc., and is not to be reproduced,
 * transmitted, or disclosed in any way without written permission.
 *
 * NAME:        OP Library (C++)
 *
 * COMMENTS:
 *      The OP_Director class is a collection (network) of managers.
 *      The Managers register themselves with an active OP_Director
 *      when they are created. The active OP_Director is obtained
 *      via the global function (yuch) OPgetDirector().
 *
 */

#ifndef __OP_Director_h__
#define __OP_Director_h__

#include "OP_API.h"
#include "OP_CommandManager.h"
#include "OP_Network.h"
#include "OP_Node.h"
#include "OP_OTLManager.h"
#include "OP_OperatorTable.h"
#include "OP_ConnectorId.h"
#include <CH/CH_Manager.h>
#include <UT/UT_ColorTable.h>
#include <UT/UT_IntArray.h>
#include <UT/UT_NonCopyable.h>
#include <UT/UT_Thread.h>
#include <UT/UT_ThreadSpecificValue.h>
#include <UT/UT_Tuple.h>
#include <UT/UT_ValArray.h>
#include <SYS/SYS_Types.h>
#include <iosfwd>
#include <time.h>

#define OP_POSTLOAD_SCRIPT      "456.cmd"

// This name cannot change because it's saved to .hip files.
// See also HOM_SESSION_MODULE_NAME
#define OP_HOM_SESSION_MODULE_CPIO_NAME ".hou.session"

class UT_WorkArgs;
class UT_WorkBuffer;
class UT_Args;
class OP_SaveCallback;
class OP_Input;
class OP_ExprFunc;
class op_ShopClerkInfo;
class OP_BundleList;
class OP_StyleManager;
class OP_Take;
class OP_FileResolver;
class OP_GlobContext;
class PI_EditScriptedParms;
class PRM_ScriptPage;
class UT_Obfuscator;
class OP_EventScriptPathCache;

typedef void (*OP_GlobalOpChangedCallback)(OP_Node *node, OP_EventType reason,
                                           void *data, void *cbdata);
typedef UT_ValArray<OP_GlobalOpChangedCallback> OP_GlobalOpChangedCallbacks;

enum class OP_OrientationMode
{
    Y_UP,
    Z_UP
};

class OP_API OP_Director : public OP_Network, public OP_OTLManagerSink
{
public:    
    enum EventType
    {
        BEGIN_CLEAR_NETWORK,
        END_CLEAR_NETWORK,
        BEGIN_LOAD_NETWORK,
        END_LOAD_NETWORK,
        BEGIN_MERGE_NETWORK,
        END_MERGE_NETWORK,
        BEGIN_SAVE_NETWORK,
        END_SAVE_NETWORK,
        NUM_NETWORK_EVENT_TYPES,
    };
    typedef void (*EventCallback)(EventType type, void *);
    typedef OP_ERROR (*SaveCallback)(std::ostream &, void *);
    
public:
             OP_Director(const UT_StringHolder &name, const fpreal32 version);
            ~OP_Director() override;

    OP_OpTypeId          getOpTypeID() const override
                            { return DIR_OPTYPE_ID; }
    const char          *getOpType() const override
                            { return DIR_OPTYPE_NAME; }
    OP_DataType          getCookedDataType() const override
                            { return OP_NO_DATA; }
    void                *getCookedData(const OP_Context &) override
                            { return nullptr; }
    void                 deleteCookedData() override
                            { }
    int                  saveCookedData(
                                std::ostream &, OP_Context &, int = 0) override
                            { return 1; }
    bool                 loadCookedData(UT_IStream &,
                                        const char * = nullptr) override
                            { return true; }
    int                  saveCookedData(const char *, OP_Context &) override
                            { return 1; }
    OP_OpTypeId          getChildTypeID() const override
                            { return MGR_OPTYPE_ID; }
    const char          *getChildType() const override
                            { return MGR_OPTYPE_NAME; }

    OP_Network          *getManager(const char *name) const;
    CH_Manager          *getChannelManager() { return &myCommandManager; }
    OP_CommandManager   *getCommandManager() { return &myCommandManager; }
    fpreal32             getVersion() const { return myVersion; }

    // NB: clearNetwork() will always reload the channel manager options!
    //     However, the user is responsible as to when we save them
    bool                 loadChannelManagerOptions();
    bool                 saveChannelManagerOptions();

    /// Export the active bookmarks to a file
    bool                 saveBookmarks(const UT_StringHolder &filename,
                                       bool include_temporary=false);
    /// Export only the given bookmarks to a file
    bool                 saveBookmarks(const UT_StringHolder &filename,
                                       const UT_Array<CH_Bookmark *> &bookmarks);
    /// Load the saved bookmarks, setting them as active
    bool                 loadBookmarks(const UT_StringHolder &filename,
                                       bool remove_existing = true);

    virtual void         enable(int state);

    OP_ERROR             saveNetwork(std::ostream &os, 
                                     const OP_SaveFlags &options);
    bool                 loadNetwork(UT_IStream &is, int merge=0,
                                     const char *merge_pattern=nullptr,
                                     int overwrite=0);
    void                 initializeManagerWireStyles();
    virtual void         clearNetwork( int clear_aliases );

    // This will go through the entire hip file and cook all the CHOPs
    // that have their export flags set and cook them with CookOverride
    // turned on.
    virtual void         opUpdateAllExports();

    void                 setOldCHOPOverrideFlag() 
                         { myOldCHOPOverrideFlag = true; }
    bool                 getOldCHOPOverrideFlag() 
                         { return myOldCHOPOverrideFlag; }
    void                 clearOldCHOPOverrideFlag() 
                         { myOldCHOPOverrideFlag = false; }

    /// Create an evaluation context scope with a new node
    class CwdScope;

    OP_Node             *getCwd()
                            { return getCwd(SYSgetSTID()); }
    void                 getCwd(UT_String &str)
                            { getCwd(SYSgetSTID(), str); }

    OP_Node             *getCwd(int thread);
    void                 getCwd(int thread, UT_String &str);
    void                 setCwd(int thread, const OP_Node *node,
                                int eval_collection=-1);

    // pushCwd() pushes the current cwd onto a stack that can later be restored
    // using popCwd(). The optional new_cwd parameter sets the cwd to it at
    // the same time.
    void                 pushCwd(int thread, const OP_Node *new_cwd = nullptr);
    void                 popCwd(int thread);

    int                  getCwdStackSize(int thread) const
                         {
                            return myCwdContext.getValueForThread(thread)
                                    .myCwdStack.size();
                         }

    void                 setEditNetworkUI(OP_Network *net);

    bool                 getPickedNodes(OP_NodeList &picked_nodes,
                                bool include_hidden=false,
                                bool append_to_list=false) const;
    bool                 getPickedItems(OP_NetworkBoxItemList &picked_items,
                                bool include_hidden=false) const;
    bool                 getPickedInputs(
                                UT_Array<OP_Input *> &picked_inputs) const;
    OP_Node             *getLastPickedNode(OP_Node *parent = nullptr) const;
    const OP_ItemIdList &getPickedItemIds() const;

    void                 clearPickedItems();

    // Pick the given item, clearing all other picked items first. This is here
    // so that we can prevent an extra undo if the current state already
    // matches what we want.
    void                 makeOnlyPickedCurrent(OP_NetworkBoxItem &item);

    // These next 3 methods should only be called from OP_Node::setPicked()
    // The myPickedItems array can't contain duplicates and maintains the
    // invariant that:
    // - node.getPicked() is TRUE iff it is in the list.
    // - node.getPicked() is FALSE implies that it is NOT in the list.
    void                 addPickedNode(const OP_Node &node, bool edit);
    void                 removePickedNode(const OP_Node &node, bool edit);
    void                 makePickedNodeLast(const OP_Node &node, bool edit);

    // These methods should only be called from the various
    // setPicked() functions in OP_NetworkBoxItem subclasses. The
    // myPickedXXXIds arrays can't contain duplicates and maintain the
    // invariant that:
    // - item.getPicked() is TRUE iff it is in the list.
    // - item.getPicked() is FALSE implies that it is NOT in the list.
    void                 addPickedItem(const OP_NetworkBoxItem &item);
    void                 removePickedItem(const OP_NetworkBoxItem &item);
    void                 itemBeingDeleted(const OP_NetworkBoxItem &item);

    // These methods should only be called from OP_Input::setPicked(). The
    // myPickedXXXIds arrays can't contain duplicates and maintain the
    // invariant that:
    // - input.getPicked() is TRUE iff it is in the list.
    // - input.getPicked() is FALSE implies that it is NOT in the list.
    void                 addPickedInput(const OP_Input &input);
    void                 removePickedInput(const OP_Input &input);

    // Control time.
    void                 setTime(fpreal time);
    fpreal               getTime() const;

    /// Set the number of frames, adjusting the ending frame appropriately.
    void setNFrames(fpreal nframes, bool notify = true);

    void setChopMotionSamples(int n, bool notify = true);

    /// Set the frame rate
    /// @param fps The new samples per second
    /// @param modify_frame_count Whether or not to scale the frame count to
    /// preserve animation time duration (default = true)
    /// @param preserve_keyframes If true, keeps keys on their existing
    /// frames, changing the speed of the animation.
    /// @param preserve_frame_start If true, will adjust the time of the start
    /// time to ensure the corresponding frame is preserved
    /// If modify_frame_count is false, the end frame will also be preserved.
    /// @param notify Whether or not to trigger OP Node and varchange events
    /// (default = true)
    void setSamplesPerSec(
            fpreal fps,
            bool modify_frame_count = true,
            bool preserve_keyframes = false,
            bool preserve_frame_start = false,
            bool notify = true);

    /// Set global start and end times
    /// @note t_end refers to the STARTING time of the final frame
    /// To set the END of the final frame, use setTimeRange instead
    void setGlobalTime(fpreal t_start, fpreal t_end, bool notify = true);

    /// Set global start and end times
    /// @note t_end refers to the ENDING time of the final frame
    /// To set the START of the final frame, use setGlobalTime instead
    void setTimeRange(fpreal t_start, fpreal t_end, bool notify = true);

    /// Set the frames shown in the playbar.
    /// @note these frames are a subset of the global frame range, which is
    /// controlled by setTimeRange/setGlobalTime
    void setSampleRange(fpreal frame_start, fpreal fend, bool notify = true);

    /// The save callback is called when saving .hip files. It is called with
    /// a stream reference to the .hip file so that the callback can insert
    /// hscript commands into the .hip file's .application section. When a
    /// .hip file is loaded, all the commands in the .application section are
    /// executed.
    // @{
    void                 setSaveCallback(SaveCallback cb, void *cb_data);
    void                 removeSaveCallback(SaveCallback cb, void *cb_data);

    /// Callbacks for certain global OP_Director events, such as new scene 
    /// and load scene.
    void                 addEventCallback(EventType type, EventCallback cb, 
                                          void *data);
    void                 removeEventCallback(EventType type, EventCallback cb,
                                          void *data);
    // @}

    void                 setUserDisplayOptionSaveCallback(
                                OP_ERROR (*cb)(std::ostream &, void *),
                                void *callback_data);
    void                 setSceneFileVisualizersSaveCallback(
                                OP_ERROR (*cb)(std::ostream &, void *),
                                void *callback_data);
    void                 addBadLoadData(char *str, int len);

    int                  isLoading() const  { return (myInLoadCount > 0); }
    virtual void         beginLoading();
    virtual void         endLoading();
    bool                 getIsLoadingHip() const
                         { return myIsLoadingHip; }
    bool                 getIsQuitting() const
                         { return myIsQuitting; }
    void                 setIsDoingExplicitSave(bool value)
                         { myIsDoingExplicitSave = value; }
    bool                 getIsDoingExplicitSave() const
                         { return myIsDoingExplicitSave; }
    const OP_Node       *getAnyCookingNode() const;

    bool                 getIsMantra() const
                         { return myIsMantra; }
    void                 setIsMantra(bool v)
                         { myIsMantra = v; }
    bool                 getIsClearing() const
                         { return myIsClearing; }

    void                 destroyFileResolver();

    void                 beginTakeSwitch();
    void                 endTakeSwitch();
    bool                 isSwitchingTake() const
                            { return mySwitchingTake; }

    int                  renameNode(OP_Node *, const char *, 
                                    OP_RenameAction) override;

    // These methods are only called by the network load/save
    void                 saveChannelGroups(std::ostream &os, int binary);
    bool                 loadChannelGroups(UT_IStream &is, const char *path);
    void                 saveTimeGroups(std::ostream &os, int binary);
    bool                 loadTimeGroups(UT_IStream &is, const char *path);
    void                 saveBookmarks(std::ostream &os, int binary);
    bool                 loadBookmarks(UT_IStream &is);
    void                 saveScriptedOpLibrary(std::ostream &os);
    bool                 loadScriptedOpLibrary(UT_IStream &is, time_t modtime);
    bool                 loadScriptedOpDefs(UT_IStream &is);
    void                 saveInternalOpLibraries(std::ostream &os);
    bool                 loadInternalOpLibraries(UT_IStream &is);
    void                 saveLibraryPreferences(std::ostream &os);
    bool                 loadLibraryPreferences(UT_IStream &is);
    void                 saveUnselectedFilePatterns(std::ostream &os);
    bool                 loadUnselectedFilePatterns(UT_IStream &is);

    virtual void         clearHOMSessionModuleSource() { }
    virtual void         saveHOMSessionModuleSource(std::ostream &os) { }
    virtual bool         loadHOMSessionModuleSource(UT_IStream &is) { return true; }

    void                 saveOTLBackupInformation(std::ostream &os);

    OP_ExprFunc         *getExprFunctions();
    void                 saveExprFunctions(std::ostream &os);
    bool                 loadExprFunctions(UT_IStream &is, const char *path);

    OP_BundleList       *getBundles()   { return myBundles; }

    // These track the current update mode: Should an OP recook?
    int                  cookEnabled() const
                         { return myCookEnabled; }
    void                 setCookEnabled(int state)
                         { myCookEnabled = state; }

    // These track the simulation update mode: Should simulations cook?
    int                  simulationEnabled() const
                         { return mySimulationEnabled; }
    void                 setSimulationEnabled(int state)
                         { mySimulationEnabled = state; }

    // These control whether those simulations reset by output drivers should
    // reset based on the global or playback playbar range.
    bool                 skipPlaybarBasedSimulationReset() const
                            { return mySkipPlaybarBasedSimulationReset > 0; }
    void                 bumpSkipPlaybarBasedSimulationReset(int inc)
                            { mySkipPlaybarBasedSimulationReset += inc; }

    // These methods are used by SHOPs to keep track of visible clerks.
    bool                 addShopClerk(const char *type);
    int                  getNShopClerks() const
                         { return myShopInfo.entries(); }
    const char          *getShopClerkName(int clerk) const;
    int                  getShopClerkVisibility(int clerk) const;
    void                 setShopClerkVisibility(int clerk, int onoff);
    bool                 isCompiledLibrary (OP_OTLLibrary *lib);

    // This function does nothing at this level, but it is meant to be
    // overridden to create new OP_OperatorInfos for the given table based
    // on the existance of VOP networks.
    virtual void         findInternalScriptOperators(
                                const char * /* indexPath */,
                                OP_OTLDefinitionArray & /* defs */)
                         { }
    virtual OP_Node     *linkInternalScriptOperator(
                                const char * /* definitionOp */,
                                OP_Operator * /* op */)
                         { return nullptr; }
    virtual void         getInternalScriptDefinition(
                                OP_Node * /* definitionOp */,
                                UT_String & /* definition */)
                         { }
    virtual void         updateExportedParms(
                                OP_Node * /* definitionOp */)
                         { }
    // Save the spare parameters section for the specified node. We have
    // to do this through a virtual function that is actually implemented
    // in the MOT library because it requires the PI_EditScriptedParms
    // class.
    virtual OP_ERROR     saveNodeSpareParms(OP_Parameters *,
                                            bool,
                                            std::ostream &) const
                         { return UT_ERROR_NONE; }
    // Load the spare parms section for a node. Although it doesn't require
    // the PI library, this function is also implemented in the MOT library
    // just to keep the save and load code paths in a similar location.
    virtual bool         loadNodeSpareParms(OP_Parameters *,
                                            UT_IStream &,
                                            UT_String &) const
                         { return true; }
    // Adds a single spare parm to the specified node. This function exists
    // for backward compatibility with spare parms from H8. This function is
    // implemented in the MOT library where we have access to the PI classes
    // for editing parms (PI_EditScriptedParms).
    virtual bool         addNodeSpareParm(OP_Parameters * /*node*/,
                                          PRM_Template * /*parmtemplate*/) const
                         { return false; }
    // Removes a single spare parm to the specified node. This function exists
    // for backward compatibility with spare parms from H8. This function is
    // implemented in the MOT library where we have access to the PI classes
    // for editing parms (PI_EditScriptedParms).
    virtual bool         removeNodeSpareParm(OP_Parameters *node,
                                             const char *parmname,
                                             UT_StringArray *errs = nullptr,
                                             UT_StringArray *warn = nullptr
                                             ) const
                         { return false; }
    // Updates the spare parms of a node to match the supplied
    // PI_EditScriptedParms. This class isn't defined until the PI
    // library, so this function is actually implemented in MOT_Director.
    virtual void         changeNodeSpareParms(OP_Parameters *,
                                              PI_EditScriptedParms &,
                                              UT_String &) const
                         { }
    // Save a series of hscript commands to a stream to replicate the
    // spare parameters of the specified node.
    virtual void         saveNodeSpareParmCommands(OP_Parameters *,
                                                   std::ostream &,
                                                   const char *,
                                                   bool) const
                         { }
    // Delete spare parameter/base parameter mixing layout. This puts the
    // spare parameters on their own page.
    virtual void         deleteNodeSpareParmLayout(OP_Parameters *) const
                         { }
    // Delete all spare parameters on a node.
    virtual void         deleteAllNodeSpareParms(OP_Parameters *) const
                         { }

    virtual PRM_ScriptPage      *allocateSpareScriptPage(OP_Operator *)
                         { return nullptr; }

    // Functions for saving and loading compiled VEX and RSL code for nodes
    // with VOP_CodeGenerators in a compiled hip file.
    virtual void         saveNodeCompiledCode(OP_Node *, std::ostream &, 
                                bool is_source_code = false)
                         { }
    virtual bool         loadNodeCompiledCode(OP_Node *, UT_IStream &,
                                bool is_source_code = false)
                         { return true; }
    virtual void         saveNodeCompiledDs(OP_Node *, std::ostream &)
                         { }
    virtual bool         loadNodeCompiledDs(OP_Node *, UT_IStream &)
                         { return true; }

    OP_Take             *getTakeManager()       { return myTakeManager; }
    OP_StyleManager     *getStyleManager()      { return myStyleManager; }
    UT_ColorTable       &getGroupColorTable()   { return myGroupColorTable; }

        // deprecated method: interest gets cleared out before every cook
    void                 addExtraInput(OP_Node *op,
                                       OP_InterestType type) override;

    // A utility function to glob (pattern expand) all arguments on a command
    // line.
    static int           globAllArguments(OP_Node *node, UT_Args &args,
                                          UT_WorkBuffer &workbuf,
                                          UT_WorkArgs &argv,
                                          OP_ItemTypeMask item_type,
                                          OP_GlobContext *context,
                                          int startitem = 1);

    // This function is similar to the one above, except it takes a string
    // pattern (which may contain spaces) and returns an array of matching
    // nodes and/or netboxes.
    static void          globAllArgumentsAsArray(OP_Node &relative_to_node,
                                    const char *pattern,
                                    OP_ItemTypeMask item_type,
                                    OP_GlobContext &glob_context,
                                    UT_ValArray<OP_NetworkBoxItem *> &result);

    // These functions are the instantiations of the virtual functions
    // from our OP_OTLManagerSink base class.
    void                 definitionsAdded(int libindex,
                                          UT_IntArray &defindex) override;
    void                 definitionsRemoved(int libindex,
                                            UT_IntArray &defindex,
                                            OP_OTLLibrary *&preserve) override;

    // Given a path of the form "tablename/opname", return the table and
    // operator indicated by the path. The relativetonode parm is used when
    // the path is actualy a node path, and we want the table and operator
    // of the node specified by the path. If it is a relative path, the
    // relativetonode is the starting point. If it is null, the current
    // working node is used, or the director.
    void                 getTableAndOperator(
                                const char *path,
                                OP_OperatorTable *&table,
                                OP_Operator *&op,
                                const OP_Node *relativetonode = nullptr);
    OP_OTLManager       &getOTLManager()
                         { return myOTLManager; }
    const OP_OTLManager &getOTLManager() const
                         { return myOTLManager; }

    // This function should be called right before exiting. It will go
    // through all OP_Operators with active nodes and run the POSTLASTDELETE
    // event script (though it doesn't actually delete the nodes).
    void                 runDeleteScriptsOnQuit();

    // Add or remove callback functions that get executed whenever we call
    // OP_Node::opChanged.
    void                 addGlobalOpChangedCallback(
                            OP_GlobalOpChangedCallback cb, void *cbdata);
    void                 removeGlobalOpChangedCallback(
                            OP_GlobalOpChangedCallback cb, void *cbdata);
    // This function is called any time OP_Node::opChanged is called. It sends
    // the change information along to any global op change callback functions
    // that have been registered by addGlobalOpChangeCallback.
    void                 globalOpChanged(OP_Node *node,
                                         OP_EventType reason,
                                         void *data);

    // This function creates a backup of the specified file, if the option
    // to save backup files is turned on. The actual file name and file type
    // are irrelevent. It returns true if the backup was successful (or was
    // not required).
    static bool          createBackupFile(const char *filename,
                                          bool domove= false);
    // This function will rename the current file "filename" to the next
    // filename in the sequence to free up "filename" so that it can be
    // saved over. If successful, it will store the new filename in
    // "newfilename". Otherwise, "newfilename" will be an empty string.
    static void          autoIncrementRename(const char *filename,
                                             UT_String &newfilename,
                                             UT_String &errorstring,
                                             bool movefile,
                                             bool autosave);

    void                 runScript(CMD_Manager *cman, const char *filename);
    UT_Tuple<bool, int>  runPython(CMD_Manager *cman, const char *filename);
    UT_Tuple<bool, int>  runPython(CMD_Manager *cman, int argc,
                                      char *argv[]);
    UT_Tuple<bool, int>  runDefaultStartupScripts(CMD_Manager *cman, 
                                        const char *startup_script,
                                        const char *postload_script);

    // Get the global (i.e. non-operator specific) script path cache.
    OP_EventScriptPathCache     *getGlobalEventScriptPathCache()
                                    { return myGlobalEventScriptPathCache; }

    // Clear all cached paths to global event scripts.
    void                         clearGlobalEventScriptPathCache();

    // Query all cached global event script paths.
    void                         getCachedGlobalEventScriptPaths(
                                                UT_StringArray &events,
                                                UT_StringArray &paths,
                                                bool only_nonempty) const;

    // Because of code complexity issues, this method must be used to destruct
    // an OP_Director.
    static void destroyDirector(OP_Director *opdir);

    bool                         getSaveSceneAsText() const;
    void                         setSaveSceneAsText(bool on_off);
    bool                         getNewFileSaveSceneAsText() const;
    void                         setNewFileSaveSceneAsText(bool on_off);

    /// Run callbacks for before saving a scene,
    /// 'autosave' indicates if the save was triggered by the autosave timer.
    void                         notifyBeforeSceneSave(
                                        const UT_StringHolder &filename,
                                        bool autosave);
    /// Run callbacks for before saving a scene,
    /// 'autosave' indicates if the save was triggered by the autosave timer.
    /// 'did_succeed' indicates if the save was successful.
    void                         notifyAfterSceneSave(
                                        const UT_StringHolder &filename,
                                        bool autosave,
                                        bool did_succeed);

    using OrientationMode = OP_OrientationMode;

    OrientationMode              getOrientationMode() const
                                    { return myOrientationMode; }
    void                         setOrientationMode(OrientationMode axis)
                                    { myOrientationMode = axis; }

    static UT_Obfuscator        *getObfuscator();

protected:
    OP_ERROR             cookMe(OP_Context &) override
                         { return UT_ERROR_NONE; }
    OP_ERROR             bypassMe(OP_Context &, int &) override
                         { return UT_ERROR_NONE; }
    const char          *getFileExtension(int binary) const override
                         { return binary ? ".bhip" : ".hip"; }
    void                 clearUnsupportedCommands() const;

    // This function is called when we update our OTL for an operator. It
    // does nothing at this level, but in MOT it will clear out the PI
    // settings that have been saved for the specified operator type.
    virtual void         clearHandleSettings(OP_Operator *) { }

    // We don't allow spare parms on the director, so just ignore this call.
    bool                 changeSpareParms(UT_IStream &,
                                          UT_String &errors) override
                         {
                             errors += "Spare parameters are not alowed on ";
                             errors += "the root node.";
                             return false;
                         }

    /// Runs the user-defined post load script when loading
    /// a new network into Houdini.
    void                 runPostLoadScript();

private:
    // Disallow copying of OP_Director, these methods are not implemented
    // on purpose
    OP_Director(const OP_Director &copy);
    OP_Director &operator =(const OP_Director &copy);

    void                 installCommands();
    void                 installMoreCommands();
    void                 installCHCommands();
    void                 installOTLCommands();
    void                 installOpRampResolver();

    void                 savePreCommands(std::ostream &os);
    void                 savePostCommands(std::ostream &os);

    void                 notifyEventCallbacks(EventType type);

    /// Helper function to update to a new operator definition.  May delete
    /// the old operator and return a different one.
    void                 updateNewDefinition(
                            OP_Operator *&op,
                            OP_OTLLibrary *newlib,
                            int newdefindex);

    void varChanged(const UT_String &varname);
    void varsChanged(const UT_StringArray &varnames);

    /// Helper function for runDefaultStartupScripts().
    /// Pass back the full path of the first startup script file
    /// found in the Houdini path.
    static void          getFirstFoundStartupScriptFile(
                            UT_StringHolder &script_path,
                            const char *script_file_name);

    /// Helper function for runDefaultStartupScripts().
    /// Passes back the full path of the first finding of inputpath
    /// in the script search directories.  The file name of outputpath
    /// may end in any of the acceptable script file extensions
    /// (i.e. .py or .cmd).
    static void          getFirstFoundScriptFile(
                            UT_StringHolder &outputpath,
                            const char *inputpath);

    static void          sceneSaveEvent(EventType event, UT_Args &args);

private:
    char                                *myBadLoadData;
    int                                  myBadLoadDataLen;
    OP_CommandManager                    myCommandManager;
    fpreal32                             myVersion;
    int                                  myInLoadCount;

    struct CwdContext
    {
        CwdContext() : myCwdId(-1)
        {
        }
        int                              myCwdId;
        UT_IntArray                      myCwdStack;
        UT_IntArray                      myEvalCollectionStack;
    };
    UT_ThreadSpecificValue<CwdContext>   myCwdContext;

    OP_ItemIdList                                        myPickedItems;
    UT_Array<std::pair<OP_ItemId, OP_ConnectorId> >      myPickedInputs;

    OP_SaveCallback                     *myCallbacks;
    OP_SaveCallback                     *myUserDisplayOptionCallback;
    OP_SaveCallback                     *mySceneFileVisualizersCallback;
    OP_BundleList                       *myBundles;
    OP_Take                             *myTakeManager;
    OP_StyleManager                     *myStyleManager;
    OP_FileResolver                     *myFileResolver;
    UT_ColorTable                        myGroupColorTable;

    int                                  myCookEnabled;
    int                                  mySimulationEnabled;
    int                                  mySkipPlaybarBasedSimulationReset;
    UT_ValArray<op_ShopClerkInfo *>      myShopInfo;

    OP_OTLManager                        myOTLManager;
    OP_OperatorTableList                 myTablesToReload;
    UT_StringSet                        *myDummyDefinitionActivations;

    OP_GlobalOpChangedCallbacks          myGlobalOpChangedCallbacks;
    UT_ValArray<void *>                  myGlobalOpChangedCallbackData;

    struct EventCallbackInfo
    {
        EventCallback            cb;
        void                    *data;
        friend bool operator==(const EventCallbackInfo &lhs, const EventCallbackInfo &rhs)
        {
            return (lhs.cb == rhs.cb) && (lhs.data == rhs.data);
        }
    };
    
    // EventCallbackInfoList will emulate an ordered set
    //
    // This is important since we want to ensure that:
    // 1 - callbacks are executed in the order that they're registered
    // 2 - only a single unique callback+data pair can be registered
    //
    // These are "enforced" in 1-notifyEventCallbacks and 2-addEventCallback
    //
    typedef UT_Array<EventCallbackInfo> EventCallbackInfoList;
    EventCallbackInfoList                myEventCallbacks[NUM_NETWORK_EVENT_TYPES];

    // Cache of global (i.e. non-operator specific) event script paths.
    OP_EventScriptPathCache             *myGlobalEventScriptPathCache;

    OrientationMode                      myOrientationMode;

    // This flag tracks whether any OPs that got loaded had the old
    // style override flag.  If so, we know we will have to do a complete
    // update.
    bool                                 myOldCHOPOverrideFlag;
    // This flag tracs whether or not we are inside a call to loadNetwork.
    // This is different from the isLoading flag, which gets set during any
    // network load.
    bool                                 myIsLoadingHip;
    bool                                 mySwitchingTake;
    // This value is temporarily set to true when the user explicitly asks
    // for a hip file save either by executing an mwrite, or choosing Save
    // or Save As from the File menu.
    bool                                 myIsDoingExplicitSave;
    // This flag is set to true while Houdini is exiting.
    bool                                 myIsQuitting;
    
    // This flag is set when the OP director is created for mantra.  There are
    // some OP features which are expensive (i.e. importing the hou python
    // module).  This option disables those features.
    bool                                 myIsMantra;

    // Set to true while Houdini is clearing the scene.
    bool                                 myIsClearing;
    bool                                 mySaveSceneAsText;
    bool                                 myNewFileSaveSceneAsText;

    // Flag to track if we are running 456.cmd, in case the user wants to
    // merge in another hip file in this script. We don't want to end up
    // calling 456.cmd recursively.
    bool                                 myRunningPostLoadScript = false;

    static UT_Obfuscator                 *theObfuscator;
};

OP_API extern OP_Director       *OPgetDirector();
OP_API extern OP_Director       *OPsetDirector(OP_Director *boss);

/// Create an evaluation context scope with a new node
class OP_API OP_Director::CwdScope : UT_NonCopyable
{
public:
    CwdScope(int thread, const OP_Node &new_cwd);
    ~CwdScope();
private:
    int                     myThread;
    CH_EvalContext::Scope   myEvalScope;
    int                     myOldCwdId;
};

#endif