PRM_ParmOwner.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:        PRM_ParmOwner.h (Parameter Library)
 *
 * COMMENTS:
 *              This class is the base class of OP_Parameters. It provides
 *              a method for a PRM_Instance to communicate with its owner
 *              OP_Node through virtual functions.
 */

#ifndef __PRM_ParmOwner__
#define __PRM_ParmOwner__

#include "PRM_API.h"
#include <CH/CH_ExprLanguage.h>
#include <UT/UT_Error.h>
#include <UT/UT_NonCopyable.h>
#include <UT/UT_String.h>
#include <UT/UT_UniquePtr.h>
#include <UT/UT_ValArray.h>
#include <UT/UT_WorkBuffer.h>
#include <SYS/SYS_Compiler.h>
#include <SYS/SYS_Inline.h>
#include <SYS/SYS_Types.h>
#include <iosfwd>

class UT_StringArray;
class PRM_Parm;
class PRM_ParmList;
class PRM_ParmMicroNode;
class PRM_ParmNameMap;

// Forward declare of OP_Node so that we can provide a mechanism to cast to it
// safely.
class OP_Node;

class PRM_API PRM_ParmOwnerContext
{
public:
    PRM_ParmOwnerContext() = default;
    virtual ~PRM_ParmOwnerContext() = default;
    UT_NON_COPYABLE(PRM_ParmOwnerContext)
};

class PRM_API PRM_ParmOwner
{
public:
    virtual OP_Node *            castToOPNode()         { return nullptr; }
    virtual const OP_Node *      castToOPNode() const   { return nullptr; }

    const char          *getFullPath(UT_String &str) const
                        { 
                            UT_WorkBuffer       buf;
                            doGetFullPath(buf);
                            buf.copyIntoString(str);
                            return str.buffer();
                        }
    const char          *getFullPath(UT_WorkBuffer &str) const
                        {
                            doGetFullPath(str);
                            return str.buffer();
                        }
    UT_StringHolder     getFullPath() const
                        {
                            UT_WorkBuffer buf;
                            doGetFullPath(buf);
                            return UT_StringHolder(std::move(buf));
                        }
    SYS_FORCE_INLINE
    PRM_ParmList        *getParmList()
                                 { return myParmList; }
    SYS_FORCE_INLINE
    const PRM_ParmList  *getParmList() const
                                 { return myParmList; }

    virtual bool                 createSpareParametersForLoad(
                                            UT_StringArray &,
                                            PRM_ParmNameMap &,
                                            UT_String &);

    virtual PRM_ParmList        *createObsoleteParmList() = 0;
    virtual void                 resolveAndDeleteObsoleteParmList(
                                            PRM_ParmList *&obsolete_parms) = 0;

    // Runs a command using the OPgetDirector()->getCommandManager()
    // at the OP level. The cwd is set to the current node before
    // executing the command.
    virtual void                 executeCommand(const char *command,
                                                std::ostream *out,
                                                std::ostream *err) const = 0;

    // Set this node as the cwd and return a context object that restores the
    // previous cwd when destroyed.
    SYS_NO_DISCARD_RESULT
    virtual UT_UniquePtr<PRM_ParmOwnerContext>
                         pushAsPwd() const = 0;

    // Pending overrides are strings giving a list of op nodes which
    // will be overridden.  These are used higher up at the OP_Node level.
    bool                 isPendingOverride() const
                         {
                            return myIsPendingOverride;
                         }
    virtual bool         isParmPendingOverride(const char * /*parm_name*/,
                                           int /*vec_idx*/) const
                         {
                             // default implementation that is too coarse
                             return isPendingOverride();
                         }
    const char          *getPendingOverrideString() const
                         {
                            return (const char *) myOverridePending;
                         }
    void                 setPendingOverrideString(const char *s);
    virtual UT_ErrorSeverity
                         prmCookOverrides(fpreal /*t*/, int /*thread*/,
                                          const char * /*parm_name*/,
                                          int /*vec_idx*/)
                            { return UT_ERROR_NONE; }

    // Activates the parm for the take if it should be automatically
    // activated based on its current state and the current take state.
    virtual void         takeAutoActivateParm(PRM_Parm *) = 0;

    // Rebuild the node dependency information for a particular parm on
    // a node. This allows the PRM library to force nodes to update their
    // dependency information.
    virtual void         rebuildParmDependency(int parmidx) = 0;

    // Clear all parm dependency information
    virtual void         clearParmDependency(int parmidx) = 0;

    // Converts opdef and oplib format paths from opdef:nodepath to
    // opdef:tablename/optype.
    virtual void         convertOpdefToAbsolutePath(UT_String &str) const = 0;

    // This function is called when a spare parameter is being removed
    // from our parm list. This is called from PRM_ParmList::updateSpareParms,
    // and provides a way for the OP library to respond to individual parm
    // removals without understanding the internals of the whole operation.
    virtual void         spareParmRemoved(const char *parmname) = 0;

    // This function is caled when any multiparm has a new instance added.
    // It gives the parm owner a chance to initialize the multiparm values.
    virtual void         initMultiparmInstance(UT_ValArray<PRM_Parm *> &p) = 0;

    // This function is called when a multiparm instance is added or removed.
    virtual void         addOrRemoveMultiparmInstance() = 0;

    virtual bool         savePresetContents(std::ostream &os) = 0;
    virtual bool         loadPresetContents(const char *token,
                                            UT_IStream &is) = 0;

    virtual CH_ExprLanguage      getExprLanguage() const = 0;

    // Creates an array of parm micronodes, one per component for the given
    // parm.
    virtual PRM_ParmMicroNode   *createParmMicroNodes(PRM_Parm &parm) const;


    // There are special bespoke functions for the disablewhen and hidewhen
    // conditionals that are parsed through this callback.  They have to
    // move upstream to OP to get access to nInputs(), etc.
    virtual UT_StringHolder     evaluateDisableExpression(const PRM_Parm &prm, const UT_StringRef &function) const;

    // Traverse channel references building dependencies.  Vector index of
    // final parameter is returned in 'sub_idx'.
    virtual const PRM_Parm *traverseRef(int *sub_idx, fpreal time,
                                        int parm_idx, int vec_idx) const = 0;

protected:
             PRM_ParmOwner()
                     : myIsPendingOverride(false)
                     , myParmList(nullptr)
                 { }
    virtual     ~PRM_ParmOwner()
                 { }

    UT_NON_COPYABLE(PRM_ParmOwner)

    virtual int64 getMemoryUsage(bool inclusive) const
    {
        int64 mem = inclusive ? sizeof(*this) : 0;
        mem += myOverridePending.getMemoryUsage(false);
        return mem;
    }

    /// Compute the full path of the node
    virtual void        doGetFullPath(UT_WorkBuffer &buf) const = 0;

    PRM_ParmList                        *myParmList;

private:
    UT_String            myOverridePending;
    bool                 myIsPendingOverride;
};

#endif