PRM_Instance.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_Instance.h (Parameter Library)
 *
 * COMMENTS:
 *              A PRM_Instance contains all the variable data relating to
 *              parameters. In other words it contains the actual values
 *              of the parameter. The types and format of the values are
 *              specified in the PRM_Template portion of a parameter. A
 *              PRM_Instance is to a PRM_Template as an object is to a
 *              class in C++.
 */

#ifndef __PRM_Instance_h__
#define __PRM_Instance_h__

#include "PRM_API.h"
#include "PRM_Callback.h"
#include "PRM_ChanState.h"
#include "PRM_Default.h"
#include "PRM_Error.h"
#include "PRM_KeySetType.h"
#include "PRM_Parm.h"
#include "PRM_ParmList.h"
#include "PRM_Template.h"
#include "PRM_Type.h"

#include <CH/CH_Collection.h>
#include <CH/CH_ExprLanguage.h>
#include <CH/CH_Manager.h>
#include <CH/CH_Types.h>
#include <DEP/DEP_MicroNode.h>

#include <EXPR/EX_Error.h>
#include <UT/UT_Array.h>
#include <UT/UT_Assert.h>
#include <UT/UT_Color.h>
#include <UT/UT_SmallObject.h>
#include <UT/UT_String.h>
#include <UT/UT_StringHolder.h>
#include <UT/UT_TBBSpinLock.h>
#include <UT/UT_UniquePtr.h>
#include <UT/UT_VectorTypes.h>
#include <SYS/SYS_Inline.h>
#include <SYS/SYS_Types.h>

#include <iosfwd>


class PRM_ChoiceList;
class PRM_Multi;
class PRM_ConstMicroNode;
class PRM_ParmMicroNode;
class PRM_ParmOwner;
class PRM_Range;
class PRM_RefId;
class PRM_Value;
class CH_Channel;
class CH_FullKey;
class UT_IStream;
class UT_JSONValueMap;
class UT_Packet;
class UT_TokenString;
class UT_WorkBuffer;


class PRM_API PRM_Instance : public UT_SmallObject<PRM_Instance,
                                           UT_SMALLOBJECT_CLEANPAGES_DEFAULT,
                                           UT_SMALLOBJECT_PAGESIZE_DEFAULT,
                                           UT_SMALLOBJECT_THREADSAFE_OFF>
{
public:
                          PRM_Instance(PRM_Template *thetemplateptr,
                                       PRM_Parm *parm);
                          PRM_Instance(PRM_Instance *thesrcptr,
                                       PRM_Parm *parm);
    virtual              ~PRM_Instance();

    virtual void          adopt(PRM_Instance &thesrcinstance);
    virtual void          adoptOverrides(PRM_Instance &thesrcinstance);

    virtual PRM_Instance *duplicateSelf(PRM_Parm *node) = 0;

    virtual void          setValueToDefault(fpreal time, int index,
                                            PRM_AddKeyType add_key) = 0;
    virtual void          revertToDefault(int index) = 0;
    virtual void          revertToDefaults(bool clear_channels =true) = 0;
    virtual void          restoreFactoryDefault(int index) = 0;
    virtual void          overwriteDefault(fpreal time, int index) = 0;
    virtual void          overwriteDefaults(fpreal time) = 0;
    virtual int           isDefault(int index, enum PRM_DefaultType deftype,
                                    bool basiccheck = true) const;
    bool                  isAllDefault(enum PRM_DefaultType deftype) const;
                    
    virtual void          save(std::ostream &os, int binary, bool compiled) const=0;
    virtual bool          load(UT_IStream &is) = 0;

    virtual void          saveUndoData(PRM_UndoDataHandle &data) const;
    virtual bool          loadUndoData(const PRM_UndoDataHandle &data);

    virtual void          saveCommand(std::ostream &os, int values=0, int index = -1)
                                      const = 0;
    virtual int           loadCommand(int argc, const char *const argv[],
                                        int index,
                                        bool values_only, 
                                        PRM_AddKeyType add_key,
                                        PRM_KeySetType set_type) = 0;

    virtual void          getValue(PRM_ParmList *parm_list, fpreal time,
                                   int32 &value, int index,
                                   int thread) const = 0;
    virtual void          getValue(PRM_ParmList *parm_list, fpreal time,
                                   int64 &value, int index,
                                   int thread) const = 0;
    virtual void          getValue(PRM_ParmList *parm_list, fpreal time,
                                   fpreal &value, int index,
                                   int thread) const = 0;
    virtual void          getValue(PRM_ParmList *parm_list, fpreal time,
                                   UT_String &value, int index,
                                   bool expand, int thread) const = 0;
    virtual void          getValue(PRM_ParmList *parm_list, fpreal time,
                                   PRM_DataItemHandle &value, int index,
                                   int thread) const = 0;
    virtual void          getValue(PRM_ParmList *parm_list, fpreal time,
                                   UT_JSONValueMap &value, int index,
                                   bool expand, int thread) const = 0;
    virtual void          getValues(PRM_ParmList *parm_list, fpreal time,
                                   fpreal32 *value, int thread) const;
    virtual void          getValues(PRM_ParmList *parm_list, fpreal time,
                                   fpreal64 *value, int thread) const;
    virtual void          getValues(PRM_ParmList *parm_list, fpreal time,
                                   int32 *theints, int thread) const;
    virtual void          getValues(PRM_ParmList *parm_list, fpreal time,
                                   int64 *theints, int thread) const;
    virtual void          getDefaultValue(fpreal &value, int index) const;
    virtual void          getDefaultValue(int32 &value, int index) const;
    virtual void          getDefaultValue(int64 &value, int index) const;
    virtual void          getDefaultValue(UT_String &value, int index) const;

    virtual void          getExpressionStringForUI(fpreal time,
                                                   UT_String &value,
                                                   int index,
                                                   int thread) const = 0;
    virtual void          getExpression(fpreal time, UT_String &value,
                                        int index, bool allow_value,
                                        int thread) const = 0;
    virtual void          setExpression(fpreal time,
                                        const char *value,
                                        CH_ExprLanguage language,
                                        int index, bool evaluate = true,
                                        bool rmchannel = false);

    CH_StringMeaning      getStringMeaning(fpreal time, int index) const;

    // If this parm contains an expression this function returns that
    // expression's language.  Otherwise, it returns the language that it
    // would be if it was turned into an expression.
    CH_ExprLanguage       getExprLanguageIfMadeAnExpression(fpreal time,
                                                            int index) const;

    // If there is an expression, this function returns whether the
    // expression's language for the segment at the given time is Old Expr.
    // If there is no expression, this function returns true.
    bool                  isLanguageOldExprOrLiteral(fpreal time, int index) const;

    // set value of a parameter
    //   setkey - determines how the value is set at keyframes.
    //        Whether the preference is used or always set as pending
    virtual void          setValue(fpreal time,
                                   const char *value,
                                   CH_StringMeaning meaning,
                                   bool kill_expr = false,
                                   int index = 0,
                                   PRM_AddKeyType add_key = PRM_AK_MARK_PENDING,
                                   PRM_KeySetType setkey = PRM_USE_PREFERENCES);

    virtual void          setValue(fpreal time,
                                   fpreal value,
                                   bool kill_expr = false,
                                   const int index = 0,
                                   PRM_AddKeyType add_key = PRM_AK_MARK_PENDING,
                                   PRM_KeySetType setkey = PRM_USE_PREFERENCES);

    virtual void          setValue(fpreal time,
                                   int32 value,
                                   bool kill_expr = false,
                                   const int index = 0,
                                   PRM_AddKeyType add_key = PRM_AK_MARK_PENDING,
                                   PRM_KeySetType setkey = PRM_USE_PREFERENCES);

    virtual void          setValue(fpreal time,
                                   int64 value,
                                   bool kill_expr = false,
                                   const int index = 0,
                                   PRM_AddKeyType add_key = PRM_AK_MARK_PENDING,
                                   PRM_KeySetType setkey = PRM_USE_PREFERENCES);

    virtual void          setValue(fpreal time,
                                   const PRM_DataItemHandle &value,
                                   bool kill_expr = false,
                                   const int index = 0,
                                   PRM_AddKeyType add_key = PRM_AK_MARK_PENDING,
                                   PRM_KeySetType setkey = PRM_USE_PREFERENCES);

    //
    // The setValues methods set all entries in the vector...
    //
    virtual void          setValues(fpreal time,
                                    const fpreal *values,
                                    bool kill_expr = false,
                                    PRM_AddKeyType add_key = PRM_AK_MARK_PENDING,
                                   PRM_KeySetType setkey = PRM_USE_PREFERENCES);

    virtual void          setValues(fpreal time,
                                    const int64 *values,
                                    bool kill_expr = false,
                                    PRM_AddKeyType add_key = PRM_AK_MARK_PENDING,
                                    PRM_KeySetType setkey = PRM_USE_PREFERENCES);

    virtual void          setDefaultChannelValue(CH_Channel *channelptr,
                                                 int index = 0) = 0;

    virtual bool          isMultiParm() const;
    virtual int           getMultiParmNumItems() const;
    virtual int           getMultiParmInstancesPerItem() const;
    virtual const char   *getMultiParmToken(int p, int index) const;
    // Only PRM_ParmList should directly call these insert/remove methods.
    // All other users, should use the insert/remove methods in OP_Parameter.
    virtual void          insertMultiParmItem(int index);
    virtual void          removeMultiParmItem(int index);

    virtual void          buildOpDependencies(const PRM_RefId &ref, int thread);
    virtual void          changeOpRef(const char *new_fullpath,
                                      const char *old_fullpath,
                                      const char *old_cwd,
                                      const char *chan_name,
                                      const char *old_chan_name,
                                      void (*undo_callback)(void *),
                                      void *undo_data,
                                      int thread);

    fpreal                findNextKey(fpreal theoldtime, int index=-1);
    fpreal                findPrevKey(fpreal theoldtime, int index=-1);

    virtual int           findString(const char *str, bool fullword,
                                     bool usewildcards) const;
    virtual int           changeString(const char *from, const char *to,
                                       bool fullword);

    virtual bool          notifyVarChange(int subindex, const char *varname);

    virtual bool          getMagicString(UT_TokenString &magic,
                                         PRM_ParmList *list, int size,
                                         fpreal t, bool add_if_default /*=true*/,
                                         int thread) = 0;

    unsigned              getEnableState(int comp = -1) const; 
    bool                  setEnableState(bool f, int comp = -1);

    int                   getExpressionState() const
                          {
                              return myBitField & BITFLAG_EXPRESSIONSTATE;
                          }
    void                  setExpressionState(int state)
                          {
                              if (state)
                                  myBitField |= BITFLAG_EXPRESSIONSTATE;
                              else
                                  myBitField &= ~BITFLAG_EXPRESSIONSTATE;
                          }
    int                   getValueState() const
                          {
                              return myBitField & BITFLAG_VALUESTATE;
                          }
    void                  setValueState(int state)
                          {
                              if (state)
                                  myBitField |= BITFLAG_VALUESTATE;
                              else
                                  myBitField &= ~BITFLAG_VALUESTATE;
                          }

    virtual bool          isEditable(PRM_ParmList *thelist, fpreal time,
                                     int index) const { return true; }
    virtual bool          isEditableByUI(PRM_ParmList *thelist, fpreal time,
                                         int index) const { return true; }

    CH_Collection        *getChannelGroupPtr() const
                            {
                                return getParmList()
                                    ? getParmList()->getChannelGroupPtr()
                                    : nullptr;
                            }
    fpreal               getEvalTime(int thread) const
                            {
                                CH_Collection *coll = getChannelGroupPtr();
                                if (!coll)
                                    return 0.0;
                                return coll->getManager()
                                                    ->getEvaluateTime(thread);
                            }
    fpreal               getGlobalStartTime() const
                            {
                                CH_Collection *coll = getChannelGroupPtr();
                                if (!coll)
                                    return 0.0;
                                return coll->getManager()->getGlobalStart();
                            }

    CH_Channel           *getChannel(int subindex) const
                            {
                                UT_ASSERT(subindex >= 0
                                            && subindex < getVectorSize());
                                return myChannelPtrs[subindex];
                            }
    void                  setChannel(int subindex, CH_Channel *chp)
                            {
                                myChannelPtrs[subindex] = chp;
                            }

    void                  reloadChannelPtrs();
    int                   channelPtrModified(const UT_StringRef &name);
    void                  internalAddChannel(int index,
                                             const char *theexpr,
                                             CH_ExprLanguage language,
                                             bool add_seg = true);
    void                  addChannel(int index);
    int                   addChannel(const UT_StringRef &name);
    void                  addChannel(int index, const char *theexpr,
                                     CH_ExprLanguage language);
    int                   addChannel(const UT_StringRef &name, const char *expr,
                                     CH_ExprLanguage language);
    bool                  removeChannel(int index);
    int                   getChannelCount() const;

    // Determine if a given component if time/data dependent. Use -1 if you
    // want to know this for any of the components in the parm.
    virtual bool          isTimeDependent(int subindex) const;
    virtual bool          isDataDependent(fpreal gtime, int subindex) const;

    virtual void          setTimeDependent(int subindex, bool timedep);
    // Form for setTimeDependent() for the evaluation code path
    void                  setTimeDependentForEval(int vi, bool timedep) const
                          { SYSconst_cast(this)->setTimeDependent(vi, timedep);}

    bool                  hasContextOptionDeps(int subindex) const;
    const DEP_ContextOptionDeps &getContextOptionDeps(int subindex) const;
    bool                  hasGlobalContextOptionDependency(int subindex,
                                const UT_StringRef &opt) const;
    void                  addContextOptionDep(int subindex,
                                const UT_StringHolder &opt,
                                bool set_dependency_on_global);

    int                   changePending(int index);
    virtual PRM_ChanState getChanState(fpreal time, int index) const;
    virtual PRM_ChanState getChanState(fpreal time) const;

    // add keyframes if changes are pending
    virtual void          hardenChanges(fpreal time,
                                        int index,
                                        bool theforceflag,
                                        const char *patt = nullptr,
                                        CH_ChannelRefList *list = nullptr) = 0;

    // sets a key even if no channel exists
    void                  setKey(fpreal time, int index);
    void                  setKey(fpreal time, int index, const char *expr,
                                 CH_ExprLanguage language,
                                 const char *patt = nullptr,
                                 CH_ChannelRefList *list = nullptr);

    void                  setFullKey(fpreal gtime, int index,
                                CH_FullKey const& key, 
                                bool accel_ratios = true);

    unsigned int          getSaveFlags() const
                          { return myBitField & BITFLAG_SAVE_MASK; }
    void                  setSaveFlags(unsigned int f)
                          { myBitField |= (f & BITFLAG_SAVE_MASK); }

    bool                  getActiveTakeFlag() const
                          { return myBitField & BITFLAG_ACTIVETAKE; }
    bool                  getAlwaysTakeFlag() const
                          { return myBitField & BITFLAG_TAKEALWAYSACTIVE; }
    void                  setActiveTakeFlag(int onoff)
                          {
                              if (onoff) myBitField |= BITFLAG_ACTIVETAKE;
                              else
                              {
                                  if (!(myBitField & BITFLAG_TAKEALWAYSACTIVE))
                                       myBitField &= ~BITFLAG_ACTIVETAKE;
                                  else myBitField |= BITFLAG_ACTIVETAKE;
                              }
                          }

    bool                  getBypassFlag() const
                          { return myBitField & BITFLAG_BYPASS; }
    void                  setBypassFlag(bool onoff)
                          {
                              // Only allow bypass on spare parameters
                              if (isSpareParm() && onoff)
                                  myBitField |=  BITFLAG_BYPASS;
                              else
                                  myBitField &= ~BITFLAG_BYPASS;
                          }

    bool                  getVisibleState(int comp = -1) const;
    void                  setVisibleState(bool f, int comp = -1);

    bool                  getUndoSavedFlag()
                          { return myBitField & BITFLAG_UNDOSAVED; }
    void                  setUndoSavedFlag(bool f)
                          { if (f) myBitField |= BITFLAG_UNDOSAVED;
                            else myBitField &= ~BITFLAG_UNDOSAVED;}
    bool                  getAutoTakeUndoSavedFlag()
                          { return myBitField & BITFLAG_AUTOTAKEUNDOSAVED; }
    void                  setAutoTakeUndoSavedFlag(bool f)
                          { if (f) myBitField |= BITFLAG_AUTOTAKEUNDOSAVED;
                            else myBitField &= ~BITFLAG_AUTOTAKEUNDOSAVED;}

    bool                  getSaveAutoScopeFlag() const
                          { return myBitField & BITFLAG_SAVEAUTOSCOPE; }

    bool                  getSaveAutoSelectFlag() const
                          { return myBitField & BITFLAG_SAVEAUTOSELECT; }

    void                  setSaveLabelFlag(bool f);
    bool                  getSaveLabelFlag() const
                          { return myBitField & BITFLAG_SAVELABEL; }

    bool                  getLockedFlag(int vec_idx) const;
    bool                  areAllComponentsLocked() const;
    void                  setLockedFlag(int vec_idx, bool f);
    bool                  getAutoScopedFlag(int vec_idx) const;
    void                  setAutoScopedFlag(int vec_idx, bool f);

    bool                  getDefaultsInitFlag() const
                          { return (myBitField & BITFLAG_DEFAULTSINIT) != 0; }
    void                  setDefaultsInitFlag(bool f)
                          { if (f) myBitField |= BITFLAG_DEFAULTSINIT;
                            else myBitField &= ~BITFLAG_DEFAULTSINIT;}

    unsigned int          getLockField() const
                                { return myLockField; }
    unsigned int          getAutoScopeField() const
                                { return myAutoScopeField; }

    virtual int           setOverride(int index, int data_idx,
                                      const char *source,
                                      PRM_OverrideType type);
    virtual int           setOverrideDisable(int index, int onoff);
    virtual const char   *getOverride(int index) const;
    virtual bool          getOverrideType(int index,
                                          PRM_OverrideType& type) const;
    virtual int           getOverrideDataIndex(int index) const;

    ///Sometimes we may want to make an existing and enabled override 
    ///temporarily inactive, so that we can "shut off" the override without 
    ///losing any dependencies between the parm and the source of its exported 
    ///override values. (e.g. might want to temporarily change the parm's 
    ///display colour)
    virtual int           getIsOverrideActive(int index) const; 

    virtual void          destroyChildParms() { }

    // A parameter becomes dirty whenever its value is set.
    bool                  isDirty(int vec_idx) const
                          { return getFieldBit(myDirtyParmFlags, vec_idx); }
    bool                  areAllFlagsClean() const
                          { return !myDirtyParmFlags; }
    void                  clearAllDirtyFlags()
                          { myDirtyParmFlags = 0; }
    void                  setDirtyFlags(int vec_idx)
                          {
                              setFieldBit(myDirtyParmFlags, vec_idx, true);
                              setSendExtra(vec_idx);
                          }

    // mySendExtraFlags is a per-component bitfield that has its bit set
    // if it needs to be dirty propagated.
    bool                  isSendExtra(int vi) const
                          { return getFieldBit(mySendExtraFlags, vi); }
    bool                  hasAnySendExtraFlags() const
                          { return (mySendExtraFlags != 0); }
    void                  setSendExtra(int vi)
                          {
                              if (!getFieldBit(mySendExtraFlags, vi))
                              {
                                  setFieldBit(mySendExtraFlags, vi, true);
                                  getParmList()->bumpNumSendExtra(
                                        vi < 0 ? getVectorSize() : +1);
                              }
                          }

    // The input notify value is not created by default.  Call
    // createInputNotifyValue when you need it.  Handles use this
    // notify value to add an interest in input fields so they can know
    // when the input has changed.  Op's trigger this notify value when
    // they generate their input groups, if this value exists.
    void                  createInputNotifyValue();
          PRM_Value      *inputNotifyValue()       { return myNotifyValue; }
    const PRM_Value      *inputNotifyValue() const { return myNotifyValue; }

    const PRM_Type      &getType() const
                         { return myTemplatePtr->getType(); }
    PRM_TypeExtended     getTypeExtended() const
                         { return myTemplatePtr->getTypeExtended(); }
    PRM_MultiType        getMultiType() const
                         { return myTemplatePtr->getMultiType(); }
    fpreal               getMultiSize() const
                         { return myTemplatePtr->getMultiSize(); }
    int                  getMultiStartOffset() const
                         { return myTemplatePtr->getMultiStartOffset(); }
    const PRM_Template  *getMultiParmTemplate() const
                         { return myTemplatePtr->getMultiParmTemplate(); }
    PRM_Template        *getMultiParmTemplate()
                         { return myTemplatePtr->getMultiParmTemplate(); }
    const char          *getToken() const
                         { return myTemplatePtr->getToken(); }
    const char          *getLabel() const
                         { return myTemplatePtr->getLabel(); }
    PRM_Callback         getCallback() const
                         { return myTemplatePtr->getCallback(); }
    int                  getVectorSize() const
                         { return myTemplatePtr->getVectorSize(); }
    const PRM_Range *    getRangePtr() const
                         { return myTemplatePtr->getRangePtr(); }
    void                 getChannelToken(UT_String &chname, int i) const
                         { myTemplatePtr->getChannelToken(chname, i); }
    const UT_StringHolder& getChannelToken(int i) const
                         { return myTemplatePtr->getChannelToken(i); }
    const PRM_ChoiceList *getChoiceListPtr() const
                         { return myTemplatePtr->getChoiceListPtr(); }

    const PRM_Template  *getTemplatePtr() const { return myTemplatePtr; }
    PRM_Template        *getTemplatePtr() { return myTemplatePtr; }

    // get/setChannelAlias allow the manipulation of channel aliases.  
    // setChannelAlias will return false if the operation fails and true
    // otherwise.  Do not use the set method directly, only PRM_ParmList should
    // do that.  To set a channel alias, use the OP_Node method.
    bool                 hasChannelAlias(int index) const;
    void                 getChannelAlias(UT_String &strref, int index) const;
    const UT_StringHolder& getChannelAlias(int index) const;
    bool                 setChannelAlias(const UT_StringHolder &token_alias,
                                         int index);

    // Returns the sub-index of the parm given by the name thechannelname.  If
    // allow_alias is true, the channel name aliases are also searched, 
    // otherwise they are ignored.
    int                  findSubIndex(const UT_StringRef &thechannelname,
                                      bool allow_alias) const;

    PRM_ParmOwner       *getParmOwner() const
                            { return myParm->getParmOwner(); }
    PRM_ParmList        *getParmList() const
                            { return myParm->getOwner(); }
    PRM_Parm            *getParm() const
                            { return myParm; }

    static bool          isChanRefString(const char *str, bool is_expr,
                                         UT_String *chref = nullptr);
    static bool          isObsoleteDirectChanRefString(
                                const char *str,
                                UT_String *chref = nullptr);

    // Returns true if the channame is the token (or alias) of the channel at 
    // vec_index, and returns false otherwise.
    // The length of channame can be given in channamelen to speed up rejections
    // if the caller caches the string length.
    bool                 hasChannelName(const UT_StringRef &s, int vi) const;

    // Methods for accessing and setting the active handle binding flag
    bool                 isActive(const int index) const;
    void                 setActive(const int index, const bool active);

    // Spare parameter flag
    bool                 isSpareParm() const;
    void                 setSpareParm(bool spare);

    // Multiparm instance information
    const PRM_Instance  *getMultiParmOwner() const;
    void                 setMultiParmOwner(const PRM_Multi *multiparmowner);

    /// Returns the multi-parm template for this child parm. Returns nullptr
    /// if this parm is not part of a multi-parm
    const PRM_Template  *findMultiParmTemplate() const;

    /// Return the list of instance indicies for this parameter.
    /// If this parameter is part of a multi-parameter, then its index in the
    /// multi-parm array will be inserted into the indices array.  If the
    /// multi-parm is nested in other multi-parms, then the indices array will
    /// have multiple entries (with the outer multi-parm listed first, and the
    /// inner-most multi-parm last in the array).
    /// \param indices The list of index instances.
    /// \param instance_index Each multi-parm can have multiple parameters in
    /// each instance.  If instance_index is true, the instance number will be
    /// returned.  Otherwise the raw offset into the multi-parm will be
    /// extracted.
    int                  getMultiInstanceIndex(UT_Array<int> &indices,
                                bool instance_index=true) const;

    bool                 validIndex(int index) const;

    virtual int64        getMemoryUsage(bool inclusive) const;

    virtual bool         isRotationParm() const
                         { return false; }

    /// During loading we need to validate that the channels tied to the
    /// parameter indices are correclty mapped.
    void                validateChannelNames(PRM_ParmList &list);

    /// Thread-safe access to get or create a micronode
    DEP_MicroNode &      microNode(int vi);

    
    /// Thread-safe access to get micronodes
    void                 getMicroNodes(DEP_MicroNodeList &micronodes) const;

    /// Return true if this parameter has micronodes, NOT thread-safe
    bool                 hasMicroNodes() const
                            { return (myMicroNodes != nullptr); }
    
    void                 clearMicroNodeInputs();
    void                 getMicroNodeInputList(DEP_MicroNodeList &inputs) const;
    int                  getMicroNodeNumInputs() const;
    void                 getMicroNodeOutputList(DEP_MicroNodeList &outputs) const;

    void                 propagateDirty(
                            const DEP_MicroNode::Visitor& client_visit,
                            DEP_MicroNode *parmlist_micronode,
                            bool force,
                            bool *dirtied_data = nullptr);
    void                 dumpMicroNodes(
                            std::ostream &os,
                            bool as_DOT,
                            int indent_level) const;
    int64                getMicroNodesMemoryUsage() const;

    /// Custom Channel Color
    bool                 hasChannelCustomColor(int index) const;
    const UT_Color      &getChannelCustomColor(int index) const;
    void                 setChannelCustomColor(int index, const UT_Color &c);
    void                 resetChannelCustomColor(int index);

    bool         getAutoSelectFlag(int vec_idx) const;
    void         setAutoSelectFlag(int vec_idx, bool f);
    unsigned int getAutoSelectField() const
                                { return myAutoSelectField; }

    void          setTimeDependentMicroNode(int subindex, bool timedep);

    /// Thread-safe access to get or create a const micronode
    /// A const micro node gives the same dependencies as
    /// microNode(), but the time dependent flag will always be
    /// false.
    /// It also creates missing base microNodes.
    DEP_MicroNode &      constMicroNode(int vi);
protected:
    void                 clearAndDestroyChannels();

    void                 addParmWarning(PRM_ErrorCode code) const;
    void                 indexError(int index);

    void                 setLockField(unsigned int locks)
                         { myLockField = locks; }
    void                 setAutoScopeField(unsigned int field)
                         {
                             myAutoScopeField = field;
                             myBitField |= BITFLAG_SAVEAUTOSCOPE;
                         }

    void                 setAutoSelectField(unsigned int field)
                         {
                             myAutoSelectField = field;
                             myBitField |= BITFLAG_SAVEAUTOSELECT;
                         }

    SYS_FORCE_INLINE void
    checkForExpressionErrors(
            const PRM_ParmList *thelist, int vector_index, int thread) const
    {
        int err;
        err = ev_GetErrNo(thread);
        if (err != EV_NOERROR)
            evaluationError(thelist, vector_index, err, thread);
    }

    bool                 validateAccess();

    // This helper method is called by loadCommand() in derived classes to
    // load the token either as a reference to our channel, or failing that,
    // as an expression.
    void                 loadTokenAsChannelNameOrExpression(
                                const UT_String &token, int index);

    // This method loads the options of the parm that are within '[]' before
    // the parm value.  The istream must be positioned after the first '['
    // and this method will leave it after the ']' and return true.  If it
    // could not correctly parse the options, it will return false.
    bool                 loadAsciiOptions(UT_IStream &is, uint &pending_mask);

    // This method checks the given binary packet id against the list of 
    // options it supports, if successful, it loads the packet and returns
    // true, otherwise returns false.
    bool                 loadBinaryOption(UT_IStream &is, short packet_id);

    // This method will save the options of the parm if there are any to set.
    // Currently, only the locked flag is saved.  If the parm is not locked,
    // this method won't do anything in an effort to maintain forwards 
    // compatibility with older versions of Houdini.
    // Returns true if anything was written to the stream.
    void                 saveAsciiOptions(std::ostream &os) const;
    bool                 saveBinaryOptions(int class_packet_id,
                                           UT_Packet &packet,
                                           std::ostream &os) const;

    CH_ExprLanguage      stringMeaningToExprLanguage(
                                        CH_StringMeaning meaning) const;

    enum PRM_ParmIOToken
    {
        PRM_IO_TOKEN_DELIMITER,
        PRM_IO_TOKEN_BRACKET_SPACE,
        PRM_IO_TOKEN_OPTS_OPEN,
        PRM_IO_TOKEN_OPTS_CLOSE,
        PRM_IO_TOKEN_OPTS_LOCKS,
        PRM_IO_TOKEN_OPTS_AUTOSCOPE,
        PRM_IO_TOKEN_OPTS_BYPASS,
        PRM_IO_TOKEN_OPTS_LABEL,
        PRM_IO_TOKEN_OPTS_COLOR,
        PRM_IO_TOKEN_OPTS_AUTOSELECT,
        PRM_IO_TOKEN_NUM
    };

    // Returns the token used in parm IO.
    static const char   *getPacketIOToken(PRM_ParmIOToken token);
    static int           getPacketIOTokenLen(PRM_ParmIOToken token);
    static int           getPacketIOBinaryId(PRM_ParmIOToken token);

    // Compares if the given text matches a given token.  You
    // must provide the length of the text, which has the virtue
    // of avoiding having to harden buffers!
    static bool          comparePacketIOToken(PRM_ParmIOToken token,
                                    const char *text,
                                    int textlen);

    // returns true if myData should be saved. Used for caching just within a
    // session or preventing expensive copy/pastes.
    bool                  shouldSaveData() const;

private:

    inline bool         getFieldBit(unsigned int field, int i) const
                        {
                            if (i < 0)
                                return (field != 0);
                            else
                                return ((field & (1 << (unsigned)i)) != 0);
                        }
    inline void         setFieldBit(unsigned int &field, int i, bool f)
                        {
                            if (i < 0)
                            {
                                if (f) // enable lowermost vector size bits
                                    field = (1<<(unsigned)getVectorSize()) - 1;
                                else
                                    field = 0;
                            }
                            else
                            {
                                if (f)
                                    field |=  (1 << (unsigned)i);
                                else
                                    field &= ~(1 << (unsigned)i);
                            }
                        }

    void                 getFullParmPath(UT_WorkBuffer &path) const;
    
    /// When loading a file, it's possible that the channel mapping doesn't
    /// match the expected channel name.  In this case, we want to either
    /// rename the channel, or delete the channel (if there are name
    /// collisions).
    void                 validateChannelName(PRM_ParmList &list, int subindex);

    void                 evaluationError(
                            const PRM_ParmList *thelist,
                            int vector_index, int err, int thread) const;

    // This method is *NOT* thread-safe wrt microNode() so do not access the
    // source and destination PRM_Instance pointers from multiple threads when
    // calling this.
    void                 adoptMicroNodes(PRM_Instance &thesrcinstance);

    /// Thread-safe version of hasMicroNodes() that can be called at the same
    /// time as microNode().
    inline PRM_ParmMicroNode *threadSafeMicroNodes() const;

private:

    enum    // bitflags for myBitField
    {
            /*BITFLAG_UNUSED_BIT                = 0x0002,*/
            /*BITFLAG_UNUSED_BIT                = 0x0004,*/
            BITFLAG_EXPRESSIONSTATE             = 0x0008,
            BITFLAG_UNDOSAVED                   = 0x0010,
            BITFLAG_ACTIVETAKE                  = 0x0020,
            BITFLAG_TAKEALWAYSACTIVE            = 0x0040,
            BITFLAG_SAVEAUTOSCOPE               = 0x0080,
            BITFLAG_SPAREPARM                   = 0x0100,
            BITFLAG_AUTOTAKEUNDOSAVED           = 0x0400,
            BITFLAG_DEFAULTSINIT                = 0x0800,
            BITFLAG_VALUESTATE                  = 0x1000,
            BITFLAG_BYPASS                      = 0x2000,
            BITFLAG_SAVELABEL                   = 0x4000,
            BITFLAG_SAVEAUTOSELECT              = 0x8000,

            // Flags that should be saved
            BITFLAG_SAVE_MASK                   = (BITFLAG_EXPRESSIONSTATE)
    };

    unsigned int          myBitField;
    unsigned int          myEnableField;
    unsigned int          myLockField;
    unsigned int          myAutoScopeField;
    unsigned int          myVisibleField;
    unsigned int          myAutoSelectField;

    // Flag to indicate that the handle binded to this parm is active
    unsigned int          myActiveField;

    PRM_Template         *myTemplatePtr;

    PRM_Value            *myNotifyValue;
    unsigned              myDirtyParmFlags;
    unsigned              mySendExtraFlags;

    CH_Channel          **myChannelPtrs;
    UT_UniquePtr<UT_StringHolder[]>
                          myChannelAliases;

    struct ChannelCustomColor
    {
        ChannelCustomColor()
            { myHasCustomColor = false; }
        UT_Color          myColor;
        bool              myHasCustomColor;
    };
    ChannelCustomColor   *myChannelColors;

    PRM_Parm             *myParm;
    const PRM_Multi      *myMultiParmOwner;

    PRM_ParmMicroNode    *myMicroNodes;
    PRM_ConstMicroNode   *myConstMicroNodes;
    mutable UT_TBBSpinLock  myMicroNodesLock;
};

inline int      
PRM_Instance::findSubIndex(const UT_StringRef &thechannelname,
                            bool allow_alias) const
{
    int     size   = myTemplatePtr->getVectorSize();
    int     retval = -1;
    int     i      = 0;

    if (allow_alias && myChannelAliases)
    {
        for (i = 0; i < size; i++)
        {
            if (myChannelAliases[i] == thechannelname)
            {
                retval = i;
                break;
            }
        }
    }

    if (retval == -1)
        retval = myTemplatePtr->findSubIndex(thechannelname);

    return retval;
}

inline unsigned
PRM_Instance::getEnableState(int comp) const
{
    if(comp < 0)
        return myEnableField;

    return ( myEnableField & (1<<comp) ) ? 1 : 0;
}

inline bool
PRM_Instance::getVisibleState(int comp) const
{
    // Separators, labels and headings have no values, so we use the entire
    // visible field for them.
    if (!getVectorSize())
        return (myVisibleField != 0);

    return getFieldBit(myVisibleField, comp);
}

inline void
PRM_Instance::setVisibleState(bool f, int comp)
{
    if (getVectorSize())
        setFieldBit(myVisibleField, comp, f);
    else
        myVisibleField = f ? SYS_UINT32_MAX : 0;
}

#endif