CMD_SymbolList.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:        CMD_SymbolList.h ( CMD Library, C++)
 *
 * COMMENTS:    Used by aliases and variables.  The symbol list contains a
 *              symbol and a value
 */

#ifndef __CMD_SymbolList__
#define __CMD_SymbolList__

#include "CMD_API.h"
#include <UT/UT_Lock.h>
#include <UT/UT_NonCopyable.h>
#include <UT/UT_String.h>
#include <UT/UT_StringArray.h>
#include <UT/UT_StringHolder.h>
#include <UT/UT_SymbolTable.h>
#include <SYS/SYS_Compiler.h>
#include <utility>

class CMD_Alias;
class CMD_Manager;

class CMD_API CMD_SymbolEntry : UT_NonCopyable
{
public:
    CMD_SymbolEntry(const char *name, const char *value, bool export_var=false)
        : myName(name)
        , myValue(value)
        , myDirtyFlag(true)
        , myExportFlag(export_var)
    {
        if (myExportFlag)
            exportSymbol();
    }
    ~CMD_SymbolEntry()
    {
        if (myExportFlag)
            unexportSymbol();
    }

    // CMD_SymbolEntry is movable but not copyable
    CMD_SymbolEntry(CMD_SymbolEntry &&movable) noexcept
    {
        operator=(std::move(movable));
    }
    CMD_SymbolEntry &
    operator=(CMD_SymbolEntry &&movable)
    {
        myName = movable.myName;
        myValue = movable.myValue;
        myDirtyFlag = movable.myDirtyFlag;
        myExportFlag = movable.myExportFlag;
        movable.myExportFlag = false;
        return *this;
    }

    const UT_StringHolder   &name() const       { return myName; }
    const UT_StringHolder   &value() const      { return myValue; }
    bool                     isDirty() const    { return myDirtyFlag; }
    bool                     isExport() const   { return myExportFlag; }

    void setValue(const UT_StringHolder &value)
    {
        myValue = value;
        if (myExportFlag)
            exportSymbol();
        myDirtyFlag = true;
    }

    void setDirty(bool f)
    {
        myDirtyFlag = f;
    }

private:
    void exportSymbol();
    void unexportSymbol();

    UT_StringHolder     myName;
    UT_StringHolder     myValue;
    bool                myDirtyFlag;
    bool                myExportFlag;
};

class CMD_API CMD_SymbolList
{
public:
    virtual ~CMD_SymbolList();

    bool                 hasValue(const char *name) const;

    bool                 getValue(const char *name, UT_String &value);
    bool                 getValue(const char *name, UT_StringHolder &value);
    bool                 getValue(const char *name, fpreal32 &value);
    bool                 getValue(const char *name, fpreal64 &value);
    bool                 getValue(const char *name, int64 &value);
    bool                 getValue(const char *name, int32 &value);

    bool                 setValue(const char *name, const char *value,
                                  bool export_var);

    // Sets the value only if it's different. Returns true if set.
    bool                 setValueIfDifferent(
                                  const char *name, const char *value,
                                  bool export_var);

    virtual bool         destroySymbol(const char *name);

    exint                getSymbolNames(UT_StringArray &nameList);

    bool                 setDirty(const char *name, bool dirty);

protected:
    virtual bool         isValidSymbolName(const char *name) const;

    UT_Lock &            getLock() const
                            { return myLock; }

    typedef UT_StringMap<CMD_SymbolEntry> TableMap;

    const TableMap      &table() const  { return myTable; }
    TableMap            &table()        { return myTable; }
    
private:
    const char              *getRawValue(const UT_StringRef &name) const;
    CMD_SymbolEntry         *getSymbolPtr(const UT_StringRef &name);

private:
    TableMap             myTable;
    mutable UT_Lock      myLock;
};

#endif