gecko-dev/xpcom/ds/nsIVariant.idl

/* -*- Mode: IDL; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*-
 *
 * This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

/* The long avoided variant support for xpcom. */

#include "nsISupports.idl"

%{C++
#include "xptinfo.h"

// This enum class used to be a const-only XPIDL interface, containing literal
// integer descriptions of the different fields. Instead, it now directly
// references the nsXPTTypeTag variants VTYPE_ are intended to match.
struct nsIDataType
{
    enum {
        // These MUST match the declarations in xptinfo.h.
        // Otherwise the world is likely to explode.
        VTYPE_INT8              = TD_INT8             ,
        VTYPE_INT16             = TD_INT16            ,
        VTYPE_INT32             = TD_INT32            ,
        VTYPE_INT64             = TD_INT64            ,
        VTYPE_UINT8             = TD_UINT8            ,
        VTYPE_UINT16            = TD_UINT16           ,
        VTYPE_UINT32            = TD_UINT32           ,
        VTYPE_UINT64            = TD_UINT64           ,
        VTYPE_FLOAT             = TD_FLOAT            ,
        VTYPE_DOUBLE            = TD_DOUBLE           ,
        VTYPE_BOOL              = TD_BOOL             ,
        VTYPE_CHAR              = TD_CHAR             ,
        VTYPE_WCHAR             = TD_WCHAR            ,
        VTYPE_VOID              = TD_VOID             ,
        VTYPE_ID                = TD_PNSIID           ,
        VTYPE_CHAR_STR          = TD_PSTRING          ,
        VTYPE_WCHAR_STR         = TD_PWSTRING         ,
        VTYPE_INTERFACE         = TD_INTERFACE_TYPE   ,
        VTYPE_INTERFACE_IS      = TD_INTERFACE_IS_TYPE,
        VTYPE_ARRAY             = TD_LEGACY_ARRAY     ,
        VTYPE_STRING_SIZE_IS    = TD_PSTRING_SIZE_IS  ,
        VTYPE_WSTRING_SIZE_IS   = TD_PWSTRING_SIZE_IS ,
        VTYPE_UTF8STRING        = TD_UTF8STRING       ,
        VTYPE_CSTRING           = TD_CSTRING          ,
        VTYPE_ASTRING           = TD_ASTRING          ,

        // Non-xpt variant types
        VTYPE_EMPTY_ARRAY       = 254                 ,
        VTYPE_EMPTY             = 255
    };
};
%}


/**
 * XPConnect has magic to transparently convert between nsIVariant and JS types.
 * We mark the interface [scriptable] so that JS can use methods
 * that refer to this interface. But we mark all the methods and attributes
 * [noscript] since any nsIVariant object will be automatically converted to a
 * JS type anyway.
 */

[scriptable, uuid(81e4c2de-acac-4ad6-901a-b5fb1b851a0d)]
interface nsIVariant : nsISupports
{
    [noscript] readonly attribute uint16_t     dataType;

    [noscript] uint8_t      getAsInt8();
    [noscript] int16_t      getAsInt16();
    [noscript] int32_t      getAsInt32();
    [noscript] int64_t      getAsInt64();
    [noscript] uint8_t      getAsUint8();
    [noscript] uint16_t     getAsUint16();
    [noscript] uint32_t     getAsUint32();
    [noscript] uint64_t     getAsUint64();
    [noscript] float        getAsFloat();
    [noscript] double       getAsDouble();
    [noscript] boolean      getAsBool();
    [noscript] char         getAsChar();
    [noscript] wchar        getAsWChar();
    [notxpcom] nsresult     getAsID(out nsID retval);
    [noscript] AString      getAsAString();
    [noscript] ACString     getAsACString();
    [noscript] AUTF8String  getAsAUTF8String();
    [noscript] string       getAsString();
    [noscript] wstring      getAsWString();
    [noscript] nsISupports  getAsISupports();
    [noscript] jsval        getAsJSVal();

    [noscript] void getAsInterface(out nsIIDPtr iid, 
                                   [iid_is(iid), retval] out nsQIResult iface);

    [notxpcom] nsresult getAsArray(out uint16_t type, out nsIID iid,
                                   out uint32_t count, out voidPtr ptr);

    [noscript] void getAsStringWithSize(out uint32_t size, 
                                        [size_is(size), retval] out string str);
    
    [noscript] void getAsWStringWithSize(out uint32_t size, 
                                         [size_is(size), retval] out wstring str);
};

/**
 * An object that implements nsIVariant may or may NOT also implement this
 * nsIWritableVariant.
 * 
 * If the 'writable' attribute is false then attempts to call any of the 'set'
 * methods can be expected to fail. Setting the 'writable' attribute may or
 * may not succeed.
 *
 */

[scriptable, uuid(5586a590-8c82-11d5-90f3-0010a4e73d9a)]
interface nsIWritableVariant : nsIVariant
{
    attribute boolean writable;

    void setAsInt8(in uint8_t aValue);
    void setAsInt16(in int16_t aValue);
    void setAsInt32(in int32_t aValue);
    void setAsInt64(in int64_t aValue);
    void setAsUint8(in uint8_t aValue);
    void setAsUint16(in uint16_t aValue);
    void setAsUint32(in uint32_t aValue);
    void setAsUint64(in uint64_t aValue);
    void setAsFloat(in float aValue);
    void setAsDouble(in double aValue);
    void setAsBool(in boolean aValue);
    void setAsChar(in char aValue);
    void setAsWChar(in wchar aValue);
    void setAsID(in nsIDRef aValue);
    void setAsAString(in AString aValue);
    void setAsACString(in ACString aValue);
    void setAsAUTF8String(in AUTF8String aValue);
    void setAsString(in string aValue);
    void setAsWString(in wstring aValue);
    void setAsISupports(in nsISupports aValue);

    void setAsInterface(in nsIIDRef iid, 
                        [iid_is(iid)] in nsQIResult iface);

    [noscript] void setAsArray(in uint16_t type, in nsIIDPtr iid,
                               in uint32_t count, in voidPtr ptr);

    void setAsStringWithSize(in uint32_t size, 
                             [size_is(size)] in string str);
    
    void setAsWStringWithSize(in uint32_t size, 
                              [size_is(size)] in wstring str);

    void setAsVoid();
    void setAsEmpty();
    void setAsEmptyArray();

    void setFromVariant(in nsIVariant aValue);
};

%{C++
// The contractID for the generic implementation built in to xpcom.
#define NS_VARIANT_CONTRACTID "@mozilla.org/variant;1"
%}