jspubtd.h

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/* -*- Mode: C; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*-
 *
 * ***** BEGIN LICENSE BLOCK *****
 * Version: MPL 1.1/GPL 2.0/LGPL 2.1
 *
 * The contents of this file are subject to the Mozilla Public License Version
 * 1.1 (the "License"); you may not use this file except in compliance with
 * the License. You may obtain a copy of the License at
 * http://www.mozilla.org/MPL/
 *
 * Software distributed under the License is distributed on an "AS IS" basis,
 * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
 * for the specific language governing rights and limitations under the
 * License.
 *
 * The Original Code is Mozilla Communicator client code, released
 * March 31, 1998.
 *
 * The Initial Developer of the Original Code is
 * Netscape Communications Corporation.
 * Portions created by the Initial Developer are Copyright (C) 1998
 * the Initial Developer. All Rights Reserved.
 *
 * Contributor(s):
 *
 * Alternatively, the contents of this file may be used under the terms of
 * either of the GNU General Public License Version 2 or later (the "GPL"),
 * or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
 * in which case the provisions of the GPL or the LGPL are applicable instead
 * of those above. If you wish to allow use of your version of this file only
 * under the terms of either the GPL or the LGPL, and not to allow others to
 * use your version of this file under the terms of the MPL, indicate your
 * decision by deleting the provisions above and replace them with the notice
 * and other provisions required by the GPL or the LGPL. If you do not delete
 * the provisions above, a recipient may use your version of this file under
 * the terms of any one of the MPL, the GPL or the LGPL.
 *
 * ***** END LICENSE BLOCK ***** */

#ifndef jspubtd_h___
#define jspubtd_h___
/*
 * JS public API typedefs.
 */
#include "jstypes.h"
#include "jscompat.h"

JS_BEGIN_EXTERN_C

/* Scalar typedefs. */
typedef uint16    jschar;
typedef int32     jsint;
typedef uint32    jsuint;
typedef float64   jsdouble;
typedef jsword    jsval;
typedef jsword    jsid;
typedef int32     jsrefcount;   /* PRInt32 if JS_THREADSAFE, see jslock.h */

/*
 * Run-time version enumeration.  See jsconfig.h for compile-time counterparts
 * to these values that may be selected by the JS_VERSION macro, and tested by
 * #if expressions.
 */
typedef enum JSVersion {
    JSVERSION_1_0     = 100,
    JSVERSION_1_1     = 110,
    JSVERSION_1_2     = 120,
    JSVERSION_1_3     = 130,
    JSVERSION_1_4     = 140,
    JSVERSION_ECMA_3  = 148,
    JSVERSION_1_5     = 150,
    JSVERSION_DEFAULT = 0,
    JSVERSION_UNKNOWN = -1
} JSVersion;

#define JSVERSION_IS_ECMA(version) \
    ((version) == JSVERSION_DEFAULT || (version) >= JSVERSION_1_3)

/* Result of typeof operator enumeration. */
typedef enum JSType {
    JSTYPE_VOID,                /* undefined */
    JSTYPE_OBJECT,              /* object */
    JSTYPE_FUNCTION,            /* function */
    JSTYPE_STRING,              /* string */
    JSTYPE_NUMBER,              /* number */
    JSTYPE_BOOLEAN,             /* boolean */
    JSTYPE_LIMIT
} JSType;

/* JSObjectOps.checkAccess mode enumeration. */
typedef enum JSAccessMode {
    JSACC_PROTO  = 0,           /* XXXbe redundant w.r.t. id */
    JSACC_PARENT = 1,           /* XXXbe redundant w.r.t. id */
    JSACC_IMPORT = 2,           /* import foo.bar */
    JSACC_WATCH  = 3,           /* a watchpoint on object foo for id 'bar' */
    JSACC_READ   = 4,           /* a "get" of foo.bar */
    JSACC_WRITE  = 8,           /* a "set" of foo.bar = baz */
    JSACC_LIMIT
} JSAccessMode;

#define JSACC_TYPEMASK          (JSACC_WRITE - 1)

/*
 * This enum type is used to control the behavior of a JSObject property
 * iterator function that has type JSNewEnumerate.
 */
typedef enum JSIterateOp {
    JSENUMERATE_INIT,       /* Create new iterator state */
    JSENUMERATE_NEXT,       /* Iterate once */
    JSENUMERATE_DESTROY     /* Destroy iterator state */
} JSIterateOp;

/* Struct typedefs. */
typedef struct JSClass           JSClass;
typedef struct JSConstDoubleSpec JSConstDoubleSpec;
typedef struct JSContext         JSContext;
typedef struct JSErrorReport     JSErrorReport;
typedef struct JSFunction        JSFunction;
typedef struct JSFunctionSpec    JSFunctionSpec;
typedef struct JSIdArray         JSIdArray;
typedef struct JSProperty        JSProperty;
typedef struct JSPropertySpec    JSPropertySpec;
typedef struct JSObject          JSObject;
typedef struct JSObjectMap       JSObjectMap;
typedef struct JSObjectOps       JSObjectOps;
typedef struct JSRuntime         JSRuntime;
typedef struct JSRuntime         JSTaskState;	/* XXX deprecated name */
typedef struct JSScript          JSScript;
typedef struct JSString          JSString;
typedef struct JSXDRState	 JSXDRState;
typedef struct JSExceptionState  JSExceptionState;
typedef struct JSLocaleCallbacks JSLocaleCallbacks;

/* JSClass (and JSObjectOps where appropriate) function pointer typedefs. */

/*
 * Add, delete, get or set a property named by id in obj.  Note the jsval id
 * type -- id may be a string (Unicode property identifier) or an int (element
 * index).  The *vp out parameter, on success, is the new property value after
 * an add, get, or set.  After a successful delete, *vp is JSVAL_FALSE iff
 * obj[id] can't be deleted (because it's permanent).
 */
typedef JSBool
(* JS_DLL_CALLBACK JSPropertyOp)(JSContext *cx, JSObject *obj, jsval id,
                                 jsval *vp);

/*
 * This function type is used for callbacks that enumerate the properties of
 * a JSObject.  The behavior depends on the value of enum_op:
 *
 *  JSENUMERATE_INIT
 *    A new, opaque iterator state should be allocated and stored in *statep.
 *    (You can use PRIVATE_TO_JSVAL() to tag the pointer to be stored).
 *
 *    The number of properties that will be enumerated should be returned as
 *    an integer jsval in *idp, if idp is non-null, and provided the number of
 *    enumerable properties is known.  If idp is non-null and the number of
 *    enumerable properties can't be computed in advance, *idp should be set
 *    to JSVAL_ZERO.
 *
 *  JSENUMERATE_NEXT
 *    A previously allocated opaque iterator state is passed in via statep.
 *    Return the next jsid in the iteration using *idp.  The opaque iterator
 *    state pointed at by statep is destroyed and *statep is set to JSVAL_NULL
 *    if there are no properties left to enumerate.
 *
 *  JSENUMERATE_DESTROY
 *    Destroy the opaque iterator state previously allocated in *statep by a
 *    call to this function when enum_op was JSENUMERATE_INIT.
 *
 * The return value is used to indicate success, with a value of JS_FALSE
 * indicating failure.
 */
typedef JSBool
(* JS_DLL_CALLBACK JSNewEnumerateOp)(JSContext *cx, JSObject *obj,
                                     JSIterateOp enum_op,
                                     jsval *statep, jsid *idp);

/*
 * The old-style JSClass.enumerate op should define all lazy properties not
 * yet reflected in obj.
 */
typedef JSBool
(* JS_DLL_CALLBACK JSEnumerateOp)(JSContext *cx, JSObject *obj);

/*
 * Resolve a lazy property named by id in obj by defining it directly in obj.
 * Lazy properties are those reflected from some peer native property space
 * (e.g., the DOM attributes for a given node reflected as obj) on demand.
 *
 * JS looks for a property in an object, and if not found, tries to resolve
 * the given id.  If resolve succeeds, the engine looks again in case resolve
 * defined obj[id].  If no such property exists directly in obj, the process
 * is repeated with obj's prototype, etc.
 *
 * NB: JSNewResolveOp provides a cheaper way to resolve lazy properties.
 */
typedef JSBool
(* JS_DLL_CALLBACK JSResolveOp)(JSContext *cx, JSObject *obj, jsval id);

/*
 * Like JSResolveOp, but flags provide contextual information as follows:
 *
 *  JSRESOLVE_QUALIFIED   a qualified property id: obj.id or obj[id], not id
 *  JSRESOLVE_ASSIGNING   obj[id] is on the left-hand side of an assignment
 *
 * The *objp out parameter, on success, should be null to indicate that id
 * was not resolved; and non-null, referring to obj or one of its prototypes,
 * if id was resolved.
 *
 * This hook instead of JSResolveOp is called via the JSClass.resolve member
 * if JSCLASS_NEW_RESOLVE is set in JSClass.flags.
 *
 * Setting JSCLASS_NEW_RESOLVE and JSCLASS_NEW_RESOLVE_GETS_START further
 * extends this hook by passing in the starting object on the prototype chain
 * via *objp.  Thus a resolve hook implementation may define the property id
 * being resolved in the object in which the id was first sought, rather than
 * in a prototype object whose class led to the resolve hook being called.
 *
 * When using JSCLASS_NEW_RESOLVE_GETS_START, the resolve hook must therefore
 * null *objp to signify "not resolved".  With only JSCLASS_NEW_RESOLVE and no
 * JSCLASS_NEW_RESOLVE_GETS_START, the hook can assume *objp is null on entry.
 * This is not good practice, but enough existing hook implementations count
 * on it that we can't break compatibility by passing the starting object in
 * *objp without a new JSClass flag.
 */
typedef JSBool
(* JS_DLL_CALLBACK JSNewResolveOp)(JSContext *cx, JSObject *obj, jsval id,
                                   uintN flags, JSObject **objp);

/*
 * Convert obj to the given type, returning true with the resulting value in
 * *vp on success, and returning false on error or exception.
 */
typedef JSBool
(* JS_DLL_CALLBACK JSConvertOp)(JSContext *cx, JSObject *obj, JSType type,
                                jsval *vp);

/*
 * Finalize obj, which the garbage collector has determined to be unreachable
 * from other live objects or from GC roots.  Obviously, finalizers must never
 * store a reference to obj.
 */
typedef void
(* JS_DLL_CALLBACK JSFinalizeOp)(JSContext *cx, JSObject *obj);

/*
 * Used by JS_AddExternalStringFinalizer and JS_RemoveExternalStringFinalizer
 * to extend and reduce the set of string types finalized by the GC.
 */
typedef void
(* JS_DLL_CALLBACK JSStringFinalizeOp)(JSContext *cx, JSString *str);

/*
 * The signature for JSClass.getObjectOps, used by JS_NewObject's internals
 * to discover the set of high-level object operations to use for new objects
 * of the given class.  All native objects have a JSClass, which is stored as
 * a private (int-tagged) pointer in obj->slots[JSSLOT_CLASS].  In contrast,
 * all native and host objects have a JSObjectMap at obj->map, which may be
 * shared among a number of objects, and which contains the JSObjectOps *ops
 * pointer used to dispatch object operations from API calls.
 *
 * Thus JSClass (which pre-dates JSObjectOps in the API) provides a low-level
 * interface to class-specific code and data, while JSObjectOps allows for a
 * higher level of operation, which does not use the object's class except to
 * find the class's JSObjectOps struct, by calling clasp->getObjectOps.
 *
 * If this seems backwards, that's because it is!  API compatibility requires
 * a JSClass *clasp parameter to JS_NewObject, etc.  Most host objects do not
 * need to implement the larger JSObjectOps, and can share the common JSScope
 * code and data used by the native (js_ObjectOps, see jsobj.c) ops.
 */
typedef JSObjectOps *
(* JS_DLL_CALLBACK JSGetObjectOps)(JSContext *cx, JSClass *clasp);

/*
 * JSClass.checkAccess type: check whether obj[id] may be accessed per mode,
 * returning false on error/exception, true on success with obj[id]'s last-got
 * value in *vp, and its attributes in *attrsp.  As for JSPropertyOp above, id
 * is either a string or an int jsval.
 *
 * See JSCheckAccessIdOp, below, for the JSObjectOps counterpart, which takes
 * a jsid (a tagged int or aligned, unique identifier pointer) rather than a